The purpose of embedding the damper winding in the pole face of a synchronous motor is to

• A. Eliminate losses on account of fair friction
• B. Reduce winding losses
• C. Reduce bearing friction
• D. Eliminate hunting and provide adequate starting torque

Answer: (D)

under steay state:
P= (E V sinδ)/ X
change in load on motor, δ adjust to new value
rotor oscillate about its final equilibrium load angle called hunting.
cause:
sudden change in load
fault in supply system
sudden change in field current
remedies:
using flywheel
using damper bar