Introduction
Through-bore slip rings are widely used for industrial automation, wind turbines, and packaging machinery. In different applications, their specifications vary a lot. Do you know how to choose the right one? In this guide, ByTune will walk you through the common technical specifications of the hollow shaft slip rings to help you select the most suitable option.
Why Technical Specifications Matter
Understanding the specifications of through-hole slip rings helps us prepare for purchase, by:
• Ensures slip ring compatibility with your equipment (inner diameter, outer diameter).
• Meets the working requirements (current rating, voltage, rotational speed).
• Guarantees reliable operation and extends service life.
• Helps compare suppliers and save costs.
• Avoids downtime and costly replacements.
Key Technical Specifications of Through-bore Slip Rings
Understanding the specifications of through-hole slip rings can help you select the right model for your application. Below are the main parameters to consider:
1. Hole Diameter (Bore Size)
The inner diameter typically ranges from 12.7mm (½ inch) to over 100mm. Slip rings with the correct bore size can be mounted directly on rotating shafts or pneumatic/hydraulic lines. Common sizes include 25.4mm, 38.1mm, 50mm, and 100mm.
Example:
• 25.4mm for compact automation systems.
• 100mm for large industrial machinery or wind turbines.
2. Outer Diameter and Length
The overall size affects how much space the slip ring requires for installation. While compact designs save space, larger models allow for more circuits or higher current ratings. At ByTune, we offer slip rings with ODs from 18 to 800mm and use large custom bearings to ensure stability.
3. Current and Voltage Ratings
Typically, the rated current of through-hole slip rings are available in the following different configurations:
• Signal rings: typically 2A–5A at low voltage
• Power rings: 10A–50A or higher, at up to 600V AC/DC
High-current slip rings are used in welding equipment, rotary tables, and heavy machinery.
4. Number of Circuits (Channels)
It comes from 6 to 100+ circuits, depending on the application. Each circuit can transmit power, control signals, or data. Some applications require a mix of signal and power channels-customization is often necessary.
5. Signal Compatibility
Modern slip rings support the transmission of various signal types, including:
• Ethernet
• RS485
• CAN bus
• USB
• HD-SDI
Generally speaking, the shielding and contact material determine the signal loss and crosstalk of through-hole slio rings.
6. Rotational Speed (RPM)
Most through-bore slip rings operate reliably at speeds up to 250RPM. ByTune's high-speed versions (up to 1000RPM or more) are available for specialized applications. But compared to the normal ones, they require more advanced materials and precise engineering.
7. Contact Resistance
The contact resistance of through-bore slip rings is usually between a few milliohms and several tens of milliohms. For precision applications, it should be less than 7 milliohms, just like ByTune's slip rings.
8. Temperature Range and IP Rating
Standard models commonly work in -20°C to +80°C environments. But for food processing machines or outdoor devices, the standard should be higher.
9. Protection Level
The IP rating indicates the dustproof and moistureproof performance of the slip ring, such as IP54, IP65, IP66, or higher. They can withstand water, dust, and mud attacks, especially in outdoor or industrial applications.
How to Choose the Right Through Hole Slip Ring?
Consider these factors when selecting a through-bore slip ring:
1. Installation Dimensions: Match the bore size and outer diameter with your shaft or housing.
2. Circuit Requirements: Count the number of power and signal paths you need.
3. Signal Sensitivity: For high-frequency or low-voltage signals, choose the low-noise(contact resistance) slip rings.
4. Current Load: Ensure each ring can handle the expected amperage. Split the load across multiple rings if needed.
5. Environment: For dusty, wet, or corrosive conditions, ask about high IP-rated and sealed options.
💡 Looking for high-current or high-speed models? Check the BTH50120 series →
FAQs
Q: What is the difference between through-hole and capsule slip rings?
A: Through-hole slip rings have a hollow center, ideal for installations with rotating shafts. Capsule slip rings are compact and used when space is limited.
Q: Can I customize its number of channels or the current rating?
A: Yes, ByTune offers full OEM customization for its slip rings, including the circuit number, voltage, current, and connectors.
Q: What materials are used for contact brushes?
A: We commonly use gold-gold or silver-silver contacts to ensure low electrical noise and long life.
Q: Can I customize the bore size or connector type?
A: Of course. BT Slip Ring supports OEM/ODM customization for bore diameter, circuit configuration, wiring length, connectors, and more.
Conclusion
Choosing the right slip ring depends on understanding your specific requirements, including the shaft size, number of circuits, signal type, speed, and environmental conditions.
Get Your Custom Through Hole Slip Ring Solutions
As a leading manufacturer of through-bore slip rings, ByTune offers both standard and customized products, backed by over 20 years of expertise. If you encounter any challenges in selecting the right slip ring, feel free to consult our team. Whether you're working on a compact automation setup or a high-current wind power system, we offer the right configuration to fit your needs.