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空分中的大电机起动一直是电力拖动的重要组成部分。软起动可减小电动机硬起动(即直接起动 )引起的电网电压降 ,使之不影响电网其它电气设备的正常运行 ;可减小电动机的冲击电流 ,冲击电流会造成电动机局部温升过大 ,缩短电动机寿命 ;可减小硬起动带来的机械冲力 ,冲力会加速所传动机械 (轴、啮合齿轮等 )的磨损 ;可减少电磁干扰。软起动使电动机可以起停自如 ,减少空转 ,提高作业率 ,因而有节能作用
Large motor starts in space division have been an important part of electric drives. Soft-start can reduce the motor voltage caused by hard-start (ie, direct start) voltage drop so that it does not affect the normal operation of other electrical equipment in the grid; can reduce the impact of the motor current, the impact of current will cause the motor temperature is too large, Shorten the motor life; can reduce the mechanical impact of hard start, the momentum will accelerate the drive mechanical (shaft, meshing gears, etc.) wear and tear; can reduce electromagnetic interference. Soft-start allows the motor to start and stop freely, reducing idling and increasing operating rates, thus saving energy