兩相和五相的混合式步進(jìn)電機(jī)的應(yīng)用場(chǎng)合有何不同?
一般來說,兩相步進(jìn)電機(jī)步距角大,高速特性好,但是存在步進(jìn)電機(jī)低速振動(dòng)區(qū)。而五相步進(jìn)電機(jī)步距角小,低速運(yùn)行平穩(wěn)。
所以,在對(duì)步進(jìn)電機(jī)的運(yùn)轉(zhuǎn)精度要求較高 ,且主要在中低速段(一般低于600轉(zhuǎn)/分) 的場(chǎng)合應(yīng)選用五相步進(jìn)電機(jī);
反之,若追求步進(jìn)電機(jī)的高速性能,對(duì)精度及平穩(wěn)性無太多要求的場(chǎng)合應(yīng)選用成本較低的兩相步進(jìn)電機(jī)。
另外,五相步進(jìn)電機(jī)的力矩通常在2NM以上,對(duì)小力矩的應(yīng)用,一般采用兩相步進(jìn)電機(jī),而低速平穩(wěn)性的問題可以通過采用細(xì)分步進(jìn)電機(jī)驅(qū)動(dòng)器的方式解決。
步進(jìn)電機(jī)為什么要配步進(jìn)電機(jī)驅(qū)動(dòng)器才能工作?
步進(jìn)電機(jī)作為一種控制精密位移及大范圍調(diào)速專用的電機(jī), 步進(jìn)電機(jī)的旋轉(zhuǎn)是以自身固有的步進(jìn)電機(jī)步距角(轉(zhuǎn)子與定子的機(jī)械結(jié)構(gòu)所決定)一步一步運(yùn)行的, 其特點(diǎn)是步進(jìn)電機(jī)每旋轉(zhuǎn)一步,步進(jìn)電機(jī)步距角始終不變,能夠保持精密準(zhǔn)確的位置。
所以無論旋轉(zhuǎn)多少次,始終沒有積累誤差。由于控制方法簡單,成本低廉,廣泛應(yīng)用于各種開環(huán)控制。
步進(jìn)電機(jī)的運(yùn)行需要有脈沖分配的功率型電子裝置進(jìn)行驅(qū)動(dòng), 這就是步進(jìn)電機(jī)驅(qū)動(dòng)器。
步進(jìn)電機(jī)驅(qū)動(dòng)器接收步進(jìn)電控制系統(tǒng)發(fā)出的脈沖信號(hào),按照步進(jìn)電機(jī)的結(jié)構(gòu)特點(diǎn),順序分配脈沖,實(shí)現(xiàn)控制步進(jìn)電機(jī)角位移、步進(jìn)電機(jī)旋轉(zhuǎn)速度、步進(jìn)電機(jī)旋轉(zhuǎn)方向、步進(jìn)電機(jī)制動(dòng)加載狀態(tài)、步進(jìn)電機(jī)自由狀態(tài)。步進(jìn)電控制系統(tǒng)每發(fā)一個(gè)脈沖信號(hào), 通過步進(jìn)電機(jī)驅(qū)動(dòng)器就能夠驅(qū)動(dòng)步進(jìn)電機(jī)旋轉(zhuǎn)一個(gè)步距角。
步進(jìn)電機(jī)的轉(zhuǎn)速與脈沖信號(hào)的頻率成正比。
步進(jìn)電機(jī)角位移量與脈沖個(gè)數(shù)相關(guān)。步進(jìn)電機(jī)停止旋轉(zhuǎn)時(shí),能夠產(chǎn)生兩種狀態(tài):制動(dòng)加載能夠產(chǎn)生最大或部分保持轉(zhuǎn)矩(通常稱為剎車保持,無需電磁制動(dòng)或機(jī)械制動(dòng))及轉(zhuǎn)子處于自由狀態(tài)(能夠被外部推力帶動(dòng)輕松旋轉(zhuǎn))。
步進(jìn)電機(jī)驅(qū)動(dòng)器,必須與步進(jìn)電機(jī)的型號(hào)相匹配。否則,將會(huì)損壞步進(jìn)電機(jī)及步進(jìn)電機(jī)驅(qū)動(dòng)器 。
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