The collecting ring is also called slip ring, conductive ring, confluence ring, collecting ring, rotating conductive joint and so on. It can be used in any request for continuous rotation at the same time, but also from the fixed position to the rotating position to transmit power and signal in the electromechanical system. Slip ring can improve system performance, simplify the system structure, to avoid the wire in the rotation process caused by sprains.

The collecting ring is composed of brush, conductive ring, insulating material, frame, precision bearing, shell, seal and other auxiliary parts. General brush materials are graphite, copper alloy, precious metals and other materials, contact materials with their own elastic deformation or spring pressure to ensure that the brush and the conductive ring between the reliable connection.

When the collector ring is in normal operation, the three-phase winding is shorted by the resistor drawn from the collector ring. On the symmetrical three-phase winding. Start-up, in the rotor winding into a starting resistor, to achieve the purpose of reducing the starting current. As the starting resistance can be segmented by section, the appropriate string into the starting resistor, you can make the starting torque to the maximum torque of the motor, shortening the start-up process.