Re: primary angle

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:
> Original poster: "Qndre Qndre" <qndre_encrypt@xxxxxxxxxxx>
> Hey Daniel,
> yes it does greatly affect the coupling. If you are using 0 degrees 
> (flat spiral) you will have a very low coupling coefficient, which 
> is the prefered configuration for coils. If you are using 90 degrees 
> (cylindrial spiral) you will have a very high coupling coefficient 
> which might result in racing arcs.
> Why doesn't every coil have a flat spiral if lose coupling is the 
> configuration to be preferred?

Possibly because someone copied a design of a coil not intended to
produce sparks, but to transfer energy with high efficiency.
This requires high coupling, and the angled primary is a compromise
between high coupling and high insulation. There is also the question
of the voltage profile along the secondary coil, that is affected
by the shape of the primary coil. An angled primary probably produces
a more uniformly rising voltage along the secondary. An ideal primary
shape would have the same mutual inductance between the primary and
all the turns of the secondary coil.

Antonio Carlos M. de Queiroz


--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.362 / Virus Database: 267.13.4/175 - Release Date: 18/11/2005