Jinx wrote:
I thought I may be able
> to attach a small DC motor to the main motor's shaft as a
> generator but that's proved too tricky because of space limitations.
> So, any ideas on the most efficient way to induce power into coils
> on the PCB from stator magnets ?

To get it efficient and small you need to reduce
air gaps and consider magnetic flux paths. I think
a sensible option would be to pull some bits from
a commercially made dc motor or generator, and
use a magnet and coil device that are already
curved and designed to be efficient in a rotating
system.

Like a small dc brush motor, has a rotating coil.
You could fit this to your shaft somehow and use
its curved perm magnets around that. Then just
full wave rectify and use a zener for regulation.
:o)
-Roman

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