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為什么不推薦大型電機用皮帶傳動?

文章出處:maituwangluo.com  |  發布時間:2020/12/29 17:17:21  |  瀏覽次數:342

為什(shen)么(me)不推薦(jian)大型電(dian)機用皮帶傳(chuan)動?

有(you)興趣的(de)話可以翻翻電機(ji)產品的(de)操(cao)作(zuo)維護說明書(shu)。大部分說明書(shu)對(dui)電機(ji)和(he)設備(bei)的(de)對(dui)接(jie)方式提出了具體要求,保證電機(ji)和(he)設備(bei)同(tong)軸,盡量(liang)減小(xiao)垂直于軸線的(de)軸上的(de)徑(jing)向力(li)。因此,對(dui)于電機(ji)傳動(dong),更建(jian)議使用聯軸器(qi),而(er)不(bu)是皮(pi)帶(dai)傳動(dong),特別是對(dui)于大功率電機(ji),皮(pi)帶(dai)傳動(dong)會由于皮(pi)帶(dai)過緊、皮(pi)帶(dai)輪直徑(jing)過大等因素造(zao)成不(bu)必要的(de)斷軸。


為了(le)避免電(dian)機(ji)(ji)軸斷裂的問題,電(dian)機(ji)(ji)制造(zao)商將控(kong)制電(dian)機(ji)(ji)軸的材料(liao)質量、加工(gong)(gong)工(gong)(gong)藝和設計,但(dan)電(dian)機(ji)(ji)用戶應與電(dian)機(ji)(ji)制造(zao)商溝(gou)通具體安裝。


如果同樣的問題發生(sheng)在同一個產品上,或者只發生在同一個客戶身上,我(wo)們有(you)必要(yao)對此類(lei)問題進(jin)行充分(fen)的分(fen)析(xi),供需雙(shuang)方可以通過深入的溝通解(jie)決實質性的問題。


如何選擇電機(ji)?


選擇(ze)電(dian)(dian)(dian)機(ji)(ji)作(zuo)為動(dong)(dong)力機(ji)(ji)時,主要(yao)是確定(ding)(ding)電(dian)(dian)(dian)機(ji)(ji)的(de)(de)類型(xing)和(he)規格(ge)。選擇(ze)電(dian)(dian)(dian)機(ji)(ji)的(de)(de)類型(xing)需要(yao)考慮工(gong)作(zuo)機(ji)(ji)的(de)(de)負(fu)載(zai)(zai)特性、生(sheng)產(chan)(chan)工(gong)藝要(yao)求、運行環境和(he)電(dian)(dian)(dian)網的(de)(de)供電(dian)(dian)(dian)條件。確定(ding)(ding)電(dian)(dian)(dian)機(ji)(ji)規格(ge)的(de)(de)主要(yao)原則是根據生(sheng)產(chan)(chan)工(gong)藝和(he)負(fu)載(zai)(zai)情況檢查電(dian)(dian)(dian)機(ji)(ji)的(de)(de)發熱、起動(dong)(dong)轉(zhuan)矩(ju)和(he)過(guo)載(zai)(zai)轉(zhuan)矩(ju)。如(ru)果生(sheng)產(chan)(chan)過(guo)程不需要(yao)調(diao)(diao)速(su)(su),首先考慮交(jiao)流電(dian)(dian)(dian)機(ji)(ji);如(ru)果負(fu)載(zai)(zai)穩定(ding)(ding),一般(ban)可(ke)選用(yong)(yong)鼠(shu)籠式(shi)異(yi)(yi)步電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji);如(ru)果機(ji)(ji)器需要(yao)在重(zhong)負(fu)載(zai)(zai)下啟動(dong)(dong),可(ke)以(yi)選擇(ze)鼠(shu)籠式(shi)異(yi)(yi)步電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)或高(gao)啟動(dong)(dong)轉(zhuan)矩(ju)的(de)(de)繞線式(shi)異(yi)(yi)步電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)。很多(duo)工(gong)作(zuo)機(ji)(ji)械(xie)需要(yao)調(diao)(diao)速(su)(su),有的(de)(de)只(zhi)需要(yao)電(dian)(dian)(dian)機(ji)(ji)進行幾級調(diao)(diao)速(su)(su),如(ru)機(ji)(ji)床(chuang)等。可(ke)以(yi)使用(yong)(yong)多(duo)速(su)(su)交(jiao)流異(yi)(yi)步電(dian)(dian)(dian)機(ji)(ji);如(ru)果對調(diao)(diao)速(su)(su)要(yao)求較(jiao)高(gao),應采(cai)用(yong)(yong)DC單獨勵(li)磁電(dian)(dian)(dian)機(ji)(ji)。


電機(ji)啟動模式


電(dian)機分(fen)為(wei)直(zhi)接(jie)起動(dong)(dong)和降壓起動(dong)(dong)。對(dui)于(yu)鼠籠式異(yi)步(bu)電(dian)動(dong)(dong)機,應(ying)首選直(zhi)接(jie)起動(dong)(dong)。但直(zhi)接(jie)起動(dong)(dong)時,起動(dong)(dong)電(dian)流通常(chang)達到額定電(dian)流的(de)4 ~ 7倍(bei),而起動(dong)(dong)轉(zhuan)矩僅為(wei)額定轉(zhuan)矩的(de)0.8 ~ 1.5倍(bei)。由于(yu)啟動(dong)(dong)電(dian)流大,需要考慮是否允許并網容量。


降(jiang)(jiang)壓(ya)(ya)起(qi)(qi)動(dong)(dong)有三(san)種(zhong)方(fang)法:電(dian)(dian)(dian)(dian)阻(zu)(zu)或(huo)電(dian)(dian)(dian)(dian)抗(kang)器(qi)降(jiang)(jiang)壓(ya)(ya):起(qi)(qi)動(dong)(dong)時(shi)在定(ding)(ding)子(zi)繞組中串(chuan)聯(lian)電(dian)(dian)(dian)(dian)阻(zu)(zu)或(huo)電(dian)(dian)(dian)(dian)抗(kang)器(qi),起(qi)(qi)動(dong)(dong)后(hou)短路(lu)。當起(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)(dian)流(liu)用這(zhe)種(zhong)方(fang)法減小(xiao)到1/K倍時(shi),起(qi)(qi)動(dong)(dong)轉矩(ju)(ju)減小(xiao)到1/K2倍。星(xing)三(san)角(jiao)降(jiang)(jiang)壓(ya)(ya):啟動(dong)(dong)時(shi)將(jiang)(jiang)定(ding)(ding)子(zi)繞組臨時(shi)接(jie)成星(xing)形(xing)(xing),啟動(dong)(dong)后(hou)再將(jiang)(jiang)定(ding)(ding)子(zi)繞組改為(wei)三(san)角(jiao)形(xing)(xing)。該方(fang)法僅(jin)適用于正常(chang)運行時(shi)定(ding)(ding)子(zi)繞組為(wei)三(san)角(jiao)形(xing)(xing)的電(dian)(dian)(dian)(dian)機(ji)(ji),可將(jiang)(jiang)電(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)流(liu)降(jiang)(jiang)低到直接(jie)起(qi)(qi)動(dong)(dong)的1/3,起(qi)(qi)動(dong)(dong)轉矩(ju)(ju)降(jiang)(jiang)低到1/3。自耦(ou)變壓(ya)(ya)器(qi)降(jiang)(jiang)壓(ya)(ya):啟動(dong)(dong)時(shi),通過自耦(ou)變壓(ya)(ya)器(qi)給電(dian)(dian)(dian)(dian)機(ji)(ji)供電(dian)(dian)(dian)(dian),使電(dian)(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)(dian)壓(ya)(ya)降(jiang)(jiang)至額定(ding)(ding)電(dian)(dian)(dian)(dian)壓(ya)(ya)的1/K。啟動(dong)(dong)后(hou),自耦(ou)變壓(ya)(ya)器(qi)切斷,電(dian)(dian)(dian)(dian)機(ji)(ji)直接(jie)接(jie)入電(dian)(dian)(dian)(dian)網(wang)。用這(zhe)種(zhong)方(fang)法起(qi)(qi)動(dong)(dong)時(shi),直接(jie)起(qi)(qi)動(dong)(dong)時(shi)電(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)流(liu)和轉矩(ju)(ju)會降(jiang)(jiang)低到1/K2。


降(jiang)壓起(qi)動(dong)只適合輕載起(qi)動(dong)。如果起(qi)動(dong)電(dian)(dian)(dian)流(liu)要限(xian)制(zhi),起(qi)動(dong)轉矩要大(da),則應采用繞線式異步電(dian)(dian)(dian)動(dong)機(ji),起(qi)動(dong)電(dian)(dian)(dian)阻(zu)(zu)應串聯在轉子(zi)繞組電(dian)(dian)(dian)路中,起(qi)動(dong)過程中應逐步切斷(duan)電(dian)(dian)(dian)阻(zu)(zu)。為(wei)了簡化起(qi)動(dong)設備,改善起(qi)動(dong)特性,常采用頻敏變(bian)阻(zu)(zu)器代替起(qi)動(dong)變(bian)阻(zu)(zu)器。對于DC電(dian)(dian)(dian)機(ji),一般不允許直接(jie)起(qi)動(dong),除非是(shi)小(xiao)容(rong)量的。為(wei)了限(xian)制(zhi)電(dian)(dian)(dian)流(liu),起(qi)動(dong)電(dian)(dian)(dian)阻(zu)(zu)必(bi)須連接(jie)在電(dian)(dian)(dian)樞電(dian)(dian)(dian)路中。

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