I think, though, that if you use an induction motor as a generator, it
will sync itself up if you connect the line at the synchronous speed
(normally 1800 RPM for 60 Hz). Then, if the motor is driven faster, it
puts power back into the line. If it goes slower, the line puts power into
the motor.

MANY years ago, my father needed a source of 50 Hz power to test equipment
shipped outside the US. He made a rotating transformer out of a 3 phase
motor. The field was driven with 60 Hz. The shaft was rotated at a speed
to generate 10 Hz. The 50 Hz was taken off the rotor. I always thought
that was pretty clever.

Harold



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