Abstract
The application of shape memory alloys (SMA) for actuators is still limited to a couple ofparticular prototypes, and only a few commercial actuators are available. One of the mainreasons is the lack in robustness regarding substantial fatigue and changes in boundaryconditions. In order to improve the life time behavior and reduce the fatigue ofSMA actuators, a self-sensing control strategy is presented. Based on resistancefeedback, the heating power at full contraction is controlled in order to avoidoverheating without reducing the operating voltage. This allows fast actuationwithout thermal overload of the SMA. The concept was proved experimentally.Life time tests show a considerable increase in life cycles and reduce of fatigue.
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