First, the role of brush in all areas of the national economy, the motor is widely used in industry, agriculture and transportation and other aspects. Before and after 1889, began to brush motor, it plays a role in the current export or import motor, the motor commutator, brush also plays a role in reversing. Today, with the rapid development of the motor industry, the manufacturing technology of motor brush is becoming more and more perfect, the performance is improved significantly, and the varieties are increasing. There are many new high-performance brushes. Although the size of the brush is small and the price is cheap, it plays an important role in the motor. It is often compared to the heart of the motor. An electric brush, also called a brush, brush, or carbon brush, is used to conduct current between a stationary component of a motor and a rotating component, a commutator or a collector ring. The brush is widely used in large medium and small synchronous motors, generators, small electric tools, DC motors and other equipment, the object is in direct contact with slip rings or commutator, reasonable selection and collocation can improve the reliability of the motor work for them. Two, brush classification 1, according to raw materials classification, brush according to different raw materials can be divided into carbon brush and metal brush 2 major categories. Carbon brush with carbon black, graphite or coke and other general carbon material (element symbol C, atomic number 6) as the main raw material. The metal brush is mainly made of copper powder, silver powder or other metal materials and graphite. It is usually called metal graphite brush or metal brush. All kinds of graphite indicate symbol bits: natural graphite is S. Electrographite is D, the first 1 digits, 2 expressed as graphite based said Coke base, 3 carbon black, expressed as 4 expression for the charcoal based, the digital sequence number. Such as the brush type D374D said its electrographite, carbon black, order No. 74D brush. Metal graphite is J, the first 1 digits represented as binder-free, 2 hit the adhesive, the digital sequence number. An electric brush, such as type J204, represents an electric brush with a metallic graphite, a binder and an order number of 04. In addition, there are some new models, such as R series, resin bonded graphite brush, L series carbon graphite brush, and Y series hard carbon brush. 2, according to the use of classification, brush classification by use is quite difficult. This is because the motor brush motors and generators, DC and AC, large and small distinction, and use conditions in different speed, reversing characteristics, current and voltage, so it is difficult for the classification by use of uniform brush. In addition, the characteristics of various types of brushes fluctuate with a wide range of manufacturing conditions (mainly the ratio of raw materials), so it is not appropriate to limit the suitability of a particular range of brushes.

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