Three Phase Induction Motor: The Principles Of Induction Motor

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Three phase induction motors Principle of operation Induction motor is a motor which convert electrical energy into mechanical movement. It consist of two main parts namely stator and rotor. Stator, as the name imply, it remains stationary in the motor whereas the rotor consists of cylindrical laminated core with parallel slots. For the stator, when its primary winding is supply with an AC source, a rotating magnetic field is being produced and it is rotating at the synchronous speed. At first, the rotor is standing still whereas the flux of the rotating magnetic field cut every solid conductor of the rotor. Change in flux linkage is produced due to the rotor conductors which remains stationary whereas the sinusoidal stator field is rotating. This causes an induced current…show more content…
This current, when flow through the conductor, it reacts with the magnetic field. Current carrying conductor inside the magnetic field is experiencing a mechanical forces. For the motor, Fleming’s left hand rule is to be apply to know the direction of the motion. By now, the rotor conductors is experiencing this mechanical forces being produced. This force causes the rotor to start rotating inside the stator. The rotor will try to achieve the speed of rotating magnetic field and once this has been done, there will be no relative speed between rotors and rotating magnetic field which means that there is no current induced in the rotor conductor. That means, there will be no mechanical force acts on the rotor conductor at this condition. Therefore, the rotor reduce in speed. As the rotor decelerates, again a relative speed between rotor and rotating magnetic field is being

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