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Armature reaction is effect of armature flux on main field flux.

Basically there are two windings in a dc motor - Armature winding (on stator) and field winding (on rotor). When we excite the field winding, it produces a flux which links with the armature. This causes an emf and hence a current in the armature. This current in armature produces another flux which lags the main flux. This is referred to as armature reaction. It has two effects on the machine:

1. Demagnetising effect: It reduces the strength of the main flux.

2. Crossmagnetising effect: Its effect is that it bends/distortes the the main flux line along the conductor

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