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Sensors 2010, 10(1), 112-127; doi:10.3390/s100100112
Article

Tracking Control of Shape-Memory-Alloy Actuators Based on Self-Sensing Feedback and Inverse Hysteresis Compensation

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Received: 18 November 2009 / Revised: 15 December 2009 / Accepted: 16 December 2009 / Published: 28 December 2009
(This article belongs to the Special Issue Advances in Actuators)
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Abstract

Shape memory alloys (SMAs) offer a high power-to-weight ratio, large recovery strain, and low driving voltages, and have thus attracted considerable research attention. The difficulty of controlling SMA actuators arises from their highly nonlinear hysteresis and temperature dependence. This paper describes a combination of self-sensing and model-based control, where the model includes both the major and minor hysteresis loops as well as the thermodynamics effects. The self-sensing algorithm uses only the power width modulation (PWM) signal and requires no heavy equipment. The method can achieve high-accuracy servo control and is especially suitable for miniaturized applications.
Keywords: shape memory alloys; self-sensing control; hysteresis model shape memory alloys; self-sensing control; hysteresis model
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.

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Liu, S.-H.; Huang, T.-S.; Yen, J.-Y. Tracking Control of Shape-Memory-Alloy Actuators Based on Self-Sensing Feedback and Inverse Hysteresis Compensation. Sensors 2010, 10, 112-127.

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