cau83 :khai niem ,phan loai
la mot kcd dien dung de dong cat thuong xuyen cac mach dien dong luc , tu xa bang tay hoac tu dong. viec dong cat cong tac to co the thuc hien bang nam cham dien thuy luc hay bang khi nen . thong thuong ta gap loai bang nam cham. cong tac to co 2 vi tri dong cat dc che tao voi so lan dong cat lon hon tan so dong cat co the len den 1500 lan /h
theo nguyen ly truyen dong nguoi ta chia thanh cac loai
cong tac to dong cat bang dien tu, dong cat bang khi nen, dong cat bang thuy luc
theo dang dong dien dong cat co cong tac to dien 1 chieu va xoay chieu
theo ket cau co cong tac to han che chieu rong va han che chieu cao
cau 84 cac tham so co ban
dien ap dinh muc Udm la dien ap cua mach dien tuong ung ma tiep diem chinh cua cong tac to phai dong cat. dien ap dm co cac cap 110v, 220v,440 vmot chieu va 127v,220v,380v,500v xoay chieu
dong dien dinh mua Idm la dong dien di qua tiep diem chinh cua cong tac to trong che do lam viec gian doan lauy dai , o che do do thoi gian dong cua cong tac to ko qua 8h
dien ap cuong day Ucdđm la dien ap dinh muc dat len cuon day khi tinh toan thiet ke can phai dam bao cong tac to lam viec on dinh trong dai tu 85-110%Ucdđm
so cuc:la so tiep diem chinh cua cong tac to
so cap tiep diem phu: la so cap tiep diem khong che mach dieu khien cua cong tac to
kha ngan cat va kha nang dong: la gtri dong dien cho phep di qua tiep diem tinh khi cat I(ng) hoac dong I(đg)
tuoi tho: la so lan dong cat ma sau so lan dong cat do ctt co the bi hu hong ko dung dc nua
tan so thao tac: la so lan dong cat cho phep cua ctt trong 1h
tinh on dinh dien dong: la kha nang cho phep dong ngan mach lon nhat di qua ma luc dien dong sinh ra ko lam tach roi tiep diem
tinh on dinh nhiet la kha nang cho phep dong ngan mach di qua trong khoang thoi gian cho phep ma cac tiep diem ko bi nong chay va bi han dinh
cau 85 cau tao mach vong dan dien
mach vong dan dien cua ctt do cac bo phan # nhau ve hinh dang kick thuoc hop thanh ,no bao gom thanh dan, day noi mem,dau noi,he thong tiuep diem,cuon day dong dien ,mach vong dan dien cua ctt: thanh dan dong va tinh dc lam bang dong,tiep diem co dang hinh ngón or bac cau.1 pha co 2 cho ngatva duoc che tao bang vat lieu dan dien tot ,chiu duoc mai mon va chiu duoc ho quang nhu kim loai gom :bac-niken-than chi. o trang thai ngat do mo cua tep diem phai co gia tri du lon de ngan khong cho ho quang chay tro lai ,dong thoi cung khong qua lon de giam kich thuoc cua nam cham dien .o trang thai dong de dam bao tiep xuc tot ,cac tiep diem cua cong tac to co he thong lo xo tiep diem tao luc ep can thioet len tiep diem
cau86:cau tao he thong dap ho quang
hthong dap ho quang cua ctt dam bao nhanh chong dap tat ho quang sinh ra trong qua trinh dong cat cua tiep diem
+thiet bi dap ho quang trong ctt diem 1 chieu :nguoi ta thuong dung cuon thoi tu tao ra tu truong tac dung len dong diem ho quang va day ho quang vao buông dap ho quang .cuon thoi tu thuong duoc mac noi tiep voi tiep diem khi dong dien cang lon luc dien dong sinh ra cang lon ,ho quang dc day sau vao buong dap ho quang .buong rap ho quang dc che tao tu nhung tam thep non tao thanh dan dap ho quang or kieu dap ho quang co khe ho hep
+thiet bi dap ho quang trong ctt dien xoay chieu :cac ctt dien xoay chieu thông duing trong cong nghiep thuong duoc che tao loai ket cau 1 pha co 2 cho ngat ,su dung tiep diem dang bac cau dat trong buong dap ho quang kieu dan dap hay trong khoang dap ho quang dac biet cung co the dc che tao duoi dang tiep diem chuyen dong quay ,co bo tri cuon thoi tu de tang cuong kha nang dap ho quang
cau87: cau tao nam cham dien
gom 2 phan :mach tu va cuon day.
mach tu nam cham dien 1 chieu dc lam bang thep khoi ,phan than mach tu noi co tiet dien tron .mach tu nam cham dien xoa chieu dc che tao tu cac la thep ki thuat dien day 0,35- 0,5 mm, ghep lai de tranh ton hao loi thep
mach tu chia lam 2 phan :phan co dinh (tinh) ,phan nap (dong)b dc noi voi tiep diem qua he thong tay don .
cuon day nan cham dien dc che tao tu day dong ,dc quan tren khung bang vat lieu cach dien sau do long vao mach tu
cau 88:nguyen ly hoat dong 1 chieu
hinh ve
trinh bay cau tao cua ctt dien 1 chieu :tiep diem tinh 1dc gan tren quai 2 dong thoi dc noi voi cuon thoi tu 3 ,dau kia cua cuon thoi tu dc noi voi dau ra 4 ,cach dien voi gia do dong thoi la mach tu 6 = tam cahc dien 5.tiep diem dong 7dc che tao dang tam ,dau cuoi co the quay xung quanh diem tua 8 dau ra9 dc noi voi tiep diem 7 nho day noi mem 10.luc ep len tiep diem sinh ra do lo xo tiep diem 12 de giam nong chay cho cac tiep diem chinh boi ho quang khi dong dien >50A .duoi tac dung cua cuon thoui tu ho quang nhanh chong chuyen dich ve phia quai 2 bat chat voi tiep diem tinh 1va chuyen ve sung bao ve cua tiep diem dong 11.sau khi cat dien phan dong tro ve vi tri nban dau nho lo xo 13
cau89:CTT dien xoay chieu
Hinh ve
khi co dien ap vao cuon day ,nap mach tu 6 se duoc hut thang ve phia loi tinh 5 ,tren 5 co gan vong dong chong dung tan , lam cho tiep diem dong 1 tiep xuc voi tiep diem tinh 4 .tiep diem tinh duoc gan voi thanh dan 3 ,dau kia cua thanh dan co vit bat day dien vao .cac lo so tiep diem 2 co tac dung duy tri 1 luc ep can thiet len tiep diem .dong thoi he thong tiep diem phu 12 cung duoc dong vao mo ra .lo so nha 7 day toan bo phan dong cua ctt9 len phia tren khi cat dien vao cuon day .toan bo duoc dat trong vo nhua 10
Cau 90; khai niem khoi dong tu,cau tao ,hoat dong khoi dong tu don
Khoi dong tu la khi cu dien dung de dieu khien tu xa viec dong cat ,dao chieu quay ,bao ve qua tai cho dong co xoay chieu 3pha rotor long soc
Cau tao cua khoi dong tu gom ctt ,role nhiet lap chung 1 hop . khoi dong tu co 1 ctt goi la khoi dong tu don.khoi dong tu co 2 tcc goi la khoi dong tu kep
Nguyen ly lam viec (hinh)
Cac phan tu cua so do
CB;aptomat nguon
M;dong co khong dong bo 3pha
Cc cau chi
K cong tac to
RT role nhiet
KĐ , D cac nut an khoi dong va dung
Khoi dong ;an nut kđ cua cuon day ctt co dien ,cac tiep diem k cua no o mach dong luc dong lai ,dong co dien duoc cap dien va se quay. dong thoi tiep diem k o mach dk dong lai duy tri cho cuon k khi khong an nut kđ nua
Dung; an nut KdDDcuon day cua ctt dien, cac tiep diem K cua no o mach dong luc dong lai,dong co dien dc cap dien va se quay.Dong thoi tiep diem K o mach dieu khien dong lau duy tri cho cuon K khi khong an nut KĐ nua
Dừng: an nut dung D, cuon day cua ctt mat dien ,cac tiep diem cua K mo ra cat dien vao cuon day,dong co dừng
Cau 91 khoi dong tu kep
hinh ve
thuc hien dao chieu quay dong co bang cach doi thu tu 2 trong 3 pha dat vao dong co,khoi dong tu kep gom 2 ctt K1va K2 dc noi liên động ve dien va co the ca ve co khi. LIên động dc thuc hien bang cac tiep diem phu thuong dong k1va k2 cua ctt K1 vaK2 o mach dk dong thoi cac nut khoi dong theo chieu thuan(KĐT) hoac theo chieu nguoc (KĐN) cung co o mach dong luc dong lai, dong co dc cap dien va quay theo chieu thuan dong thoi k1 mở ra dam bao cho cuon day ctt K2 khong the co dien. Qua trinh quay nguoc cung tuong tu khi ta an nut KDDN. dừng dong co cho ca 2 chieu bang nut dừng D, bao ve qua tai bang role nhiet va bao ve ngan mach bang cau chi
