102年高考電機機械第五題 - 高考

By Victoria
at 2013-07-10T22:19
at 2013-07-10T22:19
Table of Contents
※ 引述《Q66 (阿華)》之銘言:
: ※ 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
: pag = pi - (i^2R1) -Pcore ---(1)
: pe = po + 外損
: pag = pe + Prcu ---(2)
: 由(1)和(2)將pag聯立 得(3)
: 效率 = po / po + Prcu + Pscu +Pcore + 外損 ---(4)
: (3)和(4)聯立就可以得解。
: 剛想的,不知對不對。
Pinv=(1-s)Pag-------------------(1)
Pinv=P損失+Po(Po=746*50)--------(2)
=>解(1),(2) S可求解,後面用功率潮流可解
Hint:1.P銅=S*Pag
2.定子銅損計得是=3*i^2 r1(重點)
今年題目好活陷阱好多!!
希望我日行一善可以上高考!!YA
--
: ※ 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
: pag = pi - (i^2R1) -Pcore ---(1)
: pe = po + 外損
: pag = pe + Prcu ---(2)
: 由(1)和(2)將pag聯立 得(3)
: 效率 = po / po + Prcu + Pscu +Pcore + 外損 ---(4)
: (3)和(4)聯立就可以得解。
: 剛想的,不知對不對。
Pinv=(1-s)Pag-------------------(1)
Pinv=P損失+Po(Po=746*50)--------(2)
=>解(1),(2) S可求解,後面用功率潮流可解
Hint:1.P銅=S*Pag
2.定子銅損計得是=3*i^2 r1(重點)
今年題目好活陷阱好多!!
希望我日行一善可以上高考!!YA
--
Tags:
高考
All Comments

By Blanche
at 2013-07-14T13:08
at 2013-07-14T13:08

By Tracy
at 2013-07-18T20:44
at 2013-07-18T20:44

By Olga
at 2013-07-20T20:41
at 2013-07-20T20:41

By Oliver
at 2013-07-22T14:28
at 2013-07-22T14:28

By Doris
at 2013-07-23T18:12
at 2013-07-23T18:12

By Oliver
at 2013-07-25T23:29
at 2013-07-25T23:29

By David
at 2013-07-30T00:30
at 2013-07-30T00:30

By Skylar Davis
at 2013-07-30T15:07
at 2013-07-30T15:07

By Bennie
at 2013-07-31T19:07
at 2013-07-31T19:07

By William
at 2013-08-02T13:20
at 2013-08-02T13:20

By Jacob
at 2013-08-07T03:49
at 2013-08-07T03:49

By Andrew
at 2013-08-09T14:55
at 2013-08-09T14:55

By Olive
at 2013-08-10T11:23
at 2013-08-10T11:23

By Suhail Hany
at 2013-08-14T03:10
at 2013-08-14T03:10

By Susan
at 2013-08-14T07:15
at 2013-08-14T07:15

By Rachel
at 2013-08-19T06:33
at 2013-08-19T06:33

By Enid
at 2013-08-23T03:30
at 2013-08-23T03:30

By Annie
at 2013-08-25T22:49
at 2013-08-25T22:49

By Ula
at 2013-08-26T10:39
at 2013-08-26T10:39

By Gary
at 2013-08-29T20:22
at 2013-08-29T20:22

By Zanna
at 2013-08-30T19:16
at 2013-08-30T19:16

By Edward Lewis
at 2013-08-31T18:53
at 2013-08-31T18:53
Related Posts
102高考中會&普考會計

By Elizabeth
at 2013-07-10T21:57
at 2013-07-10T21:57
102 高考工程數學

By Margaret
at 2013-07-10T21:40
at 2013-07-10T21:40
102高考中會第16題

By Mason
at 2013-07-10T21:16
at 2013-07-10T21:16
財稅 高考租各第15題 普考財政第5題

By Tristan Cohan
at 2013-07-10T21:10
at 2013-07-10T21:10
102高考 行政法 第7題

By Megan
at 2013-07-10T19:26
at 2013-07-10T19:26