Re: Slow, small self-excited induction generator

Long time since EE101...but I think this is correct: You are probably
never going to get any useful output from the driven motor. It is
carefully and specifically designed as a MOTOR, after all (for ceiling
fans, in your case). The magnetic circuit tricks used in such motors
to create a rotating field make it virtually impossible to use the
machine as a generator (alternator, actually).

Recommend: Discard the second motor. Connect instead an automotive
alternator with the diodes removed...which is very easy to do. This
gives you direct access to the armature and field coils. Most used
alternators have more than enough residual magnetism in the armature to
be self-exciting. If you've got a used alternator, be sure to check
and replace as necessary the brushes and bearings. Both are part of the
"alternator rebuild kit" appropriate for the specific device.

Paul Weber
Albuquerque, NM

.

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