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Induction Motor and Reactive Power

Does the stator of the Induction machine consume only reactive power? If this is the case, so where does the active power in the rotor come from? Explain.
Asked by: Ereiba | Member Since Nov-2009 | Asked on: Nov 9th, 2009

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buntysurat

Answered On : Nov 13th, 2009

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When the stator of an Induction Motor is energized, a rotating magnetic field across stator periphery is setup which creates flux which inturn links with the Rotor windings. This flux creates Voltage across Rotor winding Terminal. As this Rotor winding is shorted current finds the path to flow. So it should be understood that the Voltage and current induced in Rotor circuit generate the required Active power wiz the KW Rating of Motor. 

  
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The stator does not consumes any active power as it is (except we neglect the stator copper losses) it takes the active power and transfers it to the rotor through magnetic field transformation(means it is first converted in to magnetic energy and then retransformed in to mechanical energy in the rotor).

 

  
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