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Which of the following is NOT a cause of hunting in a synchronous motor?
1. Change in load
2. Cyclic variation of load torque
3. Changes in field current
4. Change in supply frequency

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Correct Answer - Option 4 : Change in supply frequency

Hunting is the phenomenon that occurs in synchronous motors due to varying load.

Causes of hunting:

  • Periodic variation of load
  • Sudden changes in load
  • Faults occurring in the system when supplied by the generator
  • Sudden change in the field current
  • Cyclic variations of the load torque

 

Effects of hunting:

  • It can lead to loss of synchronism
  • It can cause variations of the supply voltage producing undesirable lamp flicker
  • The possibility of resonance condition increases. If the frequency of the torque component becomes equal to that of the transient oscillations of the synchronous machine, resonance may take place
  • Large mechanical stresses may develop in the rotor shaft
  • The machine losses increases and the temperature of the machine rises

 

Reduction of Hunting:

  • Use of damper windings
  • Use of flywheels

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