Basic introduction to slip ring

Update:23 Mar 2019
Summary:

The slip ring is the electrical component responsible f […]

The slip ring is the electrical component responsible for communicating and transmitting energy and signals to the rotating body. According to the transmission medium, the slip ring is divided into an electric slip ring, a fluid slip ring, a smooth ring, and can also be collectively referred to as "rotary connection" or "swirl". The slip ring is usually installed in the center of rotation of the device and consists mainly of two parts, rotating and stationary. The rotating part connects the rotating structure of the device and rotates with it, called the "rotor". The stationary part connects the energy of the fixed structure of the device, called the "stator".

Slip rings, also known as rotating electrical interfaces, electrical rotating joints, can be used in any electrical system that requires unrestricted continuous rotation to transmit power and data signals from a fixed structure to a rotating structure.
A device for transmitting electrical signals and electrical energy between a rotating member of a antenna mount and a stationary member by sliding or rolling contact, electrostatic coupling or electromagnetic coupling of the conductive member. There are drive elements, measuring elements and control elements on the rotating parts, which must be supplied with control signals and power from the machine room. This requires a variety of slip ring assemblies to transmit signals and energy. Some radars need to rotate more than one hundred lines. The slip ring assembly can be classified according to the frequency of the transmission signal: a low frequency slip ring, an intermediate frequency slip ring and a high frequency rotating hinge. Slip rings are usually only referred to as the first two. The electrical performance specifications of the slip ring assembly are: insulation resistance, contact resistance, dielectric strength and crosstalk. For the IF slip ring, shielding, impedance matching, noise voltage, etc. should be considered because of the higher frequency. In the structural design, it is first necessary to ensure reliable contact and ensure that all lines are continuously connected. Therefore, the material used for the brush is required to have good electrical conductivity, the pressure of the slip ring is appropriate, the eccentricity and sway amount of the slip ring is small, the wear resistance is good, the friction torque is small, and maintenance is convenient.

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