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Open AccessArticle

Beyond Snap-In: A Hybrid Nonlinear Control Approach for Actuators Possessing a Square-Law Characteristic

1
Department of Automation & Measurement, Ocean University of China, Qingdao 266100, China
2
Department of Computer Science & Software Engineering, Auburn University, Auburn, AL 36849, USA
3
Department of Electrical & Computer Engineering, Auburn University, Auburn, AL 36849, USA
4
Department of Ocean Engineering, Zhejiang University, Zhoushan 316000, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Current address: 238 Songling Road, Qingdao City 266100, Shandong Province, China.
Electronics 2019, 8(8), 863; https://doi.org/10.3390/electronics8080863
Received: 29 June 2019 / Revised: 30 July 2019 / Accepted: 31 July 2019 / Published: 3 August 2019
(This article belongs to the Section Systems & Control Engineering)
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Abstract

The undesired square-law characteristics in micro-electrostatic actuators and magnetic solenoids results in a limited stable range, which reduces their application fields and performance. This research investigated the isomorphic dynamics in these actuators and observed that the nonlinear drive force and the uncertain time delay are the challenges for the full range position controller design. A hybrid nonlinear control scheme includes an input–output linearization controller and a feedback posicast compensator for targeting these problems with abundant stability margin. The experimental results show that the stable range has been extended from 33% to 80%. Furthermore, it is the first literature report of this type of actuator that can track sinusoidal motion beyond the conventional stable range with an amplitude of 70% of the total range. This contribution can significantly enhance the performance of micro-sensors or expand the usage of electrostatic/magnetic actuators in motion-control systems. View Full-Text
Keywords: electrostatic actuators; magnetic actuators; feedback posicast; solenoids; nonlinear control electrostatic actuators; magnetic actuators; feedback posicast; solenoids; nonlinear control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Li, C.; Wang, X.; Hou, R.; Dean, R.N.; Zhou, L.; Dong, Y.; Song, D. Beyond Snap-In: A Hybrid Nonlinear Control Approach for Actuators Possessing a Square-Law Characteristic. Electronics 2019, 8, 863.

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