Thanks for the info on this, I do intend to build a rotary gap at some
point, once I have a decent workshop again :)
On Tue, Jul 10, 2018, 7:51 AM phil <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
>
> 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
>
> ------------------------------------------------------------------
>
> 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:
>
> https://www.pupman.com/listarchives/2018/Jul/msg00019.php entitled "Bad
> strike to a 12 inch traditional coil (somewhat
> terminal)"<https://www.pupman.com/listarchives/2018/Jul/msg00019.php>
>
> To sum up:
> 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):
>
> http://www.hvtesla.com/richie.html
>
>
> Phil
>
>
> On 09/07/18 15:27, Matthew Sweeney wrote:
> > 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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> >>
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> > Tesla mailing list
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>
> --
> Regards Phil www.hvtesla.com
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