# US 2017/0288500 A1 · Stator assembly for an electric generator with accommodation space > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288500 A1 - Document ID: US20170288500A1 - Status: Published application - Kind: A1 - Application number: 15/462,947 - Filed: 2017-03-20 - Published: 2017-10-05 - Earliest claimed: 2016-03-30 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: UFFE ERIKSEN; EDOM LEMMA; CLAUS THYGESEN - Web page: https://patentgrep.com/patent/US20170288500A1 ## CPC - H02K 7/102: with friction brakes - F03D 1/00: Wind motors with rotation axis substantially parallel to the air flow entering the rotor (controlling thereof F03D7/02) - F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence) - H02K 1/187: {to inner stators} - H02K 1/2791: Surface mounted magnets; Inset magnets - H02K 7/116: with gears - 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 15/50: Disassembling, repairing or modifying dynamo-electric machines (repairing of cooling fluid boxes H02K15/38) - Y02E 10/72: Wind turbines with rotation axis in wind direction - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F03D: WIND MOTORS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A stator assembly is provided including (a) an inner frame structure having an annular shape with an inner circumferential edge and an outer circumferential edge, wherein the inner frame structure is formed around a center axis corresponding to an axial direction of the electric generator; and (b) an outer frame structure, which surrounds the inner frame structure and which, starting from the outer circumferential edge, includes two inclined annular walls which, along a radial direction, spread apart from each other such that in between a first inclined annular wall and the second inclined annular wall there is formed an accommodation space. Preferably, the inner frame structure and the outer frame structure are made from a single piece. ## Claims ### Claim 1 A stator assembly for an electric generator for use with a wind turbine, the stator assembly comprising: an inner frame structure having an annular shape with an inner circumferential edge and an outer circumferential edge, wherein the inner frame structure is formed around a center axis corresponding to an axial direction of the electric generator; and an outer frame structure, which surrounds the inner frame structure and which, starting from the outer circumferential edge, comprises two inclined annular walls which, along a radial direction, spread apart from each other such that in between a first inclined annular wall and the second inclined annular wall there is formed an accommodation space, wherein the inner frame structure and the outer frame structure are made as a single piece. ### Claim 2 (depends on 1) The stator assembly as set forth in claim 1, wherein the outer frame structure further comprises an annular flange, which, starting from the outer circumferential edge, extends along the axial direction and which is arranged in between the outer circumferential edge and the second inclined annular wall. ### Claim 3 (depends on 1) The stator assembly as set forth in claim 1, wherein within at least one of the two inclined a annular walls there is provided at least one opening allowing a human service technician to enter the accommodation space. ### Claim 4 (depends on 3) The stator assembly as set forth in claim 3, wherein within at least one of the two inclined annular walls there is provided at least one further opening, wherein the size of the further opening is larger than the size of the opening. ### Claim 5 (depends on 1) The stator assembly as set forth in claim 1, further comprising: cooling installations, which are accommodated within the accommodation space and which are configured for cooling components of the stator assembly and/or components of a rotor assembly of the electric generator. ### Claim 6 (depends on 5) The stator assembly as set forth in claim 5, wherein the cooling installations comprise: at least one ventilation device configured for driving a stream of a gaseous heat transfer medium through at least a part of the electric generator. ### Claim 7 (depends on 6) The stator assembly as set forth in claim 6, wherein the cooling installations further comprise: at least one heat exchanger configured for transferring heat between the gaseous heat transfer medium and a liquid heat transfer medium. ### Claim 8 (depends on 7) The stator assembly as set forth in claim 7, wherein within at least one of the two inclined annular walls there is provided at least one aperture allowing the gaseous heat transfer medium driven by the ventilation device, to flow between the inside of the accommodation space and the outside of the accommodation space, to flow from the inside of the accommodation space to the outside of the accommodation space. ### Claim 9 (depends on 8) The stator assembly as set forth in claim 8, wherein both the first inclined annular wall and the second inclined annular wall are provided with at least one aperture and/or with at least one opening and/or with the at least one further opening. ### Claim 10 (depends on 1) The stator assembly as set forth in claim 1, further comprising: a plurality of stator segments, each comprising at least one conductor coil in which during normal operation of the electric generator magnetic induction takes place, wherein the stator segments are mounted at the outer circumference of the outer frame structure in between a first radial outer edge of the first inclined annular wall and a second radial outer edge of the second inclined annular wall. ### Claim 11 (depends on 1) The stator assembly as set forth in claim 1, further comprising: at least one service platform, which is attached to the inner frame structure and which extends in the axial direction. ### Claim 12 (depends on 1) The stator assembly as set forth in claim 1, further comprising: at least one first mechanical interface, which is formed at the inner frame structure and which is configured for receiving a turning device which is configured for engaging with a rotor assembly of the electric generator and for turning the rotor assembly. ### Claim 13 (depends on 12) The stator assembly as set forth in claim 12, wherein the first mechanical interface is configured for receiving the turning device in a detachable manner. ### Claim 14 (depends on 1) The stator assembly as set forth in claim 1, further comprising: at least one second mechanical interface, which is formed at the inner frame structure and which is configured for receiving a brake caliper which is configured for engaging with a brake disk of the rotor assembly of the electric generator and for stopping a rotational movement of the rotor assembly. ### Claim 15 (depends on 14) The stator assembly as set forth in claim 14, wherein the at least one second mechanical interface is configured for receiving the brake caliper in a radially shiftable manner, wherein in a first radial position of the brake caliper a braking interaction between the brake caliper and the brake disk is possible and in a second radial position of the brake caliper a braking interaction between the brake caliper and the brake disk is not possible. ### Claim 16 (depends on 15) The stator assembly as set forth in claim 15, wherein the second mechanical interface comprises a guidance structure having a radial extension and the brake caliper comprises a guidance element which engages with the guidance structure. ### Claim 17 (depends on 16) The stator assembly as set forth in claim 16, further comprising: a fixation system for detachably fixing the brake caliper either in the first radial position or in the second radial position, wherein the fixation system comprises first fixation device being associated with a fixation of the brake caliper in the first radial position and second fixation device being associated with a fixation of the brake caliper in the second radial position. ### Claim 18 (depends on 17) The stator assembly as set forth in claim 17, wherein the first fixation device comprises a plurality of axially shiftable bolts, which are arranged in a one- or two-dimensional array, and/or the second fixation device comprises a clamping device. ### Claim 19 (depends on 1) The stator assembly as set forth in claim 1, further comprising at least one third mechanical interface, which is formed at the inner frame structure and which is configured for receiving at least a part of a rotor lock system which in a first axial position interlocks a rotational movement of the rotor assembly of the electric generator with respect to the stator assembly and in a second axial position enables a rotational movement of the rotor assembly with respect to the stator assembly. ### Claim 20 (depends on 1) An electric generator, in particular an electric generator for a wind turbine, the electric generator comprising a stator assembly as set forth in claim 1; and a rotor assembly rotatably supported at the stator assembly for rotating around the center axis, wherein in particular the electric generator has an inner stator-outer rotor configuration. ### Claim 21 (depends on 20) The electric generator as set forth in claim 20, wherein the outer frame structure has an outer diameter larger than 7 m and/or an air gap between the stator segments of the stator assembly and the magnets of the rotor assembly is smaller than 25 mm. ### Claim 22 (depends on 21) A wind turbine for generating electrical power, in particular an off-shore wind turbine, the wind turbine comprising a tower; a wind rotor, which is arranged at a top portion of the tower and which comprises at least one blade; and an electric generator as set forth in claim 21, wherein the electric generator is mechanically coupled with the wind rotor.