WO2000028638A2 - Verfahren zur herstellung eines stators und/oder eines rotors, stator und rotor und elektrische maschine mit einem rotor und einem stator - Google Patents
Verfahren zur herstellung eines stators und/oder eines rotors, stator und rotor und elektrische maschine mit einem rotor und einem stator Download PDFInfo
- Publication number
- WO2000028638A2 WO2000028638A2 PCT/EP1999/005629 EP9905629W WO0028638A2 WO 2000028638 A2 WO2000028638 A2 WO 2000028638A2 EP 9905629 W EP9905629 W EP 9905629W WO 0028638 A2 WO0028638 A2 WO 0028638A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator
- rotor
- band
- segments
- teeth
- 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.)
- Ceased
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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- 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 invention relates to a method for producing a stator and / or a rotor, a stator and a rotor and an electrical machine with a rotor and a stator according to the preambles of the independent claims.
- stator sheets are stamped so that they have the intended number of stator teeth in the inner area. Then they are placed on top of one another in the direction of the stator axis and connected, so that a compact stator laminated core is produced.
- the stator teeth directed inwards to the central axis are wrapped with wire, so that each stator tooth or several stator teeth are then surrounded by a coil, the winding planes of which are aligned parallel to the stator axis.
- the assembly of the coils is very complex and difficult because of the complex shape of the stator. With coils with relatively large wire diameters and rigid wires, mechanical winding and mounting of the coils is hardly possible. Another problem is the introduction of electrical insulation between the coils and stator teeth and slot foot, since the inside of the stator is not freely accessible is. Likewise, the holding of already installed coils can be an assembly problem when inserting additional coils.
- a rotor and / or a stator is assembled in the circumferential direction from at least two segments or bent from a band.
- circular-arc-shaped segments are expedient. It is favorable to join the segments together by pushing and / or hooking them together.
- coil wire can be wound on at least one stator tooth before the band and / or the segments are shaped or assembled into a stator and thus a stator with a closed cross-sectional shape is formed.
- automatic winding of the coils is possible by coil wire is applied to the 'teeth of the elongate nor tape.
- stator teeth or rotor teeth are each formed in one piece with the band and / or the segments.
- the strip and / or the segments are each formed by a laminated core, the laminated core being composed by punched sheet metal disks placed one on top of the other in the direction of the motor axis.
- the laminated core being composed by punched sheet metal disks placed one on top of the other in the direction of the motor axis.
- stator teeth are wrapped with coil wire, the cross-sectional shape of the coil wire being changed during the wrapping. This allows an advantageous use of the space between the stator teeth.
- the outside diameter of the coil is changed such that the larger outside diameter of the coil is formed on the slot foot. This allows a further advantageous use of the space between the stator teeth.
- both the wire cross-section and the diameter of the coil can be changed.
- a preferred stator or rotor according to the invention has at least one butt seam in a plane perpendicular to its central axis.
- the butt seam can run as desired, in particular radial, curved, wavy or serrated.
- FIG. 2 shows a schematic diagram of a stator according to the invention in curved form
- FIG. 3 shows a basic illustration of a further method step according to the invention during molding
- FIG. 5 shows a schematic diagram of a further stator according to the invention before molding
- FIG. 7 shows a schematic representation of a top view of the end face of a rotor according to the invention after molding.
- the invention is suitable for electrical machines which have a stator and a rotor, such as asynchronous machines, reluctance machines and the like.
- the stator is designed as an elongated, flat band 6 with a first end 6.1 and a second end 6.2.
- the length of the band 6 in the circumferential direction of the stator can be less than the height of the stator.
- the band 6 has stator teeth 4 which are arranged on the same side of the band 6, while the back 6.3 of the band, which can later form the outer boundary of the stator, has no stator teeth.
- stator teeth 4 are freely accessible from the outside and can therefore be wrapped with coil wire 5 in a simple manner. This is possible, in particular, by machine and permits the production of stators of this type which are suitable for large series production. Any electrical insulation between stator 1 and coil wire 5, in particular slot base insulation, can now be fitted just as easily into the grooves 3 between the stator teeth 4.
- the coil wire 5 is indicated in cross section as a single-layer winding on a stator tooth 4.
- the band 6 is then formed into the stator. This can be done in two ways according to the invention. Either the band 6 is bent with a suitable tool and brought into a closed cross-sectional shape by connecting the first end 6.1 to the second end 6.2. This is indicated by arrows in the figure. Or the stator is assembled by segments in the circumferential direction until a closed stator is created by assembling one of the ends 6.1 or 6.2 of the band 6 with another end of another band, etc., as outlined in FIG. 4.
- the closed cross-sectional shape produced in this way preferably corresponds to the shape in which the stator with rotor and housing is assembled. The shape can be round or square and can still be edited if necessary.
- the curved band 6 is fixed in its final shape.
- the butt seam can be closed with a suitable joining process, in particular welded or glued.
- the stator is optionally placed in a housing (not shown).
- a stator 1 produced according to the invention is shown in FIG. 2.
- the stator 1 has an essentially round cross-sectional shape with a central axis 2.
- the butt seam can be designed differently, in particular be straight or curved or be provided with interlocking serrations in order to minimize the influence of any air gaps.
- teeth Z are formed on the inner circumference of the stator 1 on the outer circumference of the stator 1, only a few of which are designated by reference numerals for the sake of clarity.
- these are sealed by the housing on the contact surface after installation in a possible housing (not shown) and act as cooling channels.
- the design of the outer circumference of the stator 1 can be adapted to the particular application and the respective electrical machine for which the stator is intended.
- the band 6 and / or the stator teeth 4 can be made of solid material.
- a particularly preferred possibility consists in punching out sheet metal strips and stacking them in the direction of the stator axis.
- the band 6 is then assembled from sheets lined up in the axial direction 2 of the stator.
- the very special advantage here is that the manufacture of the stator according to the invention enables considerable material savings.
- stator sheets with a closed circumference are punched out, a considerable amount of material waste occurs, both from the inside of the stator and, in particular in the case of round stator sheets, from the outside.
- punching out elongated tapes which are then only bent or assembled into a closed circumference, the starting material can be better used because of the more favorable geometry of the strips and the amount of waste can be reduced. This also results in considerable cost savings in the manufacture of the stator
- notches 7 in the band 6 between the stator teeth are particularly expedient to provide 4 notches 7 in the band 6 between the stator teeth, as shown in FIG. 3.
- a band in an advantageous embodiment in the curved state outlined during bending. When the strip is bent, the material does not bulge at the notches 7 and it takes less force to bend a thick stack of sheets than without notches. Lugs 7.1 and depressions 7.2 are advantageously provided on the notches, which engage when they are brought together, and the band is held together by means of connecting webs 7.3.
- stator teeth 4 can then be wrapped with coil wire 5.
- coil wire can also be introduced only after the stator has been formed.
- the butt seam 9 can be produced using suitable joining methods, in particular welded or glued.
- segments 8 with stator teeth 4 are produced. This is shown in Figure 4.
- a single segment 8 preferably has at least one stator tooth 4.
- the freely accessible teeth 4 are wrapped with coil wire 5 (not shown).
- the segments 8 are joined together until a closed, in particular round, circumference of the stator 1 is formed and fixed in this form.
- segments in the shape of a circular arc are expedient.
- the segments 8 can already be punched out as a circular arc or also punched out as straight strips and bent before assembly or also after assembly.
- the seams 9 of the curved band 6 or the joined segments 8 can be connected, in particular glued or welded, using suitable joining techniques in order to minimize air gaps in the stator 1 as much as possible.
- the coil wire 5 is preferably made of a copper-containing and / or an aluminum-containing material.
- the joints or the seam 9 of the segments 8 or of the curved band 6 run in a plane which is arranged perpendicular to the central axis 2 of the stator.
- FIG. 5 A further possibility of improving the efficiency is shown in FIG. 5 and consists in that the coil wire is changed in its cross-sectional shape when it is wound up into the coil.
- wire cross sections with a modified cross section 5 and an unchanged cross section 5 are shown.
- a groove 3 is formed between the stator teeth 4, which the Pick up coil wires.
- the groove 3 often has a trapezoidal cross section and / or a rounded bottom.
- the material of the coil wire is to be introduced into this volume. The higher the fill factor, the higher the efficiency.
- the cross section of the wire is changed when winding a coil.
- the cross section is particularly preferably changed so that the coil wire adapts to the shape of the stator 1 on the slot foot. Essentially trapezoidal or triangular wire cross sections are also favorable. After winding, the entire coil can also be deformed.
- the coils with a deformed wire cross section can also be inserted in a conventionally manufactured stator 1 in the usual way, " which improves the efficiency of the motor because of the resulting increased fill factor.
- the deformed coil wire can also be advantageously applied to stator teeth 4 of an elongated stator band 6 or to stator tooth 4 of stator segments 8.
- Another favorable embodiment is to change the outside diameter of the coil, in particular the winding width along a stator tooth 4.
- the largest outside diameter of the coil is expediently located at the slot foot of the stator 1.
- FIG. 6 shows a basic illustration of two stamped strips 6 ', which form a rotor 1' after being formed.
- the bands can be very close together be punched out; the teeth 4 'interlock. This means that the waste of material during punching is considerably minimized compared to the punching of round geometries.
- FIG. 7 shows a top view of the end face of a rotor 1 'which was bent from a band 6' according to FIG. 6. After bending, the rotor 1 'has butt seams 9' which run in a plane perpendicular to the central axis 2.
- stator 1 or one rotor 1 'of the electrical machine from strips 6, 6' or segments 8, 8 'and to arrange them with a conventionally produced rotor or stator.
- Rotor 1 'and stator 1 can be designed both as an external rotor arrangement and as an internal rotor arrangement.
- the stator or rotor according to the invention is suitable for various electrical machines, in particular for a reluctance machine or an asynchronous machine.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99944329A EP1129517B1 (de) | 1998-11-09 | 1999-08-03 | Verfahren zur herstellung eines stators, stator und elektrische maschine mit diesem stator |
| DE59907894T DE59907894D1 (de) | 1998-11-09 | 1999-08-03 | Verfahren zur herstellung eines stators, stator und elektrische maschine mit diesem stator |
| PCT/EP1999/008540 WO2000028639A2 (de) | 1998-11-09 | 1999-11-08 | Band zur herstellung eines ringförmigen elektromagnetischen elements für eine elektrische maschine |
| DE59903118T DE59903118D1 (de) | 1998-11-09 | 1999-11-08 | Band zur herstellung eines ringförmigen elektromagnetischen elements für eine elektrische maschine |
| EP99959274A EP1129516B1 (de) | 1998-11-09 | 1999-11-08 | Band zur herstellung eines ringförmigen elektromagnetischen elements für eine elektrische maschine |
| US09/831,405 US6630766B1 (en) | 1998-11-09 | 1999-11-08 | Strip for producing a ring-shaped electromagnetic element for an electric motor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19851363.1 | 1998-11-09 | ||
| DE19851363A DE19851363A1 (de) | 1998-11-09 | 1998-11-09 | Verfahren zur Herstellung eines Stators für einen Elektromotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2000028638A2 true WO2000028638A2 (de) | 2000-05-18 |
| WO2000028638A3 WO2000028638A3 (de) | 2000-08-10 |
Family
ID=7887009
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1999/005629 Ceased WO2000028638A2 (de) | 1998-11-09 | 1999-08-03 | Verfahren zur herstellung eines stators und/oder eines rotors, stator und rotor und elektrische maschine mit einem rotor und einem stator |
| PCT/EP1999/008540 Ceased WO2000028639A2 (de) | 1998-11-09 | 1999-11-08 | Band zur herstellung eines ringförmigen elektromagnetischen elements für eine elektrische maschine |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1999/008540 Ceased WO2000028639A2 (de) | 1998-11-09 | 1999-11-08 | Band zur herstellung eines ringförmigen elektromagnetischen elements für eine elektrische maschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6630766B1 (de) |
| EP (2) | EP1129517B1 (de) |
| DE (3) | DE19851363A1 (de) |
| WO (2) | WO2000028638A2 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10112268A1 (de) * | 2001-03-14 | 2002-10-02 | Siemens Ag | Elektrische Maschine |
| DE10256735A1 (de) * | 2002-05-21 | 2003-12-04 | Continental Teves Ag & Co Ohg | Elektromotor, insbesondere zum Antrieb einer hydraulischen Pumpe für eine schlupfgeregelte Kraftfahrzeugbremsanlage |
| EP2381561A3 (de) * | 2004-09-20 | 2016-11-23 | Windfin B.V. | Windkraftanlage mit einem Generator |
Families Citing this family (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3871964B2 (ja) * | 2002-05-16 | 2007-01-24 | 三菱電機株式会社 | 回転電機の固定子鉄心の製造方法 |
| KR100452379B1 (ko) * | 2002-10-10 | 2004-10-12 | 엘지전자 주식회사 | 모터의 단위코어 및 그 제조방법 |
| DE10259090A1 (de) | 2002-12-17 | 2004-07-22 | Siemens Ag | Elektrische Maschine und Verfahren zur Herstellung einer elektrischen Maschine |
| US6975049B2 (en) * | 2003-10-29 | 2005-12-13 | A. O. Smith Corporation | Electrical machine and method of manufacturing the same |
| US6982532B2 (en) | 2003-12-08 | 2006-01-03 | A. O. Smith Corporation | Electric machine |
| JP2005312277A (ja) * | 2004-04-26 | 2005-11-04 | Denso Corp | 回転電機の集中巻き型ステータコイル |
| US7247967B2 (en) * | 2004-08-09 | 2007-07-24 | A. O. Smith Corporation | Electric motor having a stator |
| US7737598B2 (en) * | 2004-08-09 | 2010-06-15 | A. O. Smith Corporation | Electric motor having a stator |
| DE102005033673A1 (de) * | 2005-07-19 | 2007-01-04 | Minebea Co., Ltd. | Statoranordnung für eine elektrische Maschine |
| ATE486401T1 (de) * | 2005-09-21 | 2010-11-15 | Lcd Laser Cut Ag | Ringförmiges blechpaket aus einem elektromagnetischen blechband |
| DE102005051380A1 (de) * | 2005-10-27 | 2007-05-03 | Zf Friedrichshafen Ag | Stator einer E-Maschine |
| US7348706B2 (en) * | 2005-10-31 | 2008-03-25 | A. O. Smith Corporation | Stator assembly for an electric machine and method of manufacturing the same |
| US7777387B2 (en) * | 2007-04-27 | 2010-08-17 | Mitsui High-Tec, Inc. | Laminated core and method for manufacturing the same |
| CA2649120A1 (en) * | 2006-04-13 | 2007-10-25 | A.O. Smith Corporation | Electric machine, stator assembly for an electric machine, and method of manufacturing the same |
| KR101275210B1 (ko) * | 2006-06-16 | 2013-06-18 | 엘지전자 주식회사 | 와인딩 타입 스테이터 코어를 갖는 스테이터 및 이를포함한 세탁장치 |
| JP4176121B2 (ja) * | 2006-10-13 | 2008-11-05 | 株式会社三井ハイテック | 回転子積層鉄心およびその製造方法 |
| WO2008154495A2 (en) * | 2007-06-08 | 2008-12-18 | A.O. Smith Corporation | Electric motor, stator for an electric motor and method of manufacturing same |
| DE102007032872A1 (de) * | 2007-07-12 | 2009-01-15 | Ipgate Ag | Stator für Elektromotor |
| WO2009031204A1 (ja) * | 2007-09-04 | 2009-03-12 | Mitsui High-Tec, Inc. | 積層鉄心及びその製造方法 |
| JP5469307B2 (ja) * | 2008-01-23 | 2014-04-16 | 株式会社三井ハイテック | 回転子積層鉄心 |
| JP4445023B2 (ja) * | 2008-04-18 | 2010-04-07 | 株式会社日本自動車部品総合研究所 | 回転電機の固定子及び回転電機 |
| JP4948474B2 (ja) * | 2008-05-16 | 2012-06-06 | 株式会社富士通ゼネラル | 電動機 |
| JP5620126B2 (ja) * | 2009-05-15 | 2014-11-05 | 株式会社三井ハイテック | 積層鉄心 |
| JP5597259B2 (ja) * | 2010-09-22 | 2014-10-01 | 三菱電機株式会社 | 回転電機の製造方法 |
| JP5903545B2 (ja) * | 2011-01-24 | 2016-04-13 | パナソニックIpマネジメント株式会社 | コア素材、ステータコアおよびこのステータコアを備えたモータ |
| US9099897B2 (en) | 2011-09-13 | 2015-08-04 | L.H. Carbide Corporation | Method for connecting end sections of an annular laminated article and articles made therefrom |
| US8941274B2 (en) | 2012-03-23 | 2015-01-27 | Whirlpool Corporation | Stator for an electric motor of a washing machine and method of manufacturing the same |
| CN102710034B (zh) * | 2012-05-11 | 2014-12-10 | 锦州汉拿电机有限公司 | 外径可调式电机内定子及其制造方法 |
| KR101679470B1 (ko) * | 2014-05-16 | 2016-11-25 | 뉴모텍(주) | 모터의 적층 코어 및 제조 방법 |
| FR3072517B1 (fr) * | 2017-10-17 | 2020-12-18 | Moving Magnet Tech | Machine electrique toroidale polyphasee |
| JP7705237B2 (ja) * | 2020-11-20 | 2025-07-09 | ミネベアミツミ株式会社 | モータ |
| GB2610874A (en) * | 2021-09-21 | 2023-03-22 | Electrified Automation Ltd | Stator assembly method |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341321B1 (de) | 1971-07-30 | 1978-11-02 | ||
| DE2629532A1 (de) * | 1975-07-03 | 1977-01-27 | Sev Alternateurs | Verfahren und vorrichtung fuer einen stator oder rotor einer elektrischen rotationsmaschine |
| DE2817660A1 (de) * | 1978-04-21 | 1979-10-31 | Kulikov | Verfahren und vorrichtung zur herstellung gewundener magnetleiter fuer elektrische maschinen |
| US4712292A (en) * | 1984-10-12 | 1987-12-15 | General Electric Company | Method of assembling a stationary assembly for a dynamoelectric machine |
| US4654552A (en) * | 1985-03-28 | 1987-03-31 | General Electric Company | Lanced strip and edgewise wound core |
| FR2631755A1 (fr) * | 1988-03-02 | 1989-11-24 | Emiliane Trancerie Spa | Procede pour la realisation d'un circuit magnetique de stator de machines electriques rotatives ou d'un circuit magnetique de transformateurs, et circuit magnetique ainsi obtenu |
| US5256926A (en) * | 1989-08-01 | 1993-10-26 | Robert Bosch Gmbh | Alternating-current generator with stator center lamination and method for producing the center lamination |
| JP2888142B2 (ja) * | 1993-11-08 | 1999-05-10 | 三菱電機株式会社 | 回転電動機並びにその製造方法 |
| US5382859A (en) * | 1992-09-01 | 1995-01-17 | Unique Mobility | Stator and method of constructing same for high power density electric motors and generators |
| JP3355700B2 (ja) * | 1993-06-14 | 2002-12-09 | 松下電器産業株式会社 | 回転電機の固定子 |
| JP3501236B2 (ja) * | 1994-03-25 | 2004-03-02 | 株式会社安川電機 | 回転電機の巻線方法 |
| DE19633399A1 (de) * | 1996-08-19 | 1998-02-26 | Siemens Ag | Ein den Ständer einer elektrischen Maschine bildender Eisenkern |
| DE19643561C1 (de) * | 1996-10-22 | 1998-01-15 | Wolfgang Hill | Elektrische Maschine mit einer Einzelpolwicklung |
| JPH10322943A (ja) * | 1997-05-21 | 1998-12-04 | Shibaura Eng Works Co Ltd | モータの固定子 |
| JPH10327545A (ja) * | 1997-05-23 | 1998-12-08 | Toshiba Corp | 回転電機のステータ |
| JPH11215745A (ja) * | 1998-01-20 | 1999-08-06 | Shibaura Mechatronics Corp | 電動モータ及びステータコアの形成方法 |
-
1998
- 1998-11-09 DE DE19851363A patent/DE19851363A1/de not_active Withdrawn
-
1999
- 1999-08-03 WO PCT/EP1999/005629 patent/WO2000028638A2/de not_active Ceased
- 1999-08-03 EP EP99944329A patent/EP1129517B1/de not_active Expired - Lifetime
- 1999-08-03 DE DE59907894T patent/DE59907894D1/de not_active Expired - Lifetime
- 1999-11-08 WO PCT/EP1999/008540 patent/WO2000028639A2/de not_active Ceased
- 1999-11-08 US US09/831,405 patent/US6630766B1/en not_active Expired - Fee Related
- 1999-11-08 DE DE59903118T patent/DE59903118D1/de not_active Expired - Lifetime
- 1999-11-08 EP EP99959274A patent/EP1129516B1/de not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10112268A1 (de) * | 2001-03-14 | 2002-10-02 | Siemens Ag | Elektrische Maschine |
| DE10256735A1 (de) * | 2002-05-21 | 2003-12-04 | Continental Teves Ag & Co Ohg | Elektromotor, insbesondere zum Antrieb einer hydraulischen Pumpe für eine schlupfgeregelte Kraftfahrzeugbremsanlage |
| EP2381561A3 (de) * | 2004-09-20 | 2016-11-23 | Windfin B.V. | Windkraftanlage mit einem Generator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000028639A2 (de) | 2000-05-18 |
| EP1129517B1 (de) | 2003-11-26 |
| DE59907894D1 (de) | 2004-01-08 |
| DE19851363A1 (de) | 2000-05-18 |
| WO2000028638A3 (de) | 2000-08-10 |
| EP1129516A2 (de) | 2001-09-05 |
| US6630766B1 (en) | 2003-10-07 |
| EP1129517A2 (de) | 2001-09-05 |
| EP1129516B1 (de) | 2002-10-16 |
| WO2000028639A3 (de) | 2000-07-27 |
| DE59903118D1 (de) | 2002-11-21 |
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