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直流電機在運行時電刷下的火花如何處理

文章出處:maituwangluo.com  |  發布時間:2017/10/27 10:28:31  |  瀏覽次數:510
主(zhu)電(dian)(dian)路主(zhu)電(dian)(dian)路直接輸人(ren)220V交流,經晶閘(zha)(zha)管半控橋整流后(hou)供(gong)給電(dian)(dian)動機(ji)電(dian)(dian)樞(shu),整流后(hou)的電(dian)(dian)壓(ya)較高(gao),適合額定(ding)電(dian)(dian)壓(ya)為(wei)150至180V功率小于(yu)2千瓦的直流電(dian)(dian)機(ji)。這(zhe)里(li)晶閘(zha)(zha)管TI和(he)二極(ji)管V3及‘理和(he)V4采用電(dian)(dian)力半導體半臂電(dian)(dian)橋模塊,因此安裝方便,結構緊湊(cou)。
 
直(zhi)流(liu)電(dian)機的勵(li)磁繞組L2由二極(ji)管Vl、V2及借用電(dian)樞回路的V3、V4組成的整流(liu)橋供電(dian),節省了兩(liang)只(zhi)二極(ji)管。
 
為確保(bao)晶閘管(guan)(guan)(guan)(guan)關斷(duan)時(shi),電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)樞電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)連續(xu)(xu)且平(ping)滑在(zai)(zai)主電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)中接人了續(xu)(xu)流(liu)二極(ji)(ji)管(guan)(guan)(guan)(guan)vs及(ji)平(ping)波(bo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)器11-二、同(tong)(tong)步電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)獲取及(ji)脈沖(chong)觸(chu)發(fa)(fa)(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)一(yi)般單相半控(kong)橋整流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)均采(cai)用(yong)單結晶體(ti)管(guan)(guan)(guan)(guan)觸(chu)發(fa)(fa)(fa)(fa)方(fang)(fang)式,同(tong)(tong)步信(xin)號(hao)采(cai)用(yong)穩壓(ya)(ya)(ya)二極(ji)(ji)管(guan)(guan)(guan)(guan)穩壓(ya)(ya)(ya)后的(de)(de)(de)(de)(de)(de)消波(bo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya),缺點(dian)(dian)是(shi)觸(chu)發(fa)(fa)(fa)(fa)脈沖(chong)的(de)(de)(de)(de)(de)(de)移相范(fan)圍減小(xiao)。本電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)采(cai)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源的(de)(de)(de)(de)(de)(de)過零點(dian)(dian)時(shi)刻作(zuo)為同(tong)(tong)步信(xin)號(hao)一(yi)同(tong)(tong)步范(fan)圍可達(da)成1700以(yi)上(shang)。由二極(ji)(ji)管(guan)(guan)(guan)(guan)Vl、、產嘆、V3、V4整流(liu)橋輸(shu)出的(de)(de)(de)(de)(de)(de)單相脈動直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)一(yi)路(lu)徑(jing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)R12、R13分壓(ya)(ya)(ya),21)2穩壓(ya)(ya)(ya)獲得20V的(de)(de)(de)(de)(de)(de)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)作(zuo)為觸(chu)發(fa)(fa)(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)等的(de)(de)(de)(de)(de)(de)工作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源,另一(yi)路(lu)徑(jing)R21、咫(zhi)2分壓(ya)(ya)(ya)送至三極(ji)(ji)昔B(沁的(de)(de)(de)(de)(de)(de)基(ji)(ji)極(ji)(ji)。每當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源過零時(shi)B(;6截止(zhi),而B以(yi)、BGS飽合(he)導(dao)通,B〔科將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容C12短接以(yi)保(bao)證在(zai)(zai)任意電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源半周(zhou)期都(dou)是(shi)從零點(dian)(dian)開始充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian),BGS集(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)輸(shu)出的(de)(de)(de)(de)(de)(de)低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)信(xin)號(hao)使(shi)ICI復(fu)位,其3腳輸(shu)出低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)以(yi)保(bao)證晶閘管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)觸(chu)發(fa)(fa)(fa)(fa)信(xin)號(hao)在(zai)(zai)任意電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源半周(zhou)期內都(dou)以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源過零點(dian)(dian)作(zuo)為基(ji)(ji)準三極(ji)(ji)管(guan)(guan)(guan)(guan)儀乃的(de)(de)(de)(de)(de)(de)集(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)為(?l2充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian),當單結管(guan)(guan)(guan)(guan)BGI導(dao)通時(shi)C12放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)使(shi)三極(ji)(ji)管(guan)(guan)(guan)(guan)氏(shi)泥(ni)飽合(he)導(dao)通,集(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)輸(shu)出的(de)(de)(de)(de)(de)(de)低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)使(shi)ICI置位,其3腳輸(shu)出高電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping),經光電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)藕合(he)器輸(shu)出觸(chu)發(fa)(fa)(fa)(fa)脈沖(chong)送至晶閘管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)門極(ji)(ji)這里(li)時(shi)基(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)SE555的(de)(de)(de)(de)(de)(de)作(zuo)用(yong)是(shi)加(jia)(jia)大脈沖(chong)寬(kuan)(kuan)度(du).脈沖(chong)寬(kuan)(kuan)度(du)值由R6、C7的(de)(de)(de)(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)間常數決定。光電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)禍(huo)合(he)器的(de)(de)(de)(de)(de)(de)作(zuo)用(yong)是(shi)增大脈沖(chong)幅度(du),以(yi)確保(bao)晶閘竹可靠觸(chu)發(fa)(fa)(fa)(fa)導(dao)通。直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機換(huan)向過程產生火花的(de)(de)(de)(de)(de)(de)原因及(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁波(bo)的(de)(de)(de)(de)(de)(de)傳播途徑(jing)和特(te)點(dian)(dian)入手,總結了幾(ji)(ji)個方(fang)(fang)法(fa),提(ti)出了直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機在(zai)(zai)運行時(shi)對(dui)無線電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)產生的(de)(de)(de)(de)(de)(de)干(gan)(gan)擾加(jia)(jia)以(yi)抑制(zhi)的(de)(de)(de)(de)(de)(de)幾(ji)(ji)種可行性方(fang)(fang)法(fa)。方(fang)(fang)便(bian)各大生產商在(zai)(zai)使(shi)用(yong)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機的(de)(de)(de)(de)(de)(de)同(tong)(tong)時(shi)對(dui)當地的(de)(de)(de)(de)(de)(de)無線電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)通訊(xun)產生干(gan)(gan)擾。
 
直(zhi)流電(dian)機運行時,換向過程以(yi)及電(dian)刷和(he)換向器(qi)之間不穩定(ding)的滑(hua)動接觸,是形成(cheng)高頻電(dian)波(bo)的主要原(yuan)因,它以(yi)電(dian)磁波(bo)的形式(shi)向外輻射(she),其射(she)頻頻譜(pu)很寬,輻射(she)能量(liang)(liang)最強的頻率通(tong)常在10~15 kHz范(fan)圍內,而其高頻部分可達300 kHz以(yi)上。這個頻譜(pu)與無線電(dian)通(tong)訊、廣播和(he)電(dian)視等使(shi)用的頻帶相近(jin),因此對(dui)它們產生干(gan)擾。這種干(gan)擾在數百米內都(dou)可察(cha)覺。無線電(dian)裝置離直(zhi)流電(dian)機愈近(jin),干(gan)擾強度就越(yue)大。為(wei)保證無線電(dian)通(tong)訊的質量(liang)(liang),有些場合必須對(dui)直(zhi)流電(dian)機產生的干(gan)擾進(jin)行抑制。
 重慶電機維修
直流電(dian)(dian)(dian)(dian)機(ji)(ji)在(zai)(zai)運行時電(dian)(dian)(dian)(dian)刷(shua)下的(de)(de)(de)火(huo)花(hua),是(shi)一個強烈的(de)(de)(de)高頻(pin)干擾電(dian)(dian)(dian)(dian)源。消(xiao)除電(dian)(dian)(dian)(dian)刷(shua)下的(de)(de)(de)火(huo)花(hua)是(shi)減弱(ruo)干擾源的(de)(de)(de)有效措施。而產生火(huo)花(hua)的(de)(de)(de)原(yuan)因很(hen)多(duo),有電(dian)(dian)(dian)(dian)磁性的(de)(de)(de)、機(ji)(ji)械的(de)(de)(de)、化學的(de)(de)(de)。產生的(de)(de)(de)火(huo)花(hua)是(shi)由機(ji)(ji)械方(fang)面原(yuan)因引起(qi)的(de)(de)(de),如換向器(qi)偏(pian)心,換向器(qi)表面起(qi)伏不平或(huo)不清潔,片間絕緣突出(chu),刷(shua)簧壓(ya)力不合(he)適,以(yi)及電(dian)(dian)(dian)(dian)刷(shua)在(zai)(zai)刷(shua)握中過(guo)松或(huo)過(guo)緊(jin),電(dian)(dian)(dian)(dian)刷(shua)與(yu)換向器(qi)件接觸(chu)不良等。
 
化學方面的(de)(de)原(yuan)因(yin)(yin),如電刷壓力過(guo)大,或在高空缺氧、缺乏水汽,或在具有(you)破壞氧化膜的(de)(de)氣體環境中(zhong)工作,都(dou)會使對電機的(de)(de)良好換(huan)(huan)向(xiang)有(you)重大作用的(de)(de)換(huan)(huan)向(xiang)器表面的(de)(de)氧化亞銅薄膜遭到(dao)破壞,于(yu)(yu)是(shi)引起火花(hua),這都(dou)可(ke)通過(guo)改善工藝和加強維(wei)護來解決(jue)。而產(chan)生火花(hua)的(de)(de)電磁(ci)性(xing)原(yuan)因(yin)(yin)是(shi)由(you)于(yu)(yu)附加換(huan)(huan)向(xiang)電流iadd的(de)(de)出(chu)現。只要換(huan)(huan)向(xiang)回路中(zhong)由(you)iadd建(jian)立的(de)(de)磁(ci)場能量很(hen)大,或由(you)iadd引起的(de)(de)接(jie)觸點上的(de)(de)熱能損耗(hao)很(hen)大,火花(hua)便可(ke)產(chan)生。

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