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基于槽口优化的电动汽车用大功率无刷直流电机齿槽转矩削弱方法

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Keywords: 大功率无刷直流电机,齿槽转矩,槽口偏移,槽口宽度,响应面法

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Abstract:

电动汽车用大功率无刷直流电机由于存在齿槽转矩使整车的性能受到严重影响,本文在不破坏梯形波反电动势(back-EMF)的目标下,利用响应面法(RSM)优化定子槽口偏移角度和槽口宽度抑制大功率无刷直流电机的齿槽转矩,从而提高电动汽车的性能。本文以一台30kW、4极12槽的电动汽车用无刷直流电机作为研究对象,采用试验设计(DOE)方法得到齿槽转矩与定子槽口偏移角度、槽口宽度两个因素之间的数学模型,从而计算出使齿槽转矩最小的槽口偏移角度和槽口宽度最优解组合,最后通过有限元法(FEM)验证了所得结果的正确性。实验结果表明,无刷直流电机的齿槽转矩被有效减小了87.6%,并且反电动势波形仍为平顶宽度不小于120#x000b0;的梯形波。

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