US20090235516A1 - Method of Servicing a Power Generator - Google Patents

Method of Servicing a Power Generator Download PDF

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Publication number
US20090235516A1
US20090235516A1 US12/352,732 US35273209A US2009235516A1 US 20090235516 A1 US20090235516 A1 US 20090235516A1 US 35273209 A US35273209 A US 35273209A US 2009235516 A1 US2009235516 A1 US 2009235516A1
Authority
US
United States
Prior art keywords
keybars
stator core
stator
frame
support structure
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US12/352,732
Other languages
English (en)
Inventor
Craig P. Notarange
David T. Allen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Inc
Original Assignee
Siemens Energy Inc
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 Energy Inc filed Critical Siemens Energy Inc
Priority to US12/352,732 priority Critical patent/US20090235516A1/en
Assigned to SIEMENS ENERGY, INC. reassignment SIEMENS ENERGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLEN, DAVID T., NOTARANGE, CRAIG P.
Priority to CN2009801094944A priority patent/CN101978581B/zh
Priority to PCT/US2009/001709 priority patent/WO2009117107A2/en
Priority to KR1020107023375A priority patent/KR101605412B1/ko
Priority to EP09722651.8A priority patent/EP2269284B1/en
Publication of US20090235516A1 publication Critical patent/US20090235516A1/en
Priority to US14/863,791 priority patent/US9627950B2/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/06—Embedding prefabricated windings in machines
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/0006—Disassembling, repairing or modifying dynamo-electric machines
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine

Definitions

  • the present invention relates to power generators, and more particularly, to a method of servicing stator frames in power generators.
  • U.S. Pat. No. 5,875,540 discloses a process for forming a stator core in a stator frame.
  • the process involves forming a plurality of core modules or donuts, each of which comprises a plurality of stator core rings laminated together.
  • the stator frame is placed in an upright position.
  • a predefined number of the core modules are then lowered into the upright stator frame.
  • U.S. Pat. Nos. 7,302,754; 7,353,586; and 7,395,594, the entire disclosures of which are incorporated by reference herein, are directed at installing stator cores into stator frames without placing the stator frame in an upright position.
  • U.S. Pat. No. 7,202,587 the entire disclosure of which is also incorporated by reference herein, discloses mounting stator core donuts having enlarged grooves in a stator frame using wedges that disperse forces to the donuts in a circumferential manner. The enlarged grooves make installing the donuts less difficult, while the wedges ensure a tight fit of the laminations within the stator frame.
  • FIG. 1 illustrates a known stator frame 10 for a power generator.
  • the stator frame 10 comprises a main housing 11 for supporting a stator core, not shown in FIG. 1 .
  • the main housing 11 comprises an outer structure 13 and a main support structure 15 coupled to the outer structure 13 .
  • the main support structure 15 comprising a plurality of stator bore or support rings 18 coupled to the outer structure 13 and a plurality of frame beams 16 coupled to the stator bore rings 18 .
  • the main housing 11 further comprises a plurality of dove-tail shaped building bolts or keybars 12 coupled to the frame beams 16 .
  • the stator core not shown in FIG. 1 , is supported in the stator frame 10 via the keybars 12 .
  • FIG. 2 illustrates a stator core lamination or donut 14 comprising a plurality of stator core rings (also referred to as laminations) laminated or otherwise coupled together and configured to be supported on the keybars 12 illustrated in FIG. 1 . It is noted that a plurality of the stator core donuts 14 are stacked together within the stator frame 10 to form the stator core.
  • each stator core donut 14 includes a plurality of slots or grooves 20 (see FIG. 3 ) along its outer periphery to receive the keybars 12 .
  • the grooves 20 have a dove-tail shape corresponding to the shape of the keybars 12 to ensure a secure and tight fit within the stator frame 10 , as more clearly shown in FIG.
  • each stator core donut 14 has small radial gaps 21 . It is noted that small radial gaps 21 are formed between the periphery of each stator core donut 14 and the inner diameter of the support rings 18 , as shown in FIG. 2 . It is also noted that one or more mounting assist structures 23 A, 23 B, 23 C may be disposed in each groove 20 between the stator core donut 14 and the corresponding keybar 12 . The mounting assist structures 23 A, 23 B, 23 C assist in securing a tight fit between the stator core donut 14 and the keybars 12 .
  • a method of servicing a stator frame of a power generator comprises removing a first stator core from a main housing of the stator frame, removing a plurality of first dove-tail shaped keybars that extend axially within and are coupled to a main support structure forming part of the main housing, and installing a plurality of second keybars in the main support structure.
  • the second keybars are adapted to support a second stator core.
  • Each of the second keybars has a generally rounded engagement surface and the second stator core includes recesses with shapes corresponding to the generally rounded engagement surfaces of the second keybars such that the second stator core can be securely supported by the main support structure via the second keybars.
  • the main support structure may comprise a plurality of stator bore rings and a plurality of frame beams, wherein the second keybars are coupled to the frame beams.
  • Installing a plurality of second keybars in the main support structure may comprise bolting the second keybars to the frame beams.
  • Bolting the second keybars to the frame beams may comprise installing bolts into counter-bored holes until end portions of the bolts are inserted past a radially inner surface of the second keybars.
  • the method may further comprise installing the second stator core onto the second keybars.
  • the method may further comprise servicing the frame beams such that the second stator core can be more easily axially slid onto the second keybars without the second stator core contacting the frame beams.
  • servicing the frame beams may comprise removing radially inner corner edges of the frame beams to create a radial clearance for a radial outer edge of the second stator core.
  • a portable milling machine may be utilized to remove the radially inner corner edges of the frame beams.
  • a kit for servicing a stator frame of a power generator wherein the stator frame includes dove-tail keybars installed therein supporting a first stator core within a main support structure of a main housing.
  • the kit comprises a plurality of second keybars and fasteners to couple the second keybars to the main support structure of the main housing.
  • Each of the second keybars has a generally rounded engagement surface and is adapted to replace the dove-tail shaped keybars installed in the main support structure.
  • the second keybars are adapted to support a second stator core in the main support structure.
  • the second stator core includes recesses with shapes corresponding to the generally rounded engagement surfaces of the second keybars.
  • the main support structure may comprise a plurality of stator bore rings and a plurality of frame beams, wherein the second keybars are coupled to the frame beams with the fasteners.
  • the fasteners may comprise bolts, which may be installed through counter-bored holes in the second keybars.
  • End portions of the second keybars may extend further radially inwardly than a radial end of the bolts.
  • the kit may further comprise a portable milling machine for removing radially inner corner edges of the frame beams to create a radial clearance for a radial outer edge of the second stator core.
  • FIG. 1 is a cut-away perspective view of a prior art generator frame including an annular array of dove-tail shaped keybars;
  • FIG. 2 is a cross sectional view of an inner portion of the prior art generator frame illustrated in FIG. 1 and further including a prior art stator core donut;
  • FIG. 3 is an enlarged cross sectional view of a portion of the prior art generator frame and a portion of the stator core donut illustrated in FIG. 2 ;
  • FIG. 4 is a cross sectional view of a portion of a generator frame including a replacement donut after the generator frame has been serviced according to embodiments of the invention
  • FIG. 5 is an enlarged cross sectional view of a portion of the replacement donut illustrated in FIG. 4 and a replacement keybar installed in the generator frame illustrated in FIG. 4 during the servicing thereof;
  • FIG. 6 is an exploded perspective view of a portion of the replacement keybar illustrated in FIG. 5 .
  • U.S. Pat. Nos. 7,302,754; 7,353,586; and 7,395,594 are directed at installing stator cores into stator frames without placing the stator frame in an upright position.
  • the systems, structures, and methods disclosed by these patents are utilized with keybars having rounded engagement surfaces, i.e., the keybars are generally rounded in shape. This is because replacement of a stator core onto rounded keybars using a horizontal replacement process is believed to be easier and more efficient as compared to replacement of a stator core onto dove-tail shaped keybars.
  • a power generator stator frame 10 may comprise a main housing 11 for supporting a stator core, not shown in FIG. 1 .
  • the main housing 11 comprises an outer structure 13 and a main support structure 15 coupled to the outer structure 13 .
  • the main support structure 15 comprising a plurality of stator bore rings 18 fixedly coupled to the outer structure 13 and a plurality of frame beams 16 fixedly coupled to the stator bore rings 18 .
  • the main housing 11 further comprises a plurality of building bolts or keybars 12 , which are dove-tail shaped in FIG. 1 , and coupled to the frame beams 16 .
  • the stator core, not shown in FIG. 1 is supported in the stator frame 10 via the keybars 12 .
  • the dove-tail shaped keybars 12 are then removed and replaced with generally rounded or cylindrical-shaped keybars followed by the installation of a new stator core onto the rounded keybars.
  • Donuts 14 mounted on dove-tail shaped keybars 12 are removed according to any traditional method(s) for removing such a stator core from a corresponding stator frame.
  • the stator core donuts 14 may be individually removed one by one by axially sliding the stator core donuts 14 along the dove-tail shaped keybars 12 until all stator core donuts 14 are removed from the stator frame 10 .
  • donuts 14 comprise two or more stator core rings laminated together. Instead of using donuts 14 in the present invention, individual stator core rings or laminations may be used instead.
  • the dove-tail shaped keybars 12 are removed from the frame beams 16 by removing fasteners 22 , such as bolts, extending through counter-bored holes 24 (see FIG. 3 ) formed in the keybars 12 and through corresponding holes 25 formed in the frame beams 16 . Removing the fasteners 22 frees each keybar 12 from its respective frame beam 16 .
  • one or more of the frame beams 16 are serviced by removing radially inner corner edges 16 A 1 , 16 B 1 (see FIG. 3 ) of the frame beams 16 , such that the modified frame beams 16 ′ comprise beveled radially inner corner edges 16 A 2 , 16 B 2 (see FIG. 5 ).
  • the beveled radially inner corner edges 16 A 2 , 16 B 2 provide an amount of radial clearance between the frame beams 16 ′ and a radial outer edge 30 A of each of the replacement donuts 30 .
  • the beveled radially inner corner edges 16 A 2 , 16 B 2 may be formed in the frame beams 16 ′, for example, by grinding the radially inner corner edges 16 A 1 , 16 B 1 using a portable milling machine (not shown), such as, for example, a TKF1500-0 model adjustable angle beveller manufactured by Trumpf Inc. of Farmington, Conn.
  • a portable milling machine such as, for example, a TKF1500-0 model adjustable angle beveller manufactured by Trumpf Inc. of Farmington, Conn.
  • Replacement building bolts or keybars 32 are then installed on the frame beams 16 ′ in generally the same locations as the previously removed keybars 12 .
  • the replacement keybars 32 are generally rounded in shape and comprise a generally rounded engagement surface 34 instead of the dove-tail shape of the removed keybars 12 .
  • the replacement keybars 32 include counter-bored holes 36 formed therein, as shown in FIGS. 5 and 6 , which counter-bored holes 36 may be substantially aligned with the holes 25 formed in the frame beams 16 ′, although it is understood that new holes (not shown) may be formed in the frame beams 16 ′ and aligned with the counter-bored holes 36 in the replacement keybars 32 if desired.
  • Fasteners 38 depicted in FIGS. 5 and 6 as bolts, are then inserted into the counter-bored holes 36 in the replacement keybars 32 and threaded into the corresponding holes 25 in the frame beams 16 ′ to secure the replacement keybars 32 to the frame beams 16 ′.
  • the fasteners 38 may be inserted into the counter-bored holes 36 until a radially inner surface 32 A of the corresponding replacement keybar 32 extends further radially inwardly than an end portion 38 A of each of the fasteners 38 , i.e., until the fasteners 38 are not extending out past the radially inner surfaces 32 A of the replacement keybars 32 .
  • the replacement donuts 30 can be axially slid on the replacement keybars 32 without contacting the fasteners 38 .
  • the replacement donuts 30 include grooves 50 .
  • Each replacement donut 30 is positioned relative to the stator frame 10 such that each groove 50 is aligned with a corresponding replacement keybar 32 . Thereafter, the replacement donut 30 is horizontal moved into the stator frame such that the replacement keybars 32 are received in a corresponding one of the grooves 50 in the replacement donut 30 .
  • the replacement donuts 30 may be installed into the stator frame using the structures and methods set out in U.S. Pat. Nos. 7,302,754, 7,353,586, and 7,395,594. Alternatively, any other suitable structures and methods can be used to install the replacement donuts 30 into the stator frame 10 . A plurality of donuts 30 are installed in this fashion until a predetermined number have been installed so as to define a replacement stator core.
  • first and second wedge structure assemblies 54 and 56 are provided in each groove 50 between the donut 30 and the corresponding keybar 32 , see FIG. 5 .
  • Each of the first and second wedge structure assemblies 54 , 56 in the embodiment shown comprises a filler member 54 A, 56 A, and first and second wedges 54 B, 54 C and 56 B, 56 C.
  • six donuts 30 are set in position.
  • first and second wedges 54 B, 54 C and 56 B, 56 C and filler members 54 A, 56 A are installed.
  • the first and second wedge structure assemblies 54 and 56 are utilized to aid in mounting the replacement donuts 30 on the replacement keybars 32 and to secure a tight fit between the replacement donuts 30 and the replacement keybars 32 . It is understood that other types of mounting assist structures may be used as desired.
  • replacing the dove-tail shaped keybars 12 with the replacement keybars 32 facilitates an easier replacement of a stator core within the stator frame 10 .
  • tooling, methods, and structure have been developed to replace stator cores within stator frames using horizontal processes and cylindrical-shaped keybars, these developed tooling, methods, and structure can be utilized in the stator frames 10 once the replacement keybars 32 are installed.
  • the use of the replacement donuts 30 and the first and second wedge structure assemblies 54 , 56 with the replacement cylindrical-shaped keybars 32 avoids developing new tooling, methods, and structure that would be required to use a horizontal process to replace a stator core in a stator frame that includes dove-tail shaped keybars.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Frames (AREA)
US12/352,732 2008-03-19 2009-01-13 Method of Servicing a Power Generator Abandoned US20090235516A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US12/352,732 US20090235516A1 (en) 2008-03-19 2009-01-13 Method of Servicing a Power Generator
CN2009801094944A CN101978581B (zh) 2008-03-19 2009-03-18 维修发电机的方法
PCT/US2009/001709 WO2009117107A2 (en) 2008-03-19 2009-03-18 Method of servicing a power generator
KR1020107023375A KR101605412B1 (ko) 2008-03-19 2009-03-18 발전기를 수리하는 방법
EP09722651.8A EP2269284B1 (en) 2008-03-19 2009-03-18 Method of servicing a power generator
US14/863,791 US9627950B2 (en) 2008-03-19 2015-09-24 Method of servicing a power generator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3788708P 2008-03-19 2008-03-19
US12/352,732 US20090235516A1 (en) 2008-03-19 2009-01-13 Method of Servicing a Power Generator

Related Child Applications (1)

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US14/863,791 Continuation US9627950B2 (en) 2008-03-19 2015-09-24 Method of servicing a power generator

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US20090235516A1 true US20090235516A1 (en) 2009-09-24

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US12/352,732 Abandoned US20090235516A1 (en) 2008-03-19 2009-01-13 Method of Servicing a Power Generator
US14/863,791 Active US9627950B2 (en) 2008-03-19 2015-09-24 Method of servicing a power generator

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US14/863,791 Active US9627950B2 (en) 2008-03-19 2015-09-24 Method of servicing a power generator

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EP (1) EP2269284B1 (ko)
KR (1) KR101605412B1 (ko)
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WO (1) WO2009117107A2 (ko)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013170148A2 (en) 2012-05-11 2013-11-14 Siemens Energy, Inc. Method of servicing a stator frame that uses spring assemblies to support a stator core
US8714534B2 (en) 2012-05-11 2014-05-06 Siemens Energy, Inc. Support assembly for servicing a stator frame that uses spring assemblies to support a stator core
US20140230216A1 (en) * 2013-02-15 2014-08-21 Travis John Vitello Method and apparatus for generator stator core separation
JP2015119633A (ja) * 2013-12-18 2015-06-25 シーメンス エナジー インコーポレイテッド ドーナツ型のステータコアフレームの取付け技術
US9083220B2 (en) 2013-07-29 2015-07-14 General Electric Company Method for servicing generator rotor in-situ
US9093886B2 (en) 2013-07-29 2015-07-28 General Electric Company System and method for rebalancing generator rotor in-situ
US9143022B2 (en) 2013-07-29 2015-09-22 General Electric Company System and method for rebalancing generator rotor in-situ
US9334850B2 (en) 2013-09-05 2016-05-10 General Electric Company System and method for centering wye ring in-situ
US9825511B2 (en) 2012-03-20 2017-11-21 General Electric Technology Gmbh Method for repairing a stator
US10107256B2 (en) 2013-09-05 2018-10-23 General Electric Company System for centering wye ring in-situ
WO2020092665A1 (en) * 2018-11-02 2020-05-07 Siemens Energy, Inc. Generator donut core insulated attachment

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN103001341A (zh) * 2012-11-19 2013-03-27 腾达电动科技镇江有限公司 盘式电机铁芯固定结构
US20140190001A1 (en) * 2013-01-04 2014-07-10 Michael P. Jaszcar Rail system for installing a stator core in a frame
EP3352334A1 (de) * 2017-01-18 2018-07-25 Siemens Aktiengesellschaft Tragstruktur eines blechpakets eines statorsegments

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US20080042514A1 (en) * 2006-08-17 2008-02-21 Siemens Power Generation, Inc. Power generator stator assembly, a stator core module assembly, and a process for assembling a stator core module assembly within a stator frame

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9825511B2 (en) 2012-03-20 2017-11-21 General Electric Technology Gmbh Method for repairing a stator
JP2015519862A (ja) * 2012-05-11 2015-07-09 シーメンス エナジー インコーポレイテッド バネ組立体を使用してステータコアを支持するステータフレームを補修するための支持組立体
US8714534B2 (en) 2012-05-11 2014-05-06 Siemens Energy, Inc. Support assembly for servicing a stator frame that uses spring assemblies to support a stator core
US8813333B2 (en) 2012-05-11 2014-08-26 Siemens Energy, Inc. Method of servicing a stator frame that uses spring assemblies to support a stator core
WO2013170148A2 (en) 2012-05-11 2013-11-14 Siemens Energy, Inc. Method of servicing a stator frame that uses spring assemblies to support a stator core
US9257873B2 (en) * 2013-02-15 2016-02-09 Siemens Energy, Inc. Method and apparatus for generator stator core separation
US20140230216A1 (en) * 2013-02-15 2014-08-21 Travis John Vitello Method and apparatus for generator stator core separation
US9083220B2 (en) 2013-07-29 2015-07-14 General Electric Company Method for servicing generator rotor in-situ
US9093886B2 (en) 2013-07-29 2015-07-28 General Electric Company System and method for rebalancing generator rotor in-situ
US9143022B2 (en) 2013-07-29 2015-09-22 General Electric Company System and method for rebalancing generator rotor in-situ
US9334850B2 (en) 2013-09-05 2016-05-10 General Electric Company System and method for centering wye ring in-situ
US10107256B2 (en) 2013-09-05 2018-10-23 General Electric Company System for centering wye ring in-situ
JP2015119633A (ja) * 2013-12-18 2015-06-25 シーメンス エナジー インコーポレイテッド ドーナツ型のステータコアフレームの取付け技術
EP2887500A3 (en) * 2013-12-18 2016-08-10 Siemens Energy, Inc. Donut stator core-frame attachment technique
WO2020092665A1 (en) * 2018-11-02 2020-05-07 Siemens Energy, Inc. Generator donut core insulated attachment

Also Published As

Publication number Publication date
WO2009117107A3 (en) 2009-11-12
KR101605412B1 (ko) 2016-03-22
EP2269284A2 (en) 2011-01-05
CN101978581B (zh) 2013-12-11
CN101978581A (zh) 2011-02-16
WO2009117107A2 (en) 2009-09-24
US20160013708A1 (en) 2016-01-14
US9627950B2 (en) 2017-04-18
EP2269284B1 (en) 2017-04-26
KR20110008183A (ko) 2011-01-26

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