Magnetic bearing and vacuum pump with such a magnetic bearing

摘要

A magnetic bearing for supporting a rotating element, comprising: a non-rotating first magnetic element and a second magnetic element rotating relative to the first magnetic element: wherein the first magnetic element and the second magnetic element are in mutual repulsion to maintain a non-contact bearing, the first magnetic element and / or the second magnetic element has a permanent magnet made of a magnetic material, the magnetic material having a relative magnetic permeability µr (T1) at a temperature T1 and a relative magnetic permeability µr (T2) at a second temperature T2, which is µr (T1) µr (T2) fulfilled at T1 T2 in order to compensate for the increase in the exerted axial force due to the temperature increase from T1 to T2.