Electric bike alternators?
I'm just starting to look at electric bikes, and learning what some of the differences are among them...
I notice the energy from the disc brakes can be channeled back into charging. I also notice most of the hub-motor models will only have a drive unit on one wheel (I'm guessing to avoid overkill, and keep the other wheel available for a disc brake rotor).
Has anyone come up with alternators to fit in the non-motorized hub and/or the pedal assembly for channeling energy back into charging? After all, those parts are already in motion. I'm not familiar with the ins-and-outs of alternator design, but I'm wondering if a brushless alternator would have significantly less resistance, allowing it to give more energy than it takes?