Method and system for limiting the operating temperature of an electric motor
AssigneeGM Global Technology Operations LLC
InventorsYo Chan Son, Silva Hiti
Life of this patent
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Abstract
A method and system for limiting the operating temperature of an electric motor is provided. A maximum operational temperature of the motor is determined. A current operational temperature within the motor is sensed. A maximum allowable power dissipation of the motor is calculated based at least in part on the maximum operational temperature and the current operational temperature of the motor. A torque command for the motor is generated based on the maximum allowable power dissipation.
Claims16
A method for limiting an operational temperature of a motor comprising:
- receiving a maximum operational temperature of the motor;
- determining a current operational temperature within the motor;
- calculating a maximum allowable power dissipation of the motor based at least in part on the maximum operational temperature and the current operational temperature of the motor, wherein the calculating of the maximum allowable power dissipation comprises determining a difference between the maximum operational temperature and the current operational temperature and is a function of the difference between the maximum operational temperature and the current operational temperature;
- calculating a maximum allowable current of the motor based on the maximum allowable power dissipation;
- calculating an available amount of magnetic flux within the motor;
- generating a torque command limit for the motor based at least in part on the maximum allowable power dissipation, the maximum allowable current, and the available amount of magnetic flux;
- and
- operating the motor based on the torque command limit.
A method for limiting an operational temperature of an electric motor in an automobile comprising:
- determining a maximum operational temperature of the motor;
- determining a current operational temperature within the motor;
- calculating a difference between the maximum operational temperature and the current operational temperature;
- calculating a maximum allowable power dissipation of the motor based at least in part on the difference between the maximum operational temperature and the current operational temperature of the motor, the maximum allowable power dissipation being proportional to the difference;
- calculating a maximum allowable current for the motor based on the maximum allowable power dissipation;
- determining an available amount of magnetic flux within the motor;
- generating a torque command limit for the motor based at least in part on the maximum allowable current and the available amount of magnetic flux within the motor;
- and
- operating the motor based on the torque command limit.
An automotive drive system comprising:
- a motor;
- a power supply coupled to the motor;
- and
- a processor in operable communication with the motor and the power supply, the processor being configured to:
- receive a maximum operational temperature of the motor;
- determine a current operational temperature within the motor;
- calculate a maximum allowable power dissipation of the motor based at least in part on the maximum operational temperature and the current operational temperature of the motor;
- calculate a maximum allowable current of the motor based on the maximum allowable power dissipation;
- calculate an available amount of magnetic flux within the motor and
- generate a torque command limit for the motor based at least in part on the maximum allowable power dissipation, the maximum allowable current, and the available amount of magnetic flux.
Dependencies are inferred from the claim text.