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1 一部8極、220V、60Hz的三相感應電動機,轉子感應電勢之頻率為3Hz,則此時感應電動機的轉速為多少rpm? 104 統測
A 870 rpm
B 865 rpm
C 855 rpm
D 840 rpm

S=f2/f=3/60=5%

nr120fP (1-s)

120×608 (1-5%)=855rpm