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调速电机电气故障维修

来源:子昂电机维修 日期:2018-06-24 17:44:20

调速电机电气故障维修

调速电机电气故障维修:

一、调速电机升速后机速又逐渐下降以至停机

  出现这(zhei)种情况,需要(yao)观察调(diao)速电(dian)(dian)(dian)机(ji)(ji)电(dian)(dian)(dian)气柜里的(de)(de)电(dian)(dian)(dian)流(liu)表(biao)指(zhi)针的(de)(de)变化(hua)。如果(guo)其指(zhi)示电(dian)(dian)(dian)流(liu)急(ji)剧增(zeng)大,则主(zhu)(zhu)电(dian)(dian)(dian)机(ji)(ji)的(de)(de)热继(ji)电(dian)(dian)(dian)器等过(guo)载保(bao)护(hu)装(zhuang)置(zhi)必然会产生保(bao)护(hu)动作,使主(zhu)(zhu)电(dian)(dian)(dian)机(ji)(ji)断开三相电(dian)(dian)(dian)源而(er)住手运转。这(zhei)时需要(yao)认真检(jian)查(cha)主(zhu)(zhu)电(dian)(dian)(dian)机(ji)(ji)回路的(de)(de)有关接线元(yuan)件及主(zhu)(zhu)电(dian)(dian)(dian)机(ji)(ji)的(de)(de)交(jiao)流(liu)接触器,调(diao)速电(dian)(dian)(dian)机(ji)(ji)电(dian)(dian)(dian)气柜里的(de)(de)所有热继(ji)电(dian)(dian)(dian)器等过(guo)载保(bao)护(hu)装(zhuang)置(zhi)的(de)(de)接线部位(wei)是否松动,接触是否不良而(er)发热。如果(guo)这(zhei)些部位(wei)有标题题目(mu),则会在(zai)主(zhu)(zhu)电(dian)(dian)(dian)机(ji)(ji)增(zeng)速后,由于电(dian)(dian)(dian)路中(zhong)的(de)(de)导(dao)线和元(yuan)件接触不良使电(dian)(dian)(dian)流(liu)迅速增(zeng)大,而(er)引起保(bao)护(hu)性的(de)(de)停(ting)机(ji)(ji)。

  当调速(su)(su)电(dian)(dian)机运(yun)(yun)转(zhuan)速(su)(su)度较低(di)时(shi),由于主电(dian)(dian)机的(de)(de)工作电(dian)(dian)流(liu)较小而(er)不(bu)会发生气希(xi)望速(su)(su)逐(zhu)渐下降以至停机的(de)(de)情况,但是(shi),当调速(su)(su)电(dian)(dian)机升速(su)(su)时(shi),用电(dian)(dian)负荷大(da),电(dian)(dian)气元件的(de)(de)故障就会显露出来(lai)。在(zai)实际(ji)工作中,有时(shi)可以看到调速(su)(su)电(dian)(dian)机电(dian)(dian)气柜内的(de)(de)接(jie)线(xian)(xian)端子由于导(dao)线(xian)(xian)接(jie)触(chu)不(bu)良而(er)发热,甚至在(zai)连接(jie)处出现氧(yang)(yang)化(hua)物层(ceng),导(dao)线(xian)(xian)的(de)(de)绝(jue)缘外反(fan)烧(shao)焦变色,这(zhei)些标题(ti)题(ti)目(mu)都会严重影(ying)响主传(chuan)动电(dian)(dian)机的(de)(de)正(zheng)常运(yun)(yun)转(zhuan)。这(zhei)时(shi)需要操作人(ren)员当即采取相应措施,如清(qing)理接(jie)线(xian)(xian)端子和(he)导(dao)线(xian)(xian)的(de)(de)接(jie)触(chu)面(mian),紧固接(jie)线(xian)(xian)螺钉,去除(chu)烧(shao)坏了的(de)(de)导(dao)线(xian)(xian)氧(yang)(yang)化(hua)物层(ceng),更换损坏严重的(de)(de)接(jie)线(xian)(xian)端子等。

二、主传动电机运转时噪声较大

  为了调整滑差(cha)电(dian)(dian)(dian)机(ji)动平(ping)衡,其电(dian)(dian)(dian)枢和磁极(ji)(ji)转(zhuan)子(zi)(zi)的(de)两端(duan)分(fen)别(bie)装(zhuang)有配(pei)重(zhong)装(zhuang)置。如果这部分(fen)装(zhuang)置稍有松动,那(nei)么滑差(cha)电(dian)(dian)(dian)机(ji)在高速动弹时就(jiu)(jiu)会偏(pian)离(li)原釆的(de)位置。故障(zhang)如果发生在主(zhu)传动电(dian)(dian)(dian)机(ji)的(de)外瑞面,就(jiu)(jiu)会造成电(dian)(dian)(dian)枢和磁极(ji)(ji)转(zhuan)子(zi)(zi)的(de)局部摩擦,使噪声加(jia)大。这时就(jiu)(jiu)需要(yao)停机(ji)修(xiu)理,恢复电(dian)(dian)(dian)枢和磁极(ji)(ji)转(zhuan)子(zi)(zi)的(de)动平(ping)衡,并(bing)重(zhong)新找好原动平(ping)衡配(pei)重(zhong)的(de)位置并(bing)将其固定(ding)好,使主(zhu)传动电(dian)(dian)(dian)机(ji)正常运转(zhuan)。

调速电机电气故障维修

三、主传动电机运转不正常,轴承发热

  主传(chuan)动电机(ji)(ji)(ji)运(yun)转(zhuan)不(bu)正(zheng)常(chang)滑差电机(ji)(ji)(ji)在(zai)运(yun)转(zhuan)过(guo)程(cheng)中会(hui)剧烈振(zhen)动,引起轴(zhou)承(cheng)(cheng)发热(re)。拆开离合器电枢(shu)与磁(ci)极转(zhuan)子(zi),检查电机(ji)(ji)(ji)的(de)(de)(de)轴(zhou)承(cheng)(cheng)是(shi)否严重缺乏(fa)润滑油(you)脂(zhi)(zhi),而(er)造(zao)成轴(zhou)承(cheng)(cheng)严重磨损,电动机(ji)(ji)(ji)的(de)(de)(de)运(yun)转(zhuan)性(xing)能下降。此时需要更换已(yi)损坏的(de)(de)(de)轴(zhou)承(cheng)(cheng),并加(jia)注好润滑油(you)脂(zhi)(zhi)。正(zheng)常(chang)情况下,应对这部(bu)分机(ji)(ji)(ji)构的(de)(de)(de)所(suo)有部(bu)件(jian)进行一次(ci)清(qing)洗、加(jia)油(you),以(yi)保证主传(chuan)动电机(ji)(ji)(ji)的(de)(de)(de)正(zheng)常(chang)运(yun)行。

四、主机转速周期性下降

  出(chu)现这种情(qing)况(kuang),大(da)多数是(shi)因(yin)机械部(bu)分发生了故(gu)障所引起,调(diao)速电机的胶辊(gun)比较多,每根胶辊(gun)靠轴(zhou)承(cheng)来支(zhi)撑动弹。如(ru)果(guo)某根胶辊(gun)的任何一(yi)端轴(zhou)承(cheng)发生了故(gu)障,都(dou)可能使主(zhu)机的转速周期性(xing)地下(xia)峰,严重(zhong)时(shi),主(zhu)机动弹会(hui)更加挫折(zhe),应当即更换轴(zhou)承(cheng)才行。另(ling)外,应该注意主(zhu)机各(ge)滚(gun)筒(tong)(包括(kuo)印(yin)版,橡皮、压印(yin)滚(gun)筒(tong))的轴(zhou)承(cheng)及其(qi)润滑部(bu)位的工作情(qing)况(kuang)是(shi)否正常,如(ru)果(guo)发生故(gu)障同样会(hui)影响印(yin)刷速度。

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