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Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
TC -
Please use JAVATC (from ) to design your coil. This is a far more sophisticated design tool than you are using, and it will be much easier for you see the affects of varying topload size, winding length, wire gage, and the required length of primary conductor. After "optimizing" your design, post the results here for review.
Okay! thank you! Ill be sure to give that a shot! Are there any good guides for JAVATC out there? I have never used the program and it asks for some numbers that I haven't really decided on yet, so I just want to make sure everything is right.
Is there some sort of guide to using javatc? Becausebi find it slightly confusing. I'm not sure which values I need and which I can do with out and still be able to get any results!
hey guys, would someone maybe be able to look over my results and suggest some tweaks i could make to improve my design? id like to get my primary wire length down to under 50 i at all possible! thanks!
J A V A T C version 12.5 - CONSOLIDATED OUTPUT Mon 05 Sep 2011 10:40:04 PM CDT
-----------------------------------------
----------- Secondary Outputs: -----------------------------------------
----------- 181.27 kHz = Secondary Resonant Frequency 90 deg° = Angle of Secondary 20 inch = Length of Winding 72.5 inch = Turns Per Unit 0.00115 inch = Space Between Turns (edge to edge) 1518.4 ft = Length of Wire 5:1 = H/D Aspect Ratio 97.7386 Ohms = DC Resistance 42489 Ohms = Reactance at Resonance 0.73 lbs = Weight of Wire 37.306 mH = Les-Effective Series Inductance 39.862 mH = Lee-Equivalent Energy Inductance 39.136 mH = Ldc-Low Frequency Inductance 20.664 pF = Ces-Effective Shunt Capacitance 19.339 pF = Cee-Equivalent Energy Capacitance 32.098 pF = Cdc-Low Frequency Capacitance 6.78 mils = Skin Depth 15.992 pF = Topload Effective Capacitance 175.5888 Ohms = Effective AC Resistance 242 = Q
-----------------------------------------------
----- Primary Outputs: -----------------------------------------
----------- 170.86 kHz = Primary Resonant Frequency 5.74 % high = Percent Detuned 0 deg° = Angle of Primary 80.54 ft = Length of Wire 13.36 mOhms = DC Resistance 0.553 inch = Average spacing between turns (edge to edge) 0.869 inch = Proximity between coils 1.42 inch = Recommended minimum proximity between coils 108.461 µH = Ldc-Low Frequency Inductance 0.00711 µF = Cap size needed with Primary L (reference) 0 µH = Lead Length Inductance 211.378 µH = Lm-Mutual Inductance 0.103 k = Coupling Coefficient 0.129 k = Recommended Coupling Coefficient 9.71 = Number of half cycles for energy transfer at K 28.22 µs = Time for total energy transfer (ideal quench time)
-------------------------------------------
--------- Transformer Inputs: ------------------------------------------
---------- 120 [volts] = Transformer Rated Input Voltage 15000 [volts] = Transformer Rated Output Voltage 30 [mA] = Transformer Rated Output Current 60 [Hz] = Mains Frequency 120 [volts] = Transformer Applied Voltage 0 [amps] = Transformer Ballast Current 0 [ohms] = Measured Primary Resistance 0 [ohms] = Measured Secondary Resistance
--------------------------------------
-------------- Transformer Outputs: -----------------------------------------
----------- 450 [volt*amps] = Rated Transformer VA 500000 [ohms] = Transformer Impedence 15000 [rms volts] = Effective Output Voltage 3.75 [rms amps] = Effective Transformer Primary Current 0.03 [rms amps] = Effective Transformer Secondary Current 450 [volt*amps] = Effective Input VA 0.0053 [uF] = Resonant Cap Size 0.008 [uF] = Static gap LTR Cap Size 0.0138 [uF] = SRSG LTR Cap Size 83 [uF] = Power Factor Cap Size 21213 [peak volts] = Voltage Across Cap 53033 [peak volts] = Recommended Cap Voltage Rating 1.8 [joules] = Primary Cap Energy 182.2 [peak amps] = Primary Instantaneous Current 30.7 [inch] = Spark Length (JF equation using Resonance Research Corp. factors) 9.3 [peak amps] = Sec Base Current
-----------------------------------------
----------- Rotary Spark Gap Inputs: ------------------------------------------
---------- 0 = Number of Stationary Gaps 0 = Number of Rotating Electrodes 0 [rpm] = Disc RPM 0 = Rotating Electrode Diameter 0 = Stationary Electrode Diameter 0 = Rotating Path Diameter
----------------------------------------
------------ Rotary Spark Gap Outputs: -----------------------------------------
----------- 0 = Presentations Per Revolution 0 [BPS] = Breaks Per Second 0 [mph] = Rotational Speed 0 [ms] = RSG Firing Rate 0 [ms] = Time for Capacitor to Fully Charge 0 = Time Constant at Gap Conduction 0 [µs] = Electrode Mechanical Dwell Time 0 [%] = Percent Cp Charged When Gap Fires 0 [peak volts] = Effective Cap Voltage 0 [joules] = Effective Cap Energy 0 [peak volts] = Terminal Voltage 0 [power] = Energy Across Gap 0 [inch] = RSG Spark Length (using energy equation)
---------------------------------------
------------- Static Spark Gap Inputs: ------------------------------------------
---------- 2 = Number of Electrodes 0.25 [inch] = Electrode Diameter 0.524 [inch] = Total Gap Spacing
-----------------------------------------
----------- Static Spark Gap Outputs: -----------------------------------------
----------- 0.524 [inch] = Gap Spacing Between Each Electrode 21213 [peak volts] = Charging Voltage 21203 [peak volts] = Arc Voltage 31862 [volts] = Voltage Gradient at Electrode 40465 [volts/inch] = Arc Voltage per unit 100 [%] = Percent Cp Charged When Gap Fires 10.723 [ms] = Time To Arc Voltage 93 [BPS] = Breaks Per Second 1.8 [joules] = Effective Cap Energy 431254 [peak volts] = Terminal Voltage 168 [power] = Energy Across Gap 32.1 [inch] = Static Gap Spark Length (using energy equation)
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
TC -
Plug #24 AWG wire for your secondary into JAVATC and see what happens.
This should give you a "theoretical" tune point of around 12.5 turns on your primary (~37' of conductor). Remember that you'll want at least 2 turns MORE than the theoretical tune point to allow you to adjust for the "actual" tune point.
Also, it looks like you didn't input the "lead length" required to connect your primary coil to the spark gap and the MMC. This lead length is just an extension of your primary coil conductor, and needs to be factored into the total primary conductor length. This will further reduce the length of the 1/4" tubing that's required for your primary coil.
-----------------------------------------
----------- Secondary Outputs: -----------------------------------------
----------- 237.09 kHz = Secondary Resonant Frequency 90 deg° = Angle of Secondary 21 inch = Length of Winding 47.6 inch = Turns Per Unit 0.0009 inch = Space Between Turns (edge to edge) 1047.2 ft = Length of Wire 5.25:1 = H/D Aspect Ratio 26.6606 Ohms = DC Resistance 26016 Ohms = Reactance at Resonance 1.28 lbs = Weight of Wire 17.464 mH = Les-Effective Series Inductance 18.185 mH = Lee-Equivalent Energy Inductance 17.714 mH = Ldc-Low Frequency Inductance 25.803 pF = Ces-Effective Shunt Capacitance 24.78 pF = Cee-Equivalent Energy Capacitance 37.181 pF = Cdc-Low Frequency Capacitance 5.8 mils = Skin Depth 21.958 pF = Topload Effective Capacitance 97.1377 Ohms = Effective AC Resistance 268 = Q
-----------------------------------------------
----- Primary Outputs: -----------------------------------------
----------- 237.08 kHz = Primary Resonant Frequency 0 % = Percent Detuned 0 deg° = Angle of Primary 48.81 ft = Length of Wire 8.1 mOhms = DC Resistance 0.422 inch = Average spacing between turns (edge to edge) 0.865 inch = Proximity between coils 0 inch = Recommended minimum proximity between coils 56.537 µH = Ldc-Low Frequency Inductance 82.47051 µF = Cap size needed with Primary L (reference) 0.005 µH = Lead Length Inductance 114.856 µH = Lm-Mutual Inductance 0.115 k = Coupling Coefficient 0.129 k = Recommended Coupling Coefficient 8.7 = Number of half cycles for energy transfer at K 18.19 µs = Time for total energy transfer (ideal quench time)
-------------------------------------------
--------- Transformer Inputs: ------------------------------------------
---------- 120 [volts] = Transformer Rated Input Voltage 15000 [volts] = Transformer Rated Output Voltage 30 [mA] = Transformer Rated Output Current 60 [Hz] = Mains Frequency 120 [volts] = Transformer Applied Voltage 0 [amps] = Transformer Ballast Current 0 [ohms] = Measured Primary Resistance 0 [ohms] = Measured Secondary Resistance
--------------------------------------
-------------- Transformer Outputs: -----------------------------------------
----------- 450 [volt*amps] = Rated Transformer VA 500000 [ohms] = Transformer Impedence 15000 [rms volts] = Effective Output Voltage 3.75 [rms amps] = Effective Transformer Primary Current 0.03 [rms amps] = Effective Transformer Secondary Current 450 [volt*amps] = Effective Input VA 0.0053 [uF] = Resonant Cap Size 0.008 [uF] = Static gap LTR Cap Size 0.0138 [uF] = SRSG LTR Cap Size 83 [uF] = Power Factor Cap Size 21213 [peak volts] = Voltage Across Cap 53033 [peak volts] = Recommended Cap Voltage Rating 1.8 [joules] = Primary Cap Energy 252.8 [peak amps] = Primary Instantaneous Current 30.7 [inch] = Spark Length (JF equation using Resonance Research Corp. factors) 14.3 [peak amps] = Sec Base Current
-----------------------------------------
----------- Rotary Spark Gap Inputs: ------------------------------------------
---------- 0 = Number of Stationary Gaps 0 = Number of Rotating Electrodes 0 [rpm] = Disc RPM 0 = Rotating Electrode Diameter 0 = Stationary Electrode Diameter 0 = Rotating Path Diameter
----------------------------------------
------------ Rotary Spark Gap Outputs: -----------------------------------------
----------- 0 = Presentations Per Revolution 0 [BPS] = Breaks Per Second 0 [mph] = Rotational Speed 0 [ms] = RSG Firing Rate 0 [ms] = Time for Capacitor to Fully Charge 0 = Time Constant at Gap Conduction 0 [µs] = Electrode Mechanical Dwell Time 0 [%] = Percent Cp Charged When Gap Fires 0 [peak volts] = Effective Cap Voltage 0 [joules] = Effective Cap Energy 0 [peak volts] = Terminal Voltage 0 [power] = Energy Across Gap 0 [inch] = RSG Spark Length (using energy equation)
---------------------------------------
------------- Static Spark Gap Inputs: ------------------------------------------
---------- 2 = Number of Electrodes 0.25 [inch] = Electrode Diameter 0.524 [inch] = Total Gap Spacing
-----------------------------------------
----------- Static Spark Gap Outputs: -----------------------------------------
----------- 0.524 [inch] = Gap Spacing Between Each Electrode 21213 [peak volts] = Charging Voltage 21203 [peak volts] = Arc Voltage 31862 [volts] = Voltage Gradient at Electrode 40465 [volts/inch] = Arc Voltage per unit 100 [%] = Percent Cp Charged When Gap Fires 10.723 [ms] = Time To Arc Voltage 93 [BPS] = Breaks Per Second 1.8 [joules] = Effective Cap Energy 380978 [peak volts] = Terminal Voltage 168 [power] = Energy Across Gap 32.1 [inch] = Static Gap Spark Length (using energy equation)
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
TC -
This is why you really need to layout the ENTIRE coil, visualize & sketch each part, and determine approximate size and relative locations of each component. The "lead length" includes all the wiring connecting the primary coil to the spark gap, the spark gap to the tank capacitor, and the tank cap back to the other end of the primary coil. This can easily total 2 feet, although the objective is to keep this wiring as short and direct as possible.
You also need to revise your spark gap design. For decent quenching with a static gap, you'll want multiple (5-7) small gap segments connected in series. The parallel-copper-pipe-gap works well (search "TCBOR" or "RQ" gap). For a 15/30 NST, use 3-5" long segments of 1/2" or 3/4" diameter copper pipe, supported so the pipes are perfectly parallel and with a .030 or .040" gap between each pair of electrodes.
Remember that the TC design calculators give you the theoretical number of primary turns required to achieve resonance, and that the actual tune point may be greater or less than the theoretical tune point. That means that you need to provide 1-2 more primary turns more than the calculator specifies to ensure that you can find a tap-point that will achieve resonance.
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My first tesla coil (SGTC)
