Question

What is the exact location of compensating winding?

(a) Across armature

(b) In series with armature

(c) Across armature or in series

(d) Cannot be determined

The question was asked by my college professor while I was bunking the class.

Question is from Ways to Reduce Effects of Armature Reaction topic in chapter Armature Reaction of DC Machines

Answer 1

Right option is (b) In series with armature

For explanation: By adding a compensating winding in the pole face plate which carries armature current in the opposite direction of current in the adjacent armature windings, the position of the flux at the pole face plate can be restored to the position it would have with zero armature current.