ABHA Rodin Coil Frame (Phi proportions, 36x36 pattern) by spard001

Last crawled date: 3 years ago

This design caters for the winding wire angle changes as it raps around the frame, eliminating wire bending.
It is a 400mm or 16" outside diameter ABHA Rodin coil frame and have 3rd order Phi proportions using Tom Barnett research to find the proportions. Here is his video https://youtu.be/kxuU8jYkA1k.
I provided the files for a 250mm, 10" coil frame too, in case you do not want to build a large one.
This is not designed for the Daniel Nunez type coil which has the cross winding and he calls it the POE Coil.
On the Tom Barnett video the smallest inner toroid I call the 1st order coil and the one bigger is the 3rd order since it has the Do=outside coil diameter and the Di=inside coil diameter in the proportions Do:Di=Phi^3 and as such it has the pattern of 36x36 according to Tom Barnett's suggestion. Just as a reminder, Phi is the a constant called the Golden Ratio which is Phi=1.618. See how calculations are done for the different order coils in the image above or in the PDF provided in the 'Things Files' section.
I updated the PDF document and now has some sample calculations to show how to design different dimension and order Phi proportion Rodin coils.
The various patterns come from and can be found here https://youtu.be/7pvuTZ5u6Kg which is the YouTube channel of Randy Powell, the discoverer of this modeling.
You can scale this design, of course, but I would not go smaller than Do=200mm or 8", otherwise the ribs/formers get too thin and flimsy.
See images how the winding is going around the coil. The images show one loop only so you can see the path clearly. The colour markings help to see that every 2nd grove has the wire bundle routed through it, on the adjacent former.
This design has 16 ribs or former to try to get as close to the correct wire path as possible. This also makes it simpler as the former are symmetrical all around the ring. Make sure that the tabs on the former are all facing the same way as the slot is not in the center, due to the cable routing, see video here => https://youtu.be/ohHqAKv_6No
I provided the files for a smaller Do=250mm too which is reflected in the file names. Just in case you do not want to build the larger one.
The green coil frame which is built on the photos is the 250mm diameter one. It can take about 1kg of wire. This one has a bifilar 0.63mm diameter winding wire and they create 2 coils with 8.5 Ohm resistance each. The bifilar winding wire is just goes around as long as it runs out so it only has 2 x 2 connections. It took a few hours to wind it on the coil as it went around it about 6 times.
I included the 36:36 pattern image which will allow you to build and experiment with different map configurations and sizes while modelling the different order coil vortexes. It can be the bases of other patterns with duplication and overlaying.
Just click on the X to enlarge the image and then a link will appear 'View Original'. Click on it and when the image appears right click on it and save the image to your computer.
3D Printing:
I print straight to the print bed without any foundation or support. For this you need to make sure that your printer sensor is calibrated correctly. I use 5 point print bed calibration. These parts fit on a 200mm x 200mm print bed.