Electrical Machines
The compensating winding in a DC machine

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

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Electrical Machines
In a star - delta starting of an IM

  resistance is inserted in the rotor.
  reduced voltage is applied to the stator.
  applied voltage per stator phase is 57.7 % of a line volt
  line voltage is 57.7 % of stator voltage.

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