Vibration Analysis and Optimization of E-Type Modular Stator Permanent Magnet Motor Considering Teeth Modulation

As a new motor topology, the modular stator permanent magnet motor has advantages such as high fault tolerance and high torque density. However, its unique stator structure can aggravate the vibration problem of the motor. Therefore, to alleviate the vibration problem caused by the modular stator, this paper presents the vibration analysis and optimization of the proposed new E-type modular stator permanent magnet synchronous motor (ETMS-PMSM) from the perspective of the stator teeth modulation effect. Firstly, the effects of electromagnetic force, the stator teeth modulation effect and its diversity on vibration are theoretically analyzed. On the basis, a hierarchical multi-objective evolutionary optimization method with comprehensive sensitivity analysis is proposed, focusing on the low-order and high-order harmonics of the electromagnetic forces, and the electromagnetic and vibration characteristics of the motor before and after the optimization are compared and analyzed. Finally, a prototype is manufactured and tested to verify the effectiveness of the theoretical analysis and optimization design.