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1 有一台三相、4極、60Hz繞線式轉子感應電動機,轉子每相電阻為1 Ω,滿載轉速為1728 rpm,若要使滿載轉速降為1440 rpm,應該在轉子每相電路串接多少 Ω 的電阻?
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ns = 120×604 =1800 rpm

S = 1800-17281800=0.04

S' = 1800-14401800=0.2

R2S = R2'S'

10.04 = 1+Rx0.2

Rx=4Ω