关键词: 双励磁永磁游标电机, 电磁特性, 转矩优化, 多目标粒子群优化, 磁场调制

Abstract: Dual-excitation permanent magnet vernier motor ( DPMVM) adopts dual permanent magnet excitation on both stator and rotor, with higher torque density potential than traditional permanent magnet motor. However, its complex structure and magnetic field coupling bring challenges to torque optimization. This paper studies the electromagnetic and torque characteristics of DPMVM. Based on the magnetic field modulation principle, mathematical models of air-gap magnetomotive force,flux density,no-load back electromotive force and output torque are derived,and the harmonic action laws of stator and rotor permanent magnets and the realization conditions of maximum stable torque are obtained. Aiming at maximizing average torque and minimizing torque ripple,key parameters of stator and rotor permanent magnets and statorteeth are selected, and their optimal intervals are determined through a hierarchical strategy combining Latin hypercube sampling,sensitivity analysis,response surface methodology,and multi-objective particle swarm optimization algorithm. Finite element analysis results demonstrate that the presented optimization scheme can significantly enhance the motor’s overall performance,which validates the rationality of the theoretical analysis and the effectiveness of the proposed strategy.

Key words: dual-excitation permanent magnet vernier motor, electromagnetic characteristic, torque optimization, multiobjective particle swarm optimization, magnetic field modulation