102年高考電機機械第五題 - 高考

By Freda
at 2013-07-10T13:00
at 2013-07-10T13:00
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
題目:設有一50HP, 460V, 60Hz, 865rpm的三相感應
電動機,連至三相, 460v, 60Hz電源,於額定輸出
下運轉,此時輸入功率和輸入電流分別為43.75KW
和61A. 已知換算至定子側每相等效電路R1=0.1
歐姆,請額定轉述時的旋轉損失1050W,試求此感
應電動機滿載時的功率因數及效率, 轉子銅損,
鐵損?
SOL:
功因=43.75KW/(3*265.58*61)=0.9
效率=(746*50)/43.75K=0.8526
可是題目沒有極數,就不能求轉速差,
還是有其他方法可以求轉子銅損和鐵損?
請各位高手解惑一下
THX
--
題目:設有一50HP, 460V, 60Hz, 865rpm的三相感應
電動機,連至三相, 460v, 60Hz電源,於額定輸出
下運轉,此時輸入功率和輸入電流分別為43.75KW
和61A. 已知換算至定子側每相等效電路R1=0.1
歐姆,請額定轉述時的旋轉損失1050W,試求此感
應電動機滿載時的功率因數及效率, 轉子銅損,
鐵損?
SOL:
功因=43.75KW/(3*265.58*61)=0.9
效率=(746*50)/43.75K=0.8526
可是題目沒有極數,就不能求轉速差,
還是有其他方法可以求轉子銅損和鐵損?
請各位高手解惑一下
THX
--
Tags:
高考
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