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Answer Posted / janani venkatesan
Most of the alternators have thir pole shoes slotted to
receive copper bars of a grid or damper windings.Copper
bars are short circuited at both ends by heavy copper
rings.These DAMPERS are useful in preventing hunting(speed
fluctuations) in generators and are needed in synchronous
motors to provide starting torque.Under normal running
conditions, damper windings does not carry any current
because rotor runs at synchronous speed.They tend to
maintain balanced 3phase voltage under unbalanced load
conditions.
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