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*To*: tesla-at-pupman-dot-com*Subject*: Re: Modeling E-Fields of Tesla Coil - Building a model*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Fri, 04 Jun 2004 18:29:35 -0600*Resent-Date*: Fri, 4 Jun 2004 18:33:21 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <M6Gxf.A.riE.ATRwAB-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Antonio Carlos M. de Queiroz" <acmdq-at-uol-dot-com.br> Tesla list wrote: > > Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> > > I have ANSOFT's Maxwell 2D and 3D program which can do both magnetostatic > and electrostatic modeling. > Just had a few questions for how to properly model a tesla coil. > > SECONDARY COIL > ***************** > Can I make the assumption that voltage is evenly distributed down the > secondary coil from the potential seen on the top load > to the ground plane (0V)? If so, I would probably split the secondary into > a number of smaller disks and assign a potential for > each disk. The actual voltage profile can be more complex, but a linear variation is a good approximation. > FOR SINGLE TOROID > ******************* > For a single toroid, i assume the entire toroid should be set at a single > voltage. Surely. > FOR DOUBLE STACK TOROIDS > **************************** > How do you treat the potential across say two stacked toroids. Do you > assume each toroid has equal potential ? ? ? Yes. > BREAK-OUT POINTS > ******************* > Should be easy enough by merely putting a small dib on the toroid. Yes, but this breaks the symmetry, and a 3D simulation is required. > Any other thoughts or comments?? This simulation can predict the initial breakout voltage, and calculate some capacitances. To predict the behavior of the system before breakout, with more precision than a simple lumped model, you would have to simulate inductances too, maybe by splitting the coil as a series of coupled inductors across a network of capacitances, that a simulator can calculate. The complete system could then be reduced to a complicated lumped circuit and simulated in a conventional circuit simulator. A more complete model would have to include resistances, including skin effect and irradiation, and even so the simulation would only predict what happens before breakout. And I didn't mention a primary spark gap, if this is an "old type" coil. Antonio Carlos M. de Queiroz

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