Power factor adjusting method based on motor torque model

The invention discloses a power factor adjusting method based on a motor torque model, which comprises the following steps of: acquiring a three-phase output current sampling value of a permanent magnet motor driver in real time, determining an electrical angle of a permanent magnet motor, and converting the three-phase output current according to the electrical angle of the permanent magnet motor to obtain current values of a d axis and a q axis of the motor and an included angle of the current values; and finally, adjusting current values of a d axis and a q axis of the permanent magnet motor according to a motor electromagnetic torque model, determining a motor power factor corresponding to the minimum current under the required electromagnetic torque according to feedback values of the voltage and the current, and reversely deducing a three-phase output current of a permanent magnet motor driver to complete power factor adjustment of the permanent magnet motor. According to the method, the included angle