[考試] 三相感應電動機問題
請問這(3)題目解答，為什麼是用轉子轉速Nr，來反推極數P?
http://imgur.com/a/xv1O2
然後再令P為整數求得同步轉速Ns ?
http://imgur.com/a/WtKxX
謝謝各位指導一下 麻煩了
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