JPH028443B2 - - Google Patents

Description

【発明の詳細な説明】 本発明は非晶質磁性薄帯を巻回して構成した変
圧器の鉄心構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer core structure constructed by winding an amorphous magnetic ribbon.

周知のように、変圧器における鉄心材料の低損
失技術の進歩は著しいものがあり、このなかでも
アモルフアスと称する非晶質の磁性材料が、今日
新しい低損失材料として注目を集めている。この
非晶質の磁性材料はその製造過程が珪素鋼帯とな
なり、金属を液状の状態から高速冷却させてつく
られ、前記高速冷却時に原子配列の乱れた非晶質
状態を得るようにした点が大きな特徴で、磁気特
性は従来の珪素鋼帯に比べ非常に優れている。し
かし、前記非晶質の磁性材料（以下非晶質磁性薄
帯という）はその製法上板厚を余り厚くすること
ができず、珪素鋼帯の1/10以下で20乃至30μｍ程
度と非常に薄く、その上、弾力性に富んでいるた
め、非晶質磁性薄帯を用いて変圧器の鉄心を製作
するには種々の困難が伴う。例えば、前記非晶質
磁性薄帯を円形に巻回してからこれを第２図に示
すように、矩形成形用の芯金１と成形板２を用い
て矩形状に成形加工し、このあと矩形成形された
鉄心３を磁場焼鈍してから鉄心３の脚鉄部ａに図
示しない補強板を取付けたり、絶縁性のテープを
巻回する等して、前記脚鉄部ａを直線状に保持さ
せて鉄心３にコイル４を巻装したり、あるいは、
第１図に示すように、非晶質磁性薄帯５を巻芯６
に芯金１を介して巻回して矩形状の鉄心３を形成
し、この鉄心３を前記同様、第２図に示す如く、
矩形芯金１および成形板２を用いて矩形状態に保
持させて磁場焼鈍を行い、次に鉄心の脚鉄部ａを
補強材により補強してコイル４を巻装していた。
然るに、非晶質磁性薄帯を円形又は矩形状に巻回
してから、これら巻回された鉄心を矩形状の芯金
１と成形板２とを用いて鉄心３を矩形状に成形保
持させる場合、前記鉄心３はそれぞれ成形板２に
よつて、鉄心３の中心方向、即ち、鉄心３の脚鉄
部ａおよび継鉄部ｂを圧縮する方向に押圧するた
め、鉄心３にはその成形時大きな圧縮力が加わ
る。ところで、非晶質磁性薄帯は、その薄帯に前
記のような圧縮力がかかると損失は増加し、逆
に、適当な大きさの引張力をかければ損失が減少
するということが明らかになつてきた。このこと
は第４図の特性図に示す如く、非晶質磁性薄帯に
おいては特に顕著である。又、非晶質磁性薄帯巻
回した鉄心３にコイル４を巻装する場合、鉄心３
の脚鉄部ａは図示しない補強板等によつて直線状
に保持されているが、継鉄部ｂには何等の対策も
施されていない。このため、非晶質磁性薄帯は前
記の如く、板厚が非常に薄く、しかも、剛性に乏
しいので、巻線時、前記継鉄部ｂの内側部分が鉄
心３の窓内に垂れてコイル４との間隙Ｓが小さく
なつて巻線作業に支障をきたすことが多いため、
鉄心３はその窓内寸法を大きくして製作する必要
があつた。 As is well known, there has been remarkable progress in low-loss technology for iron core materials in transformers, and among these, an amorphous magnetic material called amorphous is currently attracting attention as a new low-loss material. This amorphous magnetic material is made into a silicon steel strip through the manufacturing process, and is made by rapidly cooling the metal from a liquid state, and during the rapid cooling, an amorphous state with disordered atomic arrangement is obtained. This is a major feature, and its magnetic properties are much better than conventional silicon steel strips. However, due to the manufacturing method, the amorphous magnetic material (hereinafter referred to as amorphous magnetic ribbon) cannot be made very thick, and is approximately 20 to 30 μm thick, which is less than 1/10 of that of silicon steel strip. Because it is thin and has high elasticity, there are various difficulties in manufacturing transformer cores using amorphous magnetic ribbon. For example, the amorphous magnetic ribbon is wound into a circular shape, and as shown in FIG. After the formed iron core 3 is annealed in a magnetic field, the leg iron part a of the iron core 3 is held in a straight line by attaching a reinforcing plate (not shown) to the leg iron part a, or by wrapping an insulating tape around the leg iron part a. winding the coil 4 around the iron core 3, or
As shown in FIG.
A rectangular iron core 3 is formed by winding the metal core 1 through the metal core 1, and as shown in FIG.
A rectangular core metal 1 and a molded plate 2 were used to maintain the rectangular shape and magnetic field annealing was performed, and then the leg iron portion a of the iron core was reinforced with a reinforcing material and a coil 4 was wound thereon.
However, when an amorphous magnetic ribbon is wound into a circular or rectangular shape, the iron core 3 is formed and held in a rectangular shape using a rectangular core metal 1 and a forming plate 2. , the iron core 3 is pressed by the forming plate 2 in the direction of the center of the iron core 3, that is, in the direction of compressing the leg iron part a and the yoke part b of the iron core 3. Compressive force is applied. By the way, it is clear that the loss of an amorphous magnetic ribbon increases when the above-mentioned compressive force is applied to the ribbon, and conversely, the loss decreases when an appropriate amount of tensile force is applied to the ribbon. I'm getting old. This is particularly noticeable in amorphous magnetic ribbons, as shown in the characteristic diagram of FIG. In addition, when winding the coil 4 around the iron core 3 wound with an amorphous magnetic ribbon, the iron core 3
Although the leg iron part a is held in a straight line by a reinforcing plate (not shown) or the like, no measures have been taken on the yoke part b. Therefore, as mentioned above, the amorphous magnetic ribbon is very thin and has poor rigidity, so during winding, the inner part of the yoke part b hangs down inside the window of the iron core 3, causing the coil to become coiled. Since the gap S with 4 becomes small, which often hinders the winding work,
It was necessary to manufacture the iron core 3 by enlarging the inside dimensions of the window.

本発明は前記の問題点を解消し、非晶質磁性薄
帯を巻回してつくられる鉄心に張力を付与して、
鉄心の特性を向上させると共に、鉄心およびコイ
ルの生産性を向上させるようにした変圧器の鉄心
構造を提供するもので、以下本発明を第５図乃至
第８図においてノーカツトの巻鉄心に実施した例
により説明する。 The present invention solves the above problems by applying tension to an iron core made by winding an amorphous magnetic ribbon.
The purpose of the present invention is to provide a transformer core structure that improves the characteristics of the core and improves the productivity of the core and coils. Let's explain by example.

最初に、非晶質磁性薄帯５を円形に所要回数巻
回して円形鉄心を形成し、この円形鉄心の外側を
上下方向から成形板２を介してプレス等により前
記円形鉄心を矩形状に押圧しながらこの円形鉄心
の内側に２つ割となつた芯金１を挿入して、前記
円形鉄心を第５図に示すように、継鉄部ｂが弧状
となるよう脚鉄部ｂのみを押圧してほぼ矩形状の
巻鉄心１１をつくる。この際、巻鉄心１１は固定
ボルト１２により成形板２，２を連結固定するこ
とにより、ほぼ矩形状に保持されている。次に、
巻鉄心１１の脚鉄部ａに、芯金１と成形板２とを
備えた状態で励磁コイル１３を所要回数巻回す
る。つづいて、窒素又はアルゴン等の零囲気ガス
を充満させた焼鈍炉に励磁コイル１３を巻回した
巻鉄心１１を入れて、前記励磁コイル１３に通電
を行いながら巻鉄心１１を所定の温度範囲で磁場
焼鈍を行う。焼鈍後、巻鉄心１１を冷却させて焼
鈍炉から取り出し、励磁コイル１３、成形板２、
芯金１を巻鉄心１１の脚鉄部ａに図示しない補強
板を取付けたり、あるいはテープを巻回する等し
て、脚鉄部ａが形崩れしないよう直線状に固定保
持する。このため、巻鉄心１１はその脚鉄部ａが
直線状に、継鉄部ｂはその内側面が垂れ下がるこ
となく外側に向けて弧状に形成されることとな
る。次に、前記巻鉄心１１にコイル４を巻装する
場合は、例えば、第７図に示すように、２分割し
た巻枠１４を巻鉄心１１の一方の脚部ａに被せ、
この巻枠１４の両端には複数個に分割可能な駆動
歯車１５が所要の空間を保つて嵌合され、この駆
動歯車１５と巻枠１４外周面との間の空間に、前
記駆動歯車１５の両側から金具１６を嵌め込み、
これら金具１６をねじ１７により締付けると、金
具１６は、その上辺に設けた傾斜が駆動歯車１５
の内側に設けた斜面に沿つて互に相対する方向に
移動し、巻枠１４を中心に向つて押えつけるよう
な状態で、駆動歯車１５と巻枠１４とを強く固定
する。この状態で、駆動歯車１５を電動機と駆動
結合された図示しない歯車と噛合させ、前記駆動
歯車１５を駆動させることにより巻枠１４を回転
させて、この巻枠１４にコイル４を巻装する。コ
イル４の巻回後、金具１６、駆動歯車１５は、こ
れらを止着しているねじを外すことにより容易に
巻鉄心１１から取外すことができる。尚、コイル
４の巻回に当つては、巻鉄心１１の継鉄部ｂがそ
れぞれ外側に向けて湾曲させてあるので、継鉄部
ｂの内側が垂れて巻線作業に支障をきたすことは
ない。前記のようにして巻鉄心１１のもう一方の
脚鉄部ａにもコイル４を設けたあと、巻鉄心１１
の継鉄部ｂ内側面と、コイル４の軸向向両端面と
の間に、第８図Ａに示す半月形のスペーサ１８
を、その弧状部を継鉄ｂの内側面に合致させた状
態で遊合し、つづいて、前記スペーサ１８の平坦
面とコイル４端面との隙間に、第８図Ｂに示す一
対の板状となつたクサビ１９を圧入する。前記ク
サビ１９の圧入により巻鉄心１１の弧状となつた
継鉄部ｂには、第６図に示す矢印方向にスペーサ
１８を介して張力がかかることとなる。尚、前記
クサビ１９の圧入は張力を付与する手段であるほ
かに、コイル４を固定するという効果もある。
又、前記スペーサ１８およびクサビ１９は、耐油
性および機械的強度に優れた合成樹脂等の絶縁材
料によつて半月状並びに楔状に加工されている。 First, the amorphous magnetic ribbon 5 is wound in a circle a required number of times to form a circular core, and the outside of the circular core is pressed into a rectangular shape by a press or the like via a forming plate 2 from above and below. While doing so, insert the core metal 1 which has been split into two into the inside of this circular iron core, and press only the leg iron part b so that the yoke part b has an arc shape, as shown in FIG. Thus, a substantially rectangular wound core 11 is produced. At this time, the wound core 11 is held in a substantially rectangular shape by connecting and fixing the molded plates 2, 2 with fixing bolts 12. next,
The excitation coil 13 is wound a required number of times around the leg iron part a of the wound iron core 11, with the core metal 1 and the molded plate 2 provided therein. Next, the wound core 11 with the excitation coil 13 wound thereon is placed in an annealing furnace filled with a zero atmosphere gas such as nitrogen or argon, and the wound core 11 is heated within a predetermined temperature range while energizing the excitation coil 13. Perform magnetic field annealing. After annealing, the wound core 11 is cooled and taken out from the annealing furnace, and the excitation coil 13, the formed plate 2,
The core metal 1 is fixed and held in a straight line so that the leg iron part a does not lose its shape by attaching a reinforcing plate (not shown) to the leg iron part a of the wound iron core 11 or by winding tape. Therefore, the leg iron part a of the wound core 11 is formed in a straight line, and the inner surface of the yoke part b is formed in an arc shape toward the outside without sagging. Next, when winding the coil 4 around the wound core 11, for example, as shown in FIG. 7, the winding frame 14 divided into two is placed over one leg a of the wound core 11,
A drive gear 15 that can be divided into a plurality of pieces is fitted to both ends of the winding frame 14 while maintaining a required space. Insert the metal fittings 16 from both sides,
When these metal fittings 16 are tightened with screws 17, the slope provided on the upper side of the metal fittings 16 will be aligned with the driving gear 15.
The driving gear 15 and the winding frame 14 are strongly fixed by moving in opposite directions along the slope provided on the inside of the drive gear 15 and pressing the winding frame 14 toward the center. In this state, the drive gear 15 is meshed with a gear (not shown) that is drive-coupled to the electric motor, and the drive gear 15 is driven to rotate the winding frame 14, and the coil 4 is wound around the winding frame 14. After winding the coil 4, the metal fittings 16 and the drive gear 15 can be easily removed from the wound core 11 by removing the screws fixing them. When winding the coil 4, the yoke parts b of the winding core 11 are each curved outward, so that the inside of the yoke parts b will not sag and interfere with the winding work. do not have. After providing the coil 4 on the other leg iron part a of the winding core 11 as described above, the winding core 11
A half-moon-shaped spacer 18 shown in FIG.
are fitted loosely with their arcuate portions aligned with the inner surface of the yoke b, and then a pair of plate-shaped plates shown in FIG. 8B are inserted into the gap between the flat surface of the spacer 18 and the end surface of the coil 4. Press fit the wedge 19. Tension is applied to the arcuate yoke portion b of the wound core 11 through the spacer 18 in the direction of the arrow shown in FIG. 6 by press-fitting the wedge 19. The press-fitting of the wedge 19 not only serves as a means of applying tension, but also has the effect of fixing the coil 4.
Further, the spacer 18 and the wedge 19 are made of an insulating material such as a synthetic resin having excellent oil resistance and mechanical strength and are processed into a half-moon shape and a wedge shape.

尚、本発明はノーカツトの巻鉄心に実施した例
について説明したが、本発明はこれに限定するこ
となく、例えば、非晶質磁性薄帯を所要回数巻回
して継鉄部を弧状とした巻鉄心をつくり、この巻
鉄心の脚鉄部の切断場所を樹脂で固定してから巻
鉄心を切断し、このあと、コイルを各々の脚鉄部
に挿入して切断個所を樹脂により接着固定し、金
属テープとか絶縁テープ等を鉄心の外周に巻回し
てから、コイルと鉄心の継鉄部との間に前記同
様、スペーサおよびクサビを挿入して鉄心の継鉄
部に張力を与えるようにしても本発明は成立する
ものである。 Although the present invention has been described with reference to an example in which it is applied to an uncut wound core, the present invention is not limited thereto, and, for example, an amorphous magnetic ribbon may be wound a required number of times to form an arc-shaped yoke portion. An iron core is made, the cut places of the leg iron parts of this wound iron core are fixed with resin, and then the wound iron core is cut.After this, the coils are inserted into each leg iron part and the cut parts are fixed with adhesive with resin. You can also wrap a metal tape or insulating tape around the outer circumference of the iron core, and then insert a spacer or wedge between the coil and the yoke of the iron core to apply tension to the yoke of the iron core. The present invention is realized.

以上説明したように、本発明は非晶質磁性薄帯
を所定形状に巻回して成形した鉄心を、脚鉄部分
は弧状となしてほぼ矩形状に成形し、この鉄心の
脚鉄部にコイルを巻装してから、前記コイルの端
面と弧状に形成された継鉄部との間に半月状のス
ペーサとクサビを圧入せしめて、前記鉄心の継鉄
部に張力を付与させるようにしたもので、従来の
ように非晶質磁性薄帯を巻回した鉄心を、矩形芯
金と成形板とを用いて脚鉄部および継鉄部を外側
から強制的に押圧して矩形状に成形加工していた
場合の如く、鉄心自体にその成形加工時不要な歪
を与えて損失を増大させるようにしたものと異な
り、本発明は鉄心の脚鉄部分のみを押圧し継鉄部
は弧状のままにして鉄心をほぼ矩形状に成形する
ようにしたので、鉄心の成形時は、鉄心にほとん
ど歪が与えられないか、あるいは非常に少ないの
で、損失の増加はほとんど無視でき、変圧器鉄心
の成形時における磁気特性の低下を回避すること
ができる。又、変圧器鉄心の継鉄部は弧状に形成
されているので、この鉄心の脚鉄部にコイルを巻
装してから、このコイルの端面と前記弧状となつ
た継鉄との間に、継鉄部の弧状面と合致させた弧
状部を形成したスペーサを、クサビと共に圧入し
て挿着することにより、鉄心の弧状となした継鉄
部に張力を付与することが可能となるため、非晶
質磁性材料の特性を損うことなく有効にいかすこ
とができる。特に、継鉄部は全体的に弧状に形成
されているので、スペーサの圧入により継鉄部は
部分的でなく全体的に張力が与えられると共に、
この継鉄部に張力が与えられることによつて、鉄
心の成形時、脚鉄部内に生じる非晶質磁性薄帯の
たわみ部分が大部分直線状に修正することが可能
となり、それだけ張力のかかる鉄心部分を増すこ
とができるため、非晶質磁性材料を使用した鉄心
の低損失化を更にはかることができる。更に、ス
ペーサとクサビは鉄心の継鉄部に張力を付与する
他に、巻線を特別なコイル押え部材を用いること
なく固定することができる利点もある。 As explained above, in the present invention, an iron core is formed by winding an amorphous magnetic ribbon into a predetermined shape, the leg iron part is formed into an arc shape, and the leg iron part is formed into a substantially rectangular shape. After winding the coil, a half-moon spacer and a wedge are press-fitted between the end face of the coil and the arc-shaped yoke to apply tension to the yoke of the iron core. As in the past, an iron core wound with amorphous magnetic ribbon is formed into a rectangular shape by forcibly pressing the leg iron part and yoke part from the outside using a rectangular core metal and a forming plate. Unlike the case where the iron core itself is subjected to unnecessary strain during the forming process, which increases the loss, the present invention presses only the leg iron part of the iron core, and the yoke part remains arcuate. Since the core is formed into a nearly rectangular shape, the increase in loss can be ignored as there is little or very little strain on the core when forming the transformer core. It is possible to avoid deterioration of magnetic properties at times. Moreover, since the yoke of the transformer core is formed in an arc shape, after winding a coil around the leg part of the core, between the end face of the coil and the arc-shaped yoke, By press-fitting and inserting a spacer with an arc-shaped part that matches the arc-shaped surface of the yoke part together with a wedge, it is possible to apply tension to the arc-shaped yoke part of the iron core. Amorphous magnetic materials can be effectively used without impairing their properties. In particular, since the yoke is formed in an arc shape as a whole, by press-fitting the spacer, tension is applied to the yoke as a whole rather than partially.
By applying tension to this yoke, it is possible to correct most of the deflection of the amorphous magnetic ribbon that occurs in the leg iron during core forming into a straight line, and the tension is applied accordingly. Since the core portion can be increased, it is possible to further reduce the loss of the core using an amorphous magnetic material. Furthermore, the spacer and the wedge not only apply tension to the yoke portion of the iron core, but also have the advantage that the winding can be fixed without using a special coil holding member.

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

第１図は非晶質磁性薄帯を用いて変圧器鉄心の
巻回状態を示す概略図、第２図は従来の成形方法
を示す変圧器鉄心の概略平面図、第３図は巻線を
施した従来の変圧器鉄心を示す正面図、第４図は
非晶質磁性薄帯の損失特性図、第５図は本発明の
変圧器鉄心の成形状態を示す概略平面図、第６図
は本発明による変圧器鉄心の使用状態を概略図に
示す一部切欠正面図、第７図は本発明の鉄心に巻
線を施す場合の一実施例を示す斜視図、第８図Ａ
はスペーサの斜視図、第８図Ｂはクサビの斜視図
である。 １……芯金、２……成形板、４……コイル、１
１……巻鉄心、１８……スペーサ、１９……クサ
ビ、ａ……脚鉄部、ｂ……継鉄部。 Fig. 1 is a schematic diagram showing how a transformer core is wound using amorphous magnetic ribbon, Fig. 2 is a schematic plan view of a transformer core showing a conventional forming method, and Fig. 3 is a schematic diagram showing how a transformer core is wound using an amorphous magnetic ribbon. FIG. 4 is a loss characteristic diagram of an amorphous magnetic ribbon, FIG. 5 is a schematic plan view showing the state of forming the transformer core of the present invention, and FIG. 6 is a front view showing a conventional transformer core. FIG. 7 is a partially cutaway front view schematically showing how the transformer core according to the present invention is used; FIG. 7 is a perspective view showing an example of winding the core of the present invention; FIG. 8A
is a perspective view of a spacer, and FIG. 8B is a perspective view of a wedge. 1... Core metal, 2... Molded plate, 4... Coil, 1
1... Winding iron core, 18... Spacer, 19... Wedge, a... Leg iron part, b... Yoke part.

Claims (1)

【特許請求の範囲】[Claims] １ 非晶質磁性薄帯を所定形状に巻回して形成し
た鉄心を、脚鉄に相当する部分は直線状に、継鉄
に相当する部分は弧状となしてほぼ矩形状に成形
し、前記鉄心の脚鉄部にはコイルを巻装して、こ
のコイルの軸方向の端部と鉄心の継鉄部内側面と
の間に、絶縁材料からなる半月状のスペーサを継
鉄部の弧状面と合致させて遊合し、更に、前記ス
ペーサとコイル端面との隙間にクサビを圧入し
て、鉄心の継鉄部に張力を付与せしめるようにし
たことを特徴とする変圧器の鉄心構造。1. An iron core formed by winding an amorphous magnetic ribbon into a predetermined shape is formed into a substantially rectangular shape, with the part corresponding to the leg iron being straight and the part corresponding to the yoke being arcuate. A coil is wound around the leg iron of the iron, and a half-moon-shaped spacer made of insulating material is placed between the axial end of the coil and the inner surface of the yoke of the iron core, so that it matches the arcuate surface of the yoke. An iron core structure for a transformer, characterized in that a wedge is press-fitted into the gap between the spacer and the end face of the coil to apply tension to a yoke part of the iron core.