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Sensors 2015, 15(4), 8054-8071; doi:10.3390/s150408054

Hysteresis Analysis and Positioning Control for a Magnetic Shape Memory Actuator

Department of Engineering Science and Ocean Engineering, National Taiwan University, No.1, Sec.4, Roosevelt Rd., Taipei 106, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 21 January 2015 / Revised: 27 March 2015 / Accepted: 30 March 2015 / Published: 7 April 2015
(This article belongs to the Section Physical Sensors)
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Abstract

Magnetic shape memory alloys (MSM alloys), a new kind of smart materials, have become a potential candidate in many engineering fields. MSMs have the advantage of bearing a huge strain, much larger than other materials. In addition, they also have fast response. These characteristics make MSM a good choice in micro engineering. However, MSMs display the obvious hysteresis phenomenon of nonlinear behavior. Thus the difficulty in using the MSM element as a positioning actuator is increased due to the hysteresis. In this paper, the hysteresis phenomenon of the MSM actuator is analyzed, and the closed-loop positioning control is also implemented experimentally. For that, a modified fuzzy sliding mode control (MFSMC) is proposed. The MFSMC and the PID control are used to design the controllers for realizing the positioning control. The experimental results are compared under different experimental conditions, such as different frequency, amplitude, and loading. The experimental results show that the precise positioning control of MFSMC can be achieved satisfactorily. View Full-Text
Keywords: magnetic shape memory alloys; magnetic shape memory actuator; modified fuzzy sliding mode control; hysteresis; positioning control magnetic shape memory alloys; magnetic shape memory actuator; modified fuzzy sliding mode control; hysteresis; positioning control
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

Lin, J.-H.; Chiang, M.-H. Hysteresis Analysis and Positioning Control for a Magnetic Shape Memory Actuator. Sensors 2015, 15, 8054-8071.

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