西門子伺(si)服(fu)電機是指在伺(si)服(fu)系統中(zhong)控制機械元(yuan)件運轉的(de)發動機,是一種補助(zhu)馬達間接變速裝(zhuang)置。
伺服電(dian)機(ji)(ji)可(ke)使控(kong)制(zhi)速度(du),位置(zhi)精度(du)非常準(zhun)確,可(ke)以(yi)將電(dian)壓信號轉(zhuan)(zhuan)(zhuan)化為轉(zhuan)(zhuan)(zhuan)矩和轉(zhuan)(zhuan)(zhuan)速以(yi)驅動控(kong)制(zhi)對象。伺服電(dian)機(ji)(ji)轉(zhuan)(zhuan)(zhuan)子轉(zhuan)(zhuan)(zhuan)速受輸(shu)入信號控(kong)制(zhi),并能快速反應,在(zai)自動控(kong)制(zhi)系統(tong)中,用作執行(xing)元件,且具有機(ji)(ji)電(dian)時間常數小(xiao)、線性度(du)高、始動電(dian)壓等特性,可(ke)把所收到的電(dian)信號轉(zhuan)(zhuan)(zhuan)換成電(dian)動機(ji)(ji)軸上的角位移或角速度(du)輸(shu)出。分為直流和交流伺服電(dian)動機(ji)(ji)兩大類(lei),其主要特點是,當信號電(dian)壓為零(ling)時無自轉(zhuan)(zhuan)(zhuan)現象,轉(zhuan)(zhuan)(zhuan)速隨(sui)著(zhu)轉(zhuan)(zhuan)(zhuan)矩的增加而勻速下(xia)降。
在西門子伺服(fu)電機維(wei)修時需要做什(shen)么呢?
(1)有些系(xi)統如(ru)傳送裝(zhuang)(zhuang)置,升降裝(zhuang)(zhuang)置等(deng)要求伺服電機能盡快停車(che).而在故障,急停,電源斷電時伺服器沒有再生制動(dong)無法對電機減速(su).同時系(xi)統的機械慣(guan)量又較大,這(zhe)時對動(dong)態制動(dong)器的選(xuan)擇(ze)要依(yi)據負載的輕重,電機的工(gong)作(zuo)速(su)度(du)等(deng).
(2)有些系(xi)統(tong)要(yao)維持機(ji)械裝置的靜止位(wei)置需電(dian)機(ji)提供(gong)較(jiao)(jiao)大的輸出轉矩且停止的時間較(jiao)(jiao)長(chang),如果使用伺服的自鎖(suo)功能往往會造成電(dian)機(ji)過熱或放大器過載.這種情況就要(yao)選擇(ze)帶電(dian)磁制動的電(dian)機(ji).
(3)有(you)的伺服電(dian)機有(you)內置的再(zai)生制(zhi)(zhi)動(dong)(dong)(dong)單元,但(dan)當再(zai)生制(zhi)(zhi)動(dong)(dong)(dong)較頻繁(fan)時(shi)可能引(yin)起直流母線電(dian)壓過高,這時(shi)需(xu)(xu)另(ling)配(pei)再(zai)生制(zhi)(zhi)動(dong)(dong)(dong)電(dian)阻(zu).再(zai)生制(zhi)(zhi)動(dong)(dong)(dong)電(dian)阻(zu)是(shi)(shi)否(fou)需(xu)(xu)要(yao)(yao)另(ling)配(pei),配(pei)多大的再(zai)生制(zhi)(zhi)動(dong)(dong)(dong)電(dian)阻(zu)可參照相應樣(yang)本的使用說明.需(xu)(xu)要(yao)(yao)注意的是(shi)(shi)一(yi)般樣(yang)本列表(biao)上(shang)的制(zhi)(zhi)動(dong)(dong)(dong)次(ci)數是(shi)(shi)電(dian)機在空載時(shi)的數據.實(shi)際(ji)選型(xing)中要(yao)(yao)先根(gen)據系統的負載慣(guan)量(liang)和(he)樣(yang)本上(shang)的電(dian)機慣(guan)量(liang),算出慣(guan)量(liang)比(bi)(bi).再(zai)以樣(yang)本列表(biao)上(shang)的制(zhi)(zhi)動(dong)(dong)(dong)次(ci)數除(chu)以(慣(guan)量(liang)比(bi)(bi)+1).這樣(yang)擁有(you)的數據才(cai)是(shi)(shi)允許的制(zhi)(zhi)動(dong)(dong)(dong)次(ci)數.
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