PASSIVE RADIAL MAGNETIC BEARING WITH CONCENTRIC PERMANENT MAGNETS REPELLING EACHOTHER IN COMBINATION WITH THRUST BALL BEARINGS

摘要

A passive magnetic bearing which has an exceptionally low friction couple. Radial and axial restraint is achieved through magnetic and mechanical means. The embodiment of the passive magnetic bearing has two axially magnetized rings, which each exhibit at least one pair of north and south poles. The magnetized rings are positioned in a manner where the poles are in a repulsive magnetic interaction such that the plane of symmetry which separates the like poles lies perpendicular to the axis of the rotation of a shaft and this radially constrains the movement of the shaft. Axial rigidity is added to the system by the use of ceramic bearings and related axial retaining mechanisms on one of the ring magnets thus maintaining the magnetic bearing in an otherwise unstable axial plane.