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A pump, particularly a turbo vacuum pump, comprises a housing having an intake and an exhaust spaced from the intake. The respective ends of the housing are provided with bearing bushes which extend in respective opposite directions and support a pump rotor in a manner to permit it to have some axia

A pump, particularly a turbo vacuum pump, comprises a housing having an intake and an exhaust spaced from the intake. The respective ends of the housing are provided with bearing bushes which extend in respective opposite directions and support a pump rotor in a manner to permit it to have some axial and radial play. A first magnetic system acts on the rotor and stabilizes the rotor axially in respect to the bearings and a second magnetic system acts on the rotor and stabilizes the rotor radially in respect to the bearings. The second magnetic system includes at least one permanent magnet which is fixed to the casing and faces either soft iron or permanent magnet portions provided on the rotor. An electromotor is mounted within the casing and the coil of the electrodynamic system and the stator of the drive motor are assembled to a subassembly which can be mounted or dismounted from the pump casing in a simple manner without interfering with the rotor or the stator. The magnetic centering system includes a permanent magnet which produces a magnetic field of an electrodynamic system which is secured to the inner surface of a pot-shape yoke having a central core pin. The motor is of known construction but without a commutator and it is equipped with permanent magnets and designed as an outside rotor which is mechanically connected to the pot-shape yoke and which carries permanent magnets on its inside.

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A turbo vacuum pump, comprising a cylindrical casing having an intake adjacent one end and an exhaust adjacent an opposite end of said casing, a stator mounted in said cylindrical casing, a rotor arranged within said casing, first rotor mounting means for the radial mounting of said rotor, second ro

A turbo vacuum pump, comprising a cylindrical casing having an intake adjacent one end and an exhaust adjacent an opposite end of said casing, a stator mounted in said cylindrical casing, a rotor arranged within said casing, first rotor mounting means for the radial mounting of said rotor, second rotor mounting means for the axial mounting of said rotor, said second rotor mounting means for the axial mounting comprising an electrodynamic system disposed adjacent said exhaust and including a permanent magnet arrangement which is secured to said rotor and which produces a substantially radial field, and a coil arranged concentrically in respect to said rotor and immersed in said permanent magnet arrangement, said first rotor mounting means comprising at least one permanent magnet arrangement which is fixed to the casing and said rotor has a magnetic portion axially aligned and oppositely facing said permanent magnetic arrangement.