Electrical Power From Bike

[ERev]

My idea is to have an electric motor attached to a bike. What I need to know is if a magneto can be hooked up to the pedals/wheels/motor itself to automatically generate the needed electricity for the motor. It would be a self sustaining process that wouldn't require massive heavy batteries. Constant recharging of small batteries is also acceptable. For the 3rd magneto drive (motor itself), the motor would start from the bikes movement in a direct link, then would go on from there.

Is this actually possible, or made possible in some other method that doesn't require a load of batteries that die after 30km? Any tips/suggestions are greatly appreciated, thank you.

 

[mc5w]

You are talking about a perpetual motion machine. If you speed up a shunt wound or permanent magnet motor it will act as a generator and charge your batteries so when going down hill there should not be a huge problem with overspeed if the motor and batteries have enough power capability.

If you want to build your self an electric moped your best bet is to use an adult tricycle. With some tricycles you can extend the chain that connects the pedal transmission to the axle and run it around the sprocket from your gearbox. You might want to use 2 motors that you can connect in series for low speed and parallel for high speed.

You could also use metal wheels to couple the motors directly to the tires. If your state allow manual transmissions on mopeds or if you get a motorcycle license you could use a triple diameter wheel similar to the stepped belt sheaves on drill presses. You would then change gears by lifting up the wheel and motor and sliding it.

To stop this much weight, you would need to connect the rear brakes to a pair of footpedals. When I was a teenager I lived in the Pittsburgh area and grabbing the front to rear brake cable with a gloved hand and pulling bery hard was the only way to stop.