Delayed Lenz or not?... post your explaination!

[tinman]

There is an electric field in the core when there is changing magnetic flux at right angles to the direction of the flux.  That's what causes eddy currents.  However, you can't actually measure the voltage due to the electric field because of the CEMF generated by the eddy currents.

I don't get what you mean by the capacitor though.  Do you mean a literal capacitor, or are you using the term "capacitor" as a model for the energy in the transformer core?

What's going on inside a working transformer core while AC power is flowing through it is an interesting subject open to debate.  It's somewhat hard to visualize because in a sense "nothing" is going on.  People smarter than me might have a definitive answer on that one.

The capacitor consist of one plate being the core,and the other plate being the copper winding's. the voltage and current between the two is very measurable and quite cappable of running an LED. If you have two pulsed inductors with laminated cores that are 180* out of phase with each other,you can draw AC power from the two isolated cores alone.

[MileHigh]

There are all sorts of transformer models showing parasitic capacitances and parasitic inductances, etc.  It depends on how deep and detailed you want to get.  Typically the deeper you go in the modeling the higher the frequencies are that you are considering.  In almost all cases at the normal operating frequency for a typical transformer you can ignore the parasitic components.

The important thing to keep in mind is when the parasitic components should be part of the discussion and when they can be omitted from the discussion.

[MarkE]

I'm going to take another stab at this because I am not sure of myself.  It gets complicated because you have an electric field that travels in a closed loop.  Electric fields are not "supposed" to travel in closed loops, they are supposed to go from point A to point B.  When you go around the closed loop you are back at the same voltage.  So therein lies the complicated part, the "paradox" if you will.  When you travel along an electric field you are always supposed to measure a voltage between point A and point B.

So my correction is this:  When you have eddy currents, it's due to the presence of an electric field, but you can's actually measure a voltage between two points along the circle.  It's because the electric field and the CEMF field exist at the same time and in the same place everywhere along the circle.  So you can see the effects of the electric field, the eddy currents, but you can't actually measure a voltage between to points on the circle.  Nor can you measure an electric field along the circle.

It's very similar to the enigma of the issue of measuring the electric flux, or B field, inside the core of a working transformer.

Non-zero impedance means that a voltage does develop across the conductor.  If you anchor a probe at some point on the surface and then move the other probe in the direction of the eddy current, you will observe a voltage that increases in magnitude to the half way point and then comes back down to zero. 

[synchro1]

Non-zero impedance means that a voltage does develop across the conductor.  If you anchor a probe at some point on the surface and then move the other probe in the direction of the eddy current, you will observe a voltage that increases in magnitude to the half way point and then comes back down to zero.

Insulated silicon steel laminations like JLN used cut the eddy currents down to practically zero. There's a difference between an "Ideal" transformer and a practical one. Everything carries some level of electrical charge. This factor is too trivial to consider as part of an overall analysis of the fundamental operating principles of Transformers. Only "magnetic flux" exists in the core of the "ideal" version. Like the Op Amp law that no current passes through the inputs.

Here's another fine video from Gotoluc:

https://www.youtube.com/watch?v=rUmVSf878aY

Luc clearly shows no rise in input with the addition of a load.

[gotoluc]

Thanks Synchro for posting that video!... I forgot about it as it was done back in 2011.

I made that video in my sailboat  lol

This is an example of one of Thane Heins ReGen-X coils he lent me so I can test a solid state version using my H-Bridge.

The input to H-Bridge was 62.5vdc @ 0.00829 Amps = 500mW
H-Bridge Frequency was 480Hz
I would say the 79 Ohm DC resistance of Shaded Pole motor coil (primary) was consuming most of that 500mW input
we can see the secondary (regen-x) coil output has 4.11vrms across the 150 Ohm load resistor = 112mW which had no effect on the input power when place under load.

Good example

Luc