Josepi wrote:
PM = permanent magnet.

I guess your motives are unclear then. I understand you want to
generate electrical energy form a mechanism installed on your whel
chair wheels. A generator would be the only way to do this whatever
the mechanism.
Is my logic too far off?

-----------------
Yes , he wants to supply power two strings of LEDs that he has mounted on
his wheels . Though I don't understand why he wants two separate power
feeds, unless he has them strobing or flashing independently of each other .
Hactar , you're on the right track with the CD/plastic disc idea . I
suggest the static component could be something similar to the power pickup
brushes used on slot cars . Simple and robust , with mimimal protrusion that
can be damaged when the wheels are off the chair .

--
Snag
Learning keeps
you young !