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Slip Ring - Rotocap |
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| Product features |
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- Non-contacting, capacitive data transmission
- Data transmission rates up from 50 Mbit/s to 1.25 Gbit/s
- Low bit error rate < 10-12
- High resistance against EMI and ESD
- Compatible with all standard transmission protocols
- Suitable for integration into other slip ring systems
- Suitable for combination with rotary unions for media
- Compact design with free inner bore
- Larger diameters up to 500 mm available
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Design and function
Our capacitive ROTOCAP slip rings facilitate uni- and bi-directional high-speed data transmission between fixed and rotating parts with up to Gigabit Ethernet rates. Data transmission is based on a non-contacting capacitive transfer technology. Thanks to the innovative electronics devised for the capacitive transfer, the slip rings can be designed to very compact dimensions while maintaining a high level of robustness. The patented technology allows high-speed data transmission at extremely low bit error rates better than 10-12. In addition, ROTOCAP slip rings are highly resistant against external interference. The technology is independent of the rotational speed and maintenance-free.
The design of the capacitive slip rings is modular, thus allowing a simultaneous and bi-directional use of multiple channels. All standard DC-free protocols such as Fast Ethernet, Video or Fibre Channel can be transmitted.
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Applications
The continuously increasing transmission rates in many application areas require high-performance slip ring systems able to handle Gigabit data rates. Being highly resistant against electromagnetic interference, our ROTOCAP capacitive slip rings ensure a reliable transmission of data at high speeds even in environments with strong electric and magnetic interference. In wind turbines, our capacitive transmission link ensure a reliable transmission of data between any bus systems. They also ensure the real-time transfer of measuring and control signals provided e.g. by the various sensors currently used in rotor blades.
As the data volumes transmitted in bus systems are continuously increasing, products will be required for new applications whose demands can no longer be met by slip rings using conventional contact technology. Further areas of application of our capacitive slip rings are medical sytems, automation industry, radar and surveillance systems as well as offshore and marine technology.
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Versions
The flexible design of the non-contacting capacitive electronic components allows a wide range of potential configurations. There are no restrictions to the number of transmission channels or the installation space. ROTOCAP components can be realised in very small, but also in larger dimensions (Ø 50 - 500 mm). All other GAT slip ring systems can be combined with the capacitive non-contacting ROTOCAP transmission in one housing.
The combination with the media rotary unions available is also possible without any problem. Thanks to the modular design, customer-specific configurations can be realised very easily.
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Comparison of slip ring technology using contacts vs.
contactless capacitive ROTOCAP technology
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| ROTOCAP |
with contacts |
contactless |
| Housing diameter ØG [mm] |
70, 110, 160, ... 500 |
| Number of poles (max.): |
1 ... 300 |
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| Number of uni-directional channels (max.): |
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16
= 4x Gigabit-Ethernet
= 8x Fast-Ethernet |
| Supply voltage [VDC] |
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5 |
| Bit error rate (max.): |
< 10-9 |
< 10-12 |
| Data rate |
max. 50 Mbit/s |
50 Mbit/s – 2.5 Gbit/s |
| Rated current (max.): [A] |
up to 500 |
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| Peak current (max.): [A] |
2x IN for 1s |
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| Operating voltage (max.): [V] |
750 |
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| Insulation resistance @500 VDC [MΩ] |
1000 |
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| Rotational speed (max.): [RPM] |
200 ... 500 |
unlimited |
| Installation position |
vertical / horizontal |
| Torque (Nm) |
< 6 |
0 |
| Operating temperature range [°C] |
0 to +70 |
| Protection class |
IP 64 (IP 65) |
| Lifecycle, typical [mil. rotations] |
100 |
unlimited |
| Service interval [mil. rotations] |
20 |
maintenance-free |
| Air connection ["] (optional) |
G 3/8 or G 1/2 |
| Air pressure (max.): [bar] |
10 |
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