Abstract: A drive controller according to an aspect controls drive of a three-phase motor, and includes an electric value calculation unit that calculates an electric value in each of coordinate axes of rotating coordinates of the three-phase motor based on an electric value that is at least one of a current value and a voltage value generated in the three-phase motor, and a fault determination unit that determines a fault phase having a fault in phases of the three-phase motor by combining positive-negative information on at least one of a difference between a calculation electric value calculated by the electric value calculation unit and a target electric value indicating a control target of an electric value in each of the coordinate axes, and a variation of the difference, with each of the coordinate axes.

Abstract: A power conversion apparatus includes a first inverter connected to one end of each of the respective phase windings of a motor, a second inverter connected to another end of each of the respective phase windings, and a control circuit that controls the operations of the first and second inverters. The control circuit controls, based on a third-order component of the magnetic flux of a permanent magnet of a rotor and a third-order component of a current supplied to an A-phase winding, a sixth-order component of a radial force acting on teeth of a stator.

Abstract: A power converter converts power from a power source into power to be supplied to a motor having n-phase (n is an integer of 3 or larger) windings. The power converter includes an inverter including switches connected to the windings, a controller to control operation of each of the switches, and a failure detector to detect a sign of failure in a drive system ranging from the power source to the motor. When a sign of failure is detected by the failure detector, the controller is configured or programmed to check presence or absence of a failure in the drive system while supplying power to the motor by causing the inverter to perform a failure operation.

Abstract: A power conversion device includes a first inverter including an upper arm and a lower arm and connected to a first end of a winding wire of each phase of a motor, a second inverter including an upper arm and a lower arm and connected to a second end on the other side of the first end, a first power supply to supply power to the upper arm of the first inverter and the lower arm of the second inverter, and a second power supply to supply power to the upper arm of the second inverter and the lower arm of the first inverter.

Abstract: A power conversion device includes a first inverter and a control circuit that controls an on/off operations of switches in the first inverter and diagnoses disconnection failures of n-phase windings, where n is an integer of three or more. The control circuit generates a control signal to turn off all of n low-side switches and n high-side switches, supplies the control signal to the n low-side switches and the n high-side switches and measures the n-phase voltages that change depending on patterns of on failures of the switches, and executes a first failure diagnosis to diagnose the on failures of the n low-side switches and the n high-side switches based on the measured n-phase voltages by referring to a table associating the patterns of the on failures of the switches with n-phase voltage levels.

Abstract: A power conversion apparatus converts power from a power supply to power to be supplied to a motor including windings for n phases where n is an integer equal to or greater than three. The power conversion apparatus includes a first inverter connected to one end of the winding for each phase of the motor, a second inverter connected to another end of the winding for each phase, and a control circuit to control an operation of each of the first and second inverters. The windings for the n phases include a winding for a first phase and a winding for a second phase, and the control circuit superimposes a correction wave to reduce an induced electric current induced in the winding for the second phase by passing electricity through the winding for the first phase on a fundamental wave to pass electricity through the winding for the second phase.

Abstract: A power conversion device includes a first inverter, a second inverter, and a control circuit that performs Pulse Width Modulation (PWM) control of switching elements of the first and second inverters according to at least one switching scheme. For an H bridge of each phase, the control circuit performs PWM control according to at least one switching scheme that turns on a high-side switching element in one of a pair of legs and switches a low-side switching element in another of the pair of legs, or turns on a low-side switching element in one of the pair of legs and switches a high-side switching element in another of the pair of legs.

Abstract: A power converter converts power from a power source into power to be supplied to a motor having n-phase (n is an integer of 3 or larger) windings. The power converter includes an inverter including switches connected to the windings, a controller to control operation of each of the switches, and a failure detector to detect a sign of failure in a drive system ranging from the power source to the motor. When a sign of failure is detected by the failure detector, the controller is configured or programmed to check presence or absence of a failure in the drive system while supplying power to the motor by causing the inverter to perform a failure operation.

Abstract: A drive controller according to an aspect controls drive of a three-phase motor, and includes an electric value calculation unit that calculates an electric value in each of coordinate axes of rotating coordinates of the three-phase motor based on an electric value that is at least one of a current value and a voltage value generated in the three-phase motor, and a fault determination unit that determines a fault phase having a fault in phases of the three-phase motor by combining positive-negative information on at least one of a difference between a calculation electric value calculated by the electric value calculation unit and a target electric value indicating a control target of an electric value in each of the coordinate axes, and a variation of the difference, with each of the coordinate axes.

Abstract: An electric power conversion apparatus includes a first inverter electrically connected to one end of each of phase windings of a motor, and a second inverter electrically connected to the other end of each of the phase windings, and a neutral point potential setting circuit electrically connected to the first inverter to set a potential of a neutral point in the first inverter when the first inverter is determined to be in an abnormal state.

Abstract: A power conversion device may include a first inverter to which a first end of each phase winding of the electric motor is coupled; a second inverter to which a second end of each phase winding is coupled; a first phase isolation relay circuit structured to switch between connection and disconnection of the one end of each phase winding to and from the first inverter; and a first neutral point relay circuit to which the one end of each phase winding is coupled and which is structured to switch between connection and disconnection of the one end of each phase winding to and from the one end of each other phase winding.

Abstract: A power conversion device includes a first inverter, a second inverter, and a control circuit that performs Pulse Width Modulation (PWM) control of switching elements of the first and second inverters according to at least one switching scheme. For an H bridge of each phase, the control circuit performs PWM control according to at least one switching scheme that turns on a high-side switching element in one of a pair of legs and switches a low-side switching element in another of the pair of legs, or turns on a low-side switching element in one of the pair of legs and switches a high-side switching element in another of the pair of legs.

Abstract: A power conversion device includes a first inverter including an upper arm and a lower arm and connected to a first end of a winding wire of each phase of a motor, a second inverter including an upper arm and a lower arm and connected to a second end on the other side of the first end, a first power supply to supply power to the upper arm of the first inverter and the lower arm of the second inverter, and a second power supply to supply power to the upper arm of the second inverter and the lower arm of the first inverter.

Abstract: A power conversion device includes a first inverter and a control circuit that controls an on/off operations of switches in the first inverter and diagnoses disconnection failures of n-phase windings, where n is an integer of three or more. The control circuit generates a control signal to turn off all of n low-side switches and n high-side switches, supplies the control signal to the n low-side switches and the n high-side switches and measures the n-phase voltages that change depending on patterns of on failures of the switches, and executes a first failure diagnosis to diagnose the on failures of the n low-side switches and the n high-side switches based on the measured n-phase voltages by referring to a table associating the patterns of the on failures of the switches with n-phase voltage levels.

Abstract: A power conversion apparatus converts power from a power supply to power to be supplied to a motor including windings for n phases where n is an integer equal to or greater than three. The power conversion apparatus includes a first inverter connected to one end of the winding for each phase of the motor, a second inverter connected to another end of the winding for each phase, and a control circuit to control an operation of each of the first and second inverters. The windings for the n phases include a winding for a first phase and a winding for a second phase, and the control circuit superimposes a correction wave to reduce an induced electric current induced in the winding for the second phase by passing electricity through the winding for the first phase on a fundamental wave to pass electricity through the winding for the second phase.

Abstract: A power conversion device includes a first inverter connected to one end of a winding of each phase of a motor of n phases, n being an integer equal to or greater than 3, a second inverter connected to the other end of the winding of each phase, and at least two drivers to drive n H bridges including windings of n phases, n legs of the first inverter, and n legs of the second inverter. Each of the n H bridges is connected to any one of the at least two drivers.

Abstract: An electric power conversion apparatus includes a first inverter electrically connected to one end of each of phase windings of a motor, and a second inverter electrically connected to the other end of each of the phase windings, and a neutral point potential setting circuit electrically connected to the first inverter to set a potential of a neutral point in the first inverter when the first inverter is determined to be in an abnormal state.

Abstract: A power conversion device may include a first inverter to which a first end of each phase winding of the electric motor is coupled; a second inverter to which a second end of each phase winding is couple& a first phase isolation relay circuit structured to switch between connection and disconnection of the one end of each phase winding to and from the first inverter; and a first neutral point relay circuit to which the one end of each phase winding is coupled and which is structured to switch between connection and disconnection of the one end of each phase winding to and from the one end of each other phase winding.