Re: [EVGRAY] Re: Winding BiTT with C shape winding tool

Body

Nice post Ole!
It makes good sense seeing it done in stages like that,

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On Mon, Jan 29, 2018 at 6:32 AM, [email protected] [EVGRAY] <
[email protected]> wrote:

>
>
> Heinz magnetic core circuit reduction to an EI-core with an air gap
>
> And the circuit with references for magnetomotoric forces, reluctances and
> magnetic fluxes:
>
> Regards
> Ole
>
>
>
> ---In [email protected], <onielsen@...> wrote :
>
>
> Hi Kone,
>
> The circles represents the magnetomotive force (mmf) and the rectangles
> represents the reluctance (Rm) or magnetic resistance to the magnetic
> flux [image: \Phi] ('magnetic current'). The mmf is A (Ampere) or A X
> turns which is the total amount of current going around the leg. With these
> three parameters a magnetic circuit works like Ohm's law for an electric
> circuit.
> The lines represents magnetic conductors having no reluctance (ideal
> conductors).
> https://wiki2.org/en/Magnetic_circuit
>
> "MAybe most important or just as important as including the reluctance
> value to the relcutcance boxes, is that there is, I count six "three-way"
> junctions to the Bitt transformer core drawing, while the Jensen has only
> two...at the top and the bottom of the primary..."
> The reluctance for the different legs and parts making up the magnetic
> circuit can be calculated. By using tables of magnetic properties the
> parameters for iron can be found and the cross sectional area of the legs
> and their lengths cam be found. This makes it possible to calculate the
> reluctances.
>
> When two resistors (or reluctances) are in series the resistance can be
> substituted with a single resistor having the value of the two series
> resistors added. For resistors in parallel they can also be substituted
> with a single resistor having the value of the two paralleled resistors
> (the value isn't just added when in parallel). By using these two rules the
> reluctances can be reduced to the simple circuit with few reluctances and
> some ideal magnetic conductors connecting them. Of course a real
> transformer core has its reluctance distributed along the magnetic
> conductors. The schematic model makes it much easier to calculate the
> circuit than using distributed reluctance along the magnetic paths.
>
> Regards
> Ole
>
>
>
>
> ---In [email protected], <konehead@...> wrote :
>
> Hi Ole
>
> I think the drawing of the Thane transformer is not quite correct, as I
> assume the circles represent the three coil windings, and the rectangular
> boxes represent  the transformer legs "reluctance" as you call
> them...:"nagnetic paths" might be another term to use for those boxes and
> it is important that their magnetic-resistance fo magnetic flow
> ("reluctance" to flow) should also be included in each those boxes, as they
> all are not the same resistance to magnetic flow, some paths have skinny
> transformer legs, some have much thicker transformer legs,
>
> For example the large rectangular box in your drawing i in my Bitt core
> made of florist wire, is three times thicker than the rest of thoise inner
> transformer legs.
>
> This is the advice that Gerry gave to me a couple weeks ago, since you
> want to make sure that the magnetic flow has a very strong path to the
> opposite side secondary....So I added three times the number of florist
> wire lengths to my core "perimeter"  and it is three times thicker
>
> Tthere should also be three more rectanfular reluctance boxes in the
> drawing, each underneath the three circles representing the coils, this
> regardless of the thicknesses of the cores, it is just something missing in
> the drawing.
>
>
> MAybe most important or just as important as including the reluctance
> value to the relcutcance boxes, is that there is, I count six "three-way"
> junctions to the Bitt transformer core drawing, while the Jensen has only
> two...at the top and the bottom of the primary...
>
>
> And the three way junctions being excluded are actually the most important
> detail of the BiTT transformer! As those two outside three way junctions on
> the left, and the other two on the right are where the back-currents
> "Decide" which route to take, and that is, back to the primary and reflect
> as extra draw and never overunity, or back across to the opposite side
> secondary, where the power produced in the secondaries becomes
> additive-power (coherent?)
>
>
> ciao
>
> Kone
>
>
>
>
> 
>