Armature electrical

In electrical engineering, the armature is the winding (or set of windings) of an electric machine which carries alternating current. The armature can be on either the rotor (rotating part) or the stator (stationary part), depending on the type of electric machine. Armature windings conduct AC even on DC machines, due to the commutator action (which periodically reverses current direction) or due to electronic commutation, as in brushless DC motors. The word armature was first used in its electrical sense, i.e. keeper of a magnet, in mid 19th century. The effect of an armature flux on the main field flux is called "armature reaction" Armature reaction is essential in amplidyne rotating amplifiers.Armature reaction drop is the effect of a magnetic field on the distribution of the flux under main poles of a generator. The pole piece of a permanent magnet or electromagnet and the moving, iron part of a solenoid, especially if the latter acts as a switch or relay, may also be referred to as armatures.