| The exclusive properties (e.g. one way and two way shape memory effect, superelasticity, etc.) exhibited by shape memory alloys (SMAs) offer the possibility of producing smart sun tracking mechanisms for photovoltaic panels (PV panels). This article presents an experimental model, conceived by authors, of an active solar panel tracking system, actuated by two SMA springs working against each other. The shape memory effect enables any SMA spring to work as linear actuator by contracting with great strength and speed when heated. This translating motion is converted into a rotation motion of the photovoltaic panel so that it will be appropriately tilted to directly face the sun during the day time. On one hand, the authors make a brief description of the tracking mechanism, and, on the other hand, they comprehensively explain how the automatic orientation of the photovoltaic panel is controlled. The authors also explain how a SMA spring actually works emphasizing the advantages such a device really exhibits in using it as actuator. The active shape-change control of SMA spring the miniaturization possibilities, easy integration into the system structure, automatic orientation of PV panel (using a programmable logic controller) are underlying an effective increase in the efficiency of such smart sun tracking mechanisms. |
 |