传统的鼠龙型异步电动机启动方式有星三角启动、自偶减压启动、电抗器减压启动、延边三角形减压启动等、这些都是有级减压启动。有级减压启动都存在启动转矩不可调、启动过程中会出现冲击电流、受电网电压波动影响大 软启是现代最先进最流行的电动机启动器。它一般采用16位单片机进行智能化控制。可无级调压至最佳启动电流，保障电机在负载要求的启动特性下平滑启动。在轻载时节约电能 软启实际上是个调压器，只改变输出电压并没有改变频率，这一点与变频器不同。 是用软启应注意的问题 1软启本身没有短路保护 ，为了保护晶闸管，应该采用快速熔断器 2当软启使电动机制动停机时，只是由于晶闸管不导通，使电输入电压为0V在电机与电源之间没有电气隔离，应在软启与电源之间增设断路器 3当软启功率大或台数较多时，产生高次谐波对电网产生不良影响，对电子设备产生干扰。应加旁路接触器 4根据实际需要编程

5满足软启的使用条件

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