F7126電源F7126電源
第二相繞組的 首端D2與*相繞組的末端D4相連接,再接入第二相電源;
第三相繞組的首端D3與第 二相繞組的末端D5相連接,再接入第三相電源。
即在接線板上將接線柱D1和D6、D2和D4、D3和D5分別用銅片連接起來,再分別接入三相電。
一臺電 動機(jī)是接成星形還是接成三角形,應(yīng)視廠家規(guī)定而進(jìn)行,可以從電動機(jī)銘牌上查到。三相定子繞組的首末端是生產(chǎn)廠家事先設(shè)定好的,絕不可任意顛倒,但可將三相繞組的首末端一 起顛倒,例如將三相繞組的末端D4、D5、D6倒過來作為首端,而將D1、D2、D3作為末端,但絕不可單獨(dú)將一相繞組的首末端顛倒,否則將產(chǎn)生接線錯誤。如果接線盒中發(fā) 生接線錯誤,或者繞組首末端弄錯,輕則電動機(jī)不能正常起動,長時間通電造成啟動電流過 大,電動機(jī)發(fā)熱嚴(yán)重,影響壽命,重則燒毀電動機(jī)繞組,或造成電源短路。
三相異步電動機(jī)如果是△接線就沒有中性點(diǎn),也就不會有零線的接線端子;星形的話:由于星形接線有個中性點(diǎn),當(dāng)三相負(fù)載平衡時,此點(diǎn)的電壓為零,Ua+Ub+Uc=Um*sin(wt)+Um*sin(wt-120°)+Um*sin(wt+120°)=0,詳細(xì)計(jì)算過程省略,此點(diǎn)可接零線。
鄭娟萍
廈門仲鑫航自動化設(shè)備有限公司
如果三相線電壓為380V,則電機(jī)每相繞組上加載的電壓為220v。再看線電流,由于 Ia+Ib+Ic=Im*cos(wt)+Im*cos(wt-120 °)+Im*cos(wt+120°)=0,故不用接零線,接了也沒用嘛,又不流過電流。不平衡也不接零線則由Ua/Za+Ub/Zb+Uc/Zc決定,此式不等于0,故中性點(diǎn)發(fā)生偏移,定子上加載的線電壓也發(fā)生波動,和原來三相負(fù)載平衡時相比,電流還在這三相負(fù)載中流動,但電流也發(fā)生了波動,比如某相流入,另兩相流出,但三相負(fù)載中總電流還是平衡的,根據(jù)是基爾霍夫電流定律也就是流入多少,還流出多少。
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