Trl:lC quan va trl:le thao a may CNgLT thLfe hi¢n vi~c quan hay thEw rieng. 0 may
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ehung gi6ng nhau nen h~ thong truyen dong deu din thoa mun cae yeu diu : - Ch6 dQ lam vi~c IiI dai hl;m (thai gian nght eo 10'1<, thai gian lam viee), - Duy tri suc cang phOi giua cae h¢p can va giua cac Mr can dau hoac cuoi vai truc thao hOl}e trl,lc quan trang m9i chl"l dQ lam vi~c voi sai so : ~ T < ± 10%, - Duy trt hi(!u so suc eang Clla trl}-c thao hay quan llic dau va llie cuoi kh6ng qua 10% (vi trong qua trinh, dl10ng kfnh ruM thay dOi kea thea t6c do dai va sue cang thay d6i).
Truy€ln dQng trl}-c quan va trl:le thao thl10ng dung d6ng Cd mQt chieu, co the' dH~u chinh t6c dQ a en 2 vung tren va duai toe dQ Cd ban. Trang he dieu chlnh toc d¢ thl10ng dung phan hoi a.m dong di~n. Dieu chlnh toc d¢ de cluy tri sue cang do dUdng kinh rulO thay d6i dl1Qc tien hanh bang BI! thay dOi tU tMng dl>ng ca. Con vi~c dieu chinh de' thay deH toc d¢ can dUc;1e tien hanh bang cach thay deH di~n ap cap cho phan ung d¢ng Cd.
Cac M dieu chinh toe d¢ tr".c quan va trl}-c thao eo th~ la he di~u chinh trl,lc tiep (dieu chinh suc cang qua cam bien sue cang (tensor) dliit trLfe tiep tr~n duong truyen bang thep) hof).C gian tiep (dieu chinh sue cang qua cac thong s6 eo li~n quan gian tiep voi suc cang).
a) Hi? di~u chi"nh true tiep.
Hinh 8-45 cho ket diu khai quat 2 h¢p can lien tiep trang may CNgLT. Cam bien suc cilng dliit tr~n dl10ng truyen cua ba.ng thep se cho tIn hi(!u Wi b¢ dU~u chinh suc cang RT de' dieu chinh toe d6 cac d¢ng ed cha phu hqp v~i suc c.a.ng da d~t. Hlnh 8-46 eho so do eua hi;! dieu chlnh suc cilng rieng re cho tung hQp can. Trong may can LT co 5 hQp can (he NIC - non-interactive controller).
L'!.;~' ,-,'d,;r- ,-,'d,;r- hi e'p friJc Trlle I \ - - - - ' - / I d l l l VIe{- ""dill' oic'1! s"'~~ (dll!? fJofl§.8' ):ev
/:2M'=o.:~ frlle /<lm j/il'f:
_Cam £1&-;
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fflnh 8-46. JI¢ dl~u chinh In,lc 110p sue dIng mily CNglT
b) He di~u chlnh ginn tilp.
Trang h~ nay, vi~c dil!u ehinh sue 'eang thOng qua cAc df,li lugng di~n gian tigp
li~n quan tai suc cang. Suc ca.ng giua d¢ng cd trl:lc thao va h(lp can d~u hay gilla d¢ng Cd trl,lc thAo va hOp can cu6i lifln M vai nhau hOi bH~u thuc:
• O,IP O,IP T = - - = ~v 0, lUI ~v = 0, ICE' + IR,,)I ~v (8-42) trang do : T - suc cang bang thep, [T] ;
158
P, E, U, I - cong sucH, s.d.d. di~n tip, dong di~n di)ng co, [kW, V, A] ; v - t6e d¢ bang thep, [m/s] ;
TJ. - hi(lu suat tr\lc q ui'ln (hay thao) ;
Tn (2-42), th1y ro fa khi t6c dQ bang thep khOng d6i, suc ding ph~ thuQc P, I, E va tham s6 dieu chinh suc cang <--0 the' la cong suat P, dong dien I ha~c dong thai ca s.d.d. E va dong di$n I
Chi ti€t hdn, ta xet qua trinh lam vi(lc cua tr~c thao va tr1,lc quan. Thuang tren m¢t may can, 2 tr1,lc truyen dQng tn 2 dQng Cd rieng nhung dudc cap chung nguon tu 1 may phat. Dong cd tr\lc thao lam viec a ch€ d¢ may phat, t~o rn momen ha.m
M~ ED - EI·
k'" L R, = kct>Ill
tr.ong do : k - M so hang so, ph\! thuoc diu truc dQng Cd ; ¢ - tu thong kich tu ;
ED' E" - s.d.d. cua dQng Cd va may phat ;
2: Ru - t6ng tro m~ch phan ung ; iu - dong mt;leh ph~n ung.
TO: d6, sue ca.ng giUa tr1,lc thao va h9P can dau la 2M
T ~ D ~
trong do D - duang kinh rulo thao.
(8-43)
(8-44) (adsbygoogle = window.adsbygoogle || []).push({});
Khi thao, duang kinh rulo giam dan lam toe d9 dong ed ta.ng dan. Neu gift to thOng khOng doi thi s.d.d. se tang, dong tl1ng, mamen ham tang va sue eang tang Do do ean phai giam toe d9 d¢ng Cd tr\lc thao trong qua trinh thao thea slj giam duang kinh.
DQng Cd trl,lc thao ehi. lam viec (1 che do d¢ng Cd khi thay ruto va chinh de dU:a dau bang thep vao may can
Sue eang duy tri a true thao thubng Ie. 0,4 -7- 3,5T
Khac v{ji dQng cd tr\le thao, d¢ng cd trl,lc quan luon lam viec a ehe d6 d¢ng cd va thu:ang eo c6ng suat Ion hdn (hdn 3000kW) de dam M.o soc eang Ion den 12T a toe d(> 0 -7- 25m/s.
Trang qua trinh quan, du:ang kinh rulo tAng len, keo thea sU: tang toc d(> dai va sue cang. Do Y~y qua trong qua trinh can, phAi dieu chinh gi<lm toe d¢ d(lng cd trl,le qmln thea sU: tang du:bng klnh eua rulo.
Dg nAng cao nAng suAt may can nguQi, ngu:bi ta thubng tang khoi luqng rulo thep, nha d6 giam duqc thbi gian thao tac ph~ (chinh va euon dau vao ruto d6i voi trl}.c qUlln ; ehinh va dU:a dau bang tMp vAn may d6i voi tr1,lc thao). Khi ta.ng khoi lu:qng rulo se lam tang dl1bng kinh tr~e va pha.i tang dai diE!u chinh toe d¢ d(lng cd truyE!n d(lng toi 5 : 1. Dieu nay khong the thljC hi$n du:qc ehi bang phU:dng phap thay d6i tn thOng rna phAi ket hqp voi hl;l di(ln ap phan ung tUdng ung yoi tAng dong phan ung.
Xet qua trinh quan. Chl'l" d6 ean d6i hOi sue eAng bang thep va toe dQ can kh6ng d6i. Do v~y, trong qua trinh can can giu cong suat kh6ng doi
Luc dAu, thea sl!' ta.ng dutlng kinh trl.;lc quan, ,toc d~ quAn phai giam nha tllng
tu thong v6"i quy lu~t Ia :
(8-45)
trong do : ¢dm ~ tit thong d~nh mdc cua dt)ng eo ;
¢, Dct> - du'ang kinh· rulo ung v6"i toc dt) co ban eua dong co, tit t~ong d¢ng co va duang kfnh ruia a thai ditim qulin nao do.
Khi tit thOng d.ii d~t dinh mde ihl toe d<) d¢ng co giam nha di~n ap phan ling, sao eho E E'm ~ hay: I I'm = '" <' 120 U Dch Udm = D D Dch j JlI/f,y! elii'll d,liA tJ tl/Mg I'",;'g % dip'),' cI,,;!It Vii
(8-46)
(8-47)
Hlnh 8-4 7 bi~u
tpi quan M cua E,
I, rp, n cua dQng co
truc quan thea
dub'ng kfnh ruia (0).
"%- 100
E
D6i voi qua
trinh thao thi ngli'oc
i~i. DAi dieu ehinh
toc do rOng eua d(ing
'Co tr~c thao duqc
thl!c hi~n qua dH~u chinh 2 vlmg "?-a hie dau tllng toe dO bang
di~n ap phAn ling, sau bang giam tit
thong. (adsbygoogle = window.adsbygoogle || []).push({});
Di,i.c tinh thay doi eua eac d~i luc;Jng
'" '"' 80 I '"' 80 I E 6670 n .0 zo Dmm o .-+---+----~,--~,-~~_ 0.6 ~8 lO 1-2 1,10 1,6 '-8 2,0 2,1
ffi,,11 8-·17. D~c linh thilY dlii elm c':'c dll! II.Nng <:<J bim then d\Jdng kinh mil'> In"C quan.
eo ban thea d uang
kinh ruM tr~e thao eho tren hlnh 8-48.
MQt viln dE! nita eAn luu y doi v6"i truyen dOng tr1,lc thaa va tr1,le qulin Iii khi may cim tllng toc d(i Otie md' may) va giAm toc (luc dung mAy) hay khi thay doi toe dt) cAn thi trang ml,l-eh ph an ung dOng eCJ xuAt hi~n cae thanh phan d¢ng cua dong di~n. Dong d()ng nAy ph~ thu(ie mue d<) gia toc, giam toc va dutlng kinh eua rul6 khi toe d¢ thay d6i.
Hinh 8-49, a eha quan h~ ph1,l thu¢e giua dong di)ng eua dOng cO truyen dong trl.;lc thao thea dubng kfnh rul6. Hlnh 8-49, b eho quan M ph1,l thuQc giua dong dc)ng cua dQng cCJ truyen d9ng tr1,le quiln thea dutlng kfnh rui6.
120
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Hinh 8-411. Di!L linh 11m}' LlGi ell;, uk rJi;li hldng CO him then
dllllng kinh I1Jlo true thin:'.
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