Re: Ballast choke questions

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

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