JP6836359B2

JP6836359B2 - Transformers, transformer manufacturing methods

Info

Publication number: JP6836359B2
Application number: JP2016167930A
Authority: JP
Inventors: 卓彌服部; 茂生大森; 増田　剛; 剛増田; 圭吾陣田
Original assignee: Toshiba Industrial Products and Systems Corp
Current assignee: Toshiba Industrial Products and Systems Corp
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2021-03-03
Anticipated expiration: 2036-08-30
Also published as: JP2018037483A

Description

本発明の実施形態は、変圧器および変圧器の製造方法に関する。 Embodiments of the present invention relate to transformers and methods of manufacturing transformers.

例えば特許文献１に開示されているように、従来の変圧器は、鉄心の脚部の全てのコーナー部に段差を有しており、このような段差を有する鉄心に巻線が巻回された構成となっている。この構成によれば、鉄心を構成する金属材料の使用量を抑えることができ、経済的な変圧器を提供することができる。 For example, as disclosed in Patent Document 1, a conventional transformer has steps at all corners of the legs of the iron core, and a winding is wound around the iron core having such steps. It is composed. According to this configuration, the amount of the metal material constituting the iron core can be suppressed, and an economical transformer can be provided.

特開昭５５−６８１２号公報Japanese Unexamined Patent Publication No. 55-6812

従来構成の変圧器では、鉄心の脚部のコーナー部に段差が存在しているため、当該コーナー部における巻線の巻き膨れは生じにくいものの当該巻線の曲がり径が大きくなってしまい、変圧器の大型化を招いてしまう。そのため、変圧器の小型化を図るための技術が求められている。 In the transformer of the conventional configuration, since there is a step at the corner of the leg of the iron core, the winding swelling of the winding at the corner is unlikely to occur, but the bending diameter of the winding becomes large, and the transformer Will lead to an increase in size. Therefore, there is a demand for technology for reducing the size of transformers.

そこで、本実施形態は、鉄心の脚部のコーナー部における巻線の曲がり径を小さくすることができ、小型化を図ることができる変圧器および当該変圧器の製造方法を提供する。 Therefore, the present embodiment provides a transformer capable of reducing the bending diameter of the winding at the corner portion of the leg portion of the iron core and achieving miniaturization, and a method for manufacturing the transformer.

本実施形態に係る変圧器は、鉄心挿入孔部を有する巻線と、前記鉄心挿入孔部に挿入される鉄心と、前記巻線に設けられる低圧側口出し部と、を備え、前記鉄心の３つの脚部にそれぞれ前記巻線を巻回した変圧器である。前記鉄心は、複数枚の鉄心材が巻回されることにより構成される巻鉄心であって、前記脚部のコーナー部に段差を有する有段差面部と前記脚部のコーナー部に段差が無い無段差平面部を前記鉄心材の積層方向に直交する方向に沿う両端部に有する。前記巻線は、さらに高圧側口出し部を有するとともに、前記鉄心挿入孔部に巻型が備えられ、前記高圧側口出し部は、前記有段差面部に対向する位置に配置され、前記低圧側口出し部は、前記無段差平面部に対向する位置に配置されている。 Transformer according to the present embodiment, the winding having a core insertion hole portion, and the iron core to be inserted into the core insertion hole, and a low-pressure side lead section provided in the winding 3 of the core It is a transformer in which the winding is wound around each leg . The iron core is a wound iron core formed by winding a plurality of iron core materials, and there is no step between a stepped surface portion having a step at the corner portion of the leg portion and no step at the corner portion of the leg portion. Step flat portions are provided at both ends along a direction orthogonal to the laminating direction of the iron core material . The winding has a high-pressure side outlet, and the iron core insertion hole is provided with a winding mold. The high-pressure side outlet is arranged at a position facing the stepped surface portion, and the low-voltage side outlet is provided. Is arranged at a position facing the stepless flat surface portion.

本実施形態に係る変圧器の製造方法は、本実施形態に係る変圧器を製造する方法であって、前記鉄心挿入孔部に前記鉄心を挿入する鉄心挿入行程では、前記巻線を前記低圧側口出し部を下側にした状態で配置し、この状態で、前記鉄心挿入孔部に前記鉄心を挿入する。 The method for manufacturing a transformer according to the present embodiment is a method for manufacturing a transformer according to the present embodiment, and in the iron core insertion stroke in which the iron core is inserted into the iron core insertion hole portion, the winding is placed on the low voltage side. The iron core is arranged in a state where the mouth portion is on the lower side, and in this state, the iron core is inserted into the iron core insertion hole portion.

本実施形態に係る変圧器の構成例を概略的に示す図The figure which shows the structural example of the transformer which concerns on this embodiment schematicly. 本実施形態に係る変圧器の製造方法の一例を示す図（その１）The figure which shows an example of the manufacturing method of the transformer which concerns on this embodiment (the 1) 本実施形態に係る変圧器の製造方法の一例を示す図（その２）The figure which shows an example of the manufacturing method of the transformer which concerns on this embodiment (the 2) 本実施形態に係る変圧器の製造方法の一例を示す図（その３）The figure which shows an example of the manufacturing method of the transformer which concerns on this embodiment (the 3)

以下、変圧器および変圧器の製造方法に係る一実施形態について図面を参照しながら説明する。図１に例示する変圧器１０は、鉄心１１および巻線１２を備える。鉄心１１は、複数枚の鉄心材が巻回されることにより構成される、いわゆる巻鉄心である。巻線１２は、鉄心１１の脚部に巻回される。巻線１２は、その中央部に鉄心挿入孔部１３を有する。鉄心１１の脚部は、巻線１２の鉄心挿入孔部１３に挿入され、これにより、鉄心１１の脚部に巻線１２が巻回された変圧器１０が構成される。この場合、変圧器１０は、鉄心１１の３つの脚部に、それぞれ巻線１２を巻回した構成となっている。 Hereinafter, an embodiment relating to the transformer and the method for manufacturing the transformer will be described with reference to the drawings. The transformer 10 illustrated in FIG. 1 includes an iron core 11 and a winding 12. The iron core 11 is a so-called wound iron core, which is formed by winding a plurality of iron core materials. The winding 12 is wound around the leg of the iron core 11. The winding 12 has an iron core insertion hole 13 at the center thereof. The leg portion of the iron core 11 is inserted into the iron core insertion hole portion 13 of the winding 12, thereby forming a transformer 10 in which the winding 12 is wound around the leg portion of the iron core 11. In this case, the transformer 10 has a configuration in which windings 12 are wound around the three legs of the iron core 11.

鉄心１１は、脚部のコーナー部に段差を有する有段差面部１１ａ、および、脚部のコーナー部に段差を有さない平面状の無段差平面部１１ｂを備える。即ち、鉄心１１は、脚部の全てのコーナー部に段差を有する従来構成とは異なり、一部、この場合、少なくとも２つのコーナー部において段差を有さない構成となっている。 The iron core 11 includes a stepped surface portion 11a having a step at the corner portion of the leg portion and a flat non-stepped flat surface portion 11b having no step at the corner portion of the leg portion. That is, unlike the conventional configuration in which the iron core 11 has steps at all the corners of the legs, the iron core 11 has a configuration in which at least two corners do not have steps in some parts.

巻線１２は、低圧側口出し部１４を有する低圧側巻線、および、高圧側口出し部１５を有する高圧側巻線を備える。低圧側口出し部１４は、平板状に形成され、高圧側口出し部１５は線状、いわゆるタップ状に形成されている。低圧側口出し部１４は、帯状に延びる低圧側巻線の端部に例えば溶接などにより固定されている。高圧側口出し部１５は、線状に延びる高圧側巻線の途中において、当該高圧側巻線をステム状に引き出すことにより構成されている。 The winding 12 includes a low-voltage side winding having a low-voltage side outlet 14 and a high-voltage side winding having a high-voltage side outlet 15. The low-pressure side outlet portion 14 is formed in a flat plate shape, and the high-pressure side outlet portion 15 is formed in a linear shape, a so-called tap shape. The low-voltage side outlet portion 14 is fixed to the end of the low-voltage side winding extending in a strip shape, for example, by welding. The high-voltage side outlet portion 15 is configured by pulling out the high-voltage side winding in a stem shape in the middle of the high-voltage side winding extending linearly.

鉄心１１の脚部の周囲においては、低圧側巻線が内側に巻回され、その外側に高圧側巻線が巻回されている。巻線１２において、平板状の低圧側口出し部１４が配置される部分は、当該低圧側口出し部１４を帯状の低圧側巻線に沿わせて配置することができ、従って、平坦な状態とすることができる。一方、巻線１２において、タップ状の高圧側口出し部１５が配置される部分は、当該高圧側口出し部１５により凹凸が形成された状態となる。 Around the legs of the iron core 11, the low-voltage side winding is wound inward, and the high-voltage side winding is wound outside the winding. In the winding 12, the portion where the flat plate-shaped low-voltage side outlet 14 is arranged can be arranged along the strip-shaped low-voltage side winding, and thus is kept flat. be able to. On the other hand, in the winding 12, the portion where the tap-shaped high-voltage side outlet portion 15 is arranged is in a state where unevenness is formed by the high-voltage side outlet portion 15.

巻線１２の鉄心挿入孔部１３には、巻型１６が備えられる。巻型１６は、巻型本体部１７および絶縁部１８を備える。巻型本体部１７は、例えば鋼材で構成されている。巻型本体部１７は、鉄心挿入孔部１３の全周にわたって設けられておらず、その一部が開放された開放部１７ａとなっている。絶縁部１８は、例えば絶縁材料で構成されている。絶縁部１８は、平板状に構成されており、巻型本体部１７の開放部１７ａを塞いでいる。鋼材からなる巻型を鉄心挿入孔部１３の全周にわたって連続的に設けてしまうと、鉄心１１を通る磁束により当該巻型１６をループするような電流が発生する。そのため、巻型１６の全てを鋼材で形成するのではなく、その一部を絶縁材料で構成することにより、巻型１６に電流がループするように流れてしまうことを回避することができる。 A winding mold 16 is provided in the iron core insertion hole 13 of the winding 12. The winding mold 16 includes a winding mold main body portion 17 and an insulating portion 18. The winding type main body 17 is made of, for example, a steel material. The winding type main body portion 17 is not provided over the entire circumference of the iron core insertion hole portion 13, and is an open portion 17a in which a part thereof is open. The insulating portion 18 is made of, for example, an insulating material. The insulating portion 18 is formed in a flat plate shape and closes the open portion 17a of the winding type main body portion 17. If a winding die made of a steel material is continuously provided over the entire circumference of the iron core insertion hole portion 13, a current that loops the winding die 16 is generated by the magnetic flux passing through the iron core 11. Therefore, it is possible to prevent the current from flowing in a loop through the winding die 16 by forming a part of the winding die 16 with an insulating material instead of forming the entire winding die 16 from a steel material.

巻型本体部１７の２つのコーナー部、この場合、開放部１７ａとは反対側の２つのコーナー部は、ほぼ直角に折り曲げられており、これにより、これらコーナー部の曲がり径が、他のコーナー部、つまり、開放部１７ａ側の２つのコーナー部の曲がり径よりも小さくなっている。これにより、巻型１６は、コーナー部の曲がり径が大きく、円弧状に形成された円弧状面部１６ａ、および、コーナー部の曲がり径が小さく、段差を有さない平面状の無段差平面部１６ｂを有する。このように構成される巻型１６は、上部がドーム状、下部が矩形状となり、従って、この巻型１６に巻回される巻線１２の鉄心挿入孔部１３も、上部がドーム状、下部が矩形状となる。 The two corners of the winding main body 17, in this case, the two corners on the opposite side of the open portion 17a, are bent at substantially right angles, whereby the bending diameter of these corners becomes the other corners. The diameter of the portion, that is, the two corner portions on the open portion 17a side is smaller than the bending diameter. As a result, the winding mold 16 has an arcuate surface portion 16a formed in an arc shape with a large curved diameter at the corner portion and a flat non-stepped flat surface portion 16b having a small curved diameter at the corner portion and having no step. Has. The winding mold 16 configured in this way has a dome shape at the upper portion and a rectangular shape at the lower portion. Therefore, the iron core insertion hole 13 of the winding 12 wound around the winding mold 16 also has a dome shape at the upper portion and a lower portion. Becomes rectangular.

そして、変圧器１０において、高圧側口出し部１５は、鉄心１１の有段差面部１１ａおよび巻型１６の円弧状面部１６ａに対向する位置に配置されている。一方、低圧側口出し部１４は、鉄心１１の無段差平面部１１ｂおよび巻型１６の無段差平面部１６ｂに対向する位置に配置されている。変圧器１０の周囲において、鉄心１１の無段差平面部１１ｂを構成する２つのコーナー部および巻型１６の無段差平面部１６ｂを構成する２つのコーナー部は、何れもほぼ直角になっている。従って、このようなほぼ直角なコーナー部の周辺においては、巻線１２をコーナー部に沿ってほぼ直角に曲げることが困難であり、鉄心１１および巻型１６に対し巻線１２が巻き膨れることにより空間が形成される。そこで、本実施形態に係る変圧器１０では、このように巻線１２の巻き膨れにより形成される空間内に低圧側口出し部１４を収容している。 Then, in the transformer 10, the high-voltage side outlet portion 15 is arranged at a position facing the stepped surface portion 11a of the iron core 11 and the arcuate surface portion 16a of the winding mold 16. On the other hand, the low-pressure side opening portion 14 is arranged at a position facing the stepless flat surface portion 11b of the iron core 11 and the stepless flat surface portion 16b of the winding mold 16. Around the transformer 10, the two corners forming the stepless flat surface portion 11b of the iron core 11 and the two corner portions forming the stepless flat surface portion 16b of the winding mold 16 are both substantially at right angles. Therefore, it is difficult to bend the winding 12 at a substantially right angle along the corner around such a substantially right-angled corner portion, and the winding 12 swells with respect to the iron core 11 and the winding mold 16. A space is formed. Therefore, in the transformer 10 according to the present embodiment, the low-voltage side outlet portion 14 is housed in the space formed by the winding swelling of the winding 12 in this way.

次に、変圧器１０の製造方法の一例について説明する。図２に例示するように、まず、巻線１２の巻回行程では、巻型１６の周囲に巻線１２を巻回する。このとき、まず、巻型１６の周囲に低圧側巻線を巻回し、続いて、その外側に高圧側巻線を巻回していく。また、高圧側巻線を巻回する際には、高圧側口出し部１５を低圧側口出し部１４とは反対側の部位に配置する。次に、図３に例示するように、巻線１２の鉄心挿入孔部１３に鉄心１１の脚部を挿入する鉄心挿入行程では、巻線１２を、低圧側口出し部１４を下側にした状態で、平坦な鉄心挿入台１００の上に配置する。そして、例えば鋼材からなる板状の鉄心挿入用の治具１０１を巻型１６の無段差平面部１６ｂの高さに合わせて配置する。これにより、鉄心挿入用の治具１０１と巻型１６の無段差平面部１６ｂとからなる面一な平面が形成される。このとき、巻型１６の無段差平面部１６ｂが段差の無い平面状であることから、当該無段差平面部１６ｂの高さに、板状の鉄心挿入用の治具１０１を合わせる調整作業を容易に行うことができる。 Next, an example of a method for manufacturing the transformer 10 will be described. As illustrated in FIG. 2, first, in the winding stroke of the winding 12, the winding 12 is wound around the winding mold 16. At this time, first, the low-voltage side winding is wound around the winding mold 16, and then the high-voltage side winding is wound around the outside. Further, when winding the high-voltage side winding, the high-voltage side outlet portion 15 is arranged at a portion opposite to the low-voltage side outlet portion 14. Next, as illustrated in FIG. 3, in the iron core insertion stroke in which the leg portion of the iron core 11 is inserted into the iron core insertion hole portion 13 of the winding 12, the winding 12 is in a state where the low-voltage side opening portion 14 is on the lower side. Then, it is arranged on a flat iron core insertion table 100. Then, for example, a plate-shaped iron core insertion jig 101 made of a steel material is arranged according to the height of the stepless flat surface portion 16b of the winding mold 16. As a result, a flush flat surface including the jig 101 for inserting the iron core and the stepless flat surface portion 16b of the winding mold 16 is formed. At this time, since the stepless flat surface portion 16b of the winding mold 16 is a flat surface without a step, it is easy to adjust the plate-shaped iron core insertion jig 101 to the height of the stepless flat surface portion 16b. Can be done.

そして、図４に例示するように、この状態で、鉄心挿入用の治具１０１および巻型１６の無段差平面部１６ｂからなる面一な平面上を滑らせるようにして、鉄心１１を構成する鉄心材を鉄心挿入孔部１３内に挿入していく。これにより、図１に例示する変圧器１０、即ち、巻線１２の鉄心挿入孔部１３に鉄心１１の脚部が挿入された変圧器１０が製造される。 Then, as illustrated in FIG. 4, in this state, the iron core 11 is configured by sliding on a flush plane including the jig 101 for inserting the iron core and the stepless flat surface portion 16b of the winding mold 16. The iron core material is inserted into the iron core insertion hole 13. As a result, the transformer 10 illustrated in FIG. 1, that is, the transformer 10 in which the leg portion of the iron core 11 is inserted into the iron core insertion hole portion 13 of the winding 12, is manufactured.

本実施形態に係る変圧器１０によれば、鉄心１１は、段差が無い平面状の無段差平面部１１ｂを有しており、巻線１２の低圧側口出し部１４は、鉄心１１の無段差平面部１１ｂに対向する位置に配置されている。この構成によれば、少なくとも、鉄心１１の無段差平面部１１ｂ側のコーナー部における巻線１２の曲がり径を小さくすることができ、特に鉄心１１の無段差平面部１１ｂ側において変圧器１０の小型化を図ることができる。 According to the transformer 10 according to the present embodiment, the iron core 11 has a flat flat surface portion 11b having no step, and the low-voltage side opening portion 14 of the winding 12 has a flat surface without step of the iron core 11. It is arranged at a position facing the portion 11b. According to this configuration, at least the bending diameter of the winding 12 at the corner portion on the stepless flat surface portion 11b side of the iron core 11 can be reduced, and the transformer 10 is particularly small on the stepless flat surface portion 11b side of the iron core 11. Can be achieved.

また、変圧器１０によれば、鉄心１１の無段差平面部１１ｂ側のコーナー部における巻線１２の曲がり径が小さくなることに伴い、鉄心１１の無段差平面部１１ｂに対向する部位において巻線１２の巻き膨れが生じやすくなる。そのため、鉄心１１の無段差平面部１１ｂに対向する部位、つまり、巻線１２の巻き膨れにより形成される空間内に低圧側口出し部１４を収容するようにした。これにより、巻線１２の巻き膨れに伴い形成される空間を利用して低圧側口出し部１４を配置することができ、低圧側口出し部１４を配置するためのスペースを特別に設ける必要が無く、変圧器１０の小型化を図ることができる。 Further, according to the transformer 10, as the bending diameter of the winding 12 at the corner portion on the stepless flat surface portion 11b side of the iron core 11 becomes smaller, the winding is performed at the portion of the iron core 11 facing the stepless flat surface portion 11b. Twelve swelling is likely to occur. Therefore, the low-voltage side opening portion 14 is accommodated in the portion of the iron core 11 facing the stepless flat surface portion 11b, that is, in the space formed by the winding swelling of the winding 12. As a result, the low-voltage side outlet portion 14 can be arranged by utilizing the space formed by the winding swelling of the winding 12, and there is no need to provide a special space for arranging the low-voltage side outlet portion 14. The size of the transformer 10 can be reduced.

また、本実施形態に係る変圧器１０の製造方法によれば、鉄心１１を構成する鉄心材を鉄心挿入孔部１３に挿入する鉄心挿入行程において、巻線１２を、低圧側口出し部１４を下側にした状態で配置し、この状態で、鉄心１１を構成する鉄心材を鉄心挿入孔部１３に挿入する。即ち、巻線１２において低圧側口出し部１４が配置される部位は、巻型１６の無段差平面部１６ｂつまり段差を有さない平坦な部分に対向する部位であり、また、低圧側口出し部１４が平坦であることから、当該低圧側口出し部１４が配置される巻線１２の部位も平坦となる。よって、巻線１２および巻型１６の平坦な部位を下側にした状態で、鉄心１１を構成する鉄心材を平坦面上で滑らせるようにして挿入することができ、鉄心１１の鉄心材の挿入作業の作業性を向上することができる。また、巻型１６の無段差平面部１６ｂは、鋼材からなる巻型本体部１７で構成されているので、挿入される鉄心１１の鉄心材が滑りやすく、従って、鉄心材の挿入作業の作業性を一層向上することができる。 Further, according to the method of manufacturing the transformer 10 according to the present embodiment, in the iron core insertion process of inserting the iron core material constituting the iron core 11 into the iron core insertion hole portion 13, the winding 12 is lowered and the low voltage side outlet portion 14 is lowered. It is arranged on the side, and in this state, the iron core material constituting the iron core 11 is inserted into the iron core insertion hole portion 13. That is, the portion of the winding 12 where the low-voltage side outlet portion 14 is arranged is a portion of the winding mold 16 that faces the stepless flat surface portion 16b, that is, the flat portion having no step, and the low-voltage side outlet portion 14 Is flat, so that the portion of the winding 12 on which the low-voltage side opening portion 14 is arranged is also flat. Therefore, with the flat portions of the winding 12 and the winding mold 16 facing downward, the iron core material constituting the iron core 11 can be inserted by sliding on the flat surface, and the iron core material of the iron core 11 can be inserted. The workability of the insertion work can be improved. Further, since the stepless flat surface portion 16b of the winding mold 16 is composed of the winding mold main body portion 17 made of a steel material, the iron core material of the iron core 11 to be inserted is slippery. Can be further improved.

また、本実施形態に係る変圧器１０の製造方法によれば、鉄心１１の無段差平面部１１ｂ側には段差を設ける必要が無いので、段差を設けるための治具を不要とすることができ、組立性の向上を図ることができる。また、巻型１６の無段差平面部１６ｂが段差の無い平面状であることから、当該無段差平面部１６ｂの上面に鉄心材を配置することで、鉄心１１の無段差平面部１１ｂを形成することができ、無段差平面部１１ｂを有する鉄心１１を容易に形成することができる。 Further, according to the method of manufacturing the transformer 10 according to the present embodiment, it is not necessary to provide a step on the stepless flat surface portion 11b side of the iron core 11, so that a jig for providing the step can be eliminated. , It is possible to improve the assembling property. Further, since the stepless flat surface portion 16b of the winding mold 16 is a flat surface without a step, the iron core material is arranged on the upper surface of the stepless flat surface portion 16b to form the stepless flat surface portion 11b of the iron core 11. Therefore, the iron core 11 having the stepless flat surface portion 11b can be easily formed.

なお、本実施形態は、上述した一実施形態に限られるものではなく、例えば、次のように拡張または変更することができる。例えば、鉄心１１は、脚部の全てのコーナー部について段差を有さない構成としてもよい。また、鉄心挿入用の治具１０１は、巻型１６に巻回された巻線１２が挿入される孔部を有する１枚の板から構成してもよいし、巻型１６に巻回された巻線１２を、鉄心挿入孔部１３の貫通方向の両側から挟む２枚の板から構成してもよい。 The present embodiment is not limited to the above-described embodiment, and can be extended or modified as follows, for example. For example, the iron core 11 may be configured so as not to have a step at all the corners of the legs. Further, the jig 101 for inserting the iron core may be composed of one plate having a hole into which the winding 12 wound around the winding mold 16 is inserted, or may be wound around the winding mold 16. The winding 12 may be composed of two plates sandwiching the iron core insertion hole 13 from both sides in the penetrating direction.

本実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。本実施形態およびその変形は、発明の範囲および要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 This embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The present embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

図面中、１０は変圧器、１１は鉄心、１１ｂは無段差平面部、１２は巻線、１３は鉄心挿入孔部、１４は低圧側口出し部を示す。 In the drawing, 10 is a transformer, 11 is an iron core, 11b is a stepless flat surface portion, 12 is a winding, 13 is an iron core insertion hole portion, and 14 is a low-voltage side outlet portion.

Claims

A winding with an iron core insertion hole and
The iron core inserted into the iron core insertion hole and
A transformer provided with a low-voltage side outlet provided on the winding, and the winding is wound around each of the three legs of the iron core.
The iron core is a wound iron core formed by winding a plurality of iron core materials, and there is no step between a stepped surface portion having a step at the corner portion of the leg portion and no step at the corner portion of the leg portion. The step flat portion is provided at both ends along the direction orthogonal to the laminating direction of the iron core material .
The winding further has a high-voltage side opening portion, and the iron core insertion hole portion is provided with a winding mold.
The high-pressure side opening portion is arranged at a position facing the stepped surface portion.
The low-voltage side outlet portion is a transformer arranged at a position facing the stepless flat surface portion.

The transformer according to claim 1, wherein the low-voltage side outlet portion is housed in a space formed by winding and swelling the winding around the iron core.

A winding with an iron core insertion hole and
The iron core inserted into the iron core insertion hole and
A low-voltage side outlet provided on the winding is provided.
The iron core has a stepped surface portion having a step and a stepless flat surface portion having no step.
The low-voltage side outlet portion is a method for manufacturing a transformer arranged at a position facing the stepless flat surface portion.
In the iron core insertion stroke of inserting the iron core into the iron core insertion hole portion, the winding is arranged with the low-voltage side opening portion facing downward, and in this state, the iron core is inserted into the iron core insertion hole portion. How to make a transformer.