Tesla's "COIL FOR ELECTRO-MAGNETS".

[synchro1]

Well I could do the test with my own small coils , but I see no real point, the coils both have the same DC resistance and both have the same inductance and cores (iron powder rods), both coils will see the same current and create the same magnetic field. I'm reluctant to waste another night dong what others have already shown that I agree with.

Which is that when a continuous DC current is sustained through the two different coils they will behave the same, should be as exactly the same as is possible considering build tolerances.

I'm interested to see if there are any efficiency differences between some higher inductance, fairly high resistance (relatively)  coils of both monofilar and bifilar coils when excited with a frequency and loaded in various ways to various levels. One way to load a spiral AC electromagnet would be with a steel plate. A way to load a regular solenoid electromagnet might be to use it as a mechanical oscillator drive or something.

Of course my use of the general  term "resonance" is wrong when talking of simply tuning a systems L or C to get maximum power through a load on a "tank".

Tesla did not use the term resonance in the patent and I can accept I used the wrong term, if resonance played a major part he would have said so in the patent as he was not afraid to use the term. I will change my language in future to say simply tune the circuit.

Cheers

 

The serial bifilar coil generates a quarter million times the potential between the windings as the monofilar. How can you overlook this overwhelming difference? All you refer to is the D.C. resistance and inductance. What about the enormous difference in Hi-Voltage potential? I drummed this in relentlessly. Pay attention! The Tesla serial Pancake coil was pateneted as an iron ferrite MAGNETIZER COIL! The coil magically transmutes iron into a permanent magnet!

Now, if you plan to do the experiment, why not take a trip to the hardware store and buy the 16 penny nail that "Tesla-Coil-Builder" calls for, and use the correct gauge magnet wire stipulated by him. You're going too far afield by improvising materials. This grows very complex with the core reluctance and number of wraps etc. If you do the test like he instructs, you'll get the correct results. A zinc or nickel or chome plated bolt won't magnetize like a soft iron nail. All you'll be left with is the coil's field strength like in Magluvin's test.

[synchro1]

Here's a very simple experiment for someone like Magluvin who just wrapped a few spiral coils. I'm ill equipped to perform this one.

Place the serial bifilar pancake on two different metal plates, one at a time, one iron and another aluminum perhaps or any two different metal plates and check the SB pancake coil's inductance in Micro Henries. Then repeat the test with the monifilar. The serial bifilar's inductance is supposed to change due to the high potential between the wraps and the difference in conductivity of the metal plate in adjacency. Repeat the experiment with the monofilar and compare any change in inductance. This is testing the serial bifilar pancake as a magnetizer sensor! The serial bifilar pancake coil is very sensitive compared to the monofilar! Remember, it spontaneously generates 250,000 times the hi-voltage electrical potential between the windings than the single wrap! This power doesn't count for nothing!  This is where to find the MAGIC!

[conradelektro]

@Farmhand and the experts:

I just watched Farmhand's video https://www.youtube.com/watch?v=c6nP1HekThc (ring transformer) and it reminds me of an experiment I did last Thursday with my large bifilar Bedini coil (which I posted here http://www.overunity.com/13460/teslas-coil-for-electro-magnets/msg383363/#msg383363).

MileHigh mentioned that I can use only one wire (of the large bifilar coil) to have a comparable monofilar coil (with 1/4 of the inductance). I measured the inductance of each of the two wires, see this post http://www.overunity.com/13460/teslas-coil-for-electro-magnets/msg383374/#msg383374 . The inductance of one wire is indeed 1/4 of the inductance of the wires in series (measured with my LCR meter).

So far so good. Then I tried to measure the self resonance of one wire with an exciter coil wound around the bifilar coil. It is the same exciter coil (4 turns of white wire) I used to measure the self resonance of the wires in series (see the photo attached to the first post mentioned above, the exciter coil was simply left in place).

And, I could not measure the self resonance of just one wire with the exciter coil. And, I could not measure the self resonance of the two wires connected in parallel with the exciter coil. (Coil had no core, air core.)

I tried a lot, but no success. It seems that the exciter coil can only "excite" the big coil if and when the two wires are connected in series.


Then I had to stop experimenting (no more free time) and can only do more tests on Monday (I am not at home ).

I write it, because farmhand showed a similar strange measurement over one wire of a bifilar winding and over the wires of a bifilar winding in parallel (on his big ring core in his video).

Greetings, Conrad

[MileHigh]

Conrad:

Perhaps the self-capacitance is so low that the self-resonant frequency is much higher than you were expecting?

MileHigh

[MileHigh]

Now, if you plan to do the experiment, why not take a trip to the hardware store and buy the 16 penny nail that "Tesla-Coil-Builder" calls for, and use the correct gauge magnet wire stipulated by him. You're going too far afield by improvising materials. This grows very complex with the core reluctance and number of wraps etc. If you do the test like he instructs, you'll get the correct results.

These are classic "secret sauce" arguments.  It has to be the right wire, etc.  Those are to be judged on a case-by-case basis.  In the majority of cases the "secret sauce" arguments aren't true.  They are a classic technique used by con artists also.  I am not implying at all that Synchro1 is a con artist because he is clearly not.