Inductive something or other

["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>

Hi All....

been doing the mad scientist thing today and tried out an idea with an EI
core that has been neglected for
way to long.

the idea is to create an adjustable inductor ( electrically) for pig
ballasting.

what I did was wind 2 coils in the same direction and placed them on the 2
outer portions of the E core.
The middle core was wound with an other coil but wound in the opposite
direction of the 2 outer coils.

Theory is that as a current is applied ( series wise) from the voltage
source to this triple coil EI core
and then to the load ( pig) the flux produced by the current will travel
inwards towards the middle core
leg. If one were to apply a voltage to the coil on the middle leg, that
voltage will produce a flux flow
opposite to the other flux flows from the outer coils. If enuf voltage is
applied to the middle coil, it
should counter the flux from the outer coils , thus reducing the   ( fill
in the blank here )    voltage
??  or current???

I tested this theory today and applied 30V to the outer coils, with no
voltage applied to the center coil.
the voltage thru the outer coils remained at 30 V. As I increased the
voltage to the inner coil ( via a
variac) the voltage reading began to drop on the outer coils.

I took measurements of voltage , amperage on the variac and voltage
readings on the outer coils.
It seems that for each volt dropped on the outer coils required an increase
of equal voltage from the
variac.
( considering that all 3 coils have the same number of turns
approximately). The amperage reading
increased about .125 amps for each 1 volt increase from the variac.   For a
27volt increase on the variac
there was a 3 amp increase. When 30 V was applied from the variac to the
center coil, the output voltage
on the outer coils went to 0 V.

Since i didnt wind the coils tightly and secure them to the core legs very
well, there was a bit of
humming at the 30 V variac level.

I also drove the voltage up a bit higher on the variac to 35V and the outer
coil measurements went back up
to 5 V from 0 V.  ( im thinking that the voltage in the center coil
"reinduced" a "reversal" voltage in
the outer cores ...  basically reversed the transformer).



what do yall think????    am i just making an complicated voltage
controller or is it reducing the current
flow in the process ???    Does this thingy have potential to be a
ballasting item for piggies?  Orrrr
is it just a complicated, expensive add on to a variac ( which would do the
same thing)??

Gonna go think about this some more .......

Scot D