新聞:龍游縣錫膏印刷機(jī)專用步進(jìn)電機(jī)HSTM42-1.8-D-60-6-1.2型錄
從應(yīng)用角度而言，兩者各自優(yōu)勢可以從速度穩(wěn)定性、加載負(fù)載穩(wěn)定性、控制對象上進(jìn)行對比。伺服驅(qū)動器一般控制同步電機(jī)，變頻器一般控制異步電機(jī)。變頻器主要功能是調(diào)速，伺服在調(diào)速、定位、精度上更高，功能也更強(qiáng)大。對升降速、高速啟停、轉(zhuǎn)矩控制要求非常高的行業(yè)與領(lǐng)域，伺服比變頻有著明顯的優(yōu)勢。當(dāng)然，從控制原理上來講，如果變頻器匹配相應(yīng)的編碼器，也可以達(dá)到直流無刷矢量伺服電機(jī)的性能要求。
伺服驅(qū)動器發(fā)展了變頻技術(shù)，在驅(qū)動器內(nèi)部的電流環(huán)，速度環(huán)和位置環(huán)(變頻器沒有該環(huán))都進(jìn)行了比一般變頻更的控制技術(shù)和算法運算，主要的一點可以進(jìn)行的位置控制。
近年來，高端變頻技術(shù)在不斷發(fā)展，配合機(jī)電時間常數(shù)小的電機(jī)也能完成伺服的定位跟蹤工程，特別是在大功率場合，伺服本身的功能就是快速定位跟蹤，變頻器做到這個程度那就是伺服了，目前從企業(yè)的發(fā)展來看，變頻器廠家推出伺服產(chǎn)品，無論是在技術(shù)基礎(chǔ)還是在銷售渠道商都占據(jù)一定的優(yōu)勢，已經(jīng)成為越來越多的變頻器廠家的發(fā)展方向。
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新聞:龍游縣錫膏印刷機(jī)專用步進(jìn)電機(jī)HSTM42-1.8-D-60-6-1.2型錄
L形結(jié)構(gòu)件的有限元模型如圖2所示。為分析結(jié)構(gòu)的不同鋪層方向?qū)χ圃爝^程中回彈變形的影響，比較了L型結(jié)構(gòu)的[]8，[/45/9/-45]2s及[9]8三種鋪層情況，結(jié)果如圖3所示，可見不同鋪層方向?qū)貜椊堑挠绊戄^大。出現(xiàn)這樣的變化趨勢的原因是不同鋪層的層合板L形構(gòu)件在拐角處的徑向及周向熱應(yīng)變及曲率收縮應(yīng)變不同。對[/45/9/-45]2s種鋪層，改變L形結(jié)構(gòu)件的厚度,模擬回彈角度的變化，結(jié)果如圖4所示，可見厚度的改變對回彈角的影響也很明顯，隨著厚度的增加，回彈角變小。
新聞:龍游縣錫膏印刷機(jī)專用步進(jìn)電機(jī)HSTM42-1.8-D-60-6-1.2型錄
其實各位都忽略了一個問題，就是伺服電機(jī)都是同步電機(jī)，其轉(zhuǎn)子轉(zhuǎn)速就是電機(jī)的實際轉(zhuǎn)速，不存在速度差，而變頻器控制對象是異步電機(jī)，其實際轉(zhuǎn)速跟轉(zhuǎn)子轉(zhuǎn)速存在著轉(zhuǎn)差，所以它本身電機(jī)在速度就不是很穩(wěn)定。
伺服的基本概念是準(zhǔn)確、、快速定位。變頻僅僅是伺服控制的一個必須的內(nèi)部環(huán)節(jié)，伺服驅(qū)動器中同樣存在變頻(要進(jìn)行無級調(diào)速)。但伺服將電流環(huán)速度環(huán)或者位置環(huán)都閉合進(jìn)行控制，這是很大的區(qū)別。除此外，伺服電機(jī)的構(gòu)造與普通電機(jī)是有區(qū)別的，要滿足快速響應(yīng)和準(zhǔn)確定位。同步伺服的成本價格及其昂貴，這樣在現(xiàn)場應(yīng)用允許的情況下多采用交流異步伺服，這時很多驅(qū)動器就是高端變頻器，帶編碼器反饋閉環(huán)控制。所謂伺服就是要滿足準(zhǔn)確、、快速定位，所以往往只有高端的產(chǎn)品才采用伺服系統(tǒng)。
新聞:龍游縣錫膏印刷機(jī)專用步進(jìn)電機(jī)HSTM42-1.8-D-60-6-1.2型錄
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