On Tue, 26 Nov 2002, Gary Neal wrote:

*>Yep,
*>
*>         That exactly how it's wired.
*>         Someone suggested placing magnets in the rotor thus making it a
*>permanent magnet rotor.  Anyone ever do that before?  I've got a really
*>nice machine shop at my disposal.  Could machine slots in the rotor and
*>epoxy magnets in there.  The rotor is roughly 3.6" dia. x 2.5" long.  Does

Permanent magnets will build you a pm generator which can generate too
much voltage and is impossible to control (otherwise than with a shunt and
serious mechanical arrangements). Normal generators use a wound rotor.
Take a look at an automotive alternator for ideas. The rotor is wound with
a single coil and fed by sliprings (two) with dc. The pole pieces are two
'hats' each with a sine-shaped edge. The two edges mesh. The number of
poles is the same as the number of coils on the stator (six usually). A
more brutal shape should also work but with much more vibration and noise
in the output voltage.

Peter

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