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Commutator reverses direction of the coil every half turn so that the coil keeps turning in the same direction.The commutator is made from two round pieces of copper,one on each side of the spindle. A piece of carbon (graphite) is lightly pushed against the copper to conduct the electricity to the armature. The carbon brushes against the copper when the commutator spins.As the motor rotates, first one piece of copper, then the next connects with the brush every half turn. The wire on the left side of the armature always has current flowing in the same direction, and so the armature will keep turning in the same direction is a simple and device for reversing the current direction through an armature every half turn.Commutator reverses direction of the coil every half turn so that the coil keeps turning in the same direction.