22B-E3P0N104
22B-E3P0N104
电动机的额定转速，是指在额定工作方式下的转速。
电动机和由它拖动的工作机械都有各自的额定转速。在选择电动机的转速时，应注意转速不宜选的过低，因为电动机额定转速越低，其级数越多，体积就越大，价格也就越高；同时，电动机的转速也不宜选的过高，因为这样会使传动机构过于复杂，而且难以维护。
此外功率时，电机转矩与转速成反比。
所以启动、制动要求不高者可从设备初始投资、占地面积和维护费用等方面，以几个不同的额定转速进行比较，后确定额定转速；而经常启动、制动及反转，但过渡过程持续时间对生产率影响不大者，除考虑初始投资外，主要以过渡过程量损耗小为条件来选择转速比及电动机额定转速。例如提升机电机，需要频繁正反转且转矩很大，转速就很低，电机体积庞大，价格昂贵。
当电机转速较高时，还需考虑电机的临界转速。电机转子在运转中都会发生振动，转子的振幅随转速的增大而增大，到某一转速时振幅达到大值（也就是平常所说的共振），超过这一转速后振幅随转速增大逐渐减少，且稳定于某一范围内，这一转子振幅大的转速称为转子的临界转速。
这个转速等于转子的固有频率。当转速继续增大，接近2倍固有频率时振幅又会增大，当转速等于2倍固有频率时称为二阶临界转速 ，依次类推有三阶、四阶等临界转速。转子如果在临界转速下运行，会出现剧烈的振动，而且轴的弯曲度明显增大，长时间运行还会造成轴的严重弯曲变形，甚至折断。
电机的一阶临界转速一般在1500转/分以上，故而常规低速电机一般不考虑临界转速的影响。反之，对2速电机，额定转速接近3000转/分，则需考虑该影响，需避免让电机长期使用在临界转速范围。
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