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Watching an old Royal Institution Christmas Lecture, given by Prof. Eric Laithwaite in 1974, there was a demonstration of a simple 3-phase induction motor. As the applied voltage was increased, the direction of spin suddenly reversed at about 203 volts. I have never found an explanation for this. Can anyone help?
http://www.rigb.org/christmas-lectu...h-the-looking-glass/tweedledum-and-tweedledee
from 21 minutes 21 seconds
http://www.rigb.org/christmas-lectu...h-the-looking-glass/tweedledum-and-tweedledee
from 21 minutes 21 seconds