Magnetic bearing and method for operating a magnetic bearing

A method for operating a magnetic bearing having a first bearing ring and a second bearing ring arranged concentrically in relation to the first bearing ring, wherein the first bearing ring and the second bearing ring are mounted so as to be rotatable with respect to each other about an axis of rotation by means of electromagnets, wherein the first bearing ring has a first magnet row and a second magnet row, wherein the magnet rows each comprise electromagnets arranged at a distance from one another in a circumferential direction of the first bearing ring, wherein the electromagnets of the magnet rows are oriented to exert a magnetic force on the second bearing ring, which magnetic force is oriented transversely to the axis of rotation and transversely to a radial plane which is arranged perpendicularly to the axis of rotation, wherein the second bearing ring comprises an annular flux separator of a non-magnetic material that is configured to function as a back-up bearing, the method comprising rotating one of the first bearing ring and the second bearing ring relative to the other of the first bearing ring and the second bearing ring.