Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  using a flywheel.
  designing the motor for adequate synchronizing power.
  any of above methods.
  providing damper winding in the rotor pole faces.

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Electrical Machines
The armature mmf of a DC machine has

  trapezoidal space distribution and is stationary in space.
  triangular space distribution and rotates at the speed of armature.
  triangular space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.

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