OK Bert, I don't know what " autotransformer effect" is!😉
Doug
On Sat, Oct 17, 2020 at 3:07 PM Bert Hickman <bert@xxxxxxxxxxxxxxxxxxxxx>
wrote:
> Clever approach, Mike!
>
> You'd need to watch out for autotransformer effect bumping up voltage on
> the innermost turn. You might need to widen the gap between innermost
> turn and secondary but otherwise this should work.
>
> Bert
>
> mike tucknott via Tesla wrote:
> > Hi All
> >
> > With a bipola coil would having 2 movable tap point work for changing
> > the coupling ?
> >
> > Say the coil need 5 turns to be in tune, you could built the primary
> > with 10 turns and you could move the inner and outer taps points in or
> > out but still keeping the 5 turns needed to keep the coil in tune, the
> > inner and outer turns passed the tap point would be electrialy dead so
> > to speak.
> >
> > Thoughts on this one guys.
> >
> > Cheers Mike T
> >
> >
> > On 17/10/2020 00:43, Gary Lau wrote:
> >> Hi Kurt,
> >>
> >> Splitting and separating the secondary seems like a great way to vary
> the
> >> coupling, but one must also bear in mind that doing that will vary the
> >> Lsec
> >> inductance and tuning. I can't think of a way to vary only the
> >> coupling on
> >> a bipolar coil, but I have never built one.
> >>
> >> Regards, Gary Lau
> >> MA, USA
> >>
> >> On Fri, Oct 16, 2020 at 7:15 AM Kurt Schraner <k.schraner@xxxxxxxxxxx>
> >> wrote:
> >>
> >>> ...just my 2 cents: cutting the bipolar secondary in 2 independently
> >>> movable
> >>> halfs could enable the control of the coupling (see the ASCII-sketch):
> >>>
> >>> oooooooooooo
> >>> __________________ __________________
> >>> I__________________I I__________________I <---->
> >>>
> >>> oooooooooooo
> >>>
> >>> ...the primary can be either of a solenoid or a flat spiral.
> >>>
> >>> Regards, Kurt Schraner
> >>>
> >>> -----Ursprüngliche Nachricht-----
> >>> Von: Tesla <tesla-bounces@xxxxxxxxxx> Im Auftrag von jimlux
> >>> Gesendet: Freitag, 16. Oktober 2020 02:15
> >>> An: tesla@xxxxxxxxxx
> >>> Betreff: Re: [TCML] Coupling
> >>>
> >>> On 10/15/20 6:50 AM, Douglas Johnson wrote:
> >>>> Thank you both, I think I know where to go from here on my current
> >>>> build.
> >>>> My project is a larger bipolar than I have built to date. Secondary is
> >>> 3.5"
> >>>> dia. X 24" with .015 mag wire. By the time I built the primary it
> >>>> was 6"
> >>>> long and I was getting "runners" on the secondary. I think my fix will
> >>>> be going to a flat spiral primary.
> >>> On a bipolar, it's hard to control the coupling on a solenoidal primary
> >>> sliding it one way or the other doesn't change the flux distribution
> >>> very
> >>> much.
> >>>
> >>> I'm not sure a flat is any better.
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>
> --
> Bert Hickman
> Stoneridge Engineering LLC
> Woodridge, Illinois, USA
> http://www.capturedlightning.com
> +1 630-964-2699
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