內(nèi)密控旋轉(zhuǎn)編碼器簡介
旋轉(zhuǎn)編碼器在工廠自動化(FA)上的應(yīng)用已經(jīng)有相當長一段時間了,最具代表性的是在工業(yè)機器人;機器人機械臂有二軸的,也有多軸的,但是驅(qū)動機械臂動作的都是馬達在機械人的構(gòu)造中,所有機械臂動作的動能來源是馬達。大部份的FA及OA設(shè)備的主要動能來源也是馬達;并且馬達受到不同指令形式地控制。對馬達運行的控制方式有只在某一段時間內(nèi)以一定的速度運行,也有復(fù)雜而不規(guī)則的運行,還有多軸同時運行等,這樣形成了機械設(shè)備各式各樣的運行狀態(tài)。
對馬達的控制通常是速度控制和位移量(選轉(zhuǎn)量)控制,控制方式是隨著馬達的種類不盡相同。例如步進電機的移動控制,在開環(huán)控制狀態(tài)下,其轉(zhuǎn)動角度(圈數(shù))是隨控制脈沖數(shù)而同步變化,除非失步等特別的情況,否則應(yīng)該可以嚴格同步移動。除步進電機外,其他電機的旋轉(zhuǎn)量檢測,如果沒有信號反饋要達到精密控制是非常困難的。總之,電機轉(zhuǎn)速的快慢控制,如能以控制量表示,并反饋至控制電路,使電機維持在一定的速度,或停止在一定的位置。一般而言,此旋轉(zhuǎn)反饋量由旋轉(zhuǎn)編碼器來檢測。
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