22B-E3P0F104
22B-E3P0F104
电动机的额定功率是指输出功率，即轴功率，也称容量大小，是电动机标志性参数。常有人问电机多大的，一般不是指电机的尺寸大小，而是指额定功率。它是量化电动机拖动负载能力的重要的指标，也是电机选型时提供的参数要求。
（为额定功率，为额定电压，为额定电流，cosθ为功率因素，η为效率）
正确选择电动机容量的原则，应在电动机能够胜任生产机械负载要求的前提下，经济合理地决定电动机的功率。若功率选得过大，设备投资增大，造成浪费，且电动机经常欠载运行，效率及交流电动机的功率因数较低；反之，若功率选得过小，电动机将过载运行，造成电动机过早损坏。
决定电动机主要功率的因素有三个：
1）电动机的发热与温升，这是决定电动机功率的主要因素；
2）允许短时过载能力；
3）对异步鼠笼型电动机还要考虑起动能力。
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