Re: Where am I going askew ?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Christopher,

I would prefer the 4.5" diameter at a winding length of 22.5" (5:1 h/d). 
So, if you use 24 awg you'll be right at 1000 turns.

So, the primary should allow at least an 1" of clearance from the 
secondary. I would probably build it with between 1" - 1.5" clearance.
Assuming 1" clearance, the inside diameter would be 7.5".

To tune the coil at your cap value indicated with toroid in-situ, the turns 
would be around 16.4 with an outer diameter measuring to 22.874 (flat 
primary). This is based on a quick run on Javatc v.10 and a modeled loaded 
resonant frequency of 221.4 kHz. The toroid was assumed to have no center 
disc. The secondary is also assumed to be 20" off the floor. The primary 
was modeled for a 0.153 coupling coefficient, which puts the primary 1.565" 
above the bottom turn of the secondary.

Note, these parameters allow for a nice balance between secondary 
inductance and primary turns.

I'll pop in Javatc's consolidated output below for this particular setup.

Take care,
Bart

Tesla list wrote:

>* primary coil should have at least   "enough"   turns to tune the coil 
>and at a 7.5" inside diameter.
>
>* secondary coil should use the ____" pvc, and have
>   ____ turns of AWG____ magnet wire.







J A V A T C v.10 - CONSOLIDATED OUTPUT
Tuesday, October 14, 2003 6:25:30 PM

Units = inches

Surroundings:
100 = Ground Plane Radius
100 = Wall Radius
100 = Wall Height
100 = Ceiling Radius
100 = Ceiling Height
-------------------------------------
Secondary Coil:
Current Profile = G.PROFILE_LOADED
2.25 = Radius 1
2.25 = Radius 2
20 = Height 1
42.5 = Height 2
1000 = Turns
24 = Wire Awg
-------------------------------------
Primary Coil:
3.25 = Radius 1
11.437 = Radius 2
21.565 = Height 1
21.565 = Height 2
16.38 = Turns
0.25 = Wire Diameter
0.00536 = Primary Cap (uF)
0.153 = Desired Coupling (k)
-------------------------------------
Top Load Objects (dimensions & connection):
Toroid #1: minor=4, major=20, height=46.5, topload
-------------------------------------
Secondary Outputs:
221.37 [kHz] = Secondary Resonant Frequency
90 [deg°] = Angle of Secondary
44.4 = Turns Per inch
0.0024 [inch] = Space Between Turns (edge to edge)
20 [awg] = Recommended Wire Size
1178.1 [ft] = Length of Wire
5 = H/D Aspect Ratio
30.25 [ohms] = DC Resistance
27116 [ohms] = Reactance at Resonance
1.44 [lbs] = Weight of Wire
19.495 [mH] = Les-Effective Series Inductance
18.692 [mH] = Lee-Equivalent Energy Inductance
20.858 [mH] = Ldc-Low Frequency Inductance
26.514 [pF] = Ces-Effective Shunt Capacitance
24.824 [pF] = Cee-Equivalent Energy Capacitance
40.305 [pF] = Cdc-Low Frequency Capacitance
5.523 [mils] = Skin Depth
20.711 [pF] = Topload Effective Capacitance
-------------------------------------
Primary Outputs:
221.37 [kHz] = Primary Resonant Frequency
0 [%] = Percent Detuned
0 [deg°] = Angle of Primary
62.983 [ft] = Length of Wire
0.25 [inch] = Average spacing between turns (edge to edge)
1 [inch] = Primary to Secondary Clearance
96.434 [uH] = Ldc-Low Frequency Inductance
218.271 [uH] = Lm-Mutual Inductance
0.153 [k] = Coupling Coefficient
6.54 = Number of half cycles for energy transfer at K
14.55 [uS] = Time for total energy transfer (ideal quench time)