步進電機驅動(dong)器是專門用(yong)于驅動(dong)步(bu)(bu)進電(dian)(dian)機的(de)電(dian)(dian)子設備,它把控(kong)制系統發出的(de)脈沖信號(hao)轉化為步(bu)(bu)進電(dian)(dian)機的(de)角位(wei)移,或者說控(kong)制系統每發一(yi)個脈沖信號(hao),通(tong)過驅動(dong)器就使步(bu)(bu)進電(dian)(dian)機旋轉一(yi)步(bu)(bu)距角。控(kong)制步(bu)(bu)進脈沖信號(hao)的(de)頻率和脈沖個數,就可以對(dui)電(dian)(dian)機進行精確調速和定位(wei)。
步進電機由(you)于(yu)使用不當、環境潮濕(shi)、滲水(shui)及(ji)灰塵等因素,會(hui)引起步(bu)進(jin)(jin)電(dian)機(ji)(ji)及(ji)驅動(dong)(dong)(dong)器(qi)短路甚至燒毀。由(you)此,非常(chang)必(bi)要為步(bu)進(jin)(jin)電(dian)機(ji)(ji)及(ji)驅動(dong)(dong)(dong)器(qi)設(she)計一(yi)(yi)個完善的保護電(dian)路。對于(yu)高壓步(bu)進(jin)(jin)電(dian)機(ji)(ji)及(ji)驅動(dong)(dong)(dong)器(qi),在各種異常(chang)條(tiao)件下的保護還存在一(yi)(yi)些特(te)殊的問題需(xu)要特(te)別(bie)考(kao)慮。
高壓(ya)大電(dian)(dian)(dian)流步(bu)(bu)進電(dian)(dian)(dian)機驅(qu)動的(de)(de)異常(chang)工作情況分(fen)析:高壓(ya)大電(dian)(dian)(dian)流兩相(xiang)混(hun)合式步(bu)(bu)進電(dian)(dian)(dian)機的(de)(de)驅(qu)動通常(chang)采用H橋電(dian)(dian)(dian)路。高壓(ya)電(dian)(dian)(dian)源VH經過(guo)IGBT管Q1~Q8的(de)(de)驅(qu)動電(dian)(dian)(dian)機繞組LA和LB,RH為(wei)上(shang)端電(dian)(dian)(dian)流取(qu)樣電(dian)(dian)(dian)阻,R1和R2為(wei)下端電(dian)(dian)(dian)流取(qu)樣電(dian)(dian)(dian)阻。
驅動(dong)電(dian)路(lu)異常(chang)工(gong)作(zuo)情況(kuang)(kuang)分析:在驅動(dong)器的(de)使用過程中, 錯相(xiang)和過流是(shi)步進(jin)電(dian)機(ji)驅動(dong)器最常(chang)見的(de)兩種異常(chang)工(gong)作(zuo)情況(kuang)(kuang)。錯相(xiang)是(shi)由(you)于錯接(jie)繞(rao)組造成(cheng)步進(jin)電(dian)機(ji)同相(xiang)繞(rao)組正負極(ji)短(duan)(duan)路(lu),相(xiang)間(jian)相(xiang)互短(duan)(duan)路(lu),繞(rao)組對地短(duan)(duan)路(lu)或繞(rao)組對高壓短(duan)(duan)路(lu)等。
由于電(dian)機進水等(deng)原因(yin)也會引起(qi)(qi)電(dian)機相繞組(zu)對地或對高壓短(duan)路(lu) (同(tong)相繞組(zu)A+與(yu)A-或相間繞組(zu)A+與(yu)B+,A+與(yu)B-短(duan)路(lu)等(deng))。此(ci)時,流(liu)過(guo)驅動(dong)(dong)器的(de)電(dian)流(liu)會在(zai)瞬間變(bian)得(de)非常(chang)(chang)大,H橋溫度迅速上升,從(cong)而(er)造成電(dian)機無法正常(chang)(chang)運轉甚(shen)至(zhi)會燒(shao)壞(huai)電(dian)機及驅動(dong)(dong)器以致引起(qi)(qi)更為嚴(yan)重火災等(deng)后果。
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