Fund Project:陕西省技术创新引导专项（基金）项目 2018HJCG-10;陕西省教育厅产业化培育项目《智能高精度定量阀产业化应用研究》 16JF005;陕西科技大学博士科研启动基金项目 2018BJ-28陕西省技术创新引导专项（基金）项目（2018HJCG-10）；陕西省教育厅产业化培育项目《智能高精度定量阀产业化应用研究》（16JF005）；陕西科技大学博士科研启动基金项目（2018BJ-28）。
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.
