# US 11,028,834 B2 · Generator for a wind turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,834 B2 - Document ID: US11028834B2 - Status: Granted - Kind: B2 - Application number: 16/285,991 - Filed: 2019-02-26 - Published: 2019-09-12 - Granted: 2021-06-08 - Earliest claimed: 2018-03-06 - Assignees: Siemens Gamesa Renewable Energy A/S - Applicants: Siemens Gamesa Renewable Energy A/S - Inventors: Peter Hessellund Soerensen - Web page: https://patentgrep.com/patent/US11028834B2 ## CPC - F03D 80/60: Cooling or heating of wind motors - F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence) - F03D 80/80: Arrangement of components within nacelles or towers - H02K 1/20: with channels or ducts for flow of cooling medium - H02K 7/1838: {Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine} - H02K 9/04: having means for generating a flow of cooling medium - H02K 9/18: wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing - Y02E 10/72: Wind turbines with rotation axis in wind direction - F03D: WIND MOTORS - 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 A generator for a wind turbine, a direct drive wind turbine, and a method for manufacturing a generator for a wind turbine is provided. The generator includes a rotor, and a stator, wherein the stator includes a first radial side and a second radial side which is opposite of the first radial side, and wherein the rotor is arranged adjacent to the first radial side. The generator further includes a flow distribution element which is arranged adjacent to the second radial side such that a circumferential flow channel is formed between the flow distribution element and the second radial side. ## Claims ### Claim 1 A generator for a wind turbine, comprising: a rotor, wherein the rotor is an outer rotor; a stator comprising a plurality of stator laminations, wherein the stator comprises a first radial side and a second radial side which is opposite of the first radial side, wherein the rotor is arranged adjacent to the first radial side, wherein the stator is an inner stator, and in between two adjacently disposed stator laminations, a radial air duct is formed such that cooling fluid entering the rotor through a cooling opening flows along a radial inner side of the rotor and through the respective air ducts to an inside of the stator; and a flow distribution element which is arranged adjacent to the second radial side such that a circumferential flow channel is formed between the flow distribution element and the second radial side; wherein the flow distribution element comprises a base body which comprises a first axial end and a second axial end, the stator further comprising a first axial stator end and a second axial stator end, wherein the first axial stator end and the second axial stator end are arranged at opposite axial ends of the stator; wherein the flow distribution element further comprises a separation element which extends between the base body and the second radial side, and wherein the separation element separates a circumferential flow channel in two parts which are not in fluid communication over the separation element, wherein the two parts of the circumferential flow channel are a first part between the first axial end of the flow distribution element and the separation element and a second part between the separation element and the second axial end of the flow distribution element. ### Claim 2 (depends on 1) The generator according to claim 1, wherein the first axial end is spaced apart from the first axial stator end, and wherein the second axial end is spaced apart from the second axial stator end. ### Claim 3 (depends on 1) The generator according to claim 1, wherein the separation element is fixed to the second radial side. ### Claim 4 (depends on 3) The generator according to claim 3, wherein a first axial distance between the first axial end and the separation element is different to a second axial distance between the separation element and the second axial end. ### Claim 5 (depends on 3) The generator according to claim 3, wherein a first axial distance between the first axial end and the separation element is equal to a second axial distance between the separation element and the second axial end. ### Claim 6 (depends on 1) The generator according to claim 1, wherein the base body is formed as a circumferentially closed body. ### Claim 7 (depends on 1) The generator according to claim 1, wherein seen in a sectional view having a normal being parallel to the axial direction of the stator, a surface of the first axial end and a surface of the second axial end are shaped at least one of: circular, elliptic, polygonal, star-shaped, star shaped with rounded vertices and/or undulated. ### Claim 8 (depends on 1) The generator according to claim 1, wherein an axial extension of the base body between the first axial end and the second axial end is in a shape of a straight line being parallel to an axial direction of the stator, in a sloped straight line being sloped relatively to the axial direction of the stator, at least one of: a stepped curve, a saw-toothed curve, an undulated curve, and a curve. ### Claim 9 (depends on 1) The generator according to claim 1, wherein the stator comprises a plurality of stator segments. ### Claim 10 (depends on 1) The generator according to claim 1, further comprising a fan which is arranged inside the stator. ### Claim 11 (depends on 1) A direct drive wind turbine comprising a generator according to claim 1, and a plurality of blades operably connected to the direct drive wind turbine. ### Claim 12 A method for manufacturing a generator for a wind turbine, comprising: providing a rotor, the rotor being an outer rotor; providing a stator comprising a plurality of stator laminations, wherein the stator comprises a first radial side and a second radial side which is opposite of the first radial side, wherein the rotor is arranged adjacent to the first radial side, wherein the stator is an inner stator, and in between two adjacently disposed stator laminations, a radial air duct is formed such that cooling fluid entering the rotor through a cooling opening flows along a radial inner side of the rotor and through the respective air ducts to an inside of the stator; and providing a flow distribution element adjacent to the second radial side such that a circumferential flow channel is formed between the flow distribution element and the second radial side; wherein the flow distribution element comprises a base body which comprises a first axial end and a second axial end, wherein the stator further comprises a first axial stator end and a second axial stator end, wherein the first axial stator end and the second axial stator end are arranged at opposite axial ends of the stator, wherein the method further comprises: determining a shape of an axial extension of the base body dependent on a fluid flow in the circumferential flow channel; wherein the flow distribution element further comprises a separation element and a base body which comprises a first axial end and a second axial end, wherein the stator further comprises a first axial stator end and a second axial stator end, wherein the first axial stator end and the second axial stator end are arranged at opposite axial ends of the stator; wherein the separation element separates a circumferential flow channel in two parts which are not in fluid communication over the separation element, wherein the two parts of the circumferential flow channel are a first part between the first axial end of the flow distribution element and the separation element and a second part between the separation element and the second axial end of the flow distribution element.