Abstract: A maintenance support system includes a wearable device that provides an on-site maintenance worker with maintenance instruction information; a plurality of maintenance support terminals installed in a plurality of regions having time differences; and a maintenance management server connected to the wearable device and the maintenance support terminals. The maintenance management server includes a representative selection unit that selects a maintenance support terminal on the basis of representative level information, the standard work hours being fixed for each of the plurality of regions; and a translation unit that translates audio information transmitted and received between the wearable device and the maintenance support terminal selected by the representative selection unit on a basis of a language set on the wearable device and a language set on the maintenance support terminal selected by the representative selection unit.

Abstract: A maintenance support system includes a wearable device that provides an on-site maintenance worker with maintenance instruction information; a plurality of maintenance support terminals installed in a plurality of regions having time differences; and a maintenance management server connected to the wearable device and the maintenance support terminals. The maintenance management server includes a representative selection unit that selects a maintenance support terminal on the basis of representative level information, the standard work hours being fixed for each of the plurality of regions; and a translation unit that translates audio information transmitted and received between the wearable device and the maintenance support terminal selected by the representative selection unit on a basis of a language set on the wearable device and a language set on the maintenance support terminal selected by the representative selection unit.

Abstract: A virtual verification system according to the present invention includes a real-time simulator; and a drive controller that can be connected to the real-time simulator in a virtual verification mode, and is capable of driving an electric motor in an actual operation mode. The drive controller includes an output unit that supplies electrical power to the electric motor in the actual operation mode, and outputs a signal corresponding to a virtual verification model installed in the real-time simulator in the virtual verification mode.

Abstract: A power regenerative converter, includes: a power module configured to include rectifiers and regenerative switches; a smoothing capacitor connected to direct-current power supply terminals, and that accumulates direct-current power during an alternating-current to direct-current conversion; a bus current detector that detects a bus current flowing between either of the direct-current power supply terminals and the smoothing capacitor; a power supply phase detector that detects a phase of an input power supply; a base drive signal generator that generates base drive signals that perform ON/OFF control of the regenerative switching elements based on a power supply phase detected by the power supply phase detection unit; a regeneration controller that performs a start and stop process of a power regenerative operation based on a detection result of the bus current detector and the base drive signals; and an overload detector that detects overload of a power regenerative converter based on the detection result o

Abstract: With regard to an end portion shape of a slit formed in a rotor core in which flux barriers are formed in a circumferential direction in an identical number to the number of poles by arranging one or more slits and core layers alternately in a radial direction, an end portion of a slit is shaped such that, when mg is set as the number of slit end portions, ni is set as a natural number no smaller than 1, ? and ? are set as numbers within a range of ?¼ to ¼, q is set as a natural number no smaller than 1, and Ns is set as the number of slots, intervals ?gi and ?gi from a first slit end to an ith slit end of a slit wall on an identical circumferential direction side satisfy specific mathematical formulae.

Abstract: A motor control device includes a master-shaft drive device to drive a master-shaft motor, and a slave-shaft drive device to drive a slave-shaft motor, the motor control device including a correction-amount calculation unit to use a detection result of a position of the master-shaft motor and a detection result of a position of the slave-shaft motor to calculate a correction amount for correcting a speed command that is to be used for controlling the master-shaft motor, a correction unit to use the correction amount to correct the speed command that is to be used for controlling the master-shaft motor, and a position control unit to execute position control on the slave-shaft motor by using the detection result of the position of the master-shaft motor as a position command.

Abstract: A motor control device includes a master-shaft drive device to drive a master-shaft motor, and a slave-shaft drive device to drive a slave-shaft motor , the motor control device including a correction-amount calculation unit to use a detection result of a position of the master-shaft motor and a detection result of a position of the slave-shaft motor to calculate a correction amount for correcting a speed command that is to be used for controlling the master-shaft motor, a correction unit to use the correction amount to correct the speed command that is to be used for controlling the master-shaft motor, and a position control unit to execute position control on the slave-shaft motor by using the detection result of the position of the master-shaft motor as a position command.

Abstract: A power regenerative converter, includes: a power module configured to include rectifiers and regenerative switches; a smoothing capacitor connected to direct-current power supply terminals, and that accumulates direct-current power during an alternating-current to direct-current conversion; a bus current detector that detects a bus current flowing between either of the direct-current power supply terminals and the smoothing capacitor; a power supply phase detector that detects a phase of an input power supply; a base drive signal generator that generates base drive signals that perform ON/OFF control of the regenerative switching elements based on a power supply phase detected by the power supply phase detection unit; a regeneration controller that performs a start and stop process of a power regenerative operation based on a detection result of the bus current detector and the base drive signals; and an overload detector that detects overload of a power regenerative converter based on the detection result o

Abstract: With regard to an end portion shape of a slit formed in a rotor core in which flux barriers are formed in a circumferential direction in an identical number to the number of poles by arranging one or more slits and core layers alternately in a radial direction, an end portion of a slit is shaped such that, when mg is set as the number of slit end portions, ni is set as a natural number no smaller than 1, ? and ? are set as numbers within a range of ?¼ to ¼, q is set as a natural number no smaller than 1, and Ns is set as the number of slots, intervals ?gi and ?gi from a first slit end to an ith slit end of a slit wall on an identical circumferential direction side satisfy specific mathematical formulae.

Abstract: A stator of a rotary electrical machine according to the invention includes a core back, a plurality of teeth, a plurality of slots, and a coil. The coil is configured by a plurality of conductor wires. Between inside of the slot and outside of the slot, the plurality of conductor wires are bent at an angle smaller than 180° in a circumferential direction of the core back, and between the bent part and the inside of the slot, the plurality of conductor wires are bent in the circumferential direction of the core back and in an opposite direction to a bending direction of the bent part.

Abstract: A permanent magnet rotary electric machine includes: a stator in which a plurality of teeth and a plurality of slots are formed on an inner periphery of a cylindrical stator core, and a winding wire is wound around the teeth so as to be disposed in the slots; and a rotor disposed in a hollow portion of the stator with an air gap between the rotor and the stator. In the rotor, 2n or more (n is a natural number equal to or larger than 1) radial projections are provided on an outer periphery of a rotor core, and a ferrite magnet is disposed between adjacent projections. A radial height of the projection is less than a thickness of middle of the ferrite magnet.

Abstract: A permanent magnet rotary electric machine includes: a stator in which a plurality of teeth and a plurality of slots are formed on an inner periphery of a cylindrical stator core, and a winding wire is wound around the teeth so as to be disposed in the slots; and a rotor disposed in a hollow portion of the stator with an air gap between the rotor and the stator. In the rotor, 2n or more (n is a natural number equal to or larger than 1) radial projections are provided on an outer periphery of a rotor core, and a ferrite magnet is disposed between adjacent projections. A radial height of the projection is less than a thickness of middle of the ferrite magnet.

Abstract: A stator according to the present invention includes: a cylindrical stator core; a plurality of tooth portions provided along a circumferential direction of the stator core; and windings disposed in a plurality of slots provided between the tooth portions and wound around the tooth portions. The windings are configured by materials having different electrical resistivities. A ratio of a sectional area of a material having a high electrical resistivity to a sectional area of a material having a low electrical resistivity in the slot is equal to or larger than 1 and equal to or smaller than a ratio of the electrical resistivity of the material having the high electrical resistivity to the electrical resistivity of the material having the low electrical resistivity.

Abstract: A stator according to the present invention includes: a cylindrical stator core; a plurality of tooth portions provided along a circumferential direction of the stator core; and windings disposed in a plurality of slots provided between the tooth portions and wound around the tooth portions. The windings are configured by materials having different electrical resistivities. A ratio of a sectional area of a material having a high electrical resistivity to a sectional area of a material having a low electrical resistivity in the slot is equal to or larger than 1 and equal to or smaller than a ratio of the electrical resistivity of the material having the high electrical resistivity to the electrical resistivity of the material having the low electrical resistivity.

Abstract: A power conversion apparatus includes a power-conversion circuit unit that includes at least two voltage-type bridge circuits of an upper and lower arm configuration including switching elements connected in series, each of the switching elements including a transistor and a free wheel diode connected to the transistor in inverse parallel. Each of the voltage-type bridge circuits is configured to include, as the free wheel diodes: a SiC-SBD (SiC-Schottky-Barrier Diodes) in both upper and lower arms; a SiC-SBD only in the upper arm; a SiC-SBD only in the lower arm; or a diode other than the SiC-SBD in both the upper and lower arms; and the power-conversion circuit unit is configured by combining at least two configurations among the four configurations for the voltage-type bridge circuits.

Abstract: A power conversion device is provided in which destruction of a switching element can be avoided by preventing an excessive current from flowing into the switching element of a main circuit when, for example, a power supply for the power conversion device is interrupted. The power conversion device including a first switch unit in which a plurality of switching elements are series-connected is characterized by including, in the plurality of switching elements, at least one or more switching elements whose gate voltage thresholds are no more than a predetermined value and at least one or more switching elements whose gate voltage thresholds are more than the predetermined value.

Abstract: A power conversion apparatus includes a power-conversion circuit unit that includes at least two voltage-type bridge circuits of an upper and lower arm configuration including switching elements connected in series, each of the switching elements including a transistor and a free wheel diode connected to the transistor in inverse parallel. Each of the voltage-type bridge circuits is configured to include, as the free wheel diodes: a SiC-SBD (SiC-Schottky-Barrier Diodes) in both upper and lower arms; a SiC-SBD only in the upper arm; a SiC-SBD only in the lower arm; or a diode other than the SiC-SBD in both the upper and lower arms; and the power-conversion circuit unit is configured by combining at least two configurations among the four configurations for the voltage-type bridge circuits.

Abstract: A control apparatus for a permanent magnet synchronous motor capable of performing highly accurate torque control not only during low-speed operation and medium-speed operation but also during high-speed operation without increasing a burden on a product CPU irrespective of whether the permanent magnet synchronous motor is an SPM motor or an IPM motor. The control apparatus includes a torque correction circuit that generate a torque correction command from a current phase of current correction commands on a d-axis and a q-axis and a torque command and supplies the torque correction command to a d/q-axis current command generator instead of the torque command.

Abstract: A control apparatus for a permanent magnet synchronous motor capable of performing highly accurate torque control not only during low-speed operation and medium-speed operation but also during high-speed operation without increasing a burden on a product CPU irrespective of whether the permanent magnet synchronous motor is an SPM motor or an IPM motor. The control apparatus includes a torque correction circuit that generate a torque correction command from a current phase of current correction commands on a d-axis and a q-axis and a torque command and supplies the torque correction command to a d/q-axis current command generator instead of the torque command.

Abstract: A power conversion device including sub-inverters, each connected in series with respective phase of a three-phase main inverter including a smoothing capacitor, which is fed from a power supply via a converter, as a DC input thereof, and feeds power to a load using the sum of outputs of the inverters. A manipulative quantity is determined so that the DC voltage at each of smoothing capacitors which is an input of each of the sub-inverters will follow a command value. The manipulative quantity is added to an output voltage command for the three-phase main inverter, and is subtracted from an output voltage command for the sub-inverters. Thus, power is shifted from the three-phase main inverter to the smoothing capacitors of the sub-inverters.