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 動機是接成星形還是接成三角形，應視廠家規定而進行，可以從電動機銘牌上查到。三相定子繞組的首末端是生產廠家事先設定好的，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，但絕不可單獨將一相繞組的首末端顛倒，否則將產生接線錯誤。如果接線盒中發 生接線錯誤，或者繞組首末端弄錯，輕則電動機不能正常起動，長時間通電造成啟動電流過 大，電動機發熱嚴重，影響壽命，重則燒毀電動機繞組，或造成電源短路。

三相異步電動機如果是△接線就沒有中性點，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，當三相負載平衡時，此點的電壓為零，Ua+Ub+Uc=Um*sin(wt)+Um*sin(wt-120°)+Um*sin(wt+120°)=0，詳細計算過程省略，此點可接零線。

鄭娟萍

廈門仲鑫航自動化設備有限公司  

如果三相線電壓為380V,則電機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，故中性點發生偏移，定子上加載的線電壓也發生波動，和原來三相負載平衡時相比，電流還在這三相負載中流動，但電流也發生了波動，比如某相流入，另兩相流出，但三相負載中總電流還是平衡的，根據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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