d. T?O thai gian tri hoan de cat m?ch.
Gidi thi�u:
Bai 4
r A � ,:J
KHI CU DIEN DIEU KHIEN . .
A � _,:J
DIEN DIEU KHIEN
Hi$n nay nganh cong nghi$p d Vi$t nam dang phat trien rat nhanh, nhu cau stJ d1,mg cac lm;ii khf cv di$n dieu khien ngay cang nhieu ve so I- gng va chung lo9i. Cac nha san xuat da khong ngCtng cai tien va nang cao chat I- gng, chung lo9i nham dap Ctng nhG'ng yeu cau cua thj tr-ang. Do V?Y tU' vi$c t1m hieu ve ly thuyet cOng nh- thl/c hanh t1m hieu ket cau, tfnh toan ch9n II/a den vi$c sU' d1:1ng, V?n hanh nh6m khf cv nay la can thiet nham dieu khien tot nhat cho m9ch di$n va h$ thong di$n ..
N9i dung bai h9c nay nham trang bi cho h9c vien nhG'ng kien thU'c co ban ve cau t9o, nguyen ly ho?t d9ng cua nh6m khf cv di$n dieu khien th- ang d- gc sU' d1:1ng trong m9ng h? the, trung the va trong cac doanh nghi$p cong nghi$p, trang b! cho h9c vien ve ky nang II/a ch9n d- gc cac khf cv di$n de sU' d1:1ng cho tang tr-ang hgp cv the theo tieu chuan Vi$t Nam, biet each kiem tra, phat hi$n va sU'a chG'a 16i cac khf cv di$n tren theo cac thong so ky thu?t cua nha che t9o.
M1:1c tieu thlfc hi�n: A � ,:/
DIEN DIEU KHIEN
Hc;JC xong bai h9c nay, h9c Vian c6 ncJng /{/c:
• Tr1nh bay cau t9o va nguyen ly ho?t d9ng cua cac lo9i khf cv di$n dieu khien c6 trong x- bng tr-ang theo n9i dung bai da h9c.
• SU' d1:1ng thanh th9o cac lo9i khf cv di$n dieu khien c6 trong x- bng tr-ang, dam bao an toan cho ng-ai va cac thiet bi theo TCVN.
• Tfnh ch9n cac lo?i khf cv di$n dieu khien c6 trong x- bng tr-ang, d9t tieu chuan theo yeu cau lap dc)t.
• Thao lap cac lo9i khf cv di$n dieu khien c6 trong x- bng tr-ang, dam bao an toan cho ng-ai va cac thiet bi theo TCVN.
• Phan doan h- hong va sU'a chG'a d- gc h- hong cac khf cv di$n dieu khien c6 trong x- bng tr-ang, dam bao an toan cho ng-ai va cac thiet bi d9t thong s6 ky thu?t.
N9i dung chinh:
., A � N
KHI CU DI:eN DIEU KHIEN A. CONT ACTOR A. CONT ACTOR
Contactor la m9t lo9i khf cl,J di$n dong cat h9 ap dung de khong che tl_1 d9ng va dieu khien tU' xa cac thiet bj di$n co di$n ap 500V va dong di$n 600A. v8i sl_1 ho tr<;1 cua nut dieu khien.
Hlnh 4. 1 . Hlnh dang ngoai cua Contactor
Contactor co 2 tr9ng thai: dong va cat, co s6 Ian dong cat I8n, tan s6 dong cat cao co the t8i 1500 Ian /gid.
Contactor co the chia thanh nhieu lo9i:
- Theo nguyen ly truyen d9ng co Contactor : di$n ta, khf ep, thuy IL_1c (thong d1,Jng la kieu di$n ta).
- Theo nguyen ly dong di$n co Contactor : m9t chieu, xoay chieu. Trong giao tr1nh nay, chu yeu tr1nh bay Contactor kieu di$n tU'.
4.1. Ca'u t�o Gorn cac b9 ph�n nh- h1nh (h1nh 4.2; 4.3; 4.4)
H1nh 4.2: Cau t9o ben ngoai Contactor.
Lo xo phan Ilic . ""-
Cu9n day
0 0
H1nh 4.3: M�t cat d9c cua Contactor.
Khoa dit$n - Trudng TCN KTCN Hung Vuong
Cac Clfc dau day cua cac tiep di�m ph1,1 th- ong d6ng
Cac Cl/C dau day cua cac tiep di�m ph1,1 th- ong md
Clfc dau day cua cac tiep di�m chfnh cua Contactor.
_.,,. Phan nap di d9ng
Phan co dinh
Vo nhlfa
M9ch tU' phan Ctng Lo xo phan h/c
H1nh 4.4: Cac b9 ph�n chfnh cua Contactor.
Cu9n day (cu9n hut)
M9ch tCt phan cam Vong ngan m9ch
Cac tiep diem chf nh
- M�ch tir: la cac 16i thep c6 h1nh d9ng El ho?c chll' UI. N6 gom nhll'ng la ton silic, c6 chieu day 0,35mm ho?c 0,5mm ghep 19i de tranh t6n hao dong di$n xoay. M9ch tu th- ang chia lam hai phan, m9t phan d- (Jc kl?P ch?t co dinh (phan tinh), phan con l?i la nap (phan d9ng) d- (Jc noi v6i h$ thong tiep diem qua h$ thong tay don.
- Cu9n day: cu9n day c6 di$n trb rat be so v6i di$n khang. Dong di$n trong cu9n day phy thu9c vao khe he1 khong khf gill'a nap va 16i thep co d!nh. V1 V?Y, khong d- (Jc phep cha di$n vao cu9n day khi nap mb. Cu9n day c6 the lam vi$c tin C?Y (hut phan Ctng) khi di$n ap cung cap cha n6 nam trong ph9m vi (85-1 00)% udm .
- H� thong tiep dilm: ► Theo kha nang dong tai:
* Tiep diem chfnh: chi c6 C1 Contactor chfnh, 1 00% la tiep diem th- ang mb, lam vi$c C1 m9ch d9ng h/c, v1 the dong di$n di qua rat 16n (1 0 + 2250)A.
* Tiep diem phy: c6 ca th- ang d6ng va th- c)ng mb, dong di$n di qua cac tiep diem nay nho chi tu 1A den khoang 1 0A, lam vi$c C1 m9ch dieu khien.
► Theo nhi$m v1;1 lam vi$c:
* Tiep diem th- ang d6ng va tiep diem th- ang mb: (xem phan Rdle).
- Cd cau truyen d9ng: phai c6 ket cau sao cha giam d- (Jc thai gian thao tac d6ng ngat tiep diem, nang cao h/c ep tiep diem va giam d-CJc tieng va d?P·
❖ Phan lo�i:
+ Theo nguyen ly truyen d9ng c6: Contactor kieu di$n tu, kieu hdi ep, kieu thuy h/c. Th- cJng g?p Contactor kieu di$n tu. Contactor kieu di$n tu c6 hai lo9i:
- Contactor chfnh: c6 3 tiep diem chfnh con 19i la tiep diem phy.
- Contactor ph1r Chi c6 tiep diem phl:J (kh6ng c6 tiep diem chfnh).
+ Theo d9ng dong di$n ta c6: Contactor di$n m9t chieu, Contactor di$n xoay chieu + Theo ket cau ta c6: Contactor dung a noi h9n che chieu cao (a bang di$n gam xe) va a noi h9n che chieu r9ng (buong tau di$n).
❖ Ky hi�u:
► Cu9n day:
A� A� A�
► Tiep dilm chinh:
Th- ong d- gc ky hi$u bai 1 ky so: Cac ky so d6 la: 1 - 2; 3 - 4; 5 - 6. i 3 5
� � �
2 4 6
Trong Contactor chfnh, 3 tiep diem dau tien ben tay trai lu6n lu6n la tiep diem chfnh, nhG'ng tiep diem con 19i la tiep diem phl:J.
► Tiep dilm ph\l:
Th- ong d- gc ky hi$u bai 2 ky so:
i 3 23 33 43