The damper winding in an alternator reduces the hunting in alternators operating in parallel.
The basic construction of damper winding involves short-circuited copper bars that are embedded in the pole-faces of the salient-pole rotor.
Whenever hunting occurs, there is a shifting of the armature flux across the pole
faces, thereby inducing currents in the damper winding. Since any induced current opposes the action that produces it (Statement of Lenz’s law), the hunting action is opposed by the flow of induced currents.
That was all about role of Damper Windings in Alternators