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   Abstract: In order to improve the speed regulation performance of PI controller in permanent magnet synchronous motor, a new power exponential approach law sliding mode controller for permanent magnet motor MTPA vector control strategy is proposed. A new power approach law is added to the traditional exponential approach law to improve the convergence ability of the system and reduce the jitter.The control strategy of compensating maximum torque per ampere is introduced in the PMSM. According to the current transformation in the motor, the torque in the control process is obtained, and the obtained torque is used as the compensation signal to improve the response of q-axis current. The simulation results show that compared with the conventional vector control method and the traditional sliding mode controller, the combined method can effectively reduce the system jitter, and has stronger control accuracy and anti load torque disturbance ability.

    Key words: power approach law; sliding mode control; maximum torque per ampere; torque compensation; permanent magnet synchronous motor