"Ron Moore" wrote in message
news:JenIf.2049$Tf3.1926@dukeread09...
The other test is to short the motor leads. If that applies the brakes to
the motor, the you have a permanent magnet DC motor. I have found that
the more braking you get this way, the more torque the motor "seems" to
have, especially at low speed.
Respectfully,
Ron Moore

I scrounged a pair of reel take-up motors from a fairly modern 9-track
computer tape drive. Their efficiency and magnetic coupling was so good
that two motors connected to one another worked almost perfectly
syncronously. If you turned one shaft - even slowly, by hand - the other
motor would track with virtually no perceptable "slip".

LLoyd