Re: Suggested values Spread sheet or PDF (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 25 Oct 2006 19:39:44 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Suggested values Spread sheet or PDF (fwd)

Hi Jim,

I'm not sure if something like that exists, but there are all kinds of 
opinions! Coils are run inside common TC geometry and sometimes outside 
the norm. Also, there are various types of coil configurations. For 
example, relatively high coupling for maggy drivers as opposed to 
classic 2 coil systems with low coupling. Your right, a formal document 
on "normal" parameters would be helpful. Javatc lists a range for the 2 
coil systems in the help file for "coupling coefficient" (.13 to .22), 
but some coils have a lower coefficient and some higher than that range. 
Because it's a function of geometry and placement, the common range 
depends on some common principles of placement.

Primary inductance, hmmm, that is an interesting area as far as how 
much. The greater the inductance, the greater the surge impedance which 
can be a good thing, but how much is too much? I'm not sure. In any 
case, there is a limit as determined by the other components (cap size, 
pps, secondary) for resonance.

Top load reduction is a perfectly valid means of experimentally honing 
in on the change in secondary capacitance, but Javatc doesn't use this 
any longer simply because it no longer needs to "guess" at the toploads 
influence.

The secondary reactance certainly changes with topload. The reason is 
due to the capacitive component. Reactance is determined by the 
inductive and capacitive components. The topload alters the capacitive 
component and thus changes the secondary's reactance.

The archives are certainly the place to find everyones opinions and 
ranges. Many have listed such ranges on the TCML through the years.

In Javatc, if you have no surrounding objects, keep those inputs set to 
0. However, always insert a ground plane radius (that, you can't get 
away from).

I think maybe you should start writing up that document;o)) (it is 
needed). But, don't write purely on what others have said in the 
archives or on the list, find out through your own experiments. 
Unfortunately, only a few have built coils in a wide range of geometry 
and type. Most are experienced only on a small range of coils. Also keep 
in mind that if two coilers were given identical basic specs of building 
a coil, each would have different results due to variations in their 
implementation and choice of components.

Take care,
Bart

Tesla list wrote:

>Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
>---------- Forwarded message ----------
>Date: Tue, 24 Oct 2006 00:17:12 -0700
>From: Jim Mora <jmora@xxxxxxxxxxx>
>To: 'Tesla list' <tesla@xxxxxxxxxx>
>Subject: Suggested values Spread sheet or PDF
>
>Hello all,
>
> 
>
>I think it would be neat and entirely useful if someone ( may exist and I
>don't know it) could state the optimum figures for coil modeling given a set
>of variables. What I mean is say the K of the sec coil - larger is better or
>range? Self inductance and capacitance surely forms the resonance of an
>unloaded coil? Most of us still in the hard knocks school know that K
>between .13 -.18 is good and mutual inductance as well as primary
>inductance- higher is better. Is there any help in Java 10 that addresses
>the more obscure item details so we have something a little more tangible to
>shoot it. Even a list would help. Other issues "top load reduction
>percentage" "sec coil reactance" does this change when a terminal is
>attached. Medhurst K, Medhurst self Cap! ( obvious to some to the point that
>you may not realize that the figures are just calculations. and not well
>understood, by some of us. Worth some discussion. Maybe I need to browse the
>archive stacks.
>
> 
>
>Otherwise JavaTC Rocks! I'll force myself into 10, but I have no surrounding
>objects Do I leave those fields blank?
>
> 
>
>Jim Mora
>
> 
>
>If we want a high Q coil, all these items come into play, yes? Is there a
>calc for Q? Still learning how much I don't know.by learning more of course.
>Thanks for your patience! I am starting to get a vision of what happens when
>you press down on some part of the pillow, and what will rise.
>
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