Makhalidwe a BMC yopangidwa ndi pulasitiki yama motor terminal

Monga momwe dzinalo likusonyezera, amotor terminal blockndi makina opangira ma waya opangira ma waya.Malinga ndi mitundu yosiyanasiyana yolumikizira ma waya, kapangidwe ka block block ndi kosiyananso.Chifukwa mota wamba imagwira ntchito kwa nthawi yayitali, imatulutsa kutentha, ndipo kutentha kwagalimoto kumakhala kokwera kwambiri.Kuphatikiza apo, injiniyo iyenera kukumana ndi zochitika zosiyanasiyana zogwirira ntchito, ndipo ntchito zake zimakhala zovuta.Chifukwa chake, zida zama wiring board ziyenera kukhala ndi zabwino zoonekeratu pakukana kutentha, kutchinjiriza ndi zida zamakina.

M'mbuyomu, zida za ceramic nthawi zambiri zimagwiritsidwa ntchito popanga ma terminals, koma ngakhale kukana kutentha kwa zida za ceramic ndikwapamwamba, mphamvu zake sizokwanira, ndipo ndizosavuta kupanga kugawikana pakuyika ndikugwiritsa ntchito.Zida zapulasitiki zimagwiritsidwanso ntchito popanga midadada yamagalimoto, koma kukana kutentha kwa pulasitiki sikwabwino.Pulasitiki ndiyosavuta kukalamba pansi pa kutentha kwakukulu kwa nthawi yayitali, zomwe zimachepetsa magwiridwe antchito a midadada yama terminal.M'mbuyomu, midadada yambiri yamagalimoto idapangidwa ndi phenolic resin, yomwe imadziwika kuti bakelite.Komabe,zinthu za bakelitezapita patsogolo poyerekeza ndi zipangizo ziwiri zam'mbuyo, koma mtundu wa zipangizo bakelite ndi monotonous ndi mphamvu si zabwino kwambiri.Kuwonekera kwa zida za BMC kumapangitsa kuti zida zomangira ma motor terminal zizipita ku zida za BMC.

Zithunzi za BMCnthawi zambiri amatchedwa unsaturated polyester gulu akamaumba pawiri ku China.Zida zazikulu zopangira ndi misa prepreg yopangidwa ndi GF (unsaturated resin), MD (filler) ndi zowonjezera zosiyanasiyana.Zida za BMC zidagwiritsidwa ntchito koyamba ku West Germany ndi Britain m'ma 1960, kenako zidapangidwa kwambiri ku United States ndi Japan m'ma 1970 ndi 1980 motsatana.Chifukwa zinthu za BMC zili ndi magwiridwe antchito abwino kwambiri amagetsi, magwiridwe antchito amakina, kukana kutentha ndi kukana kwa dzimbiri, zomwe sizimangokwaniritsa zofunikira zamitundu yosiyanasiyana yamagalimoto, komanso zimagwirizana ndi njira yopangira kuti zithandizire kupanga kwakukulu kwa midadada yama terminal. Zinthu za BMC zitha kulowa m'malo mwa bakelite kupanga midadada yama terminal yamagalimoto.