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Design approach for solid state shape memory alloy actuators

 
: Pagel, Kenny; Drossel, Welf-Guntram; Zorn, Wolfgang; Bucht, Andre; Kunze, Holger

Vin, Leo J. de ; Karlstad University:
Mechatronics 2014, 14th Mechatronics Forum International Conference : Karlstad, Sweden, June 16-18, 2014
Karlstad, 2014
ISBN: 978-91-7063-564-9
pp.118-125
International Conference "Mechatronics Forum" <14, 2014, Karlstad>
English
Conference Paper
Fraunhofer IWU ()
shape memory alloys; actuator; solid state actuator; SMA; small machine tools; miniaturized drives

Abstract
Actuators for small machine tools usually need separate guidance elements since they cannot carry transversal loads. Hence, cross section and mass as well as the complexity of the actuator system increase. In the paper we present a novel Shape-Memory-Alloy (SMA) actuator design, which does rather not require additional guidances. The stiffness in directions different from the actuators moving direction is realized by the geometric arrangement of the SMA elements. Those are designed by general formulations regarding the requested degrees of freedom, geometry, applied load, and control aspects. To evaluate this general design approach a multi domain model of a linear actuator is developed. That covers not just the mechanical part of the arrangement; but also the transient behavior of the SMA. Beyond that an adaptive closed loop control concept for positioning applications, which considers the nonlinear positioning behavior of SMA actuators, is developed and implemented. Furthermore, a linear actuator is designed to validate the design approach experimentally and to investigate the actuators capabilities to serve as miniaturized drive.

: http://publica.fraunhofer.de/documents/N-294640.html