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电机集电环的更换与运行 你了解多少

文章出(chu)处:葡京彩票 人气:发表时间:2018-01-16 09:10

正(zheng)常运行时,三相(xiang)绕组通过集(ji)电(dian)环(huan)引出的(de)(de)电(dian)阻(zu)短接。上绕有对称的(de)(de)三相(xiang)绕组。启(qi)(qi)动(dong)时,在转子(zi)绕组中串入一(yi)个启(qi)(qi)动(dong)电(dian)阻(zu),达到了减小启(qi)(qi)动(dong)电(dian)流的(de)(de)目的(de)(de)。

对于集电环面轻微烧痕、麻点、刷痕等缺陷,可用(yong)油石、细锉打磨,最后用(yong)零零号(hao)砂(sha)布(bu)打光。在一般情况(kuang)下,不(bu)应轻易车削集电环,因(yin)车削一次便会降低很多寿命,但在下列情况(kuang)下,应考虑车旋铜环的外径:

1、当铜环表面磨(mo)损和烧伤程度比较严重,深度超过(guo)1mm,面积占总面积的20%~30%,并且靠手工打磨(mo)已无法(fa)恢复原状,不能保证电机正(zheng)常运行(xing)时(shi);

2、电机(ji)转速在1000r/min及以上的集电环,其(qi)径(jing)向(xiang)偏摆超过0.05mm;

3、转(zhuan)速在100r/min以下的集(ji)电环,径向偏摆在0.08mm时(shi)。

车(che)(che)(che)旋铜环(huan)外(wai)径时,要(yao)求(qiu)车(che)(che)(che)刀锋利,进刀量要(yao)小(xiao),切(qie)削速度(du)约1~1.5m/s。车(che)(che)(che)削深度(du)以消除缺陷为限(xian)。车(che)(che)(che)旋后的电(dian)机集电(dian)环(huan)工(gong)作(zuo)面偏摆(bai)不(bu)应超过(guo)0.03~0.05mm。轴颈径向跳动不(bu)大于0.1%,各环(huan)直径之差不(bu)应超过(guo)外(wai)径的1%。

怎么更换电机(ji)集电环呢?

1.加(jia)宽(kuan)电(dian)(dian)机(ji)集电(dian)(dian)环。现(xian)有(you)(you)电(dian)(dian)机(ji)集电(dian)(dian)环宽(kuan)度(du)为(wei)40mm,改造后(hou)电(dian)(dian)机(ji)集电(dian)(dian)环宽(kuan)度(du)将增加(jia)为(wei)80mm,增大电(dian)(dian)机(ji)集电(dian)(dian)环的宽(kuan)度(du)可(ke)以提高集电(dian)(dian)环的散热性(xing)能(neng),且有(you)(you)利于电(dian)(dian)刷和刷握安装方式的改造。

2.改电(dian)(dian)机(ji)集(ji)(ji)电(dian)(dian)环环面(mian)为螺旋(xuan)沟槽环面(mian)。旧(jiu)电(dian)(dian)机(ji)集(ji)(ji)电(dian)(dian)环环面(mian)均为平(ping)面(mian)结构,容易导致电(dian)(dian)刷表面(mian)形成微(wei)小的(de)气膜,不利于碳(tan)刷和(he)集(ji)(ji)电(dian)(dian)环环面(mian)的(de)充分接触。新电(dian)(dian)机(ji)集(ji)(ji)电(dian)(dian)环环面(mian)采用螺旋(xuan)沟槽环面(mian)。

3.增加上下电(dian)(dian)(dian)机集(ji)(ji)电(dian)(dian)(dian)环的间距。增加电(dian)(dian)(dian)机集(ji)(ji)电(dian)(dian)(dian)环间距的主(zhu)要目的在于(yu)防止机组突然抬机而导致(zhi)上下电(dian)(dian)(dian)机集(ji)(ji)电(dian)(dian)(dian)环之间短路,减小电(dian)(dian)(dian)机集(ji)(ji)电(dian)(dian)(dian)环环面烧蚀的概率。

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