A slip ring, also known as a rotary electrical interface, is a device that allows for the transmission of electrical power and signals from a stationary part to a rotating part.
In an AC generator, the slip rings are used to transfer electrical power from the stator to the external circuit.
The slip rings are mounted on the rotor shaft and are usually made of a conductive material such as copper or brass.
They are circular in shape and rotate along with the rotor. The slip rings are designed to make a sliding contact with the stationary brushes.
But there is a common generator in our life that is wind generator. The slip ring in wind generator is providing power to the motors that pitch the blades and also allowing communication to the hub.