In order to keep the DC brushed motor rotor spinning, the direction of the current needs to be constantly changed. This is done through a device called a commutator or commutation ring. The commutator changes the direction of the current, causing the polarity of the magnetic field to change, which continues to drive the rotor to rotate.
The working principle of brushed DC motor is that the magnetic field generated by the current between the stator coil and the rotor coil interacts, causing the rotor to start rotating. The commutator continuously changes the direction of the current to keep the rotor rotating. This motor has a simple structure and high reliability, and is widely used in various fields.
https://www.duowei-motors.com/