WO2023157657A1 - 溶接トランス - Google Patents
溶接トランス Download PDFInfo
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- WO2023157657A1 WO2023157657A1 PCT/JP2023/003370 JP2023003370W WO2023157657A1 WO 2023157657 A1 WO2023157657 A1 WO 2023157657A1 JP 2023003370 W JP2023003370 W JP 2023003370W WO 2023157657 A1 WO2023157657 A1 WO 2023157657A1
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- 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
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- 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
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- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/303—Clamping coils, windings or parts thereof together
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- 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
- H01F27/32—Insulating of coils, windings, or parts thereof
-
- 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
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- 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
Definitions
- the present invention relates to a welding transformer.
- Patent Document 1 discloses a large-current transformer having a primary coil divided into two with a secondary coil interposed therebetween.
- the primary coil is constructed by laminating substantially U-shaped 1-turn coils made by punching copper plates.
- the external terminal of the primary coil for connecting the connection terminal of the external power supply is formed in a plate shape, and the rigidity of the external terminal is low. Therefore, when the connection terminal of the external power supply is fastened to the external terminal of the primary coil with a bolt, the external terminal may be bent and the external terminals of the two split primary coils may be short-circuited.
- the present invention has been made in view of such a point, and its purpose is to suppress short-circuiting between two external terminals due to bending of the external terminals.
- a first aspect is a welding transformer provided with a primary coil in which a plurality of primary unit coils made of plate-shaped conductors are laminated, and the primary coil includes a predetermined number of primary unit coils. a first unit circuit in which coils are connected in series; and a second unit circuit in which a predetermined number of the primary unit coils are connected in series.
- an external terminal drawn out from the main body wherein the external terminal includes a first external terminal provided in the first unit circuit and a second external terminal provided in the second unit circuit; and an insulating spacer member arranged between the first external terminal and the second external terminal.
- the primary coil includes a first unit circuit and a second unit circuit.
- the first unit circuit has a first external terminal made of a plate-shaped conductor.
- the second unit circuit has a second external terminal made of a plate-shaped conductor.
- An insulating spacer member is arranged between the first external terminal and the second external terminal.
- the spacer member can prevent the first external terminal and the second external terminal from approaching each other and bending. As a result, it is possible to prevent the first external terminal and the second external terminal from being short-circuited.
- a second aspect is the welding transformer of the first aspect, further comprising a reinforcing plate extending along at least one of the first external terminal and the second external terminal.
- At least one of the first external terminal and the second external terminal can be reinforced by the reinforcing plate so that it is difficult to bend, and the rigidity can be increased.
- a third aspect is the welding transformer according to the second aspect, wherein the reinforcing plate is arranged on a surface where the first external terminal and the second external terminal face each other.
- the reinforcing plate on the surface where the first external terminal and the second external terminal face each other, the rigidity of the first external terminal and the second external terminal is further increased, and workability is improved.
- a bolt is inserted from the outer surface of the external terminal to connect the terminal of the external power source and fasten the spacer member.
- the workability is improved by fastening the reinforcing plate arranged on the inner surface of the external terminal with a bolt or by fastening them together.
- a fourth aspect is the welding transformer of the third aspect, further comprising an insulating sheet covering the surface of the primary unit coil, and a part of the reinforcing plate is formed between the primary unit coil and the insulating sheet. sandwiched between.
- the fourth aspect by sandwiching a part of the reinforcing plate between the primary side unit coil and the insulating sheet, it is necessary for the worker to support the reinforcing plate so as not to drop it during the assembly work of the reinforcing plate. workability is improved.
- a fifth aspect is the welding transformer according to the third or fourth aspect, wherein terminal holes through which first bolts are inserted are formed in the first external terminal and the second external terminal, respectively, and the reinforcing plate includes: A female screw portion for fastening the first bolt is provided at a position corresponding to the terminal hole.
- the first bolt for terminal connection can be fastened to the female threaded portion without using a separate nut apart from the reinforcing plate. , workability is improved.
- a sixth aspect is the welding transformer according to the fifth aspect, wherein the spacer member is respectively fastened to the first external terminal and the second external terminal by a second bolt, and the reinforcing plate is provided with the second A through hole is formed through which the bolt is inserted.
- the reinforcing plate can be fastened at two different positions by the first bolt and the second bolt, and rotation of the reinforcing plate about one bolt is restricted by the other bolt. be able to. As a result, loosening of the bolt due to rotation of the reinforcing plate can be suppressed.
- FIG. 1 is a perspective view of the welding transformer according to the present embodiment, viewed from the primary side external terminal.
- FIG. 2 is a perspective view of the welding transformer viewed from the secondary external terminal.
- FIG. 3 is an exploded perspective view of the essential parts of the welding transformer.
- FIG. 4 is an exploded perspective view of the magnetic core.
- FIG. 5 is a plan view of the first unit coil.
- FIG. 6 is a plan view of the second unit coil.
- FIG. 7 is a schematic diagram showing an exploded portion surrounded by a dashed line shown in the upper left of FIG.
- FIG. 8 is a plan view of a secondary unit coil.
- FIG. 9 is a schematic diagram showing an exploded portion surrounded by a dashed line shown in the lower right of FIG.
- FIG. 10 is a perspective view showing the structure of a spacer member.
- FIG. 11 is a perspective view showing the configuration of the reinforcing plate.
- FIG. 12 is a side view showing the configuration around the
- welding transformer 100 includes primary coil 10 , secondary coil 20 , magnetic core 40 , and fixture 50 .
- Welding transformer 100 is used, for example, as a voltage converter of a welding inverter power source (not shown).
- the side of the fixture 50 shown in FIG. is sometimes referred to as the lower side.
- the primary side coil 10 is configured as a unit circuit for each of four primary side unit coils 11 connected in series. Also, this unit circuit has five external terminals.
- the primary coil 10 includes two unit circuits, but is not particularly limited to this.
- the number of unit circuits included in the primary coil 10 may be one, or three or more. It can be changed as appropriate according to the specifications required for the welding transformer 100 .
- the primary side unit coil 11 is a one-turn coil made of a copper plate. This will be detailed later. Also, a connection mode of the four primary side unit coils 11 will be described later.
- the primary side coil 10 is a so-called high voltage side coil that is connected to an external power source, for example, an external commercial power source.
- an external power source for example, an external commercial power source.
- the number of turns of the primary-side coil 10 in the unit circuit is four.
- the number of turns of the primary coil 10 in the unit circuit is one.
- the secondary coil 20 is configured as a unit circuit for every four secondary unit coils 21 .
- This unit circuit also has three secondary external terminals 20a to 20c.
- the secondary external terminals 20a to 20c are provided with external connection holes 20a1 to 20c1 to which wirings for connection with other circuits are connected, respectively.
- the number of unit circuits included in the secondary coil 20 is basically the same as the number of unit circuits included in the primary coil 10 .
- the secondary unit coil 21 is also a one-turn coil made of a copper plate. This will be discussed later. Also, a connection mode of the four secondary unit coils 21 will be described later.
- the secondary side coil 20 is a so-called low-voltage side coil that is connected to an internal busbar wiring (not shown) of an inverter power supply or an internal circuit (not shown) such as a semiconductor power converter.
- the secondary coil 20 in the unit circuit can be changed. Change the number of turns.
- the number of turns of the secondary coil 20 in the unit circuit is four.
- the number of turns of the primary coil 10 in the unit circuit is two.
- the number of turns of the primary coil 10 in the unit circuit is two. That is, the secondary external terminal 20b corresponds to an intermediate tap terminal. Depending on the specifications required for welding transformer 100, it is possible to change the combination of two terminals connected to the output side, and thus the number of turns of secondary coil 20 in the unit circuit.
- the magnetic core 40 is configured by combining two E-shaped cores 41 and 42 .
- four magnetic cores 40 are arranged in parallel.
- the number of magnetic cores 40 to be used can be appropriately changed according to the size of the welding transformer 100 , particularly the size of the primary coil 10 and the secondary coil 20 .
- the E-shaped core 41 is made of a magnetic material such as ferrite, and has three protrusions 41a to 41c and grooves 41d and 41e provided therebetween.
- the E-shaped core 42 is made of a magnetic material such as ferrite, and has three projections 42a to 42c and grooves 42d and 42e provided therebetween.
- the convex portions 41 b and 42 b are arranged inside the primary coil 10 and the secondary coil 20 .
- two opposing sides of the body portions 12 and 22 (see FIGS. 3, 5, 6 and 8) of the primary coil 10 and the secondary coil 20 are located in the groove portions 41d and 42d and the groove portions 41e and 42e. accommodated respectively.
- a cylindrical insulating sheet 31 is arranged inside the primary coil 10 and the secondary coil 20 along the inner peripheral surfaces thereof. By doing so, insulation between the magnetic core 40 and the primary coil 10 and the secondary coil 20 is ensured.
- the fixture 50 has a pressing plate 51 and a support plate 52.
- a laminated body of the primary coil 10 and the secondary coil 20 in which the magnetic core 40 is incorporated is placed on the support plate 52, and the laminated body is pressed by the pressing plate 51 from above and screwed or the like.
- the holding plate 51 is connected to the support plate 52 . By doing so, the laminated body of the primary coil 10 and the secondary coil 20 in which the magnetic core 40 is incorporated is held and fixed.
- the primary unit coil 11 includes a first unit coil 111 and a second unit coil 112 .
- the first unit coil 111 is formed by a set of a plurality of copper plates 111a (for example, three) having the same shape. Each thickness of the copper plate 111a is about 0.4 mm to 1.0 mm.
- the insulating sheets 32 are sandwiched between the three copper plates 111a that are superimposed.
- a laminate of three copper plates 111a and two insulating sheets 32 shown in FIG. 7 is wrapped with an insulating sheet 33 and further wrapped with an insulating sheet 30 to form one first unit coil 111 shown in FIG.
- the second unit coil 112 is also formed as a set of a plurality of copper plates (for example, three) having the same shape.
- the thickness of each copper plate is also the same as the thickness of the copper plate 111a.
- An insulating sheet 32 is sandwiched between each of the three laminated copper plates, and the laminate is further wrapped with an insulating sheet 33 and further wrapped with an insulating sheet 30 to form the second unit coil 112 shown in FIG. be done.
- the number of copper plates included in each of the first unit coil 111 and the second unit coil 112 is not particularly limited to the example shown in FIG. It can be changed as appropriate according to the number of turns of .
- the first unit coil 111 and the second unit coil 112 are obtained by punching a copper plate, for example.
- the first unit coil 111 and the second unit coil 112 may be formed by bending a rectangular copper wire in the edgewise direction (width direction).
- the recessed portion 13a of the corner portion 13, the terminal hole 14a of the first terminal portion 14, the terminal hole 15a of the second terminal portion 15, and the insertion hole 15b are formed by performing different processing ( 5 and 6).
- the first unit coil 111 and the second unit coil 112 each have a body portion 12, a first terminal portion 14, and a second terminal portion 15.
- the main body part 12 has a substantially square annular shape and has four corner parts 13 .
- recessed portions 13a that are recessed toward the outer peripheral side are formed on the inner peripheral surfaces of the four corner portions 13, respectively.
- the concave portion 13 a is formed so that the four corner portions 13 have the same radius of curvature R of the concave portion 13 a when viewed from above.
- the recess 13a is formed so that the main body portion 12 is removed within the range of the same distance R from the top portion of the inner peripheral side of the corner portion 13 when the recess 13a is not formed.
- the concave portions 13a of the first unit coil 111 and the second unit coil 112 are formed to have the same radius of curvature R.
- the outer shape and size of each main body portion 12 are set to be substantially the same.
- the first terminal portion 14 and the second terminal portion 15 are pulled out from both ends of the main body portion 12 and extend in the same direction in parallel with a space therebetween.
- the arrangement of the first terminal portion 14 and the second terminal portion 15 is different between the first unit coil 111 and the second unit coil 112.
- the second terminal portion 15 of the first unit coil 111 is a portion extending from the end of one side of the body portion 12 .
- the first terminal portion 14 is a portion extending in parallel with the second terminal portion 15 with a gap from the end of another side of the body portion 12 extending in the direction intersecting the second terminal portion 15 . .
- both ends of the body portion 12 are spaced apart from each other on one side of the body portion 12 that intersects the extending direction of the first terminal portion 14 and the second terminal portion 15 . They are set apart from each other.
- a first terminal portion 14 extends from one end of the body portion 12, and a second terminal portion 15 extends from the other end in parallel.
- the first terminal portion 14 of the first unit coil 111 corresponds to the first terminal portion 14 of the second unit coil 112 in plan view. It is provided at a position overlapping the second terminal portion 15 . More specifically, a terminal hole 14a (see FIG. 5) provided in the first terminal portion 14 of the first unit coil 111 and a terminal hole 15a (see FIG. 6) provided in the second terminal portion 15 of the second unit coil 112 ) of the first unit coil 111 (see FIG. 5) and the second terminal portion 15 (see FIG. 6) of the second unit coil 112 are set respectively.
- the two second unit coils 112 are arranged so that the two second unit coils 112 are turned upside down (inverted to each other) so that the respective main body portions 12 overlap each other, one of the coils 112 is shown in plan view.
- the first terminal portion 14 of the second unit coil 112 is provided at a position overlapping the first terminal portion 14 of the other second unit coil 112 .
- the terminal hole 14a provided in the first terminal portion 14 of one of the second unit coils 112 and the terminal hole 14a provided in the first terminal portion 14 of the other second unit coil 112 overlap each other.
- the arrangement of the first terminal portions 14 of the second unit coils 112 is set.
- the secondary unit coil 21 shown in FIGS. 8 and 9 includes a plurality of copper plates 21a (for example, 2 ) are formed as one set. Each thickness of the copper plate 21a is about 0.4 mm to 1.0 mm.
- an insulating sheet 32 is sandwiched between the two copper plates 21a that are superimposed.
- the laminate of two copper plates 21a and one insulating sheet 32 shown in FIG. 9 is further wrapped with an insulating sheet 33 to form the secondary unit coil 21 shown in FIG.
- the number of copper plates 21a included in the secondary unit coil 21 is not particularly limited to the example shown in FIG. It can be changed as appropriate. Also, the secondary unit coil 21 is manufactured by the same method as the first unit coil 111 and the second unit coil 112 described above.
- the secondary unit coil 21 shown in FIG. 3 is configured by laminating two plane-shaped coils shown in FIG. However, it is not particularly limited to this, and can be changed as appropriate according to the range of electrical resistance and current allowed for the secondary coil 20 .
- the secondary unit coil 21 may be composed of only one planar coil shown in FIG.
- the first unit coil 111 may be configured by stacking two planar coils shown in FIG.
- the second unit coil 112 may be configured by stacking two planar coils shown in FIG.
- the secondary unit coil 21 includes a main body portion 22 and a first terminal, similarly to the first unit coil 111 (see FIG. 5) and the second unit coil 112 (see FIG. 6). Each has a portion 24 and a second terminal portion 25 .
- the shape of the main body portion 22 and the provision of recesses 23 a on the inner peripheral surfaces of the four corner portions 23 are also the same as those of the first unit coil 111 and the second unit coil 112 .
- the curvature radius R of the recessed portion 23a is the same for the four corner portions 23, in other words, the main body is in the range of the same distance R from the inner peripheral side top portion of the corner portion 23 when the recessed portion 23a is not formed.
- the concave portion 23a is formed so that the portion 22 is removed.
- the concave portion 23 a of the secondary unit coil 21 is formed so that the curvature radius R is the same as the curvature radius R of the concave portion 13 a of the first unit coil 111 and the second unit coil 112 . Also, in the secondary unit coil 21 , the outer shape and size of the body portion 22 are set to be substantially the same as those of the first unit coil 111 and the second unit coil 112 .
- the first terminal portion 24 and the second terminal portion 25 are pulled out from both ends of the body portion 22 and extend in parallel in the same direction.
- the second terminal portion 25 of the secondary unit coil 21 is a portion that extends from the end of one side of the body portion 22 . Also, the first terminal portion 24 extends in parallel with the second terminal portion 25 with a space therebetween from the end of another side of the body portion 22 extending in the direction intersecting the second terminal portion 25 .
- the first terminal portion 24 of the secondary unit coil 21 is provided at a position overlapping the first terminal portion 24 of the other secondary unit coil 21 . Furthermore, the terminal hole 24a provided in the first terminal portion 24 of one secondary unit coil 21 and the terminal hole 24a provided in the first terminal portion 24 of the other secondary unit coil 21 overlap. Thus, the arrangement of the first terminal portions 24 of the secondary unit coils 21 is set.
- the primary unit coil 11 is covered with an insulating sheet 30 .
- an insulating sheet 32 is sandwiched between each of the plurality of copper plates of the primary unit coil 11 and the secondary unit coil 21 (see FIGS. 7 and 9).
- a laminate of one or more insulating sheets 32 and a plurality of copper plates is covered with an insulating sheet 33 .
- the insulating sheet 33 is formed by cutting a single sheet of insulating paper at a plurality of locations. The number, position and length of the cuts correspond to the respective shapes of the primary unit coil 11 and the secondary unit coil 21, and the insulating sheet 33 is bent at the cuts to form the primary unit coil 11. and the secondary unit coil 21 respectively.
- the surfaces of the primary side unit coils can be completely covered with the insulating sheets 33 and 30 except for the first terminal portions 14 and 24 and the second terminal portions 15 and 25. can.
- each surface of the secondary unit coil 21 can be completely covered with the insulating sheet 33 .
- the insulating sheet 30 covering the primary unit coil 11 is provided with a folded portion 30a (see FIG. 3). Wrapped in 30a.
- providing the folded portion 30a is not essential and may be omitted.
- the primary coils 10 and the secondary coils 20 are alternately arranged in this order from the top.
- the primary unit coils 11 and the secondary unit coils 21 are alternately laminated while being insulated from each other by the insulating sheets 30 .
- the first unit coil 111 and the second unit coil 112 that make up the primary coil 10 are arranged as shown below.
- the first unit coils 111 are arranged on the first and fourth sheets, and the second unit coils 112 are arranged on the second and third sheets in this order from the top.
- the first unit coil 111 arranged on the fourth sheet faces the first unit coil 111 arranged on the first sheet so that the positions of the terminal portions are symmetrical in the lateral direction.
- the second unit coil 112 arranged on the third sheet is arranged with placed backwards.
- the two terminal portions 15 can be superimposed when viewed from the top so that the terminal holes 14a and 15a formed in the respective portions overlap with each other.
- the primary-side external terminal 10b (see FIGS. 1 and 3) can be formed by fastening screws (not shown) through the two terminal holes 14a and 15a.
- the first terminal portion 14 of the third second unit coil 112 and the first terminal portion 14 of the second second unit coil 112 are overlapped when viewed from above, and the primary side external terminal 10c ( 1 and 3) can be formed.
- the second terminal portion 15 of the second unit coil 112 of the second sheet and the first terminal portion 14 of the first unit coil 111 of the first sheet are overlapped in top view to form the primary side external terminal 10d (Fig. 1, 3) can be formed.
- the second terminal portion 15 of the fourth first unit coil 111 constitutes the primary side external terminal 10a (the first external terminal 71 and the second external terminal 72), and the first unit coil 111 of the first sheet constitutes the primary side external terminal 10e (first external terminal 71, second external terminal 72).
- the secondary unit coils 21 (see FIGS. 3, 8, and 9) forming the secondary coils 20 (see FIGS. 1, 2, and 3) are arranged as follows.
- the secondary unit coils 21 arranged in the first and second sheets are arranged so that the front and back face the same direction from the top.
- the secondary unit coils 21 arranged in the third and fourth sheets are arranged so that the front and back faces are oriented in the same direction.
- the secondary unit coils 21 arranged on the second and third sheets are arranged upside down. In other words, with respect to the secondary unit coils 21 arranged in the first and second sheets, the secondary unit coils 21 arranged in the third and fourth sheets are arranged upside down. .
- the terminal portions 25 can be superimposed so that the terminal holes 25a formed in the respective portions overlap each other.
- the bolts 61 By passing the bolts 61 through the two terminal holes 25a and a through hole (not shown) provided in the secondary external terminal 20a and tightening them, as shown in FIG. can be connected to the second terminal portion 25 of the secondary unit coil 21 and the secondary external terminal 20a.
- first terminal portion 24 of the fourth secondary unit coil 21 and the first terminal portion 24 of the third secondary unit coil 21 are overlapped in top view, and bolts 61, washers 62 and The nuts 63 can be used to connect the first terminal portions 24 of the third and fourth secondary unit coils 21 and the secondary external terminals 20b.
- a parallel connection structure 26 is formed in which the third secondary unit coil 21 and the fourth secondary unit coil 21 are connected in parallel.
- first terminal portions 24 of the second and first secondary unit coils 21 are shown in top view with respect to the first terminal portions 24 of the third and fourth secondary unit coils 21 .
- the terminal holes 24a can be overlapped with each other. Therefore, bolts 61, washers 62 and nuts 63 are used to connect the first terminal portions 24 of the first to fourth secondary unit coils 21 and the secondary external terminals 20b as shown in FIG. be able to.
- the second terminal portion 25 of the second secondary unit coil 21 and the second terminal portion 25 of the first secondary unit coil 21 are superimposed in top view, and terminal holes 25a provided in each can overlap.
- By fastening bolts 61 through the two terminal holes 25a and a through hole (not shown) provided in the secondary external terminal 20c, as shown in FIG. can be connected to the terminal hole 25a of the second terminal portion 25 of the secondary unit coil 21 and the secondary external terminal 20c.
- a parallel connection structure 26 (see FIG. 3) is formed in which the first secondary unit coil 21 and the second secondary unit coil 21 are connected in parallel. Also, two sets of parallel connection structures 26 are connected in series.
- the primary coil 10 has five primary external terminals 10a to 10e.
- the primary side external terminals 10b to 10d are formed by overlapping the first terminal portion 14 (see FIG. 5) of the first unit coil 111 and the second terminal portion 15 (see FIG. 6) of the second unit coil 112. formed together. Therefore, the plate thickness of the primary-side external terminals 10b to 10d is equivalent to the thickness of two unit coils, and the rigidity is high.
- the primary-side external terminals 10a and 10e are composed of the second terminal portion 15 (see FIG. 5) of the first unit coil 111. Therefore, the plate thickness of the primary side external terminals 10a and 10e is only the thickness of one unit coil. If they are fastened together, the primary side external terminals 10a and 10e may be bent, and the external terminals of the two unit circuits may be short-circuited.
- the primary coil 10 includes a first unit circuit 16 in which a predetermined number of primary unit coils 11 are connected in series, and a predetermined number of primary unit coils. and a second unit circuit 17 in which 11 are connected in series.
- the first unit circuit 16 is provided with primary-side external terminals 10a to 10e.
- the primary external terminals 10a and 10e are referred to as a first external terminal 71.
- the second unit circuit 17 is provided with primary side external terminals 10a to 10e.
- the primary external terminals 10a and 10e are referred to as second external terminals 72.
- the first external terminal 71 and the second external terminal 72 are arranged with a gap in the vertical direction.
- a spacer member 73 is arranged between the first external terminal 71 and the second external terminal 72 .
- the spacer member 73 is formed in a hexagonal prism shape. Note that the shape of the spacer member 73 is not limited to this.
- the spacer member 73 has insulating properties.
- the spacer member 73 is made of, for example, a resin having a heat resistant temperature of 155° or higher. This prevents the insulation type (F) of the welding transformer 100 from deteriorating. Threaded holes 73 a are formed at both ends of the spacer member 73 in the axial direction.
- the first external terminal 71 and the second external terminal 72 are reinforced by reinforcing plates 75 .
- the reinforcing plate 75 is made of plate-shaped stainless steel, for example.
- Stainless steel is a metal with high strength and has a natural potential close to that of copper, so it can suppress electrolytic corrosion and prevent deterioration at the contact portion of dissimilar metals.
- a female screw portion 76 and a through hole 77 are formed in the reinforcing plate 75 .
- the reinforcing plates 75 that reinforce the first external terminals 71 and the second external terminals 72 are arranged so as to extend along the first external terminals 71 and the second external terminals 72, respectively.
- the reinforcing plate 75 on the side of the first external terminal 71 is arranged on the surface of the first external terminal 71 facing the second external terminal 72 (the bottom surface of the first external terminal 71 in FIG. 10).
- the reinforcing plate 75 on the second external terminal side is arranged on the surface of the second external terminal 72 facing the first external terminal 71 (the upper surface of the second external terminal 72 in FIG. 10).
- a part of the reinforcing plate 75 is sandwiched between the primary unit coil 11 and the insulating sheet 33 .
- the base end portion of the reinforcing plate 75 is inserted into the insulating sheet 33 so that the distal end portion of the reinforcing plate 75 does not protrude from the distal end portions of the first external terminal 71 and the second external terminal 72 .
- a terminal hole 15a and an insertion hole 15b are formed in the first external terminal 71 and the second external terminal 72 as the first unit coil 111 (see also FIG. 5).
- a first bolt 81 is inserted through the terminal hole 15a.
- a second bolt 82 is inserted through the insertion hole 15b.
- the reinforcing plate 75 is provided with a female screw portion 76 at a position corresponding to the terminal hole 15a. After drilling a hole in the reinforcing plate 75, the female threaded portion 76 is burred to extend the hole cylindrically while enlarging the hole through a conical mold, thereby forming a screw hole in the cylindrically extended portion. It is preferably configured with a so-called burring tap screw. Alternatively, the reinforcing plate 75 may be integrally formed by welding the female screw portion 76 . A through hole 77 through which the second bolt 82 is inserted is formed in the reinforcing plate 75 .
- the reinforcing plate 75 is preferably made of a thin plate (1.5 mm, for example).
- the reinforcing plate 75 is thin while ensuring the thread length of the female screw portion 76, and the female screw portion 76 is formed integrally with the thin reinforcing plate 75 by burring, welding, or the like. is preferred.
- a connection terminal of an external power supply (not shown) is connected to the first external terminal 71 by a first bolt 81 .
- a connection terminal of an external power supply (not shown) is sandwiched between the first bolt 81 and the first external terminal 71 .
- the second external terminal 72 is connected to a connection terminal of an external power supply (not shown) by a first bolt 81 .
- first bolt 81 a connection terminal of an external power supply (not shown)
- the connection terminal of the external power supply (not shown) is sandwiched between the first bolt 81 and the second external terminal 72 .
- the upper end of the spacer member 73 is fixed by fastening the second bolt 82 inserted through the insertion hole 15 b of the first external terminal 71 and the through hole 77 of the reinforcing plate 75 to the screw hole 73 a of the spacer member 73 . .
- the lower end of the spacer member 73 is fixed by fastening the second bolt 82 inserted through the insertion hole 15 b of the second external terminal 72 and the through hole 77 of the reinforcing plate 75 into the screw hole 73 a of the spacer member 73 .
- the first bolt 81 for connecting the connection terminal of the external power supply (not shown) and the second bolt 82 for fixing the spacer member 73 are used separately.
- connection terminal of the external power source (not shown) and fix the spacer member 73
- the connection terminal of the external power source is also loosened. Operation may become unstable.
- first bolt 81 and second bolt 82 are used as in the present embodiment, even if the second bolt 82 is loosened, the first bolt 81 is not loosened. There is no adverse effect on the operational stability of the welding transformer 100.
- the first external terminal 71 of the first unit circuit 16 and the second external terminal 72 of the second unit circuit 17 in the primary coil 10 By arranging the spacer member 73 therebetween, the spacer member 73 can prevent the first external terminal 71 and the second external terminal 72 from approaching each other and bending. As a result, it is possible to prevent the first external terminal 71 and the second external terminal 72 from being short-circuited.
- the reinforcing plate 75 along the first external terminal 71 and the second external terminal 72, the first external terminal 71 and the second external terminal 72 are reinforced so as to be difficult to bend, and the first external terminal Rigidity of the terminal 71 and the second external terminal 72 can be increased.
- the reinforcing plate 75 is arranged on the surface where the first external terminal 71 and the second external terminal 72 face each other, the rigidity of the first external terminal 71 and the second external terminal 72 is further increased, and workability is improved. do.
- the second bolt 82 is inserted through the outer surface of the first external terminal 71 (upper surface in FIG. 10) and the outer surface of the second external terminal 72 (lower surface in FIG. 10). Then, terminal connection of an external power source (not shown) and fastening of the spacer member 73 are performed.
- reinforcing plates 75 arranged on the inner surface of the first external terminal 71 (lower surface in FIG. 10) and the inner surface of the second external terminal 72 (upper surface in FIG. 10) are fastened with the second bolts 82. Workability is improved by tightening together.
- part of the reinforcing plate 75 is sandwiched between the primary unit coil 11 and the insulating sheet 33 . This eliminates the need for the worker to support the reinforcing plate 75 to prevent it from falling during the work of assembling the reinforcing plate 75, thereby improving workability.
- the reinforcing plate 75 is integrally provided with a female screw portion 76 .
- the first bolt 81 for terminal connection can be fastened to the female screw portion 76 without using a separate nut apart from the reinforcing plate 75, thereby improving workability.
- the reinforcing plate 75 is fastened at two different positions with the first bolt 81 and the second bolt 82 .
- the rotation of the reinforcing plate 75 about one bolt can be restricted by the other bolt.
- loosening of the bolt due to rotation of the reinforcing plate 75 can be suppressed.
- the primary unit coil 11 of the primary coil 10 and the secondary unit coil 21 of the secondary coil 20 are each made of a copper plate. Materials other than copper may be used depending on the range of electrical resistance allowed for the primary coil 10 and the secondary coil 20 . In other words, each of the plate-shaped conductors having an allowable electric resistance range for the primary unit coil 11 and the secondary unit coil 21 may be used.
- the present invention has a highly practical effect that it is possible to suppress short-circuiting between two external terminals due to bending of the external terminals. Therefore, it is extremely useful and industrially applicable. sexuality is high.
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Abstract
Description
図1及び図2に示すように、溶接トランス100は、1次側コイル10と、2次側コイル20と、磁性体コア40と、固定具50と、を備える。溶接トランス100は、例えば、溶接用インバータ電源(図示せず)の電圧変換部として用いられる。
図3に示すように、1次側単位コイル11には、第1単位コイル111と、第2単位コイル112と、が含まれる。また、図7に示すように、第1単位コイル111は、さらに複数の同形状の銅板111a(例えば3枚)を1組として形成される。銅板111aのそれぞれの厚さは、0.4mm~1.0mm程度である。
図3に示すように、1次側単位コイル11は、絶縁シート30で覆われる。また、上述した1次側単位コイル11及び2次側単位コイル21が有する複数の銅板のそれぞれの間に、絶縁シート32が挟み込まれる(図7、図9参照)。1又は複数の絶縁シート32と複数の銅板との積層体が、絶縁シート33で覆われる。
図1に示すように、1次側コイル10は、5つの1次側外部端子10a~10eを有する。ここで、1次側外部端子10b~10dは、第1単位コイル111の第1端子部14(図5参照)と、第2単位コイル112の第2端子部15(図6参照)とを重ね合わせて形成される。そのため、1次側外部端子10b~10dの板厚は、単位コイル2枚分の厚みとなり、剛性が高くなっている。
このため、雌ネジ部76のネジ長さを確保しつつ薄い板厚の補強板75とし、薄い板厚の補強板75に対し雌ネジ部76をバーリング加工や溶接等により一体的に形成するのが好ましい。
以上のように、本実施形態に係る溶接トランス100によれば、1次側コイル10における、第1単位回路16の第1外部端子71と、第2単位回路17の第2外部端子72との間にスペーサ部材73を配置することで、スペーサ部材73によって、第1外部端子71及び第2外部端子72が互いに近づいて屈曲するのを抑えることができる。その結果、第1外部端子71及び第2外部端子72が短絡するのを抑えることができる。
前記実施形態については、以下のような構成としてもよい。
10a 1次側外部端子(外部端子)
10e 1次側外部端子(外部端子)
11 1次側単位コイル
12 本体部
15a 端子孔
16 第1単位回路
17 第2単位回路
33 絶縁シート
71 第1外部端子
72 第2外部端子
73 スペーサ部材
75 補強板
76 雌ネジ部
77 貫通孔
81 第1ボルト
82 第2ボルト
100 溶接トランス
Claims (6)
- 板状の導体からなる1次側単位コイルが複数積層された1次側コイルを備えた溶接トランスであって、
前記1次側コイルは、所定枚数の前記1次側単位コイルが直列接続された第1単位回路と、所定枚数の前記1次側単位コイルが直列接続された第2単位回路と、を含み、
前記1次側単位コイルは、環状に延びる本体部と、前記本体部から引き出された外部端子と、を有し、
前記外部端子は、前記第1単位回路に設けられた第1外部端子と、前記第2単位回路に設けられた第2外部端子と、を含み、
前記第1外部端子と前記第2外部端子との間に配置された絶縁性のスペーサ部材を備える
溶接トランス。 - 請求項1の溶接トランスにおいて、
前記第1外部端子及び前記第2外部端子のうち少なくとも一方に沿って延びる補強板を備える
溶接トランス。 - 請求項2の溶接トランスにおいて、
前記補強板は、前記第1外部端子と前記第2外部端子とが対向する面に配置される
溶接トランス。 - 請求項3の溶接トランスにおいて、
前記1次側単位コイルの表面を覆う絶縁シートを備え、
前記補強板の一部は、前記1次側単位コイルと前記絶縁シートとの間に挟み込まれる
溶接トランス。 - 請求項3又は4の溶接トランスにおいて、
前記第1外部端子及び前記第2外部端子には、第1ボルトを挿通させる端子孔がそれぞれ形成され、
前記補強板には、前記端子孔に対応する位置に、前記第1ボルトを締結させる雌ネジ部が設けられる
溶接トランス。 - 請求項5の溶接トランスにおいて、
前記スペーサ部材は、第2ボルトによって、前記第1外部端子及び前記第2外部端子にそれぞれ締結され、
前記補強板には、前記第2ボルトを挿通させる貫通孔が形成される
溶接トランス。
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EP23756184.0A EP4481775A4 (en) | 2022-02-21 | 2023-02-02 | WELDING TRANSFORMER |
CN202380022616.6A CN118872012A (zh) | 2022-02-21 | 2023-02-02 | 焊接变压器 |
JP2024501277A JPWO2023157657A1 (ja) | 2022-02-21 | 2023-02-02 | |
US18/789,062 US20240387097A1 (en) | 2022-02-21 | 2024-07-30 | Welding transformer |
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CN112756758B (zh) * | 2021-01-08 | 2024-05-28 | 合肥三宇电器有限责任公司 | 一种低压大电流轻量化点焊机 |
Citations (4)
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JPS6060172U (ja) * | 1983-09-13 | 1985-04-26 | 本田技研工業株式会社 | 整流器付トランス装置 |
JP2000223320A (ja) | 1999-01-28 | 2000-08-11 | Hitachi Ferrite Electronics Ltd | 大電流用トランス |
JP2002075737A (ja) * | 2000-08-24 | 2002-03-15 | Matsushita Electric Ind Co Ltd | 薄形トランスおよびその製造方法 |
WO2018193504A1 (ja) * | 2017-04-17 | 2018-10-25 | 三菱電機株式会社 | 平面トランス、レーザダイオード駆動用電源装置及びレーザ加工装置 |
Family Cites Families (5)
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FR2615319B1 (fr) * | 1987-05-15 | 1989-07-07 | Bull Sa | Transformateur a fort couplage adapte a un circuit d'alimentation a decoupage et circuit d'alimentation a decoupage comportant un tel transformateur |
US5010314A (en) * | 1990-03-30 | 1991-04-23 | Multisource Technology Corp. | Low-profile planar transformer for use in off-line switching power supplies |
WO2002071422A1 (fr) * | 2001-03-05 | 2002-09-12 | Tdk Corporation | Bobine plane et transformateur plan |
US7439839B2 (en) * | 2006-01-30 | 2008-10-21 | Nemic-Lambda Ltd. | High-current electrical coil, and transformer construction including same |
JP2023099243A (ja) * | 2020-06-03 | 2023-07-12 | パナソニックIpマネジメント株式会社 | 溶接トランス |
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JPS6060172U (ja) * | 1983-09-13 | 1985-04-26 | 本田技研工業株式会社 | 整流器付トランス装置 |
JP2000223320A (ja) | 1999-01-28 | 2000-08-11 | Hitachi Ferrite Electronics Ltd | 大電流用トランス |
JP2002075737A (ja) * | 2000-08-24 | 2002-03-15 | Matsushita Electric Ind Co Ltd | 薄形トランスおよびその製造方法 |
WO2018193504A1 (ja) * | 2017-04-17 | 2018-10-25 | 三菱電機株式会社 | 平面トランス、レーザダイオード駆動用電源装置及びレーザ加工装置 |
Non-Patent Citations (1)
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US20240387097A1 (en) | 2024-11-21 |
EP4481775A1 (en) | 2024-12-25 |
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