Rene/Meissner EMF Higher Voltage Charger Variant

[SkyWatcher123]

Hi all, i ran another test with the 12 strand coil and ferrite tube core.
This coil is more efficient than the house wire coil.
Efficiency worked out to 100.1 %.
So the 12 strand coil is very efficient, more likely because it is using the magnet wire, with the copper wires closer to each other or tighter windings.
Used the multiple data points as previous test.
Will make another test with this same setup, to see if it is consistent.
peace love light

[SkyWatcher123]

Hi all, so i decided to try something a little different.
I took the 12 strand coil with ferrite tube core and placed it on top of the 10awg. coil with ferrite tube core, with the coils wired in series.

I wasn't absolutely sure which way was the proper magnetic field polarity orientation, for the top 12 strand coil,  so i went with what seemed to give the best output for input and cleanest audible tone.

I ran a previous test, with this arrangement, with a ferrite tube only about 25% into the 10awg. coil former, which yielded 102.4% load test efficiency.

The latest test, with both coils having full ferrite tube cores, yielded 102.7% efficiency.
So it seems interesting, is it the added copper mass that is giving higher efficiency and if we used a normal magnet wire coil instead of the insulated THHN house wire, would we get even higher charging efficiency.
The coils add up to about 3.2 lbs. of copper as it is.
What if we used 10 lbs. of magnet copper wire, hmm.

I am pretty confident of the numbers data.
As in the latest test, i used the 8 data points for the discharge of the 20 ohm resistor and 4 data points for the charging phase.
Since the amperage input did not waiver from .18 amps and is stable at 20 volts from the boost converter.

Out of curiosity, i am going to raise the voltage to at least 25 volts input and compare the charge/ load test efficiency next.
Thoughts welcome.
peace love light

[gyulasun]

Hi SkyWatcher,

In your last but one post you wrote: "i ran another test with the 12 strand coil and ferrite tube core.
This coil is more efficient than the house wire coil. Efficiency worked out to 100.1 %.
So the 12 strand coil is very efficient, more likely because it is using the magnet wire, with the copper wires closer to each other or tighter windings."

I think it is mostly the insulated-from-each-other wires in the 12 strand winding that is useful, together with what you wrote on the closeness to each other versus the house wire coil in which the number of strands are 19 (as you wrote) but they are uninsulated copper wires directly touching each other and the thickness of the PVC insulation on the 19 strands maintains 'air gaps' in the magnetic field. These "embedded" air gaps may or may not affect the strength of the magnetic field created by the input current, only tests can reveal this, my take is the field strength is probably less than with tight windings.

Regarding your latest test, you wrote:
"So it seems interesting, is it the added copper mass that is giving higher efficiency and if we used a normal magnet wire coil instead of the insulated THHN house wire, would we get even higher charging efficiency.  The coils add up to about 3.2 lbs. of copper as it is. What if we used 10 lbs. of magnet copper wire, hmm." 

Well, what you deduce sounds good and acceptable at first. We need to consider though the position of the two coils: they are coupled in a magnetically aiding fashion i.e. they together must have higher resulting L inductance than just adding the L1 and L2 inductances of the 12 strand coil and the house wire coil together due to their series connection. It is sure you eventually connected them correctly in series, their fields aid each other as if they were quasi a common continuous winding, otherwise the resulting inductance would be much less than the sum of them (plus the M mutual inductance) and this would have surely manifested in an input current increase at first if you happened to notice such? 

So it is not so sure (well I am not so sure) that the role of the copper mass is: the more the better. 
What if you had say a metglas core having a permeability of say 50000 instead of the say 800-1500 for the ferrite cores? That would mean the same L inductance could be had just with less copper for the winding, so just the opposite tendency it seems. I am not against using more copper of course but there are other factors I try to mention for consideration.

I thought drawing your attention this simple LC meter for you :
https://www.ebay.com/itm/LC100-A-High-Precision-Digital-Inductance-Capacitance-L-C-Power-Meter-Board/401382330899?hash=item5d74405213:m:mf8zDmlZ5r4DO7Jb87gUOAg     

Gyula

[SkyWatcher123]

Hi gyulasun, thanks for the reply and helpful information and the inductance meter link.

I just swapped the top coil around the other way and it does draw slightly more, though is more quiet.
I'm going to make a test at 25 volts, with the top coil swapped around this way, which is probably bucking, just to see.
peace love light 

[gyulasun]

Well, you can check the magnetic poles by a compass if you feed a low level DC current into the coils and then orient them accordingly.   Or check the winding sense of the two coils by eye if it is simpler.