efficiency

Discussion in 'Homework Help' started by Geney, Apr 4, 2012.

  1. Geney

    Thread Starter New Member

    Apr 2, 2012
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    why is the efficiency of a generator more than that of motor? also is there any significance for the gap between the efficiency curve of a generator and a motor. if so, what is the significance?
     
  2. eng.mustafasalah

    Member

    Nov 10, 2011
    41
    2
    the generator windings are made of more thicker windings hence have lesser resistance and hence lower copper losses

    in a motor the armature produces back emf which tries to oppose the motion of the motor (there are two opposing voltages )
    but in generator there are no opposing voltages

    also the leakage of magnetic flux produces power losses in a motor but the leakage of the flux produced by the field winding in generator is minimum and also not so critical and so it does not pose a problem to lose some flux
     
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  3. Geney

    Thread Starter New Member

    Apr 2, 2012
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    yeah.. in case of swinburnes test we consider the same dc machine as generator and motor... then there wil be no difference in the construction. then how can we give a reason for max efficiency?
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    Not what I heard :)
     
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