IS200DAMCG1ABB
IS200DAMCG1ABB
伺服電機(jī):是在伺服系統(tǒng)中控制機(jī)械元件運(yùn)轉(zhuǎn)的發(fā)動(dòng)機(jī),是一種補(bǔ)助馬達(dá)間接變速裝置。伺服電機(jī)是可以連續(xù)旋轉(zhuǎn)的電-機(jī)械轉(zhuǎn)換器。作為液壓閥控制器的伺服電機(jī),屬于功率很小的微特電機(jī),以永磁式直流伺服電機(jī)和并激式直流伺服電機(jī)zui為常用。
伺服電機(jī)的作用:伺服電機(jī)可使控制速度,位置精度非常準(zhǔn)確。
伺服電機(jī)的分類:直流伺服電機(jī)和交流伺服電機(jī)。
直流伺服電機(jī)的輸出轉(zhuǎn)速與輸入電壓成正比,并能實(shí)現(xiàn)正反向速度控制。具有起動(dòng)轉(zhuǎn)矩大,調(diào)速范圍寬,機(jī)械特性和調(diào)節(jié)特性的線性度好,控制方便等優(yōu)點(diǎn),但換向電刷的磨損和易產(chǎn)生火花會(huì)影響其使用壽命。近年來出現(xiàn)的無刷直流伺服電機(jī)避免了電刷摩擦和換向干擾,因此靈敏度高,死區(qū)小,噪聲低,壽命長(zhǎng),對(duì)周圍電子設(shè)備干擾小。
直流伺服電機(jī)的輸出轉(zhuǎn)速/輸入電壓的傳遞函數(shù)可近似視為一階遲后環(huán)節(jié),其機(jī)電時(shí)間常數(shù)一般大約在十幾毫秒到幾十毫秒之間。而某些低慣量直流伺服電機(jī)(如空心杯轉(zhuǎn)子型、印刷繞組型、無槽型)的時(shí)間常數(shù)僅為幾毫秒到二十毫秒。
小功率規(guī)格的直流伺服電機(jī)的額定轉(zhuǎn)速在3000r/min以上,甚至大于10000r/min。因此作為液壓閥的控制器需配用高速比的減速器。而直流力矩伺服電機(jī)(即低速直流伺服電機(jī))可在幾十轉(zhuǎn)/分的低速下,甚至在*堵轉(zhuǎn)的條件下工作,故可直接驅(qū)動(dòng)被控件而不需減速
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