3.1 . Ca'u t�o
Cu9n day hut cua role dong di$n th- ang c6 tiet di$n day 16n ( chiu d-(Jc dong di$n 16n), so vong ft. V6i m9ch cong suat nho th- ang d-(Jc noi noi tiep trong m9-ch can bao v$.
Ooi v6i m9ch c6 dong lam vi$c 16n th- ang phai noi trong m9-ch thCt cap cua may bien dong.
H1nh 3.9 mo ta cau t9o co ban cua role dong di$n.
H1nh 3.9: Cau t�o co ban cua role dong diE;ln.
3.2. Nguyen ly lam vi�c:
Nguyen ly lam vi$c cua role dong di$n la phl:J thu9c vao c- ang d9 dong di$n di qua cuon day:
- Ooi v6i role dong di$n CI/C d9i: neu dong di$n I di qua cu9n day cua role nho hon hO?C bang dong di$n djnh mCtc cua cu9n day role. H$ thong tiep diem cua role khong thay d6i tr9ng thai. V1 m9t ly do nao d6 ma dong di$n I di qua cu9n day role 16n hon dong dinh
mCtc cua n6 th1 h$ thong tiep diem se thay d6i tr9ng thai.
- Ooi v6i role dong di$n CI/C tieu: ng-(Jc 19-i, neu dong di$n I di qua cu9n day cua role
16n hon ho?C bang dong di$n djnh mCtc cua cu9n day role. H$ thong tiep diem cua role khong thay d6i tr9ng thai. V1 m9t ly do nao d6 ma dong di$n I di qua cu9n day role nho hon dong djnh mCtc cua n6 th1 h$ thong tiep diem se thay d6i tr9-ng thai.
Tri so tac d9ng cua role th- ang d-(Jc ch1nh dinh thee yeu cau sll' d1:1ng trong m9t gi6i
h9n cho tr- 6c doi v6i moi cao. moi lo9i role Cl:J the.
3.3. Tf nh ch9n rd le dong di�n:
Role dong di$n th- ang g?p cac lo9i: dong di$n m9t chieu hay dong di$n xoay chieu, c6 dong di$n CI/C d9i hay dong di$n CI/C tieu.
- Role dong di$n CI/C d9-i th- ang d-(Jc dung trong m9-ch bao v$ qua dong, qua tai cho
h$ thong. C6 the dung trong m9i h$ thong cung cap di$n, trang bi di$n hay cac h$ thong tl/ d9ng.
- Role dong di$n CI/C tieu th- ang d-(Jc sl.l' dl:Jng trong cac h$ thong bao v$ chong lam
vi$c non tai, trong h$ thong cung cap di$n, trong ht;) thong ti/ d9ng dieu ch1nh toe d9 trong truyen d9ng di$n ...
Khi can ch9n role dong ta can cCt vao:
- Dong di$n djnh mCtc cua rdle: - Oi$n djnh mCtc cua rdle:
LJ<imr role= LJm;mg
- Can cCt vao mvc dfch sU' d1:1ng baa v$, dung de baa v$ qua tai hay non tai, dung trong m9ch di$n m9t chieu hay xoay chieu. Tuy vao tll'ng tr- dng h(Jp Cl:J the ma ta ch9n rdle c6 cac thong s6 thfch h<Jp.
3.4. Hu hong va c�c nguyen nhan gay bu hong:
Rdle dong di$n la m9t d9ng cua rdle di$n tu' nen trong qua tr1nh sll' dvng ta th- bng g?P cac h- hong gi6ng nh- rdle di$n tu' tCtc la th- bng h- hong tiep diem, h$ thong lo xo va cu9n day cua rdle va nguyen nhan gay ra nhU'ng h- hong tren th- bng la do bj ngan m9ch hO?C qua tai Ion phfa sau rdle.
3.5. Sita chua role dong di�n: ❖ Bi�n phap stta chua1: ❖ Bi�n phap stta chua1:
► Kiem tra each di$n cua cu9n day: each di$n giU'a cac vong day cua cu9n day, each di$n giU'a cac pha phai dung voi yeu cau cua nha san xuat qui djnh, llfa ch9n rdle phai dung cong suat, dong di$n, di$n ap va cac che d9 lam vi$c t- dng Ctng.
► Kiem tra va sll'a chU'a nan th�ng, ph�ng gia dB tiep diem, dieu ch1nh sao cha trung khop hoan toan cac tiep diem d9ng va tinh cua rdle.
► Kiem tra 19i lo xo cua tiep diem d9ng xem c6 bj meo, bien d9ng hay d?t 1$ch tam khoi ch6t giU'. Phai dieu ch1nh dung llfc ep tiep diem (c6 the dung llfc ke de kiem tra).
► hay the bang tiep diem moi khi kiem tra thay tiep diem bi qua mon ho?c bi ro chay hong n?ng.
► Kiem tra va lo9i trlf cac nguyen nhan ben ngoai gay h- hong cu9n day va quan 19i cu9n day theo mau ho?c tfnh toan 19i cu9n day dung cac thong s6 ky thu$t.