Abstract

A phase angle detection system according to one aspect of an embodiment of the present invention detects the phase angle of an electric motor in a drive system equipped with a transmission unit that changes the rotation speed of the electric motor. This phase angle detection system comprises: a first sensor; a second sensor; and an arithmetic processing unit. The first sensor outputs a first signal for detecting at least a specific phase angle of a rotor of the electric motor. The second sensor outputs a second signal that enables the detection of the amount of rotation of an output shaft of the transmission unit. In the arithmetic processing unit, the amount of deviation included in a detection result of the specific phase angle from the first signal is predefined for each rotational direction of the electric motor, and the deviation amount of the first signal determined by the rotational direction of the electric motor, the detection result of the first signal, and the second signal are used to calculate an estimated value of the absolute angle of the rotor of the electric motor.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position

Abstract

Provided is a control device in a power conversion device for photovoltaic power generation connected with solar panels at a DC side, wherein the control device comprises: a modulation rate calculation unit which calculates a modulation rate on the basis of a DC voltage of the DC side of the power conversion device and a system voltage RMS value of an AC side of the power conversion device; a limiter adjustment unit which calculates a lower limit limiter operation value on the basis of a prescribed lower limiter setting value, the system voltage RMS value, and a prescribed rated value in response to the modulation rate calculated by the modulation rate calculation unit; a limiter which updates a DC voltage command lower limit limiter on the basis of the lower limit limiter operation value calculated by the limiter adjustment unit; a maximum power point follow-up control unit which performs a maximum power point follow-up control on the basis of DC power generated by the solar panels to calculate a first DC voltage command value, and determines a second DC voltage command value on the basis of the calculated first DC voltage command value and the DC voltage command lower limit limiter set in the limiter; and an inverter control unit which controls an inverter in the power conversion device on the basis of the second DC voltage command value determined by the maximum power point follow-up control unit.

IPC Classes  ?

• H02M 7/48 - 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
• G05F 1/67 - Regulating electric power to the maximum power available from a generator, e.g. from solar cell

Abstract

Provided is a rolling risk presentation device that can present a rolling risk to an operator in a rolling plant such that countermeasures for suppressing and preventing the occurrence of an alarm are taken prior to rolling. The rolling risk presentation device comprises a system database, an alarm history information classification unit, an occurrence probability calculation unit, and a rolling risk presentation unit. The system database stores alarm history information including alarms generated in the past during rolling. The alarm history information classification unit classifies and organizes the alarm history information, that is stored in the system database, by each type of material to be rolled and product size. The occurrence probability calculation unit statistically calculates the number of occurrences of each alarm classified and organized by the alarm history information classification unit for each type of material to be rolled and product size, and calculates the probability of occurrence of each alarm. The rolling risk presentation unit displays the occurrence probability calculated by the occurrence probability calculation unit for each alarm, and thereby presents, to the operator in the rolling plant and before rolling of the material to be rolled, the rolling risks that may occur during rolling of the material to be rolled.

IPC Classes  ?

• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
• B21B 33/00 - Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls
• G05B 23/02 - Electric testing or monitoring

Abstract

In the present invention, a first communication line (F1) transmits a control signal (S) from an interface circuit (34) to an n-th drive circuit (GDn) in sequence via a first drive circuit (GD1). A second communication line (F2) transmits a semiconductor switch state detection signal (DS) from the n-th drive circuit (GDn) to the interface circuit (34) in sequence via the first drive circuit (GD1). An i-th drive circuit (GDi) includes a driver for driving an i-th semiconductor switch (SWi) in response to the control signal (S), an abnormality detection circuit for detecting an abnormality of the i-th semiconductor switch (SWi), and first and second notification members (A1, A2). The abnormality detection circuit detects an abnormality of the i-th semiconductor switch (SWi) on the basis of the control signal (S) and an operating state of the i-th semiconductor switch (SWi) and notifies of the detection result by using the first notification member (A1). The abnormality detection circuit generates state detection signals indicating operating states of the i-th to the n-th semiconductor switches (SWi to SWn), detects mismatch between the control signal (S) and the operating states of the i-th to the n-th semiconductor switches (SWi to SWn) on the basis of the control signal (S) and the state detection signals, and notifies of the detection result by using the second notification member (A2).

IPC Classes  ?

• H02H 7/00 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm
• H02H 3/05 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details with means for increasing reliability, e.g. redundancy arrangements
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A power supply device according to the embodiment supplies DC power to an electrolytic cell that generates hydrogen through electrolysis. This power supply device comprises: a self-excited power converter including a first output terminal and a second output terminal that outputs a positive voltage with respect to the first output terminal; a reactor serially connected to at least one of the first output terminal and the second output terminal; and a filter circuit connected between an anode and a cathode of the electrolytic cell. The filter circuit is a low-pass filter. The cutoff frequency of the filter circuit is set to be lower than the switching frequency of the power converter.

IPC Classes  ?

• C25B 9/65 - Means for supplying current; Electrode connections; Electric inter-cell connections
• H02M 7/02 - Conversion of ac power input into dc power output without possibility of reversal

Abstract

The purpose of the present disclosure is to provide an active gas generation device capable of supplying a high-concentration active gas. In an active gas generation device (5) according to the present disclosure, a first number of high-voltage electrode structures (13) are each held inside a holding space (S54) of a corresponding groove (54) among a first number of grooves (54), and a second number of grounding electrode structures (14, 3, 4) are each held inside a holding space (S54) of a corresponding groove (54) among a second number of grooves (54). The first number of high-voltage electrode structures (13) and the second number of grounding electrode structures (14, 3, 4) are alternately disposed in a Y-direction. A first planar region of each of the first number of high-voltage electrode structures (13) and a second planar region of each of the second number of grounding electrode structures (14, 3, 4) face each other with a separation space (S56) therebetween.

IPC Classes  ?

• H05H 1/24 - Generating plasma

Abstract

Provided is a camber control device for a continuous rolling mill, capable of reducing a camber in a tip part of a rolling material and suppressing the occurrence of telescoping of a steel strip coil. In this invention, a tip camber measurement unit calculates a tip camber measurement value at a rolling material tip part on the basis of a meandering amount of the rolling material detected by a meandering amount detector. A camber rectification leveling computation unit calculates a camber rectification leveling amount on the basis of the tip camber measurement value. A tip leveling setting unit sets a tip leveling control length and a tip leveling correction amount for reducing the tip camber for a reduction leveling device of each rolling stand. A reduction leveling control unit adjusts the reduction leveling device to a tip-leveling-correction-amount-added position before the rolling material enters the each rolling stand and adjusts the position of the reduction leveling device in such a manner that the tip leveling correction amount gradually decreases after the rolling length at the each rolling stand has reached the tip leveling control length.

IPC Classes  ?

• B21B 37/58 - Roll-force control; Roll-gap control
• B21B 37/68 - Camber or steering control for strip, sheets or plates, e.g. preventing meandering
• B21B 38/04 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
• B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses

Abstract

An assembly jig for a power conversion apparatus, comprising: a pair of fixing portions (11, 15) arranged so as to oppose each other in a first direction orthogonal to an up-down direction; and a supporting member (21) which is provided so as to be attachable from below to a pair of insulating frames (121, 122) fixed to the pair of fixing portions (11, 15) so as to oppose each other in a second direction orthogonal to the up-down direction and first direction and which is for supporting, in the state of being attached to the pair of insulating frames (121, 122), heat dissipation plates and power semiconductor elements that are alternately arranged to be stacked in the first direction between the pair of insulating frames (121, 122), wherein the supporting member (21) comprises a guide portion that, when the heat dissipation plates and power semiconductor elements having been stacked are pressure-welded to each other in the first direction, guides the movements of the heat dissipation plates and power semiconductor elements in the first direction.

IPC Classes  ?

• H01L 23/40 - Mountings or securing means for detachable cooling or heating arrangements
• H01L 25/10 - Assemblies consisting of a plurality of individual semiconductor or other solid state devices all the devices being of a type provided for in the same subgroup of groups , or in a single subclass of , , e.g. assemblies of rectifier diodes the devices having separate containers
• H01L 25/11 - Assemblies consisting of a plurality of individual semiconductor or other solid state devices all the devices being of a type provided for in the same subgroup of groups , or in a single subclass of , , e.g. assemblies of rectifier diodes the devices having separate containers the devices being of a type provided for in group
• H01L 25/18 - Assemblies consisting of a plurality of individual semiconductor or other solid state devices the devices being of types provided for in two or more different subgroups of the same main group of groups , or in a single subclass of ,

Abstract

The present disclosure provides a low-cost power conversion system that allows for lower loss and less space to be required. The power conversion system comprises: a power converter that converts DC power inputted from a DC power supply to AC power or DC power; a capacitor provided between a positive pole DC line and a negative pole DC line connected to an input terminal of the power converter; a ground line that connects the negative pole DC line and a ground potential and that is provided with a first grounding resistor; a discharge line that connects the positive pole DC line and the ground line on the ground potential side of the first grounding resistor; and a discharge switch that is provided in the discharge line and is turned ON when discharging the residual charge in the capacitor.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

A design assistance device (2) is configured to comprise: a data acquisition unit (11) for acquiring, as candidate design data for an electric motor, a plurality of pieces of candidate design data that include a plurality of design parameters, and acquiring a first evaluation value for each of the plurality of pieces of candidate design data; and a data generation unit (13) that selects, from among the plurality of pieces of candidate design data acquired by the data acquisition unit (11), some pieces of candidate design data from the first place in the descending order of the first evaluation value as a plurality of pieces of first candidate design data and generates, from the plurality of pieces of first candidate design data, a plurality of pieces of second candidate design data including the plurality of design parameters. In addition, the design assistance device (2) comprises: an evaluation value calculation unit (14) that calculates a second evaluation value for each piece of the first candidate design data on the basis of the plurality of design parameters contained in this piece of the first candidate design data and calculates the second evaluation value for each piece of the second candidate design data on the basis of the plurality of design parameters contained in this piece of the second candidate design data; and a design data selection unit (15) for using the second evaluation values calculated by the evaluation value calculation unit (14) to select, from among the plurality of pieces of first candidate design data and the plurality of pieces of second candidate design data, candidate design data to be used as the design data for the electric motor.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 111/06 - Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]

Abstract

This electric power conversion control device comprises: an optical fiber; an optical detection part; and a protection control part. The optical fiber is formed to guide light taken in through the side surface of an extending light guide part in the extension direction and to output the light from an end of the light guide part. The optical detection part detects the light guided to the end of the light guide part. When the optical detection part has detected light resulting from an accident accompanied by arc flash, the protection control part halts electric power conversion carried out by an electric power converter relating to the optical fiber.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

Provided is an EV charging facility comprising: a plurality of charging stands that, by being attachably/detachably connected to EVs, charge power storage devices mounted to the connected EVs; a plurality of power supply circuits that convert power fed from a power system side into DC power corresponding to the EVs and feed the converted DC power to any of the charging stands; a charging and discharging stand that, by being attachably/detachably connected to an EV, charges and discharges a power storage device mounted to the connected EV; and a bidirectional converter that performs bidirectional power conversion in a direction in which the power storage device of the EV connected to the charging and discharging stand is charged and a direction in which the power storage device of the EV connected to the charging and discharging stand is discharged. Accordingly, it is possible to provide an EV charging facility which comprises a plurality of charging stands and which can reduce contracted power with a simpler configuration, and an operation method therefor.

IPC Classes  ?

• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers

Abstract

According to one embodiment of the present invention, an inverter apparatus (100) comprises: a power converter (101) for an armature winding; a power converter (102) for a field winding; a velocity control unit (110) which controls three-phase current on dq-axes; a field current control unit (120) which controls field winding current; a simulator (130); and a damper winding failure detection device (200). The damper winding failure detection unit (200) has: a switching unit (210) which switches between a normal operation mode and a failure inspection mode; an inspection current command value generation unit (220) which outputs an AC as a q-axis current command and outputs a DC equivalent value as a d-axis current command in the failure inspection mode; and an inspection time measurement/determination unit (230) which measures a response in a field winding (13) and determines, from a response signal, the presence or absence of anomaly in the damper winding.

IPC Classes  ?

• H02P 23/00 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control
• H02P 6/32 - Arrangements for controlling wound field motors, e.g. motors with exciter coils
• H02P 25/022 - Synchronous motors

Abstract

This electromagnetic wave detection device detects electromagnetic waves from an electromagnetic wave generation source (100) in a first space A in which the electromagnetic wave generation source (100) is disposed and a second space B that is divided by a partitioning plate (200) which attenuates the propagation of electromagnetic waves. The electromagnetic wave detection device comprises an electromagnetic wave observation part (10) comprising a metal wire including: a penetration section (11) that penetrates through a through hole (200A) formed in the partitioning plate (200) while being spaced apart from a peripheral wall of the through hole; a protrusion section (12) that protrudes from the penetration section (11) toward the first space A, and receives electromagnetic waves from the electromagnetic wave generation source (100); and an extension section (13) that extends from the penetration section (11) into the second space B. One end of the electromagnetic wave observation part that is positioned on the second space B side is connected to a ground contact point (300) positioned on the second space B side.

IPC Classes  ?

• G01R 29/08 - Measuring electromagnetic field characteristics
• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

The present disclosure provides a hot rolling mill plate thickness control device capable of reliably threading a tip end portion of material being rolled, without increasing equipment costs, even if the material being rolled is being rolled to be extremely thin. The hot rolling mill plate thickness control device comprises: a plate thickness gauge installed on an exit side of a final rolling stand in a row-arrangement direction; a gap calculating unit for calculating a gap between rolls of each rolling stand, said gap being greater than a product target plate thickness of the material being rolled and corresponding to a threadable plate thickness with which the tip end portion of the material being rolled can be stably threaded; a gap setting unit for setting the gap calculated by the gap calculating unit for each rolling stand; an automatic plate thickness control unit for executing automatic plate thickness control to minimize a plate-thickness deviation between a plate thickness measured value from the plate thickness gauge and the threadable plate thickness; and a target plate thickness changing unit for changing the threadable plate thickness to the product target plate thickness by adding a plate-thickness bias to the plate-thickness deviation with a predetermined ramp rate, after the tip end portion of the material being rolled has been threaded through the final rolling stand.

IPC Classes  ?

• B21B 37/20 - Automatic gauge control in tandem mills

Abstract

This control device comprises: a first action control unit that causes a DC switch to open when a power conversion device is in a standby state and when a first DC voltage value acquired by a voltage acquiring unit has become greater than a predetermined first threshold; a clock unit that, when the DC switch is opened by the first action control unit, clocks the elapsed time after the DC switch has been opened; and a soundness determining unit that when the DC switch is opened while the power conversion device is in the standby mode and when the elapsed time period clocked by the clock unit has reached or exceeded a predetermined first time period, calculates a first differential voltage value that is the difference between the first DC voltage value acquired by the voltage acquiring unit and a second DC voltage value, determines that the DC switch is normal when the first differential voltage value is greater than a predetermined second threshold, and determines that the DC switch is abnormal when the first differential voltage value is equal to or less than the predetermined second threshold.

IPC Classes  ?

• H02H 7/122 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
• G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

The daisy chain communication path of this power conversion system connects a master station that controls a plurality of slave stations each including a power conversion device and the plurality of slave stations to each other. The plurality of slave stations are configured so as to supply power from the power conversion device within each slave station to each load device. The plurality of slave stations switch between "operation" for supplying power from the power conversion devices and "stop" for interrupting the supply of the power to supply the power to the respective load devices. The daisy chain communication path forms a set of a first communication path for sending a control signal α and a second communication path for sending an operation permission signal β. When detecting a communication failure, each of the plurality of slave stations "stops" the supply of power to the power conversion device of a relevant slave station that has detected the communication failure and controls the other slave stations among the plurality of slave stations using the control signal α and the operation permission signal β to "stop" the supply of the power to the power conversion devices of the other slave stations. After that, in a state in which the power supply from each power conversion device is "stopped", the whole or a part of the plurality of slave stations notify, using the control signal α, the master station of information about a failure location in which the failure location is identifiably specified.

IPC Classes  ?

• H02M 7/48 - 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
• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters

Abstract

This DC power distribution system comprises a DC bus line (100) distributing DC power, a first power converter (CPL), and a voltage stabilizing device (10). The first power converter (CPL) is connected between the DC bus line (100) and a load and converts the DC power from the DC bus line (100) to the power required by the load. The voltage stabilizing device (10) is connected to the DC bus line (100) in parallel with the first power converter (CPL). The voltage stabilizing device (10) supplies power to the DC bus line (100) in accordance with the variation of an input voltage input from the DC bus line (100) to the first power converter (CPL) and the DC power supplied from the DC bus line (100) to the first power converter (CPL).

IPC Classes  ?

• H02J 1/00 - Circuit arrangements for dc mains or dc distribution networks

Abstract

This sheet width control device is applicable to a reversing rolling mill that comprises: an edger that has a pair of edger rolls that perform edge rolling on a material being rolled; and a horizontal rolling mill that is disposed downstream of the edger and has a pair of horizontal rolls that perform horizontal rolling on the material being rolled. The sheet width control device comprises a reduction control device, a reduction position detector, a tracking device, and a sheet width actual value calculation device. The reduction control device is configured to cause the edger to operate such that the pair of edger rolls make contact with the material being rolled during reverse pass rolling. The reduction position detector is configured to detect the reduction position of the edger when the pair of edger rolls are in contact with the material being rolled during reverse pass rolling. The tracking device is configured to track the position in the longitudinal direction of the material being rolled during reverse pass rolling. The sheet width actual value calculation device is configured to calculate a sheet width actual value for the material being rolled at a plurality of positions in the longitudinal direction on the basis of the output of the reduction position detector and the output of the tracking device.

IPC Classes  ?

• B21B 38/04 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• B21B 37/22 - Lateral spread control; Width control, e.g. by edge rolling

Abstract

This method for assisting operation in a rolling line comprises a step for acquiring various data related to a rolled product manufactured on the rolling line. The method comprises: a step for calculating, for each product specification and on the basis of the various data, an occurrence rate of errors occurring in at least one of the quality of a rolled product, the operating status of a rolling line, and operator operations on actuators of the rolling line; and a step for setting, for each product specification and in accordance with how high the occurrence rate is, the manufacturing difficulty of the rolled product. The method further comprises a step for outputting assistance data from an operator terminal to assist an operator who is involved in a manufacturing process of an object to be manufactured on the rolling line, the assistance data comprising, as data on the manufacturing difficulty of the object to be manufactured, data on the manufacturing difficulty of a rolled product having the same product specifications as the product specifications of the object to be manufactured.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby

Abstract

The present disclosure provides a plate thickness control method for a rolling mill whereby it is possible to calculate an appropriate gap correction amount for the rolling mill on the basis of the amount of change in a rolling load between a previous material and a material in question, and to thus improve plate thickness precision. The plate thickness control method for a rolling mill includes: a step in which a rolled coil rolled immediately beforehand by a rolling mill is designated as a previous material, a rolled coil rolled after the previous material is designated as a material in question, the relationship between the amount of change in a rolling load between the previous material and the material in question and the amount of change in a gap error regarding the rolling mill is approximated sequentially by means of a regression model, and a gap error in the rolling of the material in question is predicted on the basis of the regression model; a step in which a gap setting amount in rolling of the material in question is corrected on the basis of the predicted value of the gap error; and a step in which a regression coefficient of the regression model is updated on the basis of the actual rolling load obtained by rolling the material in question and the amount of change in the actual gap error.

IPC Classes  ?

• B21B 37/58 - Roll-force control; Roll-gap control
• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/64 - Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands

Abstract

A winding control system according to one embodiment comprises: a motor drive control device that controls the driving of a motor which rotationally drives a mandrel for winding a rolled material around a coil; a tail end sensor that detects one point of the rolled material to thereby output a detection signal indicating that the rolled material passes through a tail end; a winding control device that tracks the position of the tail end; a first camera that is provided between the finishing roll mill and the mandrel and captures images for first image data including information about the shape of the tail end; and an image analysis device that performs image analysis on the first image data at a timing at which the detection signal is emitted, generates a correction value for correcting the position of the tail end on the basis of a result of the image analysis of the image data, and outputs the correction value to the winding control device. The winding control device corrects the position of the tail end by using the correction value.

IPC Classes  ?

• B21C 47/02 - Winding-up or coiling
• B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses

Abstract

The power supply device according to an embodiment comprises: a power conversion unit including first input terminals, a first capacitor connected between the first input terminals, a first output terminal that supplies output current to an electromagnet, a first power conversion circuit connected between the capacitor and the output terminal, and first wiring that electrically connects the capacitor and the power conversion circuit to each other; and a control device that controls the power conversion unit on the basis of current command values sequentially supplied from the outside. The control device detects the sequential two maximal current values or sequential two minimal current values of the current command values to estimate the frequency of the output current.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

The present disclosure provides a thickness schedule calculation method and a rolling plant that make it possible to calculate and set a limit value for a limit check that is preferable for maintaining a stable rolling and operating state with reduced rolling troubles. The thickness schedule computing method comprises a computing step of computing a thickness schedule by using a rolling model formula including a forward slip model and a rolling load model, on the basis of a rolling load or motor power. The computing step includes a calculating step of calculating at least one of an upper limit value and a lower limit value of the rolling reduction ratio in each rolling stand on the basis of past rolling data, for each product specifications including a steel type category for rolling and a thickness category, and a setting step of setting at least one of the upper limit value and the lower limit value calculated in the calculating step as a limit value for a limit check with respect to the rolling reduction ratio.

IPC Classes  ?

• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby

Abstract

In the present invention, a command value limiter applies limits to command values which are issued by a host device and which are for charging power and discharging power. A drive signal generator generates a drive signal for an inverter circuit in accordance with a command value for charging power limited by the command value limiter or a command value for discharging power limited by the command value limiter. A PI controller, in response to a direct-current voltage that is applied to the inverter circuit being higher than the working voltage of a charging limiter, calculates a PI control value (a PI control value for limiting charging) for the deviation between the direct-current voltage and the working voltage of the charging limiter and, in response to the direct-current voltage being lower than the working voltage of a discharging limiter, calculates a PI control value (a PI control value for limiting discharging) for the deviation between the direct-current voltage and the working voltage of the discharging limiter. A limiter regulator strengthens limitation of the command value for charging power from the command value limiter in accordance with the PI control value for limiting charging and strengthens limitation of the command value for discharging power from the command value limiter in accordance with the PI control value for limiting discharging.

IPC Classes  ?

• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02M 7/48 - 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

Abstract

An insulation diagnosis device according to an embodiment performs insulation diagnosis for a three-phase alternate-current motor on the basis of a U-phase current, a V-phase current, and a W-phase current supplied to the three-phase alternate-current motor, the insulation diagnosis device comprising: a current vector calculation unit (23, 24) that calculates at least one of a zero-phase current vector or a negative-phase current vector on the basis of the U-phase current, the V-phase current, and the W-phase current; a reference current vector storage unit (25) that pre-stores a reference current vector; a current difference vector calculation unit (26) that calculates a current difference vector, which is the difference between the current vector calculated by the current vector calculation unit (23, 24) and the reference current vector; and a determination unit (28) that determines the insulation state of the three-phase alternate-current motor on the basis of the current difference vector.

IPC Classes  ?

• G01R 31/34 - Testing dynamo-electric machines
• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01R 31/52 - Testing for short-circuits, leakage current or ground faults

Abstract

The present disclosure provides a system for controlling cutting by a crop shear, the system being capable of suppressing cutting errors in a cut material at a set cutting point to the extent possible even if the speed of the cut material varies. This system for controlling cutting by a crop shear, which cuts a cut material being transported on a hot-rolling line, comprises an image detector that detects an image of the cut material being transported, the image detector being disposed on the input side of the crop shear. A tip end position or tail end position of the cut material and the movement amount of the cut material are established from the image data detected by the image detector, and the drive speed of cutting blades of the crop shear is adjusted on the basis of the established tip end position or tail end position and movement amount of the cut material.

IPC Classes  ?

• B23D 36/00 - Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock while the latter is travelling otherwise than in the direction of the cut

Abstract

In the event of power interruption of a commercial AC power source (6), this uninterruptible power supply device: controls a bidirectional chopper (2) such that a DC voltage (VD) between DC lines (L1, L3) becomes a second reference voltage (VDR 2) higher than a first reference voltage (VDR 1) for a prescribed time (Tc); and then controls the bidirectional chopper (2) such that the DC voltage becomes the first reference voltage. Accordingly, during power interruption, a battery current (IB) can be temporarily increased above usual, and even when a small-sized capacitor (C1 to C4) is used, it is possible to prevent the DC voltage from dropping below a lower limit voltage (VDL).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is a control device of a power conversion device, said power conversion device comprising: at least one alternating-current capacitor that is disposed in a capacitor circuit which branches from an alternating-current circuit on an output side of an inverter, and that is disconnected from the circuit during a failure; and an electric current sensor that is disposed in the capacitor circuit, and that acquires an electric current value of an alternating-current electric current of each phase flowing to the alternating-current capacitor. The control device comprises: an amplitude calculation unit that acquires, from the electric current sensor, the electric current value of the alternating-current electric current of each phase flowing to the alternating-current capacitor, and that calculates, on the basis of the acquired electric current value of the alternating-current electric current of each phase, a value of an amplitude of a fundamental wave component of the alternating-current electric current of each phase; and a failure determination unit that compares the sizes of a prescribed determination value and the value of the amplitude of the fundamental wave component of the alternating-current electric current of each phase calculated by the amplitude calculation unit, and that determines that there is a failure of the alternating-current capacitor if the value of the amplitude of at least one phase among the values of the amplitude of the fundamental wave component of the alternating-current electric current of the phases is less than the prescribed determination value.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

The present invention provides a SCADA web HMI system that can prevent delay in updates of display on screens of HMI client machines and stoppage of a server machine even when a processing load on the server machine is large. A SCADA server machine comprises a communication driver and a client management unit that is connected one-to-one with HMI client machines. The client management unit comprises: a reception thread that receives signal data from the communication driver; first and second signal data buffers that can store the signal data, which is received by the reception thread, in association with a signal data identifier for each data type; and a transmission thread that reads signal data stored in the first or second signal data buffer, and transmits the read signal data to an HMI client machine. While the transmission thread is reading signal data from one of the first and second signal data buffers and transmitting the read signal data to an HMI client machine, signal data stored in the other one of the first and second signal data buffers is overwritten.

IPC Classes  ?

• H04L 67/5651 - Reducing the amount or size of exchanged application data
• H04Q 9/00 - Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A control panel according to an embodiment comprises a housing, an article placement board, and a pull-out mechanism. The front surface of the housing is open. The article placement board is disposed along the front-back direction inside the housing, and has articles attached thereto. The pull-out mechanism pulls out the article placement board in the forward direction while maintaining the orientation thereof when housed inside the housing. The present invention provides a control panel with which it is possible to effectively use the space inside the housing, improve ease of use, and support flexible article placement.

IPC Classes  ?

• H05K 7/18 - Construction of rack or frame
• H02B 1/36 - Racks with withdrawable units

Abstract

This electric power conversion unit is provided with a housing, a plurality of fans, a heat sink, and a plurality of semiconductor elements. The fans cause an air flow inside the housing. The heat sink forms an air flow passageway upstream of an air circulation path inside the housing. The plurality of semiconductor elements are arranged side-by-side along a direction transverse to the air circulation direction of the heat sink on an element arrangement surface of the heat sink.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02M 7/48 - 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

Abstract

This phase synchronization control circuit (12) comprises: a phase difference detector (20) that detects a phase difference (Δθ) between an AC voltage (VI) and an AC signal (vac); a frequency control unit (21) that generates a first frequency control value (Fc1) such that the phase difference disappears; a frequency limiter (25) that limits the first frequency control value (Fc1) within a variable limit range and generates a second frequency control value (Fc2); a limiter control unit (26) that sets the variable limit range on the basis of the phase difference, and reduces the width of the variable limit range in accordance with a reduction of the phase difference; and an oscillator (28) that generates an AC signal of a frequency that takes a value that corresponds to the second frequency control value. Accordingly, overshoot of the frequency of the AC signal can be kept low.

IPC Classes  ?

• H02M 7/48 - 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
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H03L 7/08 - Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop - Details of the phase-locked loop

Abstract

A rotating electric machine (10) according to an embodiment comprises a housing (13), a bearing (15), and a cylindrical member (17). The bearing (15) rotatably supports a shaft (14) around a rotating central axis (Ax). The cylindrical member (17) has an oil thrower portion (17m) and a seal portion (17n) which are integrally formed. The oil thrower portion (17m) is cylindrically formed around the rotating central axis (Ax), and the shaft (14) is inserted into the inside thereof. The oil thrower portion (17m) is separated from the outer circumferential surface (14a) of the shaft (14) with a first space. The seal portion (17n) is positioned opposite the bearing (15) with respect to the oil thrower portion (17m) and is cylindrically formed around the rotating central axis (Ax). The seal portion (17n) is separated from the outer circumferential surface (14a) with a second space smaller than the first space.

IPC Classes  ?

• H02K 5/173 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
• F16C 33/66 - Special parts or details in view of lubrication
• F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members

Abstract

An uninterruptible power supply device (100) comprises a compensation power supply circuit (1) and a bypass circuit (20). The bypass circuit is provided electrically in parallel to the compensation power supply circuit. The bypass circuit includes first to third switches (15U-15W) and first to third circuits (17-19). The first to third switches are respectively connected to first to third phases of a three-phase alternating current load. The first to third circuits are respectively provided electrically in parallel to the first to third switches. The first circuit includes a first snubber circuit (17A), a second snubber circuit (17B), and a power line (PL11). The second circuit includes a first snubber circuit (18A), a second snubber circuit (18B), and a power line (PL12). The third circuit includes a first snubber circuit (19A), a second snubber circuit (19B), and a power line (PL13). The respective power lines (PL11, PL12, and PL13) of the first to third circuits are electrically connected to each other.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02M 7/48 - 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

Abstract

A plurality of connection members (10, 20) are connected to an electric apparatus and extend in a first direction perpendicular to a vertical direction. A plurality of terminal members (30, 40) are respectively attached to the plurality of connection members (10, 20) and have a plurality of electric wires respectively connected thereto. The plurality of terminal members (30, 40) respectively include fixing portions (31, 41) and connection portions (32, 42). The fixing portions (31, 41) are attached to the connection members (10, 20) and extend in the first direction. The connection portions (32, 42) are connected to one end portions of the fixing portions (31, 41) in a longitudinal direction and have the electric wires connected thereto. The connection portions (32, 42) extend in a direction orthogonal to the direction in which the fixing portions (31, 41) extend. The plurality of terminal members (30, 40) are respectively attached to the connection members (10, 20) in either a first posture in which the connection portions (32, 42) extend upward in the vertical direction or a second posture in which the connection portions (32, 42) extend downward in the vertical direction.

IPC Classes  ?

• H02B 1/20 - Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A rack (110) comprises a first to a fourth column members (11 to 14), and a first and a second guide members (15A, 15B). A casing of an electric device (20) has a first and a second side surfaces in the width direction that are respectively supported by the first and second guide members (15A, 15B). A first and a second regulation members (30A, 30B) are respectively attached to the inner surfaces of the first and second side surfaces of the casing to regulate movement of the casing toward the front of the rack (110). The second regulation member (30B) is opposed and attached to the first regulation member (30A) in the width direction. In a state in which the electric device (20) is housed in the rack (110), the first regulation member (30A) is positioned between the first and third column members (11, 13) in a fore-aft direction. The second regulation member (30B) is positioned between the second and fourth column members (12, 14) in the fore-aft direction.

IPC Classes  ?

• H05K 7/18 - Construction of rack or frame

Abstract

The purpose of the present invention is to obtain an active-gas-generating apparatus that can supply high-concentration active gas from a gas jetting port to a downstream process space. In the active-gas-generating apparatus (51) of the present disclosure, a region in which electrically conductive films for electrodes (31, 41) overlap as seen in plan view within a main dielectric space, which is the space in which a dielectric film for electrodes (30) and a dielectric film for electrodes (40) face each other, is defined as a main discharge space (50). A region including a dielectric through-port (14) and a cover through-port (15) within an auxiliary dielectric space, which is the space in which the dielectric film for electrodes 30 and a shield dielectric film 8 face each other, is defined as an auxiliary discharge space (58). The auxiliary discharge space (58) includes a portion of a buffer space (9) above the shield dielectric film (8), and a path that reaches from the auxiliary discharge space (58) to gas jetting ports (61, 62) is defined as the active gas flow path.

IPC Classes  ?

• H05H 1/24 - Generating plasma

Abstract

This power conversion system control device comprises: a power converter connected to a power source or to a capacitor via wiring; a coil disposed in a position which is around the wiring and at which, when a short circuit failure has occurred because of voltage in the capacitor or in the power source being short-circuited, magnetic fluxes generated by the short circuit failure are interlinked; and a voltage detection circuit for detecting the voltage value of voltage between both ends of the coil. The power conversion system control device further comprises: a voltage acquisition unit for acquiring the voltage value of voltage between both ends of the coil detected by the voltage detection circuit; and a failure detection unit for detecting a short circuit failure of the power converter on the basis of the voltage value acquired by the voltage acquisition unit.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

According to the present invention, a rolling productivity improvement assistance device for a plant that rolls an iron/non-iron material comprises a data collection unit that collects plant data that includes a production plan, production results, and an operating state from the plant, an indicator calculation unit that, for the plant data acquired by the data collection unit, calculates a productivity, factors for the productivity, and a value for an indicator for each of the factors, a data storage unit that stores the plant data acquired by the data collection unit and indicator data that is data for the values of the indicators calculated by the indicator calculation unit, a productivity evaluation unit that, each time plant data has been gathered, compares the indicators for a productivity to be evaluated with results for the indicators for past productivities to evaluate productivity decline, and a display unit that displays the results of the productivity decline evaluation by the productivity evaluation unit, the productivity that was the basis for the evaluation results, the factors for the productivity, and the value of the indicator for each of the factors.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
• 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)

Abstract

The purpose of the present invention is to: when a sensor failure occurs during plant operations, provide support by comparing amounts of decrease in production quantity for various possible operational actions and performing guidance display of operation actions which are optimal from the perspective of productivity; and minimize the amount of decrease in production quantity. To accomplish this, this plant operation support system performs a guidance display of provisional action information in a case in which, in a state in which a sensor has failed, the post-provisional action production quantity, for when a provisional action is implemented on the plant and operations are continued in accordance with provisional action information for continuing operations of the plant, is greater than or equal to the post-replacement production quantity, for when restarting operations after work for replacing the failed sensor with a normal sensor is performed.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

This plate crown control device controls tandem rolling equipment on the basis of an outlet plate crown setting calculation value of each stand as calculated by setting calculation, a mechanical plate crown setting calculation value of each stand, and a bending force and shift position setting value of each stand. A processor calculates a first current learning value on the basis of the difference between a mechanical plate crown observation value and a mechanical plate crown result calculation value. The processor proportionally divides a first learning value by the first current learning value and a smoothing gain and updates the first learning value. The processor, in the next setting calculation and thereafter, calculates the bending force and shift position setting value of each stand by using a corrected mechanical plate crown setting calculation value obtained by adding the first learning value to the mechanical plate crown setting calculation value.

IPC Classes  ?

• B21B 37/38 - Control of flatness or profile during rolling of strip, sheets or plates using roll bending
• B21B 37/28 - Control of flatness or profile during rolling of strip, sheets or plates

Abstract

This load current distribution adjusting device for a storage battery power conversion device comprises: a cross current calculation unit for calculating the cross current of a relevant power conversion device on the basis of an average current of the output currents of a plurality of storage battery power conversion devices performing an autonomous parallel operation and the output current of the relevant power conversion device; a first correction amount calculation unit for calculating a first correction amount of a voltage command value on the basis of the cross current calculated by the cross current calculation unit and the output voltage of the relevant power conversion device; a gain calculation unit for calculating a weighted gain of the relevant power conversion device on the basis of an average voltage of the respective DC voltages of the plurality of storage battery power conversion devices and the DC voltage of the relevant power conversion device; a second correction amount calculation unit for calculating a second correction amount of the voltage command value on the basis of the first correction amount calculated by the first correction amount calculation unit and the weighted gain calculated by the gain calculation unit; and an output current control unit for controlling the output current of the relevant power conversion device on the basis of a predetermined voltage command value and the second correction amount calculated by the second correction amount calculation unit.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
• H02J 7/34 - Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

This uninterruptible power supply apparatus 1 comprises an operation unit (11) for setting a second reference voltage (VBR), a computation unit (21) for establishing a first reference voltage (VDR) that is higher than the set second reference voltage and lower than a maximum value (VDRmax) for the first reference voltage, a first reference voltage generation unit (22) for generating the first reference voltage established by the computation unit, and a second reference voltage generation unit (32) for generating the second reference voltage set by the operation unit. Therefore, the voltage (VD) of a DC line (4) can be reduced below the maximum value for the first reference voltage, and the efficiency of the uninterruptible power supply apparatus 1 can be improved.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A detection device according to an embodiment of the present application detects the presence or absence of a workpiece adhered to the inner wall of a drum of a mill for crushing minerals. This detection device stores an initial torque detected at a preset initial rotation angle, calculates a maximum torque on the basis of the initial torque, the initial rotation angle, and a rotation angle greater than the initial rotation angle, calculates the ratio of the torque at the rotation angle divided by the maximum torque, compares the ratio to a preset threshold, and determines that there is a workpiece adhered to the inner wall of the drum if the ratio is equal to or greater than the threshold.

IPC Classes  ?

• B02C 17/18 - Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls - Details

Abstract

This SCADA web HMI client device comprises a processor and a memory. The memory stores a user access level, image data of an HMI screen, and screen access right information that are received from a web server. The screen access right information includes an operation access level of the HMI screen and operation possibility of the HMI screen through a web browser. The processor draws the HMI screen on the web browser in an operation possible state when the user access level is equal to or higher than the operation access level and an operation on the HMI screen through the web browser is allowed. The processor draws the HMI screen on the web browser in an operation impossible state when the user access level is lower than the operation access level or the operation on the HMI screen through the web browser is not allowed.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

In the present invention, a power converter comprises: an inverter that includes a plurality of switching elements, receives DC voltage from a DC voltage source as an input, converts the received DC voltage to variable-voltage, variable-frequency AC voltage, and outputs the converted AC voltage to a load; a control unit that performs PWM control for driving the plurality of switching elements on or off; and a serial arrangement of a positive-electrode-side capacitor and a negative-electrode-side capacitor connected between a positive electrode and a negative electrode of a DC voltage on the input side of the inverter. The output potential of the inverter has at least: the potential of the positive electrode of the DC voltage source; the potential of the negative electrode; and the potential of the neutral point, which is the connection point between the positive-electrode-side capacitor and the negative-electrode-side capacitor. The control unit includes: a modulation factor calculator that calculates the modulation factor of the inverter on the basis of the DC voltage and an output voltage command value; a gate signal generator that compares the calculated modulation factor and a carrier signal and generates a gate signal necessary for on/off-driving of the switching element for generating a pulse train; and a gate signal allocation unit that adjusts the allocation of the gate signals so that the voltage of the positive-electrode-side capacitor and the voltage of the negative-electrode-side capacitor are balanced.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters

Abstract

This product quality analysis assistance system is applied to a steel plant. In a first process, a plurality of defective waveform patterns determined to be defective in quality are classified into at least one defective waveform pattern group on the basis of similarity. In a second process, a score of correlation with a condition based on product specifications and a process data waveform pattern is calculated for the defective waveform pattern group. In a third process, when the score of correlation indicating characteristics of the defective waveform pattern group is greater than a condition threshold, an input screen including a representative waveform pattern representing the defective waveform pattern group, information according to the score of correlation, and a factor and countermeasure input area is displayed on a monitor.

IPC Classes  ?

• G06Q 50/04 - Manufacturing

Abstract

This SCADA web HMI system draws an HMI screen including a first strip part disposed in a first zone and an extendable second strip part disposed in a second zone. The first strip part and the second strip part are drawn each drawing cycle shorter than the reception cycle of PLC signals. The tip position of the first strip part is calculated each drawing cycle from the time when a first PLC signal is received, on the basis of a transfer speed and an elapsed time included in the first PLC signal. The drawing size of the first strip part is set to the length from the entry side of the first zone to the tip position of the first strip part. Further, if the tip position of the first strip part has not reached the second zone when a second PLC signal is received, the drawing size of the first strip part is set to the zone length of the first zone.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Abstract

In the present invention, a SCADA web HMI system draws an HMI screen including a first rolled part disposed in a first zone and an extensible second rolled part disposed in a second zone. The first rolled part and the second material part are drawn in each drawing period, which is shorter than the PLC signal receiving period. The first rolled part tip position is calculated on the basis of the conveying speed and elapsed time included in the first PLC signal in each drawing period from the time the first PLC signal is received. The size of the drawn first rolled part is set to the length from the entry side of the first zone to the first rolled part tip position. If the first rolled part tip position has not reached the second zone when the second PLC signal has been received, the size of the drawn first rolled part is set to the length of the first zone.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Abstract

This electric motor control device comprises a signal identification unit and an overvoltage detection unit. The signal identification unit includes an optical isolator for converting electric signals supplied through a terminal to which an external device is connected, and furthermore includes a switch for opening a connection circuit connected to the terminal. The overvoltage detection unit is formed so as to open the switch when the voltage applied to the connection circuit exceeds a threshold voltage.

IPC Classes  ?

• H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load

Abstract

Provided is an insulation tape comprising a base layer, two adhesive layers, and two reinforcement layers. The base layer includes a first surface and a second surface on the opposite side of the first surface. The two adhesive layers contain nano-sized silica particles and are overlaid on the first surface and the second surface, respectively. The two reinforcement layers are provided for the first surface and the second surface, respectively, and are adhered to the base layer by the adhesive layers.

IPC Classes  ?

• H02K 3/30 - Windings characterised by the insulating material

Abstract

In the present invention, first and second communication lines (L1, L2) connect, with daisy chains, a plurality of control circuits respectively corresponding to a plurality of UPS modules (U1-U5). The transmission direction of data in the second communication line (L2) is reverse of the transmission direction of data in the first communication line (L1). First communication terminals (Tin1, Tout1) of each of the UPS modules receive, via the first communication line (L1), detection values of AC output currents of the other USP modules and transmit a detection value of an own AC output current to respective other control circuits. Second communication terminals (Tin2, Tout2) of each of the UPS modules receive, via the second communication line (L2), detection values of AC output currents of the other USP modules and transmit a detection value of an own AC output current to the respective other control circuits. The control circuits each generate a current command value on the basis of the detection values of the own AC output currents and the detection values of the AC output currents of the other UPS modules received by the first and/or second communication terminals.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is an electric power conversion apparatus comprising: a main circuit unit that converts electric power of a distributed power supply into AC power corresponding to an electric power system; and a control unit that controls an operation of the main circuit unit. The control unit has: an estimated value computation unit that computes an estimated value of a resistance component of system impedance of the electric power system, an estimated value of a reactance component of the system impedance, and an estimated value of a voltage value of an infinite busbar power system, on the basis of an active power value at a connection point to the electric power system, a reactive power value at the connection point, and a voltage value at the connection point; and a reactive power computation unit that computes a reactive power command value of reactive power that is supplied to the electric power system, on the basis of the respective estimated values. The estimated value computation unit has a first estimation unit that computes the respective estimated values using a Kalman filter corresponding to a nonlinear system, and a second estimation unit that computes the respective estimated values using Newton's method. Thus, an electric power conversion apparatus, a control device, and a distributed power supply system that can more appropriately reduce voltage fluctuations at a connection point of a distributed power supply are provided.

IPC Classes  ?

• H02M 7/48 - 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
• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

Provided is a photovoltaic power generating system comprising: a plurality of solar cell panels; a plurality of power conversion devices which convert DC power supplied from the plurality of solar cell panels into AC power and supply the AC power to electric power systems; and a control device for controlling the operation of the plurality of power conversion devices. The control device has a total output value calculation unit for calculating a total effective power value representing the magnitude of effective power that can be outputted currently from all of the plurality of power conversion devices; a difference calculation unit for calculating a difference between a total upper limit command value and the total effective power value and dividing the difference by the number of the plurality of power conversion devices, thereby calculating a difference for each of the plurality of power conversion devices; and an upper limit command value calculation unit for adding the difference per power conversion device to an effective power value, thereby calculating an individual upper limit command value for each of the plurality of power conversion devices. Accordingly, it is possible to provide a photovoltaic power generating system and a control device which can inhibit excessive lowering of the total value of effective power to be supplied to electric power systems from a plurality of power conversion devices.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

Provided is a switching device for charging equipment, the switching device comprising: a switching unit that switches connections between each of a plurality of power sources and each of a plurality of charging stations; and a control unit that controls the switching of connections by the switching unit. The switching unit has a plurality of first switching elements provided to correspond to the plurality of power sources, respectively, and a plurality of second switching elements that are provided between each of the plurality of first switching elements and each of the plurality of charging stations, and allow direct-current power, which is supplied from the plurality of power sources through the plurality of first switching elements, to be selectively supplied to each of the plurality of charging stations. The control unit controls switching of each of the plurality of first switching elements and the plurality of second switching elements, thereby controlling the switching of connections by the switching unit. Thus, provided is the switching device for charging equipment that can appropriately switch output locations while curbing increases in the cost of equipment.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters

Abstract

Provided is a power supply system for an autonomous system comprising: a plurality of power supply devices; a plurality of voltage-source voltage control power conversion devices that are connected in parallel with an autonomous system, converts the power supplied from the plurality of power supply devices to an AC power corresponding to the autonomous system, and supplies the converted AC power to the autonomous system; and a control device that controls the power conversion operations of the plurality of power conversion devices. The control device calculates the plurality of active power command values of the plurality of power conversion devices according to active powers required in the autonomous system and calculates the plurality of reactive power command values of the plurality of power conversion devices according to reactive powers required in the autonomous system. The plurality of power conversion devices perform voltage control operations so as to output the active powers according to the active power command values and output the reactive powers according to the reactive power command values. This provides the power supply system for the autonomous system capable of stably supplying power to the autonomous system even when the plurality of voltage-source voltage control power conversion devices are operated in parallel.

IPC Classes  ?

• H02M 7/48 - 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
• 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

Abstract

First to third capacitors (UC1-UC3) each have an identical rectangular parallelepiped shape. First surfaces (P1) of each of the rectangular parallelepiped capacitors each have first and second sides perpendicular to each other, second surfaces (P2) each have the second and third sides perpendicular to each other, and third surfaces (P3) each have the first and third sides perpendicular to each other. The length of the first sides is two times or greater than and less than three times the length of the third sides. The first and second capacitors (UC1, UC2) are disposed so that the first surfaces (P1) are perpendicular to an installation surface (10), the first surfaces (P1) face each other with a gap therebetween, and the second surfaces (P2) are horizontal to the installation surface (10). The third capacitor (UC3) is disposed so that the first surfaces (P1) face the second surfaces (P2) of the first and second capacitors (UC1, UC2) with a gap therebetween, and the third surfaces (P3) are flush with the third surfaces (P3) of the first and second capacitors (UC1, UC2).

IPC Classes  ?

• H02M 7/48 - 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

Abstract

A tandem rolling system according to the present invention makes it possible to reduce fluctuations in the plate thickness on the outlet side of the final stand. The tandem rolling system comprises a final target mass flow computation unit and an upstream mass flow control unit. The final target mass flow computation unit multiplies the actual value of the speed of a material to be rolled, measured on the outlet side of an Nth stand (N ≥ 3) that is the final stand, by a final-stand-outlet-side plate thickness target value defined in advance according to product specifications of the material to be rolled, and calculates a final target mass flow, which is the outlet-side mass flow of the final stand. The upstream mass flow control unit controls an actuator provided to an ith stand (1 ≤ i ≤ N - 2) or an actuator provided upstream relative to the ith stand, such that the outlet-side mass flow for the ith stand matches the final target mass flow.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• B21B 37/18 - Automatic gauge control
• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/46 - Roll speed or drive motor control

Abstract

This uninterruptible power supply system comprises: a selection unit (27) that selects, from among a plurality of uninterruptible power supply devices (U), the number of uninterruptible power supply devices required in order to supply power to a load (73). Each uninterruptible power supply device executes a driving operation in which power is supplied to the load in a case where a host device is selected, executes a standby operation in which power is not supplied in a case where the host device is not selected, and executes a diagnostic operation to diagnose whether a predetermined part (5, 8, 9) in the host device has failed during the standby operation. The selection unit changes the uninterruptible power supply devices to be selected so as to equalize the operating times of the plurality of uninterruptible power supply devices.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

According to the present invention, at least one first electric power converter among a plurality of electric power converters (81 to 85) has a charging mode in which alternating current electric power supplied from an alternating current power source (71) via a switch (2) is converted into direct current electric power and stored in a corresponding electrical storage device (73), and a standby mode in which a control signal for electric power conversion is generated and standby for electric power conversion is performed. In a case in which alternating current voltage from the alternating current power source (71) is normal, a control device (10) turns the switch (2) on, and alternately switches at least one first electric power converter between the charging mode and the standby mode. In a case in which the alternating current voltage is not normal, the control device (10) turns the switch (2) off, and also controls each of the plurality of electric power converters (81-85) so as to convert direct current electric power of the electrical storage device (73) into alternating current electric power and to perform supply thereof to a load (72).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A SCADA web HMI client device according to the present invention comprises a processor and memory. The memory stores screen operation authority information, exception information, and image data of an HMI screen for monitoring an industrial plant, which have been received from a web server. The screen operation authority information stipulates, for each web browser, whether operation of the HMI screen is permitted. The exception information stipulates, for each web browser, whether operation of specific operation parts on the HMI screen is permitted. The processor executes a screen rendering process for rendering the HMI screen on the web browsers, wherein the operation permissions and denials thereof stipulated in the exception information are preferentially applied to said specific operation parts on the HMI screen, and the operation permissions and denials thereof stipulated in the screen operation authority information are applied to operation parts other than said specific operation parts on the HMI screen.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

An uninterruptible power supply system (100) comprises a plurality of UPSs, a plurality of switches for connecting the plurality of UPSs in parallel with loads, and a connection circuit (40). The UPSs each include: a power converter (3) for generating an AC voltage having a predetermine frequency; and an output terminal (T3) for outputting the AC voltage generated by the power converter. The plurality of switches include a first switch (21b) connected between the output terminal of a first UPS (11) and the loads, a second switch (22b) connected between the output terminal of a second UPS (12) and the loads, and a third switch (23b) connected between the output terminal of a third UPS (13) and the loads. The connection circuit (40) is configured so that a reactor (41) is connected between the output terminal of the first UPS and the output terminal of the second UPS in a state in which the first and second switches are turned off and the third switch is turned on.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02M 7/48 - 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

Abstract

The present disclosure relates to a tail end squeezing prevention device for a tandem rolling mill wherein a material to be rolled undergoes rolling in N (N≥2) consecutive rolling stands. Each ith rolling stand (1≤i≤N) in the tandem rolling mill has an ith roll bender device for reducing the material to be rolled with a preset roll bender pressure. During the interval between the release of the tail end of the material being rolled from one specified jth rolling stand (1≤j≤N-1) and release from the Nth rolling stand, the tail end squeezing prevention device continuously reduces the roll bender pressure in the j+1th to the Nth roll bender devices downstream from the jth rolling stand.

IPC Classes  ?

• B21B 33/02 - Preventing fracture of rolls
• B21B 37/38 - Control of flatness or profile during rolling of strip, sheets or plates using roll bending
• B21B 37/68 - Camber or steering control for strip, sheets or plates, e.g. preventing meandering
• B21B 37/72 - Rear end control; Front end control

Abstract

A drive system according to an embodiment of the present invention comprises an initial phase command generation unit, a rotor phase detection unit, and a drive control unit. The initial phase command generation unit generates a phase command value corresponding to the initial phase of a rotor prior to start-up of a synchronous motor. The rotor phase detection unit detects and outputs the phase of the rotor. The drive control unit use the phase command value to control driving of the synchronous motor. The initial phase command generation unit uses the detection result of the phase of the rotor, as detected by the rotor phase detection unit prior to the start-up, to adjust the phase command value to approximate the phase of the rotor in the detection result.

IPC Classes  ?

• H02P 6/20 - Arrangements for starting

Abstract

A drive system according to an aspect of an embodiment of the present invention is provided with a rotor phase detection unit, a phase estimation unit, a phase-error-adjusting unit, and a drive control unit. The rotor phase detection unit detects the phase of the rotor of a synchronous motor and outputs phase information indicating the detected phase. The phase estimation unit generates an initial phase command prescribing a position of the rotor of the synchronous motor, using a correction amount for correcting a phase error. The phase-error-adjusting unit generates the correction amount for adjusting a phase error of an initial magnetic pole position of the synchronous motor, using the phase error of the initial phase command at a timing prescribed by the phase information. The drive control unit controls driving of the synchronous motor, using the initial phase command having the phase error adjusted.

IPC Classes  ?

• H02P 6/20 - Arrangements for starting

Abstract

The purpose of the present disclosure is to provide an active gas generation apparatus that can uniformly jet out active gas with a constant radical concentration. Further, in the active gas generation apparatus of the present disclosure, a unidirectional electric discharge structure (61s) satisfies the following disposition requirements (a) to (c). Requirement (a) is a requirement that a region in which a corresponding metal electrode (10p) and a corresponding metal electrode (20p) overlap each other in a corresponding gap region (23p), as seen in a plan view, serves as a corresponding electric discharge space (6p). Requirement (b) is a requirement that a plurality of gas supply holes (12) provided in a corresponding gas supply region (12Rp) and the corresponding gap region (23p) overlap each other, as seen in a plan view. Requirement (c) is a requirement that the plurality of gas supply holes (12) provided in the corresponding gas supply region (12Rp) and a plurality of gas jetting holes (22) provided under the corresponding gap region (23p) are, as seen in a plan view, disposed opposite to each other on a one-to-one basis along the Y direction, with the corresponding electric discharge space (6p) sandwiched therebetween.

IPC Classes  ?

• H05H 1/24 - Generating plasma
• C23C 16/509 - Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition (CVD) processes characterised by the method of coating using electric discharges using radio frequency discharges using internal electrodes

Abstract

The purpose of the present disclosure is to provide an active gas generation apparatus that has achieved an increase in the volume of an electric discharge space without increasing the required applied voltage. Further, in the active gas generation apparatus (51) of the present disclosure, a high-voltage application electrode part (1) has a laminate structure formed of an electrode dielectric film (11) and a metal electrode (10), and a ground potential electrode part (2) has a laminate structure formed of an electric discharge field adjustment film (30) and a metal electrode (20). A space between the electrode dielectric film (11) of the high-voltage application electrode part (1) and the electric discharge field adjustment film (30) of the ground potential electrode part (2) is defined as an electrode opposing space. In the electrode opposing space, regions in which the metal electrode (10) and the metal electrode (20) overlap each other, as seen in a plan view, serve as electric discharge spaces (4). The electric discharge field adjustment film (30) has a plurality of protrusions (30t) protruding upwardly so that the gap length in the electric discharge spaces (4) is short.

IPC Classes  ?

• H05H 1/24 - Generating plasma
• B01J 19/08 - Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor

Abstract

This uninterruptible power supply device (100) comprises a housing (110) that has a rectangular shape, a plurality of power converting units (20), and a bus-bar unit (130) for connecting the plurality of power converting units (20) to each other in a parallel manner. The plurality of power converting units (20) are stacked in the vertical direction and contained inside the housing (110). The bus-bar unit (130) is disposed facing the rear surface of the housing (110) inside the housing (110). The bus-bar unit (130) includes a plurality of bus-bars that extend vertically, at least one support member that supports the plurality of bus-bars so as to be separated from each other in the horizontal direction, and at least one fixing member that removably fixes each support member to the housing (110).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• G01F 1/30 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter for fluent solid material

Abstract

The purpose of the present disclosure is to provide an ultrasonic bonding apparatus with which it is possible to precisely bond a lead wire onto a substrate. In this ultrasonic bonding apparatus (100), an ultrasonic bonding apparatus control panel (20) controls the actions of a lead placement unit (4) and a tension adjustment unit (5) having a dancer roller (53), and executes a bonding tension control process. The bonding tension control process includes a step for executing re-winding driving to re-wind a lead wire (81) within a lead cassette (40) when the dancer roller (53) arrives at a lower-limit adjustment position (H12) within a tension adjustment range (B5), and a step for executing feed-out driving to feed out the lead wire (81) from the lead cassette (40) when the dancer roller (53) arrives at an upper-limit adjustment position (H11) within the tension adjustment range (B5).

IPC Classes  ?

• B23K 20/10 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding

Abstract

This reactive power control device comprises: a voltage acquiring unit for detecting system voltage and DC voltage; a modulation factor calculation unit for calculating a modulation factor using the system voltage and the DC voltage acquired by the voltage acquiring unit; a reactive power command acquiring unit for acquiring a first reactive power command from a higher-level device; a dead band region determination unit for determining whether the first reactive power command acquired by the reactive power command acquiring unit is a dead band level or not; a reactive power command calculation unit which, when it is determined by the dead band region determination unit that the first reactive power command is not the dead band level, calculates a second reactive power command on the basis of the modulation factor calculated by the modulation factor calculation unit by limiting or compensating the first reactive power command; and a reactive power command output unit which, when the second reactive power command is calculated by the reactive power command calculation unit, outputs the second reactive power command and, when the second reactive power command is not calculated by the reactive power command calculation unit, outputs the first reactive power command.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

This uninterruptible power source device is provided inside of a housing and comprises: a converter (6) which converts first AC power from a commercial AC power source (21) to DC power; an inverter (10) which converts the DC power generated by the converter (6) or DC power supplied from a power storage device (23) into second AC power, and supplies the AC power to a load (24); a cooling fan (51) for lowering the temperature inside of the housing by continuously rotating at a rated rotation speed; and a control device (19) which diagnoses deterioration in the cooling fan (51) on the basis of a fan electric current flowing to the cooling fan (51) during an initial operation of the uninterruptible power source device and electrical current flowing to the cooling fan (51) during diagnosis.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

The purpose of the present disclosure is to provide a mist flow rate measurement device with which it is possible to precisely derive the flow rate of raw-material mist. In this mist flow rate measurement device, a camera (5) executes an imaging process for reflected light (L2) using at least part of a mist flow-through region, through which a mist-containing gas (G3) flows within transparent piping (10), as an imaging subject region, and acquires imaging information (S5). A mist flow rate computation unit (16) executes a mist flow rate computation process on the basis of the imaging information (S5). The mist flow rate computation process includes: a total value computation process for deriving a total brightness value, which is the total of a plurality of brightness values indicated by the imaging information (S5); and a flow rate calculation process for deriving the flow rate of a raw-material mist (3) from the total brightness value.

IPC Classes  ?

• G01F 1/74 - Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
• G01F 1/00 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow

Abstract

The purpose of the present disclosure is to provide a mist flow rate measurement device capable of finding the flow rate of a raw material mist with high accuracy. In the mist flow rate measurement device of the present disclosure, an upstream tubing (7), a large-diameter transparent tubing (31), and a downstream tubing (8) are combined to constitute an external discharge tubing. Part of a mist circulation region of the large-diameter transparent tubing (31) constitutes a region to be imaged by a mist-imaging camera. An inner diameter (D31) of the large-diameter transparent tubing (31) is set to a value greater than an inner diameter (D7) of the upstream tubing (7) and an inner diameter (D8) of the downstream tubing (8). Namely, the large-diameter transparent tubing (31), the upstream tubing (7), and the downstream tubing (8) have an inner-diameter size relationship of {D31>D7=D8}.

IPC Classes  ?

• G01F 1/74 - Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
• G01F 1/00 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow

Abstract

This power conversion device is provided with a converter main circuit, and a control unit. The converter main circuit includes a controllable semiconductor switch, and converts alternating-current power to direct-current power through switching of the semiconductor switch. The control unit causes the semiconductor switch to switch in a cycle of a first frequency in the case of a first situation where current flowing through the converter main circuit is lower than a threshold value established within an allowable operating range of the semiconductor switch, and causes the semiconductor switch to switch in a cycle of a second frequency higher than the first frequency in the case where a second situation arises in which the current flowing through the converter main circuit is greater than the threshold value.

IPC Classes  ?

• H02M 7/12 - 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

Abstract

An uninterruptible power supply device comprising a housing (120) that accommodates components of the uninterruptible power supply device, a cooling fan (71) that cools the inside of the housing (120), a part of electrical components which are arranged in a first block (41) inside the housing (120) and form the uninterruptible power supply device (1), another part of electrical components which are arranged in a second block (42) inside the housing (120) and form the uninterruptible power supply device (1), and a partition structure (30) disposed adjacent to an exhaust side of the second block (42) and configured to be able to adjust the flow of air circulating in the first block (41) and the second block (42). The part of electrical components comprise an electrical component through which an alternating current flows. The other part of electrical components comprise an electrical component through which a direct current flows.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A first current detector (CT1) detects the output current of a module type uninterruptible power supply device. A plurality of first control circuits (6) are provided corresponding to each of a plurality of power conversion modules. The power conversion modules each include resistance elements (11) and second switches (S5). The second switches (S5) connect the first current detector (CT1) and the resistance elements (11) in parallel with each other in an on-state. The first control circuits (6) are each configured so as to turn on the second switches (S5) when bringing the corresponding power conversion module into an operation state and, meanwhile, to turn off the second switches (S5) when bringing the power conversion module into a stop state. The first control circuits each detect the shared current of the corresponding power conversion module on the basis of the currents flowing through the resistance elements when the second switches (S5) are in the on-state. The first control circuits each control a power converter so that the output current of the power conversion module becomes the shared current.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A main controller (22) comprises a first programmable device (40), a device (42), and a first selector (44). Each controller (66) comprises a second programmable device (50) and a second selector (52). The second programmable device (50) comprises a memory (502) and a processor (500). The first selector (44) connects the first programmable device (40) to a serial communication line (15) at the time of operating an uninterruptible power supply device, and connects the device (42) to the serial communication line in response to the reception of an execution instruction for update processing by the device (42). The second selector (52) connects the processor (500) to the serial communication line (15) at the time of operating the uninterruptible power supply device, and connects the memory (502) to the serial communication line (15) in response to the reception of the execution instruction from the first programmable device (40) by the processor (500) during the operation of the uninterruptible power supply device.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A converter control unit (8) of this thyristor starting device includes: a current control unit (14) for generating a voltage command value of the output voltage of a converter (1) by performing a control calculation using the integral element of a DC current deviation with respect to a current command value; a correction unit (15) for adding a correction value to the voltage command value; and a control angle calculation unit (16) for calculating a phase control angle of a thyristor of the converter (1) on the basis of the voltage command value to which the correction value is added. In an intermittent commutation mode, the correction value is set so as to become larger as the rotational speed of a synchronous machine increases.

IPC Classes  ?

• 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

Abstract

This power conversion device submodule comprises: IGBTs (11a to 14a, 11b to 14b); drive circuits (40a, 42a, 40b, 42b) for driving the IGBTs (11a to 14a, 11b to 14b); laminated bus bars (22a, 22b) mounted with the IGBTs (11a to 14a, 11b to 14b); substrates (23a, 24a, 23b, 24b) mounted with the drive circuits (40a, 42a, 40b, 42b); a housing frame (55) for housing the IGBTs (11a to 14a, 11b to 14b), the drive circuits (40a, 42a, 40b, 42b), the laminated bus bars (22a, 22b), and the substrates (23a, 24a, 23b, 24b); and separation frames (52a, 52b) for separating a space in which the drive circuits (40a, 42a, 40b, 42b) and the substrates (23a, 24a, 23b, 24b) are disposed from a space in which the IGBTs (11a to 14a, 11b to 14b) and the laminated bus bars (22a, 22b) are disposed.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

This arc furnace equipment comprises an arc furnace, a camera, and an information-processing device. The arc furnace causes scrap to melt using heat generated by an arc discharge between the scrap and an electrode. The camera captures an image of the scrap placed in the arc furnace. The information-processing device: inputs, into an arc interruption prediction model, the disposition and sparseness/denseness information regarding the scrap based on image data acquired from the camera, and control record data relating to the electrode after melting has commenced; and predicts the occurrence of an arc interruption caused by a short-circuit between the scrap and the electrode due to collapse of the scrap during melting.

IPC Classes  ?

• F27B 3/28 - Arrangement of controlling, monitoring, alarm or like devices
• H05B 7/152 - Automatic control of power by electromechanical means for positioning of electrodes

Abstract

A drive system according to one mode of an embodiment of the present invention is provided with: a first phase estimation unit; a second phase estimation unit; a state determination unit; and a drive control unit. The first phase estimation unit generates a first phase obtained by estimating a phase of a rotor by using an initial phase in a startup stage of a synchronous motor as a reference. The second phase estimation unit generates a second phase obtained by estimating a phase of the rotor being rotating, on the basis of an operation state of the synchronous motor. The state determination unit determines the operation state of the synchronous motor. The drive control unit controls the drive of the synchronous motor using either one of the first phase and the second phase on the basis of a determination result of the operation state of the synchronous motor. The first phase estimation unit corrects the first phase by using a detection result for the rotor position detected in a period from the start of a startup process for the synchronous motor to the success of the startup.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position

Abstract

Provided is a wind pressure shutter having a high waterproof property and a high dust resistance during storm, a low cost, and a low failure risk. The wind pressure shutter comprises a first rotation shaft, a first door, a second rotation shaft, and a second door. The first door is rotatably suspended from the first rotation shaft, closes a flow path at a vertical position, and opens the flow path at a position rotated from the vertical position. The second door is rotatably attached to the second rotation shaft, closes the flow path and allows the upstream side end portion thereof to prevent the first door from rotating at a horizontal position, and opens the flow path at a position rotated from the horizontal position. When a negative pressure occurs in the downstream from the second door, the second door rotates to open the flow path, the upstream side end portion departs from the first door, and then the first door rotates to the downstream side to open the flow path.

IPC Classes  ?

• H02B 1/56 - Cooling; Ventilation

Abstract

According to the present invention, a switch device (52) includes a switch (SW) configured to cause an output terminal of a main circuit (30) to be short-circuited by turning on the switch. Upon receiving an on-command for the switch (SW) from the control device (120), a control circuit (33) is configured to turn the switch (SW) on and transmit the on/off state of the switch (SW) to the control device (120). Upon detecting an abnormality between a cell (10) of a plurality of cells (10) and a control circuit (32), the control device (120) transmits an on-command for the switch (SW) to the control circuit (33) in the cell (10) in which the abnormality has been detected.

IPC Classes  ?

• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters

Abstract

A cooler according to an embodiment of this invention comprises a contact surface, a flow path formation unit, a supply unit, a discharge unit, and at least one retention unit. The contact surface contacts an object to be cooled. A flow path through which a refrigerant circulates is formed in the flow path formation unit. The supply unit supplies the refrigerant to the flow path. The discharge unit discharges the refrigerant from the flow path. The retention unit changes the cross-sectional area of the flow path so as to promote local retention of the refrigerant in the flow path.

IPC Classes  ?

• F28F 13/08 - Arrangements for modifying heat transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
• H01L 23/36 - Selection of materials, or shaping, to facilitate cooling or heating, e.g. heat sinks
• H01L 23/427 - Cooling by change of state, e.g. use of heat pipes
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

This power conversion device comprises: a three-phase voltage-type inverter for converting a DC voltage from a DC power supply to a three-phase AC voltage and outputting the three-phase AC voltage to a power system; an addition value calculation unit for deriving an addition value of the maximum phase and the minimum phase of a first output voltage command signal that is a sinusoidal three-phase output voltage command signal in the three-phase AC voltage; an effective value calculation unit for deriving an effective value of an output voltage command on the basis of the three-phase first output voltage command signal; a coefficient determination means for determining a coefficient with which the power loss of the three-phase voltage-type inverter is minimized, on the basis of the effective value derived by the effective value calculation unit, the value of the DC voltage, and an output power factor command that corresponds to an output request directed to the power system; a control quantity calculation unit for deriving a control quantity by multiplying the addition value derived by the addition value calculation unit and the coefficient determined by the coefficient determination means; an output voltage command signal control unit for deriving a second output voltage command signal that is obtained by subtracting the control quantity derived by the control quantity calculation unit from each three-phase first output voltage command signal; and a PWM control unit for generating a gate signal on the basis of the second output voltage command signal derived by the output voltage command signal control unit and a triangle-wave-form carrier signal.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

This power conversion device comprises a direct current-side terminal and a heat dissipation member. The heat dissipation member is electrically conductive. The heat dissipation member is provided to the direct current-side terminal.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

A fan unit (60) is arranged on the upper surface of a housing (50) and includes a fan, a frame member (66), and a support member. The frame member (66) is arranged so as to surround the outer periphery of an opening formed in the upper surface (50A) of the housing (50). The support member supports the fan above the opening while fixed to the frame member (66). A gap is formed between the lower edge of a first surface (66A) of the frame member (66) and the upper surface (50A) of the housing (50). A first closing member (70) is connected so as to be vertically slidable with respect to the first surface (66A) of the frame member (66). The first closing member (70) is configured so as to close the gap while in contact with the upper surface (50A) of the housing (50). At least one second closing member (90) is configured so as to be inserted into the interior of the frame member via the gap while the gap is exposed and thereby close the opening in the upper surface (50A) of the housing (50).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02M 7/48 - 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

Abstract

This control device is a control device of a power conversion device having, in an output side of an inverter, at least one AC capacitor that is separated from a circuit in the case of a failure, and comprises: a current component extraction unit which acquires a value of a current flowing through the AC capacitor at the time of a synchronous control that synchronizes an output voltage of the inverter with a system voltage of a system side, the synchronous control being performed at the time of starting the power conversion device in a state where a system-side AC switch is open, and which extracts a value of the current component of which a frequency is synchronized with the output voltage of the inverter among current values; a failure determining unit which compares the magnitude of the current component value extracted by the current component extraction unit and a prescribed decision value, and, in the case where the current component value is smaller than the prescribed decision value, determines a failure of the AC capacitor; and a failure information alarm unit which issues an alarm on failure information about the AC capacitor when the failure determining unit determines the failure of the AC capacitor at the time of the synchronous control.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

This excessive temperature detection system detects a temperature anomaly of a dry-type transformer (hereinafter referred to as transformer) cooled by means of a cooling device. The excessive temperature detection system comprises a temperature determining unit. The temperature determining unit determines and outputs the temperature anomaly of the transformer in place of a determination condition of the temperature anomaly of the transformer according to whether the operation states of the cooling device are in operation or are stopped.

IPC Classes  ?

• H01F 27/00 - MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - Details of transformers or inductances, in general
• H01F 27/08 - Cooling; Ventilating

Abstract

An AC/DC converter (42) converts an AC voltage supplied from an AC power supply (30) or an AC voltage supplied to a load (31) into a first DC power supply voltage. A power supply line (16) transmits the first DC power supply voltage to a plurality of power conversion modules (P) and a bypass module (B0). The bypass module (B0) includes: a switch (20) connected between the AC power supply (30) and the load (31); and a first control device (28) operating by receiving an operation power supply voltage based on the first DC power supply voltage and thereby controlling the on/off of the switch (20). The power conversion modules (P) each include: a power converter converting the power supplied from the AC power supply (30) or a power storage device (32) into an AC power and supplying the AC power to the load (31); and a second control device (14) operating by receiving an operation power supply voltage based on the first DC power supply voltage and thereby controlling the power converter.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A drip prevention structure for a fan according to this embodiment comprises a housing, at least one opening/closing member, and a restricting member. The housing accommodates the fan. The at least one opening/closing member opens and closes a ventilation aperture in accordance with the blowing force of the blowing of the fan, said ventilation aperture being formed in the housing. The restricting member restricts the extent to which the ventilation aperture is opened by the opening/closing member.

IPC Classes  ?

• F04D 29/46 - Fluid-guiding means, e.g. diffusers adjustable
• F04D 29/56 - Fluid-guiding means, e.g. diffusers adjustable

Abstract

According to an embodiment of the present invention, provided is a speed control device for an electric motor, said device comprising: a first computation means for supplying a first speed reference to a first variable speed control device that controls the speed of a first electric motor which drives a table roll of a first transport table; and a second computation means. The second computation means is for: supplying a second speed reference to a second variable speed control device that controls the speed of a second electric motor which drives a table roll of a second transport table disposed downstream of the first transport table; calculating the transport speed of a transported rolled material as a target transport speed; calculating a fastest acceleration/deceleration time on the basis of actual speed data of the second electric motor, the target transport speed, and a pre-set electric motor parameter; generating a speed reference pattern on the basis of the actual speed data, the target transport speed, and the fastest acceleration/deceleration speed time; and supplying the generated speed reference pattern to the second variable speed control device as the second speed reference.

IPC Classes  ?

• B21B 39/12 - Arrangement or installation of roller tables in relation to a roll stand

Abstract

This busbar module is disposed across a plurality of housings and distributes DC power to smoothing capacitors and power conversion units. The busbar module comprises a first conductor and a second conductor. The first conductor is applied to either a DC first electrode or a DC second electrode. The second conductor is connected in parallel with the first conductor. The first conductor includes a first flat plate portion formed with a first thickness in a cross-section vertical to the extending direction. The second conductor includes a second flat plate portion having a bent cross-section forming a predetermined angle in a cross-section vertical to the extending direction and formed with a second thickness thinner than the first thickness.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

The abnormality detection device according to one embodiment is an abnormality detection device for detecting an abnormality in a rolling system for rolling a material according to a prescribed process, the abnormality detection device comprising a pre-process feature determination unit for determining whether or not the material prior to the prescribed process satisfies a prescribed feature, a post-process feature determination unit for determining whether or not the material after the prescribed process satisfies the prescribed feature, an intervention manipulated variable extraction unit for extracting a manipulated variable of an intervention by an operator with respect to the prescribed process, a determination unit for determining that an abnormality has occurred in the prescribed process when at least the post-process feature determination unit has determined that the prescribed feature is satisfied and the manipulated variable extracted by the intervention manipulated variable extraction unit exceeds a predetermined manipulated variable, and an output unit for outputting a result determined by the determination unit.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Abstract

A power conversion device according to the present invention comprises a first relay unit, one or more second relay units, and a safety control unit. The first relay unit comprises a first logical processing unit that sends, to an upstream side, a response signal from a first power conversion unit and a response signal from a further downstream side than a host first relay unit. Each of the one or more second relay units includes a second logical processing unit that sends, to a further upstream side than the one second relay unit, a response signal from one second power conversion unit of the one or more second power conversion units and a response signal from a further downstream side than the one second relay unit. The safety control unit is disposed at an upstream side of the first logical processing unit, implements functional safety control of the first power conversion unit and the one or more second power conversion units by sending a control command for functional safety control to the first relay unit, and monitors the state of functional safety control of the first power conversion unit and the state of functional safety control of the one or more second power conversion units.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

A partition member (150) is located in a gap part between a back surface of a housing (110) and outer surfaces of a plurality of units (20, 30). A first partition part (150A) is located at a boundary part of two units adjacent to each other in the vertical direction and extends in the left-right direction. Second and third partition parts (150B, 150C) are connected to respective ends of the first partition part (150A) in the left-right direction, and extend toward a top surface (110A). The air discharged from a first unit group above the first partition part (150A) flows through a first ventilation path and is guided to the top surface (110A). The air discharged from a second unit group below the first partition part (150A) flows through a second ventilation path and is guided to the top surface (110A). A first fan unit (120) is located at a downstream end of the first ventilation path, and second and third fan units (122, 124) are located at downstream ends of a second ventilation path.

IPC Classes  ?

• H02M 7/48 - 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

Abstract

According to one aspect of the present invention, a power conversion device that comprises a 3-level TNPP circuit is characterized by having a voltage detection unit that detects the voltage between a direct-current positive electrode and a direct-current neutral point, the voltage between the direct-current neutral point and a direct-current negative electrode, and the voltage between the direct-current positive electrode and the direct-current negative electrode, a test pulse outputting unit that, when the voltages detected by the voltage detection unit have risen above a prescribed threshold value, outputs a test pulse to an inside switching element that is connected in the forward direction from the direct-current neutral point toward an alternating-current output terminal, and a determination unit that, when the voltage between the direct-current neutral point and the direct-current negative electrode as detected by the voltage detection unit drops when the test pulse outputting unit has outputted the test pulse to the inside switching element that is connected in the forward direction from the direct-current neutral point toward the alternating-current output terminal, determines that a short circuit failure has occurred at an outside switching element that is connected to the direct-current negative electrode.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters

Abstract

A drawing creation device generates HMI configuration data for a system monitoring screen from a network configuration diagram drawn using drag and drop. An HMI server device executes a system monitoring process by applying HMI configuration data to a predetermined server runtime library, and transmits a display signal according to the communication state of the device to be monitored. An HMI client device draws a system monitoring screen on the web browser, and changes the display state of the parts arranged on the system monitoring screen in response to the received display signal. According to the present invention, the system monitoring function of an industrial plant can be graphically implemented via non-programming.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

This SCADA web HMI client device executes a plurality of web browsers communicating with a web server. A first web browser is displayed on a first monitor and renders an HMI screen for monitoring and controlling an industrial plant. A second web browser is displayed on a second monitor, and renders an HMI screen. An operation rights table is acquired from the web server. In the operation rights table, when operation of the HMI screen is not allowed for the first web browser, operation parts arranged in the HMI screen of the first web browser are rendered in an inoperable state. In the operation rights table, when operation of the HMI screen is allowed for the second web browser, operation parts arranged in the HMI screen of the second web browser are rendered in an operable state.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• G06F 3/14 - Digital output to display device