US20080296289A1 - Movable heating system having fixed heating source for brazing stator bars - Google Patents
Movable heating system having fixed heating source for brazing stator bars Download PDFInfo
- Publication number
- US20080296289A1 US20080296289A1 US12/193,185 US19318508A US2008296289A1 US 20080296289 A1 US20080296289 A1 US 20080296289A1 US 19318508 A US19318508 A US 19318508A US 2008296289 A1 US2008296289 A1 US 2008296289A1
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- US
- United States
- Prior art keywords
- clip
- heating
- coil
- mass
- bar
- 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
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0004—Resistance soldering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/002—Soldering by means of induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/005—Soldering by means of radiant energy
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- 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
- H02K15/0056—Manufacturing winding connections
- H02K15/0068—Connecting winding sections; Forming leads; Connecting leads to terminals
- H02K15/0081—Connecting winding sections; Forming leads; Connecting leads to terminals for form-wound windings
- H02K15/0093—Manufacturing or repairing cooling fluid boxes, i.e. terminals of fluid cooled windings ensuring both electrical and fluid connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/38—Conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- 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
Abstract
A heating system for brazing a stator bar to a clip including: a heating coil having a seat to receive the stator bar and clip; a heating mass adapted to fit into the seat of the coil, and an extendible press applying the mass to the stator bar or clip.
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/628,931, filed in the U.S. Patent and Trademark Office (USPTO) on Nov. 19, 2004, and is a divisional application of U.S. patent application Ser. No. 11/195,590, filed in the USPTO on Aug. 3, 2005, the entirety of these applications are incorporated by reference herein.
- The present invention relates to brazing the ends of large stator bars that are used in power and industrial generators, positioning these bars in a brazing station, and fitting header clips to the bars during assembly.
- Stator bars are typically large, long and heavy, e.g., 35 feet long and hundreds of pounds (lbs.). The bars are generally straight and extend the length of a stator. When seated in a stator, the straight sections of the stator bars form a cylindrical array around a rotor. The ends of the stator bars extend axially from opposite ends of the stator. The end portion of the stator bars extend from the stator and are curved to form end turns. The ends of stator bars are connected through copper or stainless steel fittings and water-cooled connections to form continuous hydraulic winding circuits.
- Each water-cooled stator bar comprises an array of small rectangular solid and hollow copper strands. The array of copper strands in each bar are generally arranged in a rectangular bundle. The hollow strands each have an internal duct for conducting coolant through the bar. The ends of the bars are each connected to a hydraulic header clip.
- The hydraulic header clip serves as an electrical and a cooling flow connection for the armature winding bar. The hydraulic header clip is a hollow connector that includes an enclosed chamber for ingress or egress of a cooling liquid, typically deionized water. At one open end, the clip encloses the ends of the copper strands of the armature winding bar. A braze alloy bonds the end sections of the strands to each other and to the hydraulic header clip. The ends of the solid and hollow strands are brazed to a hydraulic header clip fitted to the end of the stator bar.
- The stator bar end and clip assembly must be heated to melt the braze alloy and braze the assembly together. A system and method is needed for applying heat to the clip and stator bar end assembly during the brazing process.
- A method has been developed to heat a metal assembly in a brazing chamber comprising: placing the assembly in the brazing chamber, wherein the assembly is seated in a heating coil; positioning a conductive mass between a press and the assembly; applying the press to the assembly while the assembly is seated in the coil; heating the assembly and the mass by applying energy to the coil; brazing the assembly with the heat from the coil, and removing the press and cooling the brazed assembly. The assembly may include a stator bar end, e.g., stator strands, and a clip.
- The method may further comprise heating coil includes a U-shaped section and the stator bar end seats in the U-shaped section, wherein the conductive mass seats in the U-shaped section and substantially fills an area defined by an entrance to the U-shaped section. Further, the conductive mass seats in the coil when abutting the stator bar and clip.
- The method may also be heating a stator bar and clip assembly in a brazing chamber comprising: placing the stator bar and clip assembly in the brazing chamber, wherein the assembly is seated in a U-shaped section of the heating coil; seating a heating mass in the U-shaped section between a ram and the assembly; extending the ram to press the heating mass against the assembly in the coil, wherein the mass fits into the U-shaped section; heating the stator bar and clip by applying energy to the coil; brazing the stator bar to the clip with the heat from the coil, and removing the press and cooling the brazed clip.
- A heating system has been developed for brazing a stator bar to a clip comprising: a heating coil having a seat to receive the stator bar and clip; a heating mass adapted to fit into the seat of the coil, and an extendible press applying the mass to the stator bar or clip. The seat may be a U-shaped section of the coil and the mass substantially fills an area defined by an entrance to the seat of the coil.
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FIG. 1 is a schematic illustration of a liquid-cooled stator winding arrangement illustrating the stator, stator bars and hydraulic header clips coupled to inlet and outlet coolant headers. -
FIG. 2 is a perspective view of the end of an armature winding bar showing the tiered rows of hollow and solid strands, and interleaving sheets of braze material. -
FIG. 3 is a perspective exploded view of the end of an armature winding bar inserted into a hydraulic header clip, with braze material and a clip cover shown to the side of the clip. -
FIG. 4 is an end view of the strands of an armature winding bar within a hydraulic header end clip with a ram clamping the cover to the clip and a heat sink attached to the bar. -
FIG. 5 is a side view of the winding bar, end clip and ram shown in a cross-section taken along line 5-5 inFIG. 4 . -
FIG. 6 is a perspective side view of a brazing chamber. -
FIG. 7 is an enlarged view of the interior of the brazing chamber that shows an induction heating coil and armature winding bar heat sink. -
FIG. 1 illustrates a liquid-cooled stator bar arrangement for a stator in a typical liquid-cooled generator. Astator core 10 hasstator core flanges 12 andcore ribs 14. Stator bars 16 (also referred to as armature winding bars) pass through radially extending slots in the stator core and are capped at opposite ends byhydraulic header clips 18 fitted to the ends of the bars. Copper orstainless steel fittings 20 connect adjacent ends of the stator bar pairs to form the complete armature coil.Inlet hoses 22 connect aninlet clip 18 to aninlet coolant header 24.Outlet hoses 26 connect anoutlet clip 18 to anoutlet coolant header 28. Each stator bar forms a half an armature coil. A pair of stator bars linked at their opposite ends form a complete armature coil. -
FIG. 2 is a perspective end view of anstator bar 16 without a hydraulic header clip. The bar is a rectangular array of solid 34 and hollow 36 copper strands.FIG. 3 is a perspective view of the end of anarmature winding bar 16 inserted in aclip 18 withbraze strips 30 and abraze sheet 50. Aclip cover 32 is shown to the side of theclip 18. InFIG. 2 , thebraze strips 30 are interleaved between tiered rows of solid thecopper strands 34 and rows ofhollow strands 36 of thebar 16. Just prior to brazing and at the end of the stator bar, braze strips are inserted between thestrands braze sheets 50 andclip 32 are assembled in theclip 18. - As shown in
FIG. 2 , the pre-braze positioned braze alloy strips extend beyond the ends of the short solid strands. The height of the alloy pre-positioned before brazing is selected so that the braze alloy will entirely melt during the braze process and not flow into the open ends of the extended hollow strands. - The hydraulic header clip 18 (also referred to as a stator bar clip) is formed of an electrically conductive material, such as copper. The
clip 18 is hollow and includes arectangular collar 38 that slides over the outer side surfaces of the end of thearmature winding bar 16. A rectangular slot 39 in the collar receives the end of the armature winding bar and interleavedstrips 30 of the braze alloy. Aclip cover 32 fits into the matching rectangular slot 39 in the side of thecollar 38.Sheets 50 of braze alloy are arranged around the inside surface of the collar and surrounding the end of the bar. At the other end of theclip 18 is acylindrical coupling end 40 that is configured to connect to the coolant circuit. - During brazing, the stator bar is held in a vertical position. When the stator bar is vertical the planer end of the bar is horizontal. An
end clip 18 is fitted to the end of the stator bar and brazematerial braze alloy material - During brazing, the
induction heating coil 66 heats the assembly of the clip, strand and brazestrips 30 andsheets 50. Theheating coil 66 heats the clip and end of the stator bar to braze them together. Aheating mass 57 may be placed between the end of theram 54 and theclip cover 32. Theheating mass 57 may be formed a thermally conductive material, such as steel or copper. Theheating mass 57 is heated by theheating coil 66 and conducts heat to the clip cover. The heating mass may have an inverted “C” shape in cross-section to fit the end of the ram and fit into the “C” shapedheating coil 66. The heating mass slides between the legs of the heating coil without touching the coil. The heating mass may also have a slot on its front face to receive a lever arm a clamp used to hold the clip to the stator bar while the clip and bar assembly are positioned in the brazing chamber. - The
heating mass 57 assists in applying heat to theclip cover 32 during brazing. The heating mass is heated by thecoil 66. Heat energy is transferred by conduction from themass 57 to theclip cover 32. The heating mass abuts directly against the clip cover (or other exposed outer surfaces of the clip and bar assembly) to promote conductive heat transfer to the cover or exposed outer surfaces. - Further, the heating mass seats in the
U-shaped coil 66. The C-shaped cross-sectional profile of theheating mass 57 substantially fills theentrance area 67 of the U-shaped seat in the coil. For example, the heating mass may fill at least 75% of the entrance area of the seat in the coil. The sides of theheating mass 57 may be substantially parallel and adjacent to the sides of the heating coil to ensure that the mass is heated by the coil. - Mica may be used for
spacers 76 separating the coil from the clip and theheating mass 57 from theram 54. The mica spacer between the coil and clip may be 0.060 inches. A thermal mass spacer may be used to insulate the shaft of theram 54 from theheating mass 57. - A heat sink clamp 69 is attached to the stator bar below the heated end of the bar. The heat sink cools the stator bar below the clip. By cooling the bar, liquefied braze is prevented from flowing down between the strands when the vertical bar is in the braze hood.
- The braze joint is preferably made with the stator bar in a vertical orientation. The vertical orientation is preferred because it aids alloy retention in the joint and permits pieces of the alloy to be more easily pre-placed on the surface of the assembly inside the hydraulic header clip, thereby providing a source of additional braze alloy and/or filler metal that will melt and flow over the
bar 16 end surfaces to create a thicker layer of braze isolation layer over the ends of the solid copper strands of the bar. -
FIG. 4 is a cross-sectional end view of thehydraulic header clip 18, the free ends of the solid 34 and hollow 36 strands, aram 54 pressing theclip cover 34 into the clip and aninduction heating coil 66 to heat the assembly of the clip, strand and brazestrips 30 andsheets 50. The hydraulic header clip 18 (also referred to as a stator bar clip) is formed of an electrically conductive material, such as copper. Theclip 18 is hollow and includes arectangular collar 38 that slides over the outer side surfaces of the end of thearmature winding bar 16. A rectangular slot 39 in the collar receives the end of the armature winding bar and interleavedstrips 30 of the braze alloy. The clip cover 32 fits into the matching rectangular slot 39 in the side of thecollar 38. At the other end of theclip 18 is acylindrical coupling end 40 that is configured to connect to the coolant circuit. -
FIG. 5 is a cross-sectional side view of ahydraulic header clip 18 receiving anarmature winding bar 16 and theram 54 to press theclip cover 32 into the clip slot 39 during brazing. The solid andhollow copper strands header clip 18 by means of theside cover 32 fitted within a similarly shaped slot 39 of the header clip.Ram 54 presses theclip cover 32 into thecollar 38 and compress together the ends of thestrands - The clip and stator bar assembly is seated in an
induction heating coil 66. Mica spacers 76 separate the coil from the clip. The mica spacer between the coil and clip may be 0.060 inches and the spacer between the ram and clip cover may be 0.030 inches. A cooledheat sink clamp 74 grasps thebar 16 just below the clip during the brazing process. - Each
hydraulic header clip 18 includes aninternal manifold chamber 42 within theclip collar 38. Themanifold chamber 42 receives the strand ends 34, 36 of the armature bar and provides a conduit for coolant flowing through theclip 18 to enter or be discharged from thehollow strands 36 of thearmature bar 16. Within the clip, themanifold chamber 42 is internally open to a necked downinternal chamber section 56 and to an expandedsub-chamber 58, which is aligned with thehose coupling 40 and configured to receive coolant flowing into or out of a hose. The external and internal shapes of a clip may vary to suit different armature bar configurations that are present in large liquid cooled turbine generators. - When the
bar 16 is brazed to thehydraulic header clip 18, the free ends of thesolid copper strands 34 are generally flush with aback wall 48 of themanifold chamber 42. The free ends of thehollow copper strands 36 extend partially into themanifold chamber 42. The ends of thehollow copper strands 36 may extend about 10 to 500 thousands of an inch beyond the ends ofsolid strands 34 and into thechamber 42. - The differential lengths of the solid and hollow strands may be achieved by any suitable means including the use of a cutting tool to shorten the solid strands. The alloy strips 30 between the tiers of the solid and hollow strands do not generally extend axially beyond the ends of the
hollow strands 36 so that liquid braze when liquefied does not plug the open ends of the hollow strands. In addition, filler metal 44 and the braze alloy sheets 50 (FIG. 3 ) are pre-placed along the interior walls 46 of the clip to surround the enclosed ends of the hollow and solid strands. The filler metal 44 may be a copper-silver alloy that is positioned between the outer strands and the interior of the clip. - At the end of the brazing process, a braze alloy isolation layer 52 extends axially along and between all sides of each of the
strands solid strands 34 while leaving the ends of thehollow strands 36 open and unobstructed for free flow of coolant through the hollow strands. - The braze joint can be made with the axis of the armature bar in either a horizontal or a vertical orientation. The vertical orientation is preferred because it aids alloy retention in the joint and permits pieces of the alloy to be more easily pre-placed on the surface of the assembly inside the hydraulic header clip, thereby providing a source of additional braze alloy and/or filler metal that will melt and flow over the
bar 16 end surfaces to create a thicker layer of braze isolation layer. -
FIG. 6 is a side view of abrazing chamber 60 assembly. Thebraze chamber 60 is used to form a brazed connection of a liquid-cooled armature bar strand package to thehydraulic header clip 18 with a corrosion resistant braze alloy that is not susceptible to crevice corrosion initiation and provides for an alloy layer at the liquid-cooled interface surface of the brazement. - A split braze chamber has left and right
side hood sections 62 that laterally separate to receive the armature winding bar. Once thebar 16 is mounted vertically in the left hood section, the right hood section closes against the left hood to form a closed chamber.Windows 64 in the hood sections allow the braze process to be viewed. The hood can withstand a brazing temperature of 1,000 degrees Celsius (1,832 degrees Fahrenheit) or more. - A controlled gas atmosphere is pumped into the chamber to purge oxygen and form an internal substantially oxygen free atmosphere within the chamber. The controlled gas atmosphere may comprise mixtures of nitrogen and hydrogen or 100 percent hydrogen. After purging, the oxygen level is preferably less than 500 parts per million (ppm) oxygen in the chamber. A substantially oxygen free atmosphere allows the brazing process to proceed without unwanted oxidation of the braze.
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FIG. 7 is a perspective view of the interior of theleft hood 62 of thechamber 60, without an armature bar or clip seated in thecoil 66. Theinduction heating coil 66 heats the clip and bar to a predetermined brazing temperature for a prescribed time period. The temperature profile of the heating coil is a design choice and depends on the brazing process being performed. - A hook-shaped (or U-shaped)
induction heating coil 66 receives the bar end andhydraulic header clip 18. Anupper guide 71 aligns the top of the hydraulic header clip such that the collar is between thelegs 78 of theinduction coil 66. Aheat sink clamp 74 secures the armature bar vertically within the braze chamber and prevents liquid braze from flowing down between the strands of the bar. Theram 54 presses theclip cover 32 and strand ends 34, 36 into the clip during the braze process. Apneumatic drive cylinder 55 moves the ram and applies a compressive force to the clip cover. - The
bottom wall 68 of the chamber includes a seal to receive the armature bar and prevent leakage of the gas atmosphere in the chamber. The inert gases in the chamber may be maintained at an above-atmospheric pressure to ensure that oxygen does not leak into the chamber. -
Multiple temperature indicators 70 in the chamber and are located at various positions inside the brazing chamber. Anoxygen sensor 72 within the chamber generates a signal in real time of the oxygen level in parts per million in the chamber atmosphere. The oxygen signal may be provided to aprogrammable logic controller 73 for the brazing process. - The programmable logic controller (PLC) 73 automates the braze process protocol. The PLC controls the induction coil and monitors the temperature and oxygen level in the chamber during the brazing process. The PLC may also control the force applied by the
ram - The
heat sink 74 is a straight bar clamp that is spring loaded and grasps thebar 16 just below the clip. The heat sink is water cooled to ensure that thearmature winding bar 16 below the clip is cooler than the liquidus temperature of the braze alloy. The cool armature bar at the clamp point causes liquid braze alloy flowing down between the bar strands to solidify. - While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (12)
1. A heating system for brazing a stator bar to a clip comprising:
a heating coil having a seat to receive the stator bar and clip;
a heating mass adapted to fit into the seat of the coil, and
an extendible press applying the mass to the stator bar or clip.
2. The heating system in claim 1 wherein the heating coil includes a U-shaped section and the stator bar seats in the U-shaped section.
3. The heating system in claim 2 wherein the heating mass seats in the U-shaped section.
4. The heating system in claim 1 wherein the heating mass is conductive.
5. The heating system in claim 1 wherein the heating coil is at least one of a resistive coil and an inductive coil.
6. The heating system in claim 1 wherein the heating mass substantially fills an area defined by an entrance to the heating coil.
7. The heating system in claim 1 wherein the heating mass substantially fills an area defined by an entrance to the U-shaped section.
8. The heating system in claim 1 wherein the stator bar includes a stator bar end and a clip, and the clip further includes a cover fitting into a slot in the clip, and the method further comprises abutting the conductive mass against the cover and conducting heat from the mass to the cover.
9. The heating system in claim 1 wherein the heating coil is an induction or resistive heating coil.
10. The heating system in claim 1 wherein the extendible press is a ram and the ram abuts against the heating mass.
11. The heating system in claim 10 wherein the heating mass is attached to an extendible ram of the press and the mass is applied to the assembly.
12. The heating system in claim 1 wherein the heating coil is stationary and the stator bar is moved into the seated position.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/193,185 US20080296289A1 (en) | 2004-11-19 | 2008-08-18 | Movable heating system having fixed heating source for brazing stator bars |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US62893104P | 2004-11-19 | 2004-11-19 | |
US11/195,590 US7414226B2 (en) | 2004-11-19 | 2005-08-03 | Movable heating method and system having fixed heating source for brazing stator bars |
US12/193,185 US20080296289A1 (en) | 2004-11-19 | 2008-08-18 | Movable heating system having fixed heating source for brazing stator bars |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/195,590 Division US7414226B2 (en) | 2004-11-19 | 2005-08-03 | Movable heating method and system having fixed heating source for brazing stator bars |
Publications (1)
Publication Number | Publication Date |
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US20080296289A1 true US20080296289A1 (en) | 2008-12-04 |
Family
ID=37395866
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/195,590 Active 2027-01-26 US7414226B2 (en) | 2004-11-19 | 2005-08-03 | Movable heating method and system having fixed heating source for brazing stator bars |
US12/193,185 Abandoned US20080296289A1 (en) | 2004-11-19 | 2008-08-18 | Movable heating system having fixed heating source for brazing stator bars |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/195,590 Active 2027-01-26 US7414226B2 (en) | 2004-11-19 | 2005-08-03 | Movable heating method and system having fixed heating source for brazing stator bars |
Country Status (6)
Country | Link |
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US (2) | US7414226B2 (en) |
EP (1) | EP1749611B1 (en) |
JP (1) | JP4921066B2 (en) |
CN (1) | CN1907620B (en) |
AU (1) | AU2006203273B2 (en) |
DE (1) | DE602006006946D1 (en) |
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US7474022B2 (en) * | 2005-09-27 | 2009-01-06 | General Electric Company | Liquid-cooled armature bar clip-to-strand connection and method |
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EP2255913A1 (en) * | 2009-05-19 | 2010-12-01 | Siemens Aktiengesellschaft | Components with a layer made of low melting point component with internally soldered components and soldering method |
US20110031301A1 (en) * | 2009-08-06 | 2011-02-10 | Segletes David S | Joining of Electrical Generator Components |
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DE102012022873A1 (en) * | 2012-11-22 | 2014-05-22 | Compact Dynamics Gmbh | Method for soldering stand and cooler and stand with soldered connection to the stand carrier |
CN102983478B (en) * | 2012-11-30 | 2014-12-10 | 上海电气电站设备有限公司 | Soldering quality control method of large-section copper strand wire of turbonator |
EP2950424B1 (en) | 2014-05-26 | 2020-11-04 | General Electric Technology GmbH | Chamber for conductors of electric machines |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102414175B1 (en) * | 2021-10-22 | 2022-06-28 | 주식회사 디알텍 | Core heating device |
Also Published As
Publication number | Publication date |
---|---|
CN1907620B (en) | 2011-02-02 |
EP1749611B1 (en) | 2009-05-27 |
EP1749611A1 (en) | 2007-02-07 |
AU2006203273B2 (en) | 2011-11-17 |
US7414226B2 (en) | 2008-08-19 |
DE602006006946D1 (en) | 2009-07-09 |
JP4921066B2 (en) | 2012-04-18 |
JP2007043898A (en) | 2007-02-15 |
AU2006203273A1 (en) | 2007-02-22 |
CN1907620A (en) | 2007-02-07 |
US20060108357A1 (en) | 2006-05-25 |
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