Driving apparatus, power output apparatus, and control method

A power output apparatus capable of outputting power, said apparatus comprising:

• two star connection coils;
• two inverter circuits having a positive pole bus and a negative pole bus for common use, said inverter circuits being capable of supplying polyphase alternating current power to at least each of said two star connection coils;
• a first power supply connected with said positive pole bus and said negative pole bus;
• and
• a second power supply connected between neutral points of said two star connection coils,
• wherein said power output apparatus outputs power by flowing an electric current through said two star connection coils.

A method for controlling a power output apparatus including an electric motor having two star connection coils;

• two inverter circuits having a positive pole bus and a negative pole bus for common use, said inverter circuits being capable of supplying polyphase alternating current power to each of said two star connection coils;
• a storage device connected between said positive pole bus and said negative pole bus;
• and
• a power supply connected between neutral points of said two star connection coils of said electric motor, said method comprising a step of:
• performing switching control of a plurality of switching devices of said two inverter circuits such that a phase difference between each polyphase alternating current power to be supplied to said two star connection coils of said electric motor is equal to a phase difference between said two star connection coils in a state such that an electric potential difference between said neutral points of said two star connection coils can be adjusted, whereby desired torque is output from said electric motor and an electric potential difference between said positive pole bus and said negative pole bus is made to be a desired electric potential difference.

A method for controlling a power output apparatus including a first electric motor having a star connection coil;

• a second electric motor having a star connection coil;
• a first inverter circuit capable of supplying polyphase alternating current power to said first electric motor;
• a second inverter circuit having positive and negative pole buses being positive and negative pole buses of said first inverter circuit, respectively, said second inverter circuit being capable of supplying polyphase alternating current power to said second electric motor;
• a storage device connected between said positive and negative pole buses of said first inverter circuit;
• and
• a power supply connected between a neutral point of said first electric motor and a neutral point of said second electric motor, said method comprising a step of:
• performing switching control of a plurality of switching devices of said first inverter circuit and said second inverter circuit in a state such that an electric potential difference between said neutral point of said first electric motor and said neutral point of said second electric motor can be adjusted, whereby desired torque is output from said first electric motor, desired torque is output from said second electric motor, and an electric potential difference between said positive pole bus and said negative pole bus is made to be a desired electric potential difference.