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I'm not an electronics whiz, by any stretch of the imagination, but I'm very interested in this topic and would love to start discussion.

I would start from the mechanical angle first. Rather than have some circuitry decide when to apply just the regenerative brake and when the full friction power of the brake was needed, I would rig two brake lines on one brake lever. The first would kick on with minimal pressure, pushing a caliper with an oversized dynamo on it. A big wheel, gear ratios, making this part work would take fiddling, but the goal is obviously to transfer the mechanical energy of the wheel into the dynamo as efficiently as possible. If depressed all the way, the friction brake line would come into play. There have been a number of dynamo bike prototypes scrapped because of dynamos that took away too much wheel inertia, and their downfall is exactly the asset this project needs.

From there, I'd start with a rectifier bridge capable of handling the voltage loads of the dynamo. I'm assuming that the electrical motor will be turned on by the user, rather than always on. Here's where I'll show how green I am to this: I don't know quite where to go next. I would lift and modify circuits from some other projects to suit your voltages.

Nick another answer use a relay to switch from battery power to a load resistor to the motor when braking

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16y ago

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