JPS63204707A - Manufacture of mold type transformer - Google Patents
Manufacture of mold type transformerInfo
- Publication number
- JPS63204707A JPS63204707A JP3706187A JP3706187A JPS63204707A JP S63204707 A JPS63204707 A JP S63204707A JP 3706187 A JP3706187 A JP 3706187A JP 3706187 A JP3706187 A JP 3706187A JP S63204707 A JPS63204707 A JP S63204707A
- Authority
- JP
- Japan
- Prior art keywords
- wound core
- wound
- magnetic alloy
- amorphous magnetic
- corrosion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229910001004 magnetic alloy Inorganic materials 0.000 claims abstract description 29
- 239000003973 paint Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000004804 winding Methods 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000010409 thin film Substances 0.000 abstract 2
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 238000005452 bending Methods 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 19
- 238000010586 diagram Methods 0.000 description 10
- 230000002265 prevention Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 229920000180 alkyd Polymers 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
不発明は非晶質磁性合金薄帯から成る巻鉄心を備えたモ
ールド形変圧器の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a molded transformer having a wound core made of an amorphous magnetic alloy ribbon.
（従来技術）
近年モールド形変圧器においては低損失化が要求されて
おシ、この要求に沿って変圧器に設ける巻鉄心の材料と
して、鉄損及び励磁電流特性の優れた非晶質磁性合金薄
帯を用いることが試みられている。非晶質磁性合金薄帯
の中で、変圧器用鉄心には鉄系の非晶質磁性合金薄帯が
使用されているが、この鉄系の非晶質磁性合金薄帯は錆
やすいといり性質をもっておシ、しかも発生した錆は非
晶質磁性合金薄帯の磁気特性と耐久性を低下させる欠点
がある。このため非晶質磁性合金薄帯からなる巻鉄心を
備えたモールド形変圧１ｔ−ａ造するに際しては１巻鉄
心に防錆処理ｔ−施して非晶質磁性合金薄帯における錆
の発生を防止することが必要である。モールド形変圧器
を製造する方法として、コイル素体に樹脂を含浸し硬化
してなるモールドコイルと巻鉄心とを組合せる方法があ
るが、この方法はそ−ルドコイルを装着した巻鉄心脚部
がコイルに隠されて防錆処理を施すことができなｈ問題
がある。(Prior art) In recent years, there has been a demand for lower loss in molded transformers, and in line with this demand, amorphous magnetic alloys with excellent iron loss and excitation current characteristics have been used as materials for wound cores installed in transformers. Attempts have been made to use thin strips. Among the amorphous magnetic alloy ribbons, iron-based amorphous magnetic alloy ribbons are used in transformer cores, but these iron-based amorphous magnetic alloy ribbons tend to rust easily. Moreover, the rust that occurs has the disadvantage of deteriorating the magnetic properties and durability of the amorphous magnetic alloy ribbon. For this reason, when building a molded transformer 1t-a with a wound core made of amorphous magnetic alloy ribbon, the first-turn iron core is subjected to anti-rust treatment to prevent rust from forming on the amorphous magnetic alloy ribbon. It is necessary to. One method of manufacturing a molded transformer is to combine a wound core with a molded coil made by impregnating and hardening a coil body with resin. There is a problem in that it is hidden in the coil and cannot be treated with anti-rust treatment.
この問題に対処するためには、特公昭５２−２５１２７
号に開示されているよりに合成樹脂を含浸して形成し丸
巻鉄心を２分割し、次に各分割面を接合した状態で巻鉄
心の外表面に防錆性塗料ｔ−ｍｂ、その後に巻鉄心を分
割してその分割面に接着剤を塗布し、これを接合面とし
て巻鉄心をモールドコイルに組付けるいわゆるＣカット
；ア方式により製造する方法がある。In order to deal with this problem,
A round-wound core is formed by impregnating it with a synthetic resin as disclosed in the above issue, and is divided into two parts. Next, with each divided surface joined, the outer surface of the wound core is coated with anti-rust paint T-MB. There is a manufacturing method using the so-called C-cut method, in which the wound core is divided, an adhesive is applied to the divided surfaces, and the wound core is assembled into a molded coil using this as a joining surface.
（発明が解決しようとする問題点）
しかし、このＣカットコア方式の製造方法を応力感受性
の大きい非晶質磁性合金薄帯からなる巻鉄心を備えたモ
ールド形変圧器に採用すると、次の様な問題が生じる。(Problems to be Solved by the Invention) However, when this C-cut core manufacturing method is applied to a molded transformer equipped with a wound core made of amorphous magnetic alloy ribbon with high stress sensitivity, the following problems occur. A problem arises.
巻鉄心を２分割するために巻鉄心に合成樹脂を含浸する
と１巻鉄心の非晶質磁性合金薄膏層閲に合成樹脂が侵入
する。そして、侵入した合成樹脂が硬化収縮する時に非
晶質磁性合金薄帯に力が作用するので、非晶質磁性合金
薄帯の磁気特性すなわち巻鉄心の磁気特性が低下すると
いう問題がある。When the wound core is impregnated with a synthetic resin in order to divide the wound core into two, the synthetic resin invades the amorphous magnetic alloy thin plaster layer of the first wound core. Then, when the intruded synthetic resin hardens and shrinks, force acts on the amorphous magnetic alloy ribbon, so there is a problem that the magnetic properties of the amorphous magnetic alloy ribbon, that is, the magnetic properties of the wound core, deteriorate.
本発明は前記事情に基づいてなされ九もので。The present invention has been made based on the above circumstances.
非晶質磁性合金薄帯からなる巻鉄心に磁気特性を低下さ
せることなく防錆処理を施すことができるそ一ルド形変
圧器の製造方法を提供することにある。It is an object of the present invention to provide a method for manufacturing a twisted type transformer in which rust prevention treatment can be applied to a wound core made of an amorphous magnetic alloy ribbon without deteriorating its magnetic properties.
［発明の構成コ
（問題点を解決するための手段）
前記目的を達成する丸めに本発明のモールド形変圧器の
製造方法は、非晶質磁性合金薄帯ｆｔ＊回してなる巻回
体を切断展開して多数の非晶質磁性合金薄帯を積層して
なる積層体を形成し１次いでこの積層体を角形に折曲し
て巻鉄心を形成し、前記非晶質磁性合金薄帯の両端面を
突合せ接合し九端面接合部が位置する前記巻鉄心０−１
−り部を除く他の部分の表面に防錆性塗料を塗布し、さ
らに前記巻鉄心の前記端面接合部が位置するヨーク部を
開いてモールドコイルを前記巻鉄心の脚部に嵌合し、そ
の後前記巻鉄心のヨーク部を閉じ、このヨーク部に防錆
性塗料ｔ−塗布すること金特徴とするものである。[Structure of the Invention (Means for Solving the Problems) The method for manufacturing a molded transformer of the present invention achieves the above-mentioned object by rolling a wound body formed by winding an amorphous magnetic alloy ribbon ft*. A laminate is formed by laminating a large number of amorphous magnetic alloy ribbons by cutting and expanding, and then this laminate is bent into a square shape to form a wound core. The above-mentioned wound core 0-1 in which both end faces are butt-joined and the nine-end face joint portion is located.
- Applying an anti-rust paint to the surface of the other parts except for the bent part, further opening the yoke part where the end surface joint part of the wound core is located, and fitting the molded coil to the leg part of the wound core, Thereafter, the yoke portion of the wound core is closed, and the yoke portion is coated with antirust paint.
（作用）
モールドコイルを嵌合する巻鉄心の脚部に防錆処理を施
し、その後にモールドコイルを巻鉄心に嵌合するので、
モールドコイルの装着く拘束されずに巻鉄心の表面全体
に防錆処理を施すことができ、且つ防錆処理として防錆
塗料を塗布するので、防錆処理が巻鉄心の磁気特性に影
響を与えることがない。(Function) The legs of the core where the molded coil is fitted are treated with anti-rust treatment, and then the molded coil is fitted onto the core.
Rust prevention treatment can be applied to the entire surface of the wound core without being restricted by the installation of the molded coil, and since antirust paint is applied as rust prevention treatment, the rust prevention treatment does not affect the magnetic properties of the wound core. Never.
（実施例） 以下本発明の一実施例を図面を参照して説明する。(Example) An embodiment of the present invention will be described below with reference to the drawings.
まず、第２図で示すよりに非晶質磁性合金薄帯１１にト
ロイダル状に巻回して巻回体２ｔ−形成する。First, as shown in FIG. 2, the amorphous magnetic alloy ribbon 11 is wound in a toroidal shape to form a wound body 2t.
久いで、巻回体２の所定の一箇所を軸方向に砥石又はレ
ーデ−等の手段によ多切断し、この切断部の一端を巻回
体２の側面に対して直角を維持したまま、非晶質磁性合
金薄帯１ｔ−その弾性復元力を利用して平面上に展開す
る。これによ１１図に示すように多数枚の非晶質磁性合
金薄帯１が積層され且つ一万の端面が直角な不等脚台形
をなす積層体３を形成する。After a while, a predetermined point of the wound body 2 is cut in the axial direction by means such as a grindstone or a radar, and one end of the cut portion is kept perpendicular to the side surface of the wound body 2. Amorphous magnetic alloy ribbon 1t - unfolds on a plane using its elastic restoring force. As a result, as shown in FIG. 11, a large number of amorphous magnetic alloy ribbons 1 are laminated to form a laminate 3 in the form of an isosceles trapezoid with 10,000 end faces at right angles.
次に第４図で示すように積層体３を所定の複数枚（例え
ば２００枚程度）を１ブロツクとした積厚ｔの複数の積
層ブロック３ム、３Ｂ、３Ｃ。Next, as shown in FIG. 4, a plurality of laminated blocks 3, 3B, and 3C each having a laminated thickness t, each block having a predetermined plurality of laminated bodies 3 (for example, about 200 laminated bodies).
３Ｄ、３Ｂに分割し、分割した各積層ブロック３人、・
・・３Ｅをその一端の直角を維持したまま７πｔの長さ
づつ薄帯長手方向に順次階段状にずらせて順次積みなお
す。Divided into 3D and 3B, each divided laminated block has 3 people,・
...While maintaining the right angle of one end, 3E is sequentially shifted stepwise in the longitudinal direction of the ribbon by a length of 7πt, and then stacked again.
次に第５図で示すように一端が開放可能な上部蓋５を有
する矩形の巻枠４を用意し、この巻枠４を積層体３の最
上層つまシ巻鉄心の最内周層に位置する積層ｆｏクック
Ｅの上面に配置する。そして、巻枠４の外周形状に沿っ
て積層体３の各積層ブロック３Ａ〜３Ｅｆ：折曲して巻
回し、第６図で示すように各積層ブロック３Ａ〜３Ｅの
両端面を突合せて接合することによシ巻鉄心６を形成す
る。Next, as shown in FIG. 5, a rectangular winding frame 4 having an upper lid 5 that can be opened at one end is prepared, and this winding frame 4 is positioned on the innermost layer of the top layer of the laminate-wound core of the laminate 3. placed on the upper surface of the laminated fo cook E. Then, each of the laminated blocks 3A to 3Ef of the laminated body 3 is bent and wound along the outer peripheral shape of the winding frame 4, and both end surfaces of each of the laminated blocks 3A to 3E are butted and joined as shown in FIG. In particular, a wound core 6 is formed.
この巻鉄心６は各積層ブロック３Ａ〜３Ｅの両端接合部
が斜めに重なりて接合している斜めバットラップノ、イ
ンド形であシ、この両端接合部は巻枠４の上部蓋５に対
応して位置している。This winding core 6 has a diagonal butt lap or Indian shape in which both end joints of each of the laminated blocks 3A to 3E are diagonally overlapped and joined, and these both end joints correspond to the upper lid 5 of the winding frame 4. It is well located.
このようにして構成した巻鉄心６に温度３６０〜４００
℃、１〜２時間の条件で焼鈍を行なう。この焼鈍によシ
非晶質磁性合金薄帯１の磁気特性が回復して巻鉄心６の
磁気特性が向上する。The wound core 6 configured in this way has a temperature of 360 to 400.
Annealing is carried out at a temperature of 1 to 2 hours. This annealing restores the magnetic properties of the amorphous magnetic alloy ribbon 1 and improves the magnetic properties of the wound core 6.
次いで、第７図で示すように巻鉄心６の端面接合部を有
する上ヨーク部を除いて他の部分すなわち巻鉄心６の下
ヨーク部および両側の脚部の表面全体に防錆処理を行な
う。この防錆処理は、常温硬化量のエポキシ変形アルキ
ッド塗料などの防錆性塗料７ｔ−図示するようなスプレ
ーノズル９を用いた吹付けや刷毛車シなどの方法によシ
塗布して行なうものであシ、鉄心表面に塗布した塗料７
が巻鉄心６の非晶質磁性合金薄帯１の層間に侵入するこ
とがない。Next, as shown in FIG. 7, an anticorrosion treatment is applied to the entire surface of the lower yoke and both legs of the wound core 6 except for the upper yoke having the end surface joints. This anti-corrosion treatment is carried out by applying a rust-preventive paint such as epoxy deformed alkyd paint that hardens at room temperature by spraying using a spray nozzle 9 as shown in the figure or using a brush wheel. Paint 7 applied to the reeds and iron core surface
The amorphous magnetic alloy ribbon 1 of the wound core 6 does not penetrate between the layers.
久いで、第８図で示すように巻鉄心６の上ヨーク部を端
面接合部から開放して垂直に起立し、別工程でコイル素
体に樹脂を含浸し硬化して製作してなるモールドコイル
８，８を巻鉄心６の両側の脚部に夫々嵌め込み、その後
再び巻鉄心６の上ヨーク部を水平に折シ曲げて端面接合
部を閉じる。As shown in Fig. 8, the upper yoke part of the wound core 6 is opened from the end surface joint part and stands vertically, and the coil body is impregnated with resin and hardened in a separate process to produce a molded coil. 8, 8 are fitted into the legs on both sides of the wound core 6, respectively, and then the upper yoke portion of the wound core 6 is bent horizontally again to close the end surface joint.
しかる後、第１図で示すようにまだ防錆処理を施してい
ない巻鉄心６の上ヨーク部に防錆処理を施す。この防錆
処理は巻鉄心６の他の部分の防錆処理と同様にエポキシ
変形アルキッド塗料などの防錆性塗料７を図示するよう
なスプレーノズル９を用いた吹付けや刷毛車シによシ塗
布して行ない、この上ヨーク部においても、非晶質磁性
合金薄帯１の層間に防錆性塗料７が浸入しないようにす
る。Thereafter, as shown in FIG. 1, the upper yoke portion of the wound core 6, which has not yet been subjected to rust prevention treatment, is subjected to rust prevention treatment. Similar to the rust prevention treatment of other parts of the wound core 6, this rust prevention treatment is carried out by spraying the rust prevention paint 7 such as epoxy deformed alkyd paint with a spray nozzle 9 as shown in the figure or by using a brush wheel. The rust-preventing paint 7 is also prevented from penetrating between the layers of the amorphous magnetic alloy ribbon 1 in the upper yoke portion.
これにより、巻鉄心６は防錆性塗料７によシ表面全体が
完全に覆われ、しかも防錆性塗料７が巻鉄心６の表面に
のみ付着した状態となるので、防錆性塗料７の硬化収縮
による応力をほとんど受けず、磁気特性を低下させるこ
とがない。As a result, the entire surface of the wound core 6 is completely covered with the rust-preventing paint 7, and the rust-preventing paint 7 is only attached to the surface of the wound core 6. It is hardly subjected to stress due to curing shrinkage, and its magnetic properties do not deteriorate.
［発明の効果コ
以上説明したように本発明によるモールド形変圧器の製
造方法によれば、モールドコイルを装着する前と後に分
けて巻鉄心の表面に防錆性塗料ｔ−塗布するので、巻鉄
心の表面全体に確実に防錆処理を施すことができ、しか
も巻鉄心の磁気特性を低下させるおそれもない。[Effects of the Invention] As explained above, according to the method for manufacturing a molded transformer according to the present invention, since the rust-preventive paint T is applied to the surface of the wound core separately before and after installing the molded coil, the winding Anti-rust treatment can be reliably applied to the entire surface of the core, and there is no risk of degrading the magnetic properties of the wound core.
図面は本発明の製造方法の一実施例を示し、第１図はモ
ールド形変圧器を示す説明図、第２図は非晶質磁性合金
薄帯の巻回体を示す説明図、第３図は第１図の巻回体を
切断して展開した状態を示す説明図、第４図は複数の積
層ブロックからなる積層体を示す構成図、第５図は巻枠
に積層体をそわせて成形する場合を示す説明図、第６図
は巻鉄心を示す説明図、第７図は巻鉄心の脚部および下
部ヨーク部に防錆処理を施す工程を示す説明図、第８図
はモールドコイルを巻鉄心に装着する方法を示す説明図
である。
１・・・非晶質磁性合金薄帯、３・・・積層体、６・・
・巻鉄心、７・・・防錆性塗料、８・・・モールドコイ
ル。
出願人代理人 弁理士 鈴江武 彦
第１図The drawings show an embodiment of the manufacturing method of the present invention, and FIG. 1 is an explanatory diagram showing a molded transformer, FIG. 2 is an explanatory diagram showing a wound body of an amorphous magnetic alloy ribbon, and FIG. is an explanatory diagram showing the state in which the rolled body of Figure 1 is cut and unfolded, Figure 4 is a configuration diagram showing a laminate consisting of a plurality of laminated blocks, and Figure 5 is an explanatory diagram showing the state in which the rolled body of Figure 1 is cut and expanded. An explanatory diagram showing the case of molding, Fig. 6 is an explanatory diagram showing the wound core, Fig. 7 is an explanatory diagram showing the process of applying rust prevention treatment to the legs and lower yoke of the wound core, and Fig. 8 is an explanatory diagram showing the molded coil. FIG. 3 is an explanatory diagram showing a method of attaching the winding core to the wound core. 1... Amorphous magnetic alloy ribbon, 3... Laminate, 6...
・Wound core, 7... Rust-proof paint, 8... Molded coil. Applicant's representative Patent attorney Takehiko Suzue Figure 1
Claims (1)
して多数の非晶質磁性合金薄帯を積層してなる積層体を
形成し、この積層体を角形に折曲して巻鉄心を形成した
後、前記非晶質磁性合金薄帯の両端面を突合せ接合した
端面接合部が位置する前記巻鉄心のヨーク部を除く他の
部分の表面に防錆性塗料を塗布し、次に前記巻鉄心の前
記端面接合部が位置するヨーク部を開いてモールドコイ
ルを前記巻鉄心の脚部に嵌合し、その後前記巻鉄心のヨ
ーク部を閉じてこのヨークに防錆性塗料を塗布すること
を特徴とするモールド形変圧器の製造方法。A laminate made of a large number of amorphous magnetic alloy thin strips is formed by cutting and expanding a wound body made by winding an amorphous magnetic alloy thin strip, and this laminate is bent into a square shape. After forming the wound core, applying an anti-corrosion paint to the surface of the other portions of the wound core except for the yoke portion where the end surface joint where both end surfaces of the amorphous magnetic alloy ribbon are butt-joined is located; Next, the yoke portion of the wound core where the end surface joint portion is located is opened and the molded coil is fitted to the leg portion of the wound core, and then the yoke portion of the wound core is closed and a rust-preventive paint is applied to this yoke. A method for manufacturing a molded transformer, characterized by coating the molded transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3706187A JPH073807B2 (en) | 1987-02-20 | 1987-02-20 | Manufacturing method of mold type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3706187A JPH073807B2 (en) | 1987-02-20 | 1987-02-20 | Manufacturing method of mold type transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63204707A true JPS63204707A (en) | 1988-08-24 |
| JPH073807B2 JPH073807B2 (en) | 1995-01-18 |
Family
ID=12487043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3706187A Expired - Fee Related JPH073807B2 (en) | 1987-02-20 | 1987-02-20 | Manufacturing method of mold type transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073807B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6855284B2 (en) * | 2002-04-30 | 2005-02-15 | Abb Technology Ag | Process for bending a workpiece |
| JP2006173449A (en) * | 2004-12-17 | 2006-06-29 | Hitachi Industrial Equipment Systems Co Ltd | Transformer |
| JP2010263233A (en) * | 2010-07-12 | 2010-11-18 | Hitachi Industrial Equipment Systems Co Ltd | Transformer |
| JP2011134794A (en) * | 2009-12-22 | 2011-07-07 | Takaoka Kasei Kogyo Kk | Winding core and method of assembling the same |
| JP2016201489A (en) * | 2015-04-13 | 2016-12-01 | 株式会社ダイヘン | Junction separation method for wound core, and outermost peripheral steel-plate cutting device for wound core |
| CN109727752A (en) * | 2019-01-26 | 2019-05-07 | 蓉中电气股份有限公司 | A kind of natural esters insulating oil distribution transformer |
| CN109786085A (en) * | 2019-01-26 | 2019-05-21 | 蓉中电气股份有限公司 | A kind of natural esters transformer that insulation effect is good |
-
1987
- 1987-02-20 JP JP3706187A patent/JPH073807B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6855284B2 (en) * | 2002-04-30 | 2005-02-15 | Abb Technology Ag | Process for bending a workpiece |
| JP2006173449A (en) * | 2004-12-17 | 2006-06-29 | Hitachi Industrial Equipment Systems Co Ltd | Transformer |
| JP2011134794A (en) * | 2009-12-22 | 2011-07-07 | Takaoka Kasei Kogyo Kk | Winding core and method of assembling the same |
| JP2010263233A (en) * | 2010-07-12 | 2010-11-18 | Hitachi Industrial Equipment Systems Co Ltd | Transformer |
| JP2016201489A (en) * | 2015-04-13 | 2016-12-01 | 株式会社ダイヘン | Junction separation method for wound core, and outermost peripheral steel-plate cutting device for wound core |
| CN109727752A (en) * | 2019-01-26 | 2019-05-07 | 蓉中电气股份有限公司 | A kind of natural esters insulating oil distribution transformer |
| CN109786085A (en) * | 2019-01-26 | 2019-05-21 | 蓉中电气股份有限公司 | A kind of natural esters transformer that insulation effect is good |
| CN109727752B (en) * | 2019-01-26 | 2020-07-14 | 蓉中电气股份有限公司 | Natural ester insulating oil distribution transformer |
| CN109786085B (en) * | 2019-01-26 | 2020-07-14 | 蓉中电气股份有限公司 | Natural ester transformer with good insulation effect |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH073807B2 (en) | 1995-01-18 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |