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Registered Member #58126
Joined: Sun Dec 13 2015, 01:56PM
Location:
Posts: 1
Hello - I've been working on an 810 tube coil and been having some unexplained problems with it. I remember reading about someone talking about relative winding directions for the three coils and how it seems to make a big unexpected difference in performance. That and their orientation in the schematic. This might be the source of the problems I'm having with this coil. I believe Rodger form Ohio had talked about this. Does anyone have any info that might help?
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
Changing the winding director changes the phasing of the coil with respect to the top/bottom of the coil. If you swapped a CW wound coil out for a CCW wound coil you would just need to swap the connections. So if the top of you primary / feedback coil was connected to some node of the circuit you would now connect the bottom.
To a first order approximation, flipping the coil should not make a difference, the magnetic coupling is the same.
There could be some effects on the E-field depending on the coil winding direction. In one direction the Efield of the primary / feedback coil is out of phase with the secondary coil, in the other direction it is in phase.
I don't think this would have much of an impact though as the secondary voltage is so much higher than the primary / feedback voltage and the capacitance coupling the two is small. If you wanted to better quantify this you could simulate it as a coupling capacitance.
My guess would be that if it had any impact at all you would want the coils wound such that the Efield of all of the coils is in phase.
If you have the "wrong" phasing of the feedback coil a VTTC will not oscillate or oscillate very weakly leading to no / weak sparks. It could be possible that what you read had the personal also accidentally swapping the phasing in addition to the winding direction, leading to a large change in performance due purely to the incorrect phasing.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
You obviously need to have the phasing/polarity of the coils correct, so starts/finishes chosen to give the correct sense of feedback.
However, whether the coils are wound CW or CCW is bordering on pseudoscience. There is no effect, to first order.
There is a very very slight effect to second order, but essentially irrelevant, it amounts to slight differences of strays. It will not make the difference between a working and non-working coil, but it might affect the precise frequency by a few ppm.
There are unfortunately many people who wear tin-foil hats who will seize on any parameter to obsess over, and winding direction is one of them, usually for transmitting their free energy.
There is one situation where winding direction is important, and that's the slow wave structure for a circular polarised helical antenna. The handedness of the helix means it will couple to CW or CCW polarisation. Of course, you can see that the wavelength is of the order of the helix dimensions. In a Tesla coil, the winding helix dimensions are orders of magnitude smaller than the wavelength, and so are essentially irrelevant.
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VTTC Winding Direction
