Re: Ballast choke questions

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

Original poster: "bob golding by way of Terry Fritz <twftesla-at-uswest-dot-net>" <yubba-at-clara-dot-net>

Hi All,
    On my home made ballast  I found that 1 mm worked out to 5 amps. That
was with 240 volts in feeding my 8200v 250ma tranny with a jacobs ladder
across the secondary for a load. The graph looked very much like the one on
richies site. In use it draws around 8 amps with 2 mm gap.

cheers
bob golding


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, May 10, 2001 12:16 AM
Subject: Re: Ballast choke questions


> Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<bigfoo39-at-telocity-dot-com>
>
> Tesla list wrote:
>
> > Original poster: "Metlicka Marc by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <mystuffs-at-orwell-dot-net>
> >
> > scott,
> > snipped
> >
> > .  3/8" - 1/2" will increase amp draw
> > > capacities by about 30 - 40% compared to
> > > a close fit E I combination.
> > >
> > >
> > wow, 3/8" - 1/2" separation? on my inductors i found the a few
> > thousandths increased (or is it decreased?) my inductance quite a bit to
> > bring the current limiting from 25 amp to 95 amp. i'll have to find the
> > actual measurements that i recorded on paper and then lost (of coarse).
> > maybe i did my calcs wrong?
> > marc m.
>
> Hi Marc...
>
> seems like you were right on the edge of a saturation point ( the knee of
> the BH curve). at the knee,
> a small change of reluctance will make a huge difference in amp flow. That
> is how a saturable core
> reactor works, it takes advantage of the presaturation/saturation point of
> the core to allow a minimal
> control voltage to make a big difference in the amp flow thru the
inductor.
>
>
> Scot D
>
>
>
>
>
>
>