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Proceedings Paper

Control of a shape memory alloy actuator using pulse width (PW) modulation
Author(s): Ning Ma; Gangbing Song
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Paper Abstract

Shape memory alloy (SMA)s, in particular the nickel-titanium alloy (or Nitinol), have been used as actuators in some astronautic, aeronautic and industrial applications. Future will see more SMA application if less energy is required for actuation. This paper presents the design and experimental results of control of an SMA actuator using Pulse Width (PW) Modulation to reduce the energy consumption by the SMA actuator. An SMA wire test stand is used in this research. Open-loop testing of the SMA wire actuator is conducted to study the effect of the PWM parameters. Based on results of testing results and parameter analysis of the PW modulator, a PW modulator is designed to modulate a Proportional plus Derivative (PD) controller. Experiments demonstrate that control of the SMA actuator using PW modulation effectively save actuation energy whiling maintaining same control accuracy as compared to continuous PD control. PW modulator also demonstrates robustness to external disturbances. A comparison with pulse width pulse frequency (PWPF) modulator is also presented.

Paper Details

Date Published: 10 July 2002
PDF: 12 pages
Proc. SPIE 4693, Smart Structures and Materials 2002: Modeling, Signal Processing, and Control, (10 July 2002); doi: 10.1117/12.475232
Show Author Affiliations
Ning Ma, The Univ. of Akron (United States)
Gangbing Song, The Univ. of Akron (United States)

Published in SPIE Proceedings Vol. 4693:
Smart Structures and Materials 2002: Modeling, Signal Processing, and Control
Vittal S. Rao, Editor(s)

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