Abstract: In order to further explore the influence of different structural parameters on the electromagnetic performance of permanent magnet synchronous motor, Maxwell software was used to design a permanent magnet synchronous motor, and the influence of structural parameters such as the width of the motor slot, the length of the air gap and the width of permanent magnet on the electromagnetic performance of permanent magnet synchronous motor was analyzed.The simulation results show that with the increase of slot width, the base wave amplitude of no-load air gap flux density increases, the base wave amplitude of no-load back electromotive force decreases, and the groove torque increases obviously.With the increase of the air gap length, the base amplitude of the air gap flux density of the motor gradually decreases, and the no-load back electromotive force decreases, but the decrease value is not large.Within a certain range, the air gap length makes the groove torque increase first and then decrease.With the increase of the permanent magnet width, the amplitude of the air gap flux density, the base wave amplitude of the motor no-load back electromotive force and the tooth groove torque all increase.Through the analysis of the influence of different motor structure parameters on electromagnetic performance, it can provide guidance for the design and optimization of permanent magnet synchronous motor.