# US 2021/0344256 A1 · Rotor and machine having superconducting permanent magnets > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344256 A1 - Document ID: US20210344256A1 - Status: Published application - Kind: A1 - Application number: 17/282,394 - Filed: 2019-09-24 - Published: 2021-11-04 - Earliest claimed: 2018-10-02 - Assignees: Rolls-Royce Deutschland Ltd & Co KG - Applicants: Rolls-Royce Deutschland Ltd & Co KG - Inventors: Peter Kummeth - Web page: https://patentgrep.com/patent/US20210344256A1 ## CPC - H01F 6/06: Coils, e.g. winding, insulating, terminating or casing arrangements therefor - H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10) - H01F 27/363: {made of electrically conductive material} - H02K 1/278: Surface mounted magnets; Inset magnets - H02K 11/012: {Shields associated with rotating parts, e.g. rotor cores or rotary shafts} - H02K 11/0141: {Shields associated with casings, enclosures or brackets} - H02K 55/02: of the synchronous type - H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information - Y02E 40/60: Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The invention relates to a rotor (5) for an electric machine (1) having a central rotor axis (A). The rotor comprises a rotor carrier (7), at least one superconducting permanent magnet (9) carried mechanically separately by the rotor carrier (7), and a damper shield having at least one shielding element (13a, 13i), which surrounds the at least one superconducting permanent magnet (9) and which is formed from an electrically conductive material having an electric conductivity of less than 30·106 S/m. The invention further relates to an electrical machine (1) having a rotor (5) of this kind. ## Claims ### Claim 1 A rotor for an electrical machine with a central rotor axis, the rotor comprising: a rotor support; at least one superconducting permanent magnet that is mechanically supported by the rotor support; and a damping shield with at least one shielding element that surrounds the at least one superconducting permanent magnet and is formed from an electrically conductive material with an electrical conductivity σ of at least 30·106 S/m. ### Claim 2 (depends on 1) The rotor of claim 1, wherein the at least one shielding element has a thickness of at least 0.1 mm. ### Claim 3 (depends on 1) The rotor of claim 1, in which the electrically conductive material of the at least one shielding element comprises copper, aluminum, or copper and aluminum. ### Claim 4 (depends on 1) The rotor of claim 1, wherein the damping shield has an external shielding element that radially surrounds the at least one superconducting permanent magnet and the rotor support together. ### Claim 5 (depends on 4) The rotor of claim 4, wherein the external shielding element is provided with a plurality of cooling fins on an outer surface of the external shielding element. ### Claim 6 (depends on 1) The rotor of claim 1, wherein the damping shield has at least one internal shielding element that is associated with the at least one superconducting permanent magnet and surrounds the at least one superconducting permanent magnet locally such that the at least one internal shielding element, together with the at least one associated superconducting permanent magnet, is mechanically supported by the rotor support. ### Claim 7 (depends on 6) The rotor of claim 6, wherein the at least one internal shielding element is thermally more strongly coupled to the rotor support (7) than to the at least one associated superconducting permanent magnet. ### Claim 8 (depends on 7) The rotor of claim 7, further comprising a thermal insulation layer that is arranged between the at least one internal shielding element and the at least one associated superconducting permanent magnet. ### Claim 9 (depends on 6) The rotor of claim 6, wherein the at least one internal shielding element, together with the at least one associated superconducting permanent magnet, forms a prefabricated component. ### Claim 10 (depends on 6) The rotor of claim 6, wherein the at least one internal shielding element is composed of a shielding vessel and a shielding cover. ### Claim 11 (depends on 6) The rotor of claim 6, wherein the at least one superconducting permanent magnet comprises a plurality of superconducting permanent magnets that are surrounded either individually or combined in groups by respectively associated internal shielding elements, wherein the internal shielding elements are each arranged at least partly between the associated superconducting permanent magnet and the rotor support. ### Claim 12 (depends on 1) The rotor of claim 1, wherein the at least one superconducting permanent magnet comprises a high-temperature superconducting material. ### Claim 13 (depends on 1) The rotor of claim 1, wherein the at least one superconducting permanent magnet is formed by a stack of a plurality of superconducting strip conductors. ### Claim 14 (depends on 1) The rotor of claim 1, wherein the at least one superconducting permanent magnet is formed by a superconducting bulk element. ### Claim 15 An electrical machine comprising: a rotor for an electrical machine with a central rotor axis, the rotor comprising: a rotor support; at least one superconducting permanent magnet that is mechanically supported by the rotor support; and a damping shield with at least one shielding element that surrounds the at least one superconducting permanent magnet and is formed from an electrically conductive material with an electrical conductivity a of at least 30·106 S/m; and a stator that is arranged in a fixed manner.