Peter P. wrote:
> Thilo Klein <ostentativ <at> arcor.de> writes:
>
>   
>> I want to design a slip ring system with concentric circles to
>> transmit 7 signals(ie 8 connectors). Do thou know a source(I prefer
>> books) which shows several methods of transmitting signals on rotating
>> elements ?!
>>
>> Diameter of the outermost circle: 117 mm.
>>
>> Diameter of the innermost circle: 81 mm.
>>
>> Max voltage: 12V
>>
>> Max current: 1A
>>     
>
> It is much easier to make a cylindrical transmitter (with eight copper rings
> glued on a delrin tube pushed over the axle and use standard carbon brushes and
> holders obtained as spare parts for an electric motor with the same diameter
> collector as stator contacts).
>
>   
That's how the slip rings on cable reels work. The brushes are 
replaceable but if I remember right were not carbon
(but might've been carbon graphite, its been about 7 years since I was 
in that industry). The reel did not turn very fast,
about 10RPM max.
> For the 'disc' approach I have used four (or eight) pieces of model car race
> track and the contact 'shoes' from the cars once. This is good for 4 wires and
> 1A and 12V as you need. The tracks are laid in a circle and glued on the moving
> part (which was a spinning exhibit table in my case - so it did not need to be
> very reliable or long lived). The shoes were glued on plastic rulers which were
> each held by a bolt on the other side, so they could pivot. This took care of
> any small eccentricity. A piece of rubber tube glued under the rulers provided
> tension (very little is needed for car brushes).
>
> Of course this is a toy.
>   
Good points, P.

--Bob

> hope this helps,
> Peter
>
>
>   

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