M¢t s6 lOn may can day dung truyfln d¢ng di~n xoay chillu vai d(>ng Cd khong dong b(> 3 pha rotor day quan, ctJng suat dl1ai 55kW, 380V, 1500 vgJph. May can cong suat nha co th~ dung d9ng Cd xoay chi~u rOto l6ng soc. D¢ng Cd noi vai h9P
t6c dO hing dai truyen hinh thang. Cac may can day to vll d!7lC bi~t to thltang su dl).ng d¢ng cd khtJng dong bl> 3 toc do rotor long SOC, cl5ng sUat tai 40kW, 750/1000.1500
vg/ph.
Yeu c~u chinh cho truyen dl>ng may can day la dam bAo wc d{'> chlnh djnh may nha (tOc dO bo) va chuyen em len toc d9 lam viflc.
Phan Illn cac may can day thljc hi~n dieu chinh toc dt> ba.ng di~n tro phI,! : ml>t cap 0 m~ch stator d¢ng cd rotor long soc, toi 5 c.!lp 0 m~ch rotor dl>ng Cd day quan. Tang toc dt> d¢ng cd thea nguyen tac thai gian. Dung nhanh nhi'! h1!.m ngl1Qc hay hAm d¢ng n1!.ng. Ctip kich ttl cho stator khi h1!.m d{'>ng nang III nha b¢ bien d6i thyristor,
Hinh 8-.55 cho sd do dieu khien truyen d¢ng may can dAy co trltdt 15/200 ;
22/200 (tu 56 ia s6 tang keo, miu s6 ia dl10ng klnh tang keo tinh theo mm). 2D Is dl>ng cd kh6ng dong bl> rotor 16ng !i\oc 0,6kW keo may bdm dfiu. Dl>ng Cd ID keo cac tang keo ct>ng su:it 17 kW. Bao vc cac dong Cd bang cac cau chi ICC, 2CC
=f~~==~~~======~==~====='::'-=-- va cac role nhi(!t IRN, 2RN.
= Cac di~n trd R d m~ch 2CC Ie.;; 2KN ". IK ~(R 3K BA 1RN 2RN 38'1'220 v ~ ~ stator dqng Cd ID dung de giam t6c d¢ d¢ng cd khi ch~y chinh may va h~n che dong md may.
Dau tien, an 1M de cong ta.c td 2K dong m!ilch d9ng Cd bdm dau.
De ch~y chlnh may, chllyen h9P toc d¢ d muc tha"p va an 2M de cong tac td IK dong mach d¢ng Cd
iD q~a di~n trd R. Sau
khi chf;l.y chlnh may, ehuy€fn h¢p t6e d¢ l€m s6
m"h Ii-55. So do TDD may can day dung cae <.lOng co khClng <.Icing h() cao va :in 3M. Rdle trung
rotor l(\og ~Oc.
166
gian Re co di~n se dong m~ch rdle thai gian va sau thai gian duy trl se dong
m~ch cong ta.c td gia toc 3K d~ ngan m/ilch di~n trd
R 0 m~ch stator d(lng
Cel ID.
, Dung may bang tllY n~a nut, D. Cac cong tac hanh trinh IHT, 2HT se dung may khi dut day can
va khi day qm"in ddy. Hinh 8-56 bie'u thj sd do truyen d¢ng may can day 10/250 va. 13/250 co truqt .voi dOng cd rotor day quiln. Ctmg suii,t d¢ng Cd chinh la. 45kW. Ho~t dt")ng cua Sd do tl1dng tl! nhu sd do hlnh 8-55. Tang toc dOng Cd ID thea nguyen t:ic thai gian nha rdle thi1i gian Rth co d(>ng Cd d@' Ian h1qt dong m~ch cac cong tac td gia tOe KI, K2, K3.