Abstract: A turbomachine for use as a compressor has a tubular housing centered on an axis, a rotor at least generally centered on the axis in the housing, and bearings supporting the rotor in the housing for rotation about the axis. The rotor is formed by a small-diameter shaft extending along and centered on the axis, formed with at least one mounting collar, and carried by the bearings, and by a plurality of annular disks fitted axially together and formed with radially outwardly extending vanes. At least one of the disks is fitted with and secured to the mounting collar.

Abstract: A turbomachine has a rotor shaft, which is mounted in a bearing arrangement containing a hydrodynamic axial bearing, and a rotor disposed on the rotor shaft. A hydrostatic axial bearing is additionally provided in the immediate vicinity of the hydrodynamic axial bearing, the hydrostatic axial bearing absorbing the axial force acting on the rotor shaft at rest, completely or at least for the most part, relieving stress on the hydrodynamic axial bearing during start-up processes of the rotor shaft, and being shut off during operation at the rated speed of rotation.

Abstract: A turbomachine has a rotor shaft, which is mounted in a bearing arrangement containing a hydrodynamic axial bearing, and a rotor disposed on the rotor shaft. A hydrostatic axial bearing is additionally provided in the immediate vicinity of the hydrodynamic axial bearing, the hydrostatic axial bearing absorbing the axial force acting on the rotor shaft at rest, completely or at least for the most part, relieving stress on the hydrodynamic axial bearing during start-up processes of the rotor shaft, and being shut off during operation at the rated speed of rotation.