Method and system for operating an electric motor coupled to multiple power supplies
AssigneeGM Global Technology Operations LLC
InventorsSibaprasad Chakrabarti, Brian A. Welchko, Silva Hiti
Life of this patent
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Abstract
Methods and systems are provided for operating an electric motor having at least one winding coupled to first and second power supplies. A torque command for the electric motor is received. A present power reserve for the first and second power supplies is determined based at least in part on the torque command. An operating voltage for the second power supply is determined based on the present power reserve. The operating voltage for the second power supply is applied to the at least one winding. The application of the operating voltage allowing the present power reserve to flow between the first and second power supplies and the motor.
Claims20
A method for operating an electric motor having at least one winding coupled to first and second power supplies, comprising:
- receiving a torque command for the electric motor;
- determining a present power reserve for the first and second power supplies based at least in part on the torque command;
- determining an operating voltage for the second power supply based on the present power reserve;
- and
- applying the operating voltage for the second power supply to the at least one winding, the application of the operating voltage allowing the present power reserve to flow between at least two of the first power supply, the second power supply, and the motor.
A method for operating an electric motor having at least one winding with a first direct current (DC) power supply and a first power inverter coupled to a first end thereof and a second DC power supply and a second power inverter coupled to a second end thereof, the method comprising:
- receiving a torque command for the electric motor;
- determining a power command for the first DC power supply based on the torque command, the power command for the first DC power supply being one of less than a maximum power output of the first DC power supply or not less than the maximum power output of the first DC power supply;
- determining a power command for the second DC power supply based on a difference between the power command for the first DC power supply and the maximum power output of the first DC power supply;
- and
- determining an operating voltage for the second DC power supply based on the power command for the second DC power supply
- applying the operating voltage for the second DC power supply to the at least one winding with the second power supply.
An automotive drive system comprising:
- an electric motor having at least one winding;
- first and second direct current (DC) power supplies coupled to the at least one winding;
- first and second power inverters coupled between the respective first and second DC power supplies and the at least one winding to receive DC power from the first and second DC power supplies and provide alternating current (AC) power to the electric motor;
- a processor in operable communication with the electric motor, the first and second DC power supplies, and the first and second power inverters, the processor being configured to:
- determine a present power reserve for the first and second DC power supplies based at least in part on a torque command for the electric motor;
- determine an operating voltage for the second DC power supply based on the present power reserve;
- and
- operate the second power inverter to apply the operating voltage for the second power supply to the at least one winding with the second power supply.
Dependencies are inferred from the claim text.