Slip ring is a product of the demand in the process of modern industrial development, which is a solution of making an electric connection through a rotating assembly between two rotating components. Slip ring is also called rotary electrical interfaces, rotating electrical connectors, comutator, collectors or electrical rotary joints. With the development of electronic control, etc , slip ring is developing in the direction of transferring not only current, but also the weak control signal; not only low frequency, but also the high frequency signal; not only low current, but also the high current; not only low speed, but also high speed. The slip ring is a pivotal part in the automated machine, such as Indexing Tables, Centrifuge, Instrumentation Inertial Reference Set, etc. Carbon brush slipring Slip ring is composed by electric brush, conducting ring, insulation material, frame, bearing, shell, sealing element and some auxiliary parts. Carbon brush, copper alloy, precious metal are general electric brush materials. Brush material is forced to keep touch with conducting rings. These Kontaktmaterials are used in different condition for their different characteristic. Key parameter of slip ring 1)Voltage 2)Current 3)Insulation resistance 4) contact resistance 5)The dynamic contact resistance 6)life of slip ring 7)operate speed 8) other