Rotating Transformers...
Archiver
Posts: 46,084
This is slightly off topic, but if you'll bear with me, do any of you
know where we can find rotating transformers? I have a BS2 project that
will need to supply power and data to/from rotating parts, much like a
"Propeller Clock" does. Is it possible to reliably transfer data signals
through a 1:1 ratio rotating transformer?
Thanks,
Tim
know where we can find rotating transformers? I have a BS2 project that
will need to supply power and data to/from rotating parts, much like a
"Propeller Clock" does. Is it possible to reliably transfer data signals
through a 1:1 ratio rotating transformer?
Thanks,
Tim
Comments
be too hard... consider a couple of solenoid windings
on a ferrite rod... one winding is bound to the rod
the other loose. Rotation of the rod will not vary
the coupling much - so the two windings are rotationally
independent but magnetically coupled.
Signal and power can be multiplexed time wise and/or
frequency wise. I.e. you can have a constant signal
which uses frequency shift keying to supply power
and data - with periodic off times to listen for reply.
Or use multiple frequencies for sending and receiving
and/or multiple - possibly tuned - windings.
Workable solution in part depends on how fast you need
to transmit data...
Note that you can also put an RF transceiver on the
rotating assembly which receives and transmits data.
[noparse][[/noparse]There is a commercial manufacturer of such equipment
-pretty pricey]. A BASIC STAMP does _not_ get dizzy :-).
However the RF signal will tend to have amplitude
modulation at the rotational frequency....
<><
Date: Mon, 11 Dec 2000 19:27:14 -0800
From: "Tim and Jo" <dema@t...>
Subject: Rotating Transformers...
This is slightly off topic, but if you'll bear with me, do any of you
know where we can find rotating transformers? I have a BS2 project that
will need to supply power and data to/from rotating parts, much like a
"Propeller Clock" does. Is it possible to reliably transfer data signals
through a 1:1 ratio rotating transformer?
><>
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
VCR video head assemblies include one or more rotary transformers,
depending on whether the VCR has flying erase heads or other special
features. If you need to couple power through such a device, you will be
compelled to use high frequency AC, perhaps as high as a few MHz. Data
could be modulated on an RF carrier in the same frequency range.
> This is slightly off topic, but if you'll bear with me, do any of you
>know where we can find rotating transformers? I have a BS2 project that
>will need to supply power and data to/from rotating parts, much like a
>"Propeller Clock" does. Is it possible to reliably transfer data signals
>through a 1:1 ratio rotating transformer?
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!
transformers and slip rings. After some thought, I think that slip rings
would work for my application - they're just a bit pricey - so I'll try to
roll my own. I have a dead VCR that I can look into too.
Tim