Electrical Machines
The compensating winding in a DC machine

 is located on commutating poles for improving commutation.
 is located in armature slots for compensation of the armature reaction.
  is located on pole shoes for avoiding the flashover at the commutator.
  is located on pole shoes to avoid the sparking at the brushes.

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop induction generator torque.
  negative sequence currents are generated.
  the damper bars develop synchronous motor torque.
  the damper bars develop induction motor torque.

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