Topology Optimization of a Consequent-Pole Rotor with V-Shaped Magnet Placement

This paper presents the topology optimization of a consequent-pole permanent magnet (PM) synchronous motor (CP-PMSM) aiming to be applied to refrigerant compressor. Firstly, strategy for improving the output torque of CP-PMSM is discussed while taking into account the PM shape and pole arc. Then a new topology optimization method based on the normalized Gaussian network is used to optimize the CP rotor considering both average torque and torque ripples, through which a novel rotor topology is obtained. The transient performance of optimized model is analyzed by 2D finite element analysis and verified by a prototype. The results show that the performance of the model proposed in this paper is significantly higher than that of the model designed by conventional size optimization and the performance is almost equivalent to the conventional PMSM when saving 20.6% of the PM usage. The model proposed in this paper has a good application prospect in the compressor as a cost-effective solution with less magnet usage.