JP2016143687A

JP2016143687A - Iron core for transformer, and transformer using the same

Info

Publication number: JP2016143687A
Application number: JP2015016324A
Authority: JP
Inventors: 雄大平野; Takehiro Hirano; 緒形　利夫; Toshio Ogata; 利夫緒形
Original assignee: Hitachi Industrial Equipment Systems Co Ltd
Current assignee: Hitachi Industrial Equipment Systems Co Ltd
Priority date: 2015-01-30
Filing date: 2015-01-30
Publication date: 2016-08-08

Abstract

PROBLEM TO BE SOLVED: To solve the following problem: in order to assemble a transformer using a folded ion core, a dimension between an iron core and an inner coil is required to be enlarged in comparison with the case using a wound core, and the dimension of the transformer is enlarged thereby.SOLUTION: Folded parts formed in a corner portion on the lap part side of a folded iron core is made larger in number than folded parts formed at a corner portion on the yoke side. Thereby, linearity becomes higher when a magnetic steel sheet is elongated during insertion of the iron core, assembling work can be thereby easily performed without enlarging the dimension between the iron core and the inner coil, and a transformer can be miniaturized. Also, loss deterioration attendant on increase of the number of folding times can be minimized.SELECTED DRAWING: Figure 1

Description

本発明は、変圧器用鉄心及びこれを用いた変圧器に関する。 The present invention relates to a transformer core and a transformer using the same.

本技術分野の背景技術として、特開２００４−２５３６７７号公報（特許文献１）がある。この公報には、「全体をコンパクトにするため、短辺方向の最小化を可能とし、また、最内周の１単位積層体の枚数を多くする事により１単位積層体の全体構成数を少なくし、コイルと組み合わせる回数を少なくして巻鉄心の低価格化とする変圧器及び巻鉄心用積層体の製造装置を提供する。薄板状の磁性材料３１を１枚１枚所定の量ずらしながら所定の枚数積層するとともに両端部を矩形の短辺となるよう突き合わせた単位積層体を３個以上積み重ねた矩形状の巻鉄心を備える変圧器において、ずらし量が、巻鉄心半径方向の中間の単位積層体４５と比較して、内側の単位積層体４４は小であり、かつ、外側の単位積層体４６は大である。」と記載されており、また図３に巻鉄心とコイルの組立説明図が記載されている。 As a background art of this technical field, there is JP-A-2004-253677 (Patent Document 1). According to this publication, “in order to make the whole compact, minimization in the short side direction is possible, and the total number of one unit laminate is reduced by increasing the number of one unit laminate on the innermost circumference. The present invention provides a transformer and a manufacturing apparatus for a laminated body for a wound iron core that reduce the number of times of combining with a coil and reduce the price of a wound iron core. In a transformer provided with a rectangular wound core in which three or more unit laminated bodies are laminated so that both ends thereof become rectangular short sides are stacked, the amount of shift is an intermediate unit lamination in the radial direction of the wound core Compared with the body 45, the inner unit laminated body 44 is smaller and the outer unit laminated body 46 is larger. "Also, FIG. 3 is an assembly explanatory diagram of the wound core and the coil. Is described.

特開２００４−２５３６７７Japanese Patent Application Laid-Open No. 2004-253677

従来の巻鉄心のコーナー部における曲面形状を、折り曲げられた形状に置き換えた折り曲げ鉄心を開示した文献は無く、この折り曲げ鉄心をコイルに挿入する際の組立性を向上する方法については一切開示されていなかった。本発明は、コイルへの挿入をより容易にしつつ、鉄心特性の悪化を低減した折り曲げ鉄心、及びこれを用いた変圧器を提供することを目的とする。 There is no document disclosing a bent core in which the curved surface shape in the corner portion of a conventional wound core is replaced with a bent shape, and no method for improving the assemblability when inserting the bent core into a coil is disclosed. There wasn't. An object of this invention is to provide the bending iron core which made the insertion to a coil easier, and reduced deterioration of the iron core characteristic, and a transformer using the same.

上記課題を解決するために、例えば特許請求の範囲に記載の構成を採用する。本願は上記課題を解決する手段を複数含んでいるが、その一例を挙げるならば、鉄心と、前記鉄心が挿入されるコイルと、を備えた変圧器であって、鉄心は、ラップ部側のコーナー部に形成されている折曲部の数が、ヨーク部側のコーナー部に形成されている折曲部の数より多いことを特徴とする。 In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example, a transformer including an iron core and a coil into which the iron core is inserted, the iron core on the lap portion side is provided. The number of bent portions formed in the corner portion is larger than the number of bent portions formed in the corner portion on the yoke portion side.

本発明によれば、鉄心とコイルとの組立性を向上し、かつ鉄心の特性悪化が抑制された変圧器を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the assembly property of an iron core and a coil can be improved, and the transformer by which the characteristic deterioration of the iron core was suppressed can be provided.

本発明を用いた単相変圧器の正面図Front view of a single-phase transformer using the present invention 図１に示す変圧器のコイル及び鉄心の断面図Cross section of coil and iron core of transformer shown in FIG. コーナー部の折り曲げ角度を４５度とした鉄心の正面図Front view of the iron core with the corner bent at 45 degrees コーナー部の折り曲げ角度を３０度とした鉄心の正面図Front view of the iron core with the corner bent at 30 degrees 折り曲げ角度を４５度とした鉄心と３０度とした鉄心の励磁特性を示す図The figure which shows the excitation characteristic of the iron core which made the bending angle 45 degrees and the iron core which made 30 degrees ヨーク部側の折り曲げ箇所を２か所（折り曲げ角度４５度）、ラップ部側の折り曲げ箇所を３か所（折り曲げ角度３０度）とした折り曲げ鉄心の正面図Front view of a bent iron core with two bent portions on the yoke side (bending angle 45 degrees) and three bent portions on the lap side (fold angle 30 degrees) ヨーク部側を９０度、ラップ部側を３０度で折り曲げた鉄心の正面図Front view of iron core bent at 90 degrees on yoke side and 30 degrees on lap side

以下、本発明の実施例について図に基づき説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１に、本実施例の変圧器の正面図を示す。まず、従来の巻鉄心のコーナー部における曲面形状を、図３の破線又は一点鎖線の領域で示すように折り曲げられた形状に置き換えた巻鉄心を、「折り曲げ鉄心」と呼ぶこととする。折り曲げ鉄心はコーナー部が曲面形状の巻鉄心に比べて加工歪みが小さいという利点がある。本実施例の変圧器は、コイル３と、鉄心窓内コイル支え４を介してコイルを支持する折り曲げ鉄心５と、それらを支持する上部金具６及び下部金具７と、これら上下部金具を連結する当板８と、変圧器本体２下部に設置されて変圧器を基盤上に固定するベース９とを有している。詳しくは後述するが、破線で示した折り曲げ鉄心５はヨーク部側のコーナー部では折曲部を２か所備え、ラップ部側のコーナー部では折曲部を３か所備えている。 In FIG. 1, the front view of the transformer of a present Example is shown. First, a wound core in which the curved surface shape at the corner portion of the conventional wound core is replaced with a bent shape as shown by a broken line or an alternate long and short dash line in FIG. 3 is referred to as a “folded core”. The bent iron core has an advantage that the processing distortion is smaller than that of the wound iron core having a curved corner portion. The transformer of the present embodiment connects the upper and lower metal parts to the coil 3, the bent iron core 5 that supports the coil via the coil support 4 in the iron window, the upper metal part 6 and the lower metal part 7 that support them. This plate 8 has a base 9 which is installed at the bottom of the transformer body 2 and fixes the transformer on the base. As will be described in detail later, the bending iron core 5 indicated by a broken line includes two bent portions at the corner portion on the yoke portion side and three bent portions at the corner portion on the lap portion side.

図２に、図１の１０−１０’断面を示す。外コイル１２の内側に内コイル１３が配置されており、更に内側に折り曲げ鉄心５が挿入されている。この折り曲げ鉄心５は薄帯形状の鉄心材料を積層して巻かれて形成されている。 FIG. 2 shows a cross section taken along the line 10-10 'of FIG. The inner coil 13 is disposed inside the outer coil 12, and the bent iron core 5 is inserted further inside. The bent iron core 5 is formed by laminating and winding thin ribbon-like iron core materials.

コーナー部が曲面形状となっている従来の巻鉄心では、積層した状態の巻鉄心を、その開放端側からまとめてコイルに挿入する方法が一般的である。一方、本実施例のような折り曲げ鉄心５では、内コイル１３に挿入する際、積層されて形成されている折り曲げ鉄心５全体のうち内側に配置される鉄心から順次コイルに挿入していく。図２であれば、折り曲げ鉄心５の右側から左側に向けて順次鉄心を挿入していく。このように、折り曲げ鉄心と従来の巻鉄心とではコイルへの挿入方法が異なっており、折り曲げ鉄心の挿入には、従来の巻鉄心には無い課題がある。即ち、折り曲げ鉄心５を挿入する場合、挿入開始直後には鉄心を挿入するための空間（鉄心−内コイル間寸法１１）が比較的大きく空いているため、鉄心を挿入するのは比較的容易である。しかしながら、鉄心材料の挿入が進むにつれ、鉄心材料を挿入するための空間（鉄心−内コイル間寸法１１）が小さくなるので、折曲部が内コイル１３の内側に干渉しやすくなり、挿入が難しくなる。 In a conventional wound iron core having a curved corner, a general method is to insert the laminated cores in a stacked state from the open end side into a coil. On the other hand, in the folded iron core 5 as in the present embodiment, when inserted into the inner coil 13, the iron cores arranged on the inner side of the entire folded iron core 5 formed by being stacked are sequentially inserted into the coil. In FIG. 2, the iron cores are sequentially inserted from the right side to the left side of the bent iron core 5. As described above, the bending iron core and the conventional wound iron core have different insertion methods into the coil, and the insertion of the bent iron core has a problem that the conventional wound iron core does not have. That is, when inserting the bent iron core 5, the space for inserting the iron core (dimension 11 between the iron core and the inner coil) is relatively large immediately after the start of insertion, and therefore it is relatively easy to insert the iron core. is there. However, as the insertion of the iron core material proceeds, the space for inserting the iron core material (dimension 11 between the iron core and the inner coil) becomes smaller. Therefore, the bent portion easily interferes with the inner side of the inner coil 13 and is difficult to insert. Become.

この対策として、折り曲げ鉄心５と内コイル１３との間に十分な隙間を開けておけるよう、鉄心の厚さよりもかなり大きくなるようにコイルの内径を設計する方法も考えられるが、この方法ではコイルが大型化し、変圧器自体も大型化してしまう。 As a countermeasure, a method of designing the inner diameter of the coil so as to be considerably larger than the thickness of the iron core so that a sufficient gap can be opened between the bent iron core 5 and the inner coil 13 can be considered. Will increase in size, and the transformer itself will also increase in size.

図３に、折り曲げ鉄心５のヨーク部側のコーナー部１４とラップ部側のコーナー部１５に形成された折曲部の折曲角度をそれぞれ４５度として、折曲部を２か所備えた鉄心を示す。このように、従来はヨーク部側のコーナー部１４とラップ部側のコーナー部１５の折り曲げ回数は同じ回数であった。 FIG. 3 shows an iron core having two bent portions, each of which has a bent angle of 45 degrees formed at the corner portion 14 on the yoke portion side and the corner portion 15 on the lap portion side of the bent iron core 5. Indicates. Thus, conventionally, the number of times of bending of the corner portion 14 on the yoke portion side and the corner portion 15 on the lap portion side is the same.

図４に、折り曲げ鉄心５のヨーク部側のコーナー部１４とラップ部側のコーナー部１５に形成された折曲部の折曲角度をそれぞれ３０度として、折曲部を３か所備えた鉄心を示す。この場合、４５度の場合と比較して電磁鋼板を伸ばした際の直線度が高く、鉄心−内コイル間寸法１１が小さくても鉄心挿入作業を比較的容易に行うことができる。また鉄心とコイルの接触による破損を低減することができる。 FIG. 4 shows an iron core having three bent portions, each of which has a bent angle of 30 degrees formed at the corner portion 14 on the yoke portion side and the corner portion 15 on the lap portion side of the bent iron core 5. Indicates. In this case, the linearity when the electromagnetic steel sheet is extended is higher than that in the case of 45 degrees, and the core insertion work can be performed relatively easily even if the core-inner coil dimension 11 is small. Moreover, the damage by contact with an iron core and a coil can be reduced.

図５に、折曲部の角度を４５度とした場合と、３０度とした場合の励磁特性を示す。折曲部の角度を３０度とした場合の損失が、折曲部の角度を４５度とした場合の損失よりも高いことが示されている。折り曲げ回数を増やすほど歪み箇所が増えて損失が大きくなると考えられる。 FIG. 5 shows excitation characteristics when the angle of the bent portion is 45 degrees and 30 degrees. It is shown that the loss when the angle of the bent portion is 30 degrees is higher than the loss when the angle of the bent portion is 45 degrees. It is considered that as the number of bendings increases, the number of distortion points increases and the loss increases.

図６に、本実施例における変圧器の折り曲げ鉄心５を示す。図５の説明で述べたように、折り曲げ回数が増えるほど損失が大きくなる。また、ヨーク部側のコーナー部は鉄心挿入に際してコイル内側を通過することはなく、ヨーク部側のコーナー部に形成された折曲部の数が鉄心挿入の容易性に与える影響は小さい。これらを考慮し、本実施例における折り曲げ鉄心５では、ヨーク部側のコーナー部では折曲部を２か所、ラップ部側のコーナー部では折曲部を３か所とし、ヨーク部側の折曲部を４５度、ラップ部１６側の折曲部を３０度としている。このように、組立性向上への影響が小さいヨーク部側のコーナー部での折り曲げ箇所を２か所に制限したことにより損失悪化を抑制することができ、また組立性向上に影響が大きいラップ部側のコーナー部での折り曲げ箇所を３か所としたことで、組立性を低下させることなく変圧器を小型化することができる。図７には、折り曲げ鉄心５のヨーク部側の折曲部を９０度、ラップ部１６側の折曲部を３０度とした鉄心を示す。この場合はヨーク部側のコーナー部の折り曲げ箇所が１か所であるため、２か所の場合よりも更に損失低下を抑制することができる。本発明は電磁鋼板を用いた鉄心を例に挙げて説明したが、これに限定されるものではなく、例えばアモルファス鉄心にも適用することができる。また、モールド変圧器、油入変圧器など、種々の変圧器に適用することができる。 In FIG. 6, the bending iron core 5 of the transformer in a present Example is shown. As described in the explanation of FIG. 5, the loss increases as the number of bending increases. Further, the corner portion on the yoke portion side does not pass through the inside of the coil when the iron core is inserted, and the number of bent portions formed in the corner portion on the yoke portion side has little influence on the ease of iron core insertion. Considering these, in the folded iron core 5 in the present embodiment, there are two bent portions in the corner portion on the yoke portion side, and three bent portions in the corner portion on the lap portion side, and the folded portion on the yoke portion side. The bent part is 45 degrees, and the bent part on the lap part 16 side is 30 degrees. In this way, the loss of deterioration can be suppressed by limiting the number of bent portions at the corner on the yoke portion side, which has a small influence on the improvement of assembly, and the wrap portion has a large influence on the improvement of assembly. Since the number of bent portions at the corner portion on the side is three, the transformer can be miniaturized without degrading the assemblability. FIG. 7 shows an iron core in which the bent part on the yoke part side of the bent iron core 5 is 90 degrees and the bent part on the wrap part 16 side is 30 degrees. In this case, since the number of bent portions of the corner portion on the yoke portion side is one, the loss reduction can be further suppressed as compared with the case of two locations. The present invention has been described by taking an iron core using an electromagnetic steel sheet as an example. However, the present invention is not limited to this, and can be applied to an amorphous iron core, for example. Moreover, it can apply to various transformers, such as a mold transformer and an oil-filled transformer.

１…変圧器
２…変圧器本体
３…コイル
４…鉄心窓内コイル支え
５…折り曲げ鉄心
６…上部金具
７…下部金具
８…当板
９…ベース
１０、１０’…断面指示
１１…鉄心−内コイル間寸法
１２…外コイル
１３…内コイル
１４…ヨーク部側コーナー部
１５…ラップ部側コーナー部
１６…ラップ部 DESCRIPTION OF SYMBOLS 1 ... Transformer 2 ... Transformer main body 3 ... Coil 4 ... Coil support in an iron core window 5 ... Bending iron core 6 ... Upper metal fitting 7 ... Lower metal fitting 8 ... This plate 9 ... Base 10, 10 '... Section indication 11 ... Iron core inside Dimensions between coils 12 ... Outer coil 13 ... Inner coil 14 ... York part side corner part 15 ... Lap part side corner part 16 ... Lap part

Claims

鉄心と、前記鉄心が挿入されるコイルと、を備えた変圧器であって、
前記鉄心は、ラップ部側のコーナー部に形成されている折曲部の数が、ヨーク部側のコーナー部に形成されている折曲部の数より多いことを特徴とする変圧器。 A transformer comprising an iron core and a coil into which the iron core is inserted,
In the transformer, the number of bent portions formed in the corner portion on the lap portion side of the iron core is larger than the number of bent portions formed in the corner portion on the yoke portion side.

請求項１記載の変圧器であって、
前記鉄心は、ラップ部側のコーナー部には折曲部を３か所備えることを特徴とする変圧器。 The transformer of claim 1,
The iron core is provided with three bent portions at a corner portion on a lap portion side.

請求項２記載の変圧器であって、
前記鉄心の折曲部は、それぞれ３０度であることを特徴とする変圧器。 The transformer according to claim 2,
Each of the bent portions of the iron core is 30 degrees.

請求項１記載の変圧器であって、
前記鉄心は、ラップ部側のコーナー部に形成されている折曲部の角度が、ヨーク部側のコーナー部に形成されている折曲部の角度より小さいことを特徴とする変圧器。 The transformer of claim 1,
In the iron core, the angle of the bent portion formed in the corner portion on the lap portion side is smaller than the angle of the bent portion formed in the corner portion on the yoke portion side.