Capsule slip ring, Through Bore slip ring, Pancake slip ring and More Explained - slip ring supplier Types of Slip Rings: Capsule, Through Bore, Pancake and More Explained

Slip rings are essential electromechanical devices that enable the transmission of power and signals from a stationary structure to a rotating one. They are widely used in wind turbines, robotics, packaging machinery, medical devices, and many other fields where 360° rotation is required.

However, not all slip rings are the same. Depending on the design and application, slip rings can be classified into several types, each with unique advantages. In this guide, we will explore the most common slip ring types—capsule, through bore, pancake, high current, high speed, waterproof, and hybrid slip rings—and explain how to choose the right one for your project.

1. Capsule Slip Rings

Capsule slip rings are compact and lightweight, making them ideal for applications where space is limited.

Features: Small size, supports low current and signal transmission, typically up to 56 circuits.
Applications: CCTV cameras, medical devices, instrumentation, and drones.
Advantages: Easy installation, cost-effective, and stable signal transmission.
Limitations: Not suitable for high current or large rotating machinery.

2. Through Bore Slip Rings

Through bore slip rings have a hollow shaft design, allowing cables, pipes, or mechanical shafts to pass through the center.

Features: Large inner diameter (from 2mm to 500mm+), supports both power and data transmission.
Applications: Wind turbines, packaging machines, robotics, and industrial equipment.
Advantages: Flexible design, allows integration with pneumatic or hydraulic systems.
Limitations: Larger size compared to capsule slip rings.

Related Product: Through Bore Slip Rings

3. Pancake Slip Rings

Pancake slip rings use a flat disc structure instead of a cylindrical one, making them suitable for height-limited installations.

Features: Flat and compact, available in both power and signal transmission versions.
Applications: Military radar systems, aerospace, robotics, and medical equipment.
Advantages: Saves vertical space, allows higher circuit density.
Limitations: Higher electrical noise, shorter service life compared to other designs.

4. High Current Slip Rings

High current slip rings are designed to handle large currents, ranging from 100A up to several thousand amps.

Features: Stronger contacts, often combined with silver or gold-plated rings for durability.
Applications: Welding equipment, heavy-duty machinery, marine cranes, and mining equipment.
Advantages: Reliable power transmission in harsh environments.
Limitations: Bulkier design and higher cost.

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5. High Speed Slip Rings

When rotational speeds exceed 500 RPM, high speed slip rings are required.

Features: Special precision design to reduce wear and minimize electrical noise.
Applications: Aerospace, defense systems, high-speed inspection equipment.
Advantages: Stable operation under high rotation.
Limitations: Higher manufacturing cost.

Related Product: High Speed Slip Rings

6. Waterproof Slip Rings

Waterproof slip rings are designed to operate in harsh environments with dust, moisture, or underwater conditions.

Features: Protection level up to IP68, resistant to corrosion and water ingress.
Applications: Marine equipment, offshore wind turbines, underwater robots (ROVs).
Advantages: Long lifespan in extreme conditions.
Limitations: Customization may increase cost.

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7. Hybrid Slip Rings

Hybrid slip rings combine electrical transmission with other media, such as optical signals, Ethernet, pneumatic, or hydraulic lines.

Features: Multi-functional, customizable for specific projects.
Applications: Robotics, medical devices, automation systems.
Advantages: Saves space, integrates multiple functions in one unit.
Limitations: Requires precise engineering design.