The specific role of carbon brushes

Carbon brushes, also called electric brushes, are widely used in many electrical equipment as a sliding contact. The main materials used for carbon brushes in products are graphite, greased graphite, and metal (including copper, silver) graphite. A carbon brush is a device that transmits energy or signals between the fixed part and the rotating part of a motor or generator or other rotating machinery. It is generally made of pure carbon and coagulant. There is a spring to press it on the rotating shaft. When the motor rotates, the electric energy is sent to the coil through the commutator. Because its main component is carbon, called carbon brush, it is easy to wear. It should be regularly maintained and replaced, and the carbon deposits should be cleaned up.
1. The external current (excitation current) is applied to the rotating rotor through the carbon brush (input current);
2. Introduce the static charge on the large shaft to the ground through the carbon brush (ground carbon brush) (output current);
3. Lead the large shaft (ground) to the protection device for rotor grounding protection and measure the positive and negative voltage of the rotor to ground;
4. Change the current direction (in commutator motors, the brushes also play a commutation role).
Except for the induction AC asynchronous motor, there is no. Other motors have it, as long as the rotor has a commutation ring.

The principle of power generation is that after the magnetic field cuts the wire, an electric current is generated in the wire. The generator cuts the wire by letting the magnetic field spin. The rotating magnetic field is the rotor and the wire being cut is the stator.