Can the feedback and primary and secondary coils be nested in concentric circles in a vttc?
SpaceWyzard, Thu May 18 2017, 12:25AMJust wondering if this would be a good idea to try out if there is some reason this wouldn't work. I'm thinking of a 2" diameter secondary coil, with a 5 inch primary coil at its base, and instead of placing the feedback coil above or below the primary, actually putting it on a larger 6" form directly outside the primary. Has anyone here tried this before?
Re: Can the feedback and primary and secondary coils be nested in concentric circles in a vttc?
Proud Mary, Thu May 18 2017, 12:59AM
You raise an interesting point, Mr Duroo, because Nikolai Tesla designed a number of resonant RF HV transformers with quite different topologies, though today people usually only think of the vertical secondary with the primary wound around the bottom as being 'a Tesla coil.'
As for your specific question about the feedback winding, the coupling coefficient must be sufficient to deliver sufficient in-phase voltage to the grid to maintain oscillation.
Too little, and oscillation will die out; too much and the valve may 'squegg' - cyclically switch itself on and off at some quite low frequency, or it may enter some chaotic oscillatory mode whose nature we hardly dare guess at.
Proud Mary, Thu May 18 2017, 12:59AM
You raise an interesting point, Mr Duroo, because Nikolai Tesla designed a number of resonant RF HV transformers with quite different topologies, though today people usually only think of the vertical secondary with the primary wound around the bottom as being 'a Tesla coil.'
As for your specific question about the feedback winding, the coupling coefficient must be sufficient to deliver sufficient in-phase voltage to the grid to maintain oscillation.
Too little, and oscillation will die out; too much and the valve may 'squegg' - cyclically switch itself on and off at some quite low frequency, or it may enter some chaotic oscillatory mode whose nature we hardly dare guess at.
Re: Can the feedback and primary and secondary coils be nested in concentric circles in a vttc?
johnf, Thu May 18 2017, 09:50AM
This depends if you want to control with the primary parameters or the secondary parameters.
magnetics tend to invoke the inverse cube law instead of the light and RF inverse square law
johnf, Thu May 18 2017, 09:50AM
This depends if you want to control with the primary parameters or the secondary parameters.
magnetics tend to invoke the inverse cube law instead of the light and RF inverse square law
Re: Can the feedback and primary and secondary coils be nested in concentric circles in a vttc?
Sulaiman, Thu May 18 2017, 02:10PM
Briefly, a part of my career (?) included taking patents owned by my employer,
and thinking up ways to break the patent so that my employer could patent those too,
which makes me suspect that some of the patents (e.g. bi-filar primary)
are more to exclude imitators than beneficial innovations, of little real value.
(how many US patents for an improved or novel mousetrap ?)
Sulaiman, Thu May 18 2017, 02:10PM
Proud Mary wrote ...
You raise an interesting point, Mr Duroo, because Nikolai Tesla designed a number of resonant RF HV transformers with quite different topologies, though today people usually only think of the vertical secondary with the primary wound around the bottom as being 'a Tesla coil.'
You raise an interesting point, Mr Duroo, because Nikolai Tesla designed a number of resonant RF HV transformers with quite different topologies, though today people usually only think of the vertical secondary with the primary wound around the bottom as being 'a Tesla coil.'
Briefly, a part of my career (?) included taking patents owned by my employer,
and thinking up ways to break the patent so that my employer could patent those too,
which makes me suspect that some of the patents (e.g. bi-filar primary)
are more to exclude imitators than beneficial innovations, of little real value.
(how many US patents for an improved or novel mousetrap ?)
Re: Can the feedback and primary and secondary coils be nested in concentric circles in a vttc?
Proud Mary, Thu May 18 2017, 08:41PM
Oh yes, Tesla was very quick to patent, and I'm sure would have put up these anticipatory prophylactic blocks - I can't think what to call them! - as you suggest.
My knowledge of TC variants is really only what I can recall from enjoyable browsing of Victorian scientific illustrations and engineering drawings.
I recall one horizontal push-pull device where the centrally positioned primary was located inside the tube around which the secondary was wound.
When looking at antique apparatus and vintage experiments I always find myself hoping that perhaps the science had moved too fast, that the pressure to move on with new research was so great that potential avenues of discovery were overlooked and have remained undiscovered to this day - which I am sure must happen. Mostly I am envious of the simplicity of the equipment with which revolutionary discoveries were made in the early years of the last century, equipment so simple that even someone with only very modest abilities like myself could construct it with simple tools - the triode valve, Cockcroft & Walton's particle accelerator, X-ray crystallography, Wilson's cloud chamber, the radio telescope, the junction diode - and so on. But of course these illustrious thinkers had to think of these things first! :)
Proud Mary, Thu May 18 2017, 08:41PM
Oh yes, Tesla was very quick to patent, and I'm sure would have put up these anticipatory prophylactic blocks - I can't think what to call them! - as you suggest.
My knowledge of TC variants is really only what I can recall from enjoyable browsing of Victorian scientific illustrations and engineering drawings.
I recall one horizontal push-pull device where the centrally positioned primary was located inside the tube around which the secondary was wound.
When looking at antique apparatus and vintage experiments I always find myself hoping that perhaps the science had moved too fast, that the pressure to move on with new research was so great that potential avenues of discovery were overlooked and have remained undiscovered to this day - which I am sure must happen. Mostly I am envious of the simplicity of the equipment with which revolutionary discoveries were made in the early years of the last century, equipment so simple that even someone with only very modest abilities like myself could construct it with simple tools - the triode valve, Cockcroft & Walton's particle accelerator, X-ray crystallography, Wilson's cloud chamber, the radio telescope, the junction diode - and so on. But of course these illustrious thinkers had to think of these things first! :)
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