Bi-Stable SMA Actuator
P. Motzki, S. Seelecke
ZeMA gGmbH, Saarbrücken, Germany, and Universität des Saarlandes, Saarbrücken, Germany
Shape Memory Alloy (SMA) actuators like SMA wires are already present in a few commercially available products, like valves or locking mechanisms. In these actuator systems, the SMA wires are always coupled with an additional biasing mechanism, such as a restoring coil spring. Other possible restoring forces are, for example, the gravitational force of a mass or the pulling force of a second SMA actuator. One drawback of an SMA actuator wire system, such as when coupled with a coil spring, is the continuous energy needed to remain in the contracted position. In this paper, a new SMA actuator design is presented that addresses and solves this drawback. In this actuator, a bi-stable snap mechanism is combined with a protagonist-antagonist SMA wire
configuration. In this way, the actuator has two defined stable and energy-free positions. The SMA wires are only activated to switch between these two positions.
ACTUATOR 2016 Manuscript C2.3
Publication date: 01/06/2016
Manuscript C2.3published in Conference Proceedings ACTUATOR 2016
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