# US 10,873,228 B2 · Rotor of an electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,228 B2 - Document ID: US10873228B2 - Status: Granted - Kind: B2 - Application number: 15/751,348 - Filed: 2016-06-17 - Published: 2018-08-16 - Granted: 2020-12-22 - Earliest claimed: 2015-08-12 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: Benjamin Volkmuth; Rolf Vollmer - Web page: https://patentgrep.com/patent/US10873228B2 ## CPC - H02K 1/325: {between salient poles} - H02K 1/02: characterised by the magnetic material - H02K 1/16: Stator cores with slots for windings - H02K 1/17: Stator cores with permanent magnets - H02K 1/20: with channels or ducts for flow of cooling medium - H02K 1/246: {Variable reluctance rotors} - H02K 1/32: with channels or ducts for flow of cooling medium - H02K 9/02: by ambient air flowing through the machine - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 9/197: in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator - H02K 15/022: with salient poles - H02K 16/04: Machines with one rotor and two stators - H02K 21/40: with flux distributors rotating around the magnets and within the armatures - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A bell-shaped rotor of an electric machine includes a cylindrical segment and a conical segment, wherein the cylindrical segment has magnetically active regions and nonmagnetic regions, where the rotor is produced at least partially via an additive production method, where the electric machine includes, in particular, an outer stator, an inner stator, which is arranged concentric to the outer stator within the outer stator, and the rotor, which is arranged concentric to the outer stator and the inner stator between the outer stator and the inner stator. ## Claims ### Claim 1 A rotor of an electric machine, rotor comprising: a cylindrical section having magnetically active areas and non-magnetic areas; and an additively manufactured conical section having a web structure arranged entirely within a periphery of the additively manufactured conical section. ### Claim 2 (depends on 1) The rotor as claimed in claim 1, wherein the rotor includes radial holes. ### Claim 3 (depends on 2) The bell-shaped rotor as claimed in claim 2, wherein a non-magnetic area forms an air vane. ### Claim 4 (depends on 1) The rotor as claimed in claim 1, wherein a non-magnetic area forms an air vane. ### Claim 5 (depends on 1) The rotor as claimed in claim 1, wherein the magnetically active area has a lamination. ### Claim 6 (depends on 1) The rotor as claimed in claim 1, wherein the rotor is bell-shaped. ### Claim 7 An electric machine comprising: an external stator; an internal stator arranged concentric to the external stator and within the external stator; and a rotor comprising a cylindrical section having magnetically active areas and non-magnetic areas and an additively manufactured conical section having a web structure arranged entirely within a periphery of the additively manufactured conical section, the rotor being arranged concentric to the external stator and the internal stator between the external stator and the internal stator and which is moveable relative to the external stator and the internal stator; wherein the external stator includes a plurality of windings, the internal stator includes a plurality of permanent magnets; and wherein the rotor comprises a carrier element formed from a non-magnetic material and which has a plurality of cutouts into which a soft-magnetic segment is arranged in each case. ### Claim 8 (depends on 7) The electric machine as claimed in claim 7, further comprising: a first cooling device for cooling the internal stator. ### Claim 9 (depends on 8) The electric machine as claimed in claim 8, further comprising: a second cooling device for cooling the external stator. ### Claim 10 (depends on 9) The electric machine as claimed in claim 9, wherein at least one of (i) the first cooling device and (ii) the second cooling device includes a plurality of cooling tubes through which cooling fluid passes. ### Claim 11 (depends on 10) The electric machine as claimed in claim 10, wherein the cooling tubes are arranged in an iron core of at least one of (i) the internal stator and (ii) the external stator. ### Claim 12 (depends on 11) The electric machine as claimed in claim 11, wherein the cooling tubes are arranged distributed uniformly in a peripheral direction along an axial direction of the electric machine. ### Claim 13 (depends on 10) The electric machine as claimed in claim 10, wherein the cooling tubes are arranged distributed uniformly in a peripheral direction along an axial direction of the electric machine. ### Claim 14 (depends on 7) The electric machine as claimed in claim 7, wherein the plurality of permanent magnets of the internal stator are formed from a ferrite. ### Claim 15 (depends on 7) The electric machine as claimed in claim 7, wherein the plurality of permanent magnets of the internal stator contain neodymium iron boron. ### Claim 16 (depends on 7) The electric machine as claimed in claim 7, wherein the rotor is connected to a hollow shaft. ### Claim 17 (depends on 7) The electric machine as claimed in claim 7, wherein the rotor is bell-shaped. ### Claim 18 A method for producing a bell-shaped rotor of an electric machine, the method comprising: manufacturing the bell-shaped rotor at least partially via an additive manufacturing method; and manufacturing a lamination by alternately solidifying different materials. ### Claim 19 (depends on 18) The method as claimed in claim 18, further comprising: manufacturing the bell-shaped rotor to include a cylindrical section having magnetically active areas and non-magnetic areas and a conical section having a web structure. ### Claim 20 (depends on 18) The method as claimed in claim 18, wherein the rotor is bell-shaped.