Is it possible to create a passive magnetic bearing by layering the outside of a shaft with a magnetic film and placing a magnetic ring on the outside. The outer layer of the film would have a north pole while the inner layer of the ring would also have a north pole (schematic below). I understand the ring would fall down due to its weight, but in the radial direction, would the system be stable?

Theoretically, it seems plausible, but I wasn't able to find any papers detailing the associated equation for force.

Magnetic Ring around a Shaft Covered in Magnetic Film

Thank you.

  • $\begingroup$ Consider the interactions between the N and where their S would have to be. Draw lines from N to S, away from N. Because of how unstable it ends up (like balancing a ball on a ball), there is a need for something else to handle any slight changes in load. Closest visually would be something that uses the undesired motion to generate a magnetic field to induce a load toward the desired stable state, usually via sapping something's velocity - just a mechanical version of an active version that might use sensors and a battery. $\endgroup$
    – Abel
    Mar 1 at 1:51


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