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Do you why that would be the case? Ive never built a rotary gap coil and
would like to know more :)
Thanks!
Matt
On Sun, Jul 8, 2018, 4:22 PM <pip@xxxxxxxxxxx> wrote
Do you why that would be the case? Ive never built a rotary gap coil and
would like to know more :)
Thanks!
Matt
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Matt.
My observations were based on just that - observations. We, that is
myself and another UK coiler, have ran both SRSG and ARSG coils, as well
as statics and each tends to display different streamer characteristics,
although it's mainly the rotary coils where this is noticeable.
A very good explanation on RSG and static gaps and the pros and cons is
at Richie Burnett's excellent web site, as my own brain cells have lost
their edge lately on the more technical aspects.
Richie's site is at www.richieburnett.co.uk/ and there is info on my
own site http://www.hvtesla.com. Also try the archives on here.
Basically once you've decided on either a static or rotary (RSG) gap,
then if you choose rotary you then have two flavours: SRSG or ARSG. The
latter Asynchronous rotary is quick and easy to build, while a
Synchronous rotary is more efficient at lower bps rates, but also a lot
more work to achieve, needing motor modification and careful control of
the phase using some form of phase control, and also care is needed with
the MMC size**. Probably only worth it if you want to squeeze every last
bit of performance out of a coil.
An SRSG at 100/120 bps (50 or 60Hz) can be particularly challenging as
you can then run into some very high resonant voltages if you get the
phase wrong. This is now thought to behind the damage at my other recent
posting:
Static: - Easy to build, generally suited up to 6 or 7kW (yes I know
others have ran twice that)
Rotary ARSG:- Easy to build, handles power better than a static with
theoretically no upper level for hobby coiling.
Rotary SRSG:- Lot more work involved, most efficient up to 300bps
(particularly at 200/240 bps) if pursuing 100% power, harder to run,
handles power as ARSG above.
People often try SRSG but don't get success because MMC size and phase
are critical. (See "resonant charging" on Richie's site)
I've left out 'triggered gaps' another thing that used to interest me,
but never got around to trying.
Good luck experimenting.
** Note: MMC resonance is affected by both mains frequency AND the bps
rate if using synchronous. Richie calls it resonant charging and has an
old TCML post reproduced here with the graphs he refers to (now dead links):
Do you why that would be the case? Ive never built a rotary gap coil and
would like to know more :)
Thanks!
Matt
On Sun, Jul 8, 2018, 4:22 PM <pip@xxxxxxxxxxx> wrote:
If you have wondered on how each perform, especially in their streamer
behaviour, have a look here:
https://youtu.be/Sm8SoFmnlLM
There is a general feeling that 200bps will give marginally longer
strikes, while 100bps is better for ground strikes.
Phil T
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