Patent ID: 8110955

Claim:
A device for magnetic bearing of a rotor shaft with respect to a stator, the rotor shaft rotating about a rotation axis, the device comprising: a first bearing part connected to the rotor shaft, the first bearing part containing soft-magnetic rotor disk elements aligned at right angles to the rotation axis, the rotor disk elements being arranged one behind the other in a direction of the rotation axis, the rotor disk elements being separated with respective intermediate spaces therebetween; and a second bearing part associated with the stator, the second bearing part substantially surrounding the first bearing part with a distance between the first and second bearing parts, the second bearing part containing soft-magnetic stator disk elements aligned at right angles to the rotation axis, the stator disk elements being arranged one behind the other in the direction of the rotation axis, each stator disk element projecting into one of the intermediate spaces between adjacent rotor disk elements such that the rotor disk elements and the stator disk elements have mutually facing sides separated from one another, wherein the rotor disk elements and the stator disk elements are provided on their respectively mutually facing sides with annular tooth-shaped projections having an axial width, the tooth-shaped projections on the stator disk element opposing the tooth-shaped projections on the adjacent rotor disk elements with an air gap therebetween, the mutually facing sides of the rotor disk elements and the stator disk elements, that are provided with the tooth-shaped projections, are inclined at an angle to a direction perpendicular to the rotation axis, a magnetic-field-generator is associated with the rotor disk elements or the stator disk elements to direct a magnetic flux between the disk elements in the direction of the rotation axis, and the air gap between opposing tooth-shaped projections has an axial width, the axial width being between 0.2-times and 0.6-times the axial width of the tooth-shaped projections.