# US 2019/0356191 A1 · Electrical isolation mounting of electrical machine stator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356191 A1 - Document ID: US20190356191A1 - Status: Published application - Kind: A1 - Application number: 16/473,151 - Filed: 2017-11-28 - Published: 2019-11-21 - Earliest claimed: 2016-12-23 - Assignees: Vestas Wind Systems A/S - Applicants: Vestas Wind Systems A/S - Inventors: Lars Dyred SIMONSEN; Peter MONGEAU - Web page: https://patentgrep.com/patent/US20190356191A1 ## CPC - H02K 11/00: Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection (casings, enclosures or supports H02K5/00) - H02K 11/0141: {Shields associated with casings, enclosures or brackets} - F03D 9/255: {connected to electrical distribution networks; Arrangements therefor} - H02K 3/38: around winding heads, equalising connectors, or connections thereto - H02K 3/42: Means for preventing or reducing eddy-current losses in the winding heads, e.g. by shielding - H02K 3/50: Fastening of winding heads, equalising connectors, or connections thereto - H02K 5/24: specially adapted for suppression or reduction of noise or vibrations - H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)} - H02K 7/116: with gears - H02K 7/1838: {Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine} - H02K 11/05: Rectifiers associated with casings, enclosures or brackets - F05B 2220/7062: of the direct current (D.C.) type - H02K 5/08: Insulating casings - H02K 7/183: {wherein the turbine is a wind turbine (adaptation of a wind turbine to an electric generator F03D9/25)} - H02K 2203/15: Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables - H02M 1/123: {Suppression of common mode voltage or current} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y02E 10/76: Power conversion electric or electronic aspects - 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 - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention relates to a wind turbine with an electrical machine wherein said electrical machine comprises a stator (702) with one or more electrical winding(s) (704), said electrical winding(s) being arranged to be connected to an electrical grid (760) by at least one cable (740) with at least one phase conductor (746), the at least one cable (740) comprises at least one return path (744) to conduct leakage currents, and at least one electrical shield (745), the stator being electrically isolated from a stator housing (701). The invention also relates to a method for minimizing stray currents in an electrical machine in a wind turbine. ## Claims ### Claim 1 A wind turbine with an electrical machine wherein said electrical machine comprises a stator with one or more electrical winding, said electrical winding(s) being arranged to be connected to an electrical grid by at least one cable with at least one phase conductor, wherein the at least one cable comprises at least one return path to conduct leakage currents, and at least one electrical shield, the stator being electrically isolated from a stator housing. ### Claim 2 (depends on 1) The wind turbine according to claim 1, wherein the electrical winding(s) are connected to the electrical grid through at least one power converter. ### Claim 3 (depends on 2) The wind turbine according to claim 2, wherein the return path for leakage currents is connected to the stator in a first end of the at least one cable and a second end of the at least one cable is connected to a DC link midpoint of the at least one power converter. ### Claim 4 (depends on 2) The wind turbine according to claim 2, wherein the return path for leakage currents is connected to the stator in a first end of the at least one cable and a second end of the at least one cable is connected to a star point of a common mode filter of the at least one power converter. ### Claim 5 (depends on 2) The wind turbine according to claim 2, wherein the return path for leakage currents is connected to the stator in a first end of the at least one cable and a second end of the at least one cable is connected to a star point of a transformer, wherein the transformer is connected between the at least one power converter and the electrical grid. ### Claim 6 (depends on 2) The wind turbine according to claim 2, wherein the at least one shield is connected with a first end at the stator housing and a second end connected at a converter chassis. ### Claim 7 (depends on 1) The wind turbine according to claim 1, wherein the electrical machine is arranged to rotate at a speed range between 100 to 900 RPM. ### Claim 8 (depends on 7) The wind turbine according to claim 7, wherein the stator is isolated from the stator housing by a plurality of structural isolation bars attached to the stator, the structural isolation bars provide insulation between the stator and the stator housing, while the stator is suspended within the stator housing. ### Claim 9 (depends on 8) The wind turbine according to claim 8, wherein each of the structural isolation bars comprises one or more insulation elements, with a first side element, a second side element, an inserted steel core and a bolt received in the steel core, the one or more insulation elements insulate parts of the structural isolation bars while the bolt is arranged to be attached to a flange of the stator hosing. ### Claim 10 (depends on 1) The wind turbine according to claim 1, wherein the electrical machine is direct mounted together with a gearbox by a spline shaft. ### Claim 11 (depends on 1) The wind turbine according to claim 1, wherein the isolation elements also provide a mechanical dampening function. ### Claim 12 A method for minimizing stray currents in an electrical machine in a wind turbine, wherein said electrical machine comprises a stator with one or more electrical winding(s), said electrical winding(s) being arranged to be connected to an electrical grid by at least one cable with at least one phase conductor, the method comprising: conducting leakage currents through at least one return path in the at least one cable; shielding the at least one cable with at least one electrical shield; and isolating the stator electrically from a stator housing. ### Claim 13 (depends on 12) The method according to claim 12, wherein the electrical windings are connected to the electrical grid through at least one power converter.