# US 2013/0156560 A1 · Wind turbine nacelle cover and a method for installing a generator on a mainframe in a nacelle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156560 A1 - Document ID: US20130156560A1 - Status: Published application - Kind: A1 - Application number: 13/713,591 - Filed: 2012-12-13 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: Envision Energy (Denmark) ApS - Inventors: Henning Moestrup; Per Langfeldt - Web page: https://patentgrep.com/patent/US20130156560A1 ## CPC - F03D 13/40: Arrangements or methods specially adapted for transporting wind motor components - F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence) - F03D 13/10: Assembly of wind motors; Arrangements for erecting wind motors - F03D 80/00: Details, components or accessories not provided for in groups F03D1/00 - F03D17/00 - F03D 80/50: Maintenance or repair - F05B 2220/7066: via a direct connection, i.e. a gearless transmission - F05B 2240/14: Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y10T 29/49009: Dynamoelectric machine - 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 - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A wind turbine and to a method for installing a generator for a wind turbine, in which a nacelle and a mainframe for installation of, e.g., a generator and a main shaft, is installed on top of a tower. The nacelle further has a nacelle cover extending over the main frame from the hub and to a rear end, covering components installed on the main frame. The nacelle cover has at least a first part and a second part, the first part having a interface for engagement with a corresponding interface on the second part, the second part of the nacelle cover housing a generator as one unit. By having the generator and the second part of the nacelle cover as a single unit, installation can be performed in one go and then only one hoist with a crane is needed. ## Claims ### Claim 1 A wind turbine comprising a nacelle, said nacelle being installed on top of a generally vertical tower, said nacelle comprising a mainframe suitable for installation of a number of components including a generator, a main shaft, and a hub comprising a number of blades, said nacelle further comprising a nacelle cover extending over said main frame from the hub and to a rear end, covering components installed on the main frame, wherein that said nacelle cover comprising at least a first part and a second part, said first part having an interface for engagement with a corresponding interface on said second part, where said second part of the nacelle cover is housing a generator, and where said generator and said second part of a nacelle cover is construed as one unit. ### Claim 2 (depends on 1) A wind turbine according to claim 1, wherein that at least one of the nacelle cover parts on its interface part has at least one flexible sealing lip, preferably a resilient rubber part, said flexible sealing lip extending in a substantially radial direction from one nacelle cover part to another nacelle cover part. ### Claim 3 (depends on 1) A wind turbine according to claim 1, wherein that said unit comprising a generator in said second part of the nacelle cover further comprises installation means, where said installation means are either an integrated part of the generator or comprises one or more separate parts fixed to said generator, where said installation means comprise means for hoisting said unit. ### Claim 4 (depends on 1) A wind turbine according to claim 1, wherein that said second part of the nacelle cover further comprises at least one hatch, said at least one hatch being arranged above means for hoisting said unit. ### Claim 5 (depends on 1) A wind turbine according to claim 1, wherein that said interface on the first and second part of the nacelle cover has an angle between 0 and 90 degrees to horizontal. ### Claim 6 (depends on 5) A wind turbine according to claim 5, wherein that said interface on the first and second part of the nacelle cover is substantially vertical. ### Claim 7 (depends on 1) A wind turbine according to claim 1, wherein that said first part of a nacelle cover is a central part and the second part of the nacelle cover is a rear part of said nacelle cover, where the interface on the second/rear part is smaller than the interface of the first/central part of the nacelle cover, thus allowing the second interface to be installed inside the first interface, where sealing means are arranged on the circumference of the second interface on the second/rear part and where said sealing means are abutting the first interface on the first/central part. ### Claim 8 Method for assembling a generator unit and for installing such a generator unit on a wind turbine on a mainframe in a nacelle, said nacelle and mainframe being installed on top of a generally vertical tower, said mainframe being suitable for installation of further components such as a shaft and a hub, said shaft being directly or indirectly connected to said hub, where said hub comprises a number of blades, further said nacelle comprises a nacelle cover and said generator unit comprises at least a generator having a stator and a rotor, said stator having connection means for connection to said mainframe, and said rotor having connection means for connection to said shaft, wherein that said method for assembling and installing a generator unit at least comprises the steps of: installing a first/central nacelle cover part at said main frame providing the generator with installation means, covering said generator with a second/rear part of a nacelle cover part, said generator and second/rear nacelle cover part thus forming a single generator unit, hoisting said generator unit to the main frame, installing said generator at the main frame and at the same time installing said second/rear nacelle cover part to said first/central nacelle cover part via their corresponding interfaces. ### Claim 9 (depends on 8) Method for assembling a generator unit and for installing such a generator unit according to claim 8, wherein said method at least and further comprises the steps of: providing a installation stand comprising at least a foot part and a fixture for fixation of the installation stand to the stator of said generator, allowing said generator to be positioned with a distance to the ground, fixating said generator to said installation stand, providing the generator with installation means, installing a second/rear part of a nacelle cover part over said generator, transporting said generator unit on said installation stand to a storage or to an erection site for a wind turbine, connecting hoisting means to said generator unit, relieving the load on the installation stand by hoisting the generator unit from the ground, dismounting the installation stand from the generator, hoisting to and installing said generator unit at a mainframe in a nacelle on a wind turbine.