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Proceedings Paper

Extended-temperature-range piezoactuator system with very large movement
Author(s): Paul M. Weaver; Andrew Ashwell; Yulan Zheng; Simon C. Powell
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Paper Abstract

The Servocell planar bimorph actuator employs a very simple novel construction which provides a very large movement (up to 3mm) in a compact profile. It provides solid state actuation for high volume, cost sensitive applications e.g. valves, locks and circuit breakers. Thermal variations in the piezoelectric properties usually result in a compromise in performance, particularly at low temperature. This paper presents new data on the effects of thermal variations in piezoelectric properties on actuator performance. These data are used to devise a control regime which takes advantage of thermal variations in piezo activity to provide a wide operating window across the temperature range -40 to +125°C. It is shown how the stroke of the actuator can actually be increased at lower temperatures. The system is very simple and can thus be implemented using a very low cost microcontroller. The use of the system is illustrated by real life applications in optical switching, valves, locks, and trip mechanisms.

Paper Details

Date Published: 13 August 2003
PDF: 9 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484690
Show Author Affiliations
Paul M. Weaver, PBT Ltd. (United Kingdom)
Andrew Ashwell, PBT Ltd. (United Kingdom)
Yulan Zheng, PBT Ltd. (United Kingdom)
Simon C. Powell, PBT Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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