Attached is the Tesla patent for coils that are claimed to neutralize self inductance. I'm sure this subject has been beaten to death on all FE forums but a critical look at the patent and it's claims would be a good thing, in an attempt to find the "magic" properties if they exist of such a coil that are often assigned to it. I don't claim to know a lot about these type coils, a I have only very briefly experimented with them a long time ago. Maybe we can discover something by going back and taking a closer look. Starting with the main two claims at the end of the patent, we will later try to dissect the text of the patent. Neutralizing self inductance. What does that mean? verb (used with object), neutralized, neutralizing. 1. to make neutral; cause to undergo neutralization. 2. to make (something) ineffective; counteract; nullify: As I understand it, neutralizing self-inductance would leave just normal inductance i.e. the inductance of each of the turns added together without the squaring factor of self inductance. Since neutralizing self inductance is the gist of the claims, this should be easy to test. We need to take two equal lengths of wire, wind one length as a spiral single wire in the usual manner according to Fig 1. Wind the other in the spiral layer bifilar wound manner as described in Fig 2 of the patent. Compare the two coils for inductance. One, the non-bifilar should follow the number of turns squared law (n^2) for self inductance of a spiral coil. http://www.deepfriedneon.com/tesla_f_calcspiral.htmlThe pancake bifilar version of the same length of wire should follow the linear law, just the straight number of turns relating to inductance. So it should have a lot less inductance than the Fig 1 version with self inductance. You can use the same formula, just leave off the squaring term. Has anyone attempted this? Seems like it would be a good first step in determining the properties of the coil. One could also compare the prior two winding versions with a straight solenoid winding. I suppose the next test would be to ring the coils with white noise and examine the spectral response in order to determine self resonance modes. I lack the equipment to do this so if anyone is interested, please do.
« Last Edit: 2017-04-30, 16:58:46 by ION »
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