Electric motor control apparatus

An electric motor control apparatus, comprising:

• at least two electric motors acting as a motor and a generator;
• a battery;
• an inverter for generating a drive voltage of the electric motor from an input DC voltage and outputting the drive voltage when the electric motor acts as the motor, and converting a generated voltage of the electric motor to a DC voltage and outputting the DC voltage when the electric motor acts as the generator, the inverter being connected between each of the electric motors and the battery;
• a voltage transformation control unit for performing a PWM control with an ON-OFF control action of a switching element forming an inverter connected to the electric motor activated as the motor to transform the drive voltage for the electric motor activated as the motor from the inverter, and for performing a PWM control with an ON-OFF control action of a switching element forming an inverter connected to the electric motor activated as the generator to transform the generated voltage of the electric motor activated as the generator;
• a DC—DC converter for transforming an I/O voltage between the battery and each of the inverters, the DC—DC converter being connected to the battery;
• and
• under conditions where at least one of the electric motors acting as the generator is selected as a PAM controlled motor and the inverter connected to the PAM controlled motor is placed in a state to output a DC voltage without voltage transformation using the voltage transformation control unit,
• a voltage control unit on the driving side for transforming the output voltage of the DC—DC converter to a level which allows a generation of a drive voltage corresponding to a target output of the electric motor acting as the motor with the inverter connected to the electric motor acting as the motor, and performing the voltage transformation using the voltage transformation control unit in such a way as to generate the drive voltage corresponding to the target output with the inverter connected to the electric motor acting as the motor.

An electric motor control apparatus, comprising:

• at least two electric motors acting as a motor and a generator;
• an inverter for generating a drive voltage of the electric motor from an input DC voltage and outputting the drive voltage when the electric motor acts as the motor, and converting a generated voltage of the electric motor to a DC voltage and outputting the DC voltage when the electric motor acts as the generator, the inverter being connected between the electric motors;
• a voltage transformation control unit for performing a PWM control with an ON-OFF control action of a switching element forming an inverter connected to the electric motor activated as the motor to transform the drive voltage for the electric motor activated as the motor from the inverter, and for performing a PWM control with an ON-OFF control action of a switching element forming an inverter connected to the electric motor activated as the generator to transform the generated voltage of the electric motor activated as the generator;
• and
• under conditions where at least one of the electric motors acting as the motor is selected as a PAM controlled motor and the inverter connected to the PAM controlled motor is placed in a state to generate a drive voltage without voltage transformation with the PWM control,
• a voltage control unit on the power generation side for transforming the output voltage of the inverter connected to the electric motor acting as the generator with the voltage transformation control unit in such a way as to input a DC voltage corresponding to a target output of a PAM controlled motor to the inverter connected to the PAM controlled motor.

An electric motor control apparatus, comprising:

• at least two electric motors acting as a motor and a generator;
• an inverter for generating a drive voltage of the electric motor from an input DC voltage and outputting the drive voltage when the electric motor acts as the motor and converting a generated voltage of the electric motor to a DC voltage and outputting the DC voltage when the electric motor acts as the generator, the inverter being connected between the electric motors;
• a voltage transformation control unit for performing a PWM control with an ON-OFF control action of a switching element forming an inverter connected to the electric motor activated as the motor to transform the drive voltage for the electric motor from the inverter and for performing a PWM control with an ON-OFF control action of a switching element forming an inverter connected to the electric motor activated as the generator to transform the generated voltage of the electric motor;
• and
• under conditions where at least one of the electric motors acting as the generator is selected as a PAM controlled motor and the inverter connected to the PAM controlled motor is placed in a state to output a DC voltage without voltage transformation using the voltage transformation control unit,
• a voltage control unit on the driving side for performing the voltage transformation using the voltage transformation control unit in such a way as to generate a drive voltage corresponding to a target output of the electric motor acting as the motor with the inverter connected to the electric motor acting as the motor.