Tap chi khoa hgc trUdng Dgi hgc Quy NhOn - Tdp IV, sd 2 ndm 2010
IfNG DVNG Wb HINH
T R I / 6 N GDE NGHIEN ClfU CAC YEU TO
A N HHlfdNG DEN
DO L ^ NLl^C
DONGCCf
K H 6 N G
DONG
BOTUYfeN Xf NH
TRUdNG MINH TAN", DOAN THANH BAO"
l . D A T VANDE
Dong ed khdng dong bo tuyen tinh lam viec dtfa ti-dn bien ttfdng cam dng dien ti^
[2], ve ban chat gid'ng nhtf dong ed quay thong dung. TCr trtfdng chay trong khe hd khong khi tac dung vdi dong dien iJng ti-ong phan tiid cS'p (eon goi la rotor) sinh ra Itfe tif ed xu btfdng keo phan dong trong DTT ebuye'n dong tinh tid'n van td'c v. Life tCr cd bai thanh phan ed ban, life tid'p tuyd'n (TT) eon goi la life day va life phdp tuyd'n (PT) eon goi la Itfc doc. Mat khae, do mach t^ hd ndn tCf tiiong khong bdn tue tif ctfc nay dd'n eife khae ma nd bi eat ra d doan diu va doan cuo'i lam tii' trtfdng trong dong ed mat dd'i xdng (Hinh 1) va goi la hidu dng dau cuo'i [1]. Thdm vao do, cd stf trd eua dong didn xoay trong mach thd cap (Hinh 2) gay ra sde tuf dong khong sin. Day la mot so' dac diem ridng trong DTT ehi ra stf khae biet so vdi dong ed khong d6ng bo quay va lam thay ddi quan diem ve pbtfdng phap dieu khien vectd dong cd truyen thd'ng vdi gia thid't sde tuf dong sin. Ngoai ra, cac tham so'khae nhtf btfdc eife, so'eife, didn trd suat eiia td'm kim loai din didn phan thd cap, day quan phan sd cap, khe bd khong khi,... diu ed nhifng anh htfdng nha't dinh dd'n dac tinh life eua dong ed.
De cap dd'n van de nay, cac ngbidn cdu [3-6] da dng dung ly thuyd't trtfdng didn tuf de xay dtfng mo binh trtfdng cho mot so' DTT. Noi dung eua bai bao la dng dung mo binh trtfdng de khao sat eac anh btfdng ciia bidu dng dau cuo'i va dong xoay, dp din didn phia thd cS'p, do ldn khe bd khong khi dd'n do ldn life eua DTT. Trdn cd sd phan mem FEMM 2D [7], pbtfdng phap phIn tuf hii'u ban dtfdc sd dung trong ngbidn cdu nay.
Hinh 1. Phdn bdmdt do tvt thdng trong khe hd khdng khi
Hinh 2. Mat do ddng dien xody trong tdm nhdm phia thvC edp
36
IKUUrNUMlTNtl lJ\r*,z^^r%.i^ i i x ^ ^ -2. PHAN TlCH TRl/dNG
D O N GCd
K H 6 N G D 6 N G B 6TUY^N TfNH DdN BifeN
Thid't lap md hinh trtfdng di$n ttf dd phSn tich trtfdng DTT ddn bien, ta xu^t phat tir mo binh trtfdng di$n tiT tdng qudt vi^t cho ttf th^ vectd v^ A didn tb^ vo btfdng 9.
V M - . / / ^ - c T / / ^ = - / / 7 (1)
^ dt^ Bt
V V - £ / / - ^ - C T / / - ^ = - - (2)
Trong dd: e-bing so' di$n mdi (Fm'); ^x-be sd tif thIm (Hm'); o-dien din suSft (Q-'m'); p-mat dO di#n tich kbd'i (Cm'^).
Dtfa v^o (1) vd (2), xdc dinh dtfdc:
Vectd edm dng tfif: B = VxA (3) Vectd ctfdng dd tif trtfdng:
H=-(VxA) (4) M
Vectd mat do dong didn din:
j=Wx\
VJCA(5)
Life dtfdc xac dinh theo pbtfdng phap tenxd dng suat Maxwell
F = \OxB--H^gradM)dV = frdS = jfdV (g)
Vdi? = (S.n)5-|/zf/'.n (7)
n la vectd phap tuyd'n ddn vi.
Bai toan trtfdng dtfdc giai bang pbtfdng phdp phan ti3f hiJu ban tren cd sd cbtfdng trinh FEMM. Thuat toan dtfdc xay dtfng dtfa vao tiiuat giai song song, giai be phtfdng trinh Maxwell vdi cac mien eon dtfdc phan chia thanh cdc tam gide. M6i phan td dtfdc lam gan dung bang noi suy tuyd'n tinh cda gid tii tai 3 dinh ciia tam giac. Bai todn drfdc tbtfc hidn qua cac phan:
- Phan tiln xuf ly: Thid't lap md hmb, dac tinh vat lieu, dieu kien bien, cac thdng so ve dong didn, tao Itfdi.
Phan xuf 1^: Giai bai todn bang cdc pbtfdng phdp sd, phtfdng phdp lap de xac dinh nghidm tai ede nut Itfdi.
- Phan hau xuf ly: Khai tbde kd't qua.
Cae tham so eua DTT ddn bidn 3 pha: Didn dp 380/220V dd'u A/D; Tan sd
f = 50Hz; sd crfc p = 2; Chieu dai eua loi thep phan sd ed'p L^ = 126,3mm; Btfdc crfc
LfNG DUNG M 6 HINH TRUING D^ NGHIEN CLfU CAC YEU T 6 ANH HlfdNG 37 X = 63,15mm; Do rdng eua loi thdp phan sd cap W^ = 200mm; Chieu cao ciia ranh b^ = 30,3mm; Chiiu cao ciia gdng h = 14,6mm; Do ldn khe bd khong kbi 6 = 5mm;
Chiiu day td'm nhdm d = Smm.
Kd't qua phan tich: Mo binh phdn bd mdt dO ttt thdng ti-ong DTT ddn bidn, ffinb 3.
«,WU*<V1 '••JXUNHOQl OLKrooi a.nirao]
7 6T7r001 0 120* 031 f 226V-00] ? 6T7r031 Attte-QOl s . n 4 e « i
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•1,4U»'<]01 ?419«O01 4.'Slto^l 4.WIVO0I 4.0W>-00t 4.5U*<X)1 ).4U»-O0l 4X)M*O01 l,ttl•^»I -MT^rri 2 TIDWIOI ilhlo-ff'l 2S»t-<Xn ?7lC*M10l IMlbt^Cn : Z -TSAp-cni i m r - « a l-MHrOOl ao3M-ao3 i.3n«-aoi -tn-oaQnoxi 4*)iti»'aa2
not IM, THto
Hinh 3. Md hinh phdn bdmdt do tU thdng trong DTT don biin vdi td'c do 6m/s
3. ANH HUdNG CUA CAC THONG SO DEN DAC TINH L U C
3.1. Anh hifdng cua dO ldn khe hd khong khi
Do ldn khe bd khdng khi (6) dtfdc thay ddi theo ede gid tri 0,5mm; 2,5mm; Smm va 7,5mm. Ung vdi mdi vung td'c do ldm vide khae nhau tbi mdc do anh btfdng eua 8 dd'n do ldn life la khde nhau. Stf bid'n thidn eua hai thanh phan Itfc TT va Itfc PT ciing khde nhau. Cu tiie, kbi td'c dd Im/s, do ldn life tid'p tuyd'n va phdp tuyd'n suy giam gan nhtf tuyd'n tinh theo 5 (Hinh 4a). Khi tde do 6m/s, suf suy giam nay ed stf khde biet, mu'c do giam cua thanh phan life PT ldn hdn so vdi thanh phan Itfc TT (Hinh 4b). Dieu nay vln dung trong trtfdng hdp DTT lam vide trong viing td'c do eao hdn.
600
500
.... 400 z,
§.300 200
100
. , J .
* i . i
—•-LucTT
—•—LircPT ..
p"-! 1
i l^'^^i^
1 1
1 1 i
3S0
300
250
~ 200
150
100
50
0
.V
^
.*
; i
1 : i
•N ; ;
—.—Li/cTT
- » - L I A P T
i ' "H-^^
y-—^^^p^.
1 1 i 0.5 2.5 5.0
Khe hv khong khi (mm)
0,5 7.5
2.5 5.0 Khe h i ' khdng khf (mm)
7.5
a) b)
Hinh 4. Anh hudng cda do ldn khe hd khong khi vdi td'c do a) Im/s; b)6m/s
38 TRUdNG MINH T X N , D O A N THANH BAO
3.2. Anh hiring cua dO din di^n phfa thd* edp
Didn trd cua ta'm nhdm phIn thd ed'p Id dd'i ttfdng chiu tde dong eua sif thay ddi nhidt do m6i trtfdng xung quanh vd bi$u dng nhidt gdy ra bdi ddng dien xody. Gid tri didn trd dtfdc xdc dinh theo cdng tbde:
^ ^ H 5 i ^
rdm (8)
' 234,5+ /,,,
Trong dd, R^d^-gi^ tri danh dinh dng vdi nbi^t dd t^^^, R^-gid tri tbifc dng vdi nhidt dot
Stf bid'n ddi gid tri didn trd pbIn thd ed'p ldm dnh htfdng den do din dien cua tam nhdm. Ngbidn cdu dnh btfdng eua nd dd'n ede ddc tinh life Id can thiet. ffinb Sab, trinh bay stf thay ddi eua life TT vd life PT dd'i vdi dd din didn phia tiid cap tai td'c do Im/s vd 6m/s.
400 ' 350 • 300 •
= 250 • o
* • 2 0 0 •
1 5 0 •
1 0 0 •
5 0 •
0 -
• - - ,
"::sir::;:,
_ » • ^ , >:
1 1 1
— • - L M C T T - • — L M C P T
1^..' •' - « — - ^ . , ^ _ ^
JTT"-"
1 1
200 •
ISO
100 •
SO
1.5 2.5 35 4.5 55
• • 1 ', 1
•
• r 1
— • — L u c n - • - U i e P T
;
i .:!-... i i
n~^~i~*'"i~H--
i 1 i 1
&p dan dien (lOlSAn) 1.5 2S 35 4 5 55
a) b) Hinh 5. Anh hudng cda do ddn dien vdi td'c do a) Im/s; b) 6m/s
Kbi dp din didn phia thd ed'p tiiay ddi theo cdc gid tri 15MS/m, 25MS/m,..., 55MS/m. Thanh phan life PT bi suy giam ddng ke ca trong viing td'c do tiia'p va eao, thdnh phan life TT cdng it tiiay ddi kbi DTT lam vide ti-ong vung td'c do cdng tiia'p.
3.3. Anh htfdng ciia trg dong di^n xoay trong phIn thtf c§'p va tinh khong dd'i xtfng cua ttf trtfdng
Khi DTT chuyen dong vd phia trtfdc, ludn ed thdnh phan trd cua dong dien xody cam dng trong ta'm nhom khong nam ti-ong mien bao phu giifa phan sd ed'p va tiid ed'p.
Mat khde, do mach tif bd vd vi tri ttfdng ddi cua ede pha khde nhau ndn mat do tif tiidng
ldn nha't eua mdi pha trong phan sd ed'p cung khde nhau. ffinb 8 minh boa stf phdn bd
mat do tiif tiiong ti-ong khe bd khong kbi kbi ede pha dtfdc kich tiiieb ridng re. Didu nay cho
tha'y, cd stf khde nhau ddng ke trong phan bd mat do tiif tiidng gii^a cdc pha cda DTT.
IfNG DUNG
M 6 HINH TRU^NGDE
NGHI£NCtfU cAc Y^U TO
ANHHUdNG 39
a) b) C)
Hinh 6. Phdn bdmdt dd tit thdng a) pha a; b) pha b; c) pha cCbinb VI nhifng yd'u td nay, gay ra hidn ttfdng md't dd'i xufng cua tif trtfdng ti-ong DTT.
Kbi tde do lam vide cdng eao tbi dnh btfdng hidu dng dau eudi vd ddng xody cdng manh, kha nang md't ddi xdng tif trtfdng cdng ldn vd sif suy giam life cdng nhidu, ffinb 7.
3.0 6.0 Toe dp (m/s)
Hinh 7. Quan hi giita td'c do vd lUc
4. KET LUAN
tfng vdi mdi vung td'c do lam vide khde nhau tbi mufe do anh htfdng eua 6 dd'n do ldn Itfc la khde nhau. Khi td'c do cdng tdng, mdc do thay ddi thanh phan Itfc TT cdng giam.
Do din didn phia thd ed'p ed anh btfdng dd'n do ldn eua life mpt cdeh dang kd.
Thanh phan Itfc PT suy giam manh ea trong vung td'c dp tha'p vd eao, thanh pbIn life TT cdng It thay ddi khi DTT lam vide trong vung td'c dp cdng thd'p.
- Hidn ttfdng trd ddng didn xoay trong phan thd ed'p va tinh khdng ddi xdng ciia tuf trtfdng trong DTT gay ra hidn ttfdng suy giam dd ldn life. Khi tde dp cdng tdng, kha ndng md't ddi xdng eua tuf tiofdng cdng ldn vd stf suy giam dp ldn life cdng manh
Day cd the xem la nen tang ed ban cho nghidn cdu DTT de tid'n hanh phan tich
cdc trang thdi dn dinh khi dpng cd lam vide vd tbtfc bidn md binh dieu khien pbii hdp.
40 TRUONG MINH TXN , DOAN THANH BAo
T A I LifiU THAM K H A O
[1] T. M. Td'n, N. T. Cdng, L. V. Doanh, Nghiin cdu dnh hudng cda hi$u Ung ddu cudi trong d^ng co khdng dSng b0 tuyin tinh. Tap chi KH &. CN cdc trtfdng dai hoe kj^
thudt, sd 66 (2008), 63-67.
[2] J. F Gieras, Linear Induction Drives, Oxford University Press, Ine, New York, (1994).
[3] C. T. Liu, S. Y. Lin, Y. Y.Yang, Flux modeling and analysis of a linear induction motor for steel mill non-contacting conveyance system application. Journal of Magnetism and Magnetic Materials 290-291, (2005), 1359-1362.
[4] Y. Nozaki, T. Koseki, Analysis of linear induction motor for HSST and linear metro using finite difference method. The University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo, JAPAN, (2006), 113-0033.
[5] T. Sadauskas, A. SmilgeviCius, Z. Savickiene Distribution of Magnetic Field of Linear Induction Motor, ISSN 1392-1215, electronics and electrical engineering, Nr. 4(2(X)7).
[6] H. Yu, B. Fahimi, An investigation on asymmetry effects in linear induction machines;
Applied power electronics conference, APEC 2007-Twenty second annual IEEE Feb, (2007), 390-395.
[7] D. Meeker; Finite Element Method Magnetics. User's Manual, March 17 (2003).
http://femm.berlios.de
SUMMARY
APPLICATION OF FIELD MODEL TO INVESTIGATION ONTO INFLUENCE OF ELEMENTS ON FORCE MAGNITUDE OF LINEAR INDUCTION MOTOR
Truong Minh Tan, Doan Thanh Bao In the paper die elecfromagnetie field analysis on single sided bnear induction motor (LIM) is presented. The finite element simulations are performed in the 2D domam of the analyzed motor, by using tiie Finite Element Metiiod based software FEMM. It is started with field calculations and the computational results are used to determine force characteristics of single sided LIM. Special attention will be paid to the magnetically produced forces and their dependence of trailing eddy current effects and magnetic asymmetry, the air gap length and the secondary electric conductivity. The presented characteristics are considered to be good basis for steady-state analysis of tiie LIM in later research.
"•"Khoa Ky thuat vl C6ng nghd, Tnfdng Dai hoc Quy Nhdn 170 An DtfcJng Vtfdng-Quy Nhdn-Blnh Dinh
Ngay nhan bai: 16/01/2010; Ngay nhin dSng: 16/03/2010.
