Abstract: The present invention relates to a rotor arrangement for a turbomachine, having a rotor with a first rotor stage, a shaft, and a first hub for joining the first rotor stage to the shaft. The first hub has a balancing device for balancing the first rotor stage. In addition, the present invention relates to a compressor.

Abstract: The present invention relates to a rotor arrangement (100) for a turbomachine, having a rotor with a first rotor stage (1), a shaft (3), and a first hub (5) for joining the first rotor stage (1) to the shaft (3). The first hub (5) has a balancing device (30) for balancing the first rotor stage (1). In addition, the present invention relates to a compressor.

Abstract: A rotor drum (100) for a turbomachine, the rotor drum (100) including portions of at least a first rotor main body (3) and a second rotor main body (5), and the second rotor main body (5) having at least one rotor arm (7) is provided. The rotor drum (100) has at least one opening (1) as a passage opening for allowing fluids to pass therethrough from an inner rotor space (22) to an outer rotor space (23), the opening (1) being disposed radially outwardly at the greatest radius (19) of an inner contour (21) of the rotor drum (100). A compressor is also provided.