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

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 de...

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Published inSensors (Basel, Switzerland) Vol. 10; no. 1; pp. 112 - 127
Main Authors Liu, Shu-Hung, Huang, Tse-Shih, Yen, Jia-Yush
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 01.01.2010
Molecular Diversity Preservation International (MDPI)
Subjects
Algorithms
Alloys
Alloys - chemistry
Equipment Design
Equipment Failure Analysis
Feedback
hysteresis model
Mathematical models
Power supply
self-sensing control
Sensors
shape memory alloys
Signal Processing, Computer-Assisted - instrumentation
Temperature effects
Transducers
shape memory alloys
hysteresis model
self-sensing control
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Summary: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.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s100100112