Active solar panel tracking system actuated by shape memory alloy springs

The unique properties (e.g. Shape memory effects) exhibited by shape memory alloys (SMAs) offer the possibility of producing Smart Sun Tracking Mechanisms (SSTMs) for photovoltaic panels. The paper presents an experimental model of an active solar panel tracking system, conceived by authors. This model uses SMA springs as actuators. The SMA springs work as linear actuators by contracting with great strength and speed when heated. The SMA springs attached to this structure can be activated to accurately change the position of the solar panel, following, this way, the motion of the sun throughout the day (appropriately tilted to directly face the sun during the day time). The active shape-change control of SMA spring, the possibilities for miniaturization, easy integration in system structure can effectively increase the efficiency of such SSTM.