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Practical aspects of development of Tesla's coil apparatus

Practical aspects of development of Tesla's coil apparatus. Marko Cveji ć , mcveja @gmail.com Milan Miloševi ć , milan milosevic@gmail.com Prof. dr. Branko Kolun dž ija, kol @etf.bg.ac.yu Prof. dr. Jovan Cveti ć , cvetic_j@etf.bg.ac.yu. Motivation.

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Practical aspects of development of Tesla's coil apparatus

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  1. Practical aspects of development of Tesla's coil apparatus Marko Cvejić, mcveja@gmail.com Milan Milošević, milan milosevic@gmail.com Prof. dr.Branko Kolundžija, kol@etf.bg.ac.yu Prof. dr.Jovan Cvetić, cvetic_j@etf.bg.ac.yu

  2. Motivation • Project of making Tesla Coil at the Faculty of Electrical Engineering of Belgrade and scientific determination of its characteristic (resonant frequency) • Attempt to use WIPL-D to determine Tesla coil resonant frequency • Comparing obtained results with experimental results Tesla - Neverending Story

  3. Basic facts of WIPL-D software • WIPL-D is a powerful program for fast and accurate analysis of metallic and/or dielectric/magnetic structures (antennas, scatters, passive microwave circuits, etc.). The calculations are done in the frequency domain. • As an output, WIPL-D provides the current distribution on the structure, radiation pattern, near-field distribution, admittance, impedance, and s-parameters at the predefined feed points. WIPL-D also provides 2-D and 3-D graphs of parameters of interest (admittance and impedance). Tesla - Neverending Story

  4. Appearances • Appearance of the splash screen • Appearance of the file of simulation Tesla - Neverending Story

  5. Secondary circuit modeling in WIPL-D • Secondary circuit consists of two parts: - coil - top capacitance • Main task is to create an appropriate geometrical model of the structure and to define distributed loadings for that model Tesla - Neverending Story

  6. Secondary circuit modeling in WIPL-D: modeling the coil • The secondary coil is geometrical modeled as a cylindrical surface with distributed loadings. • Every curved surface is composed of n plane surfaces. Model accuracy depends on number of plane surfaces that make curved surface. Tesla - Neverending Story

  7. Secondary circuit modeling in WIPL-D: modeling the top capacitance • Top capacitance is made of toroid and two circles that close inside of toroid • Toroid is modeled by BoR Tesla - Neverending Story

  8. Secondary circuit modeling in WIPL-D: modeling the top capacitance • Circles that close inside of toroid from the top and the bottom are approximated by 16 equal segments Tesla - Neverending Story

  9. Secondary circuit modeling in WIPL-D: other • Nodes, wires, junctions, generators • Nodes and wires can be defined by user or they are predefined because they belong to other complex objects • Each entity has its own number Tesla - Neverending Story

  10. Distributed loadings • Next very important task is to input correct distributed loadings • Skin effect is included by putting σ parameter (conductivity for copper) • RLC parameters for secondary coil and top capacitance Tesla - Neverending Story

  11. Starting simulation • For the determination of the self-resonant frequency of the secondary circuit, the generator is connected to cylinder. • The last thing to do is to determine the frequency range of interest and the number of frequencies per range Tesla - Neverending Story

  12. Results (1) • Depending of complexity of structure results defer: Tesla - Neverending Story

  13. Results (2) Tesla - Neverending Story

  14. Results (3) Tesla - Neverending Story

  15. Results (4) 107 kHz Tesla - Neverending Story

  16. Results – comparing to experiment 107.8 kHz Results obtained from simulation match the results from experiment measured signal acquisitioned via GPIB Tesla - Neverending Story

  17. Results – radiation patern Tesla - Neverending Story

  18. Conclusion • In this novel approach WIPL-D (developed at the Faculty of Electrical Engineering of Belgrade) is used. • Although the software is designed to deal with the linear media and low voltages, it is applied here assuming that the effects of corona discharges at the top of the secondary are negligible compared to other parameters of the secondary coil. • The results show more resonant frequencies with different values compared to the lumped element approach. • The existence of the main resonant frequency of secondary coil at 107 KHz is confirmed. Tesla - Neverending Story

  19. References • K.L.Corum, J.F.Corum: “Class Notes: Tesla Coils and the failure of Lumped-Element Circuit”, paper available at http://www.ttr.com/corum/ . Accessed 1999. • P. Nicholson “Tesla Secondary Simulation Project”, the study available at http://www.abelian.demon.co.uk/tssp , last revision 18th June 2002. • WIPL-D Software, Help Manual. Tesla - Neverending Story

  20. Acknowledgments • Prof. Branko Kolundžija • Prof. Milan Savić • Prof. Radivoje Đurić • Prof. Acc. Aleksandar Maričić • Vladimir Malić, Aleksandar Vacić, Marko Ćosic, Ivana Milovanović, Uroš Mitrović and Nebojša Malešević Tesla - Neverending Story

  21. Thank you for your attention! Tesla - Neverending Story

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