摘要：就《电机学》流行教科书中线圈组和相绕组的磁势谐波成分分析方法，进行了梳理。 该分析方法可分为两种：直接法和迂回法。就双层短距绕组相磁势中不含偶次谐波成分，给出了详细的解析证明。证明过程表明，之所以有此结论是因为：N极线圈组和S极线圈组的偶次谐波大小相同、相位相反，从而相互抵消。
关键词：交流电机；双层短距绕组；相绕组；磁势；谐波成分
Abstract: The analysis methods of coil groups and phase windings MMF harmonic components in current textbooks of 《electrical machines》 were carded in this paper. The methods can be divided into two kinds: immediate method and roundabout method. The detailed analytic demonstration of the conclusion that there are no the even order harmonic components in the MMFs of phase winding with twolayer shortpitch coils. The process of the proof shows that it leads to the conclusion that the even harmonics of the Npole coil winding groups and the Spole coil winding groups are of the same magnitudes, the opposite phases and zero sum.
Key words: A C machines;  twolayer shortpitch windings; phase winding;  MMF;  harmonic components