Speed regulation system using cascade control method with thyristor is a low-cost system, but the classic system has some shortages, such as low power factor, serious harmonic pollution and etc.

晶闸管串级调速系统是一种廉价、简易的调速系统，但是传统串调系统存在着诸如功率因数低、谐波污染严重等弊端。

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

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。

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This paper features a comprehensive survey of all the plans, which are applicable to crane hoists, of the speed control of wound motor rotor thyristor.

本文对起重装置适用的绕线电动机转子可控硅调速各种方案进行了综述。

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