A magnetic field apparatus includes a main magnet that generates a magnetic field with respect to an armature, a member made of a soft magnetic material and disposed adjacent to an end surface of the main magnet on a side opposing the armature, an auxiliary magnet that increases a magnetic flux of a magnetic pole of the main magnet on the side opposing the armature and disposed adjacent to the main magnet and the member in a relative moving direction between the magnetic field apparatus and the armature, and a restricting part that restricts the magnetic flux of the main magnet passing through an end surface of the member along a third direction that is perpendicular to both a first direction in which the main magnet and the armature oppose each other, and a second direction corresponding to the relative moving direction between the magnetic field apparatus and the aLmature.
H01F 7/08 - Electromagnets; Actuators including electromagnets with armatures
H01F 1/12 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
A magnetic field generator (1) including: a yoke (2); and a plurality of main magnetic pole magnets (3) and a plurality of secondary magnetic pole magnets (4), the main magnetic pole magnets and the secondary magnetic pole magnets comprising a rare earth sintered magnet, having magnetic pole orientations different from each other by substantially 90 , and being alternately arranged in a linear Halbach magnet array without gaps and fixed to the yoke, wherein near contact surfaces of the main magnetic pole magnets and the secondary magnetic pole magnets, a grain boundary diffusion layer (6, 8) is formed in which at least one of Dy or Tb being heavy rare earth elements or a compound of at least one of the Dy or the Tb is diffused into internal grain boundaries from the contact surfaces.
ARMATURE, LINEAR MOTOR, METHOD OF MANUFACTURING ARMATURE
An armature includes a plurality of cores arranged in a straight line and discontinuous with each other, a plurality of coils wound around each of the cores, and a holding section configured to hold the cores. At least one of the cores include division cores separate from each other and arranged in an axial direction thereof. Each of the division cores has a flange at a. contact surface thereof that is in contact with the holding section, and at least a portion of the contact surface protrudes toward the holding section to form the flange.
A linear motor includes an armature that includes a coil and a core made of a soft magnetic material, and a field magnet that includes a permanent magnet generating a magnetic field for the armature. One of the armature or the field magnet is a mover and the other of the armature or the field magnet is a stator, and the stator includes a first section and a second section. The armature and the field magnet are arranged such that the mover is interposed between the first and second sections, and at least one of the armature or the field magnet is configured to have an asymmetrical property between first and second magnetic actions. The first magnetic action is caused by the permanent magnet between the mover and the first section, and the second magnetic action is caused by the permanent magnet between the mover and the second section.
A permanent field magnet is disposed between two armatures parallel to each other, and includes a first field magnet section facing a first armature of the two armatures, and a second field magnet section facing a second armature of the two armatures that is different from the first armature. The first field magnet section includes a first main magnet that generates a magnetic field for the first armature and a first auxiliary magnet that increases magnetic flux of a magnetic pole of the first main magnet. The second field magnet section includes a second main magnet that generates a magnetic field for the second armature and a second auxiliary magnet that increases magnetic flux of a magnetic pole of the second main magnet. The first main magnet and the second main magnet, or the first auxiliary magnet and the second auxiliary magnet, are permanent magnets magnetized in the same direction.
A door opening/closing device is described that makes a person easily pull out an obstacle. A door opening/closing device includes: an opening/closing bar attached to one of doors, the opening/closing bar being configured to be actuated by an electric motor, the doors being opened and closed by the opening/closing bar being moved between an opened position and a closed position; a door closing state detecting part configured to detect whether the doors are in a closed state; a locking device configured to lock and unlock the doors; a lock pin configured to be moved to a locked position or an unlocked position by the locking device; an engaging member attached to the opening/closing bar, the engaging member including an engaging part configured to engage with the lock pin moved to the locked position, in a state in which the closed state is detected by the door closing state detecting part; a first spring provided between the opening/closing bar and the engaging member; and a locking control unit configured to issue a lock instruction to the locking device to cause the locking device to lock the doors, in a case in which the opening/closing bar is moved to the closed position by the electric motor and in which the closed state is detected by the door closing state detecting part.
Semiconductor switching elements are individually inserted between a plurality of power conversion units provided in parallel with each other through a DC link portion and a DC power supply unit for supplying DC power to each of the power conversion units to restrict the DC power supplied to the respective power conversion units. control circuit monitors a short-circuit current occurring in each of the power conversion units and turns off the semiconductor switching element connected to the power conversion unit where the short-circuit current flows to stop the power supplied to the power conversion unit.
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
A moving body drive apparatus with a shortened length in a direction of movement, drives a moving body in a linear direction by a drive source. The moving body includes: a relay rotating body movable in a travel direction of the moving body by the drive source, is rotatable in a direction perpendicular to the travel direction and relays drive power to the moving body; a rotation converting body stationary relative to the moving body, engages with an outer circumference of the relay rotating body, and converts movement of the relay rotating body, into rotation; and a conveyance linear body coupled to the moving body engages with the outer circumference of the relay rotating body and moves in the travel direction due to rotation of the relay rotating body while moving in the travel direction.
When there is a short circuit failure between the gate and emitter of a main switching element such as an IGBT, the temperature of a turn-on gate resistor or turn-off gate resistor is detected by a thermistor, and a drive circuit is protected by turning off a turn-on gate drive switching element or a turn-off gate drive switching element. Furthermore, instead of detecting the temperature of the turn-on gate resistor or turn-off gate resistor, a thermistor is connected in series with the turn-on gate drive switching element or turn-off gate drive switching element, the resistance change corresponding to a change in temperature of the thermistor is detected, and the drive circuit is protected by turning off the turn-on gate drive switching element or turn-off gate drive switching element.
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H03K 17/08 - Modifications for protecting switching circuit against overcurrent or overvoltage
H03K 17/56 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices
A control device for an electrically driven door is provided that can enhance the sensitivity of detection of a door pinch state and prevent a passenger from being pressed when the door pinch state occurs. The control device includes a driving force instruction value producing unit that outputs a driving force instruction value of the electrically driven door, a state observing unit that estimates a mechanical resistant force to a door driving system, a reference model that determines a dynamic characteristic of the electrically driven door to the mechanical resistant force estimated by the state observing unit, a gain compensator that computes a control compensation value that makes an output of the reference model coincide with an actual speed of the electrically driven door; and an adder that add the control compensation value computed by the gain compensator to the driving force instruction value outputted by the driving force instruction value producing unit.
A flowmeter includes: a transit time method unit having a sensor and a reception signal amplification control unit and a flow rate calculation unit which are connected to the sensor via a sensor selector switch; a pulse Doppler method having a reception signal amplification control unit and an integration calculation unit which are connected to the sensor; a transmission/reception timing control unit common to them; a measurement method selection control unit for controlling switching between the transit time method unit and the pulse Doppler method unit, and parallel operation; and a measurement value output selector switch for selecting the output of the transit time method unit and the pulse Doppler method unit. That is, the single flowmeter can perform flow rate measurement by the transit time method having no restriction on the measurement range as well as by the pulse Doppler method having an upper limit of the measurement range but enabling a highly accurate measurement.
WEDGE AND WEDGE UNIT FOR USE IN ULTRASONIC DOPPLER FLOW METER
A wedge unit according to the present invention is used for an ultrasonic Doppler flow meter, being mounted on the outer wall of a pipe in which a fluid flows, supplying an ultrasonic wave to the fluid, receives the reflected wave and supplies the reflected wave to a flow rate calculation unit, comprises a wedge with one surface thereof being mounted on a part of the outer circumference of the pipe and on another surface thereof being equipped with an ultrasonic oscillator that generates the ultrasonic wave in response to an electric signal and receives the reflected wave; and an ultrasonic wave attenuation unit being mounted on the outer circumference of the pipe so as to include a position where an ultrasonic wave injected from the ultrasonic oscillator into the pipe by way of the wedge first reaches the outer wall of the pipe after being reflected by the inner wall thereof.
G01F 15/00 - MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME - Details of, or accessories for, apparatus of groups insofar as such details or appliances are not adapted to particular types of such apparatus
DIODE FAILURE DETECTING DEVICE IN ROTARY RECTIFIER
DIODE FAILURE DETECTING DEVICE IN ROTARY RECTIFIER ABSTRACT OF DISCLOSURE A diode failure detecting device in a rotary rectifier having fuses provided respectively for phases and connected in series to rectifying diodes. Light emitting diode circuits in one embodiment are connected in parallel respectively to the fuses which are arranged on the peripheral surface of a rotor. The LED's preferably emit light in different emission spectra when the respective fuses are blown out. An optical fiber sensor is provided on the side of a stator, for detecting when the LED's emit light and a photo-electric converter converts optical signals applied thereto through the optical fiber sensor into electrical signals through optical spectral discrimi- nation separately according to the phases of the rectifier. A logic circuit determines the flow of over-current in the rectifying diodes from an output of the photo-electric converter. In a second embodi- ment, flags on the fuses are optically scanned to determine the presence of a blown fuse. By determin- ing the absence of a pulse or determining pulse width, the detection of a flag is made. If the reflectivi- ties of the flags vary, identification of a particular blown fuse can he made.
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
H02H 7/125 - 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 rectifiers
FO-7-32013M/KK/83. ABSTRACT OF THE DISCLOSURE A tubular part wall thickness measuring device includes a radiation source having a plurality of radia- tion sources disposed in a line. The radiation passes through a collimator to provide parallel radiation beams which pass transversely through a tubular part to a radi- ation detector. The length of the radiation source and the radiation detector are greater than the diameter of the tubular part to be measured so that the radiation passes through an entire section of the tubular part so that the average wall thickness of the tubular part can be determined from the amount of attenuation of radiation which is detected by the detector.