ABB主控模塊pm803f
n與n1之間總是存在差異，n1與n的差值稱為轉差，用Δn表示，即Δn＝n1—n。
把轉差Δn與同步轉速n1的比值稱為轉差率或滑差，用s表示，即：
轉速n是一代數量，一般取氣隙旋轉磁場的轉向為轉速的正方向。
根據上面的計算公式，可知當n=n1時，s＝0；當n＝0時，s＝1；當n＞n1時，s是負值；當電機反轉時，n是負值，s＞1。
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