異(yi)(yi)步(bu)(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)氣(qi)(qi)(qi)隙(xi)(xi)是(shi)很小的(de)(de)(de)(de)，中(zhong)小型電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)一般為(wei)0.2～2mm。氣(qi)(qi)(qi)隙(xi)(xi)越(yue)大(da)(da)(da)(da)，磁(ci)(ci)(ci)阻(zu)越(yue)大(da)(da)(da)(da)，要(yao)產(chan)生同(tong)樣大(da)(da)(da)(da)小的(de)(de)(de)(de)磁(ci)(ci)(ci)場，就需(xu)要(yao)較大(da)(da)(da)(da)的(de)(de)(de)(de)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)流。由(you)于氣(qi)(qi)(qi)隙(xi)(xi)的(de)(de)(de)(de)存在，異(yi)(yi)步(bu)(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)磁(ci)(ci)(ci)路(lu)磁(ci)(ci)(ci)阻(zu)遠比變(bian)壓器(qi)(qi)為(wei)大(da)(da)(da)(da)，因而(er)異(yi)(yi)步(bu)(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)流也比變(bian)壓器(qi)(qi)的(de)(de)(de)(de)大(da)(da)(da)(da)得多。變(bian)壓器(qi)(qi)的(de)(de)(de)(de)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)流約為(wei)額定電(dian)(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)3%，異(yi)(yi)步(bu)(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)流約為(wei)額定電(dian)(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)30%。勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)流是(shi)無(wu)功(gong)電(dian)(dian)(dian)(dian)(dian)(dian)流，因而(er)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)流越(yue)大(da)(da)(da)(da)。繞(rao)(rao)組(zu)是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)組(zu)成部分，老化、受(shou)潮、受(shou)熱(re)、受(shou)侵蝕、異(yi)(yi)物侵入(ru)、外(wai)力的(de)(de)(de)(de)沖擊都會造成對繞(rao)(rao)組(zu)的(de)(de)(de)(de)傷害，電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)(ji)過載、欠電(dian)(dian)(dian)(dian)(dian)(dian)壓、過電(dian)(dian)(dian)(dian)(dian)(dian)壓，缺相運行也能(neng)引起繞(rao)(rao)組(zu)故障。繞(rao)(rao)組(zu)故障一般分為(wei)繞(rao)(rao)組(zu)接地、短路(lu)、開(kai)路(lu)、接線錯(cuo)誤。如今分別說(shuo)明故障現象、產(chan)生的(de)(de)(de)(de)原(yuan)因及檢查方(fang)法。三(san)相異(yi)(yi)步(bu)(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)轉子通常(chang)采(cai)用(yong)鼠籠式(shi)結(jie)構，可以根據需(xu)要(yao)進(jin)行不同(tong)形狀(zhuang)和(he)(he)材(cai)料的(de)(de)(de)(de)設(she)計。呼和(he)(he)浩(hao)特繞(rao)(rao)線式(shi)三(san)相異(yi)(yi)步(bu)(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)(ji)

渦流(liu)式轉(zhuan)(zhuan)子由許(xu)多(duo)平(ping)行(xing)的導(dao)(dao)體(ti)(ti)(ti)箔(bo)組(zu)成(cheng)，導(dao)(dao)體(ti)(ti)(ti)箔(bo)間(jian)相(xiang)互隔離，形(xing)狀像(xiang)一個平(ping)面上(shang)的旋(xuan)渦，因此(ci)得名。在電(dian)(dian)機(ji)運(yun)行(xing)時，由于感(gan)應電(dian)(dian)動(dong)勢的作用，導(dao)(dao)體(ti)(ti)(ti)箔(bo)中會產生電(dian)(dian)流(liu)，從而在導(dao)(dao)體(ti)(ti)(ti)箔(bo)中產生磁場，受到旋(xuan)轉(zhuan)(zhuan)磁場的作用，轉(zhuan)(zhuan)子開始轉(zhuan)(zhuan)動(dong)。三(san)(san)(san)相(xiang)異(yi)(yi)(yi)步(bu)電(dian)(dian)動(dong)機(ji)具有轉(zhuan)(zhuan)速穩(wen)定、運(yun)行(xing)可靠(kao)、噪(zao)音小、體(ti)(ti)(ti)積(ji)小、效(xiao)率高等優點，被(bei)普遍應用于各種(zhong)工(gong)業和民用領域(yu)，如風(feng)電(dian)(dian)、水泵(beng)、風(feng)扇、壓縮機(ji)、機(ji)床等。三(san)(san)(san)相(xiang)異(yi)(yi)(yi)步(bu)電(dian)(dian)動(dong)機(ji)如何(he)接(jie)(jie)線？三(san)(san)(san)相(xiang)異(yi)(yi)(yi)步(bu)電(dian)(dian)動(dong)機(ji)的接(jie)(jie)線通常分為星型(xing)接(jie)(jie)法和三(san)(san)(san)角(jiao)形(xing)接(jie)(jie)法兩種(zhong)。陜(shan)西(xi)y型(xing)三(san)(san)(san)相(xiang)異(yi)(yi)(yi)步(bu)電(dian)(dian)動(dong)機(ji)三(san)(san)(san)相(xiang)異(yi)(yi)(yi)步(bu)電(dian)(dian)動(dong)機(ji)的電(dian)(dian)機(ji)轉(zhuan)(zhuan)子和定子之間(jian)的電(dian)(dian)氣絕緣需要(yao)保持良好，以避免電(dian)(dian)擊和故障。

星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)改(gai)角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)：原(yuan)星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)除(chu)以1.732等(deng)于(yu)角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)的(de)(de)(de)(de)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)。角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)改(gai)星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)：原(yuan)角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)乘以1.732等(deng)于(yu)星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)的(de)(de)(de)(de)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)。星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)與角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)本質上的(de)(de)(de)(de)區別(bie)：星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)線(xian)(xian)電(dian)(dian)(dian)(dian)壓(ya)等(deng)于(yu)相電(dian)(dian)(dian)(dian)壓(ya)的(de)(de)(de)(de)1.732倍(bei)，相電(dian)(dian)(dian)(dian)流(liu)(liu)等(deng)于(yu)線(xian)(xian)電(dian)(dian)(dian)(dian)流(liu)(liu)。角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)相電(dian)(dian)(dian)(dian)壓(ya)等(deng)于(yu)線(xian)(xian)電(dian)(dian)(dian)(dian)壓(ya)，線(xian)(xian)電(dian)(dian)(dian)(dian)流(liu)(liu)等(deng)于(yu)相電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)1.732倍(bei)。同(tong)功率的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)機，星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)，線(xian)(xian)徑(jing)粗，匝數少，角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)，線(xian)(xian)徑(jing)細，匝數多。角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)的(de)(de)(de)(de)截(jie)面(mian)(mian)(mian)積(ji)(ji)是星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)的(de)(de)(de)(de)0.58倍(bei)。（即(ji)角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)除(chu)以0.58等(deng)于(yu)星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)的(de)(de)(de)(de)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)。星(xing)(xing)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)乘以0.58等(deng)于(yu)角(jiao)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)時(shi)(shi)(shi)的(de)(de)(de)(de)線(xian)(xian)徑(jing)總(zong)(zong)截(jie)面(mian)(mian)(mian)積(ji)(ji)）。

按(an)轉(zhuan)(zhuan)(zhuan)子結(jie)構(gou)的(de)(de)不同(tong)，三相異(yi)步電(dian)動機(ji)(ji)可分為(wei)籠式和(he)繞(rao)線式兩種。籠式轉(zhuan)(zhuan)(zhuan)子的(de)(de)異(yi)步電(dian)動機(ji)(ji)結(jie)構(gou)簡(jian)單、運(yun)行可靠、重量輕、價格便宜，得到了普(pu)遍的(de)(de)應用(yong)，其(qi)主(zhu)要(yao)缺點是(shi)調速困難。繞(rao)線式三相異(yi)步電(dian)動機(ji)(ji)的(de)(de)轉(zhuan)(zhuan)(zhuan)子和(he)定(ding)子一樣也設置(zhi)了三相繞(rao)組(zu)并(bing)通過滑環、電(dian)刷與外部變阻器連接。調節(jie)變阻器電(dian)阻可以(yi)改(gai)善電(dian)動機(ji)(ji)的(de)(de)起動性能和(he)調節(jie)電(dian)動機(ji)(ji)的(de)(de)轉(zhuan)(zhuan)(zhuan)速。當向三相定(ding)子繞(rao)組(zu)中通入對稱的(de)(de)三相交流電(dian)時(shi)，就產生了一個以(yi)同(tong)步轉(zhuan)(zhuan)(zhuan)速n1沿定(ding)子和(he)轉(zhuan)(zhuan)(zhuan)子內圓空間作(zuo)順時(shi)針(zhen)方向旋轉(zhuan)(zhuan)(zhuan)的(de)(de)旋轉(zhuan)(zhuan)(zhuan)磁場。三相異(yi)步電(dian)動機(ji)(ji)的(de)(de)定(ding)子線圈通常(chang)采(cai)用(yong)繞(rao)組(zu)式結(jie)構(gou)，可以(yi)根據需要(yao)進行串聯或并(bing)聯。

AVR損(sun)(sun)(sun)壞(huai)的(de)(de)(de)(de)主要原因是什么(me)？上(shang)海穎達機(ji)電(dian)(dian)(dian)工業設備有限公司小(xiao)編介(jie)紹，發電(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)壓越(yue)穩(wen)(wen)(wen)定，AVR內的(de)(de)(de)(de)變(bian)動頻率(lv)(lv)越(yue)小(xiao)；比(bi)較電(dian)(dian)(dian)路中的(de)(de)(de)(de)晶(jing)體管的(de)(de)(de)(de)開關(guan)動作越(yue)小(xiao)，AVR損(sun)(sun)(sun)壞(huai)的(de)(de)(de)(de)幾率(lv)(lv)越(yue)小(xiao)；輸(shu)出負載(zai)(zai)相(xiang)對平穩(wen)(wen)(wen)，AVR內的(de)(de)(de)(de)變(bian)動頻率(lv)(lv)越(yue)小(xiao)，比(bi)較電(dian)(dian)(dian)路中的(de)(de)(de)(de)晶(jing)體管的(de)(de)(de)(de)開關(guan)動作越(yue)小(xiao)，AVR損(sun)(sun)(sun)壞(huai)的(de)(de)(de)(de)幾率(lv)(lv)越(yue)小(xiao)；柴油機(ji)的(de)(de)(de)(de)轉速越(yue)穩(wen)(wen)(wen)定，變(bian)化電(dian)(dian)(dian)流對AVR的(de)(de)(de)(de)振(zhen)蕩(dang)沖擊越(yue)小(xiao)；經常性的(de)(de)(de)(de)“游車”和超負載(zai)(zai)，三相(xiang)負載(zai)(zai)相(xiang)差太大是造成(cheng)AVR損(sun)(sun)(sun)壞(huai)的(de)(de)(de)(de)主要原因；選擇帶E、F、C燃油系(xi)統的(de)(de)(de)(de)發電(dian)(dian)(dian)機(ji)組，由于頻率(lv)(lv)變(bian)動小(xiao)，AVR的(de)(de)(de)(de)使用會更可靠(kao)。三相(xiang)異步(bu)電(dian)(dian)(dian)動機(ji)的(de)(de)(de)(de)應用范圍包括風(feng)力(li)發電(dian)(dian)(dian)、水泵(beng)、壓縮(suo)機(ji)、風(feng)扇、輸(shu)送機(ji)等。北京變(bian)頻三相(xiang)異步(bu)電(dian)(dian)(dian)動機(ji)

三(san)相異步(bu)電(dian)(dian)(dian)動機的(de)控(kong)制方式(shi)包括變頻(pin)控(kong)制、軟啟動控(kong)制、定子(zi)電(dian)(dian)(dian)阻控(kong)制等。呼和浩(hao)特繞線(xian)式(shi)三(san)相異步(bu)電(dian)(dian)(dian)動機

如(ru)(ru)果負(fu)載突然增加，或電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓突然降(jiang)低使T2>Tmax時(shi)，則電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機轉(zhuan)(zhuan)(zhuan)速(su)(su)迅下(xia)(xia)降(jiang)，進(jin)入bc段，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機的(de)(de)(de)電(dian)(dian)(dian)(dian)磁(ci)轉(zhuan)(zhuan)(zhuan)矩隨轉(zhuan)(zhuan)(zhuan)速(su)(su)的(de)(de)(de)下(xia)(xia)降(jiang)而減小，導致電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機迅速(su)(su)停止運(yun)轉(zhuan)(zhuan)(zhuan)，這(zhe)種現(xian)象(xiang)稱為(wei)堵轉(zhuan)(zhuan)(zhuan)。堵轉(zhuan)(zhuan)(zhuan)后，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機中(zhong)的(de)(de)(de)電(dian)(dian)(dian)(dian)流立即(ji)升高(gao)為(wei)額定電(dian)(dian)(dian)(dian)流的(de)(de)(de)數倍，如(ru)(ru)果沒有保護措施及時(shi)切(qie)斷電(dian)(dian)(dian)(dian)源，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機將可(ke)能被燒毀(hui)。這(zhe)種調(diao)(diao)(diao)速(su)(su)方法是用改變(bian)定子(zi)繞組的(de)(de)(de)接(jie)線方式來改變(bian)籠型電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機定子(zi)極對(dui)數達到調(diao)(diao)(diao)速(su)(su)目的(de)(de)(de)，特點如(ru)(ru)下(xia)(xia)：1、具有較(jiao)硬的(de)(de)(de)機械特性(xing)，穩定性(xing)良好；2、無(wu)轉(zhuan)(zhuan)(zhuan)差(cha)損耗，效率(lv)高(gao)；3、接(jie)線簡(jian)單、控制(zhi)方便、價(jia)格低；4、有級調(diao)(diao)(diao)速(su)(su)，級差(cha)較(jiao)大，不能獲(huo)得(de)平滑調(diao)(diao)(diao)速(su)(su)；5、可(ke)以與調(diao)(diao)(diao)壓調(diao)(diao)(diao)速(su)(su)、電(dian)(dian)(dian)(dian)磁(ci)轉(zhuan)(zhuan)(zhuan)差(cha)離合(he)器配合(he)使用，獲(huo)得(de)較(jiao)高(gao)效率(lv)的(de)(de)(de)平滑調(diao)(diao)(diao)速(su)(su)特性(xing)。呼和浩特繞線式三相異步(bu)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機

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