NGHIEN CUlJ & UNG DUNG THIET KE, CHE TAG MO HITSH DOING CO DIEN SO DUNG TRONG DAY HOC DO AiN MON VAT Li L O F 9 1 Kh6 khan ciia hgc sinh trong thiet k l , chl tao mo hinh dgng co dien vd hirdrng khac[.]
NGHIEN CUlJ & UNG DUNG THIET KE, CHE TAG MO HITSH DOING CO DIEN SO DUNG TRONG DAY HOC DO AiN MON VAT Li L O F T r i n Vdn Thdnh Truang Cao ddng Sic phgm Ha Nam Kh6 khan ciia hgc sinh thiet k l , c h l tao mo hinh dgng co dien vd hirdrng khac phuc Kho khan thilt k l , chd tgo dgng co didn dd Id: D I dgng CO didn boat dpng dupc, can phdi sir dung day din dd dua d6ng dien vdo khung day ciia dgng co nhung khung day quay se ldm cho day noi dan HS thilt ke, che tgo nhihig dgng CO di?n c6 nguydn tic hogt dgng nhu trdn nhung c6 cau true rat don gian, phu hgp vdi trinh ciia HS Vi vgy, chii de DOng co dien c6 thi dugc thyc hign bdi HS Idp THCS th6ng qua day hgc dy dn (DHDA) khung day trdn, dudng kinh 2cm, khodng 10 -i- 15 vdng U6n day d6ng hodc nh6m de tgo thdnh try d9 khung day Ddt try dd ldn chan dd, dat khung day ldn trdn try dd -Xdp8-!- lOvidn nam chdm g6ra dang ciic chong ldn theo phuong thing diing, Thiet ke, che tao mgt so dat chu6i nam chdm len tren chan dd, phia dudi khung d$ng CO didn dom gian 2.} Dong ca dien mot chieu day N6i cyc ciia bg nguon * Chudn bf.- Day qudn dien mgt chidu vdi try Vdn hdnh md hinh de bing d6ng dudng kinh = 1,0mm; Day d6ng hogc nh6m kiem tra (hinh 2) Md hinh duong kinh (^ = 2,0mm dd - Dong CO di?n cd khung day Hinh } Nguyen tdc hoal dong lam tru dd; Day thep O quay (Sir dung pin trdn logi ciia dong ca dien 2,0mm dd ldm true quay; 1,5V) M6t tim nhya (hogc g6) kfch Md hinh ciing tuong ben ngoai bi xoan lam diit thuoc 10cm X 10cm x 2cm dd tu md hinh nhung khdng sii day Bi gidi quydt kho khMi lam chdn d l ; -^ 10 vidn nam dung bg ngudn dign mgt chieu nay, hgc sinh (HS) nhgn thay cham g6m dgng ciic do; vidn md suf dung vidn pin trdn phai viia co day noi dua dong pin tron loai 1,5V; dinh 6c logi 1,5V mic song song Kit didn vdo dgng co vira chilu ddi 4cm; Bg nguon di?n qua, ta dugc ddng co dign mOt kh6ng CO day ndy dd no khdng mgt chidu: 3V -^ 6V chieu nhu d (hinh 3) Md hinh hi xoin diit Cac phuong an Vdi nhihig linh kien vd - Dgng co didn c6 cu$n day chd tao dgng co didn ca ban dung cu tren ddy, HS c6 the quay (Sir dyng pin trdn loai giai quydt van dd chl tgo c6 thilt kd, chd tgo dugc nhieu 1,5V) gop didn: "Vide dua dong dien m6 hinh dgng ca didn khac - Xdp vidn nam chdm ben ngoai vdo d6ng co dupc Dudi day la mgt so buoc gdm dgng ciic ao chdng ldn thyc hidn b m g each cho ddy tiln hdnh chd tgo dgng co dign theo phuong thing dimg ddn tilp xiic vai khung day m6t chidu don gidn: - Ddt mgt vidn pin trdn logi nhidn vi tri tilp xiic kh6ng 1,5 V len trdn day nam cham * Cdc buac tien hanh c6 dinh md co ihd di chuyen Mo hinh 1- Dpng ca di^n gdm, cue (-) cua vidn pin tiep (tilp xiic dgng)" (hinh 1) xiic vdi mat trdn cua nam Trong day hpc Vgt li lop 9, CO khung day quay (su dung cham giao vidn (GV) co thi huong bp nguon di?n mpt chieu) - Quan day dong m0t - U6n ddy ddng mot Ngay nhQft bdi }0/4/20}2 TAP CHI THIET BI GIAO DUC • SO 81 - 5/2012 • NGHIEN CUtJ & UNG DUNG a) S