JPH065434A - Magnetic core - Google Patents

Magnetic core

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Publication number
JPH065434A
JPH065434A JP4138792A JP13879292A JPH065434A JP H065434 A JPH065434 A JP H065434A JP 4138792 A JP4138792 A JP 4138792A JP 13879292 A JP13879292 A JP 13879292A JP H065434 A JPH065434 A JP H065434A
Authority
JP
Japan
Prior art keywords
core
magnetic
butted
layer
magnetic core
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.)
Pending
Application number
JP4138792A
Other languages
Japanese (ja)
Inventor
Morikazu Yamada
盛一 山田
Etsuo Otsuki
悦夫 大槻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokin Corp
Original Assignee
Tokin Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokin Corp filed Critical Tokin Corp
Priority to JP4138792A priority Critical patent/JPH065434A/en
Publication of JPH065434A publication Critical patent/JPH065434A/en
Pending legal-status Critical Current

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  • Coils Or Transformers For Communication (AREA)

Abstract

PURPOSE:To improve magnetic characteristics of a magnetic core by forming a spinel structured layer on butted (abraded) surfaces of the core. CONSTITUTION:A magnetic core has at least two cores opposed on their butted surfaces, and comprises a spinel structured layer on the butted surfaces. The core is formed of ferrite. The layer is formed by coating the butted surfaces with at least one type of coating material selected from Fe(CO)5, FE2(CO)4, CO2(DC)8, Ni(CO)4 and Mn2(CO)10, and heat treating it. Thus, since the layer is formed on the butted surfaces, an air gap is scarcely generated on the butted portions, and magnetic characteristics are not reduced. Accordingly, when an inductor is manufactured by using the magnetic core, its inductance can be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明はインダクタに関し、特
に、少なくとも２個のコアが互いに突き合わせ面で突き
合わされた磁心に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor, and more particularly to a magnetic core in which at least two cores are butted against each other at butting surfaces.

【０００２】[0002]

【従来の技術】従来、複数のコアを互いに突き合わせた
磁心が知られており、この磁心には巻線が施されてイン
ダクタとして用いられる。そして、この種のインダクタ
では一般にコアとしてフェライトコアが用いられてい
る。なお、この種のインダクタとしては、例えば、トラ
ンス及びチョークがあり、ここでは、トランス及びチョ
ークを総称してインダクタと呼ぶものとする。2. Description of the Related Art Conventionally, a magnetic core in which a plurality of cores are butted against each other is known, and this magnetic core is wound to be used as an inductor. A ferrite core is generally used as the core in this type of inductor. Note that examples of this type of inductor include a transformer and a choke, and here, the transformer and the choke are collectively referred to as an inductor.

【０００３】一般に、電源回路に用いられるインダクタ
ではコイルを簡便に磁心に取り付けるため、予め巻コイ
ルが形成されたボビンを作成してこのボビン内に２分割
されたコアを挿入して磁心を構成してインダクタとして
いる。従って、このようなインダクタでは磁心には少な
くとも２カ所の分割面（突き合わせ面）が存在すること
になる。Generally, in an inductor used in a power supply circuit, a coil is easily attached to a magnetic core. Therefore, a bobbin having a wound coil formed in advance is formed, and a core divided into two is inserted into the bobbin to form the magnetic core. As an inductor. Therefore, in such an inductor, the magnetic core has at least two dividing surfaces (butting surfaces).

【０００４】通常、この分割面は研磨加工によって所定
の粗さに加工され、分割面同士がすり合わされている。
このような研磨加工に当たってはコストの面を考慮する
と精密に研磨加工を行うことが困難であり、このため、
一般には、数百番の砥粒の砥石を用いて一回の研磨加工
を行っている。Usually, this divided surface is processed into a predetermined roughness by polishing, and the divided surfaces are rubbed together.
In such a polishing process, it is difficult to perform a precise polishing process in consideration of the cost, and therefore,
In general, a single grinding process is performed using a grindstone of several hundreds of abrasive grains.

【０００５】[0005]

【発明が解決しようとする課題】ところで、上述のよう
にして研磨加工された分割面を突き合わせた際には、表
面粗さの精度が低いから、必然的に突き合わせ部分には
部分的に間隙が生ずることになる。つまり、突き合わせ
部分にエアーギャップが形成されることになる。この結
果、このエアーギャップによって磁心の透磁率が低下し
鉄損が増加することになる。従って、このようなフェラ
イト磁心は、材料自体が備える磁気特性よりもその磁気
特性が低下した状態で使用されることなる。By the way, when the divided surfaces polished as described above are butted against each other, the precision of the surface roughness is low. Will occur. That is, an air gap is formed at the butted portion. As a result, the air gap reduces the magnetic permeability of the magnetic core and increases the iron loss. Therefore, such a ferrite core is used in a state in which its magnetic characteristics are lower than those of the material itself.

【０００６】一方、例えば、環状磁心のように、複数の
コアを組み合わせることなく一体物として作成される磁
心では上述の問題点は存在しないが、このような磁心を
用いた場合には巻コイルの作成が完全自動化できないと
いう問題点がある。On the other hand, the above-mentioned problem does not exist in a magnetic core produced as an integrated body without combining a plurality of cores, such as an annular magnetic core, but when such a magnetic core is used, a winding coil There is a problem that the creation cannot be fully automated.

【０００７】本発明の目的は突き合わせ部分の存在によ
る磁気特性の低下を防止できる磁心を提供することにあ
る。An object of the present invention is to provide a magnetic core capable of preventing deterioration of magnetic characteristics due to the presence of abutting portions.

【０００８】[0008]

【課題を解決するための手段】本発明によれば、少なく
とも２個のコアが互いに突き合わせ面で突き合わされた
磁心において、前記突き合わせ面にはスピネル化層が形
成されていることを特徴とする磁心が得られる。そし
て、上述のコアはフェライト製であり、前記スピネル化
層は、Ｆｅ（ＣＯ）５，Ｆｅ２（ＣＯ）４，Ｃｏ２（Ｃ
Ｏ）８，Ｎｉ（ＣＯ）４，及びＭｎ２（ＣＯ）１０から
選択された少なくとも一種の塗布材料を前記突き合わせ
面に塗布して熱処理することによって形成される。According to the present invention, in a magnetic core in which at least two cores are butted against each other in a butted surface, a spinelized layer is formed at the butted surface. Is obtained. The core is made of ferrite and the spinelized layer is made of Fe (CO) 5 , Fe 2 (CO) 4 , Co 2 (C
It is formed by applying at least one coating material selected from O) 8 , Ni (CO) 4 , and Mn 2 (CO) 10 to the abutting surfaces and heat-treating the coating materials.

【０００９】[0009]

【作用】本発明では、コアの突き合わせ面にスピネル化
層を形成しているから、突き合わせ部分にエアーギャッ
プが生じることが極めて少なく、つまり、エアーギャッ
プにスピネル型磁性体が埋め込まれることになり、その
結果、磁気特性の低下が極めて少ない。In the present invention, since the spinelized layer is formed on the abutting surface of the core, an air gap is rarely generated in the abutting portion, that is, the spinel type magnetic body is embedded in the air gap. As a result, the deterioration of magnetic properties is extremely small.

【００１０】[0010]

【実施例】以下本発明について実施例によって説明す
る。EXAMPLES The present invention will be described below with reference to examples.

【００１１】実施例１ 図１を参照して、主成分組成がＦｅ２Ｏ３５２ｍｏｌ％
−ＭｎＯ３８ｍｏｌ％−ＺｎＯ１０ｍｏｌ％として添加
物としてＳｉＯ２及びＣａＯを添加した予熱粉末を準備
して、この予熱粉末を成形してＥ型コア１１及びＩ型コ
ア１２を作成した。Ｅ型コア１１は図示のようにその一
端部ａ乃至ｃが突き合わせ面として用いられ、Ｉ型コア
１２は一側面ｄが突き合わせ面として用いられる。そし
て、これら突き合わせ面ａ乃至ｄを＃３２０の砥石を用
いて研磨して研磨面とした。次にこれら研磨面に鉄カル
ボニルを塗布してＥ型コア１１の中央脚部１１ａにポリ
エステル被覆線ＰＥＷ−φ０．３の線材を巻線として用
いて巻線を施した後、Ｅ型コアの研磨面とＩ型コアの研
磨面とを突き合わせ、この突き合わせ状態を保持するた
め、Ｅ型コア１１とＩ型コア１２とをバネ（図示せず）
で固定した（以下この状態を固定体という）。Example 1 With reference to FIG. 1, the main component composition is Fe 2 O 3 52 mol%
Prepare the preheated powder added SiO 2 and CaO as additives as -MnO38mol% -ZnO10mol%, creating the E-shaped core 11 and the I-shaped core 12 by molding this preheating powder. As shown in the figure, the E-shaped core 11 has one end portions a to c used as a butting surface, and the I-shaped core 12 has one side surface d used as a butting surface. Then, these abutting surfaces a to d were polished with a # 320 grindstone to obtain polished surfaces. Next, iron carbonyl is applied to these polished surfaces to form a winding on the central leg portion 11a of the E-shaped core 11 by using a polyester coated wire PEW-φ0.3 as a winding wire, and then the E-shaped core is polished. Of the E-type core 11 and the I-type core 12 with a spring (not shown) for abutting the surface and the polished surface of the I-type core and maintaining the abutting state.
It was fixed with (hereinafter this state is called a fixed body).

【００１２】この固定体を窒素雰囲気中で温度３００℃
で２時間保持した後、室温まで冷却してインダクタ（以
下資料１と呼ぶ）とした。この資料１を観察したところ
Ｅ型コア１１とＩ型コア１２との接合部は黒く変色して
いた。そして、この資料１の実効透磁率を測定したとこ
ろ、３６００であった。This fixed body is heated in a nitrogen atmosphere at a temperature of 300.degree.
After holding for 2 hours at room temperature, it was cooled to room temperature and used as an inductor (hereinafter referred to as Document 1). Observation of this material 1 revealed that the joint between the E-shaped core 11 and the I-shaped core 12 was discolored black. Then, the effective magnetic permeability of Document 1 was measured and found to be 3600.

【００１３】一方、Ｅ型コア１１及びＩ型コア１２を用
いてその研磨面に鉄カルボニルを塗布しない状態で突き
合わせ、つまり、研磨面を直接突き合わせ、同様にして
巻線を施し上述の条件と同一の温度条件及び時間で熱処
理してインダクタ（以下資料２と呼ぶ）を作成した。そ
して、この資料２の実効透磁率を測定したところ、２１
００であった。このように、資料１は資料２に比べて透
磁率が約１．５倍高いことがわかる。さらに、資料１に
ついて接合部をＸ線を用いて回析したところスピネル化
層が形成されていることがわかった。On the other hand, the E-shaped core 11 and the I-shaped core 12 are butted against each other without iron carbonyl being applied to their polished surfaces, that is, the polished surfaces are directly butted and wound in the same manner as described above. An inductor (hereinafter referred to as Document 2) was prepared by heat treatment under the temperature conditions and time. Then, when the effective permeability of this material 2 was measured, it was 21
It was 00. Thus, it can be seen that the permeability of Material 1 is about 1.5 times higher than that of Material 2. Furthermore, when the junction part of Material 1 was diffracted using X-ray, it was found that a spinelized layer was formed.

【００１４】以上のように、Ｅ型コアとＩ型コアとの接
合部（つまり、突き合わせ面）にスピネル化層を形成す
ることによって実効透磁率を大きく向上させることがで
きる。As described above, the effective permeability can be greatly improved by forming the spinelized layer at the joint (that is, the abutting surface) between the E-type core and the I-type core.

【００１５】実施例２ 上述の実施例と同様にしてＥ型コア１１及びＩ型コア１
２とを作成した後、鉄カルボニルとマンガンカルボニル
とを重量比で６６．８対３３．２の割合で混合した混合
物を各コアの突き合わせ面に塗布した。そして、実施例
１と同一の線材を用いてＥ型コア１１の中央脚部１１ａ
に巻線を施した後、Ｅ型コア１１の研磨面とＩ型コア１
２の研磨面とを突き合わせ、この突き合わせ状態を保持
するため、Ｅ型コア１１とＩ型コア１２とをバネで固定
した。この固定体を窒素雰囲気中で温度３００℃に２時
間保持した後、室温まで冷却してインダクタ（以下資料
３という）を作成した。Embodiment 2 Similar to the embodiment described above, the E-shaped core 11 and the I-shaped core 1 are
After preparing No. 2 and No. 2, a mixture in which iron carbonyl and manganese carbonyl were mixed at a weight ratio of 66.8: 33.2 was applied to the abutting surface of each core. Then, using the same wire rod as in Example 1, the central leg portion 11a of the E-shaped core 11 is used.
After winding the wire, the polished surface of the E-shaped core 11 and the I-shaped core 1
The abraded surfaces of No. 2 were butted against each other, and the E-shaped core 11 and the I-shaped core 12 were fixed by a spring in order to maintain this butted state. After holding this fixed body at a temperature of 300 ° C. for 2 hours in a nitrogen atmosphere, it was cooled to room temperature to prepare an inductor (hereinafter referred to as Reference 3).

【００１６】次にこの資料３の実効透磁率を測定したと
ころ、３４５０であった。資料３の実効透磁率を資料２
の実効透磁率と比較すると、資料３ではその実効透磁率
が約１．５倍高いことがわかる。さらに、Ｅ型コア１１
とＩ型コア１２との接合部を観察したところ、スピネル
化層が形成されていることがわかった。Next, the effective magnetic permeability of the material 3 was measured and found to be 3450. The effective permeability of Document 3 is shown in Document 2
In comparison with the effective magnetic permeability of No. 3, it can be seen that the effective magnetic permeability of Document 3 is about 1.5 times higher. Furthermore, the E-shaped core 11
As a result of observing the joint between the and I-type core 12, it was found that a spinelized layer was formed.

【００１７】実施例３ 上述の実施例と同様にしてＥ型コア１１及びＩ型コア１
２とを作成した後、鉄カルボニルＦｅ（ＣＯ）５とニッ
ケルカルボニルＮｉ（ＣＯ）４とを重量比で７０対３０
の割合で混合した混合物を各コアの突き合わせ面に塗布
した。そして、実施例１と同一の線材を用いてＥ型コア
１１の中央脚部１１ａに巻線を施した後、Ｅ型コア１１
の研磨面とＩ型コア１２の研磨面とを突き合わせ、この
突き合わせ状態を保持するため、Ｅ型コア１１とＩ型コ
ア１２とをバネで固定した。この固定体を窒素雰囲気中
で温度３００℃に２時間保持した後、室温まで冷却して
インダクタ（以下資料４という）を作成した。Embodiment 3 Similar to the embodiment described above, the E-shaped core 11 and the I-shaped core 1 are used.
2 and then, iron carbonyl Fe (CO) 5 and nickel carbonyl Ni (CO) 4 in a weight ratio of 70:30
The mixture mixed in the ratio of was applied to the abutting surface of each core. Then, after winding the central leg portion 11a of the E-shaped core 11 using the same wire material as in Example 1, the E-shaped core 11 is wound.
The polishing surface of 1 and the polishing surface of the I-shaped core 12 were butted against each other, and in order to maintain this butted state, the E-shaped core 11 and the I-shaped core 12 were fixed by a spring. After holding this fixed body at a temperature of 300 ° C. for 2 hours in a nitrogen atmosphere, it was cooled to room temperature to prepare an inductor (hereinafter referred to as Material 4).

【００１８】次にこの資料４の実効透磁率を測定したと
ころ、３５６０であった。資料４の実効透磁率を資料２
の実効透磁率と比較すると、資料４ではその実効透磁率
が約１．５倍高いことがわかる。さらに、Ｅ型コア１１
とＩ型コア１２との接合部を観察したところ、スピネル
化層が形成されていることがわかった。Next, the effective magnetic permeability of the material 4 was measured and found to be 3560. The effective permeability of Document 4 is shown in Document 2
In comparison with the effective magnetic permeability of No. 2, it can be seen that the effective magnetic permeability of Document 4 is about 1.5 times higher. Furthermore, the E-shaped core 11
As a result of observing the joint between the and I-type core 12, it was found that a spinelized layer was formed.

【００１９】上述の実施例では熱処理温度及び熱処理時
間をそれぞれ３００℃及び２時間としたが、これら熱処
理温度及び熱処理時間は巻線として用いられる被覆線材
の材質によって異なり、一般に、線材の耐えられる温度
であれば高いほうが望ましいが、熱処理温度が８００℃
を越えると、フェライト特性が劣化するので、熱処理温
度は８００℃以下が望ましい。さらに、フェライト特性
の劣化を考慮すると熱処理時間は１０時間以下が望まし
い。In the above embodiments, the heat treatment temperature and the heat treatment time were 300 ° C. and 2 hours, respectively. However, the heat treatment temperature and the heat treatment time differ depending on the material of the coated wire used as the winding, and generally, the temperature that the wire can withstand. If it is higher, it is preferable, but the heat treatment temperature is 800 ℃.
If the temperature exceeds the range, the ferrite characteristics will deteriorate, so the heat treatment temperature is preferably 800 ° C. or lower. Further, considering the deterioration of ferrite characteristics, the heat treatment time is preferably 10 hours or less.

【００２０】また、上述の実施例では、鉄カルボニル
（Ｆｅ（ＣＯ）５）をコアの突き合わせ面に塗布してス
ピネル化層を形成すること及び鉄カルボニルとマンガン
カルボニルとを重量比で６６．８対３３．２の割合で混
合した混合物をコアの突き合わせ面に塗布してスピネル
化層を形成することについて説明したが、本発明ではＦ
ｅ（ＣＯ）５、Ｆｅ２（ＣＯ）４、Ｃｏ２（ＣＯ）８、
Ｎｉ（ＣＯ）４、及びＭｎ２（ＣＯ）１０から選択した
一種又は２種以上の混合物をコアの突き合わせ面に塗布
してスピネル化層を形成するようにすれば、同様に高い
実効透磁率を得ることができる。Further, in the above-mentioned embodiment, iron carbonyl (Fe (CO) 5 ) is applied to the abutting surfaces of the core to form a spinelized layer, and iron carbonyl and manganese carbonyl are used in a weight ratio of 66.8. It has been described that a mixture mixed in a ratio of 33.2 is applied to the abutting surface of the core to form the spinelized layer.
e (CO) 5 , Fe 2 (CO) 4 , Co 2 (CO) 8 ,
If a spinelized layer is formed by applying one or a mixture of two or more selected from Ni (CO) 4 and Mn 2 (CO) 10 to form a spinelized layer, similarly high effective magnetic permeability can be obtained. Obtainable.

【００２１】上述のようにして、コアの突き合わせ面に
スピネル化層を形成した際、つまり、鉄カルボニル、コ
バルトカルボニル、及びマンガンカルボニルをスピネル
化した際得られる化合物はそれぞれＦｅ３Ｏ４、Ｃｏ３
Ｏ４、及びＭｎ３Ｏ４であり、また、上記の３種類のカ
ルボニルの混合物を用いた際には（ＦｅＭｎＣｏ）３Ｏ
４のスピネル化層が得られる。そして、Ｆｅ３Ｏ４、Ｆ
ｅ２ＭｎＯ４、及びＣｏ３Ｏ４、の透磁率はそれぞれ約
１００、約８０、約２であり、空気に比べて高い値であ
る。従って、本発明ではこれらスピネル型磁性体が突き
合わせ面の間隙に埋め込まれることになるから、磁気抵
抗が小さくなって漏洩磁束が減少し、その結果、本発明
による磁心を用いてインダクタを製造した際にはインダ
クタンスが向上することになる。As described above, when the spinelized layer is formed on the abutting surface of the core, that is, when the iron carbonyl, cobalt carbonyl, and manganese carbonyl are spinelized, the compounds obtained are Fe 3 O 4 and Co 3 , respectively.
O 4 and Mn 3 O 4 , and (FeMnCo) 3 O when a mixture of the above three carbonyls is used.
A spinelized layer of 4 is obtained. And Fe 3 O 4 and F
The magnetic permeability of e 2 MnO 4 and Co 3 O 4 are about 100, about 80, and about 2, respectively, which are higher than those of air. Therefore, in the present invention, since these spinel type magnetic bodies are embedded in the gap between the abutting surfaces, the magnetic resistance is reduced and the leakage magnetic flux is reduced. As a result, when an inductor is manufactured using the magnetic core according to the present invention. The inductance will be improved.

【００２２】[0022]

【発明の効果】以上説明したように、本発明ではコアの
突き合わせ面（研磨面）にスピネル化層を形成するよう
にしたから、エアーギャップ（突き合わせ面の間隙）に
スピネル型磁性体が埋め込まれることになり、その結
果、磁気特性を良好でできるという効果がある。As described above, in the present invention, since the spinelized layer is formed on the abutting surface (polishing surface) of the core, the spinel type magnetic substance is embedded in the air gap (gap between the abutting surfaces). As a result, there is an effect that good magnetic characteristics can be obtained.

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

【図１】本発明によるＭｎ−Ｚｎフェライト磁心の一実
施例を説明するための図である。FIG. 1 is a diagram for explaining an example of a Mn—Zn ferrite magnetic core according to the present invention.

【符号の説明】[Explanation of symbols]

１１ Ｅ型コア １２ Ｉ型コア 11 E-type core 12 I-type core

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 少なくとも２個のコアが互いに突き合わ
せ面で突き合わされて接合された磁心において、前記突
き合わせ面にはスピネル化層が形成されていることを特
徴とする磁心。1. A magnetic core in which at least two cores are butted against each other at their abutting surfaces and are joined to each other, wherein a spinelized layer is formed on the abutting surfaces. 【請求項２】 請求項１に記載された磁心において、前
記コアはフェライト製であり、前記スピネル化層は、Ｆ
ｅ（ＣＯ）５，Ｆｅ２（ＣＯ）４，Ｃｏ２（ＣＯ）８，
Ｎｉ（ＣＯ）４，及びＭｎ２（ＣＯ）１０から選択され
た少なくとも一種の塗布材料を前記突き合わせ面に塗布
して熱処理することによって形成するようにしたことを
特徴とする磁心。2. The magnetic core according to claim 1, wherein the core is made of ferrite, and the spinel layer is F.
e (CO) 5 , Fe 2 (CO) 4 , Co 2 (CO) 8 ,
A magnetic core characterized in that it is formed by applying at least one coating material selected from Ni (CO) 4 and Mn 2 (CO) 10 to the abutting surfaces and heat-treating them.
JP4138792A 1992-04-21 1992-05-29 Magnetic core Pending JPH065434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4138792A JPH065434A (en) 1992-04-21 1992-05-29 Magnetic core

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4-101180 1992-04-21
JP10118092 1992-04-21
JP4138792A JPH065434A (en) 1992-04-21 1992-05-29 Magnetic core

Publications (1)

Publication Number Publication Date
JPH065434A true JPH065434A (en) 1994-01-14

Family

ID=26442094

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4138792A Pending JPH065434A (en) 1992-04-21 1992-05-29 Magnetic core

Country Status (1)

Country Link
JP (1) JPH065434A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002184634A (en) * 2000-11-30 2002-06-28 Taida Electronic Ind Co Ltd Method for forming inductor provided with on-piece core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002184634A (en) * 2000-11-30 2002-06-28 Taida Electronic Ind Co Ltd Method for forming inductor provided with on-piece core

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