一.負載轉(zhuǎn)速/電機轉(zhuǎn)速 (俗稱速比)習(xí)慣上這是由機械角度考慮決定的,但是由于它是“電子齒輪”的組成部分,在數(shù)值上應(yīng)盡量選取整數(shù),這一點對于旋轉(zhuǎn)工作臺類機械而言尤為突出。
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二.負載軸轉(zhuǎn)一周的移動量對于不同工序要求的機械系統(tǒng),負載軸一轉(zhuǎn)完成的移動量不一樣,絲桿類行進的是螺旋長度;圓臺類旋轉(zhuǎn)的是一周角度;傳送類則是負載軸的周長,等等。它是設(shè)備功能決定的,選擇余地不大。
三.伺服電機編碼器分辨率編碼器是伺服電機乃至伺服系統(tǒng)定位的關(guān)鍵部件,因為伺服電機接收脈沖每旋轉(zhuǎn)一個角度,編碼器就會發(fā)出對應(yīng)數(shù)量的脈沖,回饋給伺服驅(qū)動器,與伺服電機接收的脈沖形成呼應(yīng),稱為閉環(huán)。有了這種環(huán)節(jié),伺服控制系統(tǒng)就會對發(fā)出和收回脈沖數(shù)量予以比較、調(diào)節(jié),地控制伺服電機的轉(zhuǎn)動,從而達到定位。編碼器分辨率表示了伺服電機旋轉(zhuǎn)一周的位移量轉(zhuǎn)換成數(shù)字脈沖信號數(shù)量的數(shù)值,顯然這個數(shù)值越高,表示每轉(zhuǎn)發(fā)出的數(shù)字脈沖越細分,檢測精度也會相應(yīng)提高。當(dāng)然它是與伺服電機一體安裝的,用戶在選擇伺服電機時配套考量。
四.每指令脈沖對應(yīng)的移動量 (亦稱為指令單位)這個數(shù)值由用戶自行選擇,是體現(xiàn)“電子齒輪”“變速”作用的關(guān)鍵數(shù)據(jù),筆者多年來分別使用過三菱MR—J3系列伺服放大器和安川SGDM型伺服單元,體會到這個“指令單位”的取值極重要,它直接影響“電子齒輪”比值,需要結(jié)合機械和電氣設(shè)計綜合考慮,兼顧下列因素:
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