H4136黑馬德國(guó)H4136黑馬德國(guó)
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(lái)，再分別接入三相電。
一臺(tái)電 動(dòng)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(dòng)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(guò)來(lái)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(cuò)誤。如果接線盒中發(fā) 生接線錯(cuò)誤，或者繞組首末端弄錯(cuò)，輕則電動(dòng)機(jī)不能正常起動(dòng)，長(zhǎng)時(shí)間通電造成啟動(dòng)電流過(guò) 大，電動(dòng)機(jī)發(fā)熱嚴(yán)重，影響壽命，重則燒毀電動(dòng)機(jī)繞組，或造成電源短路。
三相異步電動(dòng)機(jī)如果是△接線就沒(méi)有中性點(diǎn)，也就不會(huì)有零線的接線端子；星形的話:由于星形接線有個(gè)中性點(diǎn)，當(dāng)三相負(fù)載平衡時(shí)，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(guò)程省略，此點(diǎn)可接零線。
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鄭娟萍
廈門仲鑫航自動(dòng)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(méi)用嘛，又不流過(guò)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(dòng)，和原來(lái)三相負(fù)載平衡時(shí)相比，電流還在這三相負(fù)載中流動(dòng)，但電流也發(fā)生了波動(dòng)，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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