Magnetically suspended high velocity vacuum pump

Details Magnetically suspended high velocity vacuum pump Magnetically suspended high velocity vacuum pump

1998-01-26

2000-04-18

Thorpe, Timothy S.

Pumps

Diverse pumps

Series

417354, 4174234, 415 90, 415103, F04B 2308

Patent

active

060507829

ABSTRACT:
High velocity vacuum pump, such as turbomolecular pump, drag pump, centrifugal pump or the like, comprising a stator (10) and a rotor (18,43,53), which is axially and radially suspended with respect to the stator (10) by magnetic bearings (27). The vacuum pump may comprise two at the same rotor provided, parallelly acting pump portions, each one comprising two pumping steps. The rotor may be cylindrical and rotates around an inner stator shaft and within an outer stator portion. In that way, one pumping step (22) is formed between the inner stator shaft and the rotor and another pumping step (24) between the outer stator portion (10) and the rotor. The magnet bearing comprises at least one rotation symmetric magnet (27) and is disposed to give rise to a rotation symmetric magnetic field which is centered around the rotational axis. When and only when the rotor tends to leave the predetermined path, the magnetic field generates induced eddy currents in the rotor, which give rise to restoring stabilizing forces.

REFERENCES:
patent: 3399827 (1968-09-01), Schwartzman
patent: 3779618 (1973-12-01), Soglia et al.
patent: 3811740 (1974-05-01), Sacerdoti et al.
patent: 3969039 (1976-07-01), Shoulders
patent: 4295803 (1981-10-01), Barthelmess
patent: 5106273 (1992-04-01), Lemarquand et al.
patent: 5250865 (1993-10-01), Meeks
patent: 5470208 (1995-11-01), Kletschka
patent: 5501582 (1996-03-01), Gautier et al.
Magnetic Suspension and Propulsion Systems for High-Speed Transportation, P.L. Richards and M. Tinkham, J. Appl. Phys. vol. 43, No. 6, Jun. 1972, pp. 2680-2690.

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