SLACK SMA WIRE IN SMA ACTUATOR ASSEMBLIES

A measure of the degree of slack of a length of SMA wire is derived from an electrical characteristic measured while supplying a drive signal sufficient to cause contraction. The measure may be the difference between the maximum resistance as contraction starts and the minimum resistance as contract...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	BURBRIDGE, Daniel John
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM BLASTING CINEMATOGRAPHY ELECTROGRAPHY HEATING HOLOGRAPHY LIGHTING MACHINES OR ENGINES FOR LIQUIDS MECHANICAL ENGINEERING MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOTOTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISEPROVIDED FOR OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR PHOTOGRAPHY PHYSICS PRODUCING MECHANICAL POWER SPRING, WEIGHT, INERTIA OR LIKE MOTORS WEAPONS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A measure of the degree of slack of a length of SMA wire is derived from an electrical characteristic measured while supplying a drive signal sufficient to cause contraction. The measure may be the difference between the maximum resistance as contraction starts and the minimum resistance as contraction ceases. This provides an accurate measure which may be used during manufacture of an SMA actuator assembly. Similarly, when using a closed-loop control loop to control drive signals supplied to opposed lengths of SMA wire in an SMA actuator assembly that are slack in the absence of drive signals, signals in the control loop are adjusted by an offset that is derived from measured electrical characteristics of the lengths of SMA wire and compensates for the degrees of slack of the lengths of shape memory alloy wire.