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Re: [TCML] Coupling

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
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