F8650A 双处理器F8650A 双处理器

第二相绕组的 首端D2与*相绕组的末端D4相连接，再接入第二相电源；

　　第三相绕组的首端D3与第 二相绕组的末端D5相连接，再接入第三相电源。

　　即在接线板上将接线柱D1和D6、D2和D4、D3和D5分别用铜片连接起来，再分别接入三相电。

　　一台电 动机是接成星形还是接成三角形，应视厂家规定而进行，可以从电动机铭牌上查到。三相定子绕组的首末端是生产厂家事先设定好的，绝不可任意颠倒，但可将三相绕组的首末端一 起颠倒，例如将三相绕组的末端D4、D5、D6倒过来作为首端，而将D1、D2、D3作为末端，但绝不可单独将一相绕组的首末端颠倒，否则将产生接线错误。如果接线盒中发 生接线错误，或者绕组首末端弄错，轻则电动机不能正常起动，长时间通电造成启动电流过 大，电动机发热严重，影响寿命，重则烧毁电动机绕组，或造成电源短路。

三相异步电动机如果是△接线就没有中性点，也就不会有零线的接线端子；星形的话:由于星形接线有个中性点，当三相负载平衡时，此点的电压为零，Ua+Ub+Uc=Um*sin(wt)+Um*sin(wt-120°)+Um*sin(wt+120°)=0，详细计算过程省略，此点可接零线。

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郑娟萍

厦门仲鑫航自动化设备有限公司  

如果三相线电压为380V,则电机每相绕组上加载的电压为220v。再看线电流，由于 Ia+Ib+Ic=Im*cos(wt)+Im*cos(wt-120 °)+Im*cos(wt+120°)=0，故不用接零线，接了也没用嘛，又不流过电流。不平衡也不接零线则由Ua/Za+Ub/Zb+Uc/Zc决定，此式不等于0，故中性点发生偏移，定子上加载的线电压也发生波动，和原来三相负载平衡时相比，电流还在这三相负载中流动，但电流也发生了波动，比如某相流入，另两相流出，但三相负载中总电流还是平衡的，根据是基尔霍夫电流定律也就是流入多少，还流出多少。

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