Analysis of a High-Speed Axial Flux Permanent Magnet Motor With Hybrid Magnets for Low Cost

This paper proposes a novel high-speed axial flux permanent magnet synchronous motor (AFPMSM) using hybrid permanent magnets (PMs) to reduce the magnet cost and torque pulsation. Based on a previously reported model with sinusoidal NdFeB PMs, the proposed model is designed with an equal arrangement of ferrite and NdFeB PMs, wherein the hybrid PMs are parallel and vertical to the magnetization direction of the PM. Therefore, three kinds of hybrid PM configurations are adopted for the proposed model. The analysis by the magnetic circuits is firstly carried out. And then the optimal PM configuration for the proposed model is obtained by comparing the electromagnetic performance with the aid of the finite element method.