Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 reduce chance of cogging.
 increase starting torque.
  reduce magnetizing current.

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

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

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