An Electric Generator driven by a Roof Ventilator

Abstract

This paper using three phase synchronous generator install to the roof ventilator by using the low flux density permanent magnet in rotational part and the three phase winding stator install at the ventilator base. When the ventilator rotate, the flux of the permanent magnet rotor part is moving across the air gap and induced the ac. voltage in the three phase stator winding. After that the ac. voltage is rectified to dc voltage and charged to the 12V 5A lead-acid battery. The results are the generator performance at the no-load speed 100 rpm, the generator voltage could be induced 52.3 V. At on-load, the generator could be supplied the load with the real power 1.15W. For the results after install the generator in the ventilator on the roof of a building to charge the 12V battery, and the minimum wind speed for enough charging to battery is at 20 rpm.