Abstract: A vehicle includes a gear mechanism connected to a driving wheel; a traveling electric motor configured to exchange heat with a heat exchange medium shared by the gear mechanism and output motive power to the driving wheel via the gear mechanism; and a controller configured to change an operating point of the traveling electric motor to a stronger field side rather than a maximum efficiency point in a case that a temperature of the heat exchange medium is less than a predetermined temperature.

Abstract: A vehicle includes a gear mechanism connected to a driving wheel; a traveling electric motor configured to exchange heat with a heat exchange medium shared by the gear mechanism and output motive power to the driving wheel via the gear mechanism; and a controller configured to change an operating point of the traveling electric motor to a stronger field side rather than a maximum efficiency point in a case that a temperature of the heat exchange medium is less than a predetermined temperature.

Abstract: An electric vehicle control apparatus includes a first motor generator, a second motor generator, a booster, and a controller. The booster boosts an input voltage to the first motor generator and an output voltage from the second motor generator to expand an operable range of the first motor generator and an operable range of the second motor generator into a first expanded operable range and a second expanded operable range, respectively. The controller controls the first motor generator to drive a load with regenerative power supplied during braking of an electric vehicle and to control the first motor generator to be driven at a first inefficient operating point within the first expanded operable range and to control the second motor generator to be driven at a second inefficient operating point within the second expanded operable range in a case where the regenerative power is used.

Abstract: A vehicle includes an electric power storage, an electric power generator, a rotating electric machine, and circuitry. The rotating electric machine is driven with electric power stored in the electric power storage and/or generated by the electric power generator to move the vehicle. The circuitry is configured to calculate target driving force for rotating electric machine, to detect surplus electric power which is generated due to a response delay of the electric power generator upon decreasing an amount of electric power generated by the electric power generator when the target driving force decreases, and to drive the rotating electric machine, when detecting the surplus electric power, with a phase current different from a maximum efficiency phase current with which an electric current value or electric power loss of the rotating electric machine is smallest so that the rotating electric machine consumes the surplus electric power.

Abstract: An electric vehicle control apparatus includes a first motor generator, a second motor generator, a booster, and a controller. The booster boosts an input voltage to the first motor generator and an output voltage from the second motor generator to expand an operable range of the first motor generator and an operable range of the second motor generator into a first expanded operable range and a second expanded operable range, respectively. The controller controls the first motor generator to drive a load with regenerative power supplied during braking of an electric vehicle and to control the first motor generator to be driven at a first inefficient operating point within the first expanded operable range and to control the second motor generator to be driven at a second inefficient operating point within the second expanded operable range in a case where the regenerative power is used.

Abstract: A vehicle includes an energy storage, a motor driver, an electric motor, and circuitry. The motor driver is configured to convert direct-current power to alternating-current power and to convert alternating-current power to direct-current power. The electric motor is connected to the energy storage via the motor driver to move the vehicle. The circuitry is configured to drive the electric motor with a first current value to consume excess electric power. The first current value is different from a minimum current value to generate regeneration power arising from a braking force. The circuitry is configured to drive the electric motor with a second current value smaller than the first current value if a temperature of the electric motor is higher than a first threshold temperature or a temperature of the motor driver is higher than a second threshold temperature.

Abstract: An electric vehicle control apparatus includes a first motor generator, a booster, and a controller. The booster boosts an input voltage to the first motor generator. The controller controls the first motor generator to drive a load with regenerative power supplied during braking of an electric vehicle and to be driven at an inefficient operating point within an operable range of the first motor generator in a case where the regenerative power is used, the booster boosting an input voltage to the first motor generator so as to expand the operable range.

Abstract: A vehicle includes an energy storage, a motor driver, an electric motor, and circuitry. The motor driver is configured to convert direct-current power to alternating-current power and to convert alternating-current power to direct-current power. The electric motor is connected to the energy storage via the motor driver to move the vehicle. The circuitry is configured to drive the electric motor with a first current value to consume excess electric power. The first current value is different from a minimum current value to generate regeneration power arising from a braking force. The circuitry is configured to drive the electric motor with a second current value smaller than the first current value if a temperature of the electric motor is higher than a first threshold temperature or a temperature of the motor driver is higher than a second threshold temperature.

Abstract: A vehicle includes an electric motor to move the vehicle. A motor driver is configured to convert direct-current power supplied from a voltage converter to an alternating-current power and to convert the alternating-current power supplied from the electric motor to direct-current power. Circuitry is configured to drive the electric motor with a first current value to generate a drive force to consume excess electric power. The first current value is different from a minimum current value to generate the same drive force. The circuitry is configured to drive the electric motor with a second current value smaller than the first current value to decrease the electric power consumption of the electric motor when a temperature of the electric motor exceeds a first threshold temperature or a temperature of the motor driver exceeds a second threshold temperature.

Abstract: A vehicle includes an electric power storage, an electric power generator, a rotating electric machine, and circuitry. The rotating electric machine is driven with electric power stored in the electric power storage and/or generated by the electric power generator to move the vehicle. The circuitry is configured to calculate target driving force for rotating electric machine, to detect surplus electric power which is generated due to a response delay of the electric power generator upon decreasing an amount of electric power generated by the electric power generator when the target driving force decreases, and to drive the rotating electric machine, when detecting the surplus electric power, with a phase current different from a maximum efficiency phase current with which an electric current value or electric power loss of the rotating electric machine is smallest so that the rotating electric machine consumes the surplus electric power.

Abstract: A vehicle includes an electric motor to move the vehicle. A motor driver is configured to convert direct-current power supplied from a voltage converter to an alternating-current power and to convert the alternating-current power supplied from the electric motor to direct-current power. Circuitry is configured to drive the electric motor with a first current value to generate a drive force to consume excess electric power. The first current value is different from a minimum current value to generate the same drive force. The circuitry is configured to drive the electric motor with a second current value smaller than the first current value to decrease the electric power consumption of the electric motor when a temperature of the electric motor exceeds a first threshold temperature or a temperature of the motor driver exceeds a second threshold temperature.

Abstract: An electric vehicle control apparatus includes a first motor generator, a booster, and a controller. The booster boosts an input voltage to the first motor generator. The controller controls the first motor generator to drive a load with regenerative power supplied during braking of an electric vehicle and to be driven at an inefficient operating point within an operable range of the first motor generator in a case where the regenerative power is used, the booster boosting an input voltage to the first motor generator so as to expand the operable range.

Abstract: A controller for a motor that can set an induced voltage constant of a motor of a double rotor type according to an operational state of the motor and expand the controllable range of the motor. The controller may include a command calculator that calculates a command value of the induced voltage constant of a motor based on the output voltage of a direct-current power supply, the number of revolutions Nm of the motor and a torque command in such a manner that the magnitude of a vector sum of a d-axis current and a q-axis current that have to be supplied in order to produce the torque according to the torque command is minimized, and a phase difference controller that calculates a command value of a rotor phase difference according to the command value and outputs the command value to an actuator to change the rotor phase difference.

Abstract: A change in torque produced by a motor having two rotors is reduced when the motor operates in a low-velocity and low-torque operational state. The motor has a first rotor and a second rotor, each of which has a permanent magnet, and an output shaft capable of rotating integrally with the first rotor. The second rotor can relatively rotate with respect to the first rotor by a driving force from a phase difference changing driving device, and the phase difference between the rotors (rotor phase difference) can be changed by the relative rotation of the second rotor with respect to the first rotor. When the values of the torque and the rotational velocity of the motor lie within a predetermined region in the proximity of 0, the phase difference changing driving device adjusts the rotor phase difference to a predetermined phase difference for which the strength of a composite field of the permanent magnets is lower than a maximum strength.

Abstract: There is provided a controller for a motor capable of changing the phase difference between two rotors that can prevent demagnetization of permanent magnets or the rotors. The motor has two rotors each having a permanent magnet and phase difference changing driving means for changing the phase difference between the rotors. The controller has a demagnetization determining means for determining whether or not demagnetization of the permanent magnets of the rotors occurs during operation of the motor, and rotor phase difference controlling means for controlling the phase difference changing driving means to change the phase difference between the rotors from a current phase difference to a phase difference that results in a higher strength of a composite field of the permanent magnets if the result of determination by the demagnetization determining means is positive.

Abstract: A controller for a motor and a control method for a motor change an operating condition of each motor, considering difference in operating conditions, such as loss and temperature, thus making it possible to reduce a total loss in a plurality of motors. The controller includes a first motor operating condition calculator and a second motor operating condition calculator which calculate the estimated values of losses incurred when a first motor and a second motor are driven, and a DC voltage control unit which carries out, on a motor having a largest estimated value of loss, the processing for changing a supply voltage to change the voltage of DC power supplied to inverters by a DC/DC converter, thereby reducing the difference between a phase voltage, which is the resultant vector of the voltages across terminals of the motor, and a target voltage set on the basis of an output voltage of the DC/DC converter.

Abstract: There is provided a controller for a motor capable of changing the phase difference between two rotors that can prevent demagnetization of permanent magnets or the rotors. The motor has two rotors each having a permanent magnet and phase difference changing driving means for changing the phase difference between the rotors. The controller has a demagnetization determining means for determining whether or not demagnetization of the permanent magnets of the rotors occurs during operation of the motor, and rotor phase difference controlling means for controlling the phase difference changing driving means to change the phase difference between the rotors from a current phase difference to a phase difference that results in a higher strength of a composite field of the permanent magnets if the result of determination by the demagnetization determining means is positive.

Abstract: To provide a controller for a motor that can appropriately set the induced voltage constant of a motor of a double rotor type according to the operational state of the motor and expand the controllable range of the motor. A controller has a Ke command calculator 90 that calculates a command value Ke_c of the induced voltage constant of a motor 1 based on the output voltage Vdc of a direct-current power supply, the number of revolutions Nm of the motor 1 and a torque command Tr_c in such a manner that the magnitude of a vector sum of a d-axis current and a q-axis current that have to be supplied in order to produce the torque according to the torque command Tr_c is minimized, and a phase difference controller 80 that calculates a command value ?d_c of a rotor phase difference according to the command value Ke_c and outputs the command value ?d_c to an actuator 25 to change the rotor phase difference.

Abstract: A change in torque produced by a motor having two rotors is reduced when the motor operates in a low-velocity and low-torque operational state. The motor has a first rotor and a second rotor, each of which has a permanent magnet, and an output shaft capable of rotating integrally with the first rotor. The second rotor can relatively rotate with respect to the first rotor by a driving force from a phase difference changing driving device, and the phase difference between the rotors (rotor phase difference) can be changed by the relative rotation of the second rotor with respect to the first rotor. When the values of the torque and the rotational velocity of the motor lie within a predetermined region in the proximity of 0, the phase difference changing driving device adjusts the rotor phase difference to a predetermined phase difference for which the strength of a composite field of the permanent magnets is lower than a maximum strength.

Abstract: A controller for a motor and a control method for a motor change an operating condition of each motor, considering difference in operating conditions, such as loss and temperature, thus making it possible to reduce a total loss in a plurality of motors. The controller includes a first motor operating condition calculator and a second motor operating condition calculator which calculate the estimated values of losses incurred when a first motor and a second motor are driven, and a DC voltage control unit which carries out, on a motor having a largest estimated value of loss, the processing for changing a supply voltage to change the voltage of DC power supplied to inverters by a DC/DC converter, thereby reducing the difference between a phase voltage, which is the resultant vector of the voltages across terminals of the motor, and a target voltage set on the basis of an output voltage of the DC/DC converter.