Abstract Aiming at the problem of severe unbalanced magnetic force (UMF) of the switched reluctance motors (SRMs) caused by eccentricity, this paper analyses the radial electromagnetic force’s spatial distribution and frequencies under eccentricity and conduct a compensation method for the UMF. Firstly, the expression of the radial electromagnetic force under eccentricity is derived by using the method of magnetomotive force multiplying permeance, combining with the modification of the permeance. Secondly, the UMF is reduced by applying compensation current to the two stator poles of the permeance-descending phase. The selection of the stator poles and the calculation of the compensation current are decided according to the direction and the value of the unbalanced flux density. Dynamic eccentricity (DE) will produce new frequencies and spatial orders of the radial electromagnetic force, and the static eccentricity (SE) only produces the new spatial orders. The results obtained by the finite element model prove that this method can effectively reduce the UMF without sacrificing the output torque performance.

中文翻译：

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转子偏心对开关磁阻电机径向电磁力特性及补偿的影响

摘要 针对开关磁阻电机(SRM)因偏心引起的磁力不平衡严重的问题，分析了偏心作用下径向电磁力的空间分布和频率，并提出了一种偏心补偿方法。首先，利用磁动势乘以磁导率的方法，结合磁导率的修正，推导出偏心下径向电磁力的表达式。其次，通过将补偿电流施加到磁降相的两个定子极上来降低 UMF。根据不平衡磁通密度的方向和大小决定定子极数的选择和补偿电流的计算。动态偏心（DE）会产生新的径向电磁力频率和空间阶次，而静态偏心（SE）只会产生新的空间阶次。有限元模型得到的结果证明，该方法可以在不牺牲输出扭矩性能的情况下有效降低UMF。