What is the role of carbon brushes in micro DC motors?

In the micro DC motor, there will be a pair of small brushes, which are installed in the back cover of the micro DC motor, generally carbon material (carbon brush) or metal material (precious metal brush). Indispensable, so what is the role of this carbon brush in the micro DC motor?

Whether it is a generator or a micro DC motor, there will be a rotor and a stator, and the rotor will be excited and rotated, so it is necessary to use a carbon brush at one end of the rotor to conduct electricity, but the carbon brush will have friction, and regular maintenance and replacement are required for relatively large DC motors.

In fact, as a sliding contact, carbon brushes are not only used in micro DC motors, but also in many electrical equipment. The appearance of carbon brushes is generally a square, which is stuck on the metal bracket at the bottom of the micro DC motor. , Press the carbon brush on the rotating shaft with a spring, when the micro DC motor is rotating, the electric energy is transmitted to the coil through the commutator.

The main function of the carbon brush is to change the direction of the current, through the commutator to make the micro DC motor rotate continuously. Carbon brushes are almost always used in micro DC motors that require high speed and long life.

Summary: Carbon brushes are consumables. As a sliding contact body for exporting and importing current, they are an important component of brushed micro DC motors.