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MVI94-GSC-E
当我们用外力使电机向某一方向旋转时(例如顺时针旋转),顺时针旋转时转子与旋转磁场之间切割磁力线的运动变小;转子和逆时针方向的旋转磁场之间的切割磁力线的运动变大。这样平衡被打破,转子产生的总电磁力矩将不再为零,转子将沿推动方向旋转。
单相电不能产生旋转磁场。为了使单相电机自动旋转,可以在定子上加一个起动绕组。起动绕组和主绕组的空间差为90度,要串联一个合适的电容,使起动绕组和主绕组的相位差为90度,这就是所谓的分相原理。
单相异步电动机由定子、转子、轴承、机壳、端盖等构成。单相异步电动机常常被制成小型的电机设备,它的电机容量很小,只需要用单相的交流电源供电,作为驱动用电机,单相异步电动机的功率仅需几瓦、几十瓦或者几百瓦。
单相异步电动机常见的启动方式有以下几种:
直接启动法:这是简单的启动方式,直接连接单相交流电源即可,但启动时需要较大的电流才能达到足够的转矩,启动效果不好,只适用于小功率电机。
电容启动法:在单相异步电动机启动时,通过添加一个电容器,产生的位移电流,形成一个旋转磁场,从而达到启动电机的目的。该方式启动电流小,效果稳定,但只适用于小功率电机。
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