直流电机负荷(he)侧定子线(xian)(xian)圈(quan)端(duan)(duan)头部的(de)(de)一(yi)小段三相(xiang)引(yin)入(ru)、出(chu)线(xian)(xian)及绕(rao)(rao)组内(nei)线(xian)(xian)圈(quan)与线(xian)(xian)圈(quan)的(de)(de)连接线(xian)(xian)，是有形(xing)状、向(xiang)心且随绕(rao)(rao)组圆周排列着，电(dian)机在启动时产生的(de)(de)电(dian)磁力对端(duan)(duan)部未经过绑(bang)扎、固定处理的(de)(de)会造成(cheng)危害。 在某次启动高压电(dian)动机的(de)(de)当(dang)时，发生了(le)某相(xiang)的(de)(de)引(yin)入(ru)或引(yin)出(chu)线(xian)(xian)的(de)(de)一(yi)根因受电(dian)磁力而折断，折断时拉起的(de)(de)电(dian)弧将紧(jin)靠近(jin)的(de)(de)线(xian)(xian)圈(quan)与线(xian)(xian)圈(quan)的(de)(de)连接线(xian)(xian)打(da)断，并附(fu)近(jin)绕(rao)(rao)组的(de)(de)端(duan)(duan)头部小局部烧损较严重，转子笼条会变形(xing)引(yin)起振(zhen)动。 

当(dang)电(dian)(dian)(dian)机在启动(dong)时(shi)刻的瞬间，启动(dong)电(dian)(dian)(dian)流很大，因(yin)此线间的吸(xi)引力(li)或(huo)排斥力(li)也很大，实际上(shang)噶(ga)压感(gan)应(ying)电(dian)(dian)(dian)动(dong)机在端(duan)部未经过加固(gu)处理时(shi)，曾出现(xian)过不少次电(dian)(dian)(dian)机在启动(dong)一定次数或(huo)运行时(shi)铜(tong)棒被折断！ 

    根据直流电机三相(xiang)(xiang)(xiang)(xiang)(xiang)绕(rao)组(zu)的(de)(de)(de)(de)整体连(lian)(lian)(lian)接(jie)(jie)(jie)，又根据给水泵电(dian)(dian)(dian)(dian)(dian)机为三相(xiang)(xiang)(xiang)(xiang)(xiang) 2 级、并联方(fang)式。Y 接(jie)(jie)(jie)线(xian)(xian)，在三相(xiang)(xiang)(xiang)(xiang)(xiang)正弦交(jiao)流电(dian)(dian)(dian)(dian)(dian)按周期变化的(de)(de)(de)(de)时刻（出(chu)(chu)某相(xiang)(xiang)(xiang)(xiang)(xiang)在零值外）连(lian)(lian)(lian)接(jie)(jie)(jie)线(xian)(xian)内(nei) 6 对相(xiang)(xiang)(xiang)(xiang)(xiang)互直接(jie)(jie)(jie)靠(kao)近(jin)的(de)(de)(de)(de)是(shi)用(yong)圆粗铜(tong)棒连(lian)(lian)(lian)接(jie)(jie)(jie)的(de)(de)(de)(de)，从(cong)绕(rao)组(zu)接(jie)(jie)(jie)线(xian)(xian)方(fang)式而定，有 3 对是(shi)不(bu)(bu)同(tong)(tong)相(xiang)(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)(de) 2 根引(yin)(yin)入(ru)线(xian)(xian)，另 3 对是(shi)不(bu)(bu)同(tong)(tong)相(xiang)(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)(de) 2 根引(yin)(yin)出(chu)(chu)线(xian)(xian)，总有 2 对电(dian)(dian)(dian)(dian)(dian)流方(fang)向(xiang)一(yi)致，4 对电(dian)(dian)(dian)(dian)(dian)流方(fang)向(xiang)相(xiang)(xiang)(xiang)(xiang)(xiang)反，其受力(li)情况见从(cong)图(tu)中可清楚看到(dao)，由于这(zhei)(zhei) 2 对分别电(dian)(dian)(dian)(dian)(dian)流相(xiang)(xiang)(xiang)(xiang)(xiang)同(tong)(tong)和相(xiang)(xiang)(xiang)(xiang)(xiang)反，本身(shen)在受相(xiang)(xiang)(xiang)(xiang)(xiang)互排(pai)斥力(li)和吸引(yin)(yin)力(li)，又加(jia)上各自近(jin)处线(xian)(xian)圈坚决线(xian)(xian)的(de)(de)(de)(de)吸引(yin)(yin)力(li)或(huo)排(pai)斥力(li)，所以(yi)(yi)易受折损和折断；当 2 根不(bu)(bu)同(tong)(tong)相(xiang)(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)(de)引(yin)(yin)入(ru)线(xian)(xian)或(huo)引(yin)(yin)出(chu)(chu)线(xian)(xian)同(tong)(tong)时被电(dian)(dian)(dian)(dian)(dian)磁力(li)折断，则加(jia)在电(dian)(dian)(dian)(dian)(dian)机绕(rao)组(zu)上的(de)(de)(de)(de)三相(xiang)(xiang)(xiang)(xiang)(xiang)电(dian)(dian)(dian)(dian)(dian)压的(de)(de)(de)(de)不(bu)(bu)对称度极(ji)度偏差，这(zhei)(zhei)不(bu)(bu)但使电(dian)(dian)(dian)(dian)(dian)机定转子的(de)(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)流快速增(zeng)大，温度急剧升高，转子笼条受强(qiang)电(dian)(dian)(dian)(dian)(dian)磁作(zuo)用(yong)力(li)向(xiang)转动方(fang)向(xiang)变弯(wan)曲，保护(hu)瞬间动作(zuo)后引(yin)(yin)惯性作(zuo)用(yong)又能将转子笼条甩弯(wan)，并近(jin)处绕(rao)组(zu)和绕(rao)组(zu)连(lian)(lian)(lian)接(jie)(jie)(jie)严重烧损。因此这(zhei)(zhei) 6 对及临(lin)近(jin)的(de)(de)(de)(de)连(lian)(lian)(lian)接(jie)(jie)(jie)线(xian)(xian)就成为重点加(jia)固支撑(cheng)的(de)(de)(de)(de)部位(wei)，若不(bu)(bu)支撑(cheng)加(jia)固所出(chu)(chu)现的(de)(de)(de)(de)危害有以(yi)(yi)下几种情况： 

1、  2 根不同向引入或 2 根引出线全部排断，排断时瞬间电流将端部绕组严重烧损，直流电机出(chu)现(xian)(xian)这种情况时，转子出(chu)现(xian)(xian)平衡受破坏现(xian)(xian)象可能(neng)更(geng)严重。 

2、除上述(shu)外，其他除靠近(jin)相的引(yin)入或引(yin)出(chu)线部位(wei)的打(da)扰子(zi)连接线均受(shou)排斥或拉力(li)，引(yin)电流方(fang)向随(sui)周期规律变(bian)化，这就形成了自然(ran)的自身(shen)频率振动(dong)，长期能使金属连线受(shou)疲(pi)劳(lao)，允许中一旦断(duan)(duan)开要出(chu)现打(da)断(duan)(duan)临近(jin)连续和绕(rao)组端部烧损(sun)，也(ye)能引(yin)起振动(dong)。

3、有(you)时只是某相引(yin)入或引(yin)出线根(gen)被排断，排断时拉开(kai)的电弧又将临近的线圈连线打(da)断，出现了端部绕(rao)组小局部受(shou)损，绝缘受(shou)破坏(huai)，会(hui)引(yin)起振动。