Principle of carbon brush
Carbon brushes are also called electric brushes. They are widely used in electrical equipment. They are used to transmit signals or energy between the fixed and rotating parts of some motors or generators. They are rectangular in shape and have metal wires installed in springs. , The carbon brush is a sliding contact part, so it is easy to wear and needs to be replaced and cleaned regularly.
The main component of the carbon brush is carbon. When working, it works like a brush on the rotating parts through the spring pressure, so it is called a carbon brush, and the main material is graphite.
Let's first understand the main material of carbon brushes, graphite. Graphite is a natural element. Its main component is carbon. The color is black, opaque, with semi-metallic luster, and the hardness is not high. Carbon, but the properties are very different, which is caused by the different arrangement of carbon atoms. Although graphite is composed of carbon, it is a high temperature resistant material. Its melting point reaches 3652 ° C. Using this high temperature resistant feature, graphite can be processed into a high temperature resistant chemical appliance crucible.
The electrical conductivity of graphite is very good, surpassing many metals, and it is hundreds of times that of non-metals, so it is manufactured into conductive parts such as electrodes and carbon brushes; the internal structure of graphite determines its good lubricity, and we often use it in rusted doors. Put pencil ash or graphite in the lock to make it easier to open the door. This should be the lubrication effect of graphite.