From: tesla-bounces@******.com on behalf of Brian
Sent: Tuesday, August 04, 2009 9:45 AM
Subject: [TCML] Tesla Coil Modeling
Has anyone on the list ever done a 3D EM model for any of the Tesla coil
designs? I have done 2D but never tried a 3D. I would be interested to know
if anyone has done it and how accurate the results seemed. I am toying
around with the notion of doing a 3D model and just compare the results. The
2D model I did was using the Ansoft Maxwell program and seemed to work ok.
Tesla mailing list
I'm interested in a multi-physics model of the Tesla system, checked using actual dual Tesla coils. Greg Leyh has tried
for Greg's circuit diagram.
The goal is to repeat the demonstrations showing that the electrical field energy developed by a well-designed Tesla coil transmitter can be detected by a sensitive, well-tuned Tesla coil receiver placed at a distance exceeding a few wavelengths. The present investigations involve scaled-down versions of Tesla’s wireless system such might be assembled by the typical Tesla coil experimenter.
The operational power levels are insufficient to excite earth resonance or result in massive atmospheric ionization in the vicinity around and above the transmitter.
No provisions are made for the generation of vertical ionizing beams originating at the elevated terminals and projecting up to an elevation of say 8 km where conductivity can more easily be imparted to the air.
Measurement of the radio-wave emissions of the refined Tesla coil transmitter is made following guidelines set forth in "FCC Methods of Measurements of Radio Noise Emissions From Industrial, Scientific, and Medical Equipment."
The instrumentation for measuring the radio-wave field strength is a spectrum analyzer with a preamplifier for sensitivity improvement connected to a balanced tuned magnetic ferrite loop antenna. A conventional radio transmitter with a tuned air loop antenna is used to test the efficacy of the radio wave emissions testing apparatus and for calibration purposes.
It is to be determine whether the electrical field energy is being carried from the transmitter to the receiver by ordinary radio waves or if some other unidentified, mechanism is involved.
This might be satisfactorily demonstrated by showing that a sensitive radio receiver, one capable of detecting signals emanating from a radio transmitter operating at the same frequency as the Tesla coil transmitter, is not able to receive a signal from the Tesla coil transmitter itself, and if a radio signal is present that is of insufficient strength to account for the energy that is actually received by the Tesla coil receiver.
The basic assumptions behind this comparative study of a radio wave transmission-reception system and a 'Tesla wave' transmission-reception system are as follows:
1) The emissions associated with operating grounded Tesla coil transmitters are predominantly non-radiating with reduced emissions in the form of radio waves.
2) Radio receivers connected to conventional non-grounded or non-counterpoise radio antennas are more sensitive, to a degree yet to be determined, to radio waves than they are to the non-radiating electromagnetic field energy associated with operating Tesla coil transmitters. Non-grounded radio antennas can be constructed, the performance of which approach that of the perfect radio antenna.
3) Grounded Tesla coil receivers are more sensitive, to a degree yet to be determined, to the non-radiating energy associated with operating Tesla coil transmitters than they are to vertically polarized radio space waves. Grounded Tesla coil transmitters and grounded Tesla coil receivers can be constructed, the performance of which approach perfection in both cases.
4) Radio transmitters with tuned grounded or ground plane counterpoise antennas are also capable of emitting the form of electromagnetic field energy associated with operating Tesla coil transmitters and that radio receivers with this class of antenna are also capable of collecting the predominant form of electromagnetic field energy associated with operating Tesla coil transmitters.
It follows that if the energy from a Tesla coil transmitter is well collected by the Tesla coil receiver, but not by the radio receiver connected to an ungrounded magnetic loop antenna, while at the same time the radio receiver does collect energy from a radio-wave transmitter connected to ungrounded magnetic loop radio antenna, all of them operating at the same frequency, then the energy from the Tesla coil transmitter that is collected by the Tesla coil receiver is not predominantly in the form of radio waves.
If this is found to be true, the cause-and-effect relationships will shed light on question of whether the energy is being transferred by means of ordinary radio waves or if some other mechanism is involved.
There is also a requirement for an accurate detailed multi-physics model of the Tesla wireless system.
Empirical data collected using the above-outlined investigative protocol can be
applied in attempts to validate
August 14, 2009