Patent ID: 8058758

Claim:
An apparatus for a magnetic bearing of a rotor shaft having an axis and a stator, comprising: a first bearing part, connected to the rotor shaft, containing soft-magnetic rotor disk elements aligned at right angles to the axis of the rotor shaft, arranged one behind another in a direction of the rotor shaft axis and each separated to form an intermediate space; a second bearing part, associated with the stator, surrounding said first bearing part with a distance between said second bearing part and said first bearing part, said second bearing part containing soft-magnetic stator disk elements aligned at right angles to the axis of the rotor shaft, arranged one behind another in the direction of the axis of the rotor shaft, separated from one another and each projecting into one of the intermediate spaces between adjacent rotor disk elements, said first and second bearing parts each subdivided into two bearing halves symmetrically with respect to a center plane at right angles to the axis of the rotor shaft, the rotor disk elements and the stator disk elements having on respectively mutually facing flat sides, annular tooth-like projections which are each opposite one another separated by an air gap; magnetic-field-generating means, associated with the stator disk elements, for generating a magnetic holding flux directed essentially in an axial direction across the air gaps, thereby providing radial guidance of the rotor shaft; and at least one fixed-position winding of an electromagnet providing axial control in an area of the center plane and producing during operation a magnetic control flux superimposed on the magnetic holding flux such that the flux densities of the control flux and of the holding flux are additively superimposed on one side of the rotor disk elements and are subtractively superimposed on the respectively opposite side, wherein all of the rotor disk elements and the stator disk elements have trapezoidal cross-sectional shapes.