Re: just wondering

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

Original poster: "john cooper" <tesla-at-tesla-coil-dot-com> 

Richard Hull has some tapes on his magnifier research and has reported 
coupling coefficients of over 0.50 and I believe he either hit or slightly 
exceeded 0.60, I'll have to review those tapes, but those numbers are 
probably contemporary records for a magnifier and really do point out the 
power processing abilities of a well built magnifier.  Tesla migrated to 
his magnifier design due to this greater efficiency.  Gotta go check out 
your link now.
John


---------- Original Message ----------------------------------
From: "Tesla list" <tesla-at-pupman-dot-com>
Date:  Sun, 25 Apr 2004 12:31:04 -0600

 >Original poster: "Antonio Carlos M. de Queiroz" <acmdq-at-uol-dot-com.br>
 >
 >Tesla list wrote:
 >
 > > Original poster: "john cooper" <tesla-at-tesla-coil-dot-com>
 > >
 > > In a magnifier, you want the tightest coupling possible, i.e., a 
solenoidal
 > > primary.  That doesn't mean that other primary configurations won't work
 > > but the magnifier's main reason for being is its power processing
 >capability.
 >
 >Not necessarily the "tightest possible", but any reasonable design ends
 >with a quite high coupling.
 >See: http://www.coe.ufrj.br/~acmq/tesla/magnifier.html
 >
 >Just to verify, I can use the Inca program to calculate the coupling
 >coefficient between a flat primary coil and a flat secondary coil that
 >continues it, forming a disk. Let's suppose a primary with 10 turns
 >with maximum radius of 50 cm and minimum radius of 25 cm, with a
 >secondary coil with 1000 turns with the shape of a disk inside it,
 >with a radius of 24 cm. Wires with 2 mm and 0.2 mm.
 >Inductances: 0.l mH and 167 mH
 >Coupling coefficient: 0.294
 >Not very tight, but enough for a magnifier operating close to mode
 >4:5:6.
 >
 >Antonio Carlos M. de Queiroz
 >
 >
 >