Abstract: Aiming at the precise control of the permanent magnet synchronous motor (PMSM) speed, a Maximum Torque per Ampere (MTPA) control strategy is proposed based on electromagnetic torque. Field-circuit coupling simulation method and experiment are used to verify that MTPA based on electromagnetic torque has stronger anti load interference ability and better dynamic performance than MTPA based on stator current and id = 0 control, which has a certain reference significance for the precise control of the motor. The MTPA control strategy based on electromagnetic torque can quickly adjust the d-axis current according to the difference between the actual speed and the given speed, so that the motor speed overshoot, peak response time and response time are better than the other two control strategies.