Transverse-displacement stabilizer for passive magnetic bearing systems

摘要

The invention provides a way re-center a rotor's central longitudinal rotational axis with a desired system longitudinal axis. A pair of planar semicircular permanent magnets are pieced together to form a circle. The flux from each magnet is pointed in in opposite directions that are both parallel with the rotational axis. A stationary shorted circular winding the plane of which is perpendicular to the system longitudinal axis and the center of curvature of the circular winding is positioned on the system longitudinal axis. Upon rotation of the rotor, when a transverse displacement of the rotational axis occurs relative to the system longitudinal axis, the winding will experience a time-varying magnetic flux such that an alternating current that is proportional to the displacement will flow in the winding. Such time-varying magnetic flux will provide a force that will bring the rotor back to its centered position about the desired axis.

主权项

1. An apparatus, comprising:
a system longitudinal axis; a cylindrical rotor having a central longitudinal rotational axis, said rotor including a first planar semicircular permanent magnet and a second planar semicircular permanent magnet, wherein first flux of said first planar semicircular permanent magnet is pointed in a direction parallel with said rotational axis and toward a first end of said rotor and wherein second flux of said second planar semicircular permanent magnet is pointed in a direction parallel with said rotational axis and toward a second end of said rotor; and a first stationary shorted circular winding the plane of which is perpendicular to said system longitudinal axis, wherein the center of curvature of said circular winding is positioned on said system longitudinal axis, wherein upon rotation of said rotor, when a transverse displacement of said central longitudinal rotational axis relative to said system longitudinal axis occurs, said winding will experience a time-varying magnetic flux such that a current that is proportional to said displacement will flow in said winding.