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中小型异步电动机的最高效率在额定功率的75％左右,而最大功率因数值则是在额定负荷附近,因而,根据机械负荷,合理地选用电动机,不但能提高效率,节约用电,而且对提高电网的功率因数也有一定好处。但是,因为在设备起动时需要很大的转矩,所以设计时电动机容量都选得偏大,可是,一经启动后,负荷便很快减小,根据我处的统计及综合全国的有关资料来看,目前使用中的中小型电动机有很大一部份,它的负荷只占额定功率的55％左右,而其他一般多在额定功率的40％及其以下,所以功率因数是很低的,因为:
The maximum efficiency of small and medium asynchronous motors is about 75% of the rated power, while the maximum power factor is around the rated load. Therefore, using the motor reasonably according to the mechanical load can not only increase the efficiency, save the power but also improve the efficiency The power factor of the grid also has some benefits. However, because of the large torque required to start the equipment, the design of the motor capacity are selected too large, but once started, the load will soon be reduced, according to my statistics and comprehensive national data Look, the current use of small and medium-sized motor has a large part of its load only about 55% of rated power, while others are generally more than 40% of rated power and below, so the power factor is very low, because: