Design and Analysis of a Spoke-Type Hybrid Permanent Magnet Motor for Electric Vehicles

This paper proposes a new spoke-type hybrid permanent magnet brushless (H-PMBL) motor for potential applications in electric vehicles, where the high-energy rare-earth PM and the cost-effective ferrite-PM are combined. In order to realize low-cost design and improve the operating points of the rare-earth PM and the ferrite-PM, the proposed motor is designed based on the calculation of PM cost and analysis on the operating points. Moreover, to fairly estimate electromagnetic performances of the H-PMBL motor, a conventional spoke-type non-rare-earth ferrite-PMBL motor with the same overall dimensions is also analyzed and compared using the finite element method. The simulation results indicate that the H-PMBL motor cannot only retain low PM cost, but also exhibit better flux-weakening ability and enhanced demagnetization withstand capability.