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分段供电交流直线电机三相互感不对称分析及抑制

, PP. 81-88

Keywords: 直线电机,气隙磁场,互感不对称

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Abstract:

对两种绕组形式的长初级分段供电直线电机的气隙磁场及互感不对称问题进行了研究。在考虑谐波磁场的前提下,解析推导了电机的相磁场分布及自感、互感的解析表达式,并通过有限元仿真分析,验证了求得的解析表达式的正确性。分析发现,对于常规绕组电机,互感不对称的原因是未通电段铁心导致电机气隙磁场中存在脉振偏置分量。互感不对称程度的大小,则取决于通电段与未通电段相对长度的大小。对于新型绕组电机,气隙磁场中不存在脉振偏置分量,互感不对称的原因是三相绕组排布在物理结构上的不对称,互感不对称程度的大小仅取决通电绕组的极数。相对常规绕组,新型绕组可有效减少电机互感不对称的程度。

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