LOL, I was just reading some of this thread.. I saw one my posts said,
"I think my next bike might need electrical assist.. I'll be 65 next month.."
That was the old days.. I'll be 78 next month!
Yesterday, I found my old Shake-to-charge flashlight.
It still works, but the tiny battery is on it's last legs.
I'm thinking about looking for a small Lipo-4 pack for it.
It might have a capacitor inside! I see one that looks a little like mine on Amazon.
https://www.amazon.com/HaveLight-Nig...dp/B00NNYH814/
I think you could get some power out of some strong magnets on the rim. But, if the rim has a lot of iron in the steel, it might dilute the fields from the mags, into one big doughnut field.
Might work better with a non-magnetic rim. Aluminum or carbon fiber etc.
Anyways, if you alternate the N&S poles of the mags, you can get AC out of your coils. That means you will need a "Full-Wave-Bridge" diode array to get a good DC output.
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Yikes, I just rubbed some real-strong-magnets on that old flashlight. It's staying ON! It's been on for 20 minutes! The battery is about the size of an aspirin.
Before, it was running out of power within a few seconds, after a few minutes of shaking.
Here a link to the mags I use..
https://www.amazon.com/gp/product/B08NJWM6YD/
If you are one of those guys who never read the instructions, DO NOT BUY these mags.
They are not safe to handle, without reading the instructions. I'm not kidding..