FABRICATION OF A PEDAL OPERATED ELECTRIC GENERATOR

ABSTRACT

Pedal operated electric generator is a system that uses the pedalling mechanism to generate electricity. The pedal mechanism is transmitted through links to the generating unit. The generator has an internal winding circuitry through which electromagnetic induction generates electricity.

Electricity in the world today has become a basic need. There is need for power supply in off grid regions and other physically inaccessible areas. Due to this reasons, pedalling system has become the most convenient tool for power generation. We set about to design and fabricate a system that would accomplish the following objectives; provide cheap power to off grid regions, produce sufficient power to meet house hold requirements, provide alternative power during power outage, and develop a pedalling system that is compact and strain free.

We were able to accomplish the above objectives as we designed and fabricated a system that was compact while using cheap locally available materials. Our system was able to generate a maximum of 61.6 watts while running 1580 rpm. This amount of power is able to run common house appliances such as radios, lights, and phones.

During the fabrication of our system, we were faced by various problems that should be addressed in future projects in the area of human powered electric generators. These limitations included; the connections between the pulleys and the generator was not perfect as there was some amount of slippage thus contributing to the power loss in the system, the bicycle stand needed some improvement to lower the amount of vibrations experienced on the system during pedalling, and we were not able to determine the perfect amount of voltage required to excite the stator windings of the generator without inducing too much EMF that would make pedalling difficult. Further, our system did not have a variable gear system that would cater for the pedalling needs of different groups of people.