Electric Carbon Industry

Definition and Type of Motor

Motor is a kind of equipment that converts electric energy into mechanical energy. At present, it is divided into brush motor and brushless motor.

Brush Motor

Brush motor adopts mechanical commutation, the magnetic pole is fixed and the coil rotates. When the motor works, the coil and commutator rotate, the magnet (permanent magnet) and carbon brush do not rotate, and the alternating change of the coil current direction is accomplished by the commutator and brush which rotate with the motor. The brush slides on the coil junction head, like a brush brushing on the surface of an object, so it is called a carbon "brush".

Sliding between the brush and the coil will friction the carbon brush and cause loss. Therefore, it is necessary to replace the carbon brush regularly. At the same time, the alternation between the carbon brush and the coil wiring head will lead to electric sparks, electromagnetic breakage and interference with electronic equipment.

Adding appropriate amount of molybdenum disulfide can effectively improve the wear resistance of brushes.

Brushless motor

Full-name brushless DC motor, composed of motor body and driver. Brushless motor advantages: brushless, low interference, low noise, smooth operation, long life, low maintenance costs. But the cost of brushless motor is high and the overall output is low.

What are the main components of brushes?

The raw materials used in making electric carbon are three kinds: metal powder additives, carbon and graphite powder, and binders.

Due to the different metal powder additives, it can be divided into non-ferrous brushes (made of copper powder, silver powder, lead powder, tin powder and graphite), black brushes (made of pure graphite).

The brush with solid lubricant MoS2 as high altitude lubricant has the advantages of long service life, good commutation performance and low friction coefficient.

What is the proportion of lubricating and antifriction materials added to brushes?

Graphite, molybdenum disulfide and tungsten disulfide are commonly used friction reducing materials for brushes. Normal addition ratio is 2-3%. In theory, the higher the purity of the material, the less impurities, and the higher the conductivity.