The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2005
Filed:
Aug. 10, 2001
Christian Beyer, Köln, DE;
Heinrich Engländer, Linnich, DE;
Josef Hodapp, Köln-Sülz, DE;
Leybold Vakuum GmbH, Cologne, DE;
Abstract
A rotor () is mounted in a stator () with radial magnetic bearings () and with an axial magnetic bearing () in a contactless manner. The axial magnetic bearing () produces an axial magnetic field with a magnet coil () and a yoke iron () mounted on the stator (). An axially magnetized permanent magnet () is provided on the rotor (), located approxaimately axially opposite the yoke iron (). A permanently axially magnetized compensating magnet () is provided on the stator () and arranged axially opposite the permanent magnet of the rotor () and polarized in the opposite direction, such that the permanent magnet () of the rotor and the compensating magnet () repel each other. In a center position, the rotor is bias-free by compensating the forces of attraction between the permanent magnet of the rotor and the yoke iron. As a result, the center position of the rotor can be adjusted with relatively small magnet coil flows. This results in small magnet coils, produces less heat and reduces the required power of the axial bearing.