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

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

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Electrical Machines
Flashing the field of DC generator means

  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.
 increasing flux density by adding extra turns of winding.
  neutralising residual magnetism.

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