The Armature:

Fig:Armature

The Armature consist of a number of coils mounted on a shaft with the coil ends soldered to specific Commutator bars. The armature is actually an iron cored coil ,the core being made of laminations ,laminations are separated by fine coating of varnish on their surfaces.
The armature constructed with slots into which the armature coils are placed the active part of the armature coil is its horizontal section that fits into the slot. Sometimes a single conductor is used for each slot and in some motors two are used . the iron core of the armature is cylindrical, with the armature coil wound around the core and fitted into the slots on the outer horizontal surface. When current flows through the armature produces a magnetic field around it. The armature, then is an electromagnet. The armature coil are wound so that when one side of the coil under South Pole of the field coil , the other side is under the North Pole. It is a reaction between armature magnetism and the field’s magnetism that produces rotation of the armature Here field is another magnet which partially surrounds the armature . this magnet can be a permanent type or another electromagnet.