Characteristic Analysis and Optimization Design of Permanent Magnet Synchronous Motor with New Rotor Structure

Abstract

In order to solve the problem that the traditional surface-mount permanent magnet synchronous motor (SPMSM) is difficult to effectively utilize the reluctance torque, a new rotor structure based on bonded magnets is studied. By optimizing the shape design of the bonded magnet and using a non-circular cross-section shaft, the SPMSM generates convex polarity, and realizes the synergistic utilization of electromagnetic torque and reluctance torque. Theoretical analysis shows that the structure can obtain the maximum electromagnetic torque and reluctance torque at the same time under the same current phase. The simulation results based on the finite element method show that the output torque of the new rotor structure motor is increased by about 14% compared with the traditional structure under the condition of keeping the volume of the permanent magnet and the driving current unchanged. This study provides a new idea for improving the torque output performance of SPMSM, and has important reference value for the development of next-generation high-performance SPMSM.