自动门
自动门:异步电动机的旋转原理
发布时间:2013/10/28

自动门讯:
异步电动机的旋转原理
    1)旋转磁场。在空间上互差2Kl3电角度的三相定子绕组Ul-Uz、V\ -Vz、Wl-
Wz中通入在时间上互差27r/3相位角的三相交变电流i。、zp、fw后,它们合成的磁场是一
个旋转磁场.

    2)异步电动机的旋转。转子绕组切
割旋转磁场,可以看作是磁场静止,转子绕组向反方向
旋转切割磁力线,由右手定则可判断转子绕组中的电流
方向。载流的转子绕组在磁场中受到电破力F的作用,
形成电磁转矩T,根据左手定则可判断丁的方向
在丁的作用下转子“跟着一定子的旋转磁场旋

转起来。
    3)转差率。由于转子绕组和旋转磁场之间必须要有相对运动,转子绕组才能切割磁
力线,才能有感应电流产生,进而产生电磁转矩使转子旋转。
    电动机在额定状态时,转子转速n通常与no相差不大,因此额定转差率一般都比较
小,其范围SN—0. 01~0. 05之间。
    转差率s是异步电动机的一个基本参数,它对电动机的运行有着极大的影响,其值越
大,转差也越大,转子绕组切割磁力线的速度也越大。转子绕组中的感应电动势Ez.、感
应电流Iz.和频率f2郝会增加,转子产生的电磁转矩T也会增加。因此,转子绕组中的
Ez,、J:,及它们的频率f、电磁转矩丁的大小,在一定的范围内随5的增加而增大(转子
回路的有些参数带有下标s,表示该参数的大小与转速有关)。
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