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訂閱社區雜誌 |
| 【變頻器】關於變頻調速電動機端子上電壓波形的分析 |
| （時間:2026-03-26 03:00:00） |
隨著微電子技術和現代控製理論在交流變頻調速係統中的應用，變頻器(或逆變器)dexingnengyededaofeiyuexingdetigao，bingyuelaiyueguangfandiyingyongyugongyeshengchanherichanggongzuodexuduolingyuzhizhong。danshi，bianpinqishuchudejuyoudoushangshengyanhuoxiajiangyandemaichongdianyaquezaidiandongjijiexianduanzijiraozushangchanshengleguodianya，zaochengdiandongjiraozujueyuandeguozaopohuai。shiyanyanjiubiaoming，hengaodedianyashangshenglv(dv/dt)在電動機繞組上產生極不均勻的電壓分布，且隨著變頻器與電動機之間電纜(線)長(chang)度(du)的(de)增(zeng)加(jia)，在(zai)電(dian)動(dong)機(ji)接(jie)線(xian)端(duan)子(zi)上(shang)產(chan)生(sheng)高(gao)頻(pin)振(zhen)蕩(dang)的(de)過(guo)電(dian)壓(ya)，當(dang)電(dian)纜(lan)長(chang)度(du)超(chao)過(guo)某(mou)一(yi)臨(lin)界(jie)值(zhi)後(hou)，電(dian)動(dong)機(ji)端(duan)子(zi)上(shang)過(guo)電(dian)壓(ya)的(de)幅(fu)值(zhi)達(da)到(dao)變(bian)頻(pin)器(qi)輸(shu)出(chu)電(dian)壓(ya)的(de)2倍，長時間重複性的電壓應力的作用將導致電動機繞組匝間絕緣的過早破壞。
為wei了le降jiang低di電dian動dong機ji端duan子zi上shang高gao頻pin振zhen蕩dang的de過guo電dian壓ya，最zui適shi宜yi的de方fang法fa之zhi一yi是shi在zai電dian動dong機ji端duan子zi上shang安an裝zhuang特te殊shu設she計ji的de濾lv波bo器qi。濾lv波bo器qi的de參can數shu與yu變bian頻pin器qi特te性xing及ji電dian纜lan參can數shu有you關guan，然ran而er變bian頻pin器qi、電纜及電機一般都不是同一製造商或銷售商提供，變頻器的開關特性、dianlancanshujichangdudebuquedingxing，shidelvboqidecanshuxuanzejuyoubugudingxing。guanyulvboqidecanshuyudianjiduandianyahuodianliutexingdeguanxi，muqianhaiweiyouxitongyanjiudebaodao。benwenzhuyaoyanjiuzaibutongdianlanchangduxia，lvboqidecanshuduidianjiduandianyatexingdeyingxiang，quedingdianlanchangdu、濾lv波bo器qi的de電dian阻zu和he電dian容rong與yu電dian機ji端duan子zi過guo電dian壓ya幅fu值zhi及ji脈mai衝chong上shang升sheng沿yan時shi間jian的de關guan係xi，找zhao出chu濾lv波bo器qi參can數shu的de選xuan擇ze範fan圍wei，為wei變bian頻pin調tiao速su驅qu動dong係xi統tong的de製zhi造zao和he使shi用yong提ti供gong試shi驗yan依yi據ju和he理li論lun基ji礎chu。
變(bian)頻(pin)調(tiao)速(su)驅(qu)動(dong)係(xi)統(tong)中(zhong)，造(zao)成(cheng)電(dian)機(ji)端(duan)子(zi)產(chan)生(sheng)高(gao)頻(pin)振(zhen)蕩(dang)過(guo)電(dian)壓(ya)的(de)原(yuan)因(yin)，用(yong)傳(chuan)輸(shu)線(xian)理(li)論(lun)可(ke)以(yi)很(hen)好(hao)地(di)解(jie)釋(shi)，並(bing)且(qie)通(tong)過(guo)試(shi)驗(yan)研(yan)究(jiu)也(ye)進(jin)一(yi)步(bu)得(de)到(dao)證(zheng)實(shi)，它(ta)是(shi)造(zao)成(cheng)電(dian)機(ji)絕(jue)緣(yuan)過(guo)早(zao)破(po)壞(huai)的(de)原(yuan)因(yin)之(zhi)一(yi)，因(yin)此(ci)為(wei)了(le)延(yan)長(chang)電(dian)機(ji)壽(shou)命(ming)，除(chu)了(le)提(ti)高(gao)電(dian)機(ji)自(zi)身(shen)的(de)絕(jue)緣(yuan)水(shui)平(ping)外(wai)，還(hai)必(bi)須(xu)盡(jin)最(zui)大(da)可(ke)能(neng)抑(yi)製(zhi)過(guo)電(dian)壓(ya)的(de)浪(lang)湧(yong)衝(chong)擊(ji)。
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