WO2021111651A1 - 溶接トランス - Google Patents
溶接トランス Download PDFInfo
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- WO2021111651A1 WO2021111651A1 PCT/JP2020/013131 JP2020013131W WO2021111651A1 WO 2021111651 A1 WO2021111651 A1 WO 2021111651A1 JP 2020013131 W JP2020013131 W JP 2020013131W WO 2021111651 A1 WO2021111651 A1 WO 2021111651A1
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- conductor plate
- coil
- conductive surface
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- 238000003466 welding Methods 0.000 title claims abstract description 53
- 239000002826 coolant Substances 0.000 claims abstract description 14
- 239000004020 conductor Substances 0.000 claims description 147
- 238000010292 electrical insulation Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 2
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 2
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 2
- 102100023591 Polyphosphoinositide phosphatase Human genes 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/10—Single-phase transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/08—High-leakage transformers or inductances
- H01F38/085—Welding transformers
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/241—Electric supplies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/048—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
- H01F27/2852—Construction of conductive connections, of leads
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/08—Cores, Yokes, or armatures made from powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F2027/408—Association with diode or rectifier
Definitions
- the present invention relates to a welding transformer for a resistance welding machine.
- the present inventors adopt a structure in which a welding transformer for a resistance welder controls a primary current by an inverter and circulates cooling water in a secondary coil to realize high-speed and high-quality welding.
- a transformer and a welding device Patent Document 1.
- the welding transformer introduced in Patent Document 1 circulates cooling water by connecting a secondary coil obtained by cutting a copper plate and a refrigerant passage of a conductor that electrically connects them. Due to this structure, it is compact and exhibits the performance of being able to output a large current. Features such as the ability to connect the output terminals of welding transformers in parallel and use them have been highly evaluated. While maintaining this performance, it was required to further simplify the structure and reduce the manufacturing cost. In order to solve this problem, the present invention provides a welding transformer described below.
- the primary coil 12 and the secondary coil 13 are wound around the magnetic core 17, and the primary coil 12 and the secondary coil 13 are wound around the magnetic core 17.
- the secondary coil 13 is formed by connecting the positive coil 14 and the negative coil 16 in series.
- One end of the positive coil 14 and one end of the negative coil 16 are electrically connected to the first common electrode 22.
- One end of the first rectifying element 18 is electrically connected to the other end of the positive coil 14, and one end of the second rectifying element 20 is electrically connected to the other end of the negative coil 16.
- the other end of the first rectifying element 18 and the other end of the second rectifying element 20 are electrically connected to the second common electrode 24.
- the first common electrode 22 and the second common electrode 24 are for electrical connection to the welding machine 28.
- the primary coil 12 is supplied with a pulse-shaped primary current that inverts the polarity at a repetition frequency preset by an inverter.
- the primary coil 12 is divided and wound around a plurality of portions and wound around a magnetic core 17, and a plurality of positive side coils 14 and a plurality of negative side coils 16 are sandwiched between the dividedly wound primary coils 12.
- Flat, electrically and thermally conductive surfaces 30a, 30b and 30c are formed on one end and the other end of all the positive coil 14 and all the negative coils 16. All the conductive surfaces 30a, 30b, 30c are arranged in the common connection region 32 with a space 34 for electrical insulation.
- the group of conductive surfaces 30a formed at one end of all the positive coils 14 and one end of all the negative coils 16 is called a first conductive surface group, and the conductive surfaces formed at the other ends of all the positive coils 14.
- the group of 30b is referred to as a second conductive surface group, and the group of conductive surfaces 30c formed at the other ends of all negative coils 16 is referred to as a third conductive surface group.
- the first conductive surface group is mechanically directly and mechanically joined to the connecting surface of the first conductor plate 42.
- the second conductive surface group is mechanically directly and mechanically joined to the connecting surface of the second conductor plate 44.
- the third conductive surface group is mechanically directly and mechanically joined to the connection surface of the third conductor plate 46.
- the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46 cover the entire common connection region 32, and the first conductor plate 42 occupies the maximum area.
- the first conductor plate 42 is provided with a cavity 48 for circulating a cooling medium inside the conductor plate 42.
- the second conductor plate 44 contacts one end of the first rectifying element 18 via an electrically and thermal second conductive surface group.
- a welding transformer characterized in that the third conductor plate 46 is in contact with one end of the second rectifying element 20 via an electrically and thermal third conductive surface group.
- the first conductor plate 42 includes an annular portion 50 that covers a peripheral portion of the common connection region 32, and a cavity 48 for circulating a cooling medium is provided inside the annular portion 50.
- the welding transformer according to configuration 1.
- the welding transformer according to any one of configurations 1 to 3, wherein the welding transformer is characterized.
- the connecting surfaces of the second conductor plate 44 and the third conductor plate 46 have a convex portion 52 and a concave portion 54, respectively, in a common connection region 32 so as to be in close contact with the second conductive surface group or the third conductive surface group.
- a flat, electrically and thermally conductive surface group is formed in the common connection region 32 of the secondary coil 13.
- the conductive surface group is directly mechanically joined to the connecting surfaces of the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46, respectively.
- the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46 cover the entire common connection region 32.
- Refrigerant can be circulated in the cavity of the first conductor plate 42 to efficiently cool the whole.
- the structure is simplified and the mechanical strength is high.
- the annular portion 50 is provided on the first conductor plate 42, the refrigerant can be circulated in the annular cavity provided inside, and the whole can be efficiently cooled.
- the second conductor plate 44 and the third conductor plate 46 are surrounded by the annular portion 50 of the first conductor plate 42, these can be efficiently cooled.
- the conductive surface group and the conductor plate are joined via the uneven surface 56, the area for heat transfer is wide and the cooling performance is improved. Positioning can be performed with high accuracy by using the uneven surface 56, and the mechanical strength is increased.
- FIG1 is an equivalent circuit of the welding transformer 10.
- FIG. 2 is a current waveform diagram showing the relationship between the switching current and the welding current.
- FIG. 3 is an exploded perspective view of the welding transformer 10 of the present invention.
- FIG. 4 is a perspective view of the secondary coil 13.
- FIG. 5A and FIG. 5B are perspective views of a unit in which a pair of positive side coils 14 and negative side coils 16 are integrated
- FIG. 5C is a partial side view showing a joint state between the conductor surface 30a and the first conductor plate 42.
- FIG. 6 is a perspective view of the first conductor plate 42.
- FIG. 7 is a perspective view of the second conductor plate 44.
- FIG. 8 is a perspective view of the third conductor plate 46.
- FIG. 9 is a perspective view showing a state in which the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46 are connected to the secondary coil 13.
- FIG. 10 is an external perspective view of the welding transformer 10 in
- FIG1 is an equivalent circuit of the welding transformer 10.
- the welding transformer 10 is a device for supplying a welding current to the welding machine 28.
- the welding transformer 10 incorporates a primary coil 12, a secondary coil 13, a first rectifying element 18, and a second rectifying element 20.
- the primary coil 12 and the secondary coil 13 of the welding transformer 10 are wound around a magnetic core 17.
- the secondary coil 13 is a coil in which the positive coil 14 and the negative coil 16 are connected in series.
- a plurality of sets (7 sets in this embodiment) of the secondary coils 13 are electrically connected in parallel to the secondary side of the welding transformer 10.
- One end of the positive coil 14 and one end of the negative coil 16 are electrically connected to the first common electrode 22.
- One end of the first rectifying element 18 is electrically connected to the other end of the positive coil 14, and one end of the second rectifying element 20 is electrically connected to the other end of the negative coil 16.
- the other end of the first rectifying element 18 and the other end of the second rectifying element 20 are electrically connected to the second common electrode 24.
- the first common electrode 22 and the second common electrode 24 are electrically connected to the welding machine 28.
- a pulse-shaped primary current that inverts the polarity at a repetition frequency preset by an inverter is supplied to the primary coil 12.
- FIG. 2 is a current waveform diagram showing the relationship between the switching current and the welding current. This graph shows the change in welding current from the start of one spot welding to the end of welding.
- FIG. 3 is an exploded perspective view of the welding transformer 10 of the present invention.
- the primary coil 12 is divided and wound around a plurality of portions and wound around a magnetic core 17.
- the structure of the primary coil 12 is the same as that introduced in Patent Document 1.
- the secondary coil 13 is sandwiched between the gaps of the separately wound primary coil 12. This structure is also the same as that introduced in Patent Document 1.
- a magnetic core 17 is inserted into the central portion of the primary coil 12 and the secondary coil 13.
- the magnetic core 17a is connected to the end of the magnetic core 17 in order to form a magnetic path in a loop shape.
- the first conductor plate 42 is connected to the secondary coil 13.
- the first conductor plate 42 is for electrically connecting the first common electrode 22 and the secondary coil 13 described in FIG.
- the second conductor plate 44 and the third conductor plate 46 are inserted into holes provided in the first conductor plate 42 with an insulating sheet (not shown) sandwiched between them, and are connected to the secondary coil 13.
- An insulating sheet (not shown) is sandwiched between the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46 in order to electrically separate them from each other.
- the second conductor plate 44 is for electrically connecting the secondary coil 13 and the first rectifying element 18.
- the third conductor plate 46 is for electrically connecting the secondary coil 13 and the second rectifying element 20.
- the fourth conductor plate 47 and the first conductor plate 42 are connected in a U shape and surround the primary coil 12 and the secondary coil 13.
- the first rectifying element 18 is sandwiched between the second conductor plate 44 and the first electrode plate 58.
- the second rectifying element 20 is sandwiched between the third conductor plate 46 and the second electrode plate 60.
- the first electrode plate 58 and the second electrode plate 60 are connected by a connecting plate 62.
- the connecting plate 62 is for electrically connecting the first rectifying element 18 and the second rectifying element 20 to the second common electrode 24 described in FIG.
- the secondary coil 13, the first conductor plate 42, the second conductor plate 44, the third conductor plate 46, the fourth conductor plate 47, the first electrode plate 58, the second electrode plate 60, and the connecting plate 62 are Both can be made by cutting a copper plate.
- FIG. 4 is a perspective view of the secondary coil 13.
- FIG. 5 is a perspective view showing a unit in which a pair of positive side coils 14 and a negative side coil 16 are integrated, and their conduction surfaces 30a, 30b, and 30c.
- the positive side coil 14 and the negative side coil 16 constituting the secondary coil 13 can be manufactured by, for example, combining parts obtained by cutting copper into a shape as shown in the figure.
- One of the pair of one-turn coils arranged side by side is the positive coil 14, and the other is the negative coil 16.
- Each unit is mechanically connected by brazing or welding.
- One end of the positive coil 14 and one end of the negative coil 16 are continuously integrated through a portion provided with a conductive surface 30a.
- the conductive surface 30b at the other end of the positive coil 14 projects from the central portion of the conductive surface 30a.
- the conductive surface 30c at the other end of the negative coil 16 also protrudes from the central portion of the conductive surface 30a.
- FIG. 4 there are those in which the conductive surface 30a has no unevenness as a whole and those in which both ends are one step higher than the central portion.
- three sets of each of the two types of units shown in FIG. 5A and FIG. 5B shown in FIG. 5 and one set of a pair of positive coil 14 and a negative coil 16 at the end are combined and integrated. It was done.
- one terminal portion 14a and 16a (FIG5A) of the positive coil 14 and the negative coil 16 are connected to the conductor surface 30a.
- the other terminal portion 14b (FIG5A) of the positive coil 14 is connected to the conductor surface 30b.
- the other terminal portion 14c (FIG5A) of the negative coil 16 is connected to the conductor surface 30c.
- the conductive surface 30a high and low height portions are alternately arranged in the plane of the common connection region 32 shown in FIG.
- the conductive surface 30b and the conductive surface 30c are arranged in a row at intervals.
- the surfaces of the conductive surface 30a, the conductive surface 30b, and the conductive surface 30c, which are in contact with the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46, are flat and sufficiently wide, and are electrically and thermally. Conduction can be ensured.
- FIG. 5C is a partial side view showing a joint state between the conductor surface 30a and the first conductor plate 42 as viewed from the side of the negative coil 16.
- the conductor surfaces 30a having different heights are arranged alternately, and the uneven surfaces 56 of the first conductor plate 42 described in FIG. 6 are in close contact with them without any gaps.
- the side surface on which the positive coils 14 on the opposite side are lined up has the same structure. Since the first conductor plate 42, the positive coil 14 and the negative coil 16 are in contact with each other over a wide area, a high cooling effect can be obtained.
- the group of conductive surfaces 30a formed at one end of all the positive coils 14 and one end of all the negative coils 16 is called a first conductive surface group, and the conductive surfaces formed at the other ends of all the positive coils 14.
- the group of 30b is referred to as a second conductive surface group, and the group of conductive surfaces 30c formed at the other ends of all negative coils 16 is referred to as a third conductive surface group.
- the first conductive surface group is mechanically directly and mechanically joined to the connecting surface of the first conductor plate 42.
- the second conductive surface group is mechanically directly and mechanically joined to the connecting surface of the second conductor plate 44.
- the third conductive surface group is mechanically directly and mechanically joined to the connecting surface of the third conductor plate 46.
- the conductive surface 30a, the conductive surface 30b, and the conductive surface 30c are provided with a gap 34 for electrical insulation so as to be electrically insulated from each other, and for example, an insulating sheet (not shown) is sandwiched therein.
- the structure of the unit shown in FIG 5 can be freely deformed so as to have the same function.
- Conductive surfaces 30a are arranged in a ring shape in the common connection area 32 so as to surround the entire surface of the common connection area 32. Further, the conductive surface 30b and the conductive surface 30c are arranged in a row at a place surrounded by the conductive surface 30a, respectively.
- FIG. 6 is a perspective view of the first conductor plate 42.
- the first conductor plate 42 is entirely composed of an L-shaped copper plate.
- An uneven surface 56 in which convex portions 52 and concave portions 54 are alternately provided is formed on the connecting surface of the annular portion 50. As described in FIG. 5C, the uneven surface 56 is formed so as to be in close contact with all the conductive surfaces 30a and the upper surface and the side surface thereof.
- the first conductor plate 42 is electrically and mechanically connected to the conduction surface 30a provided at one end of all the positive side coils 14 and the negative side coils 16.
- the uneven surface 56 is brought into close contact with the upper surface and the side surface of the conductive surface 30a, the surface area for heat transfer can be increased as compared with the case where the entire surface is in contact with the flat surface, so that the cooling efficiency is improved.
- Mechanical strength also increases. Further, if the uneven surface 56 is provided, the first conductor plate 42 can be accurately positioned with respect to the secondary coil 13.
- a cavity 48 is formed inside the first conductor plate 42.
- a cross-sectional view along the AA line, the BB line, and the CC line is shown in the upper right.
- the cooling medium is introduced from the introduction port 64, circulates through the inside of the annular portion 50, and is discharged from the discharge port 66.
- a cavity through which the cooling medium flows can be provided inside the fourth conductor plate 47 shown in FIGS. 3 and 10.
- the fourth conductor plate 47 is arranged in the primary coil 12 and the secondary coil 13 in a non-contact manner or via an insulator.
- the fourth conductor plate 47 has a function of indirectly cooling the primary coil 12 and the secondary coil 13.
- the annular portion 50 covers the peripheral portion of the surface of the common connection region 32. Since the cavity 48 having a wide cross-sectional area can be formed in the first conductor plate 42, a large amount of cooling medium such as cooling water can be circulated quickly. Therefore, the annular portion 50 can efficiently cool the secondary coil 13.
- the shape, structure, and path of the cavity 48 can be freely selected in addition to this embodiment.
- the electrically and thermal conductive surface is a connection surface that allows a sufficient current to flow for the welding transformer 10 to operate normally, and is in close contact with a sufficiently wide surface necessary for heat transfer. It is a connection surface that can be made to.
- the first conductive surface group is mechanically connected to the connection surface of the first conductor plate 42 by, for example, welding or brazing.
- FIG. 7 is a perspective view of the second conductor plate 44.
- a concave-convex surface 56 in which convex portions 52 and concave portions 54 are alternately arranged is formed in a portion of the second conductor plate 44 that is in close contact with the secondary coil 13.
- the uneven surface 56 is in close contact with the upper surface and the side surface of the conductive surfaces 30b arranged in a row shown in FIG. 4 and is electrically and mechanically connected.
- the uneven surface 56 and the conductive surface 30b can be connected via a sufficiently large area. Further, by providing the uneven surface 56, the second conductor plate 44 can be positioned with high accuracy and the connection work can be performed.
- the second conductor plate 44 is also provided with a cavity 48 (not shown) for circulating the cooling medium inside the second conductor plate 44, and the cooling medium is supplied from the introduction port 68, which is not shown on the opposite side. It can be discharged from the outlet and cooled.
- FIG. 8 is a perspective view of the third conductor plate 46.
- a concavo-convex surface 56 in which convex portions 52 and concave portions 54 are alternately arranged is also formed in a portion of the third conductor plate 46 that is in close contact with the secondary coil 13.
- the uneven surface 56 is in close contact with the upper surface and the side surface of the conductive surfaces 30c arranged in a row shown in FIG. 4 and is electrically and mechanically connected.
- the effect of the uneven surface 56 is the same as that of the second conductor plate 44.
- the structure capable of cooling is the same as that of the second conductor plate 44.
- the connecting surface of the second conductor plate 44 and the third conductor plate 46 is arranged in a region surrounded by the annular portion 50 of the first conductor plate 42.
- the first conductor plate 42, the second conductor plate 44, and the third conductor plate 46 cover the entire common connection region 32, and the first conductor plate 42 occupies the maximum area. This ensures high cooling capacity.
- FIG. 9 shows a state in which the first conductor plate 42 is connected to the secondary coil 13 and the second conductor plate 44 and the third conductor plate 46 are fitted into the first conductor plate 42.
- an insulating sheet (not shown) is sandwiched between the second conductor plate 44 and the third conductor plate 46. Further, an insulating sheet is also sandwiched between the surfaces of the second conductor plate 44 and the third conductor plate 46 and the first conductor plate 42 in contact with each other.
- FIG. 10 is an external perspective view of a welding transformer in which a main part is completed.
- the secondary coil 13 is sandwiched between the gaps of the separately wound primary coil 12.
- a magnetic core 17 is inserted in the central portion of the primary coil 12 and the secondary coil 13.
- the first rectifying element 18 (hidden in this figure) is fitted in the second conductor plate 44.
- the second rectifying element 18 is sandwiched between the second conductor plate 44 and the first electrode plate 58.
- a second rectifying element 20 (hidden in this figure) is fitted in the third conductor plate 46.
- the second rectifying element 20 is sandwiched between the third conductor plate 46 and the second electrode plate 60.
- the terminal plate 70 and the terminal plate 72 are input terminals of the primary coil 12.
- the first conductor plate 42 is connected to the first common electrode 22.
- the connecting plate 62 is connected to the second common electrode 24.
- the welding transformer 10 operates in this state. It is also possible to use a plurality of welding transformers 10 connected in parallel.
- the first conductor plate 42 has a very simple structure, a large cavity can be provided inside. Since the cooling medium can flow so as to circulate in the annular portion 50, a smooth loop-like flow of the cooling medium can be realized. Since a large amount of refrigerant can be circulated in a short time, high cooling efficiency can be realized.
- the connection part has little electrical resistance loss.
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Abstract
Description
1次コイル12と2次コイル13とが磁心17に巻回され、
2次コイル13は、正側コイル14と負側コイル16とを直列接続したもので、
正側コイル14の一端と負側コイル16の一端を第1の共通電極22に電気接続し、
正側コイル14の他端に第1の整流素子18の一端を電気接続し、負側コイル16の他端に第2の整流素子20の一端を電気接続し、
第1の整流素子18の他端と第2の整流素子20の他端を第2の共通電極24に電気接続し、
第1の共通電極22と第2の共通電極24は溶接機28に電気接続されるためのもので、
1次コイル12は、インバータによりあらかじめ設定された繰り返し周波数で極性を反転させるパルス状の1次電流が供給されるもので、
1次コイル12は複数の部分に分割巻きされて磁心17に巻回されており、複数の正側コイル14と複数の負側コイル16が、分割巻きされた1次コイル12の間に挟み込まれており、
全ての正側コイル14と全ての負側コイル16の一端および他端には、平坦で電気的かつ熱的な導通面30a、30b、30cが形成されており、
全ての上記導通面30a、30b、30cが、共通接続領域32で、電気絶縁のための間隔34を開けて配列されており、
全ての正側コイル14の一端と全ての負側コイル16の一端に形成された導通面30aのグループを第1導通面群と呼び、全ての正側コイル14の他端に形成された導通面30bのグループを第2導通面群と呼び、全ての負側コイル16の他端に形成された導通面30cのグループを第3導通面群と呼ぶことにし、
上記第1導通面群は、第1の導体板42の接続面に直接機械的に接合され、
上記第2導通面群は、第2の導体板44の接続面に直接機械的に接合され、
上記第3導通面群は、第3の導体板46の接続面に直接機械的に接合され、
第1の導体板42と第2の導体板44と第3の導体板46が上記共通接続領域32全体を覆っており、第1の導体板42が最大面積を占め、
第1の導体板42には、その内部に冷却媒体を循環させるための空洞48が設けられ、
第2の導体板44は第1の整流素子18の一端に電気的かつ熱的な第2導通面群を介して接触し、
第3の導体板46は第2の整流素子20の一端に電気的かつ熱的な第3導通面群を介して接触していることを特徴とする溶接トランス。
第1の導体板42は、共通接続領域32の周辺部を覆う環状部50を備え、この環状部50の内部には冷却媒体を循環させるための空洞48が設けられていることを特徴とする構成1に記載の溶接トランス。
第2の導体板44と第3の導体板46の接続面は、第1の導体板42の環状部50に囲まれた領域に配置されていることを特徴とする構成2に記載の溶接トランス。
第1の導体板42の接続面には、共通接続領域32で、上記第1導通面群に密着するように凸部52と凹部54とを交互に配列した凹凸面56が形成されていることを特徴とする構成1乃至3のいずれかに記載の溶接トランス。
第2の導体板44と第3の導体板46の接続面には、それぞれ、共通接続領域32で、上記第2導通面群又は第3導通面群に密着するように凸部52と凹部54とを交互に配列した凹凸面56が形成されていることを特徴とする構成4に記載の溶接トランス。
第2の導体板44と第3の導体板46には、その内部に冷却媒体を循環させるための空洞48が設けられていることを特徴とする構成2に記載の溶接トランス。
第1の導体板42の空洞に冷媒を循環させて効率よく全体を冷却できる。さらに構造が簡素化されており機械的強度も高い。
第1の導体板42に環状部50を設けると、内部に設けた環状の空洞に冷媒を循環させて、効率よく全体を冷却できる。
第2の導体板44と第3の導体板46とを第1の導体板42の環状部50で囲むと、これらを効率よく冷却できる。
導通面群と導体板を凹凸面56を介して接合すると、熱伝達のための面積が広く冷却性能が高まる。凹凸面56を利用して高精度に位置決めができ、機械的強度が高まる。
溶接トランス10は溶接機28に溶接用の電流を供給するための装置である。溶接トランス10には1次コイル12と2次コイル13と第1の整流素子18と第2の整流素子20とが組み込まれている。
FIG3は、本発明の溶接トランス10を分解した斜視図である。
1次コイル12は複数の部分に分割巻きされて磁心17に巻回される。この1次コイル12の構造は特許文献1で紹介されたものと同様である。2次コイル13が、分割巻きされた1次コイル12の各間隙に挟み込まれる。この構造も特許文献1で紹介されたものと同様である。1次コイル12と2次コイル13の中心部分には磁心17が挿入される。磁心17aは磁路をループ状に形成するために磁心17の端に連結される。
FIG4は、2次コイル13の斜視図である。FIG5は、一対の正側コイル14と負側コイル16を一体化したユニットと、それらの導通面30a、30b、30cを示す斜視図である。2次コイル13を構成する正側コイル14と負側コイル16とは、それぞれ、例えば、図のような形状に銅を切削加工した部品を組み合わせて製造することができる。左右に並んだ一対のワンターンコイルのうちの一方が正側コイル14、他方が負側コイル16である。各ユニットはそれぞれろう付けや溶接により機械的に接続される。
正側コイル14の一端と負側コイル16の一端とは、導通面30aを設けた部分を通じて連続一体化している。正側コイル14の他端の導通面30bは、導通面30aの中央部から突き出している。負側コイル16の他端の導通面30cも、導通面30aの中央部から突き出している。
共通接続領域32には導通面30aが、共通接続領域32の面全体を囲むように環状に配列されている。また、導通面30bと導通面30cとが、それぞれ導通面30aに囲まれた場所で、一列に配列されている。
FIG6は、第1の導体板42の斜視図である。
第1の導体板42は、全体がL字形の銅板により構成されている。環状部50の接続面には、凸部52と凹部54とを交互に設けた凹凸面56が形成されている。この凹凸面56は、FIG5Cで説明したように、全ての導通面30aと、その上面と側面とに密着するように形成されている。
FIG7は第2の導体板44の斜視図である。
第2の導体板44の2次コイル13と密着する部分には、凸部52と凹部54とを交互に配列した凹凸面56が形成されている。この凹凸面56は、FIG4に示した一列に並んだ導通面30bの上面と側面とに密着して電気的にかつ機械的に接続される。
FIG8は第3の導体板46の斜視図である。
第3の導体板46の2次コイル13と密着する部分にも、凸部52と凹部54とを交互に配列した凹凸面56が形成されている。この凹凸面56は、FIG4に示した一列に並んだ導通面30cの上面と側面とに密着して電気的にかつ機械的に接続される。凹凸面56の効果は第2の導体板44と同様である。冷却が可能な構造も第2の導体板44と同様である。
FIG9は、2次コイル13に第1の導体板42を接続し、さらに、第1の導体板42に、第2の導体板44と第3の導体板46をはめ込んだ状態を示している。第2の導体板44と第3の導体板46の間には、既に説明したように図示しない絶縁用のシートが挟み込まれている。また第2の導体板44や第3の導体板46と第1の導体板42が接する面にも絶縁用のシートが挟み込まれている。
FIG10は、主要部を完成させた溶接トランスの外観斜視図である。
2次コイル13は、分割巻きされた1次コイル12の各間隙に挟み込まれている。1次コイル12と2次コイル13の中心部分には磁心17が挿入されている。
12 1次コイル
13 2次コイル
14 正側コイル
16 負側コイル
17 磁心
18 第1の整流素子
20 第2の整流素子
22 第1の共通電極
24 第2の共通電極
28 溶接機
30a 導通面
30b 導通面
30c 導通面
32 共通接続領域
34 電気絶縁のための間隔
42 第1の導体板
44 第2の導体板
46 第3の導体板
47 第4の導体板
48 空洞
50 環状部
52 凸部
54 凹部
56 凹凸面
58 第1電極板
60 第2電極板
62 連結板
64 導入口
66 排出口
68 導入口
70 端子板
72 端子板
Claims (6)
- 1次コイルと2次コイルとが磁心に巻回され、
2次コイルは、正側コイルと負側コイルとを直列接続したもので、
正側コイルの一端と負側コイルの一端を第1の共通電極に電気接続し、
正側コイルの他端に第1の整流素子の一端を電気接続し、負側コイルの他端に第2の整流素子の一端を電気接続し、
第1の整流素子の他端と第2の整流素子の他端を第2の共通電極に電気接続し、
第1の共通電極と第2の共通電極は溶接機に電気接続されるためのもので、
1次コイルは、インバータによりあらかじめ設定された繰り返し周波数で極性を反転させるパルス状の1次電流が供給されるもので、
1次コイルは複数の部分に分割巻きされて磁心に巻回されており、複数の正側コイルと複数の負側コイルが、分割巻きされた1次コイルの間に挟み込まれておリ、
全ての正側コイルと全ての負側コイルの一端および他端には、平坦で電気的かつ熱的な導通面が形成されており、
全ての上記導通面が、共通接続領域で、電気絶縁のための間隔を開けて配列されており、
全ての正側コイルの一端と全ての負側コイルの一端に形成された導通面のグループを第1導通面群と呼び、全ての正側コイルの他端に形成された導通面のグループを第2導通面群と呼び、全ての負側コイルの他端に形成された導通面のグループを第3導通面群と呼ぶことにし、
上記第1導通面群は、第1の導体板の接続面に直接機械的に接合され、
上記第2導通面群は、第2の導体板の接続面に直接機械的に接合され、
上記第3導通面群は、第3の導体板の接続面に直接機械的に接合され、
第1の導体板と第2の導体板と第3の導体板が上記共通接続領域全体を覆っており、第1の導体板が最大面積を占め、
第1の導体板には、その内部に冷却媒体を循環させるための空洞が設けられ、
第2の導体板は第1の整流素子の一端に電気的かつ熱的な導通面を介して接触し、
第3の導体板は第2の整流素子の一端に電気的かつ熱的な導通面を介して接触していることを特徴とする溶接トランス。 - 第1の導体板は、共通接続領域の周辺部を覆う環状部を備え、この環状部の内部には冷却媒体を循環させるための空洞が設けられていることを特徴とする請求項1に記載の溶接トランス。
- 第2の導体板と第3の導体板の接続面は、第1の導体板の環状部に囲まれた領域に配置されていることを特徴とする請求項2に記載の溶接トランス。
- 第1の導体板の接続面には、共通接続領域で、上記第1の導通面群に密着するように凸部52と凹部54とを交互に配列した凹凸面が形成されていることを特徴とする請求項1乃至3のいずれかに記載の溶接トランス。
- 第2の導体板と第3の導体板の接続面には、それぞれ、共通接続領域で、上記第2導通面群又は第3導通面群に密着するように凸部52と凹部54とを交互に配列した凹凸面が形成されていることを特徴とする請求項4に記載の溶接トランス。
- 第2の導体板と第3の導体板には、その内部に冷却媒体を循環させるための空洞が設けられていることを特徴とする請求項2に記載の溶接トランス。
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EP20807647.1A EP4070904A4 (en) | 2019-12-03 | 2020-03-24 | WELDING TRANSFORMER |
KR1020207033411A KR102427565B1 (ko) | 2019-12-03 | 2020-03-24 | 용접 트랜스 |
CN202080002727.7A CN113207284B (zh) | 2019-12-03 | 2020-03-24 | 焊接变压器 |
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