Working Principle of Three Phase Induction Motor

Because of various advantages like low initial current high starting torque and improved power factor it is used in applications that require high torque cranes and elevators. Thus from the working principle of three phase induction motor it may be observed that the rotor speed should not reach the synchronous speed produced by the stator.


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The three phase induction motor is the most widely used electrical motorAlmost 80 of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction low cost good operating characteristics the absence of commutator and good speed regulation.

. A three phase induction motor has a stator and a rotor. The rotor windings consist of more number of windings higher induced voltage and less. The stator carries a 3-phase winding called as stator winding while the rotor carries a short circuited winding called as rotor windingThe stator winding is fed from 3-phase supply and the rotor winding derives its voltage and power from the stator winding through electromagnetic induction.

Slip ring induction motor is one of the types of 3-phase induction motor and is a wound rotor motor type. In three phase induction motor the power. If the speeds become equal there would be no such relative speed so no emf induced in the rotor and no current would be flowing and therefore no torque would be generated.


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