Distributed activator for a two-dimensional shape memory alloy

Details Distributed activator for a two-dimensional shape memory alloy Distributed activator for a two-dimensional shape memory alloy

F - Mech Eng,Light,Heat,Weapons

03

G

F03G 7/06 (2006.01) A61B 1/005 (2006.01) A61F 2/06 (2006.01) A61M 25/01 (2006.01) H02N 10/00 (2006.01)

Patent

CA 2236522

A distributed activation means including a Shape Memory Alloy (SMA) sheet which has a sufficiently small section to limit the lateral flow of heat. The distributed actuator array includes one or more heating elements disposed on the sheet and for locally heating an adjacent portion of the sheet so that the adjacent portion assumes a predetermined shape when activated to its threshold temperature. An electrical insulator is positioned between the sheet and one or more heating elements to electrically insulate each of the heating elements from the sheet. And a control means for selectively passing an electrical current through one or more heating elements so that the local heating causes the sheet to assume a desired shape.

L'invention concerne un dispositif d'activation réparti comprenant une feuille d'alliage à mémoire de forme présentant une section suffisamment petite pour limiter le flux de chaleur latéral. L'organe d'actionnement réparti comporte un ou plusieurs éléments chauffants disposés sur la feuille et destinés au réchauffement local d'une partie contiguë de la feuille de sorte que la partie contiguë prenne une forme prédéterminée lorsqu'elle est activée vers sa température-seuil. Un isolant électrique est placé entre la feuille et un ou plusieurs éléments chauffants afin d'isoler électriquement de la feuille chaque élément chauffant. Un dispositif de régulation permet de passer sélectivement un courant électrique à travers un ou plusieurs éléments chauffants, de sorte que le réchauffement local provoque l'adoption par la feuille de la forme voulue.

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