# US 10,865,704 B2 · Method for operating an electric media-flow machine, control unit, media-flow machine, compressor and/or turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,704 B2 - Document ID: US10865704B2 - Status: Granted - Kind: B2 - Application number: 16/439,356 - Filed: 2019-06-12 - Published: 2019-12-19 - Granted: 2020-12-15 - Earliest claimed: 2018-06-15 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Udo Sieber - Web page: https://patentgrep.com/patent/US10865704B2 ## CPC - F02B 37/14: {Control} of the alternation between {or the operation of} exhaust drive and other drive of a pump, e.g. dependent on speed - 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} - 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 29/4213: {suction ports} - H02K 21/20: having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar machine - F04D 25/066: {Linear Motors} - F05D 2210/12: gaseous, i.e. compressible - F05D 2220/40: in turbochargers - F05D 2270/62: Electrical actuators - Y02T 10/12: Improving ICE efficiencies - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method is described for operating an electric media-flow machine for a compressor and/or a turbine, especially for an exhaust-gas turbocharger of an internal combustion engine, having a shaft rotationally mounted in a housing that has an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, having a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to the inside, having a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially. An outer sleeve is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, and the stator teeth extending through the outer sleeve at least up to the inner sleeve. ## Claims ### Claim 1 A method for operating an electric media-flow machine for at least one of a compressor and a turbine comprising a shaft rotationally mounted in a housing having an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, the electric media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the electric media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the electric media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for the medium flowing from the inlet to the outlet through the media-flow machine, the method comprising: driving the drive winding at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor, wherein a holding force of deposited ferromagnetic particles on the rotor is canceled such that the deposited ferromagnetic particles detach from the rotor. ### Claim 2 (depends on 1) The method as recited in claim 1, wherein the electric media-flow machine is for an exhaust-gas turbocharger of an internal combustion engine. ### Claim 3 (depends on 1) The method as recited in claim 1, further comprising generating the opposing field as a function of an angular position of the rotor. ### Claim 4 (depends on 3) The method as recited in claim 3, further comprising determining the angular position by one of an induction-based process and a current-injection process. ### Claim 5 (depends on 1) The method as recited in claim 1, further comprising generating the opposing field with a constant strength. ### Claim 6 (depends on 1) The method as recited in claim 1, further comprising generating the opposing field with a pulsating strength. ### Claim 7 (depends on 1) The method as recited in claim 1, further comprising generating the opposing field equiangularly relative to the rotor magnetic field. ### Claim 8 (depends on 1) The method as recited in claim 1, further comprising generating the opposing field in a manner deviating by a predefineable angle from the rotor magnetic field. ### Claim 9 (depends on 8) The method as recited in claim 8, wherein the predefineable angle is up to 90°. ### Claim 10 A control unit for operating an electric media-flow machine for at least one of a compressor and a turbine comprising a shaft rotationally mounted in a housing having an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, the electric media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the electric media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the electric media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for the medium flowing from the inlet to the outlet through the media-flow machine, wherein the control unit carries out a method for operating the electric media-flow machine, the method comprising: driving the drive winding at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor, wherein a holding force of deposited ferromagnetic particles on the rotor is canceled such that the deposited ferromagnetic particles detach from the rotor. ### Claim 11 (depends on 10) The control unit as recited in claim 10, wherein the at least one of the compressor and the turbine is an exhaust-gas turbocharger. ### Claim 12 An electric media-flow machine mounted to a shaft that is rotationally mounted in a housing having an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, the electric media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the electric media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the electric media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for the medium flowing from the inlet to the outlet through the media-flow machine, wherein a control unit is configured to drive the drive winding at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor, wherein a holding force of deposited ferromagnetic particles on the rotor is configured to be canceled such that the deposited ferromagnetic particles detach from the rotor. ### Claim 13 At least one of a compressor and a turbine, comprising: a housing; at least one of a compressor impeller and a turbine wheel; a shaft that is rotationally mounted in the housing and on which the at least one of the compressor impeller and the turbine wheel is disposed in rotatably fixed manner; and a media-flow machine including a rotor disposed in rotatably fixed manner on the shaft, the media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for a medium flowing from an inlet to an outlet through the media-flow machine, wherein the drive winding is configured to be driven by a control unit at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor, wherein a holding force of deposited ferromagnetic particles on the rotor is configured to be canceled such that the deposited ferromagnetic particles detach from the rotor. ### Claim 14 (depends on 13) The at least one of the compressor and the turbine as recited in claim 13, wherein the at least one of the compressor and the turbine is an exhaust-gas turbocharger for an internal combustion engine of a motor vehicle.