Torque compensation method based on motor flux-weakening open loop control and motor controller

The invention provides a torque compensation method based on motor flux-weakening open loop control. The torque compensation method comprises the following steps: the three-phase current of the motor can be detected; the actual torque of the motor can be calculated according to the three-phase current of the motor, and the torque deviation between the actual torque and the target torque of the motor can be calculated, when the motor is in the flux-weakening open loop control mode; compensation voltage can be acquired by adopting the PI adjustment of the torque deviation, and the compensation voltage can be applied to the q-axis voltage of the motor in an overlapped manner to realize the torque compensation of the motor. By adopting the torque compensation method, the bad influence of the flux-weakening open loop control on the motor actual torque can be improved, the stability, the response speed, and the control precision of the motor control system can be improved. The invention also provides a motor controller.