Shape-memory alloy actuators and control methods

F - Mech Eng,Light,Heat,Weapons – 03 – G

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F03G 7/06 (2006.01) G01K 5/48 (2006.01) G12B 1/00 (2006.01)

Patent

CA 2391746

This invention provides stroke-multiplying shape memory alloy actuators and other actuators using electromechanically active materials [collectively referred to in this application as SMA actuators] providing stroke multiplication without significant force reduction, that are readily miniaturizable and fast acting, and their design and use; economical and efficient control and sensing mechanisms for shape memory alloy actuators (including conventional shape memory alloy actuators as well as the stroke- multiplying SMA actuators of this invention) for low power consumption, resistance/obstacle/load sensing, and accurate positional control; and devices containing these actuators and control and sensing mechanisms.

L'invention concerne des actuateurs à mémoire de forme et à multiplication de course et d'autres actuateurs utilisant des matériaux actifs au plan électromécanique (appelés collectivement dans cette application actuateurs AMF), assurant la multiplication de course sans réduction sensible de la force, facilement miniaturisables et à action rapide. L'invention porte également sur leur conception et leur utilisation. Elle se rapporte encore à des mécanismes de détection et de commande économiques et efficaces pour les actuateurs à mémoire de forme (dont les actuateurs à mémoire de forme classiques ainsi que les actuateurs AMF et à multiplication de course), à consommation d'énergie réduite, permettant une détection de résistance/obstacle/charge, et une commande positionnelle précise ; ainsi qu'à des dispositifs contenant lesdits actuateurs et mécanismes de détection.

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