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 ship. Therefore, to create a slip ring design that will succeed in its application three criteria must be satisfied:
- Physical dimensions, including attachment arrangement and de-rotating features
- Description of circuits required, including maximum current and voltage
- Operating environment, including temperature, humidity, salt fog requirements, shock, vibration
More detailed slip ring requirements include:
- Maximum resistance between rotor and stator, usually expressed in milli-ohms
- Isolation between circuits, expressed in dB
- Isolation from EMI sources outside the slip ring housing, also expressed in dB
- Starting and running torque, expressed in in-lbs
- 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
Electro-Miniatures can help you identify the specific criteria you need to establish to ensure your slip ring meets your design requirements.
