一、概述从六十年代起,可控硅整流元件的问世,可控硅——直流电动机调速系统逐步取代直流发电机——电动机组调速系统在工业领域中获得广泛的应用。它具备了弱电控制,强电输出的优点。但在实际应用中,可控硅输出的整流电压波形差,脉动大,导致电动机工作条件恶化,损耗增大,特别是在低电压,轻负载的情况下尤为严重,影响到 First, an overview From the sixties onwards, the advent of thyristor components, SCR - DC motor speed control system to replace the DC generator - motor speed control system in the industrial field has been widely used. It has a weak control, the advantages of strong power output. However, in actual application, the rectified voltage waveform of the thyristor output is poor and the ripple is large, causing the working conditions of the motor to deteriorate and the loss increase, especially under low voltage and light load conditions, affecting