The currents induced in the rotor are distributed around the many rotor
bars. Because the magnetic field in a single phase induction motor is not
'rotating', it works out that the distribution of current in the bars ends
up with half the bars having a force (current carrying conductor in magnetic
field) that tries to turn clockwise, but just as many have a force and
position to try to turn it counter-clockwise and the net torque adds up to
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