不少读者反映，异步电动机的发电状态，要是囫囵吞枣地去理解，似乎不难：转子电流方向反了，就变成发电状态了。但仔细思考起来，却总觉得不大清晰：转子电流方向反了以后，定子电流的相位角是怎样变化的？有没有异步发电机？作者试验了一种通俗而深入的讲解方法，取得了较好的效果。
6ES5703-3CD20发电机是把机械能转换成电能的装置。就是说，用一台原动机（汽轮机、柴油机、水轮机等等）使电机的转子旋转起来，就可以产生电能，即发电。
任何电机都是可逆的，既可以作为电动机，也可以用作发电机。异步电机也不例外，但却有它的特殊性。
异步发电机的特殊性
6ES5703-3CD20首先看一下其他发电机是怎样发电的？
异步电机发电
（1）直流发电机
6ES5703-3CD20直流发电机的定子是磁极，转子是电枢绕组，如图a所示。
当原动机带动转子旋转时，电枢绕组因切割定子磁场而产生感应电动势，经换向器和电刷引出，便得到直流电压。
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