題組內容

4.6極三相同步發電機之每相輸出瞬時電壓(e)=359.2sin(377t),供應某6極,轉差率(S)=3%,效率(eff)=90%,輸出為15.087Kw的三相感應馬達。此時的瞬時電流(i)=25.4√2 Sin(377t-30゚)。試求
註:

e = EMSin θ = \(\sqrt{2}\)ESin ωt = \(\sqrt{2}\)ESin2 πft

i = IMSin θ = \(\sqrt{2}\)ISinωt = \(\sqrt{2}\)ISin2πft

發電機之輸出功率\( (P) = 3E_{p}I_{p} \cos \theta \)

cosθ為功率因素,

且θ=377t-(377t-30゚)=30゚

(3)發電機轉速(NR)=?