Rene/Meissner EMF Higher Voltage Charger Variant

[gyulasun]

Hello Seychelles,

Would you tell if you have already tested the ball magnet suggestion?
I ask because at first the spinning ball magnet idea sounds good: the friction of the ball is quasi negligibly
small on the hard glass surface and the air resistance is quasi ideally small.  On eddy current loss in the magnet:
well I am not fully sure on that but let's neglect it too.

Now to have an increase in efficiency of the oscillator setup, the spinning magnet should produce
more induced energy in the oscillator coil than the energy it takes from the coil for maintaining the
fast spinning.  Hmmm, this sounds interesting...So you may have found something interesting with
such tests,  I wonder?  I am open... and not nit-picking of course 
Thanks
Gyula

[gyulasun]

Hi SkyWatcher,

If you wish to check further on your 12 strand coil DC resistance, here is a good link on how to estimate less than 1 Ohm resistances in a simple way and with relatively good precision:
http://www.robotroom.com/Measuring-Low-Resistances.html 
It has a set of data at the bottom what resistance was calculated from the voltage drop measurements for instance for a 59 feet length of #14 gauge wire (0.153 Ohm) with respect to the expected range (0.136 to 0.159 Ohm).

Would like to show you an online air core coil calculator (you may be aware of it though). It is good because let you learn about several choices on wire gauge etc for just a chosen L inductance and includes the total wire lengths and DC resistances with differing coil radiuses which all give the same L inductance you entered. See here: http://www.colomar.com/Shavano/inductor_info.html
The program was made for air cored audio crossover coil calculations so the mechanical sizes for the coils are relatively big, though you may prefer such now.
It can give a good and quick overall view what can be expected 'size-wise'.

Here is another, similar calculator which (also for a given L inductance) let you choose bobbin's inner diameter and coil length for a wire gauge you choose. This calculator (or similar other multilayer ones online) can extend the size range limitations of the above crossover coil calculator if needed, that is all. There is an acceptable difference (5-6%) between the results of the two calculators.

Regarding on your pondering the use of insulated wire for coils, do you mean stranded copper wire?   like this:
https://en.wikipedia.org/wiki/Wire#/media/File:Stranded_lamp_wire.jpg or an insulated single wire? Unfortunately, it is hard to find a fairly thin insulation for making coils, maybe the use of the several strands of enameled copper wire is the good choice. Other insulation types may take up too much space when making multilayer coils, this may or may not cause further problems in coil performance.

Gyula

[SkyWatcher123]

Hi all, Hi gyulasun, than you for the very helpful web links, i will be using that resistor circuit to measure this 12 strand coil.
And the air coil calculator may come in handy.

I was thinking, maybe some 14awg. stranded copper house wire, might have a thin enough insulation to be useful in a large air coil and might give better charging performance.
Otherwise, i did find a spool in the closet with about 3 more pounds of 24awg. magnet wire.
The thing is, i was thinking about others that may find my ideas useful and I was wanting to make it easier to find the materials and make it easier to build.
Because building a 12 strand coil or greater is not very easy, if a large gauge off the shelf coil material could be used and maybe even give better performance, then it would be good.
It doesn't necessarily have to be some monstrous coil, maybe only a 2 pound coil would work well, testing would be needed.
Your thoughts appreciated as always.
peace love light

[SkyWatcher123]

Hi all, so was just looking at some house wire at menards.
Looks like for $20, can get 100 feet of 12awg., which works out to .17 ohms at 1.98 pounds.
And $25 for 100 feet of 10awg., for .1 ohms at 3.14 pounds.
Not too much cost to try this experiment.
Then i will use the air coil calculator, to get the best geometry.
Does anyone think one of these coils would work well enough to try.
peace love light

[gyulasun]

Hi SkyWatcher,

I think a test coil from 12 AWG 100 feet wire could be risked.  Unfortunately I cannot comment this, have not made coils from such house wire.  I assume you choose the stranded wire instead of the solid type? 
Speaking of coils, there are crossover coils both with air and so called solid cores and maybe it is worth seeing such to get a feel on DC resistances and sizes and L inductances: https://www.parts-express.com/cat/crossover-inductors/296   

How do you mean to get the best coil geometry with the calculators?  Can you see such feature in them?  In the first link the program itself creates the sizes for the different wire gauges to achive the entered L inductance and in the 2nd link the user can enter certain sizes beside the L inductance.   Just curious, I do not know what geometry would be optimum here...

Gyula