步進電機驅動器選型
步(bu)進電(dian)機(ji)的(de)轉速與(yu)脈(mo)沖信(xin)號(hao)的(de)頻率(lv)成正比(bi),操(cao)控(kong)步(bu)進脈(mo)沖信(xin)號(hao)的(de)頻率(lv),能(neng)(neng)夠(gou)對電(dian)機(ji)準確(que)調速;操(cao)控(kong)步(bu)進脈(mo)沖的(de)個數,能(neng)(neng)夠(gou)對電(dian)機(ji)準確(que)定位。因而典(dian)型的(de)步(bu)進電(dian)機(ji)驅(qu)動器操(cao)控(kong)系統首要由三部分組成:
1、步進(jin)操控器:人機接口、運動規劃、I/O操控。
2、驅動器:脈沖分配(pei)、電流擴大。
3、步進電機:驅動負載。
驅動(dong)器(qi)的細分(fen):步(bu)(bu)進(jin)電(dian)(dian)(dian)機驅動(dong)器(qi)的作業形式有(you)整步(bu)(bu)、半步(bu)(bu)、細分(fen),首要(yao)差(cha)異在于電(dian)(dian)(dian)機線圈電(dian)(dian)(dian)流的操控精度(du)。一般步(bu)(bu)進(jin)電(dian)(dian)(dian)機都有(you)低(di)頻(pin)振蕩的特(te)點,通過(guo)細分(fen)設(she)置能夠改進(jin)電(dian)(dian)(dian)機低(di)速運轉(zhuan)的平穩(wen)性(xing)。
驅動(dong)(dong)器的(de)供(gong)(gong)電(dian)電(dian)壓(ya)(ya)(ya):驅動(dong)(dong)器的(de)輸(shu)入電(dian)壓(ya)(ya)(ya)的(de)凹凸決(jue)議電(dian)機(ji)的(de)高(gao)(gao)(gao)速功能(neng)。供(gong)(gong)電(dian)電(dian)壓(ya)(ya)(ya)越高(gao)(gao)(gao),電(dian)機(ji)高(gao)(gao)(gao)速時(shi)力矩越大(da),越能(neng)防止高(gao)(gao)(gao)速進(jin)失步。但電(dian)壓(ya)(ya)(ya)過高(gao)(gao)(gao)會導致驅動(dong)(dong)器過壓(ya)(ya)(ya)維護,電(dian)機(ji)發熱較多,可能(neng)導致驅動(dong)(dong)器損壞。在高(gao)(gao)(gao)壓(ya)(ya)(ya)下作(zuo)業時(shi),電(dian)機(ji)低速運動(dong)(dong)的(de)振蕩會大(da)一些。
驅(qu)動(dong)器的(de)電(dian)(dian)(dian)流(liu)(liu):電(dian)(dian)(dian)流(liu)(liu)是判別驅(qu)動(dong)器驅(qu)動(dong)能力巨細的(de)根據,一般驅(qu)動(dong)器最(zui)大額(e)定(ding)電(dian)(dian)(dian)流(liu)(liu)不能大于電(dian)(dian)(dian)機的(de)額(e)定(ding)電(dian)(dian)(dian)流(liu)(liu)。驅(qu)動(dong)器輸出(chu)電(dian)(dian)(dian)流(liu)(liu)設(she)定(ding)決(jue)議電(dian)(dian)(dian)機的(de)力矩,電(dian)(dian)(dian)流(liu)(liu)設(she)定(ding)值越大時,電(dian)(dian)(dian)機輸出(chu)力矩越大,但電(dian)(dian)(dian)流(liu)(liu)設(she)定(ding)過大時電(dian)(dian)(dian)機和(he)驅(qu)動(dong)器的(de)發熱也(ye)比(bi)較(jiao)嚴重。一般的(de)設(she)定(ding)方(fang)法選用步進電(dian)(dian)(dian)機額(e)定(ding)電(dian)(dian)(dian)流(liu)(liu)值作為參閱、但實踐使(shi)用中的(de)最(zui)佳值應在些基礎上調整。