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电机集电环的更换与运行

文章出处:葡京彩票 人气:发表时间:2018-01-12 09:24

正常运行时,三相(xiang)绕组通过集电环引出(chu)的电阻短(duan)接(jie)。上(shang)绕有对称的三相(xiang)绕组。启(qi)动时,在转子(zi)绕组中串入(ru)一(yi)个启(qi)动电阻,达到了减小启(qi)动电流的目的。

对于(yu)集(ji)电(dian)环面轻微烧痕、麻(ma)点、刷痕等缺(que)陷(xian),可(ke)用油石、细锉打磨,最后用零零号砂布打光。在一般情(qing)况下(xia),不应轻易车削(xue)集(ji)电(dian)环,因车削(xue)一次(ci)便会降低很多寿命,但在下(xia)列(lie)情(qing)况下(xia),应考虑(lv)车旋铜(tong)环的外径:

1、当铜环表面(mian)磨(mo)损和烧伤程(cheng)度比较严重,深度超(chao)过1mm,面(mian)积(ji)占总面(mian)积(ji)的20%~30%,并且靠手(shou)工打磨(mo)已(yi)无法恢(hui)复原状,不能保证电机正常(chang)运(yun)行时;

2、电机转速在1000r/min及以(yi)上(shang)的集电环,其径向(xiang)偏摆超过0.05mm;

3、转(zhuan)速在(zai)100r/min以下的(de)集电(dian)环,径向偏摆在(zai)0.08mm时。

车(che)旋(xuan)铜环(huan)外径(jing)时,要求车(che)刀锋利,进(jin)刀量要小,切削速度约1~1.5m/s。车(che)削深度以消除缺陷为限。车(che)旋(xuan)后的电(dian)机集电(dian)环(huan)工作面偏摆不(bu)应超过0.03~0.05mm。轴颈径(jing)向跳(tiao)动不(bu)大(da)于(yu)0.1%,各(ge)环(huan)直(zhi)径(jing)之(zhi)差不(bu)应超过外径(jing)的1%。

怎么更换电(dian)机集电(dian)环(huan)呢?

1.加宽电(dian)(dian)机集(ji)电(dian)(dian)环(huan)(huan)。现(xian)有电(dian)(dian)机集(ji)电(dian)(dian)环(huan)(huan)宽度为40mm,改造(zao)后电(dian)(dian)机集(ji)电(dian)(dian)环(huan)(huan)宽度将增加为80mm,增大电(dian)(dian)机集(ji)电(dian)(dian)环(huan)(huan)的(de)(de)宽度可以提高集(ji)电(dian)(dian)环(huan)(huan)的(de)(de)散热(re)性能,且(qie)有利于(yu)电(dian)(dian)刷和刷握安装方式的(de)(de)改造(zao)。

2.改(gai)电(dian)(dian)(dian)机(ji)集电(dian)(dian)(dian)环环面(mian)为(wei)螺旋沟槽(cao)环面(mian)。旧电(dian)(dian)(dian)机(ji)集电(dian)(dian)(dian)环环面(mian)均(jun)为(wei)平面(mian)结构,容(rong)易(yi)导(dao)致电(dian)(dian)(dian)刷(shua)表面(mian)形成(cheng)微小的(de)气膜,不利于碳刷(shua)和集电(dian)(dian)(dian)环环面(mian)的(de)充分接触。新电(dian)(dian)(dian)机(ji)集电(dian)(dian)(dian)环环面(mian)采(cai)用螺旋沟槽(cao)环面(mian)。

3.增(zeng)加上下(xia)电(dian)机(ji)(ji)集(ji)电(dian)环的(de)间距。增(zeng)加电(dian)机(ji)(ji)集(ji)电(dian)环间距的(de)主(zhu)要目的(de)在(zai)于防(fang)止机(ji)(ji)组突然抬(tai)机(ji)(ji)而(er)导致(zhi)上下(xia)电(dian)机(ji)(ji)集(ji)电(dian)环之间短路,减(jian)小(xiao)电(dian)机(ji)(ji)集(ji)电(dian)环环面烧蚀的(de)概(gai)率。

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