伺服電動機(jī)本身也在向高速方向發(fā)展,與上述高速編碼器配合實現(xiàn)了60m/min甚至100m/min的快速進(jìn)給和1g的加速度。為保證高速時電動機(jī)旋轉(zhuǎn)更加平滑,改進(jìn)了電動機(jī)的磁路設(shè)計,并配合高速數(shù)字伺服軟件,可保證電動機(jī)即使在小于1μm轉(zhuǎn)動時也顯得平滑而無爬行。
交流直線伺服電機(jī)直接驅(qū)動進(jìn)給技術(shù)已趨成熟。數(shù)控機(jī)床的進(jìn)給驅(qū)動有“旋轉(zhuǎn)伺服電機(jī)精密高速滾珠絲杠”和“直線電機(jī)直接驅(qū)動”兩種類型。傳統(tǒng)的滾珠絲杠工藝成熟加工精度較高,實現(xiàn)高速化的成本相對較低,所以目前應(yīng)用廣泛。使用滾,珠絲杠驅(qū)動的高速加工機(jī)床移動速度90m/min,加速度1.5g。但滾珠絲杠是機(jī)械傳動,機(jī)械元件間存在彈性變形、摩擦和反向間隙,相應(yīng)會造成運(yùn)動滯后和非線性誤差,所以再進(jìn)一步提高滾珠絲杠副移動速度和加速度比較難了。
新聞:鄒平縣背光源貼膜機(jī)專用步進(jìn)電機(jī)MT42STH38-1684A型錄
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