Thane Heins Perepiteia.

[CRANKYpants]

Okay, you really got my brain spinning there. Or you saying that your primary winding has a 1/8" non magnetic substance between the primary winding and the primary core?

Thanks, Larry

NO I AM SAYING THE PRIMARY TOROID IS "C SHAPED" (BUT THE OPENING IS 1/8 OF AN INCH AND ALSO ADJUSTABLE)  AND THE TWO TOROIDS ARE PLACED TOGETHER LIKE THIS "OO" AND THE PRIMARY WINDINGS ARE WOUND OVER THE GAP.

THE FINISHED PRODUCT LOOKS LIKE THIS:
___
OO

THE THEORY IS THAT THE PRIMARY MAGNETIC FIELD WILL "HELP" CARRY FLUX ACROSS THE AIR GAP - BUT IT IS A ONE WAY STREET BECAUSE THE SECONDARY BACK EMF INDUCED FLUX UNDER LOAD HAS TWO FLUX PATH CHOICES AND HOPEFULLY IT CHOOSES THE LOWER RELUCTANCE SECONDARY ROUTE?

ALSO THERE ARE TWO FERROMAGNETIC BRIDGES CONNECTING THE TWO SECONDARIES SO THAT THE SECONDARY INDUCED FLUX CAN BYPASS THE PRIMARY. IF YOU ARE USING SQUARE CORES YOU MAY WANT TO  AUGMENT YOUR BRIDGE A LITTLE.

NOW THE NICE THING ABOUT USING TOROIDS IS THAT WHEN YOU CUT OUT THE AIR GAP YOU CAN PEEL AWAY THE INNER CORE LAMINATIONS AND CREATE THE BRIDGE WHICH HELPS REDUCE SECONDARY TO SECONDARY EDDY CURRENT LOSSES.

YESTERDAY I REWOUND MY PRIMARY - BUT THE GAP WAS 1/16 " AND THIS PROVED TO BE TOO SMALL (BECAUSE PRIMARY CURRENT AND Pf CHANGED UNDER LOAD) - IT SHOULD NOT CHANGE AT ALL.

I SENT JM SOME PHOTOS WHICH WILL BE POSTED WHEN SHE HAS TIME.

CHEERS
Thane

[JustMe]

DEAR ALL,



PLEASE FIND ENCLOSED THE PHOTO DATA FROM YESTERDAY THE DAY BEFORE THAT.



WHEN I WOUND THIS PRIMARY I MADE THE MISTAKE OF TAKING OUT MY 1/16 INCH SHIM FROM INSIDE THE COIL. AS YOU CAN SEE FROM THESE PHOTOS THE PRIMARY IS NOT ISOLATED AND THE SCOPE POWER FACTOR OF ABOUT 0.7 AND

DOES NOT AGREE WITH THE METER Pf OF 0.11.



PREVIOUS TESTS WITH THE SHIM IN PLACE SHOWED THE PRIMARY CURRENT DROPPING BY 0.02 - 0.03 AMPS WHEN LOADED.



SO BACK TO THE DRAWING BOARD!

I WILL BE TAKING STEVEN'S SUGGESTION AND REWINDING THE PRIMARY TODAY WITH DOUBLE STRANDS AND I WILL REPLACE THE PLASTIC SHIM.



CHEERS

Thane

[JustMe]

DEAR ALL,



I STARTED CONSTRUCTION ON A NEW BI-TOROID TODAY AND HERE IS A PHOTO OF HOW I AM GOING ABOUT IT.



THIS TIME I WILL HAVE A REMOVABLE AND VARIABLE PRIMARY AIR GAP SHIM.

I WILL ALSO BE MAKING THE PRIMARY CORE SMALLER YET ABOUT 1/2 THE SIZE AS SHOWN.



THERE IS A LAMINATED "BRIDGE" WHICH GOES BETWEEN THE TWO TOROIDS TO HELP "ENCOURAGE" COIL INDUCED FLUX TO FLOW INTO THE OPPOSING COIL RATHER THAN DOWN THE HIGH RELUCTANCE PRIMARY LEG.



I WILL ALSO BE CONTINUING THE SECONDARY WINDINGS ONTO THE BRIDGE AND PUTTING THEM AS CLOSE TOGETHER AS POSSIBLE.



CHEERS

Thane

[waterhouse24]

Some fantastic work to date Thane.

Can I just make sure I understand this... and ask you kindly to fill in the gaps (no pun intended )

thanks

Lee

[CRANKYpants]

Some fantastic work to date Thane.
Can I just make sure I understand this... and ask you kindly to fill in the gaps (no pun intended )
thanks
Lee

JUSTME WILL BE POSTING SOME OF TODAYS CONSTRUCTION PHOTOS IN DUE COURSE WHICH OUGHT TO ANSWER YOUR QUESTIONS IN LESS THAN 1000 WORDS.

THANKS
Thane