有時(shi)候我們(men)容(rong)易對(dui)(dui)電磁制動(dong),再生制動(dong),動(dong)態制動(dong)的作(zuo)用(yong)混(hun)淆,選擇了錯誤的配件。以下對(dui)(dui)這幾個概念加以澄清。
動(dong)態(tai)制(zhi)動(dong)器由動(dong)態(tai)制(zhi)動(dong)電阻組成,在(zai)故障、急停、電源斷電時通(tong)過(guo)能(neng)耗制(zhi)動(dong)縮(suo)短伺服(fu)電機的(de)機械(xie)進給(gei)距離.
再生(sheng)制動(dong)是指伺(si)服電機在減速或停車時將(jiang)制動(dong)產(chan)生(sheng)的能量通(tong)過逆變回路(lu)反饋(kui)到直(zhi)流母線,經阻容回路(lu)吸(xi)收(shou).
電磁制動(dong)是通過(guo)機械(xie)裝(zhuang)置鎖住電機的(de)軸(zhou).
三者的區別
(1)再生制動(dong)必須在伺服器正常工作(zuo)時才起作(zuo)用,在故障,急停(ting),電(dian)源(yuan)斷電(dian)時等情況(kuang)下無法制動(dong)電(dian)機.動(dong)態(tai)制動(dong)器和電(dian)磁制動(dong)工作(zuo)時不需電(dian)源(yuan).
(2)再生制(zhi)動的(de)工作是系統自動進行,而動態(tai)制(zhi)動器(qi)和電磁制(zhi)動的(de)工作需外部(bu)繼電器(qi)控制(zhi).
(3)電(dian)磁(ci)制動(dong)(dong)一般在SVOFF后啟(qi)動(dong)(dong),否則(ze)可能(neng)(neng)造成放大器(qi)過載.動(dong)(dong)態(tai)制動(dong)(dong)器(qi)一般在SVOFF或主回路斷電(dian)后啟(qi)動(dong)(dong),否則(ze)可能(neng)(neng)造成動(dong)(dong)態(tai)制動(dong)(dong)電(dian)阻過熱.
選擇配件的注意事項
(1)有些系(xi)統如傳送裝置(zhi),升降(jiang)裝置(zhi)等(deng)要(yao)(yao)求伺(si)服電(dian)機(ji)(ji)能盡(jin)快停車.而在故障,急(ji)停,電(dian)源斷電(dian)時伺(si)服器沒有再生制動無法對(dui)電(dian)機(ji)(ji)減(jian)速.同時系(xi)統的(de)機(ji)(ji)械慣(guan)量又較大(da),這時對(dui)動態制動器的(de)選(xuan)擇要(yao)(yao)依(yi)據(ju)負載的(de)輕(qing)重,電(dian)機(ji)(ji)的(de)工作速度等(deng).
(2)有些系統要(yao)維持(chi)機械裝置(zhi)的靜止位(wei)置(zhi)需電(dian)機提供較(jiao)大的輸出轉矩且停止的時間較(jiao)長,如果(guo)使用伺(si)服的自鎖功能往往會造成電(dian)機過(guo)熱或放大器過(guo)載.這種情況就要(yao)選擇帶(dai)電(dian)磁制動的電(dian)機.
(3)有的(de)(de)伺服器有內置的(de)(de)再(zai)(zai)生制(zhi)(zhi)(zhi)動(dong)(dong)單元,但當(dang)再(zai)(zai)生制(zhi)(zhi)(zhi)動(dong)(dong)較(jiao)頻繁時可能引起直流母線(xian)電(dian)(dian)壓過高,這(zhe)時需(xu)另配(pei)再(zai)(zai)生制(zhi)(zhi)(zhi)動(dong)(dong)電(dian)(dian)阻.再(zai)(zai)生制(zhi)(zhi)(zhi)動(dong)(dong)電(dian)(dian)阻是(shi)否需(xu)要另配(pei),配(pei)多大(da)的(de)(de)再(zai)(zai)生制(zhi)(zhi)(zhi)動(dong)(dong)電(dian)(dian)阻可參照相應(ying)樣(yang)(yang)本的(de)(de)使用說明.需(xu)要注(zhu)意的(de)(de)是(shi)一般樣(yang)(yang)本列(lie)表上的(de)(de)制(zhi)(zhi)(zhi)動(dong)(dong)次數是(shi)電(dian)(dian)機(ji)在空載時的(de)(de)數據.實際(ji)選型中要先根據系統(tong)的(de)(de)負(fu)載慣(guan)量(liang)和樣(yang)(yang)本上的(de)(de)電(dian)(dian)機(ji)慣(guan)量(liang),算出慣(guan)量(liang)比.再(zai)(zai)以樣(yang)(yang)本列(lie)表上的(de)(de)制(zhi)(zhi)(zhi)動(dong)(dong)次數除以(慣(guan)量(liang)比+1).這(zhe)樣(yang)(yang)得到(dao)的(de)(de)數據才是(shi)允許的(de)(de)制(zhi)(zhi)(zhi)動(dong)(dong)次數。
