**3.2 Active trackers**

The mechanism of a active solar tracker is to use a motor to enable control the mobility of the tracker. These motors are usually fed by a (**Figure 3**).

The motor executed the command from a signal which have a main aims to provide magnitude and direction and incidence angle. The incidence angle is enable to change from 0° to 90°. We highlight that the active tractors made use performed accurately however, they consume more energy. They are more efficiently than the passive trackers.
