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*To*: tesla-at-pupman-dot-com*Subject*: Re: Vortex gap loss measurements*From*: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Mon, 04 Sep 2000 12:35:09 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla list wrote: > Original poster: "Malcolm Watts" <M.J.Watts-at-massey.ac.nz> > The linear decrement of a ringing RLC circuit which has a gap > in series with it was discovered by Stone circa 1914. The > Corums mention it in their literature but unfortunately never > went on to use the information in their modelling. The linear > decrement is entirely due to the gap characteristics. An RLC > circuit by itself produces only a logarithmic decrement. This > clearly shows that modelling the gap as a resistancwe does not > work. You cannot apply the classic time constant equations to > this situation. The gap is dissipative but that is where the > similarities with resistance end. I analysed this and wrote a > note on it several years ago. It is important to note > (ultimate pedantry) that you *cannot* ascribe a value for Q to > the primary if the primary includes a gap. You can compare > various primaries with each other by comparing the ringdown > slope (gentler is obviously better). Note that unless the primary losses are very high, you can approximate exp(-a*t) as 1-a*t with great precision for the time used for complete energy transfer to the secondary (the intial value and the first derivative fot t=0 are identical). The transfer takes just a few cycles, and modeling the gap as a linear resistor during this time, if the main difference is that the decay is linear and not exponential, doesn't make significant difference. ("a" would be Rgap/(2*Lprimary) if you consider only the primary circuit. Considering the secondary, there are two time constants in the system, a compliated function of the element values and losses in the entire circuit.) Antonio Carlos M. de Queiroz

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