140CPS52400
140CPS52400
140CPS52400
1、方法与步骤
分段线性减速的特点是减速点不需要精确确定,减速过程速度曲线如图2所示。首先讨论不利情况,即由伺服系统的速度开始减速过程,具体的减速步骤是:
(1) 初始速度VG经AB段以加速度a2降速到V2,在BC段以V2匀速运行T2个采样周期,用BC这个时间段来补偿减速点A的误差。A点误差是VG对应的一个采样周期的脉冲数NGVGτ/δ,速度为V2时一个采样周期的脉冲数为N2V2τ/δ,则只要保证T2≥NG/N2VG/V2,就可以使BC时间段补偿减速点A点的误差。
(2) 速度V2经CD段以加速度a1降速到V1,在DE段以V1匀速运行T1个采样周期,用DE这个时间段来补偿减速点C的误差。类似地,应保证T1≥V2/V1。由于速度V1较低,假设取V15mm/s,脉冲当量δ1μm,采样周期τ1ms,则单位采样周期应反馈的脉冲数为N15,速度检测误差可达20%。所以,从这段过程开始就可以采用开环控制,以避免由于速度检测误差而引起速度波动。值得注意的是,开环控制算法应包括伺服机构的死区补偿和零漂补偿模块。
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