What Is the Definition of a Slip Ring?

Slip rings are often used in motors.

A slip ring -- often known as an electric swivel or rotary electrical joint -- is a small mechanism used to electrically connect a stationary object to a rotating object.

Function

A slip ring comprises a conductive circle or ring that facilitates electrical connections from the rotating object, through brushes that rub against the outside of the ring.

Types

Products that use slip rings include wind turbines, aerospace propeller and optic systems, medical systems, cameras, air-conditioning systems and cable reels. The specific type of slip ring depends upon the environment in which it's used.

Features

Slip ring speeds vary from up to 50 revolutions per minute in a marine setting to 12,000 rpms in an industrial setting. They operate at a high range of temperatures, require little maintenance and can contain mercury or precious metal contacts.

Warnings

Slip rings can't be immersed in water unless enclosed in a protective case. Do not use mercury-wetted slip rings in mechanisms that come in contact with consumable items such as food or pharmaceuticals.

References

• Moog: Proven Slip Rings
• Progressive Engineering: How Does a Slip Ring Work?