An el­ectric motor is all about magnets and magnetism: A motor usesmagnetsto create motion. If you have ever played with magnets you know about the fundamental law of all magnets: Opposites attract and likes repel. So if you have two bar magnets with their ends marked "north" and "south," then the north end of one magnet will attract the south end of the other. On the other hand, the north end of one magnet will repel the north end of the other (and similarly, south will repel south). Inside an electric motor, these attracting and repelling forces createrotational motion. ­

Abrushis a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electricmotors, alternators and electric generators.

The Role of spit rings is to provide a path for the current provided to the motor to energize the armature windings of the rotor, in order to create a magnetic field to oppose that of the field windings of the stator. The more current in the windings, the stronger the magnetic field, the more torque on the shaft, so you want as much conductivity in your split rings, commutator and brushes as your motor can handle the current to provide the intended torque.