Characteristics of ring permanent magnet bearing

Permanent magnet bearings are useful for elements of super flywheels and super high vacuum pumps because of their simple construction and no losses. This paper describes a calculation method for forces between pairs of ring permanent magnets with small displacements from a center line of equilibrium. Test data on stiffness, thrust force and damping constant were used to verify the calculation. From this method, we developed a lower thrust force, or even repulsive type, permanent magnet bearing.