Based on analysis of the ampere conductor harmonics of pole changing windings and the adjusting wave with Fourier Transformation,a discussion has been done in the paper on the symmetry,M. M. F.

• 在用傅氏变换分析变前极绕组安导波及其调制波基础上 ,讨论了用逐相安导调制法得到的变后极绕组的对称性、磁势谐波含量、磁势主波旋转方向及变极方案择优等