Answer to Question #187671 in Electrical Engineering for Alock kumar

Question #187671

Describe the operating principal of 3 phase induction motor.

Expert's answer

The windings in the stator are connected to three phases. Each phase have a phase shift of 120° to the next phase. With appropriate spatial (geometrical) configuration of the windings inside the stator it is possible to achieve a rotating magnetic field inside as if you rotate a permanent magnet inside the stator. The rotor of the induction motor does not have any wires or magnets, but is made of conductive material (aluminum). The field of the stator rotates and passes thru the rotor, this causes currents in the rotor that create their own field according to Lentz's law. The field from the starter and the field induced in the rotor interact, the rotor rotates, the shaft rotates.

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