Confirming the Delayed Lenz Effect

[ramset]

Boss,
Does this work?

http://www.overunity.com/index.php?topic=11455.msg301981#msg301981

Chet
PS
If Not
Click on Forum link
Scroll to news section  "click"
Look up top right for "new Topic"   "Click"


Wallah..........
PPS
I didn't put the UnderNudity flag in??
And I see our OverNudity Flag is Missing??? [do we have one?]

[CRANKYpants]

Boss,
Does this work?

http://www.overunity.com/index.php?topic=11455.msg301981#msg301981

Chet
PS

Wallah..........
PPS
I didn't put the UnderNudity flag in??
And I see our OverNudity Flag is Missing??? [do we have one?]

THANKS RAMSET!

ASK IRON TO SEND YOU A PICTURE OF THE OVERNUDITY POSEE DON'T POST IT THOUGH AS IT MAY OFFEND SOME HORSE LOVERS.

CHEERS
T

[gotoluc]

Hi everyone,

I have an update.

I removed the 4013 Flip-Flop from my H-Bridge and connected the two outputs of a SG3525 PWM which does flip flop but with pulse with adjustment.

Works great ... so I now have an H-Bridge with adjustable Frequency and Pulse Width

See below (basic) schematic I found on the internet and made some small mods like a rotary switch to be able to select different cap values to change Frequency range and also have 2 pots in series (one high resistance and one low) to be able to fine tune Frequency once in range where you want it.

I started testing the MOT by reducing the pulse width and found it was reducing the Secondary Current output in a linear way. So not much was wasted with the prior 50% duty cycle.
However, I found that as I reduced the duty cycle I noticed I could drop the Frequency and still get the same effect (not affecting the Primary Current) with load on the Secondary .
I was able to drop the Frequency down to 60Hz but the duty cycle maybe at 1% more or less. It's just at the minimum pulse width output of the SG3525 but it does work. See scope shots below.

Green Probe across Primary and Yellow Probe across Secondary
First scope shot is Primary @60Hz with 63vdc @740ua with 1% duty cycle and Open Secondary
Second scope shot is Primary @60Hz with 63vdc @740ua with 1% duty cycle and 22 Ohms load on Secondary

My question is, at this Frequency and pulse width does this still work with Overunityguide's Lenz Delay explanation?

Luc

[gotoluc]

maybe this effect manifests at an even higher frequency than 2MHz for this kind of transformer. How high frequency can you go up to with the signal generator I wonder. 
IT is sure the 7.5H winding on this toroidal core has got a much less self capacitance than in case of the MOT's secondary and I am also sure the laminated core in the MOT fails to maintain its permeability in the kHz range and starts diminishing significantly and nonlinearly.

Gyula

Hi Gyula,

my Signal Generator is 2MHz Max.
I had already tested the Ferrite Toroid with my H-Bridge without success so I decided to try it with the output of my SG.

At 2Mhz the effect starts, see Scope shots. However I have nothing else to test it with that has a Higher Frequency or output. Also, you can forget about using an H-Bridge at these frequencies.

Green Probe is Current across 1 Ohm and Yellow probe is Voltage
First Scope Shot is Ferrite Toroid Primary @2MHz with Secondary Open
Second Scope Shot is Ferrite Toroid Primary @2MHz with Secondary on 22 Ohm Load
Third Scope Shot is Ferrite Toroid Primary @2MHz with Secondary on 22 Ohm Load with Voltage Probe across Load

That's about all I can do at this time

Luc

[gyulasun]

Hi Luc,

it seems the input current gets reduced a little when the secondary coil is loaded with the 20 Ohm. So the 'effect' is there and surely at higher than 2 MHz frequency you could find a 90° phase difference between input voltage and current.
At 2MHz a wire wound resistor has got inductive reactance too which adds to the normal DC resistance value, causing the 1 Ohm to be a a little bit higher than 1 Ohm. The same is especially true for a 20 Ohm wire wound resistor because it must have more turns to get the higher resistance. This latter is which may count if someone attempts to calculate output power from the output rms voltage and the 20 Ohm values. Otherwise it does not matter much, only can slightly modify the resultant phase shift as an addition.  One more thing: if you happen to have a 10pF or max 22pF capacitor at hand, try to connect in parallel with the secondary, this can bring down the natural resonance of the secondary (7.5H) coil maybe under 2MHz.  IF you do not have any cap, you can twist two 15-20 cm long enameled or plactic insulated wire together, connect the two wires of one  end to the secondary and leave the other two wire ends of the twist open.  This would make a 15-25pF or so capacitor, depending on the tightness of the twist. You can also cut the length to reduce the 'cap' value.

Thanks for your kind efforts. 
Gyula