US 5,729,065 AGranted

Magnetic bearing cell with rotor and stator

AssigneeLeybold Aktiengesellschaft

InventorsJohan K. Fremery, Helmut Schneider, Peter Reimer, Josef Hodapp

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Abstract

The invention relates to a rotationally symmetrical.sup.1 magnetic bearing cell (1) with a rotor (2) arranged to rotate about the central axis (10) of the cell (1) and having a shaft (4) and at least two axially magnetised permanent magnetic rings (5, 6, 30) fitted an axial distance apart on the shaft and with a stator (3) having pole components (12, 13, 16, 17) and two annular coils (14, 15) associated with the rotor end faces; to improve the radial rigidity without increasing active control complexity, it is proposed that pole components (26, 27, 38) of magnetically conductive material be provided for the peripheral regions of the two axially outer permanent magnet rings (5, 6 or 5, 30) to direct the magnetic flux generated by the annular coils (14, 15) into two substantially independent magnetic flux circuits (28, 29).

Claims3

Dependent claims

A rotationally symmetrical magnetic bearing cell (1) comprising:

a rotor (2) arranged to rotate about a central axis (10) of the cell (1) and having a shaft (4) and at least two axially magnetised permanent magnetic rings (5, 6, 30) fitted an axial distance apart on the shaft, as well as
a stator (3), which has a first plurality of pole components (12, 13, 16, 17) and two annular coils (14, 15) which are associated with a respective rotor end face,
whereby the rotor and stator are arranged with respect to each other in such a manner that the permanent magnetic rings (5, 6, 30) produce a magnetic flux (11) which toroidally surrounds the central axis (10) and embraces the annular coils (14, 15)
wherein
a second plurality of pole components (26, 27, 38) made of a magnetically well conducting material are associated with respective peripheral regions of each of the two axially outer permanent magnetic rings (5, 6 or 5, 30), whereby said second plurality of pole components direct a magnetic flux generated by the annular coils (14, 15) into two substantially independent magnetic flux circuits (28, 29).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/491,987Filed 13 Sep 1995
Priority: DE 43 01 076.816 Jan 1993
Granted: 17 Mar 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F16C 32/0465
Of stationary parts of the magnetic circuit: with permanent magnets provided in the magnetic circuit of the electromagnets
F16C 32/0414
For radial load mainly: with facing axial projections
F16C 32/0476
For rotary movement: with active support of one degree of freedom, e.g. axial magnetic bearings
F16C 2300/02
Application independent of particular apparatuses: general use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a…