Optimal design of an interior permanent magnet synchronous motor for electrical vehicle applications

Interior permanent synchronous motor (IPMSM) is a desirable solution for electrical vehicle (EV) traction applications due to its high power density and high efficiency. In this paper, an IPMSM with V-shaped magnets on the rotor is investigated. The shape of slots which contain the magnets is optimized in order to reduce the cogging torque and to maximize the output torque per ampere. The torque and its ripple are also analyzed. Both theoretical analysis and finite element analysis (FEA) are made to verify the optimization.