This is something I looked at 3 or 4 years ago and then forgot about. I used a CAD-style program that does element analysis and adds up magnetic force vectors. If you look at some of the Perendev-motor”work” by others on the net, there is the issue of finding an arrangements of the magnets so that they don’t find a local minimum in the gradient field and get “stuck there”; the solutions usually involved using multiple “rotors” (3 typically) with a staggered configuration of the outer stator magnets. I thought “why not stagger the magnets on a single rotor/stator pair in such a way that a single pair will never find a local minimum in a full rotation?”. The software (Vizimag) can tell you the total force vector on each magnetic element in the diagram.
The idea is that the outer ring would be fixed on an annulus, called a stator, and the inner ring would be on another annulus but attached to a rotating axis, which could drive a generator.
Given that the outer ring would be fixed, I used Vizimag to determine the x & y force components on each of the inner magnets, did some simple trig and got the total tangential force on the rotor. Because the tangential force from each magnet acts along the tangent of the inner annulus to which they’re attached, you can then just add them all up together and see if there is a non-zero tangential force in one rotary direction. Using parameter values for real rare-Earth magnets, Vizimag said that the total net tangential force on the inner rotor was in the hundreds of foot (not inches) pounds of torque, for a 12″ rotor with 1″ x 3″ magnets of typical “rare-earth magnet” Gauss strength, which I just looked up the value for on the web from a retailer for these magnets. The stator magnets are 1″ x 2″.
1) The total number of magnets is 33. I figured things are hidden within the number 33.
2) 15 magnets on the inside, 18 on the outside. Spaced equally with #3 below setting the referent.
3) The first inner magnet, the horizontal one in the upper right quadrant, points at the outer rim of the inner annulus at 32 degrees.
4) Other designs I read about had directly-facing magnets on inner and outer annuli. While this would cause repulsion in one direction if they were all perfectly lined up, it also automatically creates a local minimum, or balance, of force between the magnets, when they were angled “in between” each other. So the inner axis would just rotate into the intermediary position and then STOP, forcefully. This required 2 or 3 more disks /annuli combo’s to be oriented at staggered positions relative to each other along a connecting drive axis so that when one disk wanted to stop rotating, the others would keep on pushing.
5) Why not stagger the magnets on a single disk, then? That’s what I tried. The result being that as the inner rotor rotates relative to the stator, while the total tangential force in the CCW direction does vary in magnitude, it does not ever reverse direction. If a few magnets start repulsing in the wrong direction, there are always more magnets of more total force pushing in the original direction.2
6) I emailed the guy who wrote the magnet force CAD software (Vizimag) and asked him if this set up actually would rotate. He said I was seeing rounding error. I don’t believe him. This mesh-grid for the element analysis is the finest the program will allow. I know how element analysis works. If his software has a rounding problem in the 100’s of pounds of force when each magnet’s force is only a few pounds, it wouldn’t work at all.
7) Therefore the best way to know is to do. I haven’t done but someone should, just for fun. Maybe it really wouldn’t work but hey, it is still fun garage tinkering. Some high-strength plastic could be machined to fit the magnets into. Etc etc, mechanical stuff.
8) The rotating magnets would cause huge EMF. It might be picked up by “authorities” as radio emission. Therefore, do the test inside a Faraday cage or out in the country far away from everything and then quickly and leave. The magnetic EMF might also have health issue concerns…so…might not want to get too near. It might also look like an EMP weapon…or, be an EMP weapon. It would create a ridiculously huge rotating vortex of magnetic energy flowing out along the axis when spinning at a few thousand RPM…
10) If it actually does rotate, how long do the magnets last? How permanent are permanent magnets? How much energy does it take to create/produce a synthetic permanent magnetic vs. how much energy do you get out of this design hooked up to a generator? For all the people wishing for a free energy machine…well…go ahead and try and let us know the results, hehe. You can use this design freely.
The next two images are GIFs and should animate – if they’re not animating then click on them or open them in a new tab…they might take a minute or two to download all the frames.
Anyway, just posting this here because I had it lying around on my desktop for the last few years. I honestly don’t know if it would work or not. The magnetic force analysis says it would, but hey, models are hardly anything to go by!