新型电动阀门的速度曲线算法研究

Study on Algorithm of New Electric Valve’s Velocity Curve

关键词:  电动阀门  速度曲线  最小操作步长  定位精度

Key Words:electric valve  speed curve  minimum angular displacement  positioning accuracy

摘要:中高速卫生纸机的上浆流量大，对纸浆浓度的调节精度要求高，普通的电动调节阀门难以胜任，因此，本课题组开发了一种基于直流无刷电机驱动的新型电动阀门。研究了梯形、S形速度曲线的运动规律，得出了能满足定位精度要求的五段S形速度曲线，并在控制器中内置速度控制算法。实例验证表明，该算法能够将电动阀门的最小操作步长由0.9°缩短至0.069°，操作步数由100步提升到1300步。现场应用表明，该算法能够将电动阀门的浓度调节误差由6.32%降低至2.89%，实现了更精细的流量调节。

Abstract:The domestic valve was limited to meet the high accuracy requirements of pulp consistency adjustment for medium and high speed tissue machine. New electric valve based on DC brushless motor was developed. This paper studied the movement process of triangle velocity curve and trapezoidal velocity curve. A five-stage S-shaped velocity curve which could satisfy positioning accuracy was obtained for the valve, and the velocity control algorithm was presetted in controller. The results showed that the algorithm could optimize the minimum angular displacement from 0.9° to 0.069°, and increase the operational steps from 100 to 1300. Besides, the algorithm could reduce the consistency adjustment error from 6.32% to 2.89%. The work realized the precision positioning control of electric valve.