Answer Posted / farha

Armature reaction for a dc generator:
Consists of 2 cases:1. when generator is operated without
load and 2. when generator is operated on load.

When generator is operated on no load only main flux(due to
poles) is produced.Now when load is applied,flux cuts
through the air gap and produces a counter flux due to
presence of armature.This flux caused by the presence of
armature distorts the main field flux,hence shifting the
magnetic neutral axis in the direction of rotation of the
generator.This causes heat loss.For a motor, the direction
of shifting of Magnetic Neutral axis is oposite to the
direction of rotation.
Since this loss occurs due to action of armature, it is
known as armature reaction.

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