# US 11,994,059 B2 · Electric exhaust turbocharger

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- Number: US 11,994,059 B2
- Document ID: US11994059B2
- Status: Granted
- Kind: B2
- Application number: 18/203,087
- Filed: 2023-05-30
- Published: 2024-01-25
- Granted: 2024-05-28
- Earliest claimed: 2023-05-30
- Assignees: Dr. Ing. h. c. F. Porsche AG
- Applicants: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
- Inventors: Werner Verdoorn
- Web page: https://patentgrep.com/patent/US11994059B2

## CPC

- F01D 25/164: {Flexible supports; Vibration damping means associated with the bearing}
- F02B 39/10: electric
- F02B 33/40: of non-positive-displacement type
- H02K 5/1732: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence)}
- H02K 7/083: {radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence)}
- H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06)
- F05D 2220/40: in turbochargers
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

An electric exhaust turbocharger (10) has 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) is fixed to a rotor shaft (52) and is connected non-rotatably to the turbine wheel (12) and the compressor wheel (14) via the rotor shaft (52). The rotor (54) is arranged axially between the turbine wheel (12) and the compressor wheel (14) on the rotor shaft (52). Roller bearings (60, 60′) are arranged between the rotor (54) and the turbine wheel (12) on the one hand and between the rotor (54) and the compressor wheel (14) on the other hand. A single separate shaft bearing cassette (40) with a cassette frame (71) supports the two roller bearings (60, 60′).

## Claims

### Claim 1

An electric 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), a first roller bearings (60) being arranged between the rotor (54) and the turbine wheel (12), and a 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) comprises first and second bearing segments (70, 74) respectively supporting the first and second roller bearings (60, 60′), and a motor segment (72) having a grid structure extending between the first and second bearing segments (70, 74).

### Claim 2 (depends on 1)

The electric exhaust turbocharger (10) of claim 1, wherein the motor segment (72) of the cassette frame (71) comprises substantially axially oriented grid bars (46) connecting the first and second bearing segments (70, 74).

### Claim 3 (depends on 2)

The electric exhaust turbocharger (10) of claim 2, wherein the engine stator (30) comprises: a stator body (34), coils (32) supported by the stator body (34) and pole shoes (34′) arranged in spaces between the grid bars (46), the pole shoes (34′) forming electromagnetic stator poles of the stator (30).

### Claim 4 (depends on 1)

The electric exhaust turbocharger (10) of claim 1, wherein the cassette frame (71) is non-ferromagnetic.

### Claim 5 (depends on 1)

The electric exhaust turbocharger (10) of claim 1, further comprising a separate charger housing (20) supporting the stator (30) and the shaft mounting cassette (40).

### Claim 6 (depends on 1)

The electric exhaust turbocharger (10) of claim 1, wherein the rotor (54) is permanently magnetically formed.

### Claim 7

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).

### Claim 8

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).