Optimization Design of Surface Permanent Magnet Synchronous Motor with Hybrid Magnets Using Analytical Method

In this paper, the surface permanent magnet synchronous motor (SPMSM) which uses hybrid magnets to generate sinusoidal air-gap magnetic field is designed and analyzed. Additionally, an optimization based on analytical method is introduced, aimed at significantly reducing the motor's design cycle. Firstly, a fast analytical method is proposed for SPMSM with NdFeB and ferrite hybrid magnets. And the accuracy of the method is verified by comparing with the finite element method (FEM) results. Building upon the analytical model, a global optimization method is proposed, with torque ripple, output torque, and cogging torque considered as optimization objectives. The optimization focuses on tuning the polar arc coefficient of the magnet. Subsequently, FEM validations of the optimization model are conducted to affirm the effectiveness of the proposed design and optimization method. The results demonstrate the practical applicability and efficiency of the proposed analytical and optimization methods in enhancing the performance of SPMSMs.