Lenzless resonant transformer

[Jack Noskills]

Updated pdf with some new information after some testing.


Does anyone have a 1:1 transformer and some capacitors laying around ? If so, then you should read chapter 6 and do the simple resonance test described there. You should get reverse operation of transformer: more power you take, less power will be used.

[Farmhand]

Updated pdf with some new information after some testing.


Does anyone have a 1:1 transformer and some capacitors laying around ? If so, then you should read chapter 6 and do the simple resonance test described there. You should get reverse operation of transformer: more power you take, less power will be used.

That's an effect of increased Lenz effect at no load which is reduced by the load due to less tank current when loaded. Definitely not Lenzless. It's the same effect as the acceleration under load and it's next to useless. Show us some input and output power measurements. Or the difference in power available when in that mode and when not like I do in this video. near the end I show it can power loads when used in a reasonable manner.

Video clip of reduced input when loaded of transformer, a big reduction, but the output is limited by doing that.
http://www.youtube.com/watch?v=Zxde9qga79c


I've got almost 150 video experiments in the bank and 1000's actually done, and I take some measurements although usually I'm not as interested in accurate measurements as getting to the truth and understanding the effects.
..

Cheers

[Jack Noskills]

I did not say that circuit in chapter 6 is lenzless. I just think that it is interesting effect.


I could measure the heat of the halogens at both sides using a thermal scanner, but it would not be very accurate. It is enough that primary halogen does not burn my finger but the output halogen does.


EDIT:
I briefly watched the video, not all of it as I don't have time at the moment. Nice setup indeed and I see you are a pro. Good.


You did not use resonant caps in this test ? Have you done setup that is similar to what I did (the chapter 6 circuit) in some other builds ?

[Jack Noskills]

Realized that editing existing post does not trigger notification, so Farmhand, can you answer my questions ?


My input halogen was 5 watt/12 volt and output 10 watt/12 volt.

[Jack Noskills]

Test done by itsu, testing resonance effect in a toroid using two similar overlapped coils. Differs from my tests where coils were separate and on opposite sides of the toroid. But an interesting test result still.

[/font]Ok,  i toke a shot at this.Single ferrite core (6.5cm od) dual speaker wire (stranded 22 awg) wound twice around the whole circumference meaning 60 turns.So we have a primary coil of 60 turns with 4mH and 0.2 Ohm and a secondary coil with 4mH and 0.2 Ohm.2 capacitors of 220nF are attached to both coils which should give us a resonance frequency of about 5.3KHz according to http://www.1728.org/resfreq.htm. Measurements confirm this, but resonance is very broad. Bulbs used are 6V.It turns out that in this situation we do not have a synchronious resonance on the primary and secondaryPrimary resonance (input bulb off) is at 2.9KHz, while secondary resonance (output bulb lit) is at 7.8KHz.Using another set of capacitors (7nF) shows similar behaviour, but on a higher frequency.I think this is not the correct thread for this, but i leave it to jack if he want to move this to one of his own threads on this subject.Video here:  http://www.youtube.com/watch?v=aOX0tqgnD_w&feature=youtu.beRegards Itsu

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