Tesla states that the series bifilar pancake coil generates 250,000 times the electrical potential as the single wire coil of equal turns. He goes on to state that it's the elevated charge storage that cancels the self inductance at any input current or frequency; Hence, as evostars points out, the bifilar "Never Generates Any Flyback"!

The biflar coil generates a stronger magnetic field than the single wire coil when it's pulsed, as I've been pointing out for over eight years.

Pulsing the iron nail core through the single wire coil, first produces a "Positive" current, then when the current's interrupted, a "Negative Current" pulse follows. This cancels the "Impulse Magnetization" effect.

The series bifilar doesn't generate a negative "Cancellation Pulse".

Quote from: webby1 on April 24, 2017, 10:57:54 AM
You only loose it if you let it get lost.

What if the transfer is not a dump?
What if you are not "storing" the energy?

What dose a capacitor do?-stores energy.
If you do not want to store energy,then why do you need a high capacitance value in the coil?


Brad

FWIW, attached is a sim of a TBP coil modeled as a cross coupled symmetrical transmission line which hopefully will answer some questions about the uniqueness of this device.  This sim was based on parameters supplied by TK and are as follows- individual winding inductances are 172uH and 176uH, the series connected inductance is 680uH, capacitance between windings is 2.8nf, and the DCR is 3.9 ohms.  When the sim and TK's TBP bench results were compared, they were within ~1.5%.

TBP_1A shows the plot sweep from ~50kHz to 1.25MHz and as can be seen there are 2 dips and 1 peak in Vout across the 1 ohm sense resistor.  There is also a trace showing the sum of the all the currents in the odd inductors L1-L23 over time representing one winding of the TBP and the other line is identical but not shown for clarity.  Also, the 10v peak input voltage Vin from the generator is divided by 100 for plot clarity.

TBP_2A shows an expanded view of the first dip in output voltage/current in Vout across/thru R1.  The frequency is ~277kHz, Vout is ~561uv rms, while the total current in the odd L's is ~140ma rms.  This shows the apparent output current to ground of the TBP to be nearly zero while there is still induction in both windings which would be detectable with a separate sense coil in proximity.

TBP_3A shows an expanded view of the 1st peak in output current at 505kHz plus the levels of output voltage and the odd L's winding current.

Regards,

PM

Edit: Added 'cross coupled'.

Partzman

It is unfortunate that TK is one of the Builders who has left this forum

issues with member Synchro and most recently This Fellow Zephir's
TOS violations.

Quote from: webby1 on April 24, 2017, 11:59:23 AM
Could you put that in newbie terms?

I think you are saying that almost no current flow and yet there is still an induction transfer?

There is current flow within the TBP that is recirculating and creating induction in the windings, but little current exits the circuit at the frequency shown in the example.  This circulating current is the result of energy transfer between the winding inductances and the distributed capacitance between windings.  The small current in the sense resistor on the output represents the losses in the TBP such as the DC resistance of the windings and other parasitics.   

The internal induction of the TBP can be sensed with an external coil and if the coil is loaded, the current in the output sense resistor to ground will increase as energy is drawn from the transmission line or TBP.

PM