A carbon brush for an electric motor is an electrical contact which conducts current between the stationary and moving parts of the motor. These motor parts are seated in holders and are positioned above the rotation commutator or slip ring. Carbon Brush applications include their use in electric motors and generators.
The term “carbon brush” appeared in electrical engineering history with the change to materials actually made from copper wire, which looked like a whisk brush, to graphite and carbon. Carbon brushes have been evolving for decades. Today, they remain indispensable hardware for DC electrical rotating machines.