Department of Electrical Engineering
College of Engineering Trivandrum

Generation of Rotating Magnetic Field


The stator of three phase generators or motors have three independent windings, each placed on the slots at equal distance from each other. The figure shows the simplified diagram of the position of the phase windings on the stator slots. Consider a three phase supply is connected to the stator windings which will result in currents separated by 120 degrees.  At any instant, the direction and magnitude of the flux produced depends upon the position of the winding and the direction and magnitude of current in the respective phases. The resultant flux will be the vector sum of the fluxes. For sinusoidal currents in the windings, the net field will have constant magnitude and will be rotating.

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Rotating Magnetic field Demo