We have been given a project to design our own alternative energy source to power a small electric screwdriver (around 4v).. Instead of using the normal ideas of solar and wind power that other groups are trying to create we wanted to go outside the box and use a different mechanism.
Therefore we came up with an idea of using bungees attached to a drive shaft, using a handle we would turn the drive shaft to tighten the bungees and then lock them off. we would then release the bungees to release the energy and this will turn the drive shaft, the drive shaft will be connected to a series of gears which will turn the 'generator'.
We are currently thinking of using a 12v dynamo, but how would we charge a 12v battery with this?
Do you think it would be better to use a stepper motor and re-designing or using a dynamo?
We are open to any ideas you may have
Therefore we came up with an idea of using bungees attached to a drive shaft, using a handle we would turn the drive shaft to tighten the bungees and then lock them off. we would then release the bungees to release the energy and this will turn the drive shaft, the drive shaft will be connected to a series of gears which will turn the 'generator'.
We are currently thinking of using a 12v dynamo, but how would we charge a 12v battery with this?
Do you think it would be better to use a stepper motor and re-designing or using a dynamo?
We are open to any ideas you may have