When the motor is working, the coil and commutator rotate, while the magnetic steel and carbon brush do not rotate. The alternating change of the coil current direction is completed by the commutator and brush rotating with the motor. In the electric vehicle industry, there are high speed brush motors and low speed brush motors. There are many differences between brushless motors and brushless motors. As you can see from the name, brushless motors have carbon brushes and brushless motors have no carbon brushes.
Brush motor is composed of stator and rotor. The stator has magnetic poles (winding type or permanent magnet type) and the rotor has windings. After being electrified, a magnetic field (magnetic pole) is formed on the rotor. Changing the position of the brush can change the direction of the fixed rotor pole included Angle (assuming that the stator pole is the starting side of the included Angle, the rotor pole is the other side, and the direction from the rotor pole to the stator pole is the rotation direction of the motor), thus changing the rotation direction of the motor.