DD coil for 3D printing with easywind coils.

[moodz]

Here is the STL for a DD coil with easywind coils. ( zip files attached ) - created by openscad using AI and vibe coding.

20 cm x 2.5 cm

[Carl-NC]

One thing you want to do is create 90° overlaps, this minimizes the parasitic coupling and gives a deeper R Null.

[Aziz]

One thing you want to do is create 90° overlaps, this minimizes the parasitic coupling and gives a deeper R Null.

I am also thinking of to support such complex coil shapes in my coil software.
Best described with a reference point and successive polar coordinates (angle, radius). Round edges and better DD coils can be modelled.

This would be a great feature I think.

[moodz]

Easy wind coil former for 3D printing with X crossings.

[Carl-NC]

There ya go!

[JoyJo]

Here is the STL for a DD coil with easywind coils. ( zip files attached ) - created by openscad using AI and vibe coding.

20 cm x 2.5 cm

Shouldn't the coil be in the same plane? The bends of the coil affect the distortion of the field.

[JoyJo]

One thing you want to do is create 90° overlaps, this minimizes the parasitic coupling and gives a deeper R Null.

And what is the Rnull parameter? How does it affect and what does it depend on?

[Carl-NC]

Shouldn't the coil be in the same plane? The bends of the coil affect the distortion of the field.

It won't make much difference. Personally, I'd just keep the TX coil flat and allow it to be slightly elevated.

And what is the Rnull parameter? How does it affect and what does it depend on?

Normally the magnetic null is purely reactive (X) and you can theoretically null it to absolute zero (X null). But capacitive coupling injects some out-of-phase signal and its resistive (R) component limits how deep you can null the coil (R null).

[moodz]

..well for those who insist on winding coils on the same plane
Below is the Version 4 ... Easywind planar coils.

[moodz]

Here is the matching coil cover for the planar Easywind coil former.

[JoyJo]

..well for those who insist on winding coils on the same plane
Below is the Version 4 ... Easywind planar coils.

In this version, the coils will not be able to move relative to each other. How to adjust the residual imbalance?

[moodz]

In this version, the coils will not be able to move relative to each other. How to adjust the residual imbalance?

If you take some factory coils apart you will see they dont have moveable parts ... they use gimmick windings.

[Carl-NC]

With DD coils you often have the ability to move the windings and get a good first null, and then use a tweak loop for the final null. With a few iterations, the bobbin in post 9 can probably get the overlaps close enough that the mechanical first null isn't needed.

Paul, was all of this done with AI?

[pito]

How to adjust the residual imbalance?


metal objects around the coil for balancing

[moodz]

With DD coils you often have the ability to move the windings and get a good first null, and then use a tweak loop for the final null. With a few iterations, the bobbin in post 9 can probably get the overlaps close enough that the mechanical first null isn't needed.

Paul, was all of this done with AI?

All done with AI ... I took source code for openscad on github and got the AI to "bolt" an AI command interface into the code.
Recompiled it and now the AI can do everything the GUI / script editor can do but importantly the AI can manipulate and "see" the
3D model space ... so its quite weird to watch the AI spinning, zooming the model then making changes by itself.

I did ask the AI to set the base geometry so all things being equal a null could be achieved with only minor tweaking of the coil structure.

The hardest part is using the right language so the AI can understand what you want. Ferinstance discribing the X crossings took a bit of dialogue but
making the coil cover was simply "build a conformal coil cover with mounting tang" ... an that was it.