System modelling is a key element in process control. Applying the many methods of control to improve command response, stability and disturbance rejection requires an understanding of the system under control. Also, for the solar tracking systems, the choice of driving motors, gears, amplifiers, as well as the position detectors is very important step in an active system design. In the present paper the torque of the servomotor used for a single axis solar tracker under Egypt climate, as well as the selection criteria of a servomotor used for the tracker are calculated. The effect of the wind on the solar tracker in Egypt has been considered. Finally, the solar tracker and disturbance transfer functions have been developed.
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