轴向磁通永磁同步发电机的优化设计研究

Optimization of axial flux permanent magnet synchronous generator

利用田口方法确定了极弧系数和线圈边宽度是主要影响轴向磁通永磁发电机空载电压基波幅值和总谐波失真度的参数。在考虑磁密谐波的情况下,推导了电动势的谐波绕组系数表达式,结果发现通过优化线圈边宽度和极弧系数可以控制谐波绕组系数的大小。进一步利用响应曲面方法,以空载电压基波幅值最大且总谐波失真度最小为优化目标,寻求了极弧系数与线圈边宽度配合的最优方案,并通过有限元仿真计算验证了优化结果。优化前后发电机目标性能明显改善,证明了此优化方法在轴向磁通永磁电机优化设计中的可靠性。

In this paper, the method of Taguchi method is used to determine the pole-arc coefficient and width of coil- side, which are the main parameters that affect the fundamental amplitude and the total harmonic distortion of the no- load voltage of the axial flux permanent magnet generator. The winding factor with harmonic of electromotive force （EMF） of generators was deduced in the case of considering the flux density with harmonic. The winding factor with harmonic can be controlled by the optimization of the width of coil-side and pole-arc coefficient. By the maximum amplitude of the fundamental harmonic of the EMF and the minimum total harmonic distortion （THD） as the optimizing goal, the optimization scheme of the match between pole-arc coefficient and width of coil-side was found by the response surface methodology, and the optimization results was proved by finite element analysis （FEA） results. After optimization, the performance of the generator was improved obviously, the reliability of the optimization methodology applied in axial flux permanent magnet machine was proved.