脈(mo)寬(kuan)調(diao)制（PWM）把(ba)每(mei)半個(ge)(ge)周期內，輸(shu)出電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)波形(xing)分割成若(ruo)干個(ge)(ge)脈(mo)沖(chong)(chong)波，每(mei)個(ge)(ge)脈(mo)沖(chong)(chong)的(de)(de)寬(kuan)度(du)為T1，每(mei)兩(liang)個(ge)(ge)脈(mo)沖(chong)(chong)間的(de)(de)間隔寬(kuan)度(du)為T2，那么脈(mo)沖(chong)(chong)的(de)(de)占(zhan)空(kong)比Υ=T1/（T1+T2）。這(zhe)時，電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)平(ping)均值(zhi)(zhi)和占(zhan)空(kong)比成正比，所以(yi)在調(diao)節(jie)頻(pin)率時，不改(gai)變(bian)(bian)(bian)直流電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)幅(fu)值(zhi)(zhi)，而是改(gai)變(bian)(bian)(bian)輸(shu)出電(dian)(dian)(dian)壓(ya)(ya)脈(mo)沖(chong)(chong)的(de)(de)占(zhan)空(kong)比，也同(tong)樣可以(yi)實現變(bian)(bian)(bian)頻(pin)也變(bian)(bian)(bian)壓(ya)(ya)的(de)(de)效果(guo)。當電(dian)(dian)(dian)壓(ya)(ya)周期增大（頻(pin)率降(jiang)低），電(dian)(dian)(dian)壓(ya)(ya)脈(mo)沖(chong)(chong)的(de)(de)幅(fu)值(zhi)(zhi)不變(bian)(bian)(bian)，而占(zhan)空(kong)比在減小，故平(ping)均電(dian)(dian)(dian)壓(ya)(ya)降(jiang)低。此法的(de)(de)特點是，變(bian)(bian)(bian)頻(pin)器在改(gai)變(bian)(bian)(bian)輸(shu)出頻(pin)率的(de)(de)同(tong)時，也改(gai)變(bian)(bian)(bian)輸(shu)出電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)脈(mo)沖(chong)(chong)占(zhan)空(kong)比（幅(fu)值(zhi)(zhi)不變(bian)(bian)(bian)）故稱為脈(mo)寬(kuan)調(diao)制，常用PWM(Pulsewidthmodulation)表示(shi)。變(bian)(bian)(bian)頻(pin)器維修的(de)(de)步驟(zou)是什么？安川(chuan)變(bian)(bian)(bian)頻(pin)器維修哪里好

故(gu)障判斷1、整流(liu)模塊(kuai)損壞(huai)(huai)通常(chang)是(shi)由(you)于電(dian)(dian)(dian)(dian)(dian)網電(dian)(dian)(dian)(dian)(dian)壓或(huo)內部(bu)短路(lu)(lu)引(yin)(yin)起(qi)。在(zai)排除內部(bu)短路(lu)(lu)情況下，更(geng)換(huan)整流(liu)橋。在(zai)現(xian)場處理故(gu)障時，應重點檢查用戶電(dian)(dian)(dian)(dian)(dian)網情況，如電(dian)(dian)(dian)(dian)(dian)網電(dian)(dian)(dian)(dian)(dian)壓，有(you)無電(dian)(dian)(dian)(dian)(dian)焊機等對電(dian)(dian)(dian)(dian)(dian)網有(you)污染的(de)設(she)備(bei)等。2、逆變(bian)模塊(kuai)損壞(huai)(huai)通常(chang)是(shi)由(you)于電(dian)(dian)(dian)(dian)(dian)機或(huo)電(dian)(dian)(dian)(dian)(dian)纜損壞(huai)(huai)及驅(qu)動電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)故(gu)障引(yin)(yin)起(qi)。在(zai)修復驅(qu)動電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)之(zhi)后(hou)，測驅(qu)動波形良(liang)好狀(zhuang)態下，更(geng)換(huan)模塊(kuai)。在(zai)現(xian)場服務中(zhong)更(geng)換(huan)驅(qu)動板之(zhi)后(hou)，須注意檢查馬達及連(lian)接電(dian)(dian)(dian)(dian)(dian)纜。在(zai)確定(ding)無任何故(gu)障下，才(cai)能運行變(bian)頻(pin)器。3、上電(dian)(dian)(dian)(dian)(dian)無顯示(shi)通常(chang)是(shi)由(you)于開關電(dian)(dian)(dian)(dian)(dian)源損壞(huai)(huai)或(huo)軟充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)損壞(huai)(huai)使直流(liu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)無直流(liu)電(dian)(dian)(dian)(dian)(dian)引(yin)(yin)起(qi)，如啟動電(dian)(dian)(dian)(dian)(dian)阻損壞(huai)(huai)，操(cao)作(zuo)面板損壞(huai)(huai)同(tong)樣會產(chan)生這(zhe)種狀(zhuang)況。余姚各品牌變(bian)頻(pin)器維修費(fei)用變(bian)頻(pin)器維修需要(yao)多少錢？

絕緣柵(zha)(zha)雙極(ji)(ji)晶體(ti)(ti)管（IGBT）IGBT是MOSFET和GTR相結(jie)合(he)的(de)產物，是柵(zha)(zha)極(ji)(ji)為絕緣柵(zha)(zha)結(jie)構（MOS結(jie)構）的(de)晶體(ti)(ti)管，它的(de)三個極(ji)(ji)分(fen)別是集電(dian)極(ji)(ji)C、發射極(ji)(ji)E和柵(zha)(zha)極(ji)(ji)G。工(gong)作(zuo)特(te)點是，控(kong)制部(bu)分(fen)與場(chang)效應晶體(ti)(ti)管相同(tong)，控(kong)制信號為電(dian)壓信號Uge,輸入阻(zu)抗(kang)很高，柵(zha)(zha)極(ji)(ji)電(dian)流(liu)(liu)I≈0，故驅動功率(lv)很小(xiao)。而起主電(dian)路部(bu)分(fen)則與GTR相同(tong)，工(gong)作(zuo)電(dian)流(liu)(liu)為集電(dian)極(ji)(ji)電(dian)流(liu)(liu)I。至今，IGBT的(de)擊穿電(dian)壓也已做到1200V，集電(dian)極(ji)(ji)比(bi)較大飽和電(dian)流(liu)(liu)已超過(guo)1500A，由(you)IGBT作(zuo)逆變器(qi)(qi)件的(de)變頻(pin)器(qi)(qi)容量(liang)已達(da)到250KVA以上(shang)。此(ci)外，其工(gong)作(zuo)頻(pin)率(lv)可達(da)20KHZ。由(you)IGBT作(zuo)為逆變器(qi)(qi)件的(de)變頻(pin)器(qi)(qi)的(de)載波頻(pin)率(lv)一(yi)般(ban)都在10KHZ以上(shang)，故電(dian)動機的(de)電(dian)源波形比(bi)較平滑，基(ji)本無電(dian)磁噪聲。在新系(xi)列的(de)中小(xiao)容量(liang)變頻(pin)器(qi)(qi)中，IGBT已處于肯(ken)定優勢的(de)地(di)位！

過(guo)電(dian)(dian)(dian)(dian)保(bao)護(hu)產生(sheng)過(guo)電(dian)(dian)(dian)(dian)壓(ya)的(de)原(yuan)因(yin)及處(chu)理(li)方法(fa)：①電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓(ya)太(tai)高②降(jiang)速時(shi)間(jian)太(tai)短③降(jiang)速過(guo)程中，再生(sheng)制(zhi)動(dong)的(de)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)單元工作不(bu)理(li)想，來不(bu)及放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)，請增加(jia)外接制(zhi)動(dong)電(dian)(dian)(dian)(dian)阻和制(zhi)動(dong)單元④請檢(jian)查(cha)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)回路有(you)沒(mei)有(you)發生(sheng)故障(zhang)，實際并不(bu)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)；對于小功率的(de)變頻器(qi)很有(you)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)阻損(sun)壞(huai)欠電(dian)(dian)(dian)(dian)壓(ya)保(bao)護(hu)產生(sheng)欠電(dian)(dian)(dian)(dian)壓(ya)的(de)原(yuan)因(yin)及處(chu)理(li)方法(fa)：①電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓(ya)太(tai)低②電(dian)(dian)(dian)(dian)源(yuan)缺相(xiang)(xiang)；③整流橋故障(zhang)：如果六個整流二極管(guan)中有(you)部分因(yin)損(sun)壞(huai)而(er)短路，整流后(hou)的(de)電(dian)(dian)(dian)(dian)壓(ya)將(jiang)下(xia)降(jiang)，對于整流器(qi)件和晶閘管(guan)的(de)損(sun)壞(huai)，應注(zhu)意檢(jian)查(cha)，及時(shi)更換。變頻器(qi)維修(xiu)常見故障(zhang)及相(xiang)(xiang)應解決方法(fa) 。

從開關(guan)(guan)變(bian)(bian)壓器(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)一次(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)結(jie)(jie)構(gou)來看，有(you)(you)分立元件構(gou)成(cheng)的(de)(de)(de)(de)(de)和集成(cheng)振(zhen)蕩芯片構(gou)成(cheng)的(de)(de)(de)(de)(de)兩種(zhong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)形式(shi)。因而從振(zhen)蕩信號的(de)(de)(de)(de)(de)來源看，又分為自激（分立零件）和他激式(shi)（IC電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)）開關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源。兩種(zhong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)結(jie)(jie)構(gou)都有(you)(you)應用(yong)。開關(guan)(guan)管有(you)(you)采(cai)(cai)用(yong)雙極型器(qi)(qi)(qi)(qi)件和采(cai)(cai)用(yong)場(chang)效(xiao)應晶體管的(de)(de)(de)(de)(de)。小功率變(bian)(bian)頻(pin)器(qi)(qi)(qi)(qi)采(cai)(cai)用(yong)單(dan)端(duan)(duan)正激式(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，大率變(bian)(bian)頻(pin)器(qi)(qi)(qi)(qi)常采(cai)(cai)用(yong)雙端(duan)(duan)正激式(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)。一般變(bian)(bian)頻(pin)器(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)開關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，常提(ti)(ti)供(gong)(gong)(gong)以下(xia)幾種(zhong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓輸(shu)(shu)出(chu)(chu)：CPU及附屬(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、控(kong)制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、操作(zuo)顯(xian)示面板的(de)(de)(de)(de)(de)+5V供(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)；電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓、溫度等故障檢測電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、控(kong)制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)的(de)(de)(de)(de)(de)±15V供(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)；控(kong)制端(duan)(duan)子、工作(zuo)繼電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)線圈的(de)(de)(de)(de)(de)24V供(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。四(si)(si)路(lu)相互隔離的(de)(de)(de)(de)(de)約為22V的(de)(de)(de)(de)(de)驅動電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)的(de)(de)(de)(de)(de)供(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，該四(si)(si)路(lu)供(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)往往又經穩壓電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)處理成(cheng)+15V、-7.5V的(de)(de)(de)(de)(de)正、負電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源供(gong)(gong)(gong)驅動電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，為IGBT逆變(bian)(bian)輸(shu)(shu)出(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)提(ti)(ti)供(gong)(gong)(gong)激勵電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流。該怎么選擇一個好的(de)(de)(de)(de)(de)變(bian)(bian)頻(pin)器(qi)(qi)(qi)(qi)維修(xiu)公(gong)司(si)？士林變(bian)(bian)頻(pin)器(qi)(qi)(qi)(qi)維修(xiu)報(bao)價

變(bian)頻器(qi)(qi)維(wei)修的(de)工(gong)作原理是什么？安川變(bian)頻器(qi)(qi)維(wei)修哪里好

GTR處于飽和狀(zhuang)態(tai)(tai)時的(de)功(gong)耗是(shi)(shi)很(hen)(hen)(hen)小的(de)。上例(li)中，設Uces=2V，則Ics=Uc/Rc=200/10A=20APc=UcesIcs=220W=40W可見(jian)，與放大(da)狀(zhuang)態(tai)(tai)相比(bi)，相差甚遠。截止(zhi)狀(zhuang)態(tai)(tai)即關(guan)斷狀(zhuang)態(tai)(tai)。這是(shi)(shi)基極電(dian)流Ib≤0的(de)結果。在(zai)截止(zhi)狀(zhuang)態(tai)(tai)，GTR只有很(hen)(hen)(hen)微(wei)弱的(de)漏電(dian)流流過，因此，其(qi)功(gong)耗是(shi)(shi)微(wei)不(bu)足道的(de)。GTR在(zai)逆變電(dian)路(lu)(lu)中是(shi)(shi)用(yong)來作為開關(guan)器件的(de)，工作過程中，總是(shi)(shi)在(zai)飽和狀(zhuang)態(tai)(tai)間進行交替。所以(yi)，逆變用(yong)的(de)GTR的(de)額(e)定(ding)功(gong)耗通常是(shi)(shi)很(hen)(hen)(hen)小的(de)。而如上述，如果GTR處于放大(da)狀(zhuang)態(tai)(tai)，其(qi)功(gong)耗將增大(da)達百(bai)北以(yi)上。所以(yi)，逆變電(dian)路(lu)(lu)中的(de)GTR是(shi)(shi)不(bu)允(yun)許在(zai)放大(da)狀(zhuang)態(tai)(tai)下小作停留的(de)。安川變頻(pin)器維修哪里好

寧波慧修(xiu)(xiu)(xiu)數控科(ke)技(ji)(ji)有(you)(you)限公(gong)司(si)一直專(zhuan)注于(yu)數控技(ji)(ji)術(shu)研發；機(ji)電(dian)設(she)備(bei)及(ji)配件、金屬制(zhi)品、鋰電(dian)池、電(dian)氣自(zi)動化設(she)備(bei)、數控機(ji)床、電(dian)子(zi)(zi)元(yuan)器件、計算機(ji)軟硬件、通信(xin)產(chan)品及(ji)配件、網絡(luo)設(she)備(bei)、安(an)防器材、電(dian)子(zi)(zi)產(chan)品的(de)(de)(de)批發、零售、維(wei)修(xiu)(xiu)(xiu)及(ji)技(ji)(ji)術(shu)服(fu)務(wu)；電(dian)氣工(gong)(gong)(gong)程設(she)計；監控設(she)備(bei)設(she)計、安(an)裝；自(zi)營(ying)或代(dai)理貨物(wu)和技(ji)(ji)術(shu)的(de)(de)(de)進出口(kou)(kou)，但國內限制(zhi)經營(ying)或禁止進出口(kou)(kou)的(de)(de)(de)貨物(wu)和技(ji)(ji)術(shu)除外。，是一家機(ji)械及(ji)行業(ye)設(she)備(bei)的(de)(de)(de)企(qi)業(ye)，擁有(you)(you)自(zi)己的(de)(de)(de)技(ji)(ji)術(shu)體系。公(gong)司(si)目前擁有(you)(you)專(zhuan)業(ye)的(de)(de)(de)技(ji)(ji)術(shu)員(yuan)工(gong)(gong)(gong)，為員(yuan)工(gong)(gong)(gong)提供廣闊(kuo)的(de)(de)(de)發展(zhan)平(ping)臺與(yu)成長空(kong)間，為客戶提供高(gao)質的(de)(de)(de)產(chan)品服(fu)務(wu)，深(shen)受員(yuan)工(gong)(gong)(gong)與(yu)客戶好(hao)評。誠(cheng)實、守信(xin)是對企(qi)業(ye)的(de)(de)(de)經營(ying)要求，也(ye)是我(wo)們(men)做人的(de)(de)(de)基本(ben)準則。公(gong)司(si)致(zhi)力于(yu)打造的(de)(de)(de)變頻器維(wei)修(xiu)(xiu)(xiu)，工(gong)(gong)(gong)業(ye)觸摸(mo)屏(ping)維(wei)修(xiu)(xiu)(xiu)，伺(si)服(fu)驅動器維(wei)修(xiu)(xiu)(xiu)，電(dian)路板(ban)維(wei)修(xiu)(xiu)(xiu)。公(gong)司(si)深(shen)耕變頻器維(wei)修(xiu)(xiu)(xiu)，工(gong)(gong)(gong)業(ye)觸摸(mo)屏(ping)維(wei)修(xiu)(xiu)(xiu)，伺(si)服(fu)驅動器維(wei)修(xiu)(xiu)(xiu)，電(dian)路板(ban)維(wei)修(xiu)(xiu)(xiu)，正積蓄著更大的(de)(de)(de)能量，向更廣闊(kuo)的(de)(de)(de)空(kong)間、更寬泛的(de)(de)(de)領域(yu)拓展(zhan)。

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