Brushes play a vital role in electric motors. It not only ensures the stable conduction and commutation process of the current, but also protects the internal components of the motor, reduces friction and wear, reduces noise and improves efficiency. Through reasonable design, installation and maintenance, the brushes can ensure the long-term stable operation of the motor, prolong the service life of the motor, and improve the safety of the motor to a certain extent. Therefore, the quality and maintenance of the brushes directly affect the overall performance and reliability of the motor.