Thursday, 21. June 2007
Topic: TESLA - on June 21, 2007 at 8:28:00 AM CEST
Dr. MegaVolt
Tesla coils are interesting devices. Many people think that they are nothing more then transformers with high turns ratios, but they aren't really much like conventional transformers. A conventional transformer is an inductive device; capacitive effects are usually minimal. Conventional transformers have very tight coupling between the primary and secondary windings; this is accomplished by using magnetic cores which have high permeability. Tesla coils have air cores. this is for several interesting reasons: standard magnetic materials typically have electrical conductivity, requiring massive insulation to prevent flashovers in a high-voltage transformer. The second reason is that many magnetic materials are very lossy at high frequencies, which is where Tesla coils operate.
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