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Rotary Joints for GigE (1000Base-T) with Large 300 mm Clear Inner Diameter

SPINNER has been developing and supplying capacitive contactless rotary joints for industrial applications for nearly 10 years. They are used in plants and machines for transferring data between a stationary structure and a rotating one.

This new contactless GigE rotary transmission solution now makes it possible for SPINNER to supply products with an especially large inner diameter for dependably transmitting Ethernet protocols across a rotating interface. The joints feature a clear inner diameter of 300 mm and enable reliable Gigabit-Ethernet-LAN transmission. This isn’t possible with conventional sliprings or other technologies.

SPINNER contactless capacitive rotary joint with 300 mm inner clear diameter

In applications in which lines, shafts, or drives occupy the central axis, this large clear inner diameter now also enables fault-free transmission of data. The possible uses include smaller CT scanners like those used for animals. Power for the data transmitter can be supplied (for example) via a pre-existing slip ring, which can now also be smaller since there is no longer any need for data rings.

The contactless data channels are implemented with rotating capacitive couplers and require no maintenance. This innovative solution also has the major advantage that the user no longer needs to deal with technical issues like impedance matching or crosstalk, a problem that can affect slip rings. These SPINNER rotary joints boast a bit error rate of BER ≤ 1x10^-12.

If you have any questions, please write to This email address is being protected from spambots. You need JavaScript enabled to view it. or call +49 89 12601-0 and we’ll be happy to answer them.

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