(1) The brushes conduct electricity to the commutator .

(2) One of the places you need them is in modern small motors which don't have a commutator .

(3) He went on to build an electric motor in 1832 and invented the commutator , an integral part of most modern electric motors.

(4) The commutator must switch current to the correct drive magnets in the correct direction at the correct time in order to produce desired rotor movement.

(5) You can see that the commutator is simply a pair of plates attached to the axle.

(6) Note how the commutator reverses the current each time the coil turns halfway.

(7) It may also increase efficiency of machines as there won't be frictional effects of brushes, commutators , etc, on the motor itself.