What is the role of the carbon brush in power tools?

Specific role of carbon brush

1. The external current (excitation current) is added to the rotating rotor (input current) through the carbon brush;

2. Introduce the electrostatic charge on the large axis to the earth through the carbon brush (earth carbon brush)(output current);

3. Lead the large shaft (ground) to the protection device for ground protection of the rotor and measure the positive and negative voltage of the rotor to ground;

4. Change the direction of current (in commutator motor, brush also plays the role of reversing)

Except the induction AC asynchronous motor does not. Other motors have, as long as the rotor has a reversing ring have.

The principle of electricity generation is that the magnetic field cuts the wire and generates an electric current in the wire. A generator cuts wires by spinning a magnetic field. The rotating magnetic field is the rotor, and the cut wire is the stator.