三相异步电动机的轻载运行，是很不经济的。
The running of electric motor with light load is not economic.
小容量轻载异步电动机在农村市场的应用极其广泛。
Small power asynchronous motor with low load has very extensive application in rural area.
介绍了微机式高压异步电动机综合保护的原理及其装置的设计方法。
Theory and practices of multiple protection for large and middle capacity asynchronous motors;
本文研究的是异步电动机串级调速的原理以及串级调速的机械特性。
The principle and mechanical properties of such speed regulation is discussed is this paper.
因此，对异步电动机节能装置的研究有着重大的经济效益和社会效益。
The study of saving energy in asynchronous machine is very important to economy and society.
因此，对异步电动机节能装置的研究有着重大的经济效益和社会效益。
The study of saving energy in asynchronous machine is very important to economy and society.
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