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论述三相异步电机调压节电原理及应用范围，介绍了一种以89C51单片机为核心的三相异步电机节电器硬件及软件系统。介绍了一种后沿固定的可控硅触发电路。
Discusses the principle and application scope of three-phase asynchronous motor voltage regulation and power saving, and introduces a kind of three-phase asynchronous motor power saver hardware and software system based on 89C51 single-chip microcomputer. A kind of thyristor trigger circuit with fixed edge is introduced.