# US 10,374,488 B2 · Compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,488 B2 - Document ID: US10374488B2 - Status: Granted - Kind: B2 - Application number: 15/485,902 - Filed: 2017-04-12 - Published: 2017-08-03 - Granted: 2019-08-06 - Earliest claimed: 2014-10-13 - Assignees: BITZER Kuehlmaschinenbau GmbH - Applicants: BITZER Kuehlmaschinenbau GmbH - Inventors: Franck Repentin - Web page: https://patentgrep.com/patent/US10374488B2 ## CPC - H02K 9/12: wherein the cooling medium circulates freely within the casing - F25B 31/006: {Cooling of compressor or motor} - F25B 31/02: of motor-compressor units - H02K 1/246: {Variable reluctance rotors} - H02K 5/12: specially adapted for operating in liquid or gas (combined with cooling arrangements H02K9/00) - 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) - H02K 19/02: Synchronous motors - H02K 1/32: with channels or ducts for flow of cooling medium - H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS ## Abstract In a compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, it is provided that said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections being designed to uncover at least 70% of the cross section of apertures defined by said flux barriers in the respective disc element forming the respective front side of said rotor core. ## Claims ### Claim 1 Compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, said disc elements forming a rotor core each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections are designed to uncover at least 70% of a cross section of apertures defined by said flux barriers in the respective disc element forming the respective first and second front sides of said rotor core; wherein said support elements have arms acting on flux paths of the respective disc element forming the respective front side of said rotor core. ### Claim 2 (depends on 1) Compressor according to claim 1, wherein said cut-out sections in said support elements are designed such that at least 80% of the cross section of said channels in the respective front side is uncovered. ### Claim 3 Compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, said disc elements forming a rotor core each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections are designed to uncover at least 70% of a cross action of apertures defined by said flux barriers in the respective disc element forming the respective first and second front sides of said rotor core; wherein said support elements have arms acting on flux paths extending in radial direction to said rotor axis. ### Claim 4 (depends on 3) Compressor according to claim 3, wherein an angular width of said arms of said support elements is limited to an angular width of said respective radial flux path. ### Claim 5 Compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, said disc elements forming a rotor core each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections are designed to uncover at least 70% of a cross section of apertures defined by said flux barriers in the respective disc element forming the respective first and second front sides of said rotor core; wherein said support elements have an outer ring acting on an outer ring portions of the respective disc element forming said respective front side of said rotor core. ### Claim 6 Compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, said disc elements forming a rotor core each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections are designed to uncover at least 70% of a cross section of apertures defined by said flux barriers in the respective disc element forming the respective first and second front sides of said rotor core; wherein said support elements have an inner ring acting on an inner ring portion of the respective disc element forming the respective front side of said rotor core. ### Claim 7 (depends on 1) Compressor according to claim 1, wherein said support elements are connected by connecting elements extending through said rotor core. ### Claim 8 (depends on 1) Compressor according to claim 1, wherein said connecting elements are arranged in connecting channels formed by connection openings in said disc elements. ### Claim 9 Compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, said disc elements forming a rotor core each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections are designed to uncover at least 70% of a cross section of apertures defined by said flux barriers in the respective disc element forming the respective first and second front sides of said rotor core; wherein said support elements are connected by connecting elements extending through said rotor core; wherein said competing elements are arranged in connecting channels formed by connection openings in said disc elements; and wherein connection openings of said support elements are arranged in a plurality of arms acting on flux paths of said disc elements. ### Claim 10 (depends on 1) Compressor according to claim 1, wherein said support elements are provided with counterbalancing elements. ### Claim 11 Compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, said disc elements forming a rotor core each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, a plurality of elements are provided with flow reducing elements for reducing flow of refrigerant through at least part of said channels; and wherein said flow reducing elements are releasably mounted on said support elements. ### Claim 12 (depends on 11) Compressor according to claim 11, wherein said flow reducing elements are cover elements covering at least part of said channels. ### Claim 13 (depends on 1) Compressor according to claim 1, wherein the compressor is provided with a motor housing section said motor housing section being provided with said suction inlet. ### Claim 14 (depends on 13) Compressor according to claim 13, wherein said motor housing section supplies refrigerant to a first front side of the rotor. ### Claim 15 (depends on 13) Compressor according to claim 13, wherein refrigerant is guided in axial direction through said channels in said rotor from said first front side of said rotor to a second front side of said rotor. ### Claim 16 (depends on 15) Compressor according to claim 15, wherein refrigerant is discharged from a second front side of said rotor and guided to said compression unit. ### Claim 17 (depends on 13) Compressor according to claim 13, wherein the suction inlet supplies refrigerant to said electric motor through a suction opening arranged coaxial to an axis of rotation of said rotor. ### Claim 18 (depends on 17) Compressor according to claim 17, wherein said motor housing section is guiding said refrigerant supplied through said suction opening to the first front side of said rotor. ### Claim 19 (depends on 1) Compressor according to claim 1, wherein said rotor is arranged on a shaft and said shaft being supported by bearing systems arranged on opposite sides of said rotor. ### Claim 20 (depends on 1) Compressor according to claim 1, wherein said shaft is supported by bearing systems arranged on opposite sides of said compressor unit.