When the three phase stator windings, are fed by a three supply a magnetic flux of constant magnitude is producing and rotate at synchronous speed in the air gap, these flux sweeps past the rotor surface and so cuts the rotor conductors.Due to the relative speed between stator and rotor conductors, an e.m.f is induced in the rotor conductors, according to faraday's law.Due to induced e.m.f current is produce and force is induced, according to lenz's law for opposing the relative speed the rotor rotate in the stator field flux direction.
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