Force control for ultraprecision hybrid electric-pneumatic vertical-positioning device Online publication date: Mon, 09-Aug-2021
by Tomonori Kato; Youwei Xu; Tomohiro Tanaka; Kohei Shimazaki
International Journal of Hydromechatronics (IJHM), Vol. 4, No. 2, 2021
Abstract: This study aims at the development of a control method for reducing motor loads in ultraprecision hybrid electric-pneumatic vertical-positioning devices (HVPDs), such as aspherical lens generators, that work by generating a vertical force via pressure adjustments within the balancing cylinder (BC). We also report on a proposed method for estimating the required vertical direction machining force during material processing that uses a disturbance observer. Furthermore, since our observations of the relationships among BC pressure, linear motor driving current, and vertical force have resulted in the development of a novel control method, we herein present experimental results comparing our proposed and conventional pressure control methods. These results confirm that our proposed method reduces motor loads during material processing and that the use of a disturbance observer allows the external force acting on the stage to be estimated continuously while maintaining high positioning performance.
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