Discussion
Damper winding is used in a synchronous motor for __________.
Answer: B
Damper winding is used for eliminating hunting of the rotor.
The damper (amortisseur) winding is a set of copper bars in the pole faces, short-circuited at the ends. When the rotor runs exactly at synchronous speed no emf is induced in it. If the rotor oscillates about synchronous speed (hunting), currents are induced in the bars and produce a torque that opposes the oscillation and damps it. The same winding also lets the motor start as an induction motor.
It is not provided to raise efficiency, to limit temperature rise or to improve the power factor, which is controlled by the field excitation.
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