WO2003064854A1 - Moyeu de pale pour eolienne - Google Patents

Moyeu de pale pour eolienne Download PDF

Info

Publication number
WO2003064854A1
WO2003064854A1 PCT/DK2003/000064 DK0300064W WO03064854A1 WO 2003064854 A1 WO2003064854 A1 WO 2003064854A1 DK 0300064 W DK0300064 W DK 0300064W WO 03064854 A1 WO03064854 A1 WO 03064854A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
hub
hollow body
main shaft
rib
Prior art date
Application number
PCT/DK2003/000064
Other languages
English (en)
Inventor
Steffen Sorensen
Thomas Krag Nielsen
Original Assignee
Neg Micon A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neg Micon A/S filed Critical Neg Micon A/S
Publication of WO2003064854A1 publication Critical patent/WO2003064854A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a blade-hub for a wind turbine, where the design of the blade-hub results in significant stress reduction and reduced deformations.
  • blade-hubs For smaller wind turbines, welded constructions have been used for blade-hubs. However, in order to obtain stronger blade-hubs for larger wind turbines, they are generally designed as a hollow body defined between two spheres, an inner and an outer sphere, often with their centres slightly displaced to get the optimal distribution of the stress introduced in the blade-hub by the turbine blades.
  • the blade-hub is designed as a hollow body construction to reduce the weight of it and to optimise the strength thereof.
  • Turbine blades are attached to the blade-hub via flanges and bearings to allow for pitching of the blades.
  • the flanges are designed with an opening within each of them. Furthermore, this opening is used to provide access for pitching means for pitching the turbine blades. Due to the openings in the blade-hub the area between these openings is small and therefore large stress concentrations may occur in the material in this area during operation of the wind turbine, and deformations may arise as consequence thereof.
  • the area between the openings may be enlarged and the stress thus lowered by increasing the diameter of the blade-hub as the dimensions of the turbine blades are increased.
  • the costs of manufacture of the larger structure increases more than proportional with the size, in particular for cast-iron structures, and the greater weight causes the problems discussed above.
  • Another solution is to use blade-hubs with larger material thickness. This will however have the negative side effect of increasing the weight of the blade-hub and tests have shown that the problems are not solved satisfactory.
  • the object of the present invention is to provide a blade-hub design for larger wind turbines, in which the stresses during operation are kept at an acceptable level without increasing the weight of the blade-hub excessively.
  • This objective is met by the present invention according to which rib-stiffeners are added to the hollow body blade-hub flanges substantially in the plane of the flanges to provide a larger area for the stresses and thus prevent excessive stress concentrations.
  • the design of providing the rib-stiffeners substantially in the plane of the flanges increases the stiffness of these flanges and prevents deformation of the flanges, thus preventing deformation of the blade bearings attached to the flange.
  • a deformation of the bearings is disadvantageous and results in an excessive wear of the bearing and lowering of the durability of the bearings.
  • the present invention relates to a blade-hub for a wind turbine, where the blade-hub is a hollow body having blade flanges for the attachment of wind turbine blades.
  • a rib-stiffener is extending substantially in the plane of the flange, so as to increase the area affected by stresses and thus preventing stress concentration as well as to gain stiffness of the blade-hub in the planes of the flanges, thus preventing deformation of the flanges and the bearings attached thereto.
  • the area of the rib-stiffener in the plane of the flange is within the range of 30 to 80% of the cross-sectional area of the wind turbine blade root, preferably in the range of 40-60% of the cross-sectional area.
  • the outer shape of the hollow body blade-hub is generally defined by revolution of a smooth curve.
  • Said curve may be substantially normal to the axis of rotation at the intersections of the two at the front end of the blade-hub and/or at the back end of the blade-hub.
  • a smooth curve is understood a curve having a substantially continuous derivative. This design ensures optimal distribution of stress introduced in the blade-hub by preventing stress concentrations at sharp bends.
  • the shape is only generally defined by the curve revolution and the blade-hub may comprise smaller projection e.g. for the fastening of turbine blades to the hub.
  • the hollow body may have an opening defined within each of said blade flanges, in which case it is preferred that the rib-stiffeners extend inwardly of the openings of the blade flanges. Alternatively, the rib-stiffeners may extend outwardly from the flanges.
  • a pitching hole may be formed in each of the rib-stiffeners to provide access for a drive means for pitching the turbine blade, such as a toothed wheel attached to the drive shaft of an electric motor and engaging a toothed rim of the part of the bearing attached to the blade root.
  • holes may advantageously be formed in each of the rib-stiffeners to provide access to tightening wind turbine blade bearing bolts, which are connecting the bearings to the turbine blades.
  • the blade-hub and the rib-stiffeners are integrally formed using e.g. composite materials or ceramics, however in a preferred embodiment they are cast in one piece e.g. from cast iron.
  • the rib-stiffeners should be designed such that the resulting stiffness of the blade-hub will prevent deformations of the diameter of the flanges exceeding a 1% change of diameter under operation of the wind turbine, preferably preventing deformations exceeding a 0.5% change, and most preferred preventing deformations exceeding a 0.1-0.2% change.
  • a blade-hub may also be part of a wind turbine blade-hub assembly comprising a hollow body blade-hub and a hollow body main shaft and also comprising adaptation means for a wind turbine main bearing encircling the main shaft.
  • the hollow body blade-hub and the hollow body main shaft being integrally formed or cast in one piece to reduce the number of components. Furthermore, the lack of interface between these two main parts also gives the possibility of reducing the weight due to the reduction of stress introduced in the blade-hub assembly.
  • the main shaft of the blade-hub assembly extends at least 50% in the orientation of the axis of rotation compared to the size of the blade-hub to ensure optimal operating conditions.
  • the adaptation means for the main bearing is positioned at the main shaft of the blade-hub assembly at a distance of 20 to 250 cm from the blade-hub, preferable 30-80 cm, also ensuring optimal operating conditions.
  • the design of the blade-hub may be as the above described hollow body blade-hub with integrated rib-stiffeners, making it possible to combine the new design of the blade-hub with the blade-hub assembly.
  • Fig. 1 is a perspective view of a blade-hub according to a first aspect embodiment of the present invention, with rib-stiffeners according to the invention provided
  • Fig. 2 is a cross-section of a detail of the blade-hub according to the invention as shown in Fig. 1 and a bearing and a wind turbine blade attached thereto, and
  • Fig. 3 is a perspective view of a second aspect embodiment of the blade-hub and main shaft assembly according to the present invention.
  • Fig. 1 shows a hollow body blade-hub 1 with blade flanges 2 and integrated rib-stiffeners 3.
  • the figure shows blade flanges 2 for the attachment of three turbine blades and shows the main shaft flange 4 for the attachment of the hub to the main shaft.
  • Rib- stiffeners 3 are added to the flanges 2, said rib-stiffeners 3 extending inwardly of the flanges 2.
  • an opening 5 is formed for the provision of a pitch motor.
  • holes 6 have been formed between the flange 2 and the rib-stiffener 3 for providing access to tightening the bearing bolts of the turbine blades.
  • Fig.2 shows in cross-section a detail of the hollow body blade-hub 1.
  • the turbine blade 7 is attached to the blade-hub 1 by means of bearing bolts 9.
  • the rib-stiffener 3 is extending inwardly of the flange 2.
  • the bearing 8 and the bearing bolts 9 for the attachment of the turbine blade 7 to the blade-hub 1 can also be seen.
  • the rib-stiffeners extend inwardly to an extend so that the area of the rib-stiffeners 3 cover a large portion of an opening 10 in the hub, said opening 10 being delimited by the blade flange 2.
  • the rib-stiffeners cover in the range of 30-80% of the entire area of the opening 10, preferably in the range of 40-60% of the area of the opening 10.
  • the thickness of the rib-stiffeners may be in the range of 5-100 mm, possibly in the range of 10-50 mm.
  • the thickness of the rib-stiffeners 3 very much depend on the size of the blade-hub 1 and the desired stiffness of the blade-hub 2 in comparison with the design and the dimensioning of the different parts of the blade-hub 2.
  • the extension of the rib-stiffeners 3 of course has an effect on the stiffness obtained of the entire hollow body 1.
  • the rib-stiffeners should not cover too much of the area of the opening 10, because access should still be possible to the interior of the blades, when being mounted to the flange 2 along the bearing 8. Therefore, a balancing between the stiffening effect of the rib-stiffeners and the limited accessibility to the interior of the blades must be made, when designing how much of the area of the opening 10 that the rib-stiffeners 3 should cover.
  • the demand for accessibility is also prevailing, when taking the holes 6 in view. These holes 6 are just the point of obtaining accessibility to the tightening the bearing bolts 9.
  • the rib-stiffeners 3 are provided for obtaining a reduction of the deformations of the hub 1 during operation of the wind turbine.
  • the rib-stiffeners 3 should result in an decrease in deformation of the blade-hub preventing deformation of the diameter of the flanges exceeding a 1% change of diameter under operation of the wind turbine, preferably preventing deformations exceeding a 0.5% change, and most preferred preventing deformations exceeding a 0.1-0.2% change.
  • the flange 2 and the rib-stiffener 3 is shown as one and the same member.
  • the flange and the rib-stiffeners are integrally formed, perhaps by being cast in one piece.
  • Provision of hole 5 for the pitch motor and holes for accessibility to the bearing bolts are made after casting.
  • Fig. 3 shows an integrated hollow body blade-hub 1 and hollow body main shaft 11.
  • the integration of the blade-hub and of the main shaft constitutes a second aspect of the invention, primarily differing from the first aspect in the integration of the two wind turbine parts.
  • the figure shows flanges 2 for the attachment of three turbine blades. Rib-stiffeners can be added to the flanges 2 extending inwardly of the flanges 2. This is not shown at the figure.
  • the rib-stiffeners may be integrate with the blade-hub and the main shaft. Alternatively, the rib-stiffeners may be added to the blade-hub by welding or other means of joining a separate rib-stiffeners with the flanges 2 of the blade-hub.
  • the main shaft 11 has adaptation means 12 for a wind turbine main bearing encircling the shaft 11.
  • the adaptation means may be provided at different distances from the blade hub depending on the desired and obtainable stiffness of the integrated main shaft and blade- hub.
  • the adaptation means is positioned at the main shaft at a distance of 20 to 250 cm from the blade-hub, preferable at a distance of 30-80 cm from the blade-hub.
  • the main shaft constitutes an integrate part together with the blade- hub, the main shaft contributes to the stiffness of the blade-hub.
  • the main shaft extends at least 50% in the orientation of the axis of rotation compared to the circumferential size of the blade-hub seen in a plane perpendicular to the longitudinal direction of the main shaft.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

L'invention concerne un moyeu de pale d'éolienne. Ce moyeu de pale comporte des éléments de renfort qui s'avancent vers l'intérieur à partir du rebord du moyeu de pale, en suivant le plan de l'ouverture délimitée par le rebord. Ces éléments de renfort contribuent à donner une rigidité suffisante au moyeu, en particulier aux moyeux de pales creux de grande taille adaptés aux dimensions sans cesse croissantes des éoliennes. La dimension de ces éléments de renfort est calculée en fonction du degré de rigidité nécessaire pour le moyeu, mais également de manière à assurer un accès adéquat aux pales montées sur le moyeu, notamment un accès aux boulons d'appui et à la partie interne des pales.
PCT/DK2003/000064 2002-01-31 2003-01-31 Moyeu de pale pour eolienne WO2003064854A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200200156 2002-01-31
DKPA200200156 2002-01-31

Publications (1)

Publication Number Publication Date
WO2003064854A1 true WO2003064854A1 (fr) 2003-08-07

Family

ID=27635720

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2003/000064 WO2003064854A1 (fr) 2002-01-31 2003-01-31 Moyeu de pale pour eolienne

Country Status (1)

Country Link
WO (1) WO2003064854A1 (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004090326A1 (fr) * 2003-04-12 2004-10-21 General Electric Company Moyeu renforce du rotor d'une turbine d'energie eolienne
EP1596064A2 (fr) * 2004-05-11 2005-11-16 REpower Systems AG Dispositif de réglage du pas de l'hélice pour turbine éolienne
JP2008128135A (ja) * 2006-11-22 2008-06-05 Fuji Heavy Ind Ltd 水平軸風車のハブ
EP1933027A1 (fr) * 2006-12-08 2008-06-18 Harakosan Co. Ltd. Moyeu de rotor pour turbine éolienne
EP1959132A2 (fr) * 2007-02-14 2008-08-20 Nordex Energy GmbH Eolienne dotée d'une liaison rotative de pitch
DE102007008167A1 (de) * 2007-02-14 2008-08-21 Nordex Energy Gmbh Windenergieanlage mit einer Rotornabe
CN102182625A (zh) * 2011-01-24 2011-09-14 江苏兴盛风能科技有限公司 风力发电机组的轮毂毛坯件
US8047792B2 (en) 2005-07-05 2011-11-01 Vestas Wind Systems A/S Wind turbine pitch bearing, and use hereof
WO2011076795A3 (fr) * 2009-12-21 2011-12-29 Vestas Wind Systems A/S Moyeu pour une turbine éolienne et procédé de fabrication du moyeu
US8246312B2 (en) * 2011-06-24 2012-08-21 General Electric Company Hub assembly for use with a wind turbine and method of making the same
WO2013083386A2 (fr) 2011-12-06 2013-06-13 Siemens Aktiengesellschaft Éolienne
CN103459836A (zh) * 2011-03-30 2013-12-18 维斯塔斯风力系统有限公司 用于风轮机的轮毂
CN103842647A (zh) * 2011-09-30 2014-06-04 阿尔斯通可再生能源西班牙有限公司 风力涡轮机转子
DE102014226126A1 (de) * 2014-12-16 2016-06-16 Senvion Gmbh Rotornabe für einen eine Rotorachse aufweisenden Rotor einer Windenergieanlage
US10598159B2 (en) 2016-05-06 2020-03-24 General Electric Company Wind turbine bearings
CN111502908A (zh) * 2019-01-31 2020-08-07 西门子歌美飒可再生能源公司 用于风力涡轮机的毂、风力涡轮机以及用于升级风力涡轮机的毂的方法
US20210115904A1 (en) * 2019-10-18 2021-04-22 General Electric Company System for contactless displacement measurement of a blade root of a wind turbine
CN113464385A (zh) * 2021-07-26 2021-10-01 三一重能股份有限公司 一种风力发电机轮毂结构及风力发电机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002006667A1 (fr) * 2000-07-19 2002-01-24 Aloys Wobben Moyeu de pale

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2002006667A1 (fr) * 2000-07-19 2002-01-24 Aloys Wobben Moyeu de pale

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICH HAU: "Windturbines Fundamentals, Technologies, Application and Economics", SPRINGER-VERLAG, GERMANY, ISBN: 3-540-57064-0, XP002240153 *

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7244102B2 (en) * 2003-04-12 2007-07-17 General Electric Company Reinforced hub for the rotor of a wind energy turbine
EP2309120A3 (fr) * 2003-04-12 2014-04-16 General Electric Company Moyeu de rotor d'une éolienne
USRE41326E1 (en) * 2003-04-12 2010-05-11 General Electric Company Reinforced hub for the rotor of a wind energy turbine
WO2004090326A1 (fr) * 2003-04-12 2004-10-21 General Electric Company Moyeu renforce du rotor d'une turbine d'energie eolienne
EP1596064A3 (fr) * 2004-05-11 2011-08-31 REpower Systems AG Dispositif de réglage du pas de l'hélice pour turbine éolienne
EP1596064A2 (fr) * 2004-05-11 2005-11-16 REpower Systems AG Dispositif de réglage du pas de l'hélice pour turbine éolienne
US8047792B2 (en) 2005-07-05 2011-11-01 Vestas Wind Systems A/S Wind turbine pitch bearing, and use hereof
JP2008128135A (ja) * 2006-11-22 2008-06-05 Fuji Heavy Ind Ltd 水平軸風車のハブ
EP1930584A3 (fr) * 2006-11-22 2013-03-06 Hitachi, Ltd. Moyeu pour une turbine éolienne à axe horizontal
EP1930584B1 (fr) 2006-11-22 2016-06-29 Hitachi, Ltd. Moyeu pour une turbine éolienne à axe horizontal
US8142166B2 (en) 2006-11-22 2012-03-27 Fuji Jukogyo Kabushiki Kaisha Hub for a horizontal axis wind turbine
EP1933027A1 (fr) * 2006-12-08 2008-06-18 Harakosan Co. Ltd. Moyeu de rotor pour turbine éolienne
EP1959132A2 (fr) * 2007-02-14 2008-08-20 Nordex Energy GmbH Eolienne dotée d'une liaison rotative de pitch
US7874800B2 (en) 2007-02-14 2011-01-25 Nordex Energy Gmbh Wind energy plant with a pitch bearing
DE102007008167C5 (de) * 2007-02-14 2016-07-07 Nordex Energy Gmbh Windenergieanlage mit einer Rotornabe
US7780417B2 (en) 2007-02-14 2010-08-24 Nordex Energy Gmbh Wind energy plant with a rotor hub
EP1959132A3 (fr) * 2007-02-14 2010-06-23 Nordex Energy GmbH Eolienne dotée d'une liaison rotative de pitch
DE102007008167B4 (de) * 2007-02-14 2009-09-10 Nordex Energy Gmbh Windenergieanlage mit einer Rotornabe
DE102007008167A1 (de) * 2007-02-14 2008-08-21 Nordex Energy Gmbh Windenergieanlage mit einer Rotornabe
DE102007008166A1 (de) * 2007-02-14 2008-08-21 Nordex Energy Gmbh Windenergieanlage mit einer Pitchdrehverbindung
WO2011076795A3 (fr) * 2009-12-21 2011-12-29 Vestas Wind Systems A/S Moyeu pour une turbine éolienne et procédé de fabrication du moyeu
CN102822507A (zh) * 2009-12-21 2012-12-12 维斯塔斯风力系统有限公司 用于风轮机的轮毂和制造所述轮毂的方法
CN102182625A (zh) * 2011-01-24 2011-09-14 江苏兴盛风能科技有限公司 风力发电机组的轮毂毛坯件
CN103459836A (zh) * 2011-03-30 2013-12-18 维斯塔斯风力系统有限公司 用于风轮机的轮毂
US8246312B2 (en) * 2011-06-24 2012-08-21 General Electric Company Hub assembly for use with a wind turbine and method of making the same
CN103842647A (zh) * 2011-09-30 2014-06-04 阿尔斯通可再生能源西班牙有限公司 风力涡轮机转子
WO2013083386A2 (fr) 2011-12-06 2013-06-13 Siemens Aktiengesellschaft Éolienne
EP3034864A1 (fr) 2014-12-16 2016-06-22 Senvion GmbH Moyeu de rotor pour un rotor presentant un axe de rotor d'une eolienne
DE102014226126A1 (de) * 2014-12-16 2016-06-16 Senvion Gmbh Rotornabe für einen eine Rotorachse aufweisenden Rotor einer Windenergieanlage
US10598159B2 (en) 2016-05-06 2020-03-24 General Electric Company Wind turbine bearings
CN111502908A (zh) * 2019-01-31 2020-08-07 西门子歌美飒可再生能源公司 用于风力涡轮机的毂、风力涡轮机以及用于升级风力涡轮机的毂的方法
US20210115904A1 (en) * 2019-10-18 2021-04-22 General Electric Company System for contactless displacement measurement of a blade root of a wind turbine
US11946448B2 (en) * 2019-10-18 2024-04-02 General Electric Company System for contactless displacement measurement of a blade root of a wind turbine
CN113464385A (zh) * 2021-07-26 2021-10-01 三一重能股份有限公司 一种风力发电机轮毂结构及风力发电机

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