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三相異步電動機的正反轉是由改變其兩個相的接線順序實現的。在正轉時，三相電源的相序為ABC，其中A相接在電動機的主線圈的一個端點上，B相和C相交換接在另一個端點上。這樣，電動機主線圈內形成了旋轉磁場，和轉子內激勵電流形成的磁場相互作用，推動轉子正轉。
反轉時，將B相和C相交換接在另一個端點上，同時將A相接在該端點另一端上。這時，旋轉磁場的方向就反向了，和轉子激勵電流的磁場方向相反，推動轉子反轉。
需要注意的是，在改變兩個相的接線順序前，需要先停止電動機運轉，避免發生電源瞬間電壓升高、電流增大的現象，對電動機和電源造成損壞。
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