變(bian)(bian)頻(pin)(pin)調(diao)(diao)(diao)(diao)速(su)(su)是改變(bian)(bian)電(dian)(dian)動機(ji)定(ding)子電(dian)(dian)源(yuan)的頻(pin)(pin)率，從而改變(bian)(bian)其同步(bu)(bu)轉速(su)(su)的調(diao)(diao)(diao)(diao)速(su)(su)方法(fa)。變(bian)(bian)頻(pin)(pin)調(diao)(diao)(diao)(diao)速(su)(su)系統主要(yao)設備是提供變(bian)(bian)頻(pin)(pin)電(dian)(dian)源(yuan)的變(bian)(bian)頻(pin)(pin)器，變(bian)(bian)頻(pin)(pin)器可(ke)分成(cheng)交(jiao)(jiao)流(liu)－直流(liu)－交(jiao)(jiao)流(liu)變(bian)(bian)頻(pin)(pin)器和交(jiao)(jiao)流(liu)－交(jiao)(jiao)流(liu)變(bian)(bian)頻(pin)(pin)器兩大(da)(da)類，國內大(da)(da)都使用(yong)交(jiao)(jiao)－直－交(jiao)(jiao)變(bian)(bian)頻(pin)(pin)器。其特(te)(te)點：1、效率高，調(diao)(diao)(diao)(diao)速(su)(su)過(guo)程(cheng)中沒(mei)有附加損耗；2、應用(yong)范圍廣，可(ke)用(yong)于籠(long)型異(yi)(yi)步(bu)(bu)電(dian)(dian)動機(ji)；3、調(diao)(diao)(diao)(diao)速(su)(su)范圍大(da)(da)，特(te)(te)性硬，精度(du)高；4、技術復雜，造價高，維護檢(jian)修困難。該方法(fa)適用(yong)于要(yao)求精度(du)高、調(diao)(diao)(diao)(diao)速(su)(su)性能較(jiao)好場合。調(diao)(diao)(diao)(diao)速(su)(su)裝置故障(zhang)時可(ke)以切(qie)換至(zhi)全速(su)(su)運行(xing)，避免停產；晶閘(zha)管(guan)串級調(diao)(diao)(diao)(diao)速(su)(su)功率因數偏低，諧(xie)波(bo)影(ying)響較(jiao)大(da)(da)。三(san)相異(yi)(yi)步(bu)(bu)電(dian)(dian)動機(ji)的啟(qi)動電(dian)(dian)流(liu)通常(chang)是額定(ding)電(dian)(dian)流(liu)的3-7倍，需要(yao)注意對電(dian)(dian)網的影(ying)響。山西礦用(yong)隔爆(bao)型三(san)相異(yi)(yi)步(bu)(bu)電(dian)(dian)動機(ji)

AVR損壞的主要原因是什么？上海(hai)穎達機(ji)(ji)(ji)電(dian)(dian)工(gong)業設備有限公(gong)司小(xiao)編介紹，發電(dian)(dian)機(ji)(ji)(ji)電(dian)(dian)壓越(yue)穩定(ding)，AVR內(nei)的變(bian)動(dong)頻(pin)率越(yue)小(xiao)；比較(jiao)電(dian)(dian)路(lu)中(zhong)(zhong)的晶體(ti)管的開關動(dong)作(zuo)越(yue)小(xiao)，AVR損壞的幾率越(yue)小(xiao)；輸出負載相(xiang)(xiang)(xiang)對平穩，AVR內(nei)的變(bian)動(dong)頻(pin)率越(yue)小(xiao)，比較(jiao)電(dian)(dian)路(lu)中(zhong)(zhong)的晶體(ti)管的開關動(dong)作(zuo)越(yue)小(xiao)，AVR損壞的幾率越(yue)小(xiao)；柴(chai)油機(ji)(ji)(ji)的轉速(su)越(yue)穩定(ding)，變(bian)化(hua)電(dian)(dian)流對AVR的振蕩沖擊越(yue)小(xiao)；經常性(xing)的“游車”和超負載，三(san)相(xiang)(xiang)(xiang)負載相(xiang)(xiang)(xiang)差太大(da)是造成AVR損壞的主要原因；選擇(ze)帶E、F、C燃油系統的發電(dian)(dian)機(ji)(ji)(ji)組，由于頻(pin)率變(bian)動(dong)小(xiao)，AVR的使用會(hui)更(geng)可(ke)靠。齒(chi)輪減(jian)速(su)三(san)相(xiang)(xiang)(xiang)異步電(dian)(dian)動(dong)機(ji)(ji)(ji)銷售(shou)價格三(san)相(xiang)(xiang)(xiang)異步電(dian)(dian)動(dong)機(ji)(ji)(ji)的定(ding)子(zi)線圈通常采(cai)用繞組式結構，可(ke)以根據需要進(jin)行串聯或并(bing)聯。

定子(zi)(zi)三(san)相繞組是異(yi)步(bu)(bu)電(dian)(dian)(dian)動機(ji)的(de)(de)(de)電(dian)(dian)(dian)路部(bu)分，在異(yi)步(bu)(bu)電(dian)(dian)(dian)動機(ji)的(de)(de)(de)運行中起著很重要的(de)(de)(de)作用，是把電(dian)(dian)(dian)能(neng)轉(zhuan)換為(wei)機(ji)械能(neng)的(de)(de)(de)關鍵部(bu)件(jian)。定子(zi)(zi)三(san)相繞組的(de)(de)(de)結構是對(dui)稱(cheng)的(de)(de)(de)，一般(ban)有(you)六(liu)個出(chu)線端U1、U2、V1、V2、W1、W2，置于(yu)機(ji)座外側的(de)(de)(de)接(jie)線盒內，根據需要接(jie)成星形（Y）或三(san)角形（△），。定子(zi)(zi)鐵(tie)(tie)心(xin)是異(yi)步(bu)(bu)電(dian)(dian)(dian)動機(ji)磁路的(de)(de)(de)一部(bu)分，由于(yu)主磁場以同步(bu)(bu)轉(zhuan)速相對(dui)定子(zi)(zi)旋轉(zhuan)，為(wei)減小在鐵(tie)(tie)心(xin)中引起的(de)(de)(de)損(sun)耗(hao)，鐵(tie)(tie)心(xin)采(cai)用0.5mm厚的(de)(de)(de)高導磁硅(gui)鋼片(pian)疊成，硅(gui)鋼片(pian)兩(liang)面(mian)涂(tu)有(you)絕(jue)緣漆(qi)以減小鐵(tie)(tie)心(xin)的(de)(de)(de)渦流(liu)損(sun)耗(hao)。

三(san)相(xiang)異(yi)步電(dian)動機(ji)各部(bu)分說明(ming)：①外殼(ke)，三(san)相(xiang)異(yi)步電(dian)動機(ji)的(de)(de)外殼(ke)主要由機(ji)座、軸承(cheng)蓋、端(duan)蓋、接線盒、風扇和(he)罩殼(ke)等組(zu)成(cheng)。②定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)，定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)有(you)定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)鐵芯(xin)和(he)定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)繞組(zu)組(zu)成(cheng)。a、定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)鐵芯(xin)。定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)鐵芯(xin)通常由很多圓環(huan)狀(zhuang)的(de)(de)硅(gui)鋼片疊合(he)在一起組(zu)成(cheng)，這些硅(gui)鋼片中(zhong)間(jian)開有(you)很多小槽用于(yu)嵌入定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)繞組(zu)（也稱定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)線圈），硅(gui)鋼片上涂(tu)有(you)絕(jue)緣層，使疊片之間(jian)絕(jue)緣。b、定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)繞組(zu)。它通常由涂(tu)有(you)絕(jue)緣漆的(de)(de)銅線繞制而成(cheng)，再將繞制好(hao)的(de)(de)銅線按一定(ding)(ding)(ding)(ding)(ding)(ding)的(de)(de)規律嵌入定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)鐵芯(xin)的(de)(de)小槽內，具體放大部(bu)分。三(san)相(xiang)異(yi)步電(dian)動機(ji)的(de)(de)電(dian)機(ji)轉子(zi)和(he)定(ding)(ding)(ding)(ding)(ding)(ding)子(zi)之間(jian)的(de)(de)潤滑需要保持良好(hao)，以保證電(dian)機(ji)的(de)(de)正常工作和(he)壽命。

由于旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)以n1轉(zhuan)速旋(xuan)轉(zhuan)，轉(zhuan)子(zi)(zi)導(dao)(dao)(dao)體(ti)開始時(shi)是(shi)靜止的(de)(de)，故轉(zhuan)子(zi)(zi)導(dao)(dao)(dao)體(ti)將(jiang)切割(ge)定(ding)(ding)子(zi)(zi)旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)而產(chan)生(sheng)感(gan)應電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)勢(shi)(shi)（感(gan)應電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)勢(shi)(shi)的(de)(de)方(fang)(fang)(fang)向(xiang)用右手(shou)定(ding)(ding)則(ze)判定(ding)(ding)）。由于轉(zhuan)子(zi)(zi)導(dao)(dao)(dao)體(ti)兩端被短(duan)路(lu)(lu)環(huan)短(duan)接(jie)，在(zai)感(gan)應電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)勢(shi)(shi)的(de)(de)作(zuo)用下，轉(zhuan)子(zi)(zi)導(dao)(dao)(dao)體(ti)中將(jiang)產(chan)生(sheng)與感(gan)應電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)勢(shi)(shi)方(fang)(fang)(fang)向(xiang)基本一致(zhi)的(de)(de)感(gan)生(sheng)電(dian)(dian)(dian)(dian)(dian)流(liu)。轉(zhuan)子(zi)(zi)的(de)(de)載(zai)流(liu)導(dao)(dao)(dao)體(ti)在(zai)定(ding)(ding)子(zi)(zi)磁(ci)(ci)(ci)(ci)場(chang)中受到電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)的(de)(de)作(zuo)用（力(li)的(de)(de)方(fang)(fang)(fang)向(xiang)用左手(shou)定(ding)(ding)則(ze)判定(ding)(ding)）。電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)對(dui)轉(zhuan)子(zi)(zi)軸(zhou)產(chan)生(sheng)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)轉(zhuan)矩(ju)，驅(qu)動(dong)(dong)(dong)(dong)轉(zhuan)子(zi)(zi)沿(yan)著旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)方(fang)(fang)(fang)向(xiang)旋(xuan)轉(zhuan)，電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)工作(zuo)原理(li)為(wei)：當電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)的(de)(de)三(san)相(xiang)定(ding)(ding)子(zi)(zi)繞組(zu)(zu)（各相(xiang)差120度(du)電(dian)(dian)(dian)(dian)(dian)角度(du)），通入三(san)相(xiang)對(dui)稱交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)后(hou)，將(jiang)產(chan)生(sheng)一個(ge)旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)，該旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)切割(ge)轉(zhuan)子(zi)(zi)繞組(zu)(zu)，從而在(zai)轉(zhuan)子(zi)(zi)繞組(zu)(zu)中產(chan)生(sheng)感(gan)應電(dian)(dian)(dian)(dian)(dian)流(liu)（轉(zhuan)子(zi)(zi)繞組(zu)(zu)是(shi)閉合(he)通路(lu)(lu)），載(zai)流(liu)的(de)(de)轉(zhuan)子(zi)(zi)導(dao)(dao)(dao)體(ti)在(zai)定(ding)(ding)子(zi)(zi)旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)作(zuo)用下將(jiang)產(chan)生(sheng)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)，從而在(zai)電(dian)(dian)(dian)(dian)(dian)機(ji)(ji)轉(zhuan)軸(zhou)上形(xing)成(cheng)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)轉(zhuan)矩(ju)，驅(qu)動(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)旋(xuan)轉(zhuan)，并且電(dian)(dian)(dian)(dian)(dian)機(ji)(ji)旋(xuan)轉(zhuan)方(fang)(fang)(fang)向(xiang)與旋(xuan)轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)方(fang)(fang)(fang)向(xiang)相(xiang)同。三(san)相(xiang)異步電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)的(de)(de)電(dian)(dian)(dian)(dian)(dian)機(ji)(ji)轉(zhuan)子(zi)(zi)和(he)定(ding)(ding)子(zi)(zi)之間的(de)(de)機(ji)(ji)械(xie)接(jie)觸需要保(bao)持良好(hao)，以避免磨損(sun)和(he)損(sun)壞。蘭州(zhou)y型三(san)相(xiang)異步電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)

三相異步電(dian)動機結構簡單，制(zhi)造容易，運(yun)行可(ke)靠，堅固(gu)耐(nai)用，且維護比較方便。山(shan)西礦用隔爆型三相異步電(dian)動機

串(chuan)級(ji)(ji)(ji)調(diao)(diao)(diao)速是指繞線(xian)式電動(dong)機(ji)轉(zhuan)(zhuan)(zhuan)子回路中串(chuan)入可調(diao)(diao)(diao)節的(de)(de)附(fu)加電勢(shi)來改變(bian)電動(dong)機(ji)的(de)(de)轉(zhuan)(zhuan)(zhuan)差(cha)，達到(dao)調(diao)(diao)(diao)速的(de)(de)目(mu)的(de)(de)。大部分(fen)轉(zhuan)(zhuan)(zhuan)差(cha)功(gong)率(lv)被(bei)串(chuan)入的(de)(de)附(fu)加電勢(shi)所(suo)吸收(shou)，再(zai)利用(yong)(yong)產(chan)生(sheng)附(fu)加的(de)(de)裝置，把(ba)吸收(shou)的(de)(de)轉(zhuan)(zhuan)(zhuan)差(cha)功(gong)率(lv)返回電網(wang)或轉(zhuan)(zhuan)(zhuan)換能量加以利用(yong)(yong)。根據(ju)轉(zhuan)(zhuan)(zhuan)差(cha)功(gong)率(lv)吸收(shou)利用(yong)(yong)方(fang)式，串(chuan)級(ji)(ji)(ji)調(diao)(diao)(diao)速可分(fen)為(wei)電機(ji)串(chuan)級(ji)(ji)(ji)調(diao)(diao)(diao)速、機(ji)械(xie)串(chuan)級(ji)(ji)(ji)調(diao)(diao)(diao)速及晶閘(zha)管(guan)串(chuan)級(ji)(ji)(ji)調(diao)(diao)(diao)速形式，多(duo)采用(yong)(yong)晶閘(zha)管(guan)串(chuan)級(ji)(ji)(ji)調(diao)(diao)(diao)速，其(qi)特點為(wei)：1、可將調(diao)(diao)(diao)速過程(cheng)中的(de)(de)轉(zhuan)(zhuan)(zhuan)差(cha)損耗回饋到(dao)電網(wang)或生(sheng)產(chan)機(ji)械(xie)上(shang)，效率(lv)較(jiao)高(gao)；2、裝置容量與調(diao)(diao)(diao)速范(fan)圍成(cheng)正比，投資省，適用(yong)(yong)于(yu)調(diao)(diao)(diao)速范(fan)圍在額定轉(zhuan)(zhuan)(zhuan)速70%－90%的(de)(de)生(sheng)產(chan)機(ji)械(xie)上(shang)；山西礦用(yong)(yong)隔爆型三相異步電動(dong)機(ji)

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