# US 11,898,566 B2 · Motor-driven compressor having a compression section mounted on a free end of a cantilvered shaft > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,566 B2 - Document ID: US11898566B2 - Status: Granted - Kind: B2 - Application number: 17/320,914 - Filed: 2021-05-14 - Published: 2022-03-10 - Granted: 2024-02-13 - Earliest claimed: 2018-11-21 - Assignees: Nuovo Pignone Technolgie SRL - Applicants: Thermodyn SAS - Inventors: Yoann Vidalenc; Benjamin Defoy; Thomas Alban - Web page: https://patentgrep.com/patent/US11898566B2 ## CPC - F04D 17/12: Multi-stage pumps - F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence) - F04D 17/10: for compressing or evacuating - F04D 29/054: Arrangements for joining or assembling shafts - F04D 29/056: Bearings - F04D 29/058: magnetic; electromagnetic - F04D 25/02: Units comprising pumps and their driving means - F04D 25/0606: {the electric motor being specially adapted for integration in the pump} - F04D 25/16: Combinations of two or more pumps {; Producing two or more separate gas flows} - F04D 29/051: Axial thrust balancing - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract A motor-driven compressor equipped with multiple compression sections, the motor-driven compressor including, at least one housing, at least two drive shafts, the at least two drive shafts being rotatably supported in the housing by at least two bearings, a flexible coupling device connecting the drive shafts, an electric motor mounted on a first compression shaft of the at least two drive shafts, and at least two compression sections. A first compression section of the at least two compression sections is cantilevered at a free end of a first compression shaft of the at least two drive shafts, and a second compression section is mounted between two bearings on a second compression shaft of the at least two drive shafts. ## Claims ### Claim 1 A motor-driven compressor with multiple compression sections, the motor-driven compressor comprising: a housing; a first compression drive shaft and a second compression drive shaft, both being rotatably supported in the housing by bearings comprising a first pair of bearings on the first compression shaft and a second pair of bearings on the second compression drive shaft; a flexible coupling device connecting the first compression drive shaft and the second compression drive shaft; an electric motor mounted on the first compression shaft between the first pair of bearings; at least two compression sections comprising a first compression section that is cantilevered at a free end of the first compression shaft, and a second compression section that is mounted between the second pair of bearings on the second compression shaft; a first thrust abutment mounted on the first compression shaft between one of the first pair of bearings and the flexible coupling device; and a second thrust abutment mounted on the second compression shaft between one of the second pair of bearings and the second compression section. ### Claim 2 (depends on 1) The motor-driven compressor according to claim 1, further comprising: a third compression section mounted on the second compression shaft; and a bearing separating the third compression section from the second compression section. ### Claim 3 (depends on 1) The motor-driven compressor according to claim 1, further comprising: a third compression shaft rotatably supported in the housing by a third pair of bearings; a second flexible coupling device connecting the third compression shaft to the second compression shaft; and a third compression section mounted on the third compression shaft between the third pair bearings. ### Claim 4 (depends on 1) The motor-driven compressor according to claim 1, wherein the first compression section and the second compression section each comprises a compression wheel. ### Claim 5 (depends on 1) The motor-driven compressor according to claim 1, wherein the first compression section comprises two compression wheels. ### Claim 6 (depends on 1) The motor-driven compressor according to claim 1, wherein the first compression section and the second compression section each comprises: an inlet flange; and an outlet flange, wherein the inlet flange and the outlet flange are arranged perpendicular to the first drive shaft and the second drive shaft. ### Claim 7 (depends on 1) The motor-driven compressor according to claim 1, wherein the second compression section comprises two compression half-sections so that, during the rotation of the drive shaft, the thrust generated by a half-section compensates for the thrust generated by the other half-section. ### Claim 8 (depends on 7) The motor-driven compressor according to claim 7, wherein each compression half-section comprises: an inlet flange; and an outlet flange, wherein the inlet flange and the outlet flange are arranged perpendicular to the first drive shaft and the second drive shaft. ### Claim 9 (depends on 1) The motor-driven compressor according to claim 1, wherein the first pair of bearings comprise active magnetic bearings. ### Claim 10 (depends on 1) The motor-driven compressor according to claim 1, wherein the second pair of bearings comprise active magnetic bearings. ### Claim 11 (depends on 1) The motor-driven compressor according to claim 1, wherein the first pair of bearings and the second pair of bearings comprise active magnetic bearings. ### Claim 12 (depends on 1) The motor-driven compressor according to claim 1, wherein the first compression section is configured to receive gas at atmospheric pressure. ### Claim 13 (depends on 1) The motor-driven compressor according to claim 1, wherein the second compression section is configured to receive gas at atmospheric pressure. ### Claim 14 (depends on 1) A system comprising the motor-driven compressor according to claim 1 and a gas cooler attached to the first compression section. ### Claim 15 (depends on 14) The system of claim 14, further comprising a gas cooler attached to the second compression section.