what is armature reaction and interpole winding.why we use interpole winding?

Question

Accepted Answer

Armature reaction is the effect of magnetic field produced by armature current on the main magnetic field. Interpole winding is used to counteract this effect.

Armature reaction is the distortion of the main magnetic field due to the magnetic field produced by the armature current.
Interpole winding is a small winding placed in the pole faces of DC machines to counteract the effect of armature reaction.
Interpole winding produces a magnetic field that opposes the armature reaction and helps in maintaining a constant flux in the machine.
Interpole winding is used in DC machines to improve commutation and reduce sparking.
Interpole winding is also known as commutating winding.

what is armature reaction and interpole winding.why we use interpole winding?

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