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Design and experimental validation of a hybrid actuator based on piezoceramics and shape-memory-alloys

: Neugebauer, Reimund; Pagel, Kenny; Drossel, Welf-Guntram

Scheidl, Rudolf:
Mechatronics 2012, the 13th Mechatronics Forum, International Conference. Proceedings. Vol.1 : September 17-19, 2012, Linz, Austria
Linz: Trauner, 2012 (Advances in mechatronics)
ISBN: 978-3-99033-042-5 (Vol.1)
ISBN: 978-3-99033-045-6 (Vol.2)
ISBN: 978-3-99033-046-3 (Vol.3)
International Conference "Mechatronics Forum" <13, 2012, Linz>
Conference Paper
Fraunhofer IWU ()
actuator; piezoactuator; shape memory alloy; small machine; hybrid actuator; cascaded control

In this paper we present the design and experimental validation of a novel hybrid actuator combining the advantages of shape memory alloys and piezoceramics in one setup. The SMA-part of the Actuator realizes the required stroke overplayed by the piezo-part which ensures precision and the aimed dynamics. The two actuator parts are designed regarding geometry, applied load and control aspects. Beyond that control concepts for positioning applications are investigated. In the beginning the actuator parts piezo and SMA are considered as single and independent control loops to develop the base of the actuator control. Further these control loops are interconnected to realize an overlayed actuator control. There are two concepts to be considered. Firstly an open loop concept based on dynamic splitting using signal filters and secondly a concept basing on a cascaded arrangement to exploit the whole potential of this combination. Furthermore a hybrid actuator is built to investigate its properties. Experimental results further show its potential to serve as miniaturized positioning device for small machines.