【摘要】 为了削弱磁位波动效应对轮辐式游标永磁电机转矩性能的影响，首先研究磁位波动效应产生机理，基于等效磁路模型推导出空载气隙磁密的解析模型，分析其对气隙磁场调制效果的抑制作用，并利用有限元法验证了转子磁动势和气隙磁密解析模型的准确性。其次，提出了一种基于参数灵敏度分层的多目标优化设计方法，通过综合灵敏度分析法对设计变量空间进行分层降维，根据灵敏度层次选用针对性的优化设计方法，构建出具有高精度的电机性能代理模型。以此为基础，运用多目标遗传优化算法对电机转矩密度、齿槽转矩和转矩波动等进行综合优化设计。最终确定优选设计方案，并通过有限元法验算优化设计的有效性，结果显示，优化后齿槽转矩由28.5 mN·m降至10.3 mN·m,转矩波动由4.9%降至1.6%,平均转矩由0.68 N·m提升至0.83 N·m,电机的输出转矩性能与品质均得到有效提升。更多还原

【Abstract】 To minimize the influence of the magnetic potential fluctuation effect on the torque performances of spoke type vernier permanent-magnet machine(STVPM), the mechanism of the magnetic potential fluctuation effect was analyzed. An analytical model of the no-load air gap magnetic density was derived based on the equivalent magnetic circuit model, and the magnetic potential fluctuation effect on the air gap magnetic field modulation was studied. The accuracy of the rotor magneto motive force and air gap magnetic density analytical model was verified by using the finite element method. Then, a multi-objective optimization design method based on parameter sensitivity dimensionality reduction was proposed. The design variable space was stratified and reduced based on comprehensive sensitivity analysis method, and a high-accuracy performance proxy model was constructed depending on the sensitivity level. Based on the proxy model, the multi-objective genetic algorithm was applied to optimize the torque density, cogging torque, and torque ripple. Finally, the optimal design of the STVPM was determined, and effectiveness of the optimized design was verified by using the finite element method. The results show that the optimized cogging torque is reduced from 28.5 mN·m to 10.3 mN·m, the torque ripple is reduced from 4.9% to 1.6%, and the average torque is increased from 0.68 N·m to 0.83 N·m, which demonstrate that the torque performance and torque quality of STVPM are effectively improved.更多还原