绣花机失步现象的分析与研究

Analysis and study of Out-of-step phenomenon of the embroidery machine

分析了绣花机在刺绣过程中出现偏差的可能原因。首先采用圆弧差补的算法来反映加工偏差,通过对偏差的修正,取得了初步的图形优化结果。其次,针对摩擦力、负载力以及其它诸多外界因素引起的不稳定干扰,采用了细分步距角结合圆弧插补的方法来解决丢失步的问题,并且基于三次样条函数对步进电机控制量和步距角之间的关系进行曲线拟合。最后利用连续函数的泰勒展开式特性,通过灵活修改控制量来修正步距角与理论值之间的偏差,使得步进电机的步矩角更加均匀,在实践过程中取得了良好的效果。

The possible reasons of the errors occurred in process of embroidery for embroidery machine are analyzed.First,circular interpolation method is applied to reflect the processing deviation,and primary graphics optimization is obtained through correcting deviation.Second,concerning the unstable interference caused by friction,load and other external factors,the out-of-step may be solved by subdividing step angle combining circular interpolation method.In addition,a method based on cubic spline function is proposed to fit a curve of the relationship between the step motor controlling variable and step angle.Finally the deviation between the step angle and theoretical value is corrected through modifying flexibly the control quantity by applying the characteristics of continuous function Taylor＇s expansion theory to make the step angle of step motor more uniform.Thus good effect is obtained in practice.