相信多數的(de)朋友都知道(dao)，直流(liu)(liu)無刷電(dian)(dian)(dian)(dian)機(ji)的(de)驅動(dong)(dong)模塊主(zhu)要(yao)(yao)是(shi)可以控制電(dian)(dian)(dian)(dian)機(ji)的(de)運行：調速、運行、停止、步進、勻速等(deng)操作，而(er)直流(liu)(liu)無刷電(dian)(dian)(dian)(dian)機(ji)的(de)啟動(dong)(dong)模式有二種(zhong)模式，一(yi)種(zhong)為利用(yong)驅動(dong)(dong)電(dian)(dian)(dian)(dian)源(yuan)的(de)緩啟動(dong)(dong)來啟動(dong)(dong)直流(liu)(liu)電(dian)(dian)(dian)(dian)機(ji)，另(ling)一(yi)方式為先啟動(dong)(dong)電(dian)(dian)(dian)(dian)源(yuan)，電(dian)(dian)(dian)(dian)源(yuan)的(de)電(dian)(dian)(dian)(dian)壓電(dian)(dian)(dian)(dian)流(liu)(liu)都工作正常了。那么在直流(liu)(liu)電(dian)(dian)(dian)(dian)機(ji)驅動(dong)(dong)電(dian)(dian)(dian)(dian)路的(de)設(she)計中，要(yao)(yao)考(kao)慮(lv)什么呢？下(xia)面由(you)博英特技術人員告(gao)訴(su)大家：
1、功能(neng)：電(dian)機(ji)是單(dan)向還是雙向轉(zhuan)動？需不(bu)需要(yao)(yao)調(diao)(diao)速(su)？對(dui)于單(dan)向的(de)電(dian)機(ji)驅動，只要(yao)(yao)用一個大功率三極(ji)管(guan)或場(chang)效應管(guan)或繼(ji)(ji)電(dian)器直接帶(dai)動電(dian)機(ji)即(ji)可，當電(dian)機(ji)需要(yao)(yao)雙向轉(zhuan)動時，可以使(shi)用由4個功率元件組成的(de)H橋電(dian)路或者使(shi)用一個雙刀雙擲的(de)繼(ji)(ji)電(dian)器。如果(guo)不(bu)需要(yao)(yao)調(diao)(diao)速(su)，只要(yao)(yao)使(shi)用繼(ji)(ji)電(dian)器即(ji)可；但如果(guo)需要(yao)(yao)調(diao)(diao)速(su)，可以使(shi)用三極(ji)管(guan)，場(chang)效應管(guan)等開關元件實(shi)現PWM（脈沖(chong)寬度調(diao)(diao)制）調(diao)(diao)速(su)。
2、性能：對于PWM調速的電機(ji)驅動電路(lu)，主要有以下性能指標：
(1)輸出電(dian)(dian)流和電(dian)(dian)壓范圍，決定著電(dian)(dian)路能驅動多大(da)功率(lv)的(de)電(dian)(dian)機；
(2)效(xiao)(xiao)率(lv)，高的效(xiao)(xiao)率(lv)不僅(jin)意味著(zhu)節省電源，也(ye)會(hui)減少驅動電路(lu)的發熱；
(3)對控(kong)(kong)制(zhi)輸入(ru)(ru)端的影響(xiang)，功率電路(lu)對其輸入(ru)(ru)端應有良好的信號(hao)隔離(li)，防止有高電壓大電流進(jin)入(ru)(ru)主控(kong)(kong)電路(lu)；
(4)可(ke)靠性(xing)，電機驅動電路應該(gai)盡(jin)可(ke)能做到，無論加上何種控制(zhi)信(xin)號(hao)，何種無源(yuan)負(fu)載，電路都是(shi)安全的；
(5)對電(dian)(dian)(dian)(dian)源(yuan)的(de)影響，共態導通(tong)可以引起(qi)電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓的(de)瞬間(jian)下(xia)降造(zao)成高(gao)頻電(dian)(dian)(dian)(dian)源(yuan)污染(ran)，大的(de)電(dian)(dian)(dian)(dian)流(liu)可能導致地線電(dian)(dian)(dian)(dian)位浮動。
以上今天(tian)要與大家分享的知識了，直流無刷電機(ji)(ji)驅(qu)動的正(zheng)弦波控(kong)制方式，與傳統的方波控(kong)制相(xiang)比，電機(ji)(ji)相(xiang)電流為(wei)正(zheng)弦，且(qie)連續變化，無換相(xiang)電流突變，因(yin)此電機(ji)(ji)運行(xing)噪聲低。
