Electrical Machines
Compensating windings are used in DC generators

None of these
  to provide path for the circulation of cooling air.
  mainly to reduce the eddy currents by providing local short circuit.
  to neutralize the cross magnetizing effect of the armature reaction.

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  both (A) and (B).
  are provided on the stator for improving power factor.
  are provided in a synchronous motor to make it self starting.
  consists of short-circuited copper bars embedded in the field pole faces.

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