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How to define a slip ring

ByTune Electronics Co.,Ltd | Updated: May 24, 2018

Normally, we can define a slip ring from below 5 side concern: 

1. Define the Mechanical Envelope of a slip ring 

The envelope is, of course, largely dictated by the space available in the system. The slip ring engineer should be given the maximum space available in the system so all existing candidate designs can be considered. It is imperative that the space required for the slipring be specified in the early stages of thesystem design and that it be consistent with the structural and electrical demands.

2. Define System Interface Requirements
The slip ring engineer will need to know these system interface considerations:
1. Can the slip ring mount directly on the center line or is a through-bore required in the slip ring? A through-bore can be used to mount the slip ring on a shaft or used for
routing hydraulic lines, pneumatic lines, fiberoptic rotary joint, wave guide. etc.
2. How will the slip ring attach to the system?
A slip ring must be mounted with a flexiblecoupling on one side of the unit. Hard mounting on both the rotor and stator will cause the slip ring to fail prematurely by translating system load into the slip ring bearing structure.
3. How should the electrical connections to the slip ring be made? Is it desirable to have connectors integral with the slip ring on both
the rotor and stator, or would flying leads onone or the other ends be desirable? And ifflying leads are preferred, should they exit therotor / stator in a radial or axial direction, and what length should the leads be?

3.Define Electrical Requirements

The specified current enables the slip ring engineer to propose a unit with the appropriate cross-sectional area of the rings,brushes and lead wires. The specified voltagedictates the spacing between adjacent rings and brushes. It is helpful in achieving the most cost effective and smallest practical envelope not to rate all circuits at the maximum level. For example, if you need 20 circuits total, three of which must carry ten amps, designate three for high current. Don’t insist on 100% functional interchangeability by specifying that all 20 circuits carry ten amps. And, if ten amps is a surge current with a continuous current of only two amps, tell us that, too. There is no reason for you to

pay for ten amps continuous capacity when you only need two amps.

Be aware that voltage surges and spikes are the major cause of system slip ring failures. Moog Components Group uses a conservative approach to circuit design, however, it is not uncommon in some power supply systems to see voltage spikes ten or more times the normal operating voltage. We strongly recommend surge protection on all power supplies.

Most smaller slip rings will satisfactorily conduct signals to 50 megabits / sec. Special slip rings can be used to pass broadband signals from DC to 1 gigahertz and data rates of 500 megabits or even higher. Cross-talk, insertion loss and bit error rate information can be projected, if tested for actual values, when data rates, formats and impedances are defined. The appropriate shielding techniques will be incorporated to meet the system requirements.

4.Define Mechanical Requirements

1. Operating speed (rpm) is an important design parameter. Almost any slip ring can operate successfully at speeds to 100 rpm although many applications only require operation at a few rpm. Slip rings are routinely used to instrument test jet turbine engines operating at speeds in excess of 20,000 rpm. The operating speed, in conjunction with the diameter, dictates the surface speed of the ring relative to the brush and hence the internal design approach and material selection.

2. What rotational life is necessary for your application? Will the unit oscillate or rotate at a continuous speed?

5. Define the Environment

The environment in which the slip ring must survive is a key factor. Operating temperature range is important in specifying the proper lubricant. And if the slip ring will operate exposed to the elements or to a hostile environment, integral seals must be included in the design. Any unusual shock or vibrationshould also be specified.

Your Slip Ring Requirements

For assistance on your slip ring requirements, please feel free to contact our staffs by then we would recommend  perfect slip ring or solution to you. 

ByTune Electronics Co.,Ltd