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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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