Electric exhaust turbocharger

An electric exhaust turbocharger (10) comprising:

• a turbine wheel (12), a compressor wheel (14) that is non-rotatably connected to the turbine wheel (12), and an electric drive motor having a stator (30) and a rotor (54), the rotor (54) being fixed to a rotor shaft (52), and being connected non-rotatably to the turbine wheel (12) and the compressor wheel (14) via the rotor shaft (52), the rotor (54) being arranged axially between the turbine wheel (12) and the compressor wheel (14) on the rotor shaft (52), first respective roller bearings (60) being arranged between the rotor (54) and the turbine wheel (12), and second roller bearings (60′) being arranged between the rotor (54) and the compressor wheel (14), and a single separate shaft bearing cassette (40) with a cassette frame (71) supporting the first and second roller bearings (60, 60′), wherein the cassette frame (71) is comprised of a one-piece main frame section (42) and a one-piece end frame segment (44), the one-piece main frame section (42) forming a first bearing segment (70) and a grid structure, and the one-piece end frame segment (44) forming a second bearing segment (74), the grid structure extending between the first and second bearing segments (70, 74).

An electric exhaust turbocharger (10) comprising:

• a turbine wheel (12), a compressor wheel (14) that is non-rotatably connected to the turbine wheel (12), and an electric drive motor having a stator (30) and a rotor (54), the rotor (54) being fixed to a rotor shaft (52), and being connected non-rotatably to the turbine wheel (12) and the compressor wheel (14) via the rotor shaft (52), the rotor (54) being arranged axially between the turbine wheel (12) and the compressor wheel (14) on the rotor shaft (52), first respective roller bearings (60) being arranged between the rotor (54) and the turbine wheel (12), and second roller bearings (60′) being arranged between the rotor (54) and the compressor wheel (14), and a single separate shaft bearing cassette (40) with a cassette frame (71) supporting the first and second roller bearings (60, 60′), wherein at least one of the first and second roller bearings (60, 60′) is formed directly on the rotor shaft (52) or directly on the cassette frame (71).