Re: Designing High-Gain Triple Resonance Tesla-Transformers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq-at-uol-dot-com.br> 

Tesla list wrote:
 >
 > Original poster: "Day, Michael" <Michael.Day-at-USPTO.GOV>
 >
 > It would appear that obtaining coupling coefficient of
 > 0.6742, and 0.7156 may present a formable problem.  These
 > coupling coefficients appear unusually high as compared to
 > the coupling coefficients that I have seen quoted by the
 > average coiler hobbyist.  Does anyone on this list have
 > any experience(s) in obtaining comparable couplings that
 > they would be interested in sharing?

Systems with these high couplings are not usually built as our
open air systems. They must be encased in pressurized gas,
oil, or solid dielectric for proper insulation.
It's possible, however, to make a magnifier driver with quite
high coupling by using a flat primary coil and a short
solenoidal coil. To increase the effective coupling, the bottom
of the secondary coil can be connected to the top of the primary
coil (ground the outer end of the primary coil, and connect the
inner end to the bottom of the secondary coil, both wound in the
same direction). Make the primary coil conical, and coupling
coefficients around 0.7 can be easily obtained.

 > To date, the only resonant transformers that I have seen having
 > such high coupling coefficients have been of the spiral strip
 > design that include inner and outer ring cages to shape the
 > electric field in the margins of the transformer.  (See, for
 > example, IEEE Transactions on Nuclear Science, Vol. NS-26, No.
 > 23, June 1979, pp4211-4213.)  What is not clear to me in the
 > spiral strip design is how the ring cages are connected.  That
 > is, are the ring cages connected to their respective inner and
 > outer winding?

Couldn't find the article. Too old to be on the IEEE site.

Antonio Carlos M. de Queiroz