西门子产品6SE6420-2UD23-0BA1

6SE6420-2UD23-0BA1 

6SE6420-2UD23-0BA1 

单相电机由定子和鼠笼式转子组成，定子上嵌有主绕组和副绕组，主、副绕组在空间上互成90度电角度。副绕组串联了一个运转电容器后与主绕组并联接人电路。

　　当主、副绕组通入单相交流电时，主绕组产生脉动磁场，副绕组在电容器的作用下，产生与主绕组相位超前约90度电角度的脉动磁场。

　　这两个脉动磁场合成一个旋转磁场，推动转子启动运转。

　　单相电机工作原理

　　当单相正弦电流通过定子绕组时，电机就会产生一个交变磁场，这个磁场的强弱和方向随时间作正弦规律变化，但在空间方位上是固定的，所以又称这个磁场是交变脉动磁场。这个交变脉动磁场可分解为两个以相同转速、旋转方向互为相反的旋转磁场，当转子静止时，这两个旋转磁场在转子中产生两个大小相等、方向相反的转矩，使得合成转矩为零，所以电机无法旋转。当我们用外力使电动机向某一方向旋转时（如顺时针方向旋转），这时转子与顺时针旋转方向的旋转磁场间的切割磁力线运动变小；转子与逆时针旋转方向的旋转磁场间的切割磁力线运动变大。这样平衡就打破了，转子所产生的总的电磁转矩将不再是零，转子将顺着推动方向旋转起来。

　　要使单相电机能自动旋转起来，我们可在定子中加上一个起动绕组，起动绕组与主绕组在空间上相差90度，起动绕组要串接一个合适的电容，使得与主绕组的电流在相位上近似相差90度，即所谓的分相原理。这样两个在时间上相差90度的电流通入两个在空间上相差90度的绕组，将会在空间上产生（两相）旋转磁场，

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