MDD090C-N-040-N2M-110GL1眾所周知,伺服是由3個(gè)反饋系統(tǒng)構(gòu)成:位置環(huán)、速度環(huán)、電流環(huán),越是內(nèi)側(cè)的環(huán),越需要提高其響應(yīng)性,不遵守該原則,則會(huì)產(chǎn)生偏差和震動(dòng)。由于電流環(huán)是最內(nèi)側(cè)的環(huán),以確保了其充分的響應(yīng)性,所以我們只需要調(diào)整位置環(huán)和速度環(huán)即可。調(diào)整的主要參數(shù)是:位置環(huán)增益、速度環(huán)增益、速度積分時(shí)間常數(shù)。
位置環(huán)增益:
MDD090C-N-040-N2M-110GL1是決定對(duì)指令位置跟隨性的參數(shù)。與工件表面的優(yōu)劣有密切關(guān)系,僅在驅(qū)動(dòng)器工作在位置方式時(shí)有效,當(dāng)伺服電機(jī)停止運(yùn)行時(shí),增加位置環(huán)比例增益,能提高伺服電機(jī)的剛性,即鎖機(jī)力度。
伺服系統(tǒng)的響應(yīng)性取決于位置環(huán)增益,提高位置環(huán)增益,位置環(huán)響應(yīng)和切屑精度都會(huì)改善,同時(shí)減少調(diào)整時(shí)間和循環(huán)時(shí)間
MDD090C-N-040-N2M-110GL1但位置環(huán)增益又受限于速度環(huán)特性和機(jī)械特性。為了提高響應(yīng)性,如果僅提高位置環(huán)增益,作為伺服系統(tǒng)的整體的響應(yīng),容易產(chǎn)生震動(dòng),所以請(qǐng)一邊注意響應(yīng)性一邊提高速度環(huán)增益。
特點(diǎn):位置環(huán)增益提高,響應(yīng)性越高,定位時(shí)間越短。過大會(huì)引起震動(dòng)和超調(diào)
調(diào)整原則:
MDD090C-N-040-N2M-110GL1在保證位置環(huán)系統(tǒng)穩(wěn)定工作,位置不超差(過沖)的前提下,增大位置環(huán)的增益,以減小位置滯后量。簡(jiǎn)單的方法,提高位置環(huán)增益直至過沖,然后再降低位置環(huán)增益,即為剛度較好的位置環(huán)增益
速度環(huán)比例增益、速度積分時(shí)間常數(shù)
MDD090C-N-040-N2M-110GL1速度環(huán)比例增益、速度積分時(shí)間常數(shù)僅對(duì)電機(jī)在運(yùn)行時(shí)(有速度)起作用。速度環(huán)比例增益的大小,影響電機(jī)速度的響應(yīng)快慢,為了縮短調(diào)整時(shí)間,需要提高速度環(huán)增益,控制超程或行程不足。速度環(huán)積分時(shí)間常數(shù)的大小,影響電機(jī)穩(wěn)態(tài)速度誤差的大小及速度環(huán)系統(tǒng)的穩(wěn)定性。當(dāng)伺服電機(jī)帶上實(shí)際負(fù)荷時(shí),由于實(shí)際負(fù)載轉(zhuǎn)矩和負(fù)載慣量與缺省參數(shù)值設(shè)置時(shí)并不相符,速度環(huán)的帶寬會(huì)變窄,如果此時(shí)的速度環(huán)帶寬滿足需求,沒有發(fā)生電機(jī)速度爬行或振蕩等現(xiàn)象,可以不調(diào)整速度環(huán)的比例增益及積分時(shí)間常數(shù)。如果實(shí)際負(fù)荷使電機(jī)工作不穩(wěn)定,發(fā)生爬行或振蕩現(xiàn)象,或者現(xiàn)有的速度環(huán)帶寬不理想,則需要對(duì)速度環(huán)的比例增益、積分時(shí)間常數(shù)進(jìn)行調(diào)整。
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