Method and apparatus for controlling permanent magnet motor, power system and electric vehicle

An apparatus for controlling a permanent magnet motor, comprising:

• an obtaining module, configured to obtain system parameters of the permanent magnet motor, wherein the system parameters comprise:
• a resonance bandwidth of the permanent magnet motor and a natural frequency of a stator of the permanent magnet motor;
• a determining module, configured to set a power frequency of the permanent magnet motor according to the system parameters;
• a control module, configured to supply power to the permanent magnet motor by using alternating current at the power frequency when a power battery meets a self-heating condition;
• wherein an even multiple of the power frequency is outside a resonance frequency band, and the resonance frequency band is determined according to the natural frequency of the stator and the resonance bandwidth of the permanent magnet motor.