Re: Charging inductors for resonant charging

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

Original poster: "S & J Young" <youngs-at-konnections-dot-net> 

Jim,
I have used the secondaries of MOTs successfully.  MOTs range from 6 to 20+
Henry, so you may have to measure a few of them to get the value you want.
If you want to control saturation, it only takes a few minutes to hacksaw
through the core welds and put a small air gap in the magnetic path (e.g. a
few layers of masking tape).  I didn't bother to remove the magnetic shunts.

I don't know what your end use is, but if it is a TC, consider using a RSG
configured as a SPDT switch.  This is used to charge the tank cap, then
discharge it through the primary.  Your power supply is totally disconnected
from the tank circuit as it discharges.  In this configuration, the charging
reactor only needs to be around 0.2 Henry and can easily be made with a few
air coil solenoids in series to withstand the voltage.
--Steve Y.
.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 29, 2004 5:52 PM
Subject: Re: Charging inductors for resonant charging


 > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 >
 > At 08:01 AM 1/29/2004 -0700, you 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?
 >
 >
 > So then, what ARE people using for charging chokes in resonant charging
 > systems..
 >
 >
 >
 >
 >