Re: Wire Length (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Moderated and approved by: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 23 Dec 2006 16:54:10 -0800
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Wire Length (fwd)

Hi Gerry,

Tesla list wrote:

>Moderated and approved by: Gerry Reynolds <greynolds@xxxxxxxxxx>
>
>---------- Forwarded message ----------
>Date: Fri, 22 Dec 2006 23:07:59 -0700
>From: Gerry  Reynolds <gerryreynolds@xxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Wire Length (fwd)
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>Hi Bart,
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>In this thread I'm presuming the following terms are in reference to the TC 
>primary, yes???
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No, the secondary.

>Is "rim grounded" the outer or inner rim???
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Rim grounded is the outer rim of the secondary at ground.
Center grounded is the inner winding end at ground.
Note in Paul's recent graphs the "rg" and "cg".

>Does center grounded mean driven hot at inner turn and tapped turn and 
>somewhere in the center is a voltage null???
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The hot end is opposite the grounded end. I'm think that is all Paul was 
referring. It would be typical to have a terminal capacity on one end of 
the secondary and ground the other end. With helical shapes, obviously 
the top end is hot. But with a flat coil, either end can be grounded. If 
we wire center grounded, then the hot end is the outer rim. I would 
rather ground the outer rim keeping the center of the coil the hot end 
and easy terminal connection.

>How does JAVATC configure the primary???  outer turn, inner turn, or center 
>grounded??
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In both the secondary and primary input sections, radius1 is the 
"grounded" end (which is a typical configuration). There are rules of 
geometry written in the Javatc to keep coilers from calculating a coil 
that can't physically be built or calculated for that matter which 
prevents a "bailout" during the crunch (just a front end check of 
geometry). However, for the secondary portion I'm not overly concerned 
there for some geometry such as a flat coil (Autotune doesn't touch the 
secondary). I've already checked Javatc removing the secondary geometric 
rules for the flat coil case. No problem, it ran fine and all output 
data and dimensions were good (did a comparison today).

As far as geometry, Javatc determines if a coil is flat, helical, cone, 
or inverse cone. Each configuration has it's own set of rules so it's 
easy to allow/disallow at will. I'll update that but I'll wait to see if 
Geotc gets an update or not.

Take care,
Bart

>Gerry R.
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>>---------- Forwarded message ----------
>>Date: Thu, 21 Dec 2006 20:14:26 -0800
>>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: Re: Wire Length (fwd)
>>
>>Hi Paul,
>>
>>Excellent! Thanks for running the numbers. I should be able to perform
>>the measurements you discussed once the coil is ready. The comparison
>>between inner and outer grounded configurations noting the current
>>maximums are interesting, especially the rim grounded case where the
>>current rise to max is in the first few turns.
>>
>>For the primary, I planned on using about 30 feet of copper ribbon,
>>about 2 turns. I was planning on the ribbon starting about 1" proximity
>>and to be wound in the same direction and on the same horizontal plane
>>of the secondary with 0.375" spacing between the 2 turns. So, just
>>imagine the ribbon as an extension of the secondary with the joint of
>>the two coils to be grounded. The ribbon itself is small but should be
>>sufficient. The ribbon dimensions are .007 x .375.
>>
>>BTW, in Javatc I don't allow for the rim grounded situation (geometry
>>error). There are reasons for this but may not be needed with this
>>particular coil configuration (I'll have to check that out). I was able
>>to perform the model with Fantc however with no problems, however,
>>numbers are quite a bit off from your sim software. Ex; Lee came out to
>>7.5mH, 495kHz. This was using the highest resolution Fantc allows.
>>
>>Take care,
>>Bart
>>
>>    
>>
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