Electrical Machines
In large sized DC machines the compensating windings are provided to

  neutralize voltage induced in coil due to fluctuation of l
 reduce eddy current losses by providing local short circuits.
None of these
 compensate for the decrease in speed due to increase of load.

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3/2 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase
 1/2 times maximum value of flux due to any phase
 3 times maximum value of flux due to any phase

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