# US 2019/0170062 A1 · Device for compressing a fluid, driven by an electric machine with a rotor shaft having a non-magnetic shrink ring > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170062 A1 - Document ID: US20190170062A1 - Status: Published application - Kind: A1 - Application number: 16/209,333 - Filed: 2018-12-04 - Published: 2019-06-06 - Earliest claimed: 2017-12-04 - Assignees: Ifp Energies Nouvelles; Mavel S.R.L. - Applicants: IFP Energies nouvelles; MAVEL S.r.l. - Inventors: Misa MILOSAVLJEVIC; Thomas VALIN; Fabrice LE BERR; Stephane VENTURI; Benjamin GAUSSENS; Julien BOISSON; Abdenour ABDELLI; Luca FAVRE - Web page: https://patentgrep.com/patent/US20190170062A1 ## CPC - F02B 39/10: electric - F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure - F04D 25/024: {the driving means being assisted by a power recovery turbine} - F04D 25/0606: {the electric motor being specially adapted for integration in the pump} - F04D 29/266: {mounting compressor rotors on shafts} - H02K 1/2733: Annular magnets - F02B 37/10: at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump} - F05D 2220/40: in turbochargers - F05D 2220/76: an electrical generator - F05D 2260/37: by a press fit connection - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - 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) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - 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 The present invention relates to a compression device driven by an electric machine, for which the rotor (1) comprises a rotor shaft (31), a cylindrical magnet (34), and a non-magnetic shrink ring (33). According to the invention, the rotor shaft (31) includes a bore (36) for inserting one end of the compressor shaft (3). ## Claims ### Claim at position 1 -20. (canceled) ### Claim 21 A compression device of a fluid which is driven by an electric machine, the electric machine comprising a rotor including a rotor shaft and a stator, a compressor shaft on which is mounted at least one impeller wheel, the rotor being fastened to the compressor shaft, a cylindrical magnet mounted on at least a part of the rotor shaft, a shrink ring of non-magnetic material which holds the magnet on the rotor shaft and the rotor shaft including a bore for receiving one end of the compressor shaft. ### Claim 22 (depends on 21) The compression device according to claim 21, wherein the rotor has an outer diameter less than a diameter of an inlet to one of the at least one impeller wheel. ### Claim 23 (depends on 21) The compression device according to claim 21, wherein the rotor includes at least one non-magnetic stop on a side of the magnet. ### Claim 24 (depends on 21) The compression device according to claim 21, wherein the shrink ring comprises either titanium or carbon. ### Claim 25 (depends on 21) The compression device according to claim 21, wherein the rotor includes a portion having a diameter less than an end which is fastened to the compressor shaft, and the magnet is mounted on the portion having the diameter less than the end. ### Claim 26 (depends on 21) The compression device according to claim 21, wherein the rotor includes a flat surface which contacts a flat surface of an end of at least one of the at least one impeller wheel. ### Claim 27 (depends on 21) The compression device according to claim 21, wherein the rotor includes a cylindrical portion inserted into at least one of the at least one impeller wheel. ### Claim 28 (depends on 27) The compression device according to claim 27, wherein the portion of the rotor has an axial length that is 1.5 times a diameter of the compressor shaft. ### Claim 29 (depends on 27) The compression device according to claim 27, comprising a tubular sleeve mounted on the compressor shaft which is located between one end of one of the at least one impeller wheel and the cylindrical portion of the rotor. ### Claim 30 (depends on 21) The compression device according claim 21, wherein the rotor is fastened to the compressor shaft by a screw thread. ### Claim 31 (depends on 30) The compression device according to claim 30, wherein the rotor includes a handling adapter for moving the rotor. ### Claim 32 (depends on 31) The compression device according to claim 31, wherein the handling adapter is removable. ### Claim 33 (depends on 21) The compression device according to claim 21, wherein the compression device is a turbocharger comprising a turbine and a compressor. ### Claim 34 (depends on 33) The compression device according to claim 33, wherein the electric machine is located at a gas inlet of the turbocharger. ### Claim 35 (depends on 33) The compression device according to claim 33, wherein the electric machine includes a stator grid. ### Claim 36 A method for manufacturing a compression device comprising a rotor including a rotor shaft and a stator, a compressor shaft and at least one impeller wheel which is driven by an electric machine, comprising: a) mounting the at least one impeller wheel on the compressor shaft; b) mounting a cylindrical magnet on at least a part of shaft of the rotor; c) attaching the cylindrical magnet to the rotor shaft by a non-magnetic shrink ring; and d) inserting one end of the compressor shaft into a bore of the rotor shaft, and fastening the compressor shaft to the rotor shaft. ### Claim 37 (depends on 36) The method of manufacturing according to claim 36, comprising inserting the compressor shaft into the bore of the rotor shaft so that the rotor abuts the at least one impeller wheel by contact with flat surfaces. ### Claim 38 (depends on 36) The manufacturing method according to claim 36, comprising inserting the compressor shaft into the bore of the rotor shaft while a cylindrical portion of the rotor is inserted into the at least one impeller wheel. ### Claim 39 (depends on 36) The manufacturing method according to claim 36, comprising screwing the rotor shaft into to an end of the shaft of the compressor. ### Claim 40 (depends on 39) The manufacturing method according to claim 39, comprising rotating the rotor with a handling adapter.