三相异步电动机均有一个大的起动电流根据不同的电动机该电流的变化范围一般在额定电流的3至5倍之间。降低起动电流的方法有多种多样:
星-三角起动器：
****经过一定的转换时间后，它会将电动机的绕组从星形连接成三角形连接。如果在星形连接下起动，则电动机的电流大约仅占三角形起动电流的1/3，电动机的转矩大约也降低到三角形转矩的1/3。
****缺点：需要6根引线，会产生转换振动，不能根据电动机的情况进行适应的起动，安装相对复杂并化时，在控制柜中占面积大。
变频器：
当采用变频调速装置时，它会将交流线电压转换成直流电压，即能在任何频率下依次转换为某一电压，电动机的速度可以精确调整。由于电压/频率比值几乎不变，这样在相当小的电流值也能达到高的转矩。
缺点：价格昂贵，由于导线的电容量关系，电动机的导线长度就受到一定的限值，可能需要滤波器。由于控制参数多，调试比较难且化的时间长，需要屏蔽连接线。
软起动器：
它能在一个起动时间内通过相位控制把起动电压调节至电动机的额定电压，从而来提高电压，由于电动机的电流与电动机的电压成正比，故起动电流可降低至整定的起动电压的对应值。
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