Re: [考題] 102年高考電機機械第五題
※ 引述《letterstar (letterstar)》之銘言:
: [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
[1] 若當題目問的鐵損為定子鐵心損 (這應該是題目所要問的)
http://ppt.cc/4kde
[2] 若當題目問的鐵損為轉子鐵心損
http://ppt.cc/gU5I
(可參考李進雲電機機械題庫集 95年地特三等第2題)
及參考李進雲四等歷屆試題 99年關務四等第4題)
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 1.171.11.89
→
07/11 17:14, , 1F
07/11 17:14, 1F
→
07/11 17:16, , 2F
07/11 17:16, 2F
推
07/11 17:18, , 3F
07/11 17:18, 3F
→
07/11 17:18, , 4F
07/11 17:18, 4F
推
07/11 17:22, , 5F
07/11 17:22, 5F
→
07/11 17:24, , 6F
07/11 17:24, 6F
推
07/11 17:33, , 7F
07/11 17:33, 7F
→
07/11 17:34, , 8F
07/11 17:34, 8F
推
07/11 17:38, , 9F
07/11 17:38, 9F
→
07/11 17:38, , 10F
07/11 17:38, 10F
→
07/11 17:39, , 11F
07/11 17:39, 11F
→
07/11 17:39, , 12F
07/11 17:39, 12F
噓
07/11 17:43, , 13F
07/11 17:43, 13F
→
07/11 17:44, , 14F
07/11 17:44, 14F
噓
07/11 17:46, , 15F
07/11 17:46, 15F
→
07/11 17:47, , 16F
07/11 17:47, 16F
推
07/11 17:50, , 17F
07/11 17:50, 17F
→
07/11 17:50, , 18F
07/11 17:50, 18F
→
07/11 17:53, , 19F
07/11 17:53, 19F
→
07/11 17:53, , 20F
07/11 17:53, 20F
→
07/11 17:54, , 21F
07/11 17:54, 21F
推
07/11 18:01, , 22F
07/11 18:01, 22F
推
07/11 18:02, , 23F
07/11 18:02, 23F
推
07/11 18:04, , 24F
07/11 18:04, 24F
→
07/11 18:04, , 25F
07/11 18:04, 25F
→
07/11 18:06, , 26F
07/11 18:06, 26F
推
07/11 18:08, , 27F
07/11 18:08, 27F
→
07/11 18:08, , 28F
07/11 18:08, 28F
→
07/11 18:08, , 29F
07/11 18:08, 29F
推
07/11 18:12, , 30F
07/11 18:12, 30F
推
07/11 18:29, , 31F
07/11 18:29, 31F
→
07/11 18:31, , 32F
07/11 18:31, 32F
→
07/11 18:33, , 33F
07/11 18:33, 33F
→
07/11 18:36, , 34F
07/11 18:36, 34F
→
07/11 18:40, , 35F
07/11 18:40, 35F
→
07/11 18:42, , 36F
07/11 18:42, 36F
推
07/11 18:44, , 37F
07/11 18:44, 37F
→
07/11 18:46, , 38F
07/11 18:46, 38F
→
07/11 22:26, , 39F
07/11 22:26, 39F
推
07/11 22:33, , 40F
07/11 22:33, 40F
→
07/11 22:34, , 41F
07/11 22:34, 41F
推
07/11 22:39, , 42F
07/11 22:39, 42F
→
07/11 22:39, , 43F
07/11 22:39, 43F
→
07/11 23:18, , 44F
07/11 23:18, 44F
推
07/11 23:20, , 45F
07/11 23:20, 45F
→
07/11 23:31, , 46F
07/11 23:31, 46F
推
07/12 00:02, , 47F
07/12 00:02, 47F
討論串 (同標題文章)