Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tobari, Kazuaki
Iwase, Yuta
Taguchi, Yoshiyuki
Abstract
A power conversion device comprising, a power converter that outputs signal to the motor to vary the motor's output frequency, output voltage and output current and control unit that controls the power converter, the control unit is, calculating the first power from the output voltage and output current, calculating the second power from the output current, electrical circuit parameters and frequency estimates, calculating the first phase error estimate so that the first power follows the second power in the first frequency domain, calculating the second phase error estimate different from the first frequency domain in a second frequency domain, controlling the frequency estimates so that the first phase error estimate or the second phase error estimate follows the command value of the phase error estimate.
H02P 21/24 - Vector control not involving the use of rotor position or rotor speed sensors
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Watabe, Yusuke
Saito, Hiroaki
Abstract
A compressor includes: a housing; a compressor body to compress gas; a motor to drive the compressor body; a control board to control the motor; and a tank to store the gas outputted from the compressor body, wherein the housing has: a machine chamber storing the compressor body and the motor; a B-chamber having piping to connect the compressor body with the tank; an A-chamber storing the tank; an A-partition separating the machine chamber from the A-chamber and B-chamber; and a B-partition between the A-chamber and the B-chamber, the A-chamber has an air intake port to introduce ambient air, the A-partition has an A-vent as a hole to communicate between the machine chamber and the A-chamber, and a suction port of the compressor body is located in vicinity to the A-vent.
F04B 41/02 - Pumping installations or systems specially adapted for elastic fluids having reservoirs
F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tokoi, Hirooki
Nakahara, Mizuki
Suzuki, Toshifumi
Amaike, Masaru
Takahashi, Shuuichi
Yoneoka, Yasuei
Sakai, Toru
Abstract
A rotary electric machine (1000) including: a rotor (200); a stator (100) surrounding a periphery of the rotor (200); a first recessed portion (133) disposed in an inner circumferential surface of a back yoke (130) of the stator (100), and extending in an axial direction of the stator (100); and a tooth (120) having one end fitted in the first recessed portion (133), a clearance formed between the first recessed portion (133) and the one end of the tooth (120) fitted in the first recessed portion (133) being smaller in a circumferential direction of the stator (100) than in a radial direction of the stator (100).
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tobari, Kazuaki
Ohashi, Hironori
Watanabe, Hiroshi
Ohya, Masato
Abstract
A power converter apparatus comprising: a power converter that outputs signal to the magnet motor to vary the output frequency, output voltage and output current of the magnet motor, a control unit controls the power converter, wherein the control unit calculating the gain of the magnetic flux component of the q-axis, which varies with the phase of the magnet motor, calculating the d-axis induced voltage command value based on a value of the induced voltage coefficient, frequency estimates or frequency command value, and the gain of the flux component of the q-axis.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Uchiki, Ryosuke
Ikemura, Yuuji
Abstract
A method of updating the program of a gas compressor system that supplies at least one of pressure and flow rate of gas discharged from the discharge piping system based on predetermined values comprising: the management device obtaining an update program, updating a program for an in-service compressor of the plurality of gas compressors whose program is to be updated, and driving other gas compressors of the plurality of gas compressors, which are different from the operating compressor whose program is to be updated, in accordance with the predetermined value.
F04C 28/02 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Zhang, Yu
Takano, Yuuri
Takada, Hideto
Abstract
A electric motor control device comprising a converter section converting AC voltage to DC voltage, an inverter section converting DC voltage from the converter section to AC voltage and supplying said AC voltage to electric motor, an inverter control unit controlling said inverter section, a current detection unit detecting the current flowing in said electric motors and a power calculation unit estimating the temperature of said electric motors from said detected current, calculating the resistance of said electric motors from said estimated temperature, and calculating the copper loss from said calculated resistance.
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Matsubara, Mitsuru
Takano, Yuuri
Uei, Yusuke
Kondo, Terutomo
Yanada, Tetsuo
Tobari, Kazuaki
Abstract
Motor controller device comprising a position control system that controls the position of a machine end connected to a motor, wherein the motor controller device receiving the first speed directive from the high-level controller, stored in the position control system to output a motor axis position response to the high-level controller, comprising speed controller and vibration controller in speed control system, wherein the vibration controller in speed control system comprising: a position command estimator that calculates an estimate of the location directive based on the first speed directive and the motor axis position response, a parallel vibration damping controller that extracts the frequency components that excite vibration of the machine end included in the first speed directive based on the estimated value of the location directive, and outputs the extracted frequency components. The parallel vibration damping controller outputs the extracted frequency components, a phase regulator to improve the response delay caused by the parallel vibration damping controller, a first unit converter that converts the output of the phase regulator into the dimension of velocity, and an arithmetic unit wherein the arithmetic unit, the output of the parallel vibration damping controller is subtracted from the first speed directive to remove from the first speed directive the frequency components that excite vibration at the machine end, and output as a second speed directive, the first real speed directive as an output of the vibration controller in speed control system based on the output of the first unit converter and the second speed directive, uses the first real speed directive as a command for the speed controller.
H02P 23/04 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
H02P 23/18 - Controlling the angular speed together with angular position or phase
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tsuchiya, Takeshi
Chiba, Kotaro
Nagata, Shuhei
Yorikane, Shigeyuki
Morita, Kenji
Kajie, Yuta
Abstract
A screw compressor for compressing a working medium sucked through a suction opening and discharging the compressed working medium through a delivery opening, wherein the screw compressor includes: a male rotor and a female rotor that rotate while meshing with each other; a casing that houses the male rotor and the female rotor and is provided with a bore which forms a working chamber designed, together with the male rotor and the female rotor, to compress the working medium; a drive unit that rotationally drives at least one of the male rotor and the female rotor; a working chamber closing unit that forms a suction port for sucking the working medium into the working chamber and closes the working chamber when the working chamber reaches a specified capacity; and a suction space that connects the suction opening and the suction port to allow communication therebetween, wherein an open space that connects the suction opening and the suction port to allow communication therebetween is provided between a shaft of the male rotor and a shaft of the female rotor on an opposite side of the male rotor and the female rotor relative to the suction port.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Uei, Yusuke
Kondo, Terutomo
Takano, Yuuri
Yanada, Tetsuo
Takada, Hideto
Abstract
A motor control device that supplies electric power to a motor is disclosed. The motor control device is provided with a storage unit to store position offset data and information of a machine origin position of the motor. The motor control device generates a command value of a position after offset by using an externally input position command and the position offset data and coverts electric power to be supplied to the motor based on the command value of a position after offset and position information that is input from an encoder. The position offset data is data in which offset positions and offset quantities have been recorded in a mapping relation. A start position of the offset positions differs from the machine origin position.
G05B 19/404 - Numerical control (NC), i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Fujisawa, Yukinari
Kawashima, Takuya
Abstract
Rotating electrical machine comprising: a housing storing a stator and a rotor, a fan cover covers the housing from the outside, an end bracket attached to the axial end face of the housing, a cooling fan installed in the fan cover, wherein output shaft side end face of the fan cover has a convex portion extending in the axial direction, the end bracket on the output shaft side has a concave first exhaust opening part relative to the convex part of the fan cover, the end bracket on the anti-output shaft side has a second exhaust opening part on the opposite side of the first exhaust opening part.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 5/20 - Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Chiba, Kotaro
Takano, Masahiko
Yorikane, Shigeyuki
Morita, Kenji
Kajie, Yuta
Abstract
A casing of a screw compressor has a delivery inner wall face facing delivery end faces of a male rotor and a female rotor. The delivery inner wall face of the casing has a shield area that shields at least a part of a track of an axial fluid communication path, which is a clearance that periodically occurs at the delivery end faces according to variation of intermeshing of the male and female rotors upon rotation thereof and is bounded by trailing flanks of the male and female rotors. The shield area of the casing is provided with a groove group made up of a plurality of grooves having longitudinal directions. The grooves of the groove group are juxtaposed in the circumferential direction of at least one rotor of the male and female rotors and are arranged such that their sides extending in the longitudinal directions are disposed adjacent to each other. Each groove of the groove group is configured such that its longitudinal direction oriented from the inner circumferential side of the one rotor toward the outer circumferential side is inclined with respect to the radial direction of the one rotor in the same direction as the rotational direction of the one rotor.
F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kisanuki, Shoichiro
Kato, Manabu
Sato, Koma
Sugii, Taisuke
Abstract
A novel inkjet recording device that allows occurrence of scattering to be suppressed without limiting the size of a printed character (font size) is provided. The novel inkjet recording device is so configured that a deflection positive electrode, a deflection negative electrode, or both the deflection positive electrode and the deflection negative electrode constituting a print head can be moved along a direction of ejection of ink droplets in correspondence with the size of a printed character.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yamada, Hiroki
Fujioka, Takayoshi
Kihara, Hajime
Abstract
This information processing device for executing applications holds, for each of the applications, a manifest file (user interface definition file) in which a user interface for the application is defined. The manifest file is designated with an attribute of data type for each item for defining a user interface object through which a setting item of the application is inputted/outputted. The information processing device generates the user interface object at which setting of the application is performed on the basis of the manifest file. Accordingly, for each of the applications, the user interface regarding setting of the application is unified, operability of a user is improved, and development efficiency of an application developer is improved.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Ren, Zhijia
Aoyagi, Norio
Abstract
A gas compression system that can continue control of the number of operated pieces of a compressor even when an abnormality has occurred and a control method thereof are provided. The gas compression system includes compressors, a number-of-pieces controller that executes master control to control the number of operated pieces of the compressor, and a communication network that connects the compressors and the number-of-pieces controller with each other in a mutually communicable manner. Each compressor includes a compressor main unit that compresses a gas and a controller that executes slave control to control the compressor main unit in response to a command from the number-of-pieces controller. The respective controllers are configured to determine whether an abnormality of the number-of-pieces controller or an abnormality of communication with the number-of-pieces controller has occurred on the basis of whether a safety notification from the number-of-pieces controller is received and transmit a master declaration.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
A laminar flow at a high air speed can be maintained, and contamination caused by operation of a device or operation of the device by a person can be suppressed as much as possible. There is provided a safety cabinet that supplies clean air into a work room from above, the cabinet including: an opening portion in a front surface of the work room; a front shutter; partition plates provided on right and left side surfaces and a back surface on an upper side of the work room; and a partition on a front upper side of the work room.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Ojima, Masayoshi
Yamazaki, Masahiro
Sato, Kenji
Kobayashi, Yutaka
Gotou, Hideyuki
Abstract
A data analysis unit includes a validity determination unit that calculates a determination factor for determining the validity of a data analysis process to determine the validity of the data analysis process, and displays the validity determination result on a display device.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Arima, Takahiro
Mizoguchi, Sho
Miyao, Akira
Ueda, Fumiomi
Okano, Mamoru
Abstract
An inkjet recording device includes a main body unit, a print head unit, and a head mounting unit. The main body unit includes an ink container. The print head unit includes a nozzle connected to the ink container. The head mounting unit is configured to allow the print head unit to be mounted on the head mounting unit. The head mounting unit includes a head detection unit that detects whether or not the print head unit is mounted, using a magnetic force.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tsuchiya, Takeshi
Chiba, Kotaro
Komatsu, Tomohiro
Tanimoto, Shota
Yabe, Toshiaki
Yorikane, Shigeyuki
Abstract
In a screw compressor, a lobe profile of cross-sections perpendicular to the axial direction in a female rotor that rotates about a second rotation center changes in the axial direction. One lobe of the lobe profile of the female rotor includes: a first contour line defining a leading flank on a rotation direction side of the female rotor with a lobe bottom as a boundary point; a second contour line defining a trailing flank on an opposite side of the rotation direction; and a third contour line defining a lobe tip having both endpoints at which the female has the maximum radius. In the lobe profile of the female rotor, when a first angle, a second angle, and a third angle are respectively defined as an angle formed by two line segments linking a second rotation center as a vertex and both ends of the first contour line, an angle formed by two line segments linking the second rotation center and both ends of the second contour line, and an angle formed by two line segments linking the second rotation center and both ends of the third contour line, the third angle is greater on the delivery side in the axial direction, and the first angle is smaller on the delivery side in the axial direction.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Arima, Takahiro
Okamoto, Yusuke
Mizoguchi, Sho
Miyao, Akira
Matsumoto, Tatsuo
Abstract
An object of the present invention is to reduce the amount of solvent vapor floating around when a print head is cleaned in an inkjet recording device. In addition, an object is to reduce ink stains on a periphery of the print head. An inkjet recording device includes a main body portion and a print head. The main body portion includes an ink container that contains ink, and a solvent container that contains a solvent. The print head includes a nozzle connected to the ink container to discharge the pressurized and supplied ink, a charging electrode that charges ink particles discharged from the nozzle, a deflection electrode that deflects the ink particles charged by the charging electrode, and a gutter that collects the ink. In addition, a head mounting unit for cleaning the print head is provided. The head mounting unit is connected to a solvent vapor suction path for suctioning solvent vapor generated therearound.
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Yorikane, Shigeyuki
Morita, Kenji
Kajie, Yuta
Abstract
A gas compressor inhibits a supply delay of a compressed gas at a time of a return from no-load operation to load operation, and also reduces the consumed motive power. A controller switches between load operation and no-load operation by controlling a suction throttle valve according to a sensed delivery-side pressure, and also controls a rotation speed of an electric motor that drives the compressor. The controller is configured to compute a capacity C of an air supply system that supplies a compressed air generated by the air compressor to a use location of the compressed gas on a basis of load operation duration t1 and no-load operation duration t2, and set a target rotation speed of the electric motor at a time of no-load operation on a basis of the capacity C of the air supply system.
F04B 49/20 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by changing the driving speed
F04C 28/26 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves using bypass channels
F04C 28/08 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
Hitachi Industrial Equipent Systems Co., Ltd. (Japan)
Inventor
Yamaguchi, Shoki
Arima, Takahiro
Mizoguchi, Sho
Okano, Mamoru
Miyao, Akira
Abstract
An inkjet recording device having a print head cleaning function of preventing a cleaning liquid from spilling around the inkjet recording device and storing the cleaning liquid used for cleaning in a highly airtight container. The inkjet recording device includes a main body including an ink container accommodating an ink used to perform printing on a print target, and a cleaning liquid container that accommodates a cleaning liquid; a print head including a nozzle that is connected to the ink container to discharge the ink which is pressurized and supplied, a charging electrode that charges ink particles, a deflection electrode that deflects the ink particles charged by the charging electrode, and a gutter that recovers the ink particles which are not used for the printing; and a head cleaning unit including a cleaning nozzle that discharges the cleaning liquid, and an insertion port into which the print head is insertable.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yorikane, Shigeyuki
Morita, Kenji
Kajie, Yuta
Abstract
Provided is an oil feed type air compressor which can increase the determination accuracy regarding a deterioration state of oil. An oil feed type air compressor 1 includes a compressor main body 3, a separator 6 that separates oil from compressed air discharged from the compressor main body 3, and an oil feeding system 8 that feeds the oil separated by the separator 6 into a compression chamber of the compressor main body 3. The oil feeding system 8 includes a temperature control valve 20 that adjusts a diversion ratio for an oil cooler 18 and a diversion ratio for a bypass pipe 19 according to a temperature of the oil. The oil feed type air compressor 1 includes pressure sensors 22A and 22B located in the oil feeding system 8, a discharge temperature sensor 11 located on the discharge side of the compressor main body 3, and a controller 9 that computes, when it is estimated that the diversion ratio for the oil cooler 18 is 100% from the temperature sensed by the discharge temperature sensor 11 exceeding a predetermined value Td1, a difference ΔP between the pressure sensed by the pressure sensor 22A and the pressure sensed by the pressure sensor 22B and determines a deterioration state of the oil in reference to the difference ΔP.
F04D 29/063 - Lubrication specially adapted for elastic fluid pumps
F16N 29/00 - Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
F04D 27/00 - Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Morita, Kenji
Yorikane, Shigeyuki
Kajie, Yuta
Abstract
An oil feed type air compressor includes a compressor main body, a separator that separates the oil from the compressed air delivered from the compressor main body, and an oil feed system that supplies the oil to the working chambers and bearings of the compressor main body. The oil feed system includes an oil cooler that includes a cooling unit and a cooling unit connected on a downstream side of the cooling unit, an oil feed pipe that is connected to an outlet between the cooling unit and the cooling unit and that supplies the oil cooled by the cooling unit to the bearings of the compressor main body, and an oil feed pipe that is connected to an outlet on a downstream side of the cooling unit and that supplies the oil cooled by the cooling units to the working chambers of the compressor main body.
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Yamamoto, Kentaro
Kado, Tomoyuki
Abstract
A packaged compressor with enhanced electric motor coolability includes an electric motor having an axial direction that lies in a horizontal direction; a compressor body; a housing that houses the electric motor and the compressor body; a cooling air inlet formed through a side surface of the housing; a cooling air outlet formed through an upper surface of the housing; and a cooling fan arranged on a side of the electric motor such that an axial direction of the cooling fan lies in a horizontal direction and crosses the axial direction of the electric motor. The cooling fan has a diameter greater than the height dimension of the electric motor and it's its axial-direction projection plane includes a portion overlapping the electric motor, a portion positioned above the electric motor and not overlapping the electric motor, and a portion positioned below the electric motor and not overlapping the electric motor.
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Ishizuka, Yuki
Itou, Yuuji
Abstract
A package-type compressor is provided which reduces the leakage of noise generated by a heat exchanger without suppressing the flow rate of cooling air to an electric motor.
A package-type compressor is provided which reduces the leakage of noise generated by a heat exchanger without suppressing the flow rate of cooling air to an electric motor.
The package-type compressor includes a cooling fan 12 that induces a flow of cooling air, an inlet duct 15A that introduces the cooling air from a cooling air inlet 13A to heat exchangers 3 to 6, a plurality of louvers 16 disposed in the inside of the inlet duct 15A, and another inlet duct 15B that introduces the cooling air from another cooling air inlet 13B to an electric motor 1. The cooling air inlet 13A is disposed such that the position thereof in the vertical direction is same as that of the heat exchangers 3 to 6. Each of the louvers 16 has a linear portion 19A that extends in a direction perpendicular to the cooling air passage surface of the heat exchangers 3 to 6 such that it is inclined to the upper side toward the heat exchangers 3 to 6 and another linear portion 19B that extends in a direction diagonal to the cooling air inlet 13A such that it is inclined to the upper side toward the cooling air inlet 13A.
F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Itou, Yuuji
Yabe, Toshiaki
Sakai, Kohei
Nakajima, Takashi
Abstract
Provided is an air compressor that suppresses a rise in delivery temperature due to a change in atmospheric pressure, and consequently improves the life of parts. The air compressor 1 includes a motor 2, a compressor main body 3 driven by the motor 2 to compress air, a delivery pressure sensor 12 that senses a delivery pressure of the compressor main body 3, an atmospheric pressure sensor 13 that senses an atmospheric pressure, and a controller 15. The controller 15 compares the delivery pressure sensed by the delivery pressure sensor 12 with a set pressure, and performs operation control based on a result of the comparison. The controller 15 corrects the set pressure such that a ratio between the atmospheric pressure sensed by the atmospheric pressure sensor 13 and the set pressure becomes a set value set in advance.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tobari, Kazuaki
Onuma, Yusaku
Sugimoto, Takuya
Watanabe, Hiroshi
Tokashiki, Mutsuo
Abstract
The present invention achieves highly accurate control characteristics by estimating an induced voltage coefficient of a magnet motor without rotary auto-tuning.
The present invention achieves highly accurate control characteristics by estimating an induced voltage coefficient of a magnet motor without rotary auto-tuning.
A first power Pc is calculated on the basis of the output voltage and output current of the magnet motor, and a second power Pc{circumflex over ( )} is calculated on the basis of the electric circuit constant, current command, output frequency, and induced voltage coefficient of the magnet motor. The induced voltage coefficient is estimated so that the calculated first power follows the second power, and the driving of the magnet motor is controlled in accordance with the induced voltage coefficient.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Sato, Fumihiro
Tanabe, Keisuke
Takata, Naoki
Matsumoto, Daisuke
Yagihara, Shigetoshi
Hiraga, Masahiro
Abstract
With the aim of improving the reliability of a power conversion device for driving a motor, this power conversion device is provided with a rectifying portion for rectifying an AC voltage and outputting a DC voltage, a smoothing capacitor for smoothing the DC voltage, an inverter portion into which the DC voltage is input and which outputs AC power, an inverter drive portion for outputting a gate signal to the inverter portion, a regenerative braking portion connected in parallel with the smoothing capacitor, a regenerative braking drive portion for outputting a gate signal to the regenerative braking portion, a control portion for outputting drive signals to the inverter drive portion and the regenerative braking drive portion, a regenerative braking overcurrent detecting portion for outputting an overcurrent detection signal if the current flowing through the regenerative braking portion exceeds a determination value, and a latch portion into which the overcurrent detection signal output from the regenerative braking overcurrent detecting portion is input and which outputs a gate output interruption signal to the control portion, wherein switching elements of the inverter portion and the regenerative braking portion stop in an off state when the regenerative braking overcurrent detection portion detects an overcurrent.
H02P 3/22 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Chen, Huilin
Takahashi, Takahiro
Abstract
A network environment is built in an already-existing production line without significant cost to provide a novel and user-friendly inkjet printer system. A portable repeater 3 includes a carriageable storage unit and is interposed between an inkjet printer 6 and a server 5. The inkjet printer 6 and the repeater 3 are communicated with other over short-range wireless 2 to transmit print related data from the inkjet printer 6 to the repeater 3 or from the repeater 3 to the inkjet printer 6, and the repeater 3 and the server 5 are communicated with each other over a communication network 4 to transmit the print related data either from the server 5 to the repeater 3 or from the repeater 3 to the server 5. This enables building of the network environment in an already-existing production line without significant cost.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Matsumoto, Daisuke
Tanabe, Keisuke
Hotta, Kazushige
Sato, Fumihiro
Hiraga, Masahiro
Abstract
Provided are a power conversion device and a remote monitoring system capable of calculating the life of a power semiconductor device with high accuracy. In order to achieve the above purpose, a power conversion device, which controls the flow or interruption of a current with an inverter having a power semiconductor device and performs desired power conversion, comprises: a motor control unit which calculates a gate signal on the basis of a current value, a speed command, and a carrier frequency detected by a current sensor and controls the inverter; a temperature history calculator which estimates the loss of the power semiconductor device and calculates a temperature history; a temperature history storage device which stores the calculation result of the temperature history; and a damage calculator which calculates damage to the power semiconductor device from the temperature history read from the temperature history storage device.
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02M 7/539 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
H02P 29/68 - Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Mikoshiba, Ryousuke
Tanaka, Masaya
Shinohara, Makoto
Abstract
There is provided a transformer (101) in which deformation of a coil (403, 503, 603) caused by a short-circuit electromagnetic mechanical force can be suppressed by using a coil pressing metal fitting (303, 401, 501, 601) that saves space and that is lightweight.
There is provided a transformer (101) in which deformation of a coil (403, 503, 603) caused by a short-circuit electromagnetic mechanical force can be suppressed by using a coil pressing metal fitting (303, 401, 501, 601) that saves space and that is lightweight.
A coil pressing metal fitting (303, 401, 501, 601) includes a coil pressing metal fitting base member (201, 301) that comes into contact with a coil (403, 503, 603), and a reinforcement member (302) disposed outside the coil pressing metal fitting base member (201, 301). The reinforcement member (302) is connected and fixed to the coil pressing metal fitting base member (201, 301) by a joining member from inside the coil pressing metal fitting base member (201, 301) through the hole (202, 204) of the coil pressing metal fitting base member (201, 301).
H01F 27/30 - Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kobayashi, Chie
Kurita, Naoyuki
Sato, Kohei
Takahashi, Toshiaki
Nakashima, Hikaru
Abstract
There is provided a static induction electric apparatus capable of improving smoothnesses of magnetic flux distributions inside iron cores. A stationary induction electric apparatus including wound iron cores and a winding, wherein each of the wound iron cores is a laminated body of magnetic materials that are lap-joined and at least provided with a step lap joint portion on an inner peripheral side of the wound iron core, and gap distances between ends of the step lap joint potion are gradually shortened toward an outer peripheral side of the wound iron core. Although a configuration of the stationary induction electric apparatus is simple, the stationary induction electric apparatus having improved smoothnesses of magnetic flux distributions inside the iron cores can be provided.
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
33.
Power Conversion Device and Metal Processing Device
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Nakahara, Mizuki
Tokoi, Hirooki
Ikeda, Kenji
Abstract
A power conversion device capable of shortening the time required for acceleration of a motor and a metal processing device including the power conversion device are provided. Then, a power conversion device 10 includes a converter 100 configured to convert an AC voltage from outside to a DC voltage Vo and a converter controller 107 configured to control the converter 100. The converter 100 includes a voltage doubler circuit 104 configured to boost the DC voltage Vo when activated, and outputs the DC voltage Vo having a voltage value different in accordance with the activation and stop of the voltage doubler circuit 104. The converter controller 107 activates the voltage doubler circuit 104 at a first time that is earlier by a predetermined period than a second time at which a speed command value ω* of the motor 130 rises from a predetermined value.
H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
H02M 3/158 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
H02M 7/06 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yamazaki, Shumpei
Kanemoto, Yoshiyuki
Kato, Fuminori
Abstract
Provided is a motor-integrated fluid machine that has improved performance and reliability by efficiently cooling a fluid machine body and a motor without increasing an installation space. The present invention is characterized by being provided with: a fluid machine unit that compresses or expands a fluid; a motor unit that has a drive shaft connected to the fluid machine unit; and a cooling fan that cools the motor unit and the fluid machine unit by sucking cooling air from the motor unit side and that is connected to the drive shaft at the side opposed to that connected to the fluid machine unit, wherein between the motor unit and the cooling fan, the minimum sectional area of a cooling air passage from the outside in the radial direction toward the drive shaft is larger than that of a cooling air passage from the motor unit side toward the cooling fan.
F04B 39/06 - Cooling; Heating; Prevention of freezing
F04C 2/04 - Rotary-piston machines or pumps of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents of internal-axis type
35.
Monitoring System, Monitoring Apparatus, and Monitoring Method
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kono, Masashi
Nakagawa, Yuusuke
Honjo, Hidetoshi
Kimura, Kenji
Abstract
A monitoring apparatus includes: an input unit that accepts equipment identifying information for identifying monitoring object equipment and an analysis purpose; and an output unit that, when analysis item data corresponding to the analysis purpose among operation data indicating an operating status of the identified monitoring object equipment is a value within a specified range on the basis of the equipment identifying information and the analysis purpose which have been input, outputs a tendency of the analysis item data compared with predetermined comparison item data. According to the above-described configuration, the status of the monitoring object equipment can be diagnosed and visualized for the sake of the condition based maintenance to perform maintenance in accordance with the status of each equipment.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Sato, Fumihiro
Tanabe, Keisuke
Hamano, Koji
Tomiyama, Kiyotaka
Miyazaki, Hiroyoshi
Abstract
Provided is a power conversion device which comprises a main circuit board, a first board, and a second board and which has a reduced size. The main circuit board has a rectifier circuit and an inverter circuit which are disposed in a high-power section, the rectifier circuit rectifying AC voltage and The second board is provided with a The first board is connected to the main circuit board and to the second board, and is provided with: a first circuit disposed in a low-power section. The second board is provided with a second circuit disposed in a low-power section. section from each other in a reinforced manner; an insulating transformer disposed in the reinforced insulation region and constituting a constituent component of a power supply circuit for receiving the DC voltage and supplying power to the first circuit and to the second circuit; and an insulating element disposed in the reinforced insulation region and allowing a signal to be exchanged between the first circuit and the second circuit.
H02M 7/00 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Okamoto, Yusuke
Arima, Takahiro
Mizoguchi, Sho
Miyao, Akira
Matsumoto, Tatsuo
Abstract
The present invention provides an inkjet recording device capable of automatically cleaning the head tip and a cleaning method for inkjet recording apparatus.
The present invention provides an inkjet recording device capable of automatically cleaning the head tip and a cleaning method for inkjet recording apparatus.
An inkjet recording apparatus has a printhead that receives a supply of ink and prints, a main unit that supplies said ink to said printhead, and a cleaning unit that has a cleaning tank into which said entire printhead is inserted and injects a cleaning solution from a cleaning nozzle to said printhead for cleaning. The cleaning unit has a cleaning nozzle that sprays cleaning liquid into the cleaning tank and a cleaning base section that has a housing section that accommodates the tip of the printhead and allows said cleaning liquid to flow into the housing section. The cleaning liquid is allowed to flow into the housing section to clean the tip of the printhead.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Onuma, Yusaku
Sugimoto, Takuya
Abstract
The purpose of the present invention is to provide a power conversion device capable of suppressing an increase in current flowing through a motor even if a voltage command exceeds the amplitude of a carrier wave. To achieve the above purpose, a power conversion device, which controls the drive of a three-phase motor by converting a DC voltage into a voltage command-based voltage through the operation of a switching circuit, comprises: a DC voltage detector which detects a DC voltage; a norm generator which generates a voltage command norm from the voltage command; a modulated wave generator which generates a first modulated wave from the detected DC voltage and the voltage command norm; and a control signal generator which generates a control signal for controlling the operation of the switching circuit from the first modulated wave and the carrier wave, wherein the modulated wave generator generates, for one phase at the timing of the maximum or minimum value of the voltage command, a first modulated wave having a magnitude of 1/2 of the detected DC voltage, and generates, for the remaining two phases, a first modulated wave having a magnitude based on the detected DC voltage and voltage command norm.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
H02M 7/537 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Suzuki, Kouga
Yamamoto, Toshihiko
Abstract
This power conversion device has: a main breaker and a main electromagnetic contactor connected to a main power supply; a converter body having a switching element; a power supply-side reactor and a device body-side reactor connected to the main electromagnetic contactor; a current detector; a smoothing capacitor; a DC voltage detector that detects a voltage of the smoothing capacitor; a control unit; and accessories. The accessories have: a power-supply phase detection transformer that detects the phase and the amplitude of a power supply voltage; a current limiting resistor that suppresses rush current to the smoothing capacitor at an initial turning-on stage of the main power supply; an electromagnetic contactor which is for turning on current limiting operation and which connects the current limiting resistor and the main power supply; and a filter circuit that removes current ripples caused by switching of the switching element. The main breaker, the main electromagnetic contactor, and an input terminal of the power-supply phase detection transformer in the accessories are connected to one another. The power supply-side reactor, the device body-side reactor, and a filter terminal in the accessories are connected to one another.
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
H02M 1/36 - Means for starting or stopping converters
H02M 1/14 - Arrangements for reducing ripples from dc input or output
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Onodera, Tasuku
Kobayashi, Yoshio
Abstract
Provided is a compressor including a sliding material with the wear resistance improved. To solve this problem, a compressor (40) includes: a compression chamber (43) that is formed in a cylinder (41) and compresses gas; and a piston ring 421 and a rider ring 422 that are in contact with the inner wall of the cylinder 41 to form the compression chamber (43). The piston ring 421 and rider ring 422 include: a resin member; and a metal particle that is located within the resin member and includes a surface layer containing an affinity portion having an affinity to the resin member.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F16J 9/26 - Piston-rings, seats therefor; Ring sealings of similar construction in general characterised by the use of particular materials
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Otowa, Takuya
Sasaki, Hiroshi
Suzuki, Tatsunosuke
Ogino, Masahiko
Abstract
This invention provides an ink for inkjet printers with both properties; i.e., good visibility of printing dots after heating and high dissolution stability. The ink for inkjet printers of the invention comprises a color material, a solvent, and resin, wherein the color material comprises a first metal complex and a second metal complex comprising metal ions selected from among iron ions, manganese ions, copper ions, cobalt ions, and chromium ions and ligands bound thereto, and the ligands comprise diketone structures incorporated in the chemical structures thereof.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Chiba, Kotaro
Yorikane, Shigeyuki
Takano, Masahiko
Morita, Kenji
Abstract
A liquid supply type screw compressor that can suppress a rise in temperature of a liquid while reducing work for stirring the liquid is provided. The liquid supply type screw compressor has a male rotor 11A and a female rotor 11B, male-rotor-side working chambers formed at grooves of the male rotor 11A, and female-rotor-side working chambers formed at grooves of the female rotor 11B. In addition, the liquid supply type screw compressor has: a liquid supply nozzle 28 that is arranged on one side in the rotor axial direction which is a low-pressure side of an intersection P at which a high-pressure-side cusp 23 intersects a ridge line L of a trailing lobe tip of the female rotor 11B that defines a female-rotor-side working chamber V5 immediately after a start of delivery, the liquid supply nozzle 28 supplying the liquid to the male-rotor-side working chamber; and a liquid supply nozzle 29 that is arranged on the other side in the rotor axial direction which is a high-pressure side of the intersection P, and supplies the liquid to the male-rotor-side working chamber, and the liquid supply amount of the liquid supply nozzle 29 is made greater than the liquid supply amount of the liquid supply nozzle 28.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Adachi, Haruhiko
Kaneko, Takeshi
Abstract
A housing configuration includes a filter chamber having a purifying filter, a rear chamber in the back, and a fan chamber having a fan. In this housing configuration, a measurement port for purifying filter performance evaluation is provided in a substantially middle portion of the rear chamber, and a connecting portion connected to the measurement port and a cover for maintenance work are provided on the front surface of the housing. Provided as a result is an air purifying negative pressure device that is compact in configuration, can be installed with ease, and is capable of improving both the accuracy of an air purifying filter performance evaluation test and the workability of routine maintenance.
F24F 8/108 - Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Kado, Tomoyuki
Yamamoto, Kentaro
Abstract
In the operation of a refueling screw compressor, when load conditions constantly fluctuate or when the rotation speed control of a cooling fan is performed, it is difficult to accurately perform a diagnosis predicted from measurement results of devices inside the compressor, so a diagnostic mode stably creates an operating condition under which an accurate diagnosis can be performed. In the refueling screw compressor, a discharge electric valve is provided downstream of an air cooler, and an air release electric valve and a dedicated orifice are provided to connect an oil separator inner space and a suction throttle valve space. In the diagnostic mode, the discharge electric valve is closed, the air release electric valve is opened, and while an upstream pressure of the oil separator is maintained at a specified pressure, a rotation speed control operation of a compressor body and the diagnosis of internal devices are performed.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Matsubara, Mitsuru
Tobari, Kazuaki
Takano, Yuuri
Uei, Yusuke
Yanada, Tetsuo
Ohashi, Hironori
Abstract
This motor control device receives a speed command from an upper layer system control device having a position controller, the motor control device having: a position command estimator that calculates an estimate of a position command on the basis of the speed command and a motor axis position response; and a speed command generator that generates an actual speed command on the basis of the estimate so that an end section of a machine connected to the motor does not oscillate, wherein the actual speed command is output from the speed command generator to a speed controller.
H02P 23/04 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
46.
Scroll compressor with inclined wall surface extending from the dust wrap
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Watabe, Yusuke
Kanemoto, Yoshiyuki
Kobayashi, Yoshio
Saito, Hiroaki
Abstract
Provided is a scroll compressor that can prevent liquid from being accumulated, the scroll compressor including: a fixed scroll; an orbiting scroll; and a rotation shaft that extends in the horizontal direction and causes the orbiting scroll to orbit relative to the fixed scroll. Liquid is injected into a working chamber. An enclosing point of a working chamber formed near the outer end of a fixed wrap of the fixed scroll is positioned below a center of the rotation shaft and at the lowest point of the contour of the working chamber having shifted to the lowest position. The fixed scroll has an inclined wall surface that is positioned below the center of the rotation shaft, is made to face upward, and extends from the dust wrap to the outer end of the fixed wrap. The inclined wall surface is formed so as to be sloped down gradually from the dust wrap toward the outer end of the fixed wrap.
F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yamada, Hiroki
Nakano, Ryo
Fujiwara, Ryosuke
Shirane, Kazuto
Abstract
It is provided a communication device which transfers a signal, comprising: an arithmetic device configured to execute predetermined processing; a storage device accessible from the arithmetic device; a log collection module configured to collect first type logs from at least one of the communication device or an equipment coupled to the communication device; an alert generation module configured to generate alert when one of the collected the first type logs satisfies a predetermined condition; and a failure cause candidate determination module configured to determine failure cause candidates in response to the generated alert, and output, to the log collection module, an additional log collection request for collecting second type logs in an additional log collection order that is set based on the determined failure cause candidates.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kobayashi, Yoshio
Yamazaki, Shumpei
Watanabe, Sho
Abstract
A scroll type gas machine that can suppress wear of tip seals is provided. The scroll type compressor includes: a fixed scroll 11 having a helical wrap 16; an orbiting scroll 12 having a helical wrap 21; a drive shaft 13 that causes the orbiting scroll 12 to orbit relative to the fixed scroll 11; and a helical tip seal 29A inserted into a seal groove 28A of the wrap 21. The tip seal 29A has: a groove 36A that has an opening at a central portion of a sliding surface 30 in the seal width direction; and a communication groove 37A that establishes communication between the inside of the groove 36A and a working chamber SH on the inner side in the wrap width direction. The groove 36A is provided in a range where the differential pressure (PH−PL) is equal to or higher than 0.1 Mpa between the working chamber SH on the inner side in the wrap width direction and a working chamber SL on the outer side in the wrap width direction. The communication groove 37A is shorter than the groove 36A in the seal extension direction.
F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
49.
DEVICE AND METHOD FOR ASSISTING IN ASSIGNING COMPRESSOR CONTROLLER SETTINGS VALUES, AND COMPRESSOR OPERATION CONTROL SYSTEM
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kim, Eunkyeong
Yashiki, Tatsurou
Tottori, Nobuhiro
Abstract
A device for assisting in assigning setting values of a compressor operation controller for starting or stopping one or more compressors, collecting discharged air of the compressors in an air tank, and supplying the air tank as a compressed air source in a predetermined pressure range, includes: an input unit that receives piping network information which is an element of a pressure loss of a piping flow from the compressor to a pressure control position of the controller, compressor specifications which are an upper limit of a discharge pressure of the compressor and a number of compressor starts/stops, a supply flow rate condition which is time change data of a flow rate flowing from the pressure control position of the controller, and a supply pressure condition which is a lower limit of the supply pressure at the pressure control position of the controller.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Uei, Yusuke
Ishigaki, Takuya
Takada, Hideto
Matsumoto, Yutaka
Sugiura, Masaki
Abstract
A power conversion system 200 includes a power conversion device 2 configured to supply electric power to a motor 3 and a power supply device 1 configured to supply electric power to the power conversion device 2. The power conversion device 2 includes a reverse converter 7 configured to convert the electric power, a control circuit 8 configured to control the reverse converter 7, and a current detector configured to detect a current flowing through the reverse converter 7. The power supply device 1 includes a storage device 6 configured to store electric power in accordance with a voltage, a step-up/down power supply circuit 5 configured to change the voltage of the storage device 6 based on a voltage command, and a voltage command computing circuit 15 configured to compute the energy stored in the storage device 6 and output it as the voltage command to the step-up/down power supply circuit 5. The control circuit 8 calculates powered drive energy of the motor 3 by using information from the motor 3 and a current value detected by the current detector. The voltage command computing circuit 15 computes the energy stored in the storage device 6 based on the powered drive energy calculated by the control circuit 8. When it is determined that the characteristics of the motor 3 are restricted, the voltage command computing circuit 15 temporarily changes the voltage command to improve the motor characteristics.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
A fine particle measuring device performing fine particle measurement includes a particle probe, a pipe connected to the particle probe, and a particle counter connected to the pipe. A cylindrical pipe is disposed on an outer periphery of the pipe and an air flow path is provided between the pipe and the cylindrical pipe.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kohiyama, Tomohisa
Fujioka, Takayoshi
Tobisawa, Naoya
Abstract
A communication module includes a plurality of communication interfaces that support a plurality of different types of communication interface standards to implement a general-purpose communication module that enables data communication not depending on types of equipment. A plurality of programs to be executed in the communication module include a first app to be executed on an OS (Operating System) and one or a plurality of second apps to be executed on the OS. Each of one or more second apps is an app that performs communication in accordance with one or more types of communication protocol on one or more communication interface standards and is an app that can be arbitrarily installed and arbitrarily uninstalled. The first app is an app as middleware between the OS and the one or the plurality of second apps.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tsuchiya, Takeshi
Chiba, Kotaro
Takano, Masahiko
Yorikane, Shigeyuki
Morita, Kenji
Abstract
A delivery port of a rotary-screw compressor includes a first opening having a profile configured to interrupt communication with a second working chamber of a suction process that opens only in the axial direction; a second opening connected to the first opening; and a third opening connected to the first and second openings. The profile of the first opening includes a first profile line that forms one of a pair of lateral edges of a lingulate protrusion; a second profile line that forms another one of the pair of the lateral edges of the protrusion; a third profile line that extends toward the reference point along the root circle of the female rotor; and a second connection line that connects the first and second profile lines. The second opening opens into the first opening at the second connection line. The third opening opens into the first groove.
F01C 1/16 - Rotary-piston machines or engines of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 29/12 - Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 18/20 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with dissimilar tooth forms
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Nakahara, Mizuki
Tokoi, Hirooki
Furukawa, Kimihisa
Kawaguchi, Yuki
Abstract
A power conversion device and a press apparatus capable of preventing an excessive current in a DC-link capacitor are provided. The power conversion device 10 includes a voltage-doubling rectifier circuit 12. In the voltage-doubling rectifier circuit 12, in a voltage-doubling rectification mode, a common connection node Nc between two capacitors 102a and 102b is connected to a predetermined node. A current detector circuit 107 detects a switching current (IL) flowing in the switching elements SW1 and SW2, and a current detector circuit 108 detects a load current Ild of a load 15. In a mode switching period from a full-wave rectification mode to a voltage-doubling rectification mode, a controller circuit 110 controls the switching of the switching elements SW1 and SW2, based on the switching current (IL) and the load current Ild.
H02M 7/25 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in series, e.g. for multiplication of voltage
H02M 5/44 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
B30B 15/14 - Control arrangements for mechanically-driven presses
B30B 15/00 - PRESSES IN GENERAL; PRESSES NOT OTHERWISE PROVIDED FOR - Details of, or accessories for, presses; Auxiliary measures in connection with pressing
B21D 37/00 - Tools as parts of machines covered by this subclass
55.
ELECTRIC POWER CONVERSION DEVICE, SYSTEM USING SAME, AND DIAGNOSTIC METHOD FOR SAME
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Maki, Kohji
Abstract
An electric power conversion device has a function of detecting, at low cost and at an early stage, a sign of insulation failure of a transformer or a rotational machine. This electric power conversion device is provided with an inverter circuit and a PWM signal generation unit that makes a comparison between a carrier signal and a voltage command value and generates a PWM signal for driving the inverter circuit. The electric power conversion device feeds and receives electric power through connection to a transformer or a rotational machine provided with a winding wire. The electric power conversion device is provided with: a current sensor that detects a current to be fed to or received from the transformer or the rotational machine; and a diagnostic unit that diagnoses insulation degradation of the transformer or the rotational machine.
G01R 31/12 - Testing dielectric strength or breakdown voltage
H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yorikane, Shigeyuki
Takano, Masahiko
Morita, Kenji
Takeuchi, Yoshitaka
Abstract
A compressor body includes a compression mechanism including a screw rotor that compresses gas, a casing that accommodates the compression mechanism and defines a compression working chambers therein, a suction side bearing that rotatably supports the screw rotor, a bearing chamber that accommodates the suction side bearing, and a liquid supply port that communicates with the compression working chambers and supplies liquid supplied from the outside of the casing into the compression working chambers. The casing has an internal liquid supply flow path that extends from a discharge side of the compression working chambers as an upstream side to a suction side of the compression working chambers as a downstream side and that supplies the liquid to the liquid supply port. The internal liquid supply flow path has a downstream portion reaching the bearing chamber and supplies the liquid to the suction side bearing.
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
57.
Scroll fluid machine having separable main body unit and motor unit
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kato, Fuminori
Yamazaki, Shumpei
Kanemoto, Yoshiyuki
Emi, Takanori
Abstract
A scroll-type fluid machine includes a motor unit and a main body. The motor unit includes a rotor, a stator, a shaft provided with an eccentric portion at a distal end of the shaft and configured to rotate integrally with the rotor, a main bearing configured to support the shaft, and a motor cover configured to house the rotor and the stator. The main bearing is fixed to an inside of the motor cover by a fixing flange. The main bearing supports the shaft and is located between the fixing flange and an end bracket on an opposite side of the main body unit with respect to the fixing flange.
F04C 2/02 - Rotary-piston machines or pumps of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
F04C 15/00 - Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups
58.
Screw compressor having a screw rotor whose pitch changes in an axial direction from a suction end surface toward a discharge end surface
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Tanimoto, Shota
Yorikane, Shigeyuki
Komatsu, Tomohiro
Tsuchiya, Takeshi
Chiba, Kotaro
Abstract
This screw compressor is provided with a screw rotor, a casing accommodating the screw rotor, and a liquid feed mechanism for feeding a liquid into an operating chamber enclosed by the casing, wherein the pitch of the screw rotor changes in the axial direction from a suction end surface toward a discharge end surface.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Matsuzaka, Takehiro
Okaya, Masakatsu
Abstract
A preheating heat exchanger allows heat exchange between cooling water on an outlet side of an auxiliary cooling heat exchanger and supply water that has passed through a preheating bypass path.
F04C 28/26 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves using bypass channels
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Matsubara, Mitsuru
Tobari, Kazuaki
Takano, Yuuri
Uei, Yusuke
Yanada, Tetsuo
Abstract
An estimated value of frequency of a vibration component for automatically adjusting a control unit that suppresses resonance characteristics of a machine is stably and reliably estimated without depending on the magnitude of amplitude of the vibration component and without risk of arithmetic overflow. A motor control device including an automatic adjustment device that adaptively adjusts a controller included in a motor control system based on a frequency of a vibration component superimposed on a response of the motor control system, the automatic adjustment device including a vibration extraction unit that receives the response of the motor control system and extracts the vibration component from the response of the motor control system; a notch filter unit that receives the vibration component from the vibration extraction unit; an encoding unit; a limiter unit that receives an output of the notch filter unit; an adaptive updating unit; and a unit conversion unit.
H02P 21/05 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
H02P 23/04 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
61.
Screw Compressor Having a Plurality of Branch Paths with Intersects and Central Axes
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Chiba, Kotaro
Takano, Masahiko
Yorikane, Shigeyuki
Morita, Kenji
Takeuchi, Yoshitaka
Abstract
Provided is a liquid supply mechanism including: a plurality of liquid supply sections each including a plurality of branch paths whose central axes intersect with each other, and a supply path having a side surface to which the plurality of branch paths of the plurality of liquid supply sections are directly connected, respectively, and supplying liquid, which is supplied from an upstream, to the branch paths.
F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
B05B 1/26 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Okubo, Tomofumi
Suzuki, Norinaga
Tashima, Kiyomi
Takanuki, Akihiro
Abstract
A compressor, a monitoring system and a method of monitoring a compressor that make it possible to monitor the remaining lifetime of a semiconductor element of a motor control system while the processing load is reduced are provided. A compressor (1) includes: a motor control system (10) that controls the rotation speed of a motor (2); a compressor body (3) that compresses air by being driven by the motor (2); a pressure sensor (20) that is provided on the discharge side of the compressor body (3); and a running controller (11) that performs switching between load running and no-load running on the basis of the pressure sensed by the pressure sensor (20). A motor controller (26) of the motor control system (10) calculates a relative temperature of a semiconductor element relative to a reference temperature by using a temperature of the semiconductor element sensed by a temperature sensor (27) at the time of switching from no-load running to load running, and calculates an amount of change in a remaining lifetime of the semiconductor element corresponding to the relative temperature of the semiconductor element, whereby monitoring the remaining lifetime of the semiconductor element.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
H02P 29/02 - Providing protection against overload without automatic interruption of supply
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Yamamoto, Akihiro
Kanemoto, Yoshiyuki
Abstract
A fluid machine device includes a plurality of fluid machines that discharge a fluid; a worn state detection unit that detects a worn state of the fluid machine; a pressure detection unit that measures a pressure from the fluid machines; and a control unit that controls the plurality of fluid machines. The control unit determines whether or not there is the fluid machine that is worn, and performs control to start operation of the fluid machine that is not worn when the pressure is insufficient.
F04B 49/02 - Stopping, starting, unloading or idling control
F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Arima, Takahiro
Mizoguchi, Sho
Miyao, Akira
Ueda, Fumiormi
Okano, Mamoru
Abstract
Provided is an inkjet recording device capable of facilitating cleaning of a print head, and easily recovering a solvent (cleaning liquid) that is used for cleaning.
Provided is an inkjet recording device capable of facilitating cleaning of a print head, and easily recovering a solvent (cleaning liquid) that is used for cleaning.
An inkjet recording device includes a print head that receives a supply of ink to perform printing; and a main body that includes an ink container to contain the ink and a solvent container to contain a solvent, and that supplies the ink in the ink container to the print head. Further, the inkjet recording device includes a cleaning tank, a cleaning nozzle, and a recovery container. Then, the print head is set inside the cleaning tank, the solvent is sprayed from the cleaning nozzle to clean the print head, and the solvent after cleaning is recovered by the recovery container.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Morita, Kenji
Yorikane, Shigeyuki
Takano, Masahiko
Abstract
A position information antenna 22b receives a position signal including position information about a sending source (satellite, base station, or the like) of a positioning radio wave. A communication antenna 22a transmits position information about a compressor 100 (air compressor) that compresses the air and receives meteorological information corresponding to the position of the compressor 100 from a server on a cloud. A controller 13 specifies the position of the compressor 100 from the position signal received by the position information antenna 22b and controls the compressor 100 on the basis of the meteorological information corresponding to the position of the compressor 100 received by the communication antenna 22a.
F04C 28/06 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Matsumura, Takeshi
Kaneko, Takeshi
Abstract
Sample contamination is suppressed by strengthening the air barrier of a work opening portion. A safety cabinet includes: a work room; a front surface door covering a part of a front opening portion of the work room; and a work opening portion on a lower side of the front surface door allowing a worker to work with his or her hand in. An intake port suctions air in the work room and outside air through the work opening portion on a front surface side of a workbench in a lower portion of the work room. A straightening plate drawing an air flow and a linear light source are provided on the work room side of the front surface door and above a front portion of the work room.
B08B 15/02 - Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
F21S 4/28 - Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
F21Y 103/10 - Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Maki, Kohji
Iwaji, Yoshitaka
Ohashi, Hironori
Nakamura, Atsuhiko
Abstract
This power conversion device has: a current measurement unit for measuring phase current; a current vector calculation unit for calculating a current vector by performing 3-phase to 2-phase conversion on the phase current; an amount-to-be-analyzed calculation unit for calculating, on the basis of the current vector, an amount to be analyzed; and a feature amount waveform extraction unit for extracting a waveform in a specific frequency range on the basis of the amount to be analyzed.
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
H02H 5/04 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
There is provided an isolator that is capable of improving work efficiency by shortening a sterilization time, and that is capable of securing a sterility assurance level. An isolator, in which a circulation fan above a work room supplies clean air to the work room via a HEPA filter, includes: the work room; a front door provided in a front surface of the work room; a glove provided in the front door; and an air supply unit that causes an air supply HEPA filter to clean air taken in from an air supply airtight damper, and that causes an air supply fan to supply the clean air into the isolator, when work is performed. When a sterilization gas is removed, the air supply unit is configured such that the air supply fan circulates the air inside the isolator through a sterilization gas-removing catalyst.
B25J 21/02 - Glove-boxes, i.e. chambers in which manipulations are performed by the human hands in gloves built into the chamber walls; Gloves therefor
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Onuma, Yusaku
Sugimoto, Takuya
Abstract
An object of the present invention is to provide a power conversion device capable of suppressing an increase in a current flowing through a motor even if a voltage command exceeds the amplitude of a carrier wave. In order to achieve the above object, the power conversion device controls the driving of a motor by converting a DC voltage into a voltage based on a voltage command by an operation of a switching circuit and includes: a modulated wave generator that generates a first modulated wave from the voltage command; and a control signal generator that generates a control signal for controlling the operation of the switching circuit from the first modulated wave and a carrier wave. The modulated wave generator generates a square wave based on a voltage command norm as the first modulated wave.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 7/539 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
A safety cabinet includes a work space where work is performed; a front panel disposed in a front surface of the work space; and an air cleaner that cleans air to be supplied to the work space. An imaging device is disposed on one side surface side of side surfaces of the work space, and a connection opening is disposed on the other side surface side facing one side surface.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
The present invention provides a pass box with which not only surface sterilization by means of a germicidal lamp on an article delivered in the pass box but also isolation of different articles can be performed in a space-saving manner, the cleanliness in the pass box is maintained, and mutual contamination is prevented during article delivery in the pass box. Air is sent from a blower of an upper pass box to an upper space of the upper pass box through a filter, the air is supplied to a lower space of a lower pass box via the upper space, and an airflow circulation path is provided to return the air that has passed through the lower space to the upper blower.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yamamoto, Kentaro
Takano, Masahiko
Abstract
A waste-heat recovery system includes a waste-heat-recovery heat a tank, a circulation circuit, a circulation pump, and a control device that is configured to obtain the temperature of the heat medium flowing through a heat medium outlet piping of the circulation circuit and the temperature of the water stored in the tank. The control device stops the circulation pump or reduces the rotational frequency thereof in a case where the temperature of the heat medium flowing through the heat medium outlet piping is lower, or lower by a predetermined temperature or more, than the temperature of the water.
F25B 43/02 - Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
F24H 1/20 - Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
F04B 39/06 - Cooling; Heating; Prevention of freezing
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Matsuzaka, Takehiro
Okaya, Masakatsu
Abstract
A system has a compressor for discharging compressed gas, an aftercooler for cooling the compressed gas, a first cooling liquid pathway for supplying a cooling liquid to the compressor and for cooling the cooling liquid by means of a cooling heat exchanger, and a second cooling liquid pathway for passing the cooling liquid through the aftercooler and for recovering waste heat from the cooling liquid by means of a heat recovery heat exchanger, in which the compressor system includes a first valve and a second valve disposed in a plurality of bypass pathways connecting the first cooling liquid pathway and the second cooling liquid pathway, a third valve and a fourth valve disposed in the first cooling liquid pathway, and a control unit, and in which the control unit performs first control to close the first valve and the second valve and open the third valve and the fourth valve.
F04C 28/06 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
F04C 28/26 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves using bypass channels
74.
Print recording system and method for controlling print recording system
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Chen, Huilin
Takahashi, Takahiro
Kawano, Takashi
Abstract
A print recording system, including: at least one print recording device; and a computer system that includes a database storing a plurality of print setting information items and is capable of sending and receiving data with respect to the print recording device. The computer system searches the print setting information corresponding to a search condition that is input from the database in accordance with the search condition, repeats the search in accordance with a new search condition when the print setting information does not match the search condition, and sends the print setting information obtained by the search or the repeated search to the print recording device to set the print recording device.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Sato, Hirotoshi
Suwa, Toshihiko
Yokoyama, Makoto
Adachi, Haruhiko
Matsumura, Takeshi
Abstract
Provided is a fan filter unit with which the performance of a HEPA filter can be measured at multiple points with ease and in a short time. The fan filter unit has a first HEPA filter, a second HEPA filter, and exhaust means installed between the first HEPA filter and the second HEPA filter. The first HEPA filter, the second HEPA filter, and the exhaust means are integrated by a housing.
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Morita, Kenji
Takano, Masahiko
Hase, Masakazu
Abstract
A gas compressor includes: a compressor main body that compresses gas and discharges the compressed gas; an electric motor that supplies driving force; a power conversion device that supplies predetermined frequency power to the electric motor; at least one of a suction throttle valve disposed on the suction side of the compression main body and an air release valve that releases the compressed gas in a discharge piping system to an atmospheric pressure environment, and a controller. The gas compressor performs unload operation of reducing, when a discharge pressure reaches a predetermined pressure, a load on the compressor main body by closing the suction throttle valve or opening the air release valve. The gas compressor further includes a current value detector that detects a current value inputted to the power conversion device and outputs the current value to the controller.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Takanuki, Akihiro
Tashima, Kiyomi
Abstract
The purpose of the present invention is to improve the reliability of a power conversion system while reducing the size. In addition, the purpose of the present invention is to reduce noise. This power conversion system has a first power converting device that supplies power to a first motor and a second power converting device that supplies power to a motor different from the first motor, wherein the first power converting device and the second power converting device are each provided with a power converter for converting the power to be supplied to the motors, and a control unit for controlling the power converter, and the first power converting device is provided with a transformer unit for supplying power to the control units, and the transformer unit of the first power converting device supplies power to the control unit in the second power converting device.
H02P 5/74 - Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kasahara, Masayuki
Nikaido, Sho
Ishizuka, Yuki
Abstract
Provided is a multi-stage screw compressor with which an intermediate shaft section of a rotor can be made shorter.
A two-stage screw compressor includes a front-stage compressing mechanism 1 which has a front-stage male rotor 11A and a front-stage female rotor 11B, and which compresses air, and a rear-stage compressing mechanism 2 which has a rear-stage male rotor 12A and a rear-stage female rotor 12B, and which further compresses the air compressed by the front-stage compressing mechanism 1. The front-stage male rotor 11A and the rear-stage male rotor 12A are configured to be coaxial, and the front-stage female rotor 11B and the rear-stage female rotor 12B are configured to be coaxial. An axial delivery pocket 34 of the front-stage compressing mechanism 1 and an axial intake pocket 39 of the rear-stage compressing mechanism 2 are arranged in a positional relation of partly overlapping with each other in the axial direction of the rotor, and are separated from each other by a separating wall 41.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Narisawa, Nobuyuki
Umeda, Ken
Goto, Sho
Suzuki, Tatsuya
Abstract
There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. An outer peripheral surface of the piston is a curved surface.
F04B 37/10 - Pumps specially adapted for elastic fluids and having pertinent characteristics not provided for in, or of interest apart from, groups for special use
F04B 53/00 - Component parts, details or accessories not provided for in, or of interest apart from, groups or
F04B 53/14 - Pistons, piston-rods or piston-rod connections
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
A safety cabinet that includes an opening portion in a front surface of a work space and a front shutter, and supplies purified air into the work space from above. The front shutter slides in an upward and downward direction to close a part or an entirety of the opening portion. The front shutter includes a small window shutter that slides in a lateral direction.
F24F 8/108 - Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tobari, Kazuaki
Hadinata, Agnes
Nakamura, Atsuhiko
Watanabe, Hiroshi
Onuma, Yusaku
Sugimoto, Takuya
Taguchi, Yoshiyuki
Abstract
This power conversion device comprises: a power converter including a switching element; and a control unit which controls the power converter. The control unit calculates a torque electric current detection value and an excitation electric current detection value from an electric current flowing to an external device, and when an absolute value of the torque electric current detection value is greater than or equal to the excitation electric current detection value, performs control such that the excitation electric current detection value follows the torque electric current detection value.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Narisawa, Nobuyuki
Umeda, Ken
Goto, Sho
Suzuki, Tatsuya
Abstract
There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. A central axis of an inner diameter of the cylinder is disposed at a position shifted by an offset amount e with respect to a rotation center axis of the crankshaft. An upper surface of the piston is substantially parallel to a crankcase side surface of the valve plate in a state where the piston is at a top dead center.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F04B 53/14 - Pistons, piston-rods or piston-rod connections
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Watari, Takao
Igari, Mitsuo
Arima, Takahiro
Abstract
An inkjet recording device and a method for controlling an inkjet recording device are provided. A heating device that heats the ink to be supplied to a nozzle immediately ahead of the nozzle, a thermometer that detects a temperature of the ink inside the heating device or after heating, a viscometer that detects a viscosity of the ink in a main ink container are provided. The heating device is driven using a detection value of the thermometer to control the temperature of the ink such that the viscosity reaches an ink viscosity which enables normal printing, and when the viscosity of the ink is out of a range which enables printing, the solvent or the replenishment ink is supplied to the main ink container using a detection value of the viscometer such that the viscosity reaches the range which enables normal printing.
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Makaino, Yuki
Narisawa, Nobuyuki
Deguchi, Kenta
Abstract
A rotating machine drive system includes a power supply, an electric motor, a rotating machine, a belt drive transmission unit, an electrical information detection sensor, and a diagnostic unit. The electrical information detection sensor detects a current or a voltage. The diagnostic unit calculates estimated rotational speed information of the rotating machine based on the current or the voltage, calculates a reference rotational frequency from a rotational speed of the electric motor and a ratio between a diameter of the electric motor side pulley and a diameter of the rotating machine side pulley. The diagnostic unit uses a difference or a ratio between the estimated rotational speed information and the reference rotational frequency to determine whether or not there is the transmission abnormality.
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Satou, Kazuhiro
Sato, Takashi
Satou, Shindai
Shishido, Masanori
Abstract
To provide a vacuum valve pressure diagnosis device for an opening/closing device equipped with a vacuum valve, the diagnosis device which permits downsizing of the vacuum valve and achieves enhanced safety and reliability. Accordingly, the vacuum valve pressure monitoring device is disposed in a vacuum breaker including: a main circuit opening/closing part including the vacuum valve and an insulating frame covering the vacuum valve; and an operation mechanism part for opening/closing a contact of the vacuum valve. The pressure monitoring device for vacuum valve includes: a first electrode disposed on one side surface of the insulating frame and grounded via an impedance; a second electrode disposed on another side surface of the insulating frame and grounded via a switch; and a potential measuring device connected in between the impedance and the first electrode.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Aoyagi, Norio
Saito, Hiroaki
Kato, Fuminori
Oka, Daichi
Yamamoto, Akihiro
Abstract
There are provided an operation number control device and a method for controlling the same that can level the operation times of the fluid machines, which are connected to the operation number control device. A fluid machine system comprises a plurality of fluid machines, and an operation number control device capable of individually controlling start and stop of the fluid machines. The operation number control device sets a continuous operation time for each of the fluid machines based on total operation times of the fluid machine and other fluid machines. When among fluid machines in operation, there is a fluid machine for which the continuous operation time set for the fluid machine has elapsed and there is a fluid machine at stop, the operation number control device causes the fluid machine at stop to start and causes the fluid machine to stop.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Morita, Kenji
Takano, Masahiko
Yorikane, Shigeyuki
Abstract
The liquid level of a liquid supply compressor including a gas-liquid separator is dynamically monitored. A liquid supply gas compressor includes a compressor body; a gas-liquid separator separates liquid from compressed gas, to store the liquid; a liquid piping system supplies liquid stored to the compressor body; an internal pipe extends in an internal space of the gas-liquid separator, and includes at least two hole portions, with different disposition positions in a height direction, on an internal side to communicate with the piping system; and a sensor detecting pressure or temperature of fluid flowing through the piping system.
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Morita, Kenji
Takano, Masahiko
Yorikane, Shigeyuki
Takeuchi, Yoshitaka
Abstract
A simpler notification is given about identifying causes of abnormalities and indicating dealing methods or countermeasures to deal with the causes of abnormalities.
A simpler notification is given about identifying causes of abnormalities and indicating dealing methods or countermeasures to deal with the causes of abnormalities.
In a gas compressor including: a compressor body that compresses a gas; a drive source that drives the compressor body; at least one physical sensor that is disposed on at least one of a compressed-gas pipe or an electric system and detects a physical quantity in driving of the compressor body; a display unit; and a controller that processes the detected result from the physical sensor and causes the display unit to display information according to the processing, the controller stores in advance the associated relation between a preset range with respect to a rate of change of the physical quantity and information about at least one of a cause of a change in the physical quantity and a dealing method of dealing the cause, calculates a rate of change of the physical quantity on the basis of the detected result from the physical sensor, and causes the display unit to display information about at least one of the cause corresponding to the preset range and the dealing method of dealing with the cause when the calculated rate of change of the physical quantity is determined as falling in the preset range.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kaneko, Takeshi
Matsumura, Takeshi
Abstract
A pass box delivering an article with respect to a clean room includes a blower provided in an upper portion of the pass box, a first door on the clean room side, a first handle provided on the clean room side and opening and closing the first door, a first handle receiving portion rotating with the first handle in the pass box, a first handle receiving seat engaging with the first handle receiving portion in the pass box, and a storage stand provided in a lower portion of the pass box. The storage stand has a slit allowing air from the blower to be exhausted from an inner portion of the pass box.
F24F 9/00 - Use of air currents for screening, e.g. air curtains
F24F 8/95 - Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying specially adapted for specific purposes
F24F 3/167 - Clean rooms, i.e. enclosed spaces in which a uniform flow of filtered air is distributed
90.
Screw compressor having a lubrication path for a plurality of suction side bearings
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Chiba, Kotaro
Takano, Masahiko
Yorikane, Shigeyuki
Morita, Kenji
Abstract
A screw compressor includes plural screw rotors, plural suction-side bearings that each rotatably support the suction side of the plural screw rotors and plural discharge-side bearings that each rotatably support the discharge side of the plural screw rotors, and a casing that houses the plural screw rotors, the plural suction-side bearings, and the plural discharge-side bearings. Each screw rotor includes a lobe section with plural lobes and a suction-side shaft section and a discharge-side shaft section each disposed at both ends of the lobe section. The casing has a housing chamber that houses the lobe sections of the plural screw rotors and a lubrication path in which liquid that lubricates the plural suction-side bearings circulates. In the lubrication path, respective passages to lubricate each of the plural suction-side bearings are connected in series and a most downstream part is connected to the housing chamber.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Sato, Takashi
Watanabe, Muneaki
Kurihara, Hiroko
Abstract
To obtain a printing inspection device that an optimum binarization threshold value in the printing inspection device that captures an image including a two-dimensional code printed by a general-purpose printer such as an ink jet printer, as a multi-level image, creates a binary image from the multi-level image with a predetermined binarization threshold value, and then performs decoding. Before a practical printing inspection is performed, a read test is performed. The read test is performed on one or more inspection samples by binarizing a multi-level image with brightness values for all gradations as a threshold value. A range (maximum value and minimum value) of readable brightness values is obtained, and then a median value between the minimum value and the maximum value is used as a binarization threshold value for a two-dimensional code image in a practical printing inspection.
G06K 7/10 - Methods or arrangements for sensing record carriers by corpuscular radiation
G06K 7/14 - Methods or arrangements for sensing record carriers by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Imai, Mitsuhiro
Tamura, Fumiyuki
Abstract
In a control apparatus allowing control programs and information programs to coexist, execution management data that indicates the upper limit of resources that are resources usable by the programs is enabled to be appropriately changed. The control apparatus downloads at least one of one or more object programs (one or more programs among one or more control programs and one or more information programs) from a program distribution apparatus via a network and one or more network ports. At timing different from the timing of the download, the control apparatus changes the execution management data that indicates the upper limit of resources that are resources usable by the object program in relation to a plurality of computing resources of the control apparatus. Each control program is a program that performs a scan operation of outputting control information on the control object apparatuses coupled to I/O ports. Each information program is a program that performs information processing different from the scan operation.
G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control (DNC), flexible manufacturing systems (FMS), integrated manufacturing systems (IMS), computer integrated manufacturing (CIM)
93.
POSITION SPECIFYING SYSTEM FOR MOBILE OBJECT AND MOBILE OBJECT USED FOR THE POSITION SPECIFYING SYSTEM
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. (Japan)
Inventor
Mizuno, Takanobu
Kohiyama, Tomohisa
Abstract
A radio transmitter in a first radio communication device transmits first position information and first time information to a radio receiver of a vehicle. Also, a radio transmitter in a second radio communication device transmits second position information and second time information to the radio receiver. When the radio receiver of the vehicle receives the respective pieces of information, a position specification processing unit specifies the position of the vehicle based on the received pieces of information. Thus, the position of the vehicle can be specified with high accuracy even when signals from GNSS satellites cannot be received.
G01S 5/14 - Determining absolute distances from a plurality of spaced points of known location
G01S 19/48 - Determining position by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
G05D 1/02 - Control of position or course in two dimensions
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Nakajima, Takashi
Iyozumi, Akira
Abstract
A communication control system for a number of gas compressors where one gas compressor is set as a master gas compressor that controls communication with N slave gas compressors. A cycle of communication with the N slave compressors in N communication sets is defined as a total compressor number communication cycle. In first to Nth communication sets, a first response request is transmitted to each of the first to Nth gas compressors. When a response is received from one of the gas compressors, the system determines that connection with the one gas compressor has succeeded. When no response is received, the system determines that connection has failed. In following communication cycles, a second response request is transmitted to the slave compressors with which communication has succeeded. The first response request is then transmitted to the slave compressors with which the communication connection has failed using a different timing sequence.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Iwaji, Yoshitaka
Tobari, Kazuaki
Iwase, Yuuta
Onuma, Yusaku
Abstract
Provided is an AC electric motor control device capable of detecting, in an AC electric motor drive device, abnormal operation of an AC electric motor or abnormal operation due to, for example, a sudden change of a load without an erroneous operation regardless of the operational state of the AC electric motor. When driving a three-phase AC electric motor by an inverter, inside a controller, an electric motor constant is calculated using at least one of the current, voltage, and rotational speed of the electric motor and the variation of the constant value is analyzed, thereby detecting abnormal operation of the electric motor or abnormal operation of a load device connected to the electric motor. In order to analyze the constant, a variation to be determined to be abnormal is preset or an abnormal value is calculated in comparison with the accumulated values of past constant changes. Alternatively, only the variation of the constant calculated in the controller is extracted to detect abnormality.
H02P 21/16 - Estimation of constants, e.g. the rotor time constant
H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
B60L 3/00 - Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
H02P 21/22 - Current control, e.g. using a current control loop
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
B60L 15/20 - Methods, circuits or devices for controlling the propulsion of electrically-propelled vehicles, e.g. their traction-motor speed, to achieve a desired performance; Adaptation of control equipment on electrically-propelled vehicles for remote actuation from a stationary place, from alternative parts of the vehicle or from alternative vehicles of the same vehicle train for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
96.
Inkjet recording device and control method for inkjet recording device
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Kyu, An
Kawano, Takashi
Takagishi, Tsuneaki
Kato, Manabu
Abstract
To realize high-quality printing with less printing distortion by reducing an influence of a Coulomb force that acts between ink particles which are ejected in an inkjet recording device.
The inkjet recording device is configured to charge ink particles ejected from a nozzle, deflect the charged ink particles, and print a character in a shape of an object to be printed. In the inkjet recording device, dots of each column of the character to be printed are divided into a plurality of blocks in a column direction. In addition, charging voltage data in which the order of the ink particles corresponding to the dots is switched in the divided block unit is stored, and a predetermined charging voltage is applied to the charging electrode on the basis of the charging voltage data.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Tomita, Hitoshi
Bando, Mikio
Sugawara, Satoshi
Suehiro, Megumi
Tanikawara, Makoto
Abstract
A kinematic positioning system configured to determine position coordinates of moving bodies by receiving positioning signals from positioning satellites, comprises an on-vehicle device configured to calculate the position coordinates of one of the moving bodies based on carrier wave phases of the positioning signals received from the positioning satellites, and a ground management device configured to transmit correction data used to calculate the position coordinates to the on-vehicle device in response to a request from the on-vehicle device. The on-vehicle device executes a first processing sequence of performing precise point positioning computation by acquiring precise orbit data of each positioning satellite from any of the positioning satellite and the ground management device, and calculating the position coordinates, and a second processing sequence of sending the ground management device a pseudorange concerning a positioning satellite selected from the positioning satellites, a carrier wave, and the position coordinates of the one moving body, performing the precise point positioning computation by acquiring the correction data from the ground management device, and calculating the position coordinates. The on-vehicle device selects the position coordinates having a smaller data error out of the position coordinates calculated in the first processing sequence and the position coordinates calculated in the second processing sequence as the position coordinates of the one moving body.
G01S 19/43 - Determining position using long or short baseline interferometry
G01S 19/40 - Correcting position, velocity or attitude
G01S 19/07 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Yamamoto, Akihiro
Kanemoto, Yoshiyuki
Oka, Daichi
Abstract
Even when abnormal heat generation occurs during operation in a state where the temperature of a compressor is not increased, abnormality cannot be detected. A fluid machine includes a fluid machine body; a motor that drives the fluid machine body; a temperature sensor that measures a temperature of the fluid machine body; and a control unit that controls the fluid machine body. The control unit changes a temperature threshold value based on at least one of a pressure of a fluid discharged by the fluid machine body and a frequency of a voltage input into the motor, and issues a notification when the temperature of the compressor body measured by the temperature sensor exceeds the temperature threshold value.
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Suzuki, Tomoo
Yabe, Toshiaki
Itou, Yuuji
Abstract
A screw rotor which is hollow has improved performance against heat, pressure, rust, and the like. A screw rotor includes a screw portion of which an outer periphery has teeth and grooves having a helical shape and extending by a predetermined length in an axial direction. A radial cross section of at least a part of the screw portion includes a cross section of an outer surface portion forming the teeth and the grooves, a cross section of an axial center portion, a cross section of a support portion that connects an axial center side of the outer surface portion and an outer diameter side of the axial center portion, and a cross section of a hollow portion formed by the support portions adjacent to each other in a rotational direction and an axial center side inner surface of a tooth bottom or a tooth tip. In at least the radial cross section of the screw portion, different members are continuously joined as an integral structure in a cross section of at least one of the axial center portion and the support portion and the outer surface portion.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
Hitachi Industrial Equipment Systems Co., Ltd. (Japan)
Inventor
Ota, Yuya
Suzuki, Tomoo
Anzai, Yoshio
Abstract
Provided are a compressor and a monitoring system that can specify a cause of an anomaly of a sensed value of a sensor. A compressor (1) includes: a temperature sensor (11A) that senses a temperature of a compressed air on a discharge side of a low-pressure-stage compressor body (3) and on an upstream side of an intercooler (5); a pressure sensor (12A) that senses a pressure of the compressed air on the discharge side of the low-pressure-stage compressor body (3); a temperature sensor (11B) that senses a temperature of the compressed air on an intake side of a high-pressure-stage compressor body (6) and on a downstream side of the intercooler (5); a temperature sensor (11C) that senses a temperature of the compressed air on a discharge side of the high-pressure-stage compressor body (6); a controller (8) that decides whether or not an anomaly has occurred in sensed values of the sensors (11A), (11B), (11C), and (12A), and estimates a cause of the anomaly; and a display device (9) that displays the cause of the anomaly estimated by the controller (8).
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
F04C 28/08 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type