Patent ID: 7723884

Claim:
A permanent magnetic motor having a magnetic axial bearing and one or more fluid bearings ( 11 , 13 , 14 ), wherein a magnet ring ( 5 ) made up of permanent magnets is disposed to lie opposite a stator unit ( 4 ) and is separated from the stator unit by an air gap and the magnet ring ( 5 ) is fixed to the inside circumference of a circumferential hub ( 2 ) that is supported with respect to a bearing bush ( 3 ) by means of fluid bearings ( 11 , 13 , 14 ) via a shaft ( 1 ), and at least one fluid dynamic axial bearing ( 11 ) is preloaded with an axial attractive force component that is at least partly generated by a ferromagnetic pull ring ( 7 ) that is disposed below the magnet ring ( 5 ) and permeated by its field lines, characterized in that the pull ring ( 7 ) has no or only relatively low electrical conductivity at high magnetic permeability and a surface structure, ( 23 ) formed from impressions or moldings is disposed in the pull ring ( 7 ) in order to minimize electrical conductivity.