22B-E3P0H204
22B-E3P0H204
首先具体生产机械根据其发热、温升及其负载要求，计算并选择负载功率，电动机再根据负载功率、工作制、过载要求预选额定功率。电动机的额定功率预选好后，还要进行发热、过载能力及必要时的起动能力校验。
若其中有一项不合格，须重新选择电动机，再进行校核，直到各项都合格为止。因此工作制也是必要提供的要求之一，若无要求则默认按常规的S1工作制处理；有过载要求的电机也需要提供过载倍数及相应运行时间；异步鼠笼型电机驱动风机等大转动惯量负载时，还需要提供负载的转动惯量及起动阻力矩曲线图来校核起动能力。
以上关于额定功率的选择是在标准环境温度为40℃前提下进行的。若电动机工作的环境温度发生变化，则对电动机的额定功率进行修正。根据理论计算和实践，在周围环境温度不同时，电动机的功率可粗略地按下表相应增减。
因此气候恶劣地区还需要提供环境温度，例如印度，环境温度就需要按50℃进行校核。此外，高海拔对电机功率也会有影响，海拔越高，电机温升越大，输出功率越小。并且高海拔使用的电机还需考虑电晕现象的影响。
对于目前市场上电动机的功率范围，谨列举几个数据以供参考。
直流电机：ZD9350（磨机） 9350kW
异步电机：鼠笼型YGF1120-4（高炉风机） 28000kW
绕线型YRKK1000-6（生料磨机） 7400kW
同步电机：TWS36000-4（高炉风机） 36000kW（试验机组达到40000kW)
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