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US 2003/0170132 A1Published application
Machine, preferably a vacuum pump, with magnetic bearings
OwnerHeinrich Englander, Josef Hodappinventors
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OwnerHeinrich Englander, Josef Hodappinventors
Estimating the term…
The invention relates to a machine (1), comprising a stator and a rotor (2) which is mounted with radially stable and axially unstable magnetic bearings (3, 4). Said magnetic bearings (3, 4) each consist of concentrically arranged magnetic ring sets (5, 6; 7, 8) in which the stationary magnetic ring set (5 or 7) is situated inside and the rotating magnetic ring set (6 or 8) is situated outside. The machine also comprises means (21, 23, 24, 27) for regulating the axial position of the rotor (2). The aim of the invention is to simplify a machine of this type. To this end, one (4) of the two magnetic bearings (3, 4) is itself equipped with the axial regulation means and at least one coil (23) controlled by a position sensor (21) and pole components (24) surround the outer magnetic ring set (8) of the axially regulated bearing (4).
Machine (1), comprising a stator and a rotor (2) which is mounted with radially stable and axially unstable magnetic bearings (3, 4), whereby the magnetic bearings (3, 4) each consist of concentrically arranged magnetic ring sets (5, 6;
Machine in accordance with claim 4 or 5, wherein one or several coil(s) (23) with one, resp. one each U-shaped pole component (24) is/are provided.
Machine in accordance with one of the above claims, wherein the number of the magnetic rings of the two ring sets of a magnetic bearing differ.
Machine in accordance with one of the above claims, wherein the magnetic rings of the ring sets (5, 6, 7, 8) are affixed in receptacles, where as the receptacle for the magnetic rings of the outer ring set (8) of the axially active bearing (4) a pipe-shaped reinforcement is employed which is affixed to a first section at the rotating system (2) and with a second section that carries the magnetic rings of the ring set (8).
Machine in accordance with one of the above claims, wherein the diameters of the facing circumferential surfaces of the rings of a pair of ring sets (5, 6 resp. 7, 8) change in steps.
Machine in accordance with one of the above claims, wherein at least between a part of the magnetic rings of the magnetic ring sets (5, 6, 7, 8) there are located spacing ring disks (31) made of a non-ferrite material.
Machine in accordance with one of the above claims, wherein it is designed as a drag pump (1) and where the passive bearing (3) is located at the high-vacuum side, the axially active bearing (4) at the fore-vacuum side.
Dependencies are inferred from the claim text.