Re: Saturable Reactor Waveforms

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>

Well, so much for my immediate efforts to make a
MOT-based SR; my order of eight MOTs arrived today
severely damaged due to an abominable packing job.
I'll refrain from indicating who the seller is until
I've found out whether they're willing to offer any
kind of remediation.

Pretty much ruins my week.  And it's only Tuesday!
Sheesh...

Regards,
Aaron, N7OE

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "J. Aaron Holmes"
> <jaholmes@xxxxxxxxxxxxxxxxxx>
>
> Yes.  I was planning on doing this, but for
> different
> reasons (somebody suggested last week on hvlist and
> a
> choke in series with the control might be needed in
> order to eliminate harmonics).
>
> Regarding the additive/subtractive flux, however, I
> would hope to see things cancel out.  With the
> control
> sides of the transformers in a pair being in phase
> with each other, it seems like the control-induced
> flux aids each transformer in opposite half cycles.
> What this means in practice I'm not sure of, but
> will
> endeavor to find out when my transformers finally
> arrive.  It may have more of an impact in cases
> where
> the MOT primaries in a pair are in series rather
> than
> parallel, too, because if it influences the
> impedances
> of the primaries in opposite half cycles, this would
> seem likely to translate into much higher AC on the
> control side by basically turning the pair into a
> variable voltage divider.  ...but still, all
> speculation.
>
> Anyway, you're right, there is some very worthwhile
> investigation to be done.  Carl already has a bunch
> of
> stuff hooked up, and may be able to beat me to it.
> Otherwise, I will definitely be looking into this.
>
> Regards,
> Aaron, N7OE
>
>
> --- Tesla list <tesla@xxxxxxxxxx> wrote:
>
>  > Original poster: "S&JY"
> <youngsters@xxxxxxxxxxxxxxx>
>  >
>  > To SR constructors,
>  >
>  > I have been reading with much interest your
> success
>  > using pairs and paired
>  > groups of transformers to make SRs.  If one of
> you
>  > has made scope photos of
>  > the resulting output waveform into a resistive
> load,
>  > please post them where
>  > we can view them.  A series of photos at
> increasing
>  > DC control voltages
>  > would be interesting.  I am especially interested
> in
>  > the effects on output
>  > waveform symmetry vs DC control voltage.  Seems
> like
>  > in half a cycle, the
>  > magnetic fields would be additive, causing core
>  > saturation sooner than with
>  > the other half cycle where the magnetic fields
> would
>  > be opposing and would
>  > somewhat cancel out.  Thus the output waveform
> would
>  > not be symmetrical.
>  > Or, because of the use of pairs of transformers,
> do
>  > the asymmetries from
>  > each individual transformer balance out when they
>  > are connected in series?
>  >
>  > Thanks,
>  > --Steve Y.
>  >
>  >
>  >
>
>
>