经编电子送经系统的滞后响应

为减少由开、停机过程中经纱张力波动引起的经编停车横条织疵，通过实验测试经编机电子送经系统在开、停机过程中主轴与经轴电动机的运动曲线。分析认为：开、停机过程中送经系统经轴电机滞后于主轴运动，开机时滞后时间随着主轴转速的升高而减小，滞后角度逐步增大；停机时滞后时间随着主轴转速的降低而变化不大，滞后角减小，引起经纱张力呈现“正常→偏松状态下的松、紧变化→较紧状态下的松、紧变化→正常”的波动。同时，还对主控制器性能、系统控制程序、伺服控制模式、送经伺服性能、伺服参数设置和主轴编码器等影响经编送经系统滞后的主要因素进行了讨论。

Time-delay analysis of electronic let-off system on warp knitting machine

The stopping mark is common fabric defects in warp knitting production, and it is considered that the mark is caused by tension of warp yarn when turning on and/or turning off the machine. In this paper, the motion curve of the main shaft of the machine and the beam motor of electronic let-off system was tested. The beam motor lags behind main shaft is tested in warp beam let-off system when turning on and/or turning off the machine. The lag time is reduced when turning on the machine, and the lag angle gradually increases with the main shaft speed increasing; Meanwhile the lag time changes a little when turning off the machine, and the lag angle is reduced. That caused the tension change “normal→the loose and tight changing in the state of partial loose→the loose and tight changing in the state of partial tight→normal” of warp yarn. In this paper, it is discussed that main factors which affect the lag performance of warp let-off system are those, such as main controller of let-off system, the software of control, the control mode of servo system, the servo performance, servo parameter setting, as well as main shaft encoder.