直線電機直接驅動技術的優勢體現
發布時間:2016/7/1 9:27:00 瀏覽次數:2929直線電機是(shi)將傳統(tong)圓筒型電(dian)(dian)機(ji)的(de)(de)(de)初級(ji)(ji)(ji)(ji)(ji)(ji)展(zhan)開(kai)拉直(zhi)(zhi)(zhi),變(bian)(bian)初級(ji)(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)封閉磁(ci)(ci)(ci)場(chang)(chang)為開(kai)放磁(ci)(ci)(ci)場(chang)(chang),而旋(xuan)(xuan)轉電(dian)(dian)機(ji)的(de)(de)(de)定子部分變(bian)(bian)為直(zhi)(zhi)(zhi)線(xian)(xian)(xian)電(dian)(dian)機(ji)的(de)(de)(de)初級(ji)(ji)(ji)(ji)(ji)(ji),旋(xuan)(xuan)轉電(dian)(dian)機(ji)的(de)(de)(de)轉子部分變(bian)(bian)為直(zhi)(zhi)(zhi)線(xian)(xian)(xian)電(dian)(dian)機(ji)的(de)(de)(de)次(ci)級(ji)(ji)(ji)(ji)(ji)(ji)。在(zai)電(dian)(dian)機(ji)的(de)(de)(de)三(san)相(xiang)繞(rao)組中通(tong)入三(san)相(xiang)對稱(cheng)正(zheng)(zheng)弦電(dian)(dian)流后,在(zai)初級(ji)(ji)(ji)(ji)(ji)(ji)和次(ci)級(ji)(ji)(ji)(ji)(ji)(ji)間(jian)產生氣(qi)(qi)(qi)隙(xi)(xi)(xi)(xi)磁(ci)(ci)(ci)場(chang)(chang),氣(qi)(qi)(qi)隙(xi)(xi)(xi)(xi)磁(ci)(ci)(ci)場(chang)(chang)的(de)(de)(de)分布(bu)情況與旋(xuan)(xuan)轉電(dian)(dian)機(ji)相(xiang)似,沿(yan)(yan)展(zhan)開(kai)的(de)(de)(de)直(zhi)(zhi)(zhi)線(xian)(xian)(xian)方(fang)向呈正(zheng)(zheng)弦分布(bu)。當三(san)相(xiang)電(dian)(dian)流隨時(shi)問變(bian)(bian)化時(shi),使(shi)氣(qi)(qi)(qi)隙(xi)(xi)(xi)(xi)磁(ci)(ci)(ci)場(chang)(chang)按(an)定向相(xiang)序(xu)沿(yan)(yan)直(zhi)(zhi)(zhi)線(xian)(xian)(xian)移動,這(zhe)個(ge)氣(qi)(qi)(qi)隙(xi)(xi)(xi)(xi)磁(ci)(ci)(ci)場(chang)(chang)稱(cheng)為行波(bo)磁(ci)(ci)(ci)場(chang)(chang)。當次(ci)級(ji)(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)感應電(dian)(dian)流和氣(qi)(qi)(qi)隙(xi)(xi)(xi)(xi)磁(ci)(ci)(ci)場(chang)(chang)相(xiang)互(hu)作(zuo)用便產生了電(dian)(dian)磁(ci)(ci)(ci)推力(li),如果初級(ji)(ji)(ji)(ji)(ji)(ji)是(shi)固定不動的(de)(de)(de),次(ci)級(ji)(ji)(ji)(ji)(ji)(ji)就能(neng)沿(yan)(yan)著行波(bo)磁(ci)(ci)(ci)場(chang)(chang)運(yun)動的(de)(de)(de)方(fang)向做直(zhi)(zhi)(zhi)線(xian)(xian)(xian)運(yun)動。即(ji)可實現高(gao)速(su)機(ji)床(chuang)的(de)(de)(de)直(zhi)(zhi)(zhi)線(xian)(xian)(xian)電(dian)(dian)機(ji)直(zhi)(zhi)(zhi)接(jie)(jie)驅動的(de)(de)(de)進(jin)給(gei)方(fang)式(shi),把直(zhi)(zhi)(zhi)線(xian)(xian)(xian)電(dian)(dian)機(ji)的(de)(de)(de)初級(ji)(ji)(ji)(ji)(ji)(ji)和次(ci)級(ji)(ji)(ji)(ji)(ji)(ji)分別直(zhi)(zhi)(zhi)接(jie)(jie)安裝在(zai)高(gao)速(su)機(ji)床(chuang)的(de)(de)(de)工(gong)作(zuo)臺與床(chuang)身上。由(you)于這(zhe)種進(jin)給(gei)傳動方(fang)式(shi)的(de)(de)(de)傳動鏈縮短為0,被稱(cheng)為機(ji)床(chuang)進(jin)給(gei)系統(tong)的(de)(de)(de)“零傳動”。
直(zhi)線電機(ji)直(zhi)接驅動技術(shu)與“旋(xuan)轉伺(si)服電機(ji)+滾珠絲杠”傳動方式相比,具(ju)有(you)以下4大優(you)勢:
1、高速(su)度,目前最大進(jin)給速(su)度可達100~200m/min;
2、高加速度,可高達(da)2g~10g;
3、定(ding)位(wei)精(jing)度(du)高(gao),由于只(zhi)能(neng)采用(yong)閉(bi)環控(kong)制(zhi),其理論定(ding)位(wei)精(jing)度(du)可以為(wei)0,但(dan)由于存在檢(jian)測元(yuan)件(jian)安裝、測量誤差,實際定(ding)位(wei)精(jing)度(du)不可能(neng)為(wei)0。最高(gao)定(ding)位(wei)精(jing)度(du)可達0.1~0.01m;
4、行(xing)程不受限制,由于直線電機(ji)的次級(定子)可以一(yi)段一(yi)段地鋪在機(ji)床床身(shen)上(shang)(shang),不論(lun)有多(duo)遠,對系統的剛(gang)度不會(hui)產生影響。例如,美國CincinnatiMilacron公司為(wei)航空工(gong)(gong)業(ye)生產了一(yi)臺HyperMach大(da)型高速(su)加(jia)工(gong)(gong)中心(xin),主軸(zhou)轉速(su)為(wei)60000r/min,主電機(ji)功率(lv)為(wei)80kW。直線進給采(cai)用了直線電機(ji),其(qi)軸(zhou)行(xing)程長達(da)46m,工(gong)(gong)作臺快速(su)行(xing)程為(wei)100m/min,加(jia)速(su)度達(da)2g。在這種機(ji)床上(shang)(shang)加(jia)工(gong)(gong)一(yi)個大(da)型薄壁飛(fei)機(ji)零(ling)件(jian)(jian)只(zhi)需30min;而同樣的零(ling)件(jian)(jian)在一(yi)般高速(su)銑(xian)床上(shang)(shang)加(jia)工(gong)(gong),費時3h;在普通數控銑(xian)床上(shang)(shang)加(jia)工(gong)(gong),則需8h,優(you)勢(shi)相當明顯(xian)。
文章標題:直線電機直接驅動技術的優勢體現
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