Slip ring

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A slip ring (in electrical engineering terms) is a method of making an electrical connection through a rotating assembly. Slip rings, also called rotary electrical interfaces, collectors, swivels or electrical rotary joints, are commonly found in electrical generators for AC systems and alternators.

A slip ring consists of a conductive circle or band mounted on a shaft and insulated from it. Electrical connections from the rotating part of the system, such as the rotor of a generator, are made to the ring. Fixed contacts or brushes run in contact with the ring, transferring electrical power or signals to the exterior, static part of the system.

This system is similar to the brushes and commutator found in many types of DC motors. While commutators are segmented, slip rings are continuous, and the terms are not to be used interchangeably. Slip rings can also be used where electrical power or signals need to be transferred to a rotating device, such as an aerodrome beacon, rotating tank, or radio telescope. Rotary transformers are often used instead of slip rings in high speed or low friction environments.

Notable manufacturers of slip rings include: Air Precision (Paris, France), Trolex Engineering (UK), Michigan Scientific Corp. (USA), MORGAN-REKOFA, Moog Components Group, and Schleifring of Germany. Electro Miniatures of Moonachie, New Jersey and Airflyte Electronics of Bayone, New Jersey are also suppliers of all sizes of slip rings.