步進電機驅動器選型
步進電(dian)機的轉速(su)與脈(mo)沖(chong)信(xin)號的頻率成正比,操(cao)控步進脈(mo)沖(chong)信(xin)號的頻率,能夠對(dui)電(dian)機準(zhun)確(que)調速(su);操(cao)控步進脈(mo)沖(chong)的個(ge)數,能夠對(dui)電(dian)機準(zhun)確(que)定(ding)位。因(yin)而(er)典型的步進電(dian)機驅(qu)動器操(cao)控系(xi)統首要由(you)三部分組(zu)成:
1、步(bu)進操控(kong)器:人機接口、運(yun)動(dong)規劃(hua)、I/O操控(kong)。
2、驅動器:脈沖分配、電流擴(kuo)大(da)。
3、步進電機(ji):驅動負(fu)載。
驅動(dong)器的(de)(de)(de)(de)細(xi)分:步進電(dian)機(ji)(ji)驅動(dong)器的(de)(de)(de)(de)作業形(xing)式有(you)整步、半步、細(xi)分,首要差異在于電(dian)機(ji)(ji)線圈(quan)電(dian)流的(de)(de)(de)(de)操控精度。一般步進電(dian)機(ji)(ji)都(dou)有(you)低(di)頻振蕩的(de)(de)(de)(de)特點,通過細(xi)分設置能夠改進電(dian)機(ji)(ji)低(di)速運轉的(de)(de)(de)(de)平穩性。
驅動器的(de)供電(dian)(dian)(dian)電(dian)(dian)(dian)壓(ya):驅動器的(de)輸(shu)入(ru)電(dian)(dian)(dian)壓(ya)的(de)凹凸決議電(dian)(dian)(dian)機(ji)的(de)高速功(gong)能(neng)。供電(dian)(dian)(dian)電(dian)(dian)(dian)壓(ya)越(yue)(yue)高,電(dian)(dian)(dian)機(ji)高速時力矩越(yue)(yue)大(da),越(yue)(yue)能(neng)防(fang)止高速進失步。但電(dian)(dian)(dian)壓(ya)過高會導致(zhi)(zhi)驅動器過壓(ya)維(wei)護,電(dian)(dian)(dian)機(ji)發熱較多,可能(neng)導致(zhi)(zhi)驅動器損壞(huai)。在高壓(ya)下作業時,電(dian)(dian)(dian)機(ji)低(di)速運動的(de)振蕩會大(da)一(yi)些。
驅(qu)動(dong)器(qi)的(de)電(dian)流(liu):電(dian)流(liu)是判別驅(qu)動(dong)器(qi)驅(qu)動(dong)能(neng)力(li)巨細的(de)根(gen)據(ju),一般驅(qu)動(dong)器(qi)最(zui)大額(e)定(ding)電(dian)流(liu)不能(neng)大于電(dian)機的(de)額(e)定(ding)電(dian)流(liu)。驅(qu)動(dong)器(qi)輸(shu)(shu)出(chu)電(dian)流(liu)設(she)(she)定(ding)決議(yi)電(dian)機的(de)力(li)矩(ju),電(dian)流(liu)設(she)(she)定(ding)值越大時,電(dian)機輸(shu)(shu)出(chu)力(li)矩(ju)越大,但電(dian)流(liu)設(she)(she)定(ding)過(guo)大時電(dian)機和驅(qu)動(dong)器(qi)的(de)發熱也(ye)比較嚴重。一般的(de)設(she)(she)定(ding)方法選用(yong)步進電(dian)機額(e)定(ding)電(dian)流(liu)值作為(wei)參閱(yue)、但實(shi)踐(jian)使用(yong)中的(de)最(zui)佳(jia)值應(ying)在(zai)些基礎上調整(zheng)。