JPS60158609A - Transformer core - Google Patents

Abstract

PURPOSE:To reduce an iron loss at the junction part of a transformer core by a method wherein the junction gaps of an oblique junction part at the edge parts of a leg part core and a yoke are shifted in a step type in the longitudinal direction of steel plates, and the positions of the respective junction gaps thereof are made to be different from each other in the longitudinal direction of the steel plates. CONSTITUTION:The junction part of the steel plates 1U of a leg part core and the steel plates 2 of a yoke are constructed by alternately laminating repetitiously with a first step type junction part group L1 and a second step type junction part goup L2 constructing a lamination unit L in the place between the referential positions A-A', B-B'. At the junction part groups L1, L2 thereof, junction gaps 4 between the steel plates 1U and the steel plates 2 of the respective layers are arranged being shifted in a step type in order at the equal intervals l1, l2 in the longitudinal direction of the steel plates, and the positions of the respective junction gaps 4 of the junction part group L1 and the positions of the respective junction gaps 4 of the junction part group L2 are shifted by the amount l3 in the longitudinal direction of the steel plates. Accordingly, disorder of the current of magnetic flux at the parts of the junction gaps 4 is improved, a loss to be generated can be reduced, and moreover the lap part between the adjoining steel plates becomes to about two times of the usual example, and mechanical strength of the core at the junction part can be enhanced.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は脚部鉄心と継鉄とを斜め接合する変圧器鉄心、
特にその斜め接合部の構成に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a transformer core in which a leg core and a yoke are diagonally joined;
In particular, it relates to the structure of the diagonal joint.

〔発明の背景〕[Background of the invention]

変圧器鉄心に発生する損失には、積層鋼板内を流れる磁
束による渦流損やヒステリシス損、更には鋼板接合部の
ギャップ部分における磁束の流れの乱れによる損失など
がある。近年変圧器が益々大容量化するのに伴ない前記
鉄心の損失を低減する要請が強く呼ばれておシ、その対
策の一つとして鋼板接合部での発生損失を低減する目的
で種々の鋼板の接合方式の提案がなされている。Losses that occur in transformer cores include eddy current loss and hysteresis loss due to magnetic flux flowing within laminated steel plates, and loss due to disturbance of magnetic flux flow in gaps between steel plate joints. In recent years, as the capacity of transformers has become larger and larger, there has been a strong demand for reducing the loss in the iron core.As one of the countermeasures, various steel plates have been developed to reduce the loss generated at the joints of steel plates. Several joining methods have been proposed.

第１図は三脚構成の変圧器鉄心の鋼板接合例を示すもの
で、脚部鉄心を形成する鋼板工と、上下継鉄を形成する
鋼板２とを交互にラップ代を設けて接合部３で斜め接合
している。Figure 1 shows an example of joining the steel plates of a transformer core with a tripod configuration, in which the steel plates forming the leg core and the steel plates 2 forming the upper and lower yokes are alternately connected at the joint 3 with a lap allowance provided. It is diagonally joined.

第２図および第３図は第１図の■−■線断面図で、前記
斜め接合部３での従来の接合方式の各側を拡大して示す
ものである。2 and 3 are cross-sectional views taken along the line ■--■ in FIG. 1, showing enlarged views of each side of the conventional joining method at the diagonal joining portion 3. FIG.

このうち第２図の接合方式では、Ａ−Ａ’部位を基準位
置として所定の等間隔のラップ代をもって各鋼板１，２
を交互に所要枚数積層して変圧器鉄心を構成している。Among these, in the joining method shown in Fig. 2, each steel plate 1, 2 is set at a predetermined evenly spaced lap distance using the A-A' portion as a reference position.
The transformer core is constructed by laminating the required number of layers alternately.

なお、各鋼板１．２の接合部にはギャップ４が存在する
。また、図示していないが、実際の変圧器鉄心において
は、幅の異なる鋼板群を順次積層して巻線が嵌装される
鉄心胛に外接するコアーサークル内に脚部鉄心を構成す
る。Note that a gap 4 exists at the joint of each steel plate 1.2. Furthermore, although not shown, in an actual transformer core, groups of steel plates of different widths are sequentially laminated to form a leg core within a core circle that circumscribes the core shank into which the windings are fitted.

この第２図の接合方式によれば、磁束の流れの乱れは接
合ギャップ４部分で発生゛するが、接合ギャップ４は基
準位置Ａ　−Ａ’部分で５０％を占め、また残りの５０
％の接合ギャップ４も僅少な間隔のラップ代部分に近接
して位置しているため、磁束の乱れが犬きく、発生損失
が大きい。According to the joining method shown in Fig. 2, disturbances in the flow of magnetic flux occur in the joining gap 4, but the joining gap 4 occupies 50% at the reference position A-A', and the remaining 50%.
% junction gap 4 is also located close to the lap margin portion with a small interval, so the disturbance of the magnetic flux is severe and the generated loss is large.

第３図の階段状接合方式は、これを改善するた−めに提
案されたものである。この方式では、脚部鉄心の鋼板１
と継鉄の銅板２・麩を、基準位置Ａ　−Ａ′とＢ　−Ｂ
’との間において、所定の等間隔で階段状にずらして順
次積層し、これを１積層単位りとし、この積層単位りを
必要数繰り返して積層鉄心を構成している。The stepped joining method shown in FIG. 3 was proposed to improve this problem. In this method, the steel plate 1 of the leg core
and the copper plate 2 of the yoke, at the reference positions A-A' and B-B.
' are sequentially stacked at predetermined equal intervals in a stair-like manner, forming one laminated unit, and repeating this laminated unit a necessary number of times to form a laminated iron core.

この第３図の接合方式によれば、基準位置Ａ　−Ａ′と
Ｂ　−Ｂ’との間における接合部数、すなわち接合ギャ
ップ数をｎとし、積層単位りの数をｍとしたとき、１つ
の基準位置、例えばＡ　−Ａ’部分での鉄心断面積に占
める接合ギャップ４の割合は、ｍ／ｎとなって第２図の
接合方式よりも大幅に減少し、接合ギャップ４部分での
磁束の流れの乱れは改善され、発生損失が像滅する。し
かし、この接合方式では、各接合部′ｆ！ｒ：鋼板の長
手方向において順次ずらせて配置しているため、隣接す
る銅板間の接合ラップ代を大きくとることができず、鉄
心接合部での機械的強度の面で問題があったＯ〔発明の
目的〕 本発明の目的は、前記した従来技術の欠点をなくシ、接
合ギャップ部分での鉄損が少なく、かつ鉄心接合部での
機械的強度を向上し得る変圧器鉄心を提供するにある。According to the joining method shown in Fig. 3, when the number of joints between the reference positions A-A' and B-B', that is, the number of joining gaps, is n, and the number of laminated units is m, one The ratio of the welding gap 4 to the core cross-sectional area at the reference position, for example, the A-A' portion, is m/n, which is much smaller than in the joining method shown in Fig. 2, and the magnetic flux at the welding gap 4 portion is m/n. Flow turbulence is improved and generated losses are eliminated. However, in this joining method, each joint 'f! r: Since the steel plates are arranged sequentially in the longitudinal direction, it is not possible to take a large bonding overlap between adjacent copper plates, and there is a problem in terms of mechanical strength at the core joint.O [Invention [Object of the present invention] An object of the present invention is to provide a transformer core that eliminates the drawbacks of the prior art described above, reduces iron loss at the joint gap portion, and improves mechanical strength at the core joint. .

〔発明の概璧〕[Synopsis of the invention]

この目的を達成するため、本発明は、脚部鉄心と継鉄の
端部における斜め接合部を、各層の（１１板間の接合ギ
ャップが銅板の長手方向において順次所定の等間隔で階
段状にずれた被数Ｆの階段状接合部を積層することによ
って構成し、かつ各群の階段状接合部に−おける各接合
ギャッ□プ位置を鋼板の長手方向において互に異ならせ
たことヲ橢徴とする。In order to achieve this object, the present invention provides diagonal joints at the ends of the leg core and the yoke so that the joint gaps between the (11) plates of each layer are sequentially stepped at predetermined equal intervals in the longitudinal direction of the copper plates. It is a shame that the joints are constructed by stacking stepped joints with shifted numbers F, and that the positions of the joint gaps in each group of stepped joints are different in the longitudinal direction of the steel sheets. shall be.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を第４図および第５図について
詳細に説明する。なお、図中、第１図乃至第３図と同一
符号は同一物または相当物を示す。Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5. In the drawings, the same reference numerals as in FIGS. 1 to 3 indicate the same or equivalent parts.

第４図は本発明が適用される三相三脚変圧器鉄心におい
て、三相各相の脚部鉄心の鋼板ＩＵ、ＩＶ、ｔＷを下部
継鉄の鋼板２で磁気的に結合し、上部継鉄は取外し、三
相各相の巻線５Ｕ、５Ｖ。FIG. 4 shows a three-phase three-legged transformer core to which the present invention is applied, in which the steel plates IU, IV, and tW of the leg core of each of the three phases are magnetically coupled by the steel plate 2 of the lower yoke, and the upper yoke Removed, 5U, 5V windings for each phase.

５Ｗを脚部鉄心にそれぞれ嵌装した状態を示す。5W is shown fitted into each leg core.

なお、巻線５Ｕ〜５Ｗを嵌装した後は、上部継鉄を構成
する鋼板を１枚ずつ順次挿鉄し、図示しない給付金具に
よシ上部および下部を締付けて変圧器を構成する。After the windings 5U to 5W are fitted, the steel plates constituting the upper yoke are sequentially inserted one by one, and the upper and lower parts are tightened using fittings (not shown) to construct the transformer.

第５図は第４図の■−■線断面図で、脚部鉄心の鋼板Ｉ
Ｕと継鉄の鋼板２との接合状態を拡大して示すが、他の
接合部もこれと同禄に構成されている。基準位置Ａ−Ａ
’とＢ　−Ｂ’との間において、−積層単位りを構成す
る第１の階段状接合部群Ｌ□と第２の階段状接合部群Ｌ
２とが交互に繰シ返して積層される。これらの各階段状
接合部群Ｌ□、Ｌ２”においては、各層の鋼板ＩＵと鋼
板２の間の接合ギャップ４が鋼板の長手方向においてｌ
、＋４２　（Ｊ□牛１２）の等間隔で順次階段状にずら
して配置されヤツプ４位置とは鋼板の長手方向に２いて
４３（−Ａ−１□／２キｌｐ／２）だけずらしである。Figure 5 is a sectional view taken along the line ■-■ in Figure 4, showing the steel plate I of the leg core.
Although the joint state between the U and the steel plate 2 of the yoke is shown in an enlarged manner, the other joints are constructed in the same way. Reference position A-A
' and B -B', a first step-like joint group L
2 are alternately and repeatedly stacked. In each of these stepped joint groups L□, L2'', the joint gap 4 between the steel plate IU and the steel plate 2 of each layer is l in the longitudinal direction of the steel plate.
, +42 (J□ cow 12) and are sequentially staggered at equal intervals, and the Yap 4 position is shifted by 2 and 43 (-A-1□/2 kilp/2) in the longitudinal direction of the steel plate. .

この実施例によれば、基準位置Ａ　−Ａ’あるいはＢ　
−Ｂ’部位において鉄心断面積に占める接合ギヤ多ブ４
の割合は、第３図の従来例と同様に、ｍ／ｎとなって大
幅に減少し、接合ギ１′ツブ４部分での磁束の流れの乱
れは改善され、発生損失を低減−することができるとと
もに、さらに＠接する鋼板間のラップ代は第３図の従来
例の約２倍になって、鉄心接合部での板様的強ｉｔ向上
することができるＯ なお、この実施例では、第１の１％７段状払合部群Ｌ□
の層数が５層で、接合キャップ４が５個であシ、第２の
階段状接合部群Ｌ２の層数が４層で、接合キヤツプ４が
４個であるが、これら各群の層数は任意に選定すること
ができる。According to this embodiment, the reference position A-A' or B
- Joining gear multiplicity 4 occupies the core cross-sectional area at B' location
As in the conventional example shown in Fig. 3, the ratio is significantly reduced to m/n, and the disturbance in the flow of magnetic flux at the joint gear 1' lug 4 is improved, reducing the generated loss. In addition, the lap distance between the contacting steel plates is approximately twice that of the conventional example shown in Fig. 3, and the plate-like strength at the core joint can be improved. 1st 1% 7-step payout group L□
The number of layers is 5, and the number of bonding caps 4 is 5. The number of layers of the second stepped joint group L2 is 4, and the number of bonding caps 4 is 4. The number can be selected arbitrarily.

また、階段状接合部群を２群とした場合について述べた
が、本発明はこれに限らず・、例えば３群あるいはそれ
以上の群にすることもでき、このように群の数を多くし
た場合には、それだけ隣接する鋼板間のラップ代を大き
くシ、鉄心接合部での機械的強度を増大することが可能
となる。ただ、例えば３群にする場合には、寸法Ａ３　
を１３＋ｌ□／３キｔ２／３とする必要がある。Further, although the case where the stepped joint group is made into two groups has been described, the present invention is not limited to this, but can also be made into three or more groups, for example, and it is possible to make the number of groups large in this way. In this case, it becomes possible to increase the lap distance between adjacent steel plates and increase the mechanical strength at the core joint. However, for example, when using 3 groups, the dimension A3
It is necessary to set it to 13+l□/3kitt2/3.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、脚部鉄心と継鉄
との斜め接合部での鉄損を低減し、かつこの斜め接合部
での機械的強度を増大することができる。As described above, according to the present invention, it is possible to reduce the iron loss at the diagonal joint between the leg core and the yoke, and to increase the mechanical strength at the diagonal joint.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の三脚構成の変圧器鉄心における鋼板接合
状態を示す正面図、第２図および第３図は従来の接合方
式の各側を示す第１図の■−■線拡犬断面図、第４図は
本発明が適用される三相三脚変圧器鉄心における鋼板接
合状態を示す正面図、第５図は本発明の一実施例を示す
第４図のｖ−Ｖ線拡大断面図である。 ＩＵ、ＩＶ、ＩＷ・・・・・・脚部鉄心の鋼板、２・・
・・・・継鉄の鋼板、３・・・・・・斜め接合部、４・
・・・・・接合ギャップ、Ｌ・・・・・・積層単位、Ｌ
ｌ、Ｌ２・・・・・・階段状接合部群。 第１因 第２図 第３図 Ａ４Ｅ’ 第４図 第５図Figure 1 is a front view showing the state of joining of steel plates in a conventional three-legged transformer core, and Figures 2 and 3 are enlarged cross-sectional views along the line ■-■ in Figure 1 showing each side of the conventional joining method. , FIG. 4 is a front view showing a steel plate bonded state in a three-phase tripod transformer core to which the present invention is applied, and FIG. 5 is an enlarged sectional view taken along the line v-V of FIG. 4 showing an embodiment of the present invention. be. IU, IV, IW...Steel plate of leg core, 2...
...Yoke steel plate, 3...Diagonal joint, 4.
...Joining gap, L...Lamination unit, L
l, L2...Step-like junction group. 1st factor 2nd figure 3rd figure A4E' 4th figure 5th figure

Claims (1)

【特許請求の範囲】[Claims] １、少なくとも２個の脚部鉄心と、これ・らの各脚部鉄
心間を磁気的に結合する上下継鉄とを備え、前記脚部鉄
心および継鉄を構成する積層鋼板を前記脚部鉄心と前記
継鉄の端部において斜め接合してなる変圧器鉄心におい
て、前記斜め接合部を、各層の鋼板間の接合ギャップが
鋼板の長手方向に順次所定の等間隔で階段状にずれた複
数群の階段状接合部を積層することによって構成し、か
つ各群の階段状接合部における各接合ギャップ位置を鋼
板の長手方向において互に異ならせたことを特徴とする
変圧器鉄心。1. At least two leg cores, and upper and lower yokes that magnetically connect the leg cores, and the laminated steel plates constituting the leg cores and yokes are connected to the leg cores. In a transformer core formed by joining diagonally at the end of the yoke, the diagonal joint is formed into a plurality of groups in which the joining gap between the steel plates of each layer is sequentially shifted in the longitudinal direction of the steel plates at predetermined equal intervals in a step-like manner. What is claimed is: 1. A transformer core characterized in that the step-like joints of each group are stacked, and the positions of the joint gaps in the step-like joints of each group are different from each other in the longitudinal direction of the steel plates.