Single layer Spiral coil

[Davor]

Specifiy the number of turns, starting radius, ending radius and the distance of the two spiral coils.
Aziz

With outer coil diameter being 1, I wish to see coils at rim to rim distance of 0.42, while for other parameters you may use anything you wish, say d/D=1/3, say 20 turns or something

[Aziz]

Tinkerer,

optimizing isn't useful (see below).

Cheers,
Aziz

[Aziz]

Boy! you are fast!

If I may be picky, a tandem with counterphases, in single layer spiral, as per Tesla. Boy! It must be interesting! I am especially interested in spirals that are separated by D*(√2-1), or a little bit more.

I am thinking of self adhesive aluminum tape rolls as a perfect spiral coil solution. I'm not sure how practical it could become, but if it is viable, perhaps it will be the most straightforward method of obtaining matched coils in the Universe. I'd be very surprised if it was not tried before, but who knows...

Specifiy the number of turns, starting radius, ending radius and the distance of the two spiral coils.
Aziz

[Tinkerer]

Beautiful graphs! Thanks a lot.

I think the separation between the 2 coils is critical. Could you try to find the best position?

It will probably be proportional to the coil diameter.

It may also depend on the field strength.

Thanks again

Tinkerer

[Davor]

Boy! you are fast!

If I may be picky, a tandem with counterphases, in single layer spiral, as per Tesla. Boy! It must be interesting! I am especially interested in spirals that are separated by D*(√2-1), or a little bit more.

I am thinking of self adhesive aluminum tape rolls as a perfect spiral coil solution. I'm not sure how practical it could become, but if it is viable, perhaps it will be the most straightforward method of obtaining matched coils in the Universe. I'd be very surprised if it was not tried before, but who knows...

[Aziz]

Here it is.

I have taken two of the standard mono coils (300 µH) and seperated them.

Aziz

[Tinkerer]

TANDEM COIL

Hi Davor,

you are still after a "sexy" coil software.

If you have a specific coil idea in mind, you can suggest it for a coil analysis.

The only condition is, that it must be discussed and published in the public domain. If it has some merit, it shouldn't be patented either (Patent trolls!, go to the hell please! Thank you. ) . We the (honest and peaceful) folks share our ideas and inventions together. Sharing is a good thing and it kills the evil greed.

Do you have something to share with us?
It would be a pleasure to me, to help you and others.

Cheers,
Aziz

Hi Aziz,

thanks for offering your help.

Intuitively the TANDEM COIL has some specific advantages. Vertical targets give a weak response with traditional coils. With the TANDEM COIL, there is a large field vector that would hit a vertical target on it's side and should therefore generate a stronger response.

The TANDEM COIL also allows for an interesting variation of RX coil combination. One could use a single rectangular (or center tapped) coil across the 2 TX coils, where the physical structure would be reinforced as well as the RX would be balanced.
Another variation would be 2 RX coils, one in the center of each TX coil.
Another variation would be 3 RX coils, one at the center of each TX coil and one across the center.
There are many other variations possible, including anti-interference variations.

I did build a TANDEM COIL some years ago and was very satisfied with the performance.

Would you be so kind, to run a TANDEM COIL model in your software?
I think the basic coil disposition should be with the 2 coils aiding, but the 2 coils opposing also has some (different) merit.

All the best

Tinkerer

[Davor]

you are still after a "sexy" coil software.

Just found it, thanks Tinkerer. The script works like a dream. It would be a tad better if I could enter my own coil designs.

I'll have your kind offer in mind when I manage to design something that is not already in use /patented /misunderstood etc.

This tandem coil thing with counter phases (a torus stand-in) works exactly as I imagined it, and I think it must work well in "monocoil" solutions.

[Aziz]

I really like your visualisations very much, and I still wonder what software produces them :wink:

Hi Davor,

you are still after a "sexy" coil software.

If you have a specific coil idea in mind, you can suggest it for a coil analysis.

The only condition is, that it must be discussed and published in the public domain. If it has some merit, it shouldn't be patented either (Patent trolls!, go to the hell please! Thank you. ) . We the (honest and peaceful) folks share our ideas and inventions together. Sharing is a good thing and it kills the evil greed.

Do you have something to share with us?
It would be a pleasure to me, to help you and others.

Cheers,
Aziz

[Davor]

Here you can download free applets for all sort of visualizations. Excellent site.

http://www.falstad.com/vector3dm/

Enjoy

Tinkerer

That's more like it! That's exactly a tool I was thinking about: no learning curve at all

Thank you very, very much!

[Tinkerer]

I really like your visualisations very much, and I still wonder what software produces them :wink:

The Avatar is from a magnetic field visualization made by MIT. I think they use MAXWELL, BY ANSOFT. Ansoft used to distribute a free 2D magnetic field software Maxwell 2D. I think it is excellent but I have not had the time to really break through the learning curve.

Tinkerer

[Tinkerer]

Ah! So the tandem is a proper name. Thanks. Anyway, you can see a (somewhat squashed) toroid organisation of magnetic field in there. Exactly what I was talking about.

You have nice visualisations, including the one in your avatar. I am seeking some software without learning curves, and I hope you can recommend some. It is often straining job to picture all these configurations in my head.

Here you can download free applets for all sort of visualizations. Excellent site.

http://www.falstad.com/vector3dm/

Enjoy

Tinkerer

[Davor]

I really like your visualisations very much, and I still wonder what software produces them :wink:

[Tinkerer]

For a visualization of coil fields, compare the 2 pictures below.

With the current in the 2 coils running in the same direction, the fields are aiding.

With the current in the 2 coils running in opposed direction, the opposing fields repel.

A RX coil positioned in the position where the magnetic fields are rarefied, will sense only a weak TX. This is what we use to reduce the Flyback peak, in the RX. We call it a Bucking coil.

Tinkerer

[Davor]

Ah! So the tandem is a proper name. Thanks. Anyway, you can see a (somewhat squashed) toroid organisation of magnetic field in there. Exactly what I was talking about.

You have nice visualisations, including the one in your avatar. I am seeking some software without learning curves, and I hope you can recommend some. It is often straining job to picture all these configurations in my head.