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

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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.To get more news about rotary joint, you can visit grandslipring.com official website.

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.
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.
As we said, the most dangerous thing is the seriousness of the breakdowns that it can generate. In the case of the electrospindle that we are commenting on and we use as a model, all the possible damages that a fault like the one we are describing could cause have been produced. When this failure occurs, the first thing that will happen is that the leaking water passes through the encoder and can completely damage it, forcing it to be replaced. We see in the images the oxidation on the surfaces of the encoder.

After the encoder, since the electrospindle is mounted vertically, the water would continue to descend due to the effect of gravity towards the winding, which is the next element. Although the winding in these motors is JUNTA ROTATIVAencapsulated, precisely to increase the protection, if the water is in a continuous passage through the winding, in the end it will also damage it.

Obviously, this continuous circulation of water inside the winding will also affect the rotor. In the images we can see the state of degradation that both the stator and the rotor present. You can clearly see the moisture inside the stator and obvious signs of oxidation on all surfaces.

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