Electric motor control device, drive device and hybrid drive device

An electric motor control device comprising:

• an inverter that supplies an output of a primary-side DC power supply to an electric motor to control driving of the electric motor;
• a converter that includes a voltage increasing power supply device that increases a voltage of the primary-side DC power supply to supply the inverter with the increased voltage as a secondary voltage, and a regenerative power supply device that reversely supplies regenerative power from the inverter to the primary-side DC power supply;
• a secondary-side target voltage determination unit that determines a secondary-side target voltage such that the electric motor is driven on the basis of one of a first region in a modulation mode in which PWM power is applied to at least two phases and in which field weakening control is not performed, a third region in a modulation mode in which PWM power at a voltage lower than a maximum voltage of the converter is applied to at least two phases and in which field weakening control is performed, and a second region in a one-pulse mode in which rectangular-wave power at a voltage lower than the maximum voltage of the converter is applied to all phases and in which field weakening control is performed;
• a converter control unit that controls the voltage increasing power supply unit and the regenerative power supply unit of the converter such that the secondary voltage becomes the secondary-side target voltage;
• and
• an electric motor control unit that controls the inverter on the basis of a target torque and a rotation speed of the electric motor and the secondary voltage such that an output torque of the electric motor becomes the target torque.

An electric motor control device comprising:

• an inverter that supplies an output of a primary-side DC power supply to an electric motor to control driving of the electric motor;
• a converter that includes a voltage increasing power supply device that increases a voltage of the primary-side DC power supply to supply the inverter with the increased voltage as a secondary voltage, and a regenerative power supply device that reduces a voltage of regenerative power from the inverter to reversely supply the reduced voltage to the primary-side DC power supply;
• a secondary-side target voltage determination unit that derives a secondary-side target voltage on the basis of secondary-side target voltage characteristics for each target torque of the electric motor in which the secondary-side target voltage increases with a first gradient in accordance with an increase in a rotation speed of the electric motor in a modulation mode in which PWM power is applied to at least two phases, is switched to increase with a third gradient different from the first gradient at a first rotation speed at which field weakening control is started, and is switched to increase with a second gradient different from the third gradient at a second rotation speed at which the modulation mode is switched to a one-pulse mode in which rectangular-wave power is applied to all phases, up to a maximum voltage of the converter;
• a converter control unit that controls the voltage increasing power supply unit and the regenerative power supply unit of the converter such that the secondary voltage becomes the secondary-side target voltage;
• and
• an electric motor control unit that controls the inverter on the basis of the target torque and the rotation speed of the electric motor and the secondary voltage such that an output torque of the electric motor becomes the target torque.

A hybrid drive device comprising:

• a first electric motor that drives wheels;
• a second electric motor rotationally driven by a fuel engine;
• a first inverter that supplies an output of a primary-side DC power supply to the first electric motor to control driving of the first electric motor;
• a second inverter that supplies the output of the primary-side DC power supply to the second electric motor to control driving of the second electric motor;
• a converter that includes a voltage increasing power supply device that increases a voltage of power of the primary-side DC power supply to supply the first and second inverters with the increased voltage, and a regenerative power supply device that reversely supplies regenerative power from the first and second inverters to the primary-side DC power supply;
• a first secondary-side target voltage determination unit that determines a first secondary-side target voltage such that the first electric motor is driven on the basis of one of a first region in a modulation mode in which PWM power is applied to at least two phases and in which field weakening control is not performed, a third region in a modulation mode in which PWM power at a voltage lower than a maximum voltage of the converter is applied to at least two phases and in which field weakening control is performed, and a second region in a one-pulse mode in which rectangular-wave power at a voltage lower than the maximum voltage of the converter is applied to all phases and in which field weakening control is performed;
• a second secondary-side target voltage determination unit that derives the second secondary-side target voltage suitable for an efficient operation of the second electric motor, in accordance with a target torque and a rotation speed of the second electric motor;
• a converter control unit that controls the voltage increasing power supply unit and the regenerative power supply unit of the converter such that a secondary voltage supplied to the first and second inverters by the converter becomes a higher one of the first secondary-side target voltage and the second secondary-side target voltage;
• a first motor control unit that controls the first inverter on the basis of a target torque and a rotation speed of the first electric motor and the secondary voltage such that an output torque of the first electric motor becomes the target torque;
• and
• a second motor control unit that controls the second inverter on the basis of the target torque and the rotation speed of the second electric motor and the secondary voltage such that an output torque of the second electric motor becomes the target torque.

A hybrid drive device comprising:

• a first electric motor that drives wheels;
• a second electric motor rotationally driven by a fuel engine;
• a primary-side DC power supply;
• a first inverter that supplies an output of the primary-side DC power supply to the first electric motor to control driving of the first electric motor;
• a second inverter that supplies the output of the primary-side DC power supply to the second electric motor to control driving of the second electric motor;
• a converter that includes a voltage increasing power supply device that increases a voltage of power of the primary-side DC power supply to supply the first and second inverters with the increased voltage, and a regenerative power supply device that reversely supplies regenerative power from the first and second inverters to the primary-side DC power supply;
• a first secondary-side target voltage determination unit that derives a first secondary-side target voltage on the basis of secondary-side target voltage characteristics for each target torque of the first electric motor in which the secondary-side target voltage increases with a first gradient in accordance with an increase in a rotation speed of the first electric motor in a modulation mode in which PWM power is applied to at least two phases, is switched to increase with a third gradient smaller than the first gradient at a first rotation speed at which field weakening control is started, and is switched to increase with a second gradient larger than the third gradient at a second rotation speed at which the modulation mode is switched to a one-pulse mode in which rectangular-wave power is applied to all phases, up to a maximum voltage of the converter;
• a second secondary-side target voltage determination unit that derives the second secondary-side target voltage suitable for an efficient operation of the second electric motor, in accordance with a target torque and a rotation speed of the second electric motor;
• a converter control unit that controls the voltage increasing power supply unit and the regenerative power supply unit of the converter such that a secondary voltage supplied to the first and second inverters by the converter becomes a higher one of the first secondary-side target voltage and the second secondary-side target voltage;
• a first motor control unit that controls the first inverter on the basis of the target torque and the rotation speed of the first electric motor and the secondary voltage such that an output torque of the first electric motor becomes the target torque;
• and
• a second motor control unit that controls the second inverter on the basis of the target torque and the rotation speed of the second electric motor and the secondary voltage such that an output torque of the second electric motor becomes the target torque.