iiiBESinsffiEa BO THI NGHIEM OONG COf K H O N G D O N G BO 3 PHA GHEP Ndi v m MAY Ul TINH WAT LY L0P121 ^ ^ • / '''' '''' '''' ^ /m ThS Phiing Vi§t Hfii, ThS Le Minh Tan, TS Hokng Van H u | Truong DH Toy Nguye[.]
iiiBESinsffiEa BO THI NGHIEM OONG COf K H O N G D O N G BO PHA GHEP Ndi v m MAY Ul TINH WAT LY L0P121 ^ ^ • / ' ' ' ^ ThS Phiing Vi§t Hfii, T h S Le Minh T a n , T S Hokng Van H u | /m- I.D^tvande Trong chuang trjnh v^t ly lop 12, npi dung kien thurc ve may phat xoay chiSu va dpng CO pha 1^ nhChig npi dung co tinh ung dung thyc tien cao va CO tdc dung giao d\ic ky thuat tong hpp doi voi hoc sinh Day cung la phan kien thuc kho, triru tugng doi v6i hpe sinh (HS) nhu cac khai ni?m ve tu trudng quay, su khong dong bp Bp thi nghi?m ve rno hinh may phat dien xoay ehieu pha hien tai dupe trang bi tai cac truong thong chi minh hoa dupe su xuat hien cua cac suat dien dpng cac cupn day (lam den led sang); thi nghiem (TN) mac tai hinh chi minh hoa dupe dien ap day (U.) l o n h o n dien ap pha (U ); cac kien thuc ve dpng CO pha hoan toan khong co TN ho tro Do do, day cac Truong DH Toy Nguyen ehieu pha, m6i quan h? dinh lupng dipn dp day vd di?n ap pha m^c tai hinh sao, bieu dien sy quay cua vec to tir t r u ^ g , sy khong dfing bg giu-a t6c dp quay cua tir truong va tdc dp quay cua roto ,trong dgng CO di$n pha la rat can thiet, mang tinh thyc tien cao day hpe v^t ly thong T h i l t k l bo thi nghiem v^ dpng CO* khong dong bd pha Bp TN che tao co hai bp phan chinh; Bp dieu khien toe dp dpng CO pha (Hinh l.a) Thiet ke bg dieu khien dgng CO pha CO chue nang chuyen dien dp xoay ehieu pha 220V sang xoay ehieu pha 18V va thay doi dupe dien dp dat vdo dpng CO pha de thay doi toe dp quay roto Dpng CO pha co dien dp g6, lap mpt encoder lOOxung/ vong de toe dp dpng ca Tren trye encoder va dpng ca dupe gan cac banh da co ban kinh nhu vd noi voi mgt spi day cu-roa (Hinh Ic).^ Diing cdm bien dien dp de dien dp xoay ehieu pha, ket noi voi bg ghep noi may tinh de dua dii li^u vdo may tinh va hien thi tren phin mem Bg ghep noi co b§ chuyen doi ADC dung vi dieu khien PIC 18F4550 co dp phan gidi cao vd cam chay true tiq> vao may tinh qua cong USB ma khong can phan mem cai dat Thi nghifm ve may phat di^n xoay ehieu va dong cor khong dong bp pha - Muc dich TN: + Bieu dien dang dien dp xoay ehieu pha va lech pha cua chung Hinh Bd thi nghiem dgng ca pha ngi dung kien thuc tren, giao vien (GV) thudng phdi thong bdo kien thurc hoac ket hop mo phong de thong bdo kien thuc cho HS Viec che tao thi nghiem de minh hga dupe ve dang cua tin hieu dien dp xoay dinh rnurc J V dugc gdn tren mgt de go co lap mpt panel de dau day Ky hieu pha A la AX, pha B \a BY, pha C la CZ Co the dau hinh hoac hinh tam gidc cho cdc cupn day stato (Hinh lb) Tren d^ Ngay nhdn bai 21/12/2012 Ngay duyil dang 25/01/2013 14 • TAP CHI THIET BI GIAO DUC-SO 90-02/2013 + Chung minh bieu thuc quan he giua dien dp day va dien dp pha (Uj =^!JVp) + Chung minh tu trucrag cua dpng CO khong dong h^} pha la tir trudng quay yd toe dp ciia roto nhd hon toe dp NGHIEN CUtJ&l/NG DUNG quay cua tir trudng quaj; - Tten hdnh TN vd ket qud: + Ndi bp giao dien (1) vdi mdy tinh (5) bang ddy cdp USB va n6i ng|udn_ 12VDC cho giao di^n ghep ndi + Noi ngudn di^n xoay ehieu 220V cho bg dieu khien toe dp ddng ca (3) Noi cap PS2 vdo encoder tdc qua jack stereo tren panel md hinh dgng co pha (4) vd jack PS2 tren bp giao dien ghep noi may tinh day, vector mau vdng bieu dien tir trudng tong hpp, qua TN thay rang vector tren quay deu quanh tdm hay tir trudng tong hpp la tir trudng quay Tdc dO ttr trudng quay khdng doi: n, ^ 60.f/p = 3000 v6ng/phut (vdi f = 50 Hz, p = 1) vd tdc dp quay roto (cpt n) dupe bdi encoder, s Id he ' w Hinh Hinh dnh tin hi^u, vector di^n dp pha (a, b) va tit truong cua cugn ddy stato (c) so trupt, chiing dupe ghi vdo bdng s6 li?u Co the thidt ldp thdi gian ghi tu dgng cdc sd lieu(Bdn^ 1) Tir ket qud Bdng cho thay: toe dp quay cua roto (n) ludn ludn nhd hon so vdi toe dp quay cua tir trudng (n,) Tri so trung binh cua ti so U / U la 1,74, vdi sai sd tuong doi 0,93 %; gid tri tren so vdi ket qud ly thuyet Id ff =V3, thi sai so la Hinh Thi nghiem ve mgch dien xoay ehieu pha vd 0,58 % dgng ca pha Ket luan Bg TN ve ddng co khdng + Dau hinh cho dpng + Dau cdc ddu ddy mau CO bang cdch dau cdc diem ciia cdm bien vdi pha A de dong bd ba pha da xay dyng cudi cua cac cupn day stato dien dp pha ( U ) , mdu xanh CO the su dung dgc l$p hoac (X, Y, Z) lai vdi Noi Ian da trdi vdi diem A, B de ket hpp vdi bp TN ve mo hinh lupt pha A, B, C cua dpng co dien dp day (U^) may (X&n t^ trcmg 9) vdijoi pha cua bp dieu Stt n n, s Up Ud Udrtip khiln qua spi day mau do, I 2844 3000 0.05 10 17.17 72 xanh da trdi va xanh luc tuang 2855 3000 0.05 95 74 17.35 2833 3000 0.06 88 1.74 17.18 + Dau dau vao cam bien 2844 3000 0.05 84 17.45 1.77 dien dp pha Ian luot vao cac 2823 3000 0.06 74 17.47 1.79 dilmA,X;B,Y;C,Z 2866 3000 0.04 9.93 16.98 1.71 + Md giao dien day hgc 2855 3000 0.05 17.23 1.74 + Van chi§t dp tren b6 dieu 2877 3000 0.04 99 17.23 1.72 khien de thay doi tir tir dien dp 2855 3000 0.05 73 17.08 1.76 dat vdo dgng ca, quan sdt dang 10 2887 3000 0.04 9.84 17.26 1.75 dien ap pha tren thi (Hinh 1 2887 3000 0.04 1.71 9.96 17.04 3a) cd dang hinh sin, ciing tan 12 2887 0.04 3000 9.92 17.4 1.75 so; vector dien dp hpp 13 2833 3000 0.06 9.84 17 11 mpt goc 120" (Hinh 3b); d 1.74 Hinh 3c, cac vector cung mdu 14 2823 3000 0.06 10 01 1.71 17.09 (do, lye, lam) bieu dien cac tijf 15 2877 3000 0.04 9.75 17.13 1.76 trudng tuong ung ciia cupn J I Bdng cdc thong so ddng ca pha TAP CHI THIfTBI GIAO DUC-SO 90-02/2013 • l l ... 2887 30 00 0.04 9.84 17.26 1.75 dien ap pha tren thi (Hinh 1 2887 30 00 0.04 1.71 9.96 17.04 3a) cd dang hinh sin, ciing tan 12 2887 0.04 30 00 9.92 17.4 1.75 so; vector dien dp hpp 13 2 833 30 00... 2855 30 00 0.05 95 74 17 .35 2 833 30 00 0.06 88 1.74 17.18 + Dau dau vao cam bien 2844 30 00 0.05 84 17.45 1.77 dien dp pha Ian luot vao cac 28 23 3000 0.06 74 17.47 1.79 dilmA,X;B,Y;C,Z 2866 30 00... 0.06 9.84 17 11 mpt goc 120 " (Hinh 3b); d 1.74 Hinh 3c, cac vector cung mdu 14 28 23 3000 0.06 10 01 1.71 17.09 (do, lye, lam) bieu dien cac tijf 15 2877 30 00 0.04 9.75 17. 13 1.76 trudng tuong ung