WO2011100987A1 - Method for assembling part of a generator, generator and wind turbine - Google Patents

Method for assembling part of a generator, generator and wind turbine Download PDF

Info

Publication number
WO2011100987A1
WO2011100987A1 PCT/EP2010/000961 EP2010000961W WO2011100987A1 WO 2011100987 A1 WO2011100987 A1 WO 2011100987A1 EP 2010000961 W EP2010000961 W EP 2010000961W WO 2011100987 A1 WO2011100987 A1 WO 2011100987A1
Authority
WO
WIPO (PCT)
Prior art keywords
generator
magnet
base element
mounting plate
welding
Prior art date
Application number
PCT/EP2010/000961
Other languages
French (fr)
Inventor
Kurt Andersen
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to US13/578,001 priority Critical patent/US20130038070A1/en
Priority to CA2789825A priority patent/CA2789825A1/en
Priority to JP2012553184A priority patent/JP2013520149A/en
Priority to BR112012020378A priority patent/BR112012020378A2/en
Priority to EP10716752A priority patent/EP2526608A1/en
Priority to CN201080064049.3A priority patent/CN102754310B/en
Priority to PCT/EP2010/000961 priority patent/WO2011100987A1/en
Publication of WO2011100987A1 publication Critical patent/WO2011100987A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2791—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807—Rotary generators
    • H02K7/1823—Rotary generators structurally associated with turbines or similar engines
    • H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
    • H02K7/1838—Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
    • 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 method for assembling part of a generator. It further relates to a generator and to a wind turbine .
  • Permanent magnet (PM) generator rotors for wind turbines are known in the art. Here rods or segments of permanent magnet material are mounted on the surface of a generator rotor on some rotor base construction. The purpose of the magnets is to induce current in generator stator coils which they pass when the generator rotor is rotating. It is of most importance that the magnets are sufficiently secured to the said rotor base construction as the distance between the magnets and the stator coils often is only a few millimetres.
  • EP 1 860 755 A2 a permanent magnet rotor arrangement is provided.
  • the arrangement includes a rotor having a radially outer rim.
  • a circumferential array of magnet carriers is a fixed to the outer rim of the rotor by means of at least one screw or bolt.
  • the bolts or screws penetrate the rotor base construction and are attached to a threaded portion of the mounting plate.
  • a first objective of the present invention is to provide an advantageous method for assembling part of a generator.
  • a second objective of the present invention is to provide an advantageous generator.
  • a third objective of the present invention is to provide an advantageous wind turbine.
  • the first objective is solved by the method for assembling part of a generator as claimed in claim 1.
  • the second objective is solved by a generator as claimed in claim 6.
  • the third objective is solved by a wind turbine as claimed in claim 14.
  • the depending claims define further developments of the invention.
  • a magnet assembly comprising at least one magnet and a mounting plating is fastened to a base element by welding the mounting plate to the base element.
  • welding instead of bolts, nuts or screws has the advantage, that it is simple, effective and cost-effective.
  • bolts, nuts or screws have to be mounted and tightened manually, while the spot welding can be performed by means of an industrial robot .
  • the magnet assembly may be positioned and maintained in the position before welding it to the base element.
  • the base element may be, for example, part of a rotor of the generator.
  • a non-magnetized magnet may be used.
  • the non- magnetized magnet can be magnetized after welding the mounting plate to the base element. Using a non-magnetized magnet is advantageous, because during the fastening process no attractive magnetic forces are acting between the magnet and the means for fastening.
  • the mounting plate is welded to the base element by means of an industrial robot .
  • Such industrial robot can perform multiple of the steps required for the mounting proc- ess.
  • the industrial robot may pick up a prein- stalled magnet assembly from storage and may position it in a correct position on the generator base element.
  • the base element may be, for example, a generator rotor base construe- tion.
  • the industrial robot may maintain the position during fastening without the need of other holding means.
  • the industrial robot can fasten the magnet assembly to the base element by welding the mounting plate to the base construction at a plurality of welding points, especially spot welding points, along the mounting plate construction.
  • the mounting plate may be fastened to the base element by spot-welding the mounting plate to the base element. Braze-welding and/or hard-soldering is also possible.
  • the permanent magnet assembly As to the number of welding points it must be ensured that enough points are made so that the permanent magnet assembly will maintain its position both during mounting and during operation.
  • the permanent magnet assembly has to be able to withstand any magnetic attractive forces that may occur once the magnet is magnetized. Furthermore, by the present invention it is ensured that at least the process of fastening the permanent magnet assembly to the base construction is shortened in time as the time consuming process of tightening nuts to specific moment-level is replaced by a speedy industrial robot spot welding proc- ess.
  • the inventive generator comprises a magnet assembly and a base element .
  • the magnet assembly comprises at least one magnet and a mounting plate.
  • the mounting plate is fastened to the base element by means of a number of welds, preferably spot-welds.
  • the generator may comprise a rotor.
  • the base element may be part of the rotor or the base element may be connected to the rotor.
  • the magnet assembly can comprise at least one permanent magnet.
  • the magnet can be segmented. This allows for an easy assembling.
  • a number of permanent magnets may be connected to the same mounting plate.
  • the magnet can be covered by a protective cover.
  • the protective cover can comprise stainless steel or a plastic material.
  • the protective cover may con- sist of stainless steel or a plastic material.
  • the protective cover provides a protection of the magnet or of the magnet material against corrosion and other environmental influences .
  • the generator may be a direct drive generator.
  • the mounting plate may be fastened to the base element by means of a number of spot -welds and/or braze-welds and/or hard-soldering .
  • the inventive wind turbine comprises an inventive generator, as previously described.
  • the inventive wind turbine has the same advantages as the inventive generator has.
  • welding comprises spot-welding, braze-welding and soldering, especially hard- soldering .
  • Figure 1 schematically shows a wind turbine.
  • Figure 2 schematically shows part of an inventive generator in a perspective view.
  • FIG. 1 schematically shows a wind turbine 1.
  • the wind turbine 1 comprises a tower 2, a nacelle 3 and a hub 4.
  • the nacelle 3 is located on top of the tower 2.
  • the hub 4 comprises a number of wind turbine blades 5.
  • the hub 4 is mounted to the nacelle 3.
  • the hub 4 is pivot -mounted such that it is able to rotate about a rotation axis 9.
  • a generator 6 is located inside the nacelle 3.
  • the wind turbine 1 is a di- rect drive wind turbine .
  • FIG. 2 schematically shows part of an inventive generator 6 in a perspective view.
  • the generator 6 comprises a magnet assembly 11 and a base element 12.
  • the magnet assembly 11 com- prises at least one magnet 13 and a mounting plate 14.
  • the magnet 13 is connected to the mounting plate 14.
  • a permanent magnet 13 is glued onto the mounting plate 14.
  • the mounting plate 14 is fastened to the base element 12 by spot -welding .
  • the weld points are designated by reference nu- meral 15.
  • the magnet 13 can be a permanent magnet.
  • a non-magnetized magnet 13 is used, which is magnetized after spot-welding the mounting plate 14 onto the base element 12. This avoids disturbing attractive magnetic forces between the elements.
  • the magnet 13 may be segmented. For example, a number of permanent magnets 13 may be glued onto one mounting plate 14.
  • the base element 12 may be part of the rotor of the generator 6 or it may be connected to the rotor of the generator 6.
  • the magnet 13 can be covered by a protective cover.
  • the protective cover may comprise stainless steel or a plastic material.
  • the protective cover provides a protection of the magnet material against corrosion and other environmental influences.
  • spot-welds instead of spot-welds also braze-welds or hard- soldering is possible.
  • the present invention provides a simple and cost- effective generator, especially for a wind turbine, and a simple and cost ef fective method for mounting of permanent magnet assemblies to a generator rotor base .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

A method for assembling part of a generator (6) is provided, wherein a magnet assembly (11) comprising at least one magnet (13) and a mounting plate (14) is fastened to a base element (12) by welding (15) the mounting plate (14) to the base element (12).

Description

Description
Method for assembling part of a generator, generator and wind turbine
The present invention relates to a method for assembling part of a generator. It further relates to a generator and to a wind turbine . Permanent magnet (PM) generator rotors for wind turbines are known in the art. Here rods or segments of permanent magnet material are mounted on the surface of a generator rotor on some rotor base construction. The purpose of the magnets is to induce current in generator stator coils which they pass when the generator rotor is rotating. It is of most importance that the magnets are sufficiently secured to the said rotor base construction as the distance between the magnets and the stator coils often is only a few millimetres. In EP 1 860 755 A2 a permanent magnet rotor arrangement is provided. The arrangement includes a rotor having a radially outer rim. A circumferential array of magnet carriers is a fixed to the outer rim of the rotor by means of at least one screw or bolt. The bolts or screws penetrate the rotor base construction and are attached to a threaded portion of the mounting plate.
One difficulty related to the former mentioned prior art is that the process of fitting or mounting the permanent magnets including their mounting plate to the rotor base is very time consuming because numerous bolts and nuts are required in order to hold and maintain the permanent magnet in the correct position and to withstand the magnetic attractive forces that act on the magnets once magnetized. The bolts have to be mounted and tightened manually.
A first objective of the present invention is to provide an advantageous method for assembling part of a generator. A second objective of the present invention is to provide an advantageous generator. A third objective of the present invention is to provide an advantageous wind turbine. The first objective is solved by the method for assembling part of a generator as claimed in claim 1. The second objective is solved by a generator as claimed in claim 6. The third objective is solved by a wind turbine as claimed in claim 14. The depending claims define further developments of the invention.
In the inventive method for assembling part of a generator a magnet assembly comprising at least one magnet and a mounting plating is fastened to a base element by welding the mounting plate to the base element. Using welding instead of bolts, nuts or screws has the advantage, that it is simple, effective and cost-effective. For example, bolts, nuts or screws have to be mounted and tightened manually, while the spot welding can be performed by means of an industrial robot .
The magnet assembly may be positioned and maintained in the position before welding it to the base element. The base element may be, for example, part of a rotor of the generator. Preferably, a non-magnetized magnet may be used. The non- magnetized magnet can be magnetized after welding the mounting plate to the base element. Using a non-magnetized magnet is advantageous, because during the fastening process no attractive magnetic forces are acting between the magnet and the means for fastening.
Preferably, the mounting plate is welded to the base element by means of an industrial robot . Such industrial robot can perform multiple of the steps required for the mounting proc- ess. For example, the industrial robot may pick up a prein- stalled magnet assembly from storage and may position it in a correct position on the generator base element. The base element may be, for example, a generator rotor base construe- tion. Moreover, the industrial robot may maintain the position during fastening without the need of other holding means. Furthermore, the industrial robot can fasten the magnet assembly to the base element by welding the mounting plate to the base construction at a plurality of welding points, especially spot welding points, along the mounting plate construction.
Preferably, the mounting plate may be fastened to the base element by spot-welding the mounting plate to the base element. Braze-welding and/or hard-soldering is also possible.
As to the number of welding points it must be ensured that enough points are made so that the permanent magnet assembly will maintain its position both during mounting and during operation. The permanent magnet assembly has to be able to withstand any magnetic attractive forces that may occur once the magnet is magnetized. Furthermore, by the present invention it is ensured that at least the process of fastening the permanent magnet assembly to the base construction is shortened in time as the time consuming process of tightening nuts to specific moment-level is replaced by a speedy industrial robot spot welding proc- ess.
The inventive generator comprises a magnet assembly and a base element . The magnet assembly comprises at least one magnet and a mounting plate. The mounting plate is fastened to the base element by means of a number of welds, preferably spot-welds. For example, the generator may comprise a rotor. The base element may be part of the rotor or the base element may be connected to the rotor. The magnet assembly can comprise at least one permanent magnet. Moreover, the magnet can be segmented. This allows for an easy assembling. For example, a number of permanent magnets may be connected to the same mounting plate. Advantageously, the magnet can be covered by a protective cover. The protective cover can comprise stainless steel or a plastic material. For example, the protective cover may con- sist of stainless steel or a plastic material. The protective cover provides a protection of the magnet or of the magnet material against corrosion and other environmental influences . Generally, the generator may be a direct drive generator.
The mounting plate may be fastened to the base element by means of a number of spot -welds and/or braze-welds and/or hard-soldering .
The inventive wind turbine comprises an inventive generator, as previously described. The inventive wind turbine has the same advantages as the inventive generator has. In the context of the present invention welding comprises spot-welding, braze-welding and soldering, especially hard- soldering .
Further features, properties and advantages of the present invention will become clear from the following description of an embodiment in conjunction with the accompanying drawings.
Figure 1 schematically shows a wind turbine. Figure 2 schematically shows part of an inventive generator in a perspective view.
An embodiment of the present invention will now be described with reference to Figure 1 and 2.
Figure 1 schematically shows a wind turbine 1. The wind turbine 1 comprises a tower 2, a nacelle 3 and a hub 4. The nacelle 3 is located on top of the tower 2. The hub 4 comprises a number of wind turbine blades 5. The hub 4 is mounted to the nacelle 3. Moreover, the hub 4 is pivot -mounted such that it is able to rotate about a rotation axis 9. A generator 6 is located inside the nacelle 3. The wind turbine 1 is a di- rect drive wind turbine .
Figure 2 schematically shows part of an inventive generator 6 in a perspective view. The generator 6 comprises a magnet assembly 11 and a base element 12. The magnet assembly 11 com- prises at least one magnet 13 and a mounting plate 14. The magnet 13 is connected to the mounting plate 14. For example, a permanent magnet 13 is glued onto the mounting plate 14. The mounting plate 14 is fastened to the base element 12 by spot -welding . The weld points are designated by reference nu- meral 15.
The magnet 13 can be a permanent magnet. Advantageously, a non-magnetized magnet 13 is used, which is magnetized after spot-welding the mounting plate 14 onto the base element 12. This avoids disturbing attractive magnetic forces between the elements. Moreover, the magnet 13 may be segmented. For example, a number of permanent magnets 13 may be glued onto one mounting plate 14. The base element 12 may be part of the rotor of the generator 6 or it may be connected to the rotor of the generator 6.
Furthermore, the magnet 13 can be covered by a protective cover. The protective cover may comprise stainless steel or a plastic material. The protective cover provides a protection of the magnet material against corrosion and other environmental influences.
Instead of spot-welds also braze-welds or hard- soldering is possible.
In summary, the present invention provides a simple and cost- effective generator, especially for a wind turbine, and a simple and cost ef fective method for mounting of permanent magnet assemblies to a generator rotor base .

Claims

Claims
1. A method for assembling part of a generator (6),
wherein a magnet assembly (11) comprising at least one magnet (13) and a mounting plate (14) is fastened to a base element (12) by welding (15) the mounting plate (14) to the base element (12) .
2. The method as claimed in claim 2,
wherein the magnet assembly (11) is positioned and maintained in the position before welding it to the base element (12) .
3. The method as claimed in claim 1 or 2 ,
wherein a non-magnetized magnet (13) is used and the non- magnetized magnet (13) is magnetised after welding the mounting plate (14) to the base element (12) .
4. The method as claimed in any of the claims 1 to 3 ,
wherein the mounting plate (14) is welded to the base element (12) by means of an industrial robot.
5. The method as claimed in any of the claims 1 to 4 ,
wherein the mounting plate (14) is fastened to the base element (12) by spot-welding (15) and/or braze-welding and/or hard-soldering the mounting plate (14) to the base element (12) .
6. A generator (6) comprising a magnet assembly (11) and a base element (12) , the magnet assembly (11) comprising at least one magnet (13) and a mounting plate (14) ,
wherein the mounting plate (14) is fastened to the base element (12) by means of a number of welds (15) .
7. The generator (6) as claimed in claim 6,
wherein the generator (6) comprises a rotor and the base element (12) is part of the rotor or is connected to the rotor.
8. The generator (6) as claimed in claim 6 or 7 , wherein the magnet assembly (11) comprises at least one permanent magnet (13) .
9. The generator (6) as claimed in any of the claims 6 to 8 , wherein the magnet (13) is segmented.
10. The generator (6) as claimed in any of the claims 7 to 9, wherein the magnet (13) is covered by a protective cover.
11. The generator (6) as claimed in claim 10,
wherein the protective cover comprises stainless steel or a plastic material .
12. The generator (6) as claimed in any of the claims 6 to 11,
wherein the generator (6) is a direct drive generator.
13. The generator (6) as claimed in any of the claims 6 to 12,
wherein the mounting plate (14) is fastened to the base element (12) by means of a number of spot -welds (15) and/or braze-welds and/or hard- soldering .
14. A wind turbine (1) comprising a generator (6) as claimed in any of the claims 6 to 13.
PCT/EP2010/000961 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine WO2011100987A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US13/578,001 US20130038070A1 (en) 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine
CA2789825A CA2789825A1 (en) 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine
JP2012553184A JP2013520149A (en) 2010-02-16 2010-02-16 Method for assembling a part of a generator, generator and windmill
BR112012020378A BR112012020378A2 (en) 2010-02-16 2010-02-16 Method of mounting part of a generator, generator and wind turbine
EP10716752A EP2526608A1 (en) 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine
CN201080064049.3A CN102754310B (en) 2010-02-16 2010-02-16 For assembling the method for generator part, generator and wind turbine
PCT/EP2010/000961 WO2011100987A1 (en) 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/000961 WO2011100987A1 (en) 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine

Publications (1)

Publication Number Publication Date
WO2011100987A1 true WO2011100987A1 (en) 2011-08-25

Family

ID=43828399

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/000961 WO2011100987A1 (en) 2010-02-16 2010-02-16 Method for assembling part of a generator, generator and wind turbine

Country Status (7)

Country Link
US (1) US20130038070A1 (en)
EP (1) EP2526608A1 (en)
JP (1) JP2013520149A (en)
CN (1) CN102754310B (en)
BR (1) BR112012020378A2 (en)
CA (1) CA2789825A1 (en)
WO (1) WO2011100987A1 (en)

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JP2013520149A (en) 2013-05-30
BR112012020378A2 (en) 2016-05-10
US20130038070A1 (en) 2013-02-14
EP2526608A1 (en) 2012-11-28
CN102754310B (en) 2015-09-16
CA2789825A1 (en) 2011-08-25
CN102754310A (en) 2012-10-24

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