Single layer Spiral coil

[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

[Aziz]

Here it is.

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

Aziz

[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...

[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

[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

[Aziz]

Tinkerer,

optimizing isn't useful (see below).

Cheers,
Aziz

[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]

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

See below.

[Tinkerer]

Keeping the distance of the 2 bundle coils at about r/2 or r/3 should be OK then.

Thanks Aziz

Tinkerer

[Aziz]

High resolution.

[Davor]

Yesss! That's it. A blue dot in between (to place PCB etc.)
I kinda hoped to see joining of the fields underneath in a middle a bit more pronounced, but there I have it. If you could be bothered a bit more, could you slant the coils a bit, so that the field domains get a bit more focus in a middle? I have no idea how much will be OK, but I guess just a little, some 10° each or something.

I'm thinking of a hydrodynamic drag to fit with self-contained MD, completely intrinsic with batteries and all, watertight and balanced to almost float in water to be pulled near seabed or a river bed. The most complicated bit was - where to put electronics. Now I know. Thanks.

[Aziz]

Keeping the distance of the 2 bundle coils at about r/2 or r/3 should be OK then.

Thanks Aziz

Tinkerer

r/2 taken + high resolution

[Aziz]

Davor,

10 Degree rotated at y-Axis (symmetric)
Right so?

[Davor]

Yes, but no cigar Domains are not joining. There is something happening above, a minimum is pushed somewhat, but I think more slant will not be practical, at least for my purpose. It seem that more slant will not do much.

This is the very reason I am seeking a visualisation software that will run as smooth as it does for you.

Anyway, I got what I was looking for: a cold spot between coils to put kit and caboodle for underwater ... thing.

[UFO]

That's pretty cool.