25B-D2P3N104
伺服系統(tǒng)的精度是指輸出量能復(fù)現(xiàn)輸入量的精確程度。在速度控制中，要求高的調(diào)速精度，比較強(qiáng)的抗負(fù)載擾動(dòng)能力。即對(duì)靜、動(dòng)態(tài)精度要求都比較高。
2）穩(wěn)定性好
穩(wěn)定性是指系統(tǒng)在給定輸入或外界干擾作用下，能在短暫的調(diào)節(jié)過程后，達(dá)到新的或者恢復(fù)到原來的平衡狀態(tài)。 對(duì)伺服系統(tǒng)要求有較強(qiáng)的抗干擾能力，保證進(jìn)給速度均勻、平穩(wěn)。 穩(wěn)定性直接影響數(shù)控加工的精度和表面粗糙度。
3）快速響應(yīng)
快速響應(yīng)是伺服系統(tǒng)動(dòng)態(tài)品質(zhì)的重要指標(biāo)，它反映了系統(tǒng)的跟蹤精度。為了保證輪廓切削形狀精度和低的加工表面粗糙度，要求伺服系統(tǒng)跟蹤指令信號(hào)的響應(yīng)要快。 這一方面要求過渡過程時(shí)間要短，一般在200ms以于幾十毫秒； 另一方面要求超調(diào)要小。
4）調(diào)速范圍寬
數(shù)控機(jī)床中，進(jìn)給伺服系統(tǒng)的調(diào)速范圍與伺服系統(tǒng)的分辨率有關(guān)。 一般的調(diào)速范圍要求在脈沖當(dāng)量為0.001mm時(shí)達(dá)到0-24m/min。要求有較寬的無級(jí)調(diào)速范圍，在低速時(shí)運(yùn)行平穩(wěn)無爬行。
伺服進(jìn)給系統(tǒng)的要求
1、調(diào)速范圍寬
2、定位精度高
3、有足夠的傳動(dòng)剛性和高的速度穩(wěn)定性
4、快速響應(yīng)，無超調(diào)
為了保證生產(chǎn)率和加工質(zhì)量，除了要求有較高的定位精度外，還要求有良好的快速響應(yīng)特性，即要求跟蹤指令信號(hào)的響應(yīng)要快，因?yàn)?a class="innerb" b="http://www.chinaaet.com/tags/%E6%95%B0%E6%8E%A7%E7%B3%BB%E7%BB%9F" target="b">數(shù)控系統(tǒng)在啟動(dòng)、制動(dòng)時(shí)，要求加、減加速度足夠大，縮短進(jìn)給系統(tǒng)的過渡過程時(shí)間，減小輪廓過渡誤差。
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