The commutator in DC machines is the rotating cylindrical part of the machine that is placed at the end of the armature. It helps to collect current from armature conductors. A commutator takes the AC current from armature conductors and converts it to DC current and then serves the DC current to external load.
The commutator is made of hard-drawn wedged shaped copper segments that are insulated from each other using a thin layer of mica. A copper lug is used to connect the segments to armature conductors.