09-20-2024, 09:04 PM
(09-19-2024, 06:27 PM)dd_alf Wrote: This is an impressive amount of work that speaks of dedication. I doubt anyone goes though all the details tho, it is a bit overwhelming. Well for me anyway. In regards to your questions asked, particularly this image: https://www.mooker.com/attachment.php?aid=1377
I would argue: the flux always takes the easiest path. Easiness is defined by length of path, material and saturation. In the example drawn I think the flux completely ignores the right part of the toroid, containing the gap. You could not even stick a nail to it. And regardless of the field created by a coil on the toroid core (saturation issues aside) this flux will just ADD to whatever the coil does. It will be a static bias, not affecting the coil in COP, I would assume.
That said, when I was looking at it, I though it would also be a really interesting design if the gap area were on the other side of the torus, right next to the PM. Then one would close the gap frequently with an iron bar that's spun by a small motor. It would force the PM flux to alternate its path, hence inducing AC into 2 coils, sitting on the top and bottom area of the toroid core. The point however is, I see no reason why this little iron bar, that's rotating in the gap, should face any Lenz drag. (except eddy currents, that can be prevented with nonconductive ferromagnetics, or laminates etc.). In any case the gap must be sized correctly, so the secondary fields of the coils (of opposite polarity) will will not make the long path harder, compared to the gap, resulting in the flux jumping the gap, despite the gap-less long path provided. However, I would use Metglas for the toroid, to increase permeability and subsequently the effect.
Hi dd_alf
I want to thank you for your input. It caused me to draw up a couple of new motor options that otherwise I may never have thought of.
The first drawing shows a thinner core area parrellel to the permanent magnet that will saturate if flux more than one magnet tries to flow through the area. The other area's of the toroid core suports the flux of two magnets. Hopefully then the DC power of the toroid coil is supplied, the permanent magnet will need to reroute through another path.
Also you mentioned moving the gap area. I moved it but am not using it as you suggested. I have seen designs simular to what you talked about, so I do not want to duplicate thier work.
Now I miss-read your post at first and I thought you were saying that in the Three Layer Motor design would not move from under the permanent magnets to the electro-magnets, so I changed the tab design for the permanent magnets and toroid coil area's. After re-reading your post, I realized I was wrong. But that may have been for the good,
Thank you dd-alf for your input because I may not have taken a closer look at my designs and make these improvements.
I will try to test the flux in the gap area when I get some lab time.
Lunkster