Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.
  protect the whole machine.

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

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

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