Customer Services

As the leading electrical slip rings supplier in the worldwide, AOOD have three cores: technology, quality and satisfaction. They are just the reason that why we can be the leader. Advanced technology and superior quality ensure the competitive power of AOOD, but the full and perfect service makes customers rely on us.

The key of customer service at AOOD is professional, fast and precise. AOOD service team are well trained, possess skilled professional know-how and good service attitude. Any problem the customer mentioned, it would be responded within 24 hours whether before-sale or after sale.

Quality Assurance Warranty

All AOOD slip ring assemblies units are guaranteed for one year except special products, which allows you to return any defective part for a replacement in one year from the date of original purchase on invoice,
1. If any defect is discovered in materials and/or workmanship, which results in quality failure.
2. If the slip ring is damaged through improper package or transportation.
3. If the slip ring can’t work normally under normal and proper use.
NOTE: If slip ring assemblies are expected to be used in an awful or a corrosive environment, please make clear statements to us, thus we can make the products specially treated to meet your particular expectation.

Model Selection

What is a slip ring

A slip ring is an electromechanical device which in combination with brushes that allows the transmission of power and electrical signals from a stationary to a rotating structure. Also called a rotary electrical joint, collector or electric swivel, a slip ring can be used in any electromechanical system that requires unrestrained, intermittent or continuous rotation while transmitting power, analog, digital, or RF signals and/or data. It can improve mechanical performance, simplify system operation and eliminate damage-prone wires dangling from movable joints.

While the primary goal of the slip ring is to transmit power and electrical signals, the physical dimensions, operating environment, rotating speeds and economic constraints often affect the type of packaging that must be employed.
The customer’s requirements and cost objectives are critical elements in driving the decisions that lead to the development of a successful slip ring design. The four key elements are:

· electrical specifications
· mechanical packaging
· operating environment
· cost

Electrical Specifications

Slip rings are used to transmit power, analog, RF signals and data through a rotating unit. The number of circuits, types of signals, and the electrical noise immunity requirements of the system play an important role in the determination of the physical design constraints imposed upon the slip ring design. High power circuits, for example, require larger conductive paths and greater spacing between the paths to increase dielectric strength. Analog and data circuits, while physically narrower than power circuits, also require care in their design to minimize the effects of cross-talk or interference between signal paths. For low speed, low current applications a gold-on-gold brush/ring contact system may be employed. This combination produces the smallest packaging configurations as shown in AOOD compact capsule slip rings. For higher speed and current needs the incorporation of composite silver graphite brushes and silver rings are used. These assemblies normally require larger package sizes and are shown under through bore slip rings. Using either method most slip ring circuits exhibit changes in dynamic contact resistance of approximately 10 milliohms.

Mechanical Packaging

The packaging considerations in designing a slip ring are often not as straightforward as the electrical requirements. Many slip ring designs require cabling and installation shaft or media to pass through the slip ring. These requirements often dictate the unit’s inner diameter dimensions. AOOD offer a variety of through bore slip ring assemblies. Other designs require a slip ring to be extremely small from a diameter stand-point, or from a height standpoint. In other cases, the space available for the slip ring is limited, requiring the slip ring components be provided as separate, or that the slip ring be integrated with a motor, position sensor, fiber optic rotary joint or RF rotary joint in an integrated package. Based on sophisticated slip ring technologies, AOOD enable all these complex requirements can be met in one complete compact slip ring system.

Operating Environment

The environment that the slip ring is required to operate under has an influence on the slip ring design in many ways. Rotational speed, temperature, pressure, humidity, shock & vibration and exposure to corrosive materials impact the bearing selection, exterior material selection, flange mounts and even cabling choices. As standard practice, AOOD utilizes lightweight aluminum housing for its packaged slip ring. Stainless steel housing is heavier, but it is necessary for marine, underwater, corrosive and other harsh environment.

How To Specify A Slip Ring

Slip rings are always part of a larger mechanism with a need to pass specific electrical power and signal circuits through a rotating surface. The mechanism the slip ring is part of operates in an environment such as an aircraft or a radar antenna system. Therefore, to create a slip ring design that will succeed in its application three criteria must be satisfied:
1. Physical dimensions, including attachment arrangement and de-rotating features
2. Description of circuits required, including maximum current and voltage
3. Operating environment, including temperature, humidity, salt fog requirements, shock, vibration
More detailed slip ring requirements include:
· Maximum resistance between rotor and stator
· Isolation between circuits
· Isolation from EMI sources outside the slip ring housing
· Starting and running torque
· Weight
· Data circuit descriptions
Common extra features that can be incorporated in a slip ring assembly include:
· Connectors
· Resolver
· Encoder
· Fluid rotary unions
· Coax rotary unions
· Fiber optic rotary joints
AOOD will help you to specify your slip ring need and select the optimum model for your design requirements.


1. What’s the difference of slip rings and rotary unions

Both slip rings and rotary unions are used to transfer media from a rotary part to a stationary part while rotating. But the media of slip rings is power, signal and data, rotary unions’ liquid and gas.

2. How about the warranty of AOOD electrical rotating products

AOOD have one year warranty for all electrical rotating products. If any unit doesn’t work well under normal work environment, AOOD will maintain or replace it for free.

3. How do I select the right slip ring model for my application

The number of circuits, current and voltage, rpm, size limit will determine which model of AOOD slip ring needed. Additionally, we will consider your actual application (vibration, continuous working time and type of signal) and make the exact solution for you.

4. Why should I select AOOD TECHNOLOGY as our slip rings partner What’s your advantage

The aim of AOOD is to satisfy customers. From initial design, material selection, production, testing, package and last delivery. We always offer the best service and make sure our customers can get the best quality products in shortest time.

5. How will AOOD prevent slip ring from signal interference

AOOD engineers will prevent signal interference from below aspects:
a. Increase the distance of signal rings and other powers rings from internal of slip ring.
b. Use special shielded wires to transfer signals.
c. Add outside shield for signals rings.

6. What’s AOOD delivery time once an order is placed

We have stock reasonable quantities for most standard slip rings, so delivery time is usually within one week. For new slip rings, we probably need 2-4 weeks.

7. How should I mount the slip ring with through bore

Usually we mount it by installation shaft and set screw, we can add flange to match your installation if you need.

8. For dual-band 2-axis digital marine satellite antenna system, can you recommend some suitable slip ring solution

AOOD have offered many kinds of slip rings for antenna systems, including marine antenna systems and on the road antenna systems. Some of them are required to transfer high frequency signal and some of them need higher protection degree, for example IP68. We all have done it. Please contact AOOD for your detailed slip rings requirements.

9. With the increasing of new technology, more advanced slip rings are required to transfer special signals. Which signals can be transferred by AOOD slip rings

With years’ R&D and cooperation experience, AOOD slip rings have been successfully transferred simulate video signal, digital video signal, high frequency, PLD control, RS422, RS485, Inter Bus, CanBus, Profibus, Device Net, Giga Ethernet and so on.

10. I’m looking for a slip ring to transfer 1080P and some other common signals channels in small structure. Can you offer something like it

AOOD have developed HD slip rings for IP cameras and HD cameras which can transfer both HD signal and common signals in compact capsule slip ring frame.

11. Do you have something that can transfer 2000A or higher current

Yes, we have. AOOD electrical rotating connectors are just used to transfer high current.

12. If slip ring need high protection degree, such as IP66. Is the torque huge

With advanced technology and special treatment, AOOD can make a slip ring not only IP66 but also pretty small torque. Even a big size slip ring, we enable it work smoothly with higher protection too.

13. For a ROV project, we need a couple of rotary joints which can transmit single mode fiber optic signal and power under deep sea, can you offer something like that

AOOD had successfully offered plenty of rotary joints for ROVs and other marine applications. For marine environment, we corporate fiber optic rotary joint into electrical slip ring, to transmit fiber optic signal, power, data and signal in one complete assembly. Additionally, we fully take into account of the use condition, the housing of slip ring will be made of stainless steel, pressure compensation and protection class IP68 will be adopted too.

14. Hi, our team is designing a robotic project, we need some robotic rotary joints to solve cable problems, let me know what you can do for it.

In robotic application, slip ring is known as robotic rotary joint or robot slip ring. It is used to transmit signal and power from base frame to robotic arm control unit. It has two parts: one stationary part is mounted on the robot arm, and one rotating part mounts to the robot wrist. With a robotic rotary joint, the robot can achieve endless 360 rotation without any cable problems.

According to the specifications of robots, robotic rotary joints range widely. Usually a complete robot will need several robot slip rings and these slip rings probably are with different requirements. Till now, we have already offered compact capsule slip rings, through bore slip rings, pan cake slip rings, fiber optic rotary joints, electro-optic rotary joints and custom rotary solutions for robotics.

15. Your slip ring solution sounds good, but what tests will you do How do you conduct

For common slip ring assemblies, such as AOOD small size compact slip rings, we will test operating voltage and current, signal, torque, electrical noise, insulation resistance, dielectric strength, dimension, materials and appearance.
For military standard or other special high requirement slip rings, such as high speed and those will be used in underwater vehicles, defense & military and heavy-duty machinery slip rings, we will conduct mechanical shock, temperature cycling, high temperature, low temperature, vibration, humidity, signal interference, high speed tests and so forth. These tests will be in accordance with US military standard or specified test conditions by customers.

Model Selection

A slip ring is an electromechanical device which in combination with brushes that allows the transmission of power and electrical signals from a stationary to a rotating structure.

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