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US 12,338,823 B2Granted
Electric motor and vacuum pump
AssigneeVacuubrand GmbH + Co KG
InventorsTobias Müller, Christian Fehn, Frank Gitmans
Life of this patent
Estimating the term…
Abstract
An electric motor, in particular for a vacuum pump, with two magnetically coupled shafts. A correction force can be set on each shaft by means of adjusting magnet devices, whereby negative effects due to errors in the magnetic coupling can be compensated.
Claims16
An electric motor, comprising:
- two rotor magnet devices respectively arranged on parallel shafts, the rotor magnet devices being arranged in a common stator in the operating state of the electric motor in such a way that they interact with one another for a mutual coupling with regard to their rotational angular position,
- wherein at least one adjusting magnet device is arranged on each of the two shafts, at least one of the adjusting magnet devices being adjustable by means of rotation relative to the associated shaft and/or being variable in the rotational angular position relative to a complementary adjusting magnet device of the respective other shaft for compensating a force acting between the rotor magnet devices of parallel shafts during operation of the electric motor by adding a correction force that is phase-shifted against a coupling force between the rotor magnet devices with respect to the rotational angular position.
A vacuum pump, comprising at least one electric motor for rotating at least two displacement elements,
- wherein the electric motor has two rotor magnet devices respectively arranged on parallel shafts, the rotor magnet devices being arranged in a common stator in the operating state of the electric motor in such a way that they interact with one another for mutual coupling with regard to their rotational angular position,
- wherein at least one adjusting magnet device is arranged on each of the two shafts, at least one of the adjusting magnet devices being adjustable by means of rotation relative to the associated shaft and/or being variable in the rotational angular position relative to a complementary adjusting magnet device of the respective other shaft for compensating a force acting between the rotor magnet devices of parallel shafts during operation of the electric motor by adding a correction force that is phase-shifted against a coupling force between the rotor magnet devices with respect to the rotational angular position.
Dependencies are inferred from the claim text.