描述
6ES7416-2FK02-0AB0
当极对数一定时，电机的转速和频率之间有严格的关系，用电机专业术语说，就是同步。异步电机也叫感应电机，主要作为电动机使用，其工作时的转子转速总是小于同步电机。
同步电动机（synchronousmotor）是由直流供电的励磁磁场与电枢的旋转磁场相互作用而产生转矩，以同步转速旋转的交流电动机。
转子转速与定子旋转磁场的转速相同的交流电机。其转子转速n与磁极对数p、电源频率f之间满足n=60f/p。转速n决定于电源频率f，故电源频率一定时，转速不变，且与负载无关。具有运行稳定性高和过载能力大等特点。常用于多机同步传动系统、精密调速稳速系统和大型设备(如轧钢机)等。
同步电动机是属于交流电机，定子绕组与异步电动机相同。它的转子旋转速度与定子绕组所产生的旋转磁场的速度是一样的，所以称为同步电动机。正由于这样，同步电动机的电流在相位上是超前于电压的，即同步电动机是一个容性负载。为此，在很多时候，同步电动机是用以改进供电系统的功率因数的。
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