What are the brushes used in DC motor?

The brushes used in DC motors are typically made of carbon or graphite. These materials are good conductors of electricity and can withstand the high temperatures and friction generated by the motor's operation.

The specific characteristics of the brushes, such as their size, shape, and composition, can vary depending on the specific application and motor design. Factors such as the motor's power output, operating conditions, and intended use can all influence the choice of brush material and design.

Other materials, such as copper, silver, and metal alloys, have also been used as brush materials in DC motors, particularly in high-performance or specialized applications. However, carbon and graphite remain the most common materials used in brush construction due to their excellent electrical and thermal properties, durability, and cost-effectiveness.

Overall, the choice of brush material and design is an important consideration in DC motor design and can have a significant impact on the motor's performance, lifespan, and maintenance requirements.