前言:近年来,随着煤矿生产机械化水平的提高,设备装机功率大幅增加,电机的启动、调速和经济运行成为迫切需要解决的问题。以前,我们是基本采用电气软起动装置来解决启动问题,但由于软起动装置不具备在线控制功能,所以电机调速和经济运行问题一直未得到很好的解决。目前,我们在 Preface: In recent years, with the improvement of mechanization of coal mine production, the installed power of equipment has increased greatly. The starting, speed regulation and economical operation of the motor have become urgent problems to be solved. In the past, we basically used the electrical soft start device to solve the start-up problem. However, because the soft start device does not have the online control function, the problem of motor speed regulation and economic operation has not been solved well. At the moment, we are there