你可以把这种电动机当作一个旋转变压器，其主要的线圈在固定套管(定子)内，二级导线附在一个内轴(转子)上。
Think of it as a rotating transformer, with the primary windings residing in a stationary casing (stator) and the secondary conductors attached to an inner shaft (rotor).
这使之区别于“同步”发动机。同步发动机在转子中使用永久磁铁而不是一组导线。
That distinguishes them from "synchronous" motors that use a permanent magnet in their rotors instead of a set of conductors.
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