Re: Charging inductors for resonant charging

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

Original poster: Finn Hammer <f-h-at-c.dk> 

Ed Phillips (who commands my unlimited respect) wrote:
 >Real designers step forward?<

Obviously not being that, I am creeping along the floor panels, to offer 
this lead:
http://femm.foster-miller-dot-net/download.htm
Finite Elements Method Magnetics
It is a distribution called FEMM, a magnetics field solver. As one of the 
design training exersises, the design of an inductor on a gapped core is 
covered in detail.

For the likes of Jim, it should be a piece of cake to use.

I have done some work in DC excited magnetostatics with it, and the results 
were corresponding with those that I got with the 3000USD Magneto program,
http://www.integratedsoft-dot-com/brochures/magneto.pdf

Hope it helps, Finn Hammer

(to whom it would be a "Wind it on a couple of MOT cores to get a seat of 
the pants feeling of the subject" kind of thing)
Tesla list wrote:

>Original poster: Ed Phillips <evp-at-pacbell-dot-net>
>Tesla list wrote:
>  >
>  > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
>  >
>  > What sort of sources are there for a 5-15 Henry charging inductor for a
>  > resonant charging circuit? RMS current would be in the 1-2 Amp range.
>  >
>  > Is this a "wind it on a MOT core" kind of thing?
>     I'm no a magnetics designer but that sounds like a HUGE device to me!
>If the charging frequency was 120 Hz the reactance of the 5 henry choke
>would be about 3770 ohms and the voltage across it at 1 amp would then
>be 3770 volts.  If it is to pass 1 amp the wire size would probably have
>to be around #22 even for intermittent operation, and the resulting wire
>area would require a large core.  Real designers step forward?
>Ed
>