串级调速系统的主要组成部分是线绕式异步电动机，三相桥式整流器和三相可控硅逆变器。

A cascade speed control system mainly consists of a wound asynchronous motor, a three-phase rectifier and a three-phase thyristor (?) inverter.

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极好的抗弯程度、耐磨性，广泛用于串激、风扇、微电机、马达等行业的定子、转子的线圈绕制。

There-fore, it boasts high resistance to flexure to flexure and to wear and is extensively applied in fields of series, fan, micro-motor and motor for wire coling of stator and rot-or.

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