Concept of rotating magnetic field in 3 phase induction motor
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When the primary winding or the stator is connected to a 3 phase AC source, it establishes a rotating magnetic fieldwhich rotates at the synchronous speed. Secrets Behind the Rotation: According to Faraday's law an emf induced in any circuit is due to the rate of change of magnetic flux linkage through the circuit.
The three phase currents flow simultaneously through the windings and are displaced from each other by 120° electrical. Each alternating .phase current produces its own flux which is sinusoidal. So all three fluxes are sinusoidal and are separated from each other by 120°. If the phase sequence of the windings is R-Y-B, then mathematical equations for the instantaneous values of the three fluxes ΦR , ΦY ,ΦB can be written as,
ΦR = Φmsin(ωt)
ΦY = Φmsin(ωt - 120)
ΦB = Φmsin(ωt - 240)
As windings are identical and supply is balanced, the magnitude of each flux is Φm
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