Design and Finite Element Analysis of a Novel Reverse Salient Pole Permanent Magnet Synchronous Motor

摘要

Since traditional permanent magnet synchronous motor (PMSM) with salient pole effect has a lower d- than q-axis inductance, the maximum torque has a power angle higher than 90 degrees, which poses threat to demagnetization when the motor runs under load. To solve the problem, a novel PMSM with reverse salient pole is designed and optimized to realize the characteristic of L-d > L-q in this paper. Firstly, the electromagnetic design of reverse salient pole PMSM is carried out, followed by finite element analysis (FEA) of traditional PMSM and reverse salient pole PMSM. The simulation results show that air-gap flux density and no-load back EMF of reverse salient pole PMSM is closer to sinusoidal wave compared with the traditional PMSM. The danger of permanent magnet demagnetization is reduced due to L-d > L-q. In addition, reverse salient pole PMSM improves the maximum torque and overload capacity and has less loss and higher efficiency in steady-state operation. Finally, the optimal design of reverse salient pole PMSM is carried out. From the comparison of the simulation results, the optimized structure is superior to reverse salient pole PMSM in these performances, which shows that the design is reasonable.