FDM - flux displacer motor by Igor Knitel (Perihelion Labs)

[broli]

Let me show you the most basic and recent design I ended up with after going through countless designs for these "zero air gap continuous core" lafonte based ideas.

The only parts that rotate are the two C magnets on top. As the C magnets rotate around they change the field inside of the stationary C coils, however irregardless of how they are energized the coils will not affect the rotation of the magnets in anyway ie a torqueless generator. No expensive custom laser cut laminates needed common rolled silicon steel cores will do.

The simulation shows how the nearest C core is preferred over the other magnet on the other side as to dump most of its field through it. This is an important aspect of the design, if the field were to go around then the coils will induce little to no voltage.

[DreamThinkBuild]

Hi Broli,

Great idea, that will work. I have tested it before but replace the C cores with magnets on washers and let it roll directly on the plate. No space required and allows the full flux to go to the C core. I tried this over a C core and it generates a nice sharp pulse when it rides over it. It may be better to use non-ferromagnetic spacers so the full flux goes through each C core individually

[broli]

It's a clever idea but you might be over complicating things. I did do some high element 2D FEMM simulations just to investigate that specific aspect of things and discovered the air gap doesn't have to be THAT small.

For instance below you see such a FEMM simulation where there's two magnets, the outer core is to circumvent the 2d limitation of FEMM. When you analyze the forces on these magnets you find that the upper magnet experiences a sideway force of -29 mN and the bottom one a force of 22mN. So even though the airgap is much bigger the side way force is equally or even less strong than the one with a very tiny airgap.

[wizkycho]

Guys ! You are just tripi'n beserk !!!
goto page 1 (of this thread)
wiz

[broli]

Hey you wanted me to be constructive didn't you. For reasons beyond me you are ignoring the fact that your motor concept will not generate a torque. Irregardless of how you position the inner rotor the fields will just disperse and bend in order to reach the outer magnets, there's no reason for it to "follow" the inner magnets. because of the uniform surface.

However you may alter your stator core slightly by breaking the uniformity on the outside, see below.  Also get rid of the ring magnet, it serves no purpose.

Edit: When I get home I'll post a better rendition.