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Closed loop control for shape memory alloy actuators

Regelung mit geschlossener Rückführung von Aktuatoren aus Formgedächtnislegierung
: Auerswald, Christian; Senf, Björn; Mehner, Jan; Drossel, Welf-Guntram


Univ. Politecnica de Catalunya, Barcelona; Institute of Electrical and Electronics Engineers -IEEE-:
11th International Multi-Conference on Systems, Signals & Devices, SSD 2014 : Castelldefels-Barcelona, Spain, 11 - 14 February 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3867-4
ISBN: 978-1-4799-3865-0
ISBN: 978-1-4799-3866-7
International Multi-Conference on Systems, Signals & Devices (SSD) <11, 2014, Castelldefels>
International Conference on Sensors, Circuits and Instrumentation Systems (SCI) <2014, Castelldefels>
Fraunhofer IWU ()
Smart System; adaptive lightweight structure; shape memory alloy; SMA; NiTi; closed-loop control

This paper describes design considerations of a control circuit for adaptive hybrid structures. These consist of a fiber-reinforced lightweight structure with a thermoplastic matrix and additional shape memory alloy wires, which can be used both as actuators and sensors. In order to use their properties, a control circuit able to heat the actuator wires and to measure their electrical resistance when used as a sensor is needed. In contrast to most references using expensive lab test equipment, a small sized, stand-alone control box is presented. It combines advantages of precision linear current sources for resistance measurement with high efficiency switch-mode converters delivering the wire heating current.