描述
改变转差率这种调速方法只适用于绕线式转子异步电动机，因为通常在转子回路中串联电阻，通过改变转子回路的电阻来改变转差率，以进行调速。一般只有绕线式转子才能够通过滑环和电刷在机外连接调速电阻。这种调速方法功率损耗大、效率低，很少用来调整机床电动机的转速。
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