分析软起动器的工作原理，结合在离心铸铝机的应用，阐明软起动器这种新型节能技术应用在三相异步电动机上的优越性。

In the light of application to centrifugal casting machine, working principle of soft starter is analyzed and the advantage of this new energy-saving technique of soft starter is presented.

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利用晶闸管、单片机控制技术实现电动机软起动和软制动是目前普遍采用的一种较好的方法，但其成本较高。

Using the technique of thyristor and microcontroller to realize soft start and soft stop for motor is a better method that is adopted at present, but its price is more higher.

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本文介绍了几种适用于大功率电动机起动的软起动装置的工作原理，对其技术、经济性进行了比较，探讨了软起动装置在大型设施中应用的可行性。

This paper introduced some operation principles of soft start for high power electro motors. Comparisons were also made in technical and economic bases to find application in large facilities.

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