Quote from: synchro1 on May 07, 2017, 09:12:00 PM
I have two projects on my test bench right now; Let me start with the math:

Xee2 has a series bifilar and a single wire coil of equal turns on two identical high perm cores.

The single wire coil measures 15.9 Milli-Henrys and the bifilar 16.8 Milli-Henrys of inductance.

We know that it takes 3600 Joules per second to generate 1 Tesla of magnetic force in a coil of 1 Henry of inductance, and that 1 Tesla is equal to 10,000 Gauss; Therefore:

16.8 mH divided by 10,000 equals 168 Gauss for the bifilar and 159 Gauss for the single wire at the following power input:

10,000 divided by 3600 equals 2.777. Multiplied by 168 Gauss equals 466.6 Joules per second or 466.6 Watts.

Multiplying the single wire Gauss by the same factor equals 441.5 watts.

Deducting the the 441.5 from the 466.6 gives us 25.1 watts.

So, the gain factor for the bifilar over the single wire coil with the high perm ferrite core is 25.1 watts. That's the power we would save to generate a magnetic field of identical force with the series bifilar wrap over the single wire coil of equal windings.

Bistander maintains the 5% difference in inductance measured by Xee2 between the series bifilar and single wire coil of equal turns and wire gauge is a result of the connection between the two bifilar coils. He may be correct, but the single wire coil has no way to benefit from this advantage, and clearly demonstrates a "Marked Difference" between the two types of coils!

Reply to bistander:

"I made the point that a more tightly wound coil would generate a stronger field than a sloppily wound coil of equal wire gauge and turns for the same input. Lets say the difference in inductance was 5%. We could equal the strength of the sloppy coil with the tight coil by reducing the input by 5%, right?

Lets say we feed 10 watts into both coils: We would gain 1/2 watt in savings, right? 100 watts would result in 5 watts savings and 500 watts would result in 25 watts savings, got it?

My power input calculations result in a savings of that amount with that amount of difference in inductance between the two types of coils. You say I divided when I should have multiplied. Your approach would throw the answer off in the wrong direction by an "Astronomical Parsec".

I was asked for a simple explanation: Greater inductance results greater efficiency, got it"?

Bistander complained the coils were not wrapped on the same core. I'm replicating Xee2's test with the two types of coils on the same core right now, and have finished the two wraps and am currently testing for accuracy.

Here's a digital still shot of my two types of coils on the high perm ferrite rod, along with my magnifying glass holder and "VICI" inductance meter registering 27 degrees Centigrade on the temperature scale. That's 80.6 degrees Fahrenheit, about perfect!

Quote from: synchro1 on May 09, 2017, 11:40:39 AM
Bistander maintains the 5% difference in inductance measured by Xee2 between the series bifilar and single wire coil of equal turns and wire gauge is a result of the connection between the two bifilar coils. He may be correct, but the single wire coil has no way to benefit from this advantage, and clearly demonstrates a "Marked Difference" between the two types of coils!

Reply to bistander:

"I made the point that a more tightly wound coil would generate a stronger field than a sloppily wound coil of equal wire gauge and turns for the same input. Lets say the difference in inductance was 5%. We could equal the strength of the sloppy coil with the tight coil by reducing the input by 5%, right?

Lets say we feed 10 watts into both coils: We would gain 1/2 watt in savings, right? 100 watts would result in 5 watts savings and 500 watts would result in 25 watts savings, got it?

My power input calculations result in a savings of that amount with that amount of difference in inductance between the two types of coils. You say I divided when I should have multiplied. Your approach would throw the answer off in the wrong direction by an "Astronomical Parsec".

I was asked for a simple explanation: Greater inductance results greater efficiency, got it"?

Bistander complained the coils were not wrapped on the same core. I'm replicating Xee2's test with the two types of coils on the same core right now, and have finished the two wraps and am currently testing for accuracy.

Hey Sync
What are we measuring the inductance with to see the difference or is it a calculated value? Seems most are getting the same value but 5% could be possibly nicked off as they are really close sooo.  But if that little difference no matter what % is mostly more for the bifi then you may have something. But is there any advantage to the small increase of inductance in the bifi?

Mags

Sync, can u post a circuit from Bistander? Im just wondering what he is doing

Mags

Mags,

My test measurements are .35 mH for the single wire coil and .38  mH for the series bifilar  on the same high perm ferrite core;. This is very close to the ratio measurement I got between the two air core coils, around 10%. Both these measurements were made with my Vici inductance meter pictured above with the coils and magnifier. This is a brand new meter with a fully charged battery!