Re: [EVGRAY] Coils cw or ccw. Instead use dot convention.

Body

Ole,

I can clearly picture Norm's claim of the vectors not cancelling without
the mirror symmetry, if one takes into account both the transverse and
longitudinal. 

Think of Wheeler Feynman time symmetry.




On 9/30/2018 6:48 AM, [email protected] [EVGRAY] wrote:
>  
>
> Hi Norman,
>
> This is transmission line theory which has to be applied when the
> wavelength approaches the dimensions of the circuit. A Tesla
> transformer is to be treated as a transmission line transformer where
> the waves are guided by the wire and are around or even shorter than
> the length of the wire. For LF transformers like mains frequency
> transformers this doesn't matter. For a hi-fi audio frequency
> transformer perhaps it may have some influence. At least it is an art
> to design such a transformer because of all the parasitic parts it is
> made up of.
>
> Your 8 Ohm coils only have this impedance at one particular frequency
> as the impedance increases with the frequency. The parasitic DC
> resistance is the minimum impedance they will get.
>
> Regards
> Ole
>
>
> ---In [email protected], <nwootan@...> wrote :
>
> Ole!  Nice try but no cigar here.  Please rethink your scenario.  At
> first appearance to the neophyte, that does not understand mirror
> symmetry and total phase cancellation, your solution seams like a
> winner. NOT!  After studying Tesla's huge pancake coil and how it
> worked I built my two counter wound coils each with an impedance of 8
> ohms.  You absolutely have to have the mirror symmetry in order to
> totally phase cancel the vectors of the AC driving signal.  Think
> about the traveling AC sine wave over the two coils in mirror
> proximity. Supposedly electrons travel 11.75 inches / nano second.
> Lets realize that each foot of wire traveled there is a phase shift in
> the AC sine wave that absolutely has to be perfectly mirrored to
> effectively phase cancel the shifting phase angles of the two
> vectors.  I have been there and done this and it works.  Example was
> the two coils I built and by shear luck got perfect symmetry and
> cancellation resulting in no vectors and what I perceived as a
> longitudinal output with no magnetic field nor electrical field! 
> Think about this!!
>
>
> On 9/30/2018 6:01 AM, onielsen@... <mailto:onielsen@...> [EVGRAY] wrote:
>
>>      
>>
>>     I'm wondering why people here discusses winding directions of coils.
>>
>>     The easiest way to wind coils is to wind all of them in the same
>>     direction. Then when the field or phase is to go in the opposite
>>     direction just switch around the pair of wires going to that
>>     particular coil. That's the way it is normally done which also
>>     prevents unwinding one coil while winding the next coil on the
>>     same bobbin. Use the dot convention to mark the ends of the wires
>>     and then just switch the sets of wires that are to be of opposite
>>     phase. Place the dots in all start ends or alternatively in all
>>     finish ends of coils wound in the same direction.
>>
>>
>>     The Dot Notation and Dot ConventionTransformer Phasing: he Dot
>>     Notation and Dot Convention
>>     The Dot Notation and Dot Convention
>>
>>
>>     Source of the figures:
>>     https://www.electricaltechnology.org/2013/12/transformer-phasing-the-dot-notation-and-dot-convention.html
>>
>>     Regards
>>     Ole
>>
>
>