AB 1784CF128單相電動機只有一個繞阻，轉(zhuǎn)子是鼠籠式的，當單相正弦電流通入定子繞阻時，電動機就會產(chǎn)生一種交變磁場，這個磁場的強弱方向隨時間作正弦規(guī)律變化，但在空間位置上是固定的，所以又稱這個磁場為交變磁場，這個交變磁場可分為兩個以相轉(zhuǎn)速、旋轉(zhuǎn)方向相反的旋轉(zhuǎn)磁場，當轉(zhuǎn)子靜止時，這兩個旋轉(zhuǎn)磁場在轉(zhuǎn)子中會產(chǎn)生兩個大小相等方向相反的轉(zhuǎn)矩，使得合成轉(zhuǎn)矩為0。

　　所以電動機無法旋轉(zhuǎn)當我們用外力使電支機向某一方向旋轉(zhuǎn)時，（如順時針方向）這時轉(zhuǎn)子與順時針方向的旋轉(zhuǎn)磁場間的切割磁力線運動變小，轉(zhuǎn)子與逆時針方向的旋轉(zhuǎn)磁場間的切割磁力線運動變大，這樣轉(zhuǎn)子就會以順時針方向旋轉(zhuǎn)起來，因轉(zhuǎn)子所產(chǎn)生的總電磁轉(zhuǎn)矩不再是0。

　　要是電動機能自動的旋轉(zhuǎn)起來，我們要在定子中加一個起動繞阻。起動繞阻與主繞阻在空間位置上相差90度，起動繞阻要串一個起動電容，使得與主繞阻的電流在相位上差90度，即所為的分相原理，這樣兩個在時間上相差90度的電流，通入兩個在空間上相差90度的繞阻中，將會在空間上產(chǎn)生（兩相）旋轉(zhuǎn)磁場，在這個磁場的作用下，轉(zhuǎn)子就能夠自動起動。

AB 1784CF128 

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