A New Hybrid Permanent Magnet Synchronous Machine with V-shape Spokes

In this paper, a new V-spoke interior permanent magnet (PM) synchronous machine (IPMSM) with parallel configuration of hybrid rare-earth and ferrite PMs is proposed. Comparing to the conventional parallel hybrid PM spoke-type IPMSM, this machine has two sets of spokes per pole where the employed pillar and verge are beneficial for improving the mechanical strength. To investigate the performance, the parallel hybrid PM V-spoke IPMSM is optimized by genetic algorithm using finite element analysis to develop the same torque at lower volume of rare-earth PMs compared to a high-performance double V-shape IPMSM for electric vehicle application. It is shown that at the same torque and reliability, the rare-earth PM volume can be reduced by about 37% which leads to almost 30% reduction of total PM cost.