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*To*: tesla@xxxxxxxxxx*Subject*: Re: Wire length LC derivation,*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Mon, 14 Mar 2005 20:02:15 -0700*Delivered-to*: testla@pupman.com*Delivered-to*: tesla@pupman.com*Old-return-path*: <teslalist@twfpowerelectronics.com>*Resent-date*: Mon, 14 Mar 2005 20:07:49 -0700 (MST)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <qVjgjD.A.jNE.EGlNCB@poodle>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

"There are several simplifying assumptions you have made that are not valid. This has been well addressed in the literature at least 70 years ago, if not earlier."

From the time of Maxwell on; I believe Lorentz did the first exact formulation during the 1880's. Very accurate approximate (and much easier to use) formulae were available by 1900.

"1) the secondary is not an infinite solenoid in a typical tesla coil. More exact equations are available for various configurations (e.g. NBS Circular 74), or one can numerically integrate the configuration."

Terry has C74 in .pdf form at hotstreamer. Interesting reading but tedius to pick through. There are many excellent formulae in it, including calculation of inductance, mutual inductance, and capacitance of many configurations.

"2) The self capacitance is not that of an isolated sphere. If you must approximate, you should probably use that for a cylinder over a ground plane. Medhurst is the standard reference for these equations. Or, as with inductance, you can numerically integrate."

There are plenty of inductance and capacitance calculation programs on the web, some running "on screen" in Java. Try a google search. There is also a lot of good stuff on Antonio's site.

Ed

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