'. Phuong phap dnh ch!;m cOng Built d¢ng CO truy~n d¢ng thang may til!n hanh theo cac bulic sau dAy : 1. nnh IIjC kea d~t len puli cap kea bu6ng thang a tAng dulii dmg va cac IAn dung ti@'p thea : Trang do : kl - s6 llin dung cua bu6ng thang. 6.G 1 - thay d6i (giam) kh6i h1Qng tM sau m6i hin dung. g - gia t6c tr(;mg truong, [m/s2]. 2. Tlnh m6men tuong ung vai lljc kea. M F.R i.I[ , [Nm] nl!u F > 0 va : F.R . M ~ -,-12 , [Nm], n@'uF<O. Trang dci R - ban kfnh cua puli, [m]. i - ty 96 truy~n cua cd ~u. '1 - hi~u sucH cua co cAu. (3-5) (3-6) 3. Tfnh t6ng thbi gian hanh trinh nAng va h~ cua bu6ng thang baa g6m : thai gian bu6ng thang di chuyl!n vai t6c dQ 6n dinh, thbi gian rna may va hlim may va t6ng thai gian ron l~i (thai gian dong rna cua bu6ng thang, thbi gian ra vao buang thang cua hanh khach) thea bang 3-1. 4. Dy-a tr~n k@'t qua cua cac buac tlnb tmin tr~n, tinh mO men dAng trj va tinh chon cOng sullt de)ng cd. 5. XAy dljng bi~u do ph1,l ali chlnh xae cua de)ng cd truyl'!n. de)ng co tlnh den cae qua trinh qua de) va ti@'n hanh ki@'m nghi~m cOng sullt dQng cd dli ch<;>n thea di~u ki~n phat nong, qua till. §3.4. ANH HuUNG ellA Toe DQ, GIA Toe VA DQ D~T (DAO HAM B~e NHAT ellA GIA TOC) DOl veil He TRUYEN oQNG THANG MAy M9t trang nhung y~u cAu Cd ban d6i vOi M truy~n d¢ng thang may la ph!ll dam baa cha bu6ng thang chuyEfn d¢ng ~m. Bu6ng thang chuyEfn dOng Elm hay khOng, ph\! thu¢C vao gia t6c khi md may va khi hlim may. Cac tham 56 chlnh d~c t:rung cha ch~ dO lam vi~c cua thang may Ia : t6c d¢ di chuyEfn v[m/s], gia t6c a[m/s 2 ] va de) d~t p[m/s 3 ). T6c de) di chuygn cua bu6ng thang quy~t dinh nling Built cua thang may, cd y nghta quan tI'Qng, nh:H la d6i vai cac nha cao bing. D6i v6"i cac nha ch9c trbi, t6i uu nMit la dung thang may caa t6c (v = 3,5m/s), giam thbi gian qua de) va Wc d¢ di chuygn trung binh cua bu6ng thang d{lt gAn bAng t6c d() dtnh muc. Nhung vi~c tling t6e de) l{li dAn d~n tling gia thlinh eua thang may. Neu tang 32 '. t6c d¢ cua thang may v = 0,75m/s Hln v = 3,5m/s, gia thanh tllng Illn 4 + 5 ll'in. Bai v1).y, tuy thea d¢ caa cua nha rna chQn thang may co Mc d¢ phil hc;Jp viii t6c d¢ t6i uu. T6c d¢ di chuy4!n trung blnh cua thang may cd th4! tAng bAng clch giAm thOi gian rna may va ham may, cd nghla IA tAng gia t6c. Nhung khi gia t6c IlIn sll gAy ra cAm giac khd chju cha hAnh khach (nhu chdng m~t, SQ hAi, nghfilt tho v.v ). Boi v$.y, gia t6c t6i uu la a :!iO 2m/s2. Gia t6c t6i 11u dAm bAa na.ng suAt caa, khOng gAy ra cam giac kh6 ch~u cha hanh khach, d11QC d11a ra trong bAng 3-2. Tham s6 Tt'lc d¢ thang may (m/s) Gia t6c cl,1c d~ (m/s 2 ) Gia Me dnh toan kung binh (m/s 2 ) I '-' ,0 !-_I- 'I I , I , Xaay chi~u 0,5 0,75 1 1 0,5 0,5 s H~ tTUy~n d¢ng 1 1,5 0,8 M¢t chi~u 1,5 1,5 1 p r- , I 2,5 2 1 Bang 3-2 l' n , I 3,5 2 1,5 Q~I~~~ ______ ~~~~=+~t_ J. ~Bf)i)l ·i. , , L.,J P Hloh 3-4. Cae dlldng cong bit!u dil'n sl,l ph1,l tln.tOe ella quAng duong S, Ide d¢ v, gia 16e a va dO del P thea thOi gian. 33 M~t dl.li hrc;mg nua quyl'lt d~nh sl,t di chuy€n €lm cua bu6ng thang la t6c dQ tAng cua gia Mc khi mc'.! may va t6c d9 giam cua gia t6c khi ha.m may. Noi mtit eAch kM.c, do Iii da d 2 v d¢ ~t (~l.lo ham b~c nhc'(t cua gia tOe f = dt hoi;1c ~ h8rn. ~ hai ella. t.6c dti f = dt 2 ). ,Khi gia t6c a ~ 2m/s2 thi d¢ d~t kht"lng dUQc qua 20m/s 3 . Bh~u d6 lam vi~c t6i uu cUa thang may USc d9 trung binh va t6c dO cao bi€u di€n tr€ln hlnh 3-4. Bieu d6 nay co th~ chia ra lam 5 giai dOl.ln thea dnh chllt thay d6i toc dti cua buang thang : ma may, che dti On dinh, M.m xu6ng t6c d() thllp, bu6ng thang den tAng va ham dung. Bi~u d6 t6i uu hlnh 3-4 se dl;it dUQc n~u dung M truy~n d()ng mtit chi~u (F-D). Neu dung M truyen d()ng xoay chieu vlii d(lng co kht"lng d6ng b(l hai cap t6c dQ, bi~u d6 chi dl.lt gan giOng bi{!u d6 t6i uu. Doi voi thang may chl;iy ch~m, bi~u d6 chi c6 ba giai do!pl : mo may, chI'! dQ 6n dmh va ham dung. §3.5. DlrnG CHINH xAc BUONG THANG Bu6ng thang cUa thang may cAn phai dting chinh xac so voi m~t bang cua Uing cAn dung sau khi iln nut dung. Neu buang thang dung khong chinh xac se gay ra cac hi~n tUQng sau : - D6i v6i thang may cha kMch, lam cho hanh khAch ra, vao kho khAn, tAng- thai gian re, vilo cua hanh khach, dAn d~n giam nAng suilt. - D6i v{Ji thang may chb hang, gAy kho khAn trong vi~ xep va Mc da hang. Trang mtit s6 trubng hQP c6 th~ kht"lng tht,!c hi~n dUQc vi~ x~ vA Mc da hang. D~ kh~c phl,lc h(,-u qua do, co th€ c'(n nhAp nut ba:m d~ df).t dUQc dti chinh xac khi dung, nhung se dAn Mn cae vc'(n de kh6ng mong mu6n sau - Hong thi(~"t bi di~u khi~n - GAy t6n th!t nling lUQng - GAy h9ng hOc clk thi~t hi Cd khi - TAng thbi gian tu luc ham d~n dung. D~ dung chinh xlie bu6ng thang, din dnh den m(jt ntra hi/[!u 56 cua hai quang duang truQt khi phanh buang thang dc'(y Uti va phanh bu6ng thang kht"lng tAi thea cung mQt huang di chuy~n. Cac yeu to anh huang d~n dung chinh xac bu6ng thang bao gam : momen cua co cllu phanh, mt"lmen quan dnh cua buang thang, t6c d¢ khi b~t dAu ham va mOt s6 yeu to phl,l khac. Qua trlnh ham bu6ng thang xity ra nhu sau : khi bu6ng thang di dlin gan san tang, dIng tAc chuy€n d6i tang dip l~nh Mn h¢ th6ng dieu khi~n d(lng cd d~ dung buang 34 3_T009T_ -" '. thang. Trang quAng thbi ,gian 6.t (thbi man tac dQng cua thi~t bi di~u khi~n), bu6ng thang di dUQc quAng dubng IA S' = voAt , [m] (3-7) Trang d6 : v 0 - T6c dQ hic bAt dllu ha.m, [m/s]. Khi co c!1'u phanh mc dQng IA qua trlnh hAm bu6ng thang. Trong thbi gian nAy, bu6ng thang di dUQc m¢t quang duong S". mv' S" = 0, [m] 2(Fph ± FJ (3-8) Trang do : m - kh6i IUQng cAc phl1n chuygn dQng cua bu6ng thang, [kg] F ph - h,1c phanh, [Nl Fe - h,1c can dnh, [N] Dau (+) ho~c tru (-) trong bieu thuc (3-8) phl:l thuQc va~ chh~u tac dvng clla h,tc Fe: Khi bu6ng thang di l@n (+) va khi bu6ng thang di xu6ng (-). S" cung cd the vi~t duO'i df).ng sau : S" = (3-9) Trang do : J - mOmen quan dnh M quy d6i v~ chuy~n d¢ng Clla bu6ng thang, [kgm2] MPh - momen rna sat, [N] Me - mOmen can tlnh, [N] Wo - Mc dQ quay cua d¢ng co Iuc bAt dl1u phanh, [rad/s] D - dubng klnh puli keo cap, [m] - ti os6 truy~n. Quling dubng bu6ng thang di dUQc tit khi cOng tAc chuygn d6i tl1ng cho l~nh dung dl!n khi bu6ng thang dung tf).,i sAn tllng IA : S = S' + S" = Vo At + 2iCMph ± MJ (3-10) COng tAc chuyfn d6i tllng dQ.t each sAn tbg m(it khoAng cach nAo dd lAm sao cho bu6ng thang nAm if gilla hi~u hal. quAng dU'bng truo:t khi phanh d4y tAi vA khOng taL Sai s6 16n nMt (d(i di:lng khOng .chinh xac IOn nhllt) IA s - S' , I "S = 2 (3-11) Trong d6 : Sl - q uAng dubng truc;lt riM nhllt cua bu6ng thang khi phanh S2 - quAng dubng truc;lt Ibn nh4t cua hu6ng thang khi phanh (hlnh 3-5), Bang 3 - 3 dUB ra cac tham 86 cua cac M truy~n d(ing voi d¢ khOng chinh xac khi dung As. 35 Bang 3 - 3 Ph/ilm T6c dO Gia D¢ khOng H~ truyen dOng di~n vi di~u di . t6e chinh xBe khi chlnh chuy~n (m/s2) dttng (mm) Me dQ [m/s] DOng co KDB 1"0 to 16ng soc 1 ctlp t6c dtj 1 , 1 0,8 1,5 ± 120 + 150 DOng 00 KDB rO to 16ng soc hai cllp tile dO 1 , 4 0,5 1,5 ± 10 + 15 DOng 00 KDB re, to 16ng s6c hai cllp tile dl) 1 , 4 1 1,5 ± 25 + 35 H~ may phat - dl)ng co (F - D) 1 , 30 2,0 2,0 ± 10 + 15 H(! may phat - d¢ng 00 cO khuyl1ch d~ trung gian. 1 , 100 2,5 2 ± 5 + 10 '. - r-r Mticdat cam bien dung ~ I-linh 3-5. Dung chinh xflc w6ng thang. 36 '. §3.6. cAe H~ TRUYEN DONG DI~N DUNG TRONG THANG MAy VA MAy NANG Khi thi~t k~ M trang hi di(m - di~n tli: cho thang may, vi~c 11,18. ch9n mOt M truY~fI d(>ng, chQn lo(ii dOng co phAi d1,1a tr~n cae y~u diu sao - DC) chfnh xac khi dung - Teie dO di chuy~n bu6ng thang - Gia t6c IOn nhl1t cho phep - Ph~m vi di~u chinh t6c de H~ truy~n dOng dil)!n xoay chi~u dung d¢ng co khOng dOng bl) rotor lOng soc va rotor day que'in du'c;1c dung kha. pM bi~n trong trang hi di~n - dil~n to thang may va may nAng. H~ truy~n d(>ng dOng co !thong d6ng bl) rotor 16ng soc thubng dung cho thang may cho hang t6c dO ch$rn. H~ truy~n dOng d/)ng co khOng d6ng bl) rotor dAy quan thuang dung cho cae may nAng cO trQng tM lCm (ct.')ng sulIt d/)ng cO truy~n dOng tdi 200kW) nham hl;ln ch€ dbng khai d¢ng d~ kh6ng 111m anh huang d€n ngu6n di~n cung c-a:p. H~ truy~n d¢ng xaay chi~u dung d/)ng co kh6ng d6ng ~ nhi~u dIp t6c d¢ thubng dung cho cae thang may ebb khach t6c dl) trung blnh. H~ truy~n dl)ng mQt chi~u may phat - d(>ng ~o cO khu~h d~i trung gian thubng dung cho cae thang may cao too. H~ nlly dam baa bi~u d6 chuy~n dC)ng h~p Iy, n§.ng cao d¢ chtnh xac khi dung t6"i ± (5 + 10) mm. Nhu:~c di~m cua· hi:! nay la cOng sua:t d~t Ion gap(3 + 4)ll1n so v6i M xoay. chi~u, phuc tli\P trong v~n hllnh va. stia chua. Nhung nAm ga:n day, do s~ phat tri~n cua kg thu~t di~n tu ct"mg sutlt I6"n, cac M truy~n d(>ng ml)t chi~u dung bl) bien d6i dnh dll du~c ap dl,lng kha rC)ng rAi trong cac thang may cao tdc voi tdc d¢ t6i 5 m/s. 1. H~ tMng 1\1 d(ing kMng eh~ thang mily t6e dQ trung binh He truy~n d¢ng di~n dung cho thang may too d¢ trong blnh thu:bng la M truy~n dC)ng xoay chi~u vl:li dl)ng co kh6ng ddng b(> 2 dip too de. H~ nay dam baa dung chinh xlic cao, th~c hi~n MD.g eAch chuy@'n too d~ cua dOng CCI xu6ng t.6c d(> tha:p (v 0 = 2,5 rn!s) truoc kbi bu6ng thang sAp den san tling. Hi) nay thubng dung ebo cac thang may chlJ kM.ch trong cAc nha cao bing (7 + 10) U.ng) voi t6c dl) di chuy~n cua bOOng thang du6i 1 m/s. ScJ d6 nguyAn Ii di~n eua thang may dUQc gil:li thi~u trAn hlnh 3 - 6. Ca:p ngu6n cung clIp cho h~ bhng cl1u dao CD vll apt6mat Ap. CuC)n d§.y stator cua dC)ng cO dUQc niH vi'io ngu6n clip qua cae tiirp di~m cua cOng tAc to nAng N ho~c c6ngt~ctd h~ H va Cac tiep di~m cua c6ngtactcJ t6c d-Q cao C ho~c c6ngtactd tdc d(> tMp T. Ngu6n ca:p cho m~ch di~u khi~n 11Iy tu hai pha q~ hai· ctiu chi 1 CC. Cac cua tAng dl1~C trang b~ khda li~n d¢ng vl:li cae Mm cu6i lCT ; SCT. Then cai ngang cua li~n d(>ng vOi cAc hAm cu6i lPK + 5PK. Vi~c dong - mlJ ctia tling s~ tac d¢ng Mn kh6a vll then cM cua ting lam ebo nam chAm NC t tac dl)ng. Khi cAt ngu6n nam cha.m NC 1 lu.c 37 1[[ '. 38 I := YI 8A R 220/HI' ~ !!r ++ fD HilT (/IT J{IlT HilT f(IlT tiC ( C U[ _ DI ;:: D2 ~ DJ ~D+ _ DS ~ Dr; 1 NOI fti[ RTf /IN /IT) /IT,? !ITt fn _ 1PK J{[ - ;v !iT 46T JOT J6T lOT 1" IUT 16T T I!Tr N , , ~;v~. _-, ~~tI~ __ ~~==~;===~ ______ ~T ( lIlob 3-6. Sd do nguyen Ii ditn 'ella lhang roAy. 1[[ '. bu6ng thang den san Hh;lg, lam quay then cai, then cAi tac dOng ll!n m¢t trang cac ham cu6i PK va rna khoa cua tcing. De dung bu6ng thang tl;li moi san U.ng, trong sd d6 dung ham cu6i HC di,it trong buang thang. Tac d~ng l~n tiep diem HC hol)c bttng nam cha.m dung theo tang NC 2 ha/)c bttng clin dong - rna cua bing. Cong Mc chuyen ddi tAng ICDT + 5CDT co ba vj tri h'i cam bign dung bu6ng thang va xac djnh vi trf th~c cua bu6ng thang so voi cac tling. Di~u khien ha~t dOng cua thang may dUQc th1!C hi(!n tu' hai vj trl : t~i 'cva tAng bang nut Mm gQi tang IGT + 5GT va trang bu6ng thang bang cac nut bAm dgn tAng lOT + 5DT. Khoi dOng cho thang may lam vi(!c chi khi : ID kin, ICT + 5CT kin (cac cua tang da dong), 2D, CT kIn, FBH Oil!n d(>ng v6i phanh bao hiem) kin, cua bu6ng thang dong, CBT kin va 3D kIn. HAm cu6i IHC va 2HC lien d(>ng vaj san bu6ng thang. Ngu trang bu6ng thang co ngl.1bi, tiep diem cUa chung rna ra. IHC da:u song song vai CBT cho nl!n du IHC hO nhung m!;lch vAn n6i li~n qua CBT, cbn 2HC mo ra lof;li tru kha nAng di~u khien thang mdy bttng nut ba:m g9i thg GT. Trong so d6 co 5 den baa D} + Ds Ia.p a tr~n mc5i eua tang va 1 den chieu sang buang thang D 6 , Khi co ngl.1bi trong bu6ng, tiep diem 2HC rna ra, cuOn day role trung gian mAt di(!n, tiep di~m thubng kin RTr dong I/ili lam cho ID + 6D sang len bao cha biet thang dang ttb~n ~ va chigu sang cho bu6ng thang. Sd d6 nguyl!n Iy trl!n Mnh 3 - 6 130 so d6 cua thang Hip di,it trang nha nam t.1ng va cha tru'bng hQp bu6ng thang dang nam a tllng ml)t. Xet nguy~n Ii lam vi(!e cua so d6 khi can len tang 4. Hanh kha.ch di vao bu6ng thang, dong cua tllng va cua bu6ng thang. Do tr9ng h1Qng cua hanh khach, 2 tiep diem thubng. dong IHC va 2 HC rna ra, An nut Mm den tang 4 DT, rale tang RT4 co di(!n. Cac tiep diem cua RT4 dong ll;li dip ngu6n cha cuOn dAy cua c6ng tiic ta t6c d¢ caa C. Cdc tiep diem cua congtacta t6c dO caa dong ll;li cap ngu6n cha cl1u chinh luu CL la ngu6n I chi~u ca:p cha hai nam chAm NC t va NC z ' Nam chAm NC l Be dong tigp diem I PK, cuOn dAy cOngtactd N co _di(!n. Cu(>n da.y stator cua d¢ng ca dllQC ca:p ngu6n qua cac tiep diem C va N, bu6ng thang di l~n. Nam chAm NC 2 se kea can dl)i lam cha hAm cu6i H~ rna ra. Khi nha nut Mm 4 DT, cuQn dAy cUa cOngtocto N dUQc duy trl ngu6n ci!:p qua hai tiep dit1m T (thllbng kIn) vA. N (da dong l~i). D6ng thbi cuOn dAy cua rale 4RT vAn dUQc tief:! tyc duy' trl ngu6n ctlp qua c6ng tdc chuy~n d6i Uing 4CDT va cac tigp diem IPK + 5PK. Khi bu6ng thang gtln den tl1ng 4, bu6ng thang tAc dl)ng vAa cOng tAc chuyen ddi tang 4 CDT, lam cho rale tling RT4 va cOngtActd t6c dO caa ma:t di(!n. CuOn dAy cOngtdcta t6c dO thtlp T cd dililn qua tiep diem thllbng ho N (dA dong kin) va tiep diem thllb'ng kin C. Cul)n dAy stator cua dl)ng co dllQC da:u vaa ngu6n ctlp qua cac tiep diem N vA T. Bu6ng thang tiep t\lC di ll!n vai t6c d¢ tMp hdn. D6ng thbi cAt ngu6n ctlp cha ctlu chlnh luu CL, hai nam chAm NC l vA NC 2 ma:t di~n. NC 2 mtlt di(!n lam cha hAm cu6i HC kIn l/ili, vAn duy tri ngu6n cd'p cha coOn dAy cOngtdcta N. Khi buang thang den ngang vai san tcing 4, clln dong rna cu:a d(it a cu:a bing se tac dOng lam 39 '. hAm cu6i HC h~ ra. CuQn dAy cOngtActo N mAt di~n, dQng cO truy~n d¢ng dung l~i vA phanh hAm di~n tu NCH s@J hAm dung hu6ng thang. H~ th6ng t\1 dQng kh6ng ch~ thang mliy hoAn toim t1.1ong t\1 nh1.1 t~n khi di(!u khi~n bAng cAc nut Mm gQi bing IGT + 5GT. Di(!u khi~n thang may lilm vi~c bAng cac nut Mm gQi Mng chI th\1c hi~n khi 2HC kin. 2. H~ thOng tll dOng khong eht thang m6y eao tOe D~ truy(!n dQng thang mliy cd t6c dQ di chuy(!n bu6ng thang v ~ 3 rn/s, th1.1bng dung M truy(!n d¢ng -mQt chi(!u. Bu6ng thang d1.1Qc treo Mn puli keo cap n6i tI1,1c tiep v{ji tn,IC dQng co truy(!n dQng khOng qua hQp giAm t6c. Trong m~ch di(!u khien thang mliy cao t6c, cOng tlic chuy~n d6i bing co tay ~t CO" khi d1.1QC thay the bAng cOng tAc chuy~n d6i tling phi ti~p di~m. Vi vt'H t6c dQ di chuy~n bu6ng thang lan, cOng tAc chuy~n d6i bing co kh{ lilm vi~c khOng tin c$.y, gAy ra tieng 6n Um. C6ng t~c chuy~n d6i t4ng phi ti~p di~m th1.1bng dung Iil b¢ cam bi~n vi trl kit~u cam ung va b¢ cam bien vi trf dung te bAo quang di~n. T~n hlnh 3-7a giOi thi~u cAu t~o vil d~c tuyen clla cOng tAc chuy~n d6i bing dung bet cam bien vi trf kit~u cAm dng. Ctlu t~o cua no bao g6m : m~ch tu M 2, cu¢n dAy 3. Khi m(lCh tu M, do di~n khang cua cu¢n dAy be, dong xoay chil!u qua cuQn dAy kha Ian. Khi thanh sAt d¢ng 1 lilm kin m~ch til:, tu thOng sinh ra trong m~ch tu tAng, lilm tAng di~n cam L cua cuQn dAy vil dong di qua cuQn dAy sll giam xu6ng. S\1 ph\1 thu¢c diQn cam cu¢n dAy L vilo vi trf thanh dQng 1 d1.1Qc bieu dii'!in tr~n hlnh 3-7b. Neu dtlu -n6i tiep vtJi cuQn dAy cua b¢ cAm bi~n mQt role ta se d1.1Qc mOt ph~n to: phi ti~p d.i~m d~ dung trong M th6ng di~u khi~n. Tuy .thuQc van m\1c dich su d\1ng, co th~ dung no lilm cOng tAc chuy~n d6i tling, cam bien de th\1C hi~n dung chinh xac bu6ng thang ho$,c cAm bi~n d~ chi thi vi trf bu6ng thang v.v S I I I , , • D Q,S 1 f oj 40 L , ~ 2 J u mDh 3-7. C;\m biln VI lri ki.!u dm ung. /.1- Cdu telO b- S41 phil tlauDe L = f (1). 5 1,0 0) "" 2201" feB RTr C8 I Ilf I I I c c 1IJ 114 b) Bloh 3- 8. So d~ nguyen 19 cUa dm bi!!"n cam ling. So' d6 nguy@n ly cua cam bi~n cAm dng t~n hlnb 3-8. C*~ __ ~~~_~_~_~. ___ _ ung CB. D~ nAng caa dQ tin ~y, song song vlti cUQn dAy cua bl) cam bi~n co da:u tMm mOt t1,l C, Trj 86 di~n dung ella tl,l di~n dll~C ch9D BaD cho khi thanb sAt d¢ng 1 che I. kIn mt;lch tit sll U;lO dUQc dbng C¢ng huang. Khi m~ch tu ella cam bi@'n het, dong di qua , cuOn dAy cua role RTr du Um lAm cho no tac d/)ng. Khi ml;lch til: kin, dbng dili\n di qua cu¢n dAy giam xu6ng glln b~ng khOng, role khOng tac dQng. ThOng thub'ng b(l cam bii!n CB dl1QC lAp (} thanh gii!ng thang, thanb sAt dQng lAp (J bu6ng thang. T~n Mnh 3 9a gitJi thi~u mf(lch l~c ciR M truy~n dQng m/)t chi~u CBQ bii!n ddi thyristor - d/)ng eCl) cho thang mAy caa t6c vCii v = 2 m/e va trvng tlli Q = 1000 kG. Phttn !lng cua d¢ng CO' truy~n d¢ng dllQC ca:p ngu6n tu b¢ bi@'n d6i dnh dung thyristor t~o hOi 2 m~ch c.du chinh hiu ba pha ITI .;. 6TI (b¢ thu~n) va IT2 +- 6T2 (b¢ ngt1Qc): Hai hI? nay df1u song song ngt1Qc vbi nhau. BAa vi) quA ap cho m6i thyristor dUng m~ch R-C. Bao vi) ngAn m~h ba.ng du chI tAc dl)ng nhanh CC. CUQn khAng lCK va 2CK dung dA' h~n ch~ dbng dii)n cAn b~ng. M~ch di~u khi(!'n bl? bi@'n ddi dao chi~u dung thyristor biA'u dilj:n tren hinh 3-9b. Di~u khiA'n hai du chinh lUu IBTh va 2BTh bl\ng hai khdi di~u khi(!'n KDKN va KDKH. Trong m6i kh6i di~u khi~n bao gdm cac khAu : khau d6ng pha, khau tl,lO di(\n ap rAng cUa, kh:1u so'sAnh va tl;\O 'xung va khau khu@'eh d~i xung. Nguy~n If lam vii)c eua Sd dd khdng chi! thang may cao t6c nhU sau : Dien ap dj)t duge Illy ra tU'd4u ra cua khAu h~n ch@' gia tde HCGT, dl) Ibn vA e'l,te dnh cua dii)n ap dj)t do khAu di~u hanh DH quy@'t d!nh. Di(\n Ap ra ella khAu hl;\n eh@' gia t6c HCGT tAng dlln theo ham tuy@'n tlnh b$C' nh4t khi thay d6i tin hi(\u dliu va~. Di~u ehlnh tde dl) dl)ng cCl truylln dl)ng bAng b¢ di~u chlnh tde dQ Rill' Tin hii)u dliu van cua b¢ di~u ehinh tde dl) Rill la t6ng dl;\i 86 hai tin hi~u : tin hi~u chu d~o (dii)n ap ra (Jua khAu HCGT) va dn hi~u phan h6i Am t6c d¢ tl l~ v{Ji tde dl) .quay cua dQng eo (di(\n Ap ra cUa khAu Kill)' KhAu Rill dung bl) khu&:h dIP m¢t ehi~u (ham d 1(\ P). Tln hj~u ra cua Rill Ia tIn hi~u d4u vao RJN (khi thang mAy di l~n) vA RJH (khi thang mAy di xu6ng). CA hai khAu RJN va. RJH dung bQ khu&h dl;\i m¢t chi~u (ham ti 1(\, tich phAn Pl). Ngoai ra, tin hi~u phAn hoi Am dbng h1y tu dliu ra cua khAu I K J (ti 1(\ v{Ji 41 . : F.R . M ~ -, -1 2 , [Nm], n@'uF<O. Trang dci R - ban kfnh cua puli, [m]. i - ty 96 truy~n cua cd ~u. '1 - hi~u sucH cua co cAu. ( 3-5 ) ( 3-6 ) 3. Tfnh t6ng. ( 3-8 ) Trang do : m - kh6i IUQng cAc phl1n chuygn dQng cua bu6ng thang, [kg] F ph - h,1c phanh, [Nl Fe - h,1c can dnh, [N] Dau (+) ho~c tru (-) trong bieu thuc ( 3-8 ). IOn nhllt) IA s - S' , I "S = 2 ( 3-1 1) Trong d6 : Sl - q uAng dubng truc;lt riM nhllt cua bu6ng thang khi phanh S2 - quAng dubng truc;lt Ibn nh4t cua hu6ng thang