为了让电机实现了更高效率且可以工况可控的运行，避免造成电机传动系统功率的浪费，变频器应运而生。但由于电机负载类型繁多，对所配变频器的功能需求也是各有不同，那么该如何给电机选择合适的变频器呢？这些都是摆在工程师面前的问题。

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      由于普通变频器在150%额定负载下的过载能力正常运行1分钟，瞬时过载转矩只能达到180% ~ 200%，因此有必要增加变频器的容量，以提高变频器-电机系统的瞬时过载能力。

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