Explain what is armature reaction based on D.C generator?

Armature reaction is a phenomenon that occurs in a DC generator when current flows through the armature windings. When current flows through the armature windings, a magnetic field is created around the armature. This magnetic field interacts with the main magnetic field produced by the field windings, causing a distortion in the main magnetic field.

This distortion in the main magnetic field is known as armature reaction. It can cause a shift in the neutral plane of the generator, where the induced voltage is zero, and can also affect the voltage regulation and efficiency of the generator.

To counteract the effects of armature reaction, compensating windings or interpoles can be added to the generator. These windings produce a magnetic field that opposes the distortion caused by the armature reaction, helping to maintain a more stable main magnetic field and improve the performance of the generator.