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Patent Searching and Data


Title:
MAGNETIC BEARING AND VACUUM PUMP WITH SUCH A MAGNETIC BEARING
Document Type and Number:
WIPO Patent Application WO/2019/138213
Kind Code:
A1
Abstract:
Vacuum pump, in particular a turbo molecular vacuum pump comprising a stator and a rotor wherein the rotor is rotated by a motor and comprises rotor elements in order to convey a gaseous medium from an inlet to an outlet, wherein the rotor is supported by at least two bearings wherein at least one bearing is a magnetic bearing. The magnetic bearing comprises a non-rotating first magnetic element and a second magnetic element rotating relative to the first magnetic element. Thereby, the first magnetic element and the second magnetic element are in mutual repulsion to each other to maintain a contact-less bearing. Thereby, the first magnetic element and/or the second magnetic element comprise a permanent magnet made of a magnetic material, wherein the magnetic material has a relative magnetic permeability μr(Τ1) at a first temperature T1 and a relative magnetic permeability μr(Τ2) at a second temperature T2 which fulfill μr(Τ1) <μr(Τ2) with T1 < T2.

Inventors:
KHOR, Eng Keen (Edwards Limited, Innovation Drive, Burgess Hill Sussex RH15 9TW, RH15 9TW, GB)
Application Number:
GB2019/050036
Publication Date:
July 18, 2019
Filing Date:
January 08, 2019
Export Citation:
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Assignee:
EDWARDS LIMITED (Innovation Drive, Burgess Hill Sussex RH15 9TW, RH15 9TW, GB)
International Classes:
F04D19/04; F04D29/058
Foreign References:
US6498410B12002-12-24
US20150132109A12015-05-14
US6727616B12004-04-27
Attorney, Agent or Firm:
NORTON, Ian (Edwards Limited, Innovation Drive, Burgess Hill Sussex RH15 9TW, RH15 9TW, GB)
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