Re: [TCML] H/D Question

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Shelton,

Given the specs, it's difficult for me to say anything other than what 
is obvious. The turns are low and therefore the inductance is low (sec). 
The h/d is low, etc.. If you have dimensions of the top load, primary 
(including inner and outer dia., height above ground, style, relation to 
secondary, etc..),  basically the physical dimensions of both coils as 
well as top load including at least vertical descriptions of L1 to L2, 
then maybe some detail can be looked at. The numbers presented are a 
mesh and not coincidentally relevant to the final case. For example, who 
cares what the self resonant capacitance is to a coil when it's a value 
that doesn't consider all the other objects around the coil? As soon as 
other objects surround the coil (physical environment, top load, 
primary, strike ring, or whatever), the self resonant frequency no 
longer has meaning and doesn't even physically exist.

The problem I have is that there are many irrelevant values intertwined. 
The final system values are what is real. If you can, explain your 
dimensions (the more detailed, the better) and then we can run a better 
analysis (we don't need outputs, only really good inputs). We all have 
our different methods to analysis (programs like Javatc, Excel, etc.). 
It's the inputs which matter.

Given what you've shown, I see an NST problem using a resonant cap size, 
a spark issue using low h/'d, and a top potential problem with low 
inductance. But I would really like to see input values more detailed 
for a better analysis.

Take care,
Bart

H.S. J. wrote:
> On a smaller lower powered coil (4", 15kv, 30ma) is it necessary to keep that 1:4/1:5 H/D ratio?  I designed one thats had a H/D of 1:2.75.  Would I be running into any issues?
>
> Plans are as follows:
>
> Secondary Coil DesignDiameter of secondary coil : 101.60mm (4")
> Winding height of secondary coil : 279.40mm (11")
> Wire diameter for secondary coil : 0.6452mm (22AWG)
> Spacing between windings : 0.00mm
> Secondary turns : 433.00
> Secondary wire length : 138.22m
> Secondary inductance : 5.86mH
> Approximate resonant frequency : 830.59kHz
> Secondary quarter wavelength resonant frequency : 542.61kHz
> Secondary self capacitance : 6.27pF
> Toroid capacitance required to form quarter wavelength coil : 8.42pFPrimary Coil DesignPrimary capacitance : 0.0053uF
> Primary resonant frequency : 542.61kHz
> Secondary coil diameter : 101.60mm (4")
> Primary conductor diameter : 3.26mm (8AWG)
> Primary turn to turn spacing : 12.70mm (.5")
> Spacing between the secondary and the inside turn of the primary : 50.80mm (2")
> The primary will need to be tapped between turn 6 and turn 7 to form a resonant circuit at 542.61kHz
> The approximate inductance at each turn is : 
> Turn 1 0.49uH
> Turn 2 1.77uH
> Turn 3 3.75uH
> Turn 4 6.45uH
> Turn 5 9.88uH
> Turn 6 14.10uH
> Turn 7 19.17uH
> Turn 8 25.13uH
> Turn 9 32.06uH
> Turn 10 40.00uH
> Turn 11 49.02uH
> Turn 12 59.18uH
> Turn 13 70.55uH
> Turn 14 83.19uH
> Turn 15 97.15uHNeon Transformer / Primary Capacitor MatchingTransformer secondary voltage : 15.00kV
> Transformer secondary current : 30.00mA
> Number of transformers : 1
> Primary capacitor required to form a resonant circuit at 60Hz with neon transformer(s) : 0.0053uF
>  
> --
> Thanks,
> ***********************************************
> Shelton Jacinto
> Email: hsheltonj@xxxxxxxxx
> ***********************************************
>
>
>
>       
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