The carbon brush of the generator is also referred to as the electrical brush, as a result of its material is "carbon", so it is usually known as "carbon brush" The function of the carbon brush is to provide the exterior energy source (usually a DC excitation current) of the generator to the winding (excitation winding) of the rotor during the slip ring at the collector ring In this way, when the rotor rotates, the DC recent flowing in will preserve flowing from one finish of the rotor, so that the generator rotates in a single course The carbon brush is hooked up with the ability supply to produce electric calories for the rotor