KL9100
KL9100
單相電流通過電樞繞組時產生的是脈振磁場而不是旋轉磁場，所以單相異步電動機不能自起動。 為了解決起動問題，單相交流供電的異步電動機實際上往往做成兩相的。 主繞組由單相電源直接供電；副繞組在空間上與主繞組差90°(電角度，等于機械角度被電動機磁極對數除)。 副繞組串聯電容或電阻后再接到單相交流電源，使其中通過的電流和主繞組中的電流有的相位差。 使合成磁場成橢圓形旋轉磁場，甚至可能接近于圓形旋轉磁場。
電動機因此獲得起動轉矩。 利用電阻分相方法的電動機價格低廉，例如副繞組用較細的導線繞制即可，但分相效果較差，且電阻上要消耗能量。 這種電動機在起動并達到轉速后，通常由裝在電動機軸上的離心式開關將副繞組自動切除，以減少電阻上的損耗、提高運行效率。 一般用于起動轉矩要求不高的場合，如小型車床、小型電冰箱等，缺點是不能調速速。 利用電容分相，效果較好，有可能在電動機某一工作點時，使電機合成磁場接近于圓形旋轉磁場，從而獲得較好的工作特性。 為使分相異步電動機獲得較好的起動性能或較好的運行特性或兩者兼有，其所需的電容（量值）是不同的。
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