What are the dangers of sparks from the carbon brush of the car polishing machine?

Motor carbon brushes and slip rings are the largest conductive sliding contact parts of the motor. They are also the main equipment for dynamic and static contact and energy exchange. They are also an important part of the engine excitation system. During normal motor operation, the current flowing through the excitation carbon brushes often becomes unbalanced as the running time continues, the temperature of some carbon brushes will be too high. If the carbon brush temperature is too high, it will affect the surface structure of the carbon brush. Sparks will be generated at the contact surface between the carbon brush and the slip ring. In severe cases, this can cause a rimfire accident. and directly threaten the safe operation of the engine.