Forschungszentrum Julich Gmbh

Borgwarner Inc.

John K Fremerey

Jens-Wolf Jaisle

Matthias Lang

The invention concerns an exhaust gas turbocharger () having a shaft () on which a turbine wheel () and a compressor wheel () sit and which is guided in radial bearings () and in at least one axial bearing (), which is characterized in that the radial bearings () are embodied as passive magnetic bearings having permanent magnets (through) generating axial magnetic fluxes; and the axial bearing () is embodied as an active magnetic bearing having an electromagnet (), an axial sensor, and a controller for controlling the electrical current impinging upon the electromagnet ().

Exhaust gas turbocharger

A magnetic bearing arrangement () for a motion element, having the following features: the magnetic bearing arrangement has a stator. The magnetic bearing arrangement has a passive magnetic bearing () for lateral guidance of the motion element () and a controllable magnetic bearing () for guidance of the motion element perpendicular to the guidance by way of the passive magnetic bearing. The controllable magnetic bearing has an electronic stabilization device; the stabilization device has an electrical conductor () that can have an electrical control current applied to it by the stabilization device and that is associated with the stator element () in such a way that the magnetization of the stator element is influenced by the control current. The controllable magnetic bearing has a permanent magnet (); the permanent magnet is arranged on the motion element opposite the stator element. The magnetic force between permanent magnet and stator element is dimensioned such that with a control current of zero, the motion element is held in the working position; and only upon deviation from that working position is a control current generated that influences the magnetization of the stator element in the direction of re-establishing the working position.

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Bonn, Germany

John K Fremerey