EP 1313951 A1 20030528 - VACUUM PUMP
Title (en)
VACUUM PUMP
Title (de)
VAKUUMPUMPE
Title (fr)
POMPE A VIDE
Publication
Application
Priority
- DE 10043235 A 20000902
- EP 0109252 W 20010810
Abstract (en)
[origin: WO0218794A1] The vacuum pump (10) comprises a stator (14) in which a rotor (12) with radial magnetic bearings (16,19) and with an axial magnetic bearing (40) is mounted in a contactless manner. The axial magnetic bearing (40) produces an axial magnetic field by means of a magnet coil (40) with a yoke iron (44) on the stator (14).An axially magnetized permanent magnet (50) is provided on the rotor (12), located approximately axially opposite the yoke iron (44). A permanently axially magnetized compensating magnet (54) is provided on the stator (14) and arranged axially opposite the permanent magnet of the rotor (50) and polarized in the opposite direction, whereby the permanent magnet (50) of the rotor and the compensating magnet (54) repel each other. In a centre 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 centre 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.
IPC 1-7
IPC 8 full level
F04D 29/056 (2006.01); F04D 19/04 (2006.01); F04D 29/04 (2006.01); F04D 29/048 (2006.01); F04D 29/058 (2006.01); F16C 39/06 (2006.01)
CPC (source: EP US)
F04D 19/048 (2013.01 - EP US); F04D 29/051 (2013.01 - EP); F04D 29/058 (2013.01 - EP US); F16C 32/047 (2013.01 - EP US); F16C 32/0478 (2013.01 - EP US); F16C 2360/45 (2013.01 - EP US)
Citation (search report)
See references of WO 0218794A1
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
WO 0218794 A1 20020307; DE 10043235 A1 20020314; EP 1313951 A1 20030528; JP 2004513277 A 20040430; US 2003180162 A1 20030925; US 6877963 B2 20050412
DOCDB simple family (application)
EP 0109252 W 20010810; DE 10043235 A 20000902; EP 01965186 A 20010810; JP 2002522686 A 20010810; US 36347303 A 20030228