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

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

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Electrical Machines
In case of 3 - Φ IM, plugging means

  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.
  locking of rotor due to harmonics.
  pulling the motor directly on line without a rotor.

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