Lenzless transformer

[Jack Noskills]

I did some experiments using ferrite E-I core and I could take power from it without any visible effect at the source. I could not measure it exactly as I used two similar halogens. I got one in the primary side and similar bulb as a load.


E-I has three legs, so I wound one layer of 0.31 mm enamelled wire on each leg and used same number of turns. Winding direction most likely does not matter but I used CW-CW-CCW, so outer legs were opposing. These I then connected together in parallel so that polarities match and it was connected to load.
Primary was then wound all over the core so that is covered all three inner coils. Idea is that those inner coils form magnetic loop while the outer driving coil does not form a loop.


Primary magnetizes the core and current begins to flow in inner coils. As there are loops all inner coils amplify each other. Now the flux goes through the primary once from the left side and once from the right side, thus total effect is zero on the primary.


There must be power circulating in the primary so parallel capacitor should be placed in the primary to get reactive power circulating there. I was unable to make resonant circuit so this is were you the experimenter come in. See if this can be tuned so that only reactive power is used.

I used audio amplifier so I could get upto 20 kHz AC input. My core was such that I begin to see power out only after 15 kHz. If any of the coils were not connected there was not enough power to light the output bulb.

Other options
Put resonant capacitors in the smaller inner coils, so there will be two identical tank circuits having C and L. Output is then taken only from the middle leg and put resonant series capacitor there. If the center leg is larger then you need to adjust difference in L using lower valued C. Idea is to get resonant rise in the capacitors so that output power is increased.


Having succeeded in the above, raise the voltage in the input side to get more reactive power circulating.


Good luck experimenting.

[Jack Noskills]

Below a picture of the resonant version. One option is also to connect outputs so that all of them go to load via series capacitor.

[DilJalaay]

Hello and thanks for starting string.


i would like to see your actual setup.
i need to know the dimension of your EI core also number of your winding,
as i am going to replicate your setup, so we could share our calculations.

So far, I manage to get and ferrite E-E core for my experiment.

Thanks and regards,
D.J

[Jack Noskills]

You core looks to be of same size as mine. I got mine from a broken printer, had to do some grinding because it had airgap. I don't have camera at the moment.


I was able to put about 50 turns in each leg. Turn count does not matter, it was just my initial test. When output coils are placed in parallel it is important to have same amount of turns in each coil. In primary I also used about 50 turns so I could get 1:1 action.


I am thinking to add more turns in the center, output power should increase. First I double it and use the same amount of turns in primary coil to see what is the effect. If it works better then I could try add as much turns as possible and see if I can get light in a 220 volt light bulb.


I got visible power only beyond 15 kHz so this means input power depends on frequency so it is a good start. I think it depends on voltage in the primary also, maybe we can find this out.


I hope you have scope so we could see pictures.


Thanks for joining in, this should be interesting.

[DilJalaay]

Ok some progress i have made so far...