Quote from: itsu on July 04, 2019, 11:52:56 AM
I was wondering why the magnetic coupling between the big coil and a small coil is how it is, meaning why
is there a maximum in the middle when both coils are vertical and why is there a minimum in that same middle
when the small coil is horizontal?

Maybe if you combine two, vertical and horizontal, position will not be important, and it will react the same in any position?

   itsu:   What happens if you place the small coils inside the big coil? As there are more losses outside the big coil, in field strengh.

So the questions are, are those drawings representing what is happening, are if yes, are they the totality, and does all the energy transfer from primary to secondaries in a way that no gains are possible? Is there any point in asking these questions?

Quote from: Jeg on July 04, 2019, 12:38:17 PM
Itsu
Looks like one position traces voltage nodes/antinodes and the other position current. Nice tool!

That is the most important consideration Nick. But that is the advanced process. As I said, you can do the Don Smith L2 arrangement that way, which receives all the flux through it, while still doing the same things we are doing here. But there are a lot of relationships to consider as you can see in the Resonance transformers book and elsewhere...

Quote from: NickZ on July 04, 2019, 01:00:46 PM
   itsu:   What happens if you place the small coils inside the big coil? As there are more losses outside the big coil, in field strengh.

Hi Jeg,

i think you are talking RF not magnetic field.
The RF field is strongest at the top of the big coil, see my latest video above.

The magnetic field however is like shown in the drawings.



WhatIsIt,

thats a different animal alltogether, but could be fun to try it out.



NickZ,

i tried to put the smaller coils inside the big coil (does not fit completly with the pcb and led attached),
and as expected, the fields there are the strongest.

Itsu