An innovative drive mechanism developed by Indian Space Research Organisation for deployment and positioning of solar flaps is successfully working on the geosynchronous multi-purpose communication satellite INSAT-2E. The drive mechanism1 works on linear actuators made of Shape Memory Alloy (SMA) wires and is capable of driving solar flaps in 2-degree steps, like a stepper motor. This paper describes the design of the mechanism, qualification testing and on-orbit experience.
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