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.
一台机组可满负荷运行而同时另一机组可轻载运行。
It can be operATed AT full load while AT the same time another machine may be lightly loaded.
实验室测试结果表明，该方法在电机轻载运行时起到了很好的节能效果。
Laboratory test results show that better energy-conserving effect is obtained in light-loading.
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