The Rotating Electric collectors or Slip Rings are used to transfer power and electrical signals from a fixed structure to one in continuous rotation. The slip rings are made up of two parts: an external one called STATOR (because normally stationary) consisting of brushes of noble material (golden or silver copper) and an inner part called ROTOR (because normally rotating) consisting of rings also made of materials nobles. The operation is reversible, ie the external part, which is normally fixed, can be rotated and, consequently, the internal part (which normally rotates) can be kept fixed.
How is a slip ring made?
The slip rings are also known with terms such as: electric rotary joint, electric collector, electric joint or electrical joint. The main function of the slip ring is the transfer of signals or electric power from a fixed structure to a mobile, allowing a continuous rotation preventing the electrical conductors from being stressed by mechanical torsion.
Motion Control Products has paid special attention to the design and manufacture of the two elements that come into contact: the brushes and rings. The design elements include selection of precious materials, their relative thickness, the geometry, and the careful selection of the bearings. Together, this can provide an estimated service life of up to 50 million rotations. There are seven different types of slip rings available from standard catalogue:
AR / BR / CR series "Capsule" type: they are manifolds without through holes with diameter from 6.5mm up to 25 mm and number of circuits from 1 up to 76. Thanks to the gold-gold technology applied to the brushes and the rings, it allows the transfer of high frequency signals as well as the transfer of fieldbuses with up to 1G bandwidth used especially in video surveillance systems, in medical pharmaceuticals.
ER series "through-bore" type: as one of the most requested slip ring models, our ER series is characterised by the through hole with diameters from 12.7mm up to 700mm in the standard versions. It is possible to transmit very high power levels, even by paralleling multiple contacts and simultaneously bringing digital, analogue and fieldbus signals including Ethernet Realtime (EterCAT - Sercos III - Profinet - Eternet / IP - Ethernet Powerlink). The application sectors include Converting, Medical, Pharmaceutical, CN Machines, Packaging and more.
HR series "Faston" type: FASTON terminals are connectors that are widely used in electronic and electrical equipment for quick and easy connection. With diameters of 32 to 46mm and from 2 to 8 contacts, our HR series slip ring designed with FASTON terminals is able to carry analogue power and signal at the same time. They are ideal for Flowpack, packaging and rotary tables, thanks to the option with IP65 protection rating.
For special applications such as in the food industry, in machine tools, in rotary tables that require both an IP68 degree of protection and the steel casing, we have developed the collectors of "Water proof" slip rings including "Stainless Steel" and aluminium-alloy enclosure.
The rotating joints of BHR series, which are "Frameless", make it ideal in wind turbines applications. In fact in a small space we have concentrated a considerable power, having eliminated the outer casing are particularly economical.
A very interesting novelty is the PR series slip ring in a "Flat" shape format, which develop more on the diameter and contain the thickness.
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Please contact our technical sales team for pricing, datasheets, technical drawings (2D / 3D), hardware & software manuals or any other technical information for your applications...