what is armature reaction
A DC armature. In electrical engineering, an armature generally refers to one of the two principal electrical components of an electromechanical machine â generally in a motor or generator â but it may also mean the pole piece of a permanent magnet or electromagnet, or the moving iron part of a solenoid or relay.n a DC machine, the main field is produced by field coils. In both the generating and motoring modes, the armature carries current and a magnetic field is established, which is called the armature flux. The effect of armature flux on the main field is called the armature reaction.