Design of damper winding
Damper windings are provided in the pole faces of salient pole alternators. Damper windings are nothing but the copper or aluminum bars housed in the slots of the pole faces.
The ends of the damper bars are short circuited at the ends by short circuiting rings similar to end rings as in the case of squirrel cage rotors.
These damper windings are serving the function of providing mechanical balance; provide damping effect, reduce the effect of over voltages and damp out hunting in case of alternators.
In case of synchronous motors they act as rotor bars and help in self starting of the motor.
Determination of full load field MMF
Full load field mmf can be taken as twice the armature mmf.