JPH05109545A - Iron core - Google Patents
Iron coreInfo
- Publication number
- JPH05109545A JPH05109545A JP3099054A JP9905491A JPH05109545A JP H05109545 A JPH05109545 A JP H05109545A JP 3099054 A JP3099054 A JP 3099054A JP 9905491 A JP9905491 A JP 9905491A JP H05109545 A JPH05109545 A JP H05109545A
- Authority
- JP
- Japan
- Prior art keywords
- iron core
- magnetic material
- soft magnetic
- silicon steel
- steel plate
- 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
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- Soft Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、モーターや変圧器など
電磁機器に使用される鉄心に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron core used in electromagnetic equipment such as motors and transformers.
【０００２】[0002]
【従来の技術】従来、鉄心としては、ケイ素鋼板を板厚
０．３〜０．７ｍｍの薄板とし、ワックス、酸化被膜等
の絶縁体により絶縁した前記ケイ素鋼板の薄板を複数枚
積層したものが多く用いられている。2. Description of the Related Art Conventionally, as an iron core, a thin silicon steel plate having a thickness of 0.3 to 0.7 mm and a plurality of thin silicon steel plates which are insulated by an insulator such as a wax or an oxide film are laminated. Many are used.
【０００３】一般に、電気抵抗が比較的低く透磁率の高
い材料を交番磁界のもとで磁化すると、磁化の変化に伴
って磁性体内に渦電流が流れ、これによってジュール熱
が発生して電磁エネルギーの熱損失が起こる。前記熱損
失は、渦電流損失と呼ばれ、周波数の２乗に比例して増
加する。In general, when a material having a relatively low electric resistance and a high magnetic permeability is magnetized under an alternating magnetic field, an eddy current flows in the magnetic body in accordance with the change in the magnetization, which causes Joule heat to generate electromagnetic energy. Heat loss occurs. The heat loss is called eddy current loss and increases in proportion to the square of the frequency.
【０００４】高周波における磁化の際に渦電流を低下さ
せる方法としては、電気抵抗の大きな材料を使用し、板
厚を薄くすることが有効であることが知られている。そ
こで、前記従来の鉄心では、鋳鋼に比較して電気抵抗が
大きいケイ素鋼板を使用し、かつ、その板厚を前記の範
囲の薄板とすることにより、高周波における磁化の際に
渦電流損失を低下させることができる。しかしながら、
前記従来の鉄心では、ケイ素鋼板の薄板を絶縁体を介し
て積層するので、積層体全体に対する磁性体（ケイ素鋼
板）の体積の割合（占積率）が９０〜９７％となり、積
層体と同体積のケイ素鋼板に比較してヒステリシス損、
磁束密度、励磁特性等の磁気特性が不十分になる傾向が
ある。As a method for reducing the eddy current when magnetizing at a high frequency, it is known that it is effective to use a material having a large electric resistance and reduce the plate thickness. Therefore, in the conventional iron core, a silicon steel plate having a larger electric resistance than cast steel is used, and the plate thickness is a thin plate within the above range, thereby reducing eddy current loss during magnetization at high frequency. Can be made However,
In the above conventional iron core, thin silicon steel plates are laminated via an insulator, so that the volume ratio (space factor) of the magnetic body (silicon steel plate) to the entire laminate is 90 to 97%, which is the same as that of the laminate. Hysteresis loss compared to volume silicon steel plate,
Magnetic characteristics such as magnetic flux density and excitation characteristics tend to be insufficient.
【０００５】一方、近年電気抵抗の大きな材料としてア
モルファス軟磁性材料が開発され、該アモルファス軟磁
性材料を使用する鉄心が提案されている。前記アモルフ
ァス軟磁性材料は、アモルファス材料の特性として透磁
率が高いので、鉄心として有利に使用できることが期待
される。On the other hand, in recent years, an amorphous soft magnetic material has been developed as a material having a large electric resistance, and an iron core using the amorphous soft magnetic material has been proposed. Since the amorphous soft magnetic material has a high magnetic permeability as a characteristic of the amorphous material, it is expected that it can be advantageously used as an iron core.
【０００６】アモルファス軟磁性材料を使用する鉄心材
料として、例えば、特開昭５８─１７５６５４号公報に
は、高温で溶融させた合金を超急冷して得られたアモル
ファス合金のリボンを高耐熱性高分子化合物を主成分と
する接着剤を用いて圧接してなる鉄心材料が開示されて
いる。前記公報記載の鉄心材料では、高周波において磁
化する際に渦電流損失が低減されるとともに、ヒステリ
シス損、磁束密度、励磁特性等においても十分な磁気特
性が得られる。尚、前記鉄心材料において、前記接着剤
は絶縁体として作用している。As an iron core material using an amorphous soft magnetic material, for example, Japanese Patent Laid-Open No. 58-175654 discloses a ribbon of an amorphous alloy obtained by ultra-quenching an alloy melted at a high temperature. An iron core material is disclosed which is pressure-bonded using an adhesive containing a molecular compound as a main component. In the iron core material described in the above publication, eddy current loss is reduced when magnetized at a high frequency, and sufficient magnetic characteristics are obtained in terms of hysteresis loss, magnetic flux density, excitation characteristics and the like. In the iron core material, the adhesive acts as an insulator.
【０００７】ところが、前記鉄心材料で鉄心を製造した
場合には、アモルファス軟磁性材料自体が高価であるた
めに、製品価格の上昇が避けられない。また、前記鉄心
材料は、高耐熱性高分子化合物を主成分とする接着剤を
用いて積層しているが、該接着剤層は厚さのコントロー
ルが難しく、絶縁体層に要求される均一性が得られにく
い。さらに、前記接着剤のために熱変形しやすいとの不
都合もある。However, when an iron core is manufactured from the iron core material, the amorphous soft magnetic material itself is expensive, so that an increase in product price cannot be avoided. Further, the iron core material is laminated by using an adhesive containing a high heat-resistant polymer compound as a main component, but it is difficult to control the thickness of the adhesive layer, and the uniformity required for the insulating layer is obtained. Is difficult to obtain. Further, there is a disadvantage in that the adhesive is easily deformed by heat.
【０００８】[0008]
【発明が解決しようとする課題】かかる不都合を解消し
て、本発明の目的は、占積率を低下させることなしに、
高周波で磁化する際に渦電流損失が低減される、安価な
鉄心を提供することにある。また、本発明の目的は一体
的に形成された変形しにくい鉄心を提供することにもあ
る。SUMMARY OF THE INVENTION It is an object of the present invention to eliminate such inconvenience and to reduce the space factor without decreasing the space factor.
An object of the present invention is to provide an inexpensive iron core in which eddy current loss is reduced when magnetized at a high frequency. Another object of the present invention is to provide an integrally formed core which is not easily deformed.
【０００９】[0009]
【課題を解決するための手段】かかる目的を達成するた
めに本発明者らは種々検討を重ね、多結晶軟磁性材料と
アモルファス軟磁性材料とを交互に積層すると、占積率
を低下させることなしに高周波で磁化する際に渦電流損
失が低減され、高い一体性の付与された鉄心が安価に得
られることを見いだし、本発明を完成した。In order to achieve the above object, the inventors of the present invention have made various studies, and if a polycrystalline soft magnetic material and an amorphous soft magnetic material are alternately laminated, the space factor is lowered. The present invention has been completed by finding that an eddy current loss can be reduced when magnetized at a high frequency without using a magnet, and an iron core having high integrity can be obtained at low cost.
【００１０】即ち、本発明の鉄心は、厚さ０．１ｍｍ以
上の多結晶軟磁性材料と、厚さ１０μｍ以上のアモルフ
ァス軟磁性材料とを交互に積層し、機械的に接合させて
なることを特徴とする。That is, the iron core of the present invention is formed by alternately laminating a polycrystalline soft magnetic material having a thickness of 0.1 mm or more and an amorphous soft magnetic material having a thickness of 10 μm or more and mechanically joining them. Characterize.
【００１１】本発明において、前記アモルファス軟磁性
材料は、鉄、コバルト、ニッケル等を含む多結晶軟磁性
材料の一部をアモルファス化することにより形成され
る。前記アモルファス化は、前記多結晶軟磁性材料にレ
ーザー溶射する等の方法により行われる。In the present invention, the amorphous soft magnetic material is formed by amorphizing a part of a polycrystalline soft magnetic material containing iron, cobalt, nickel or the like. The amorphization is performed by a method such as laser spraying on the polycrystalline soft magnetic material.
【００１２】[0012]
【作用】かかる手段によれば、多結晶軟磁性材料とアモ
ルファス軟磁性材料との間に異種材料の界面が形成され
る。このような界面では接触抵抗が大きくなるので、該
界面は実質的に絶縁体として作用する。According to such means, an interface of different materials is formed between the polycrystalline soft magnetic material and the amorphous soft magnetic material. Since the contact resistance increases at such an interface, the interface substantially acts as an insulator.
【００１３】本発明の鉄心は、前記作用により磁性体の
薄板の間に絶縁体を介在させる必要がなく、また、交互
に積層した多結晶軟磁性材料とアモルファス軟磁性材料
とを接着剤を用いずに機械的に接合させてなるので、磁
性体の占積率が向上するとともに耐熱性が向上される。In the iron core of the present invention, it is not necessary to interpose an insulator between thin plates of magnetic material due to the above-mentioned action, and a polycrystalline soft magnetic material and an amorphous soft magnetic material which are alternately laminated are used with an adhesive. Since they are mechanically joined together, the space factor of the magnetic material is improved and the heat resistance is improved.
【００１４】また、本発明の鉄心は前記構成とすること
により磁性体の全てをアモルファス軟磁性材料で構成す
るよりも安価であり、一方アモルファス軟磁性材料は多
結晶軟磁性材料よりも透磁率が高い磁性体であるので前
記鉄心の一部を該アモルファス軟磁性材料で構成するこ
とにより同体積の多結晶軟磁性材料より優れた磁気特性
が得られる。Further, the iron core of the present invention is less expensive than the case where all the magnetic bodies are made of the amorphous soft magnetic material by the above constitution, while the amorphous soft magnetic material has a magnetic permeability higher than that of the polycrystalline soft magnetic material. Since it is a high magnetic material, by forming a part of the iron core with the amorphous soft magnetic material, magnetic characteristics superior to those of the polycrystalline soft magnetic material of the same volume can be obtained.
【００１５】さらに、本発明ではアモルファス軟磁性材
料を多結晶軟磁性材料の一部をアモルファス化して形成
することにより、磁性体全体が共通の材料で構成され、
一体性が強くなり、より熱変形しにくくなる。Further, in the present invention, the amorphous soft magnetic material is formed by amorphizing a part of the polycrystalline soft magnetic material, so that the entire magnetic body is made of a common material.
Strengthens the unity and makes it more difficult to be thermally deformed.
【００１６】[0016]
【実施例】次に、添付の図面を参照しながら、本発明の
鉄心材料についてさらに詳しく説明する。図１は本実施
例の鉄心を用いるモータの構成を示す説明的断面図、図
２は図１のＩＩ─ＩＩ線縦断面図である。The core material of the present invention will now be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory sectional view showing the structure of a motor using the iron core of this embodiment, and FIG. 2 is a vertical sectional view taken along the line II--II of FIG.
【００１７】本実施例の鉄心は、図１に示すような構成
を有するモータ１に使用される。モータ１は、中央部の
回転軸３の回りに略円筒形状に永久磁石２が備えられ、
永久磁石２の外周には略円筒形の電機子鉄心４が設置さ
れている。The iron core of this embodiment is used in the motor 1 having the structure shown in FIG. The motor 1 is provided with a permanent magnet 2 in a substantially cylindrical shape around a rotating shaft 3 in a central portion,
A substantially cylindrical armature core 4 is installed on the outer circumference of the permanent magnet 2.
【００１８】電機子鉄心４には、スロット５が設けられ
ており、スロット５で区切られた空間には、電機子巻線
（マグネットワイヤ）６が巻付けられている。A slot 5 is provided in the armature core 4, and an armature winding (magnet wire) 6 is wound around the space defined by the slot 5.
【００１９】鉄心４は、図２に示すように、方向性ケイ
素鋼板２１とアモルファス合金２２とが交互に積層され
て構成され、かしめ止めにより機械的に接合されてい
る。As shown in FIG. 2, the iron core 4 is formed by alternately laminating grain-oriented silicon steel plates 21 and amorphous alloy 22 and mechanically joined by caulking.
【００２０】方向性ケイ素鋼板２１は、約３重量％のケ
イ素を含有する鋼板で比重７．６５（ｇ／ｃｍ3 ）、比
電気抵抗４５〜４８（μΩ・ｃｍ）、最大透磁率５３〜
８６×１０3 、飽和磁束密度２．０３（Ｔ）の物性を有
している。本実施例では、厚さ０．３ｍｍの方向性ケイ
素鋼板２１を使用している。The grain-oriented silicon steel plate 21 is a steel plate containing about 3% by weight of silicon and has a specific gravity of 7.65 (g / cm 3 ), a specific electric resistance of 45 to 48 (μΩ · cm), and a maximum magnetic permeability of 53 to 53.
It has physical properties of 86 × 10 3 and a saturation magnetic flux density of 2.03 (T). In this embodiment, a grain-oriented silicon steel plate 21 having a thickness of 0.3 mm is used.
【００２１】アモルファス合金２２は、方向性ケイ素鋼
板２１の表面をレーザー溶射することにより形成されて
いる。前記方法により形成されるアモルファス合金２２
の厚さは１０〜１００μｍ程度である。The amorphous alloy 22 is formed by laser spraying the surface of the grain-oriented silicon steel plate 21. Amorphous alloy 22 formed by the above method
Has a thickness of about 10 to 100 μm.
【００２２】鉄系アモルファス合金としては、ケイ素１
０重量％、ホウ素１２重量％を含むもの、ケイ素８重量
％、ホウ素１０重量％を含むもの、ケイ素４重量％、ホ
ウ素１３重量％、炭素２重量％を含むもの、ケイ素３．
５重量％、ホウ素１３重量％、炭素１．５重量％を含む
もの等が知られている。前記鉄系アモルファス合金は、
比電気抵抗１２５〜１５５（μΩ・ｃｍ）、飽和磁束密
度１５．６〜１６．１（ｋＧ）、直流保磁力０．００８
〜０．０６（Ｏｅ）の物性を有している。尚、透磁率μ
は、磁束密度Ｂ及び磁場Ｈとの間にＢ＝μＨの関係を有
する量である。As an iron-based amorphous alloy, silicon 1
2. 0% by weight, 12% by weight boron, 8% by weight silicon, 10% by weight boron, 4% by weight silicon, 13% by weight boron, 2% by weight carbon, silicon 3.
Those containing 5% by weight, 13% by weight of boron and 1.5% by weight of carbon are known. The iron-based amorphous alloy is
Specific electric resistance 125-155 (μΩ · cm), saturation magnetic flux density 15.6-16.1 (kG), DC coercive force 0.008
It has a physical property of 0.06 (Oe). The magnetic permeability μ
Is an amount having a relationship of B = μH between the magnetic flux density B and the magnetic field H.
【００２３】鉄心４において、方向性ケイ素鋼板２１と
アモルファス合金２２との界面２３は異種材料の境界と
なっており、十分大きな接触抵抗が得られるので、実質
的に絶縁層として作用する。従って、鉄心４は全体が電
気抵抗及び透磁率の大きい磁性体で占められていて、か
つ、該磁性体の薄板が絶縁体を介して積層されていると
きと同様の効果が得られ、高周波で磁化する際に渦電流
損失が著しく低減される。In the iron core 4, the interface 23 between the grain-oriented silicon steel plate 21 and the amorphous alloy 22 is a boundary of different materials, and a sufficiently large contact resistance can be obtained, so that it substantially acts as an insulating layer. Therefore, the iron core 4 is wholly occupied by a magnetic material having a large electric resistance and magnetic permeability, and the same effect as when the thin plates of the magnetic material are laminated via an insulator can be obtained. Eddy current losses are significantly reduced when magnetized.
【００２４】本実施例の鉄心４は、次のようにして有利
に製造することができる。The iron core 4 of this embodiment can be advantageously manufactured as follows.
【００２５】まず、前記物性を有する方向性ケイ素鋼板
の平板の表面をレーザー溶射して、該方向性ケイ素鋼板
の一部に前記厚さのアモルファス合金層を形成する。次
に、表面に前記厚さのアモルファス合金層が形成された
方向性ケイ素鋼板の平板を、方向性ケイ素鋼板のアモル
ファス化されていない部分２１とアモルファス化されて
いる部分２２が交互に配置されるようにして、所定の枚
数積層する。次に、前記平板を所定の枚数が積層された
状態で、大略円筒状の鉄心４の形状に打ち抜く。そし
て、最後に、大略円筒状の平板を所定の枚数が積層され
た状態で、円筒状平板の円周上の４か所乃至８か所に凸
状の押圧部材を圧接してかしめ止めし、機械的に接合さ
せて鉄心４を形成する。First, the surface of the flat plate of the grain-oriented silicon steel sheet having the above-mentioned physical properties is laser-sprayed to form an amorphous alloy layer having the above-mentioned thickness on a part of the grain-oriented silicon steel sheet. Next, the flat plate of the grain-oriented silicon steel sheet on which the amorphous alloy layer having the above-mentioned thickness is formed is alternately arranged with the non-amorphized portion 21 and the amorphized portion 22 of the grain-oriented silicon steel sheet. In this way, a predetermined number of sheets are laminated. Next, in a state where a predetermined number of the flat plates are stacked, the flat plates are punched out into a substantially cylindrical shape of the iron core 4. Then, finally, in a state in which a predetermined number of substantially cylindrical flat plates are stacked, convex pressing members are pressure-contacted at four to eight positions on the circumference of the cylindrical flat plates to prevent caulking, The iron core 4 is formed by mechanically joining.
【００２６】前記機械的接合は、非導電性の材料からな
るボルトを用いて、ボルト締めすることによって行って
もよい。The mechanical joining may be performed by bolting with a bolt made of a non-conductive material.
【００２７】尚、本実施例は鉄心４がケースに固定され
ている電機子固定型のモータを例にとって説明している
が、本発明が電機子回転型（アウタ・ロータ型）モータ
についても適用できることは勿論である。In the present embodiment, the armature fixed type motor in which the iron core 4 is fixed to the case is described as an example, but the present invention is also applied to an armature rotating type (outer rotor type) motor. Of course you can.
【００２８】[0028]
【発明の効果】以上のことから明らかなように、本発明
の鉄心では、多結晶軟磁性材料とアモルファス軟磁性材
料との界面が実質的に絶縁体として作用するので、磁性
体の薄板の間に絶縁体を介在させる必要がなく、また、
交互に積層した多結晶軟磁性材料とアモルファス軟磁性
材料とを接着剤を用いずに機械的に接合させてなるの
で、磁性体の占積率を向上させることができるととも
に、接着剤層を使用したときのような熱変形を回避する
ことができる。As is apparent from the above, in the iron core of the present invention, since the interface between the polycrystalline soft magnetic material and the amorphous soft magnetic material substantially acts as an insulator, it is possible to reduce the gap between the magnetic thin plates. There is no need to interpose an insulator on the
Since the alternately laminated polycrystalline soft magnetic material and amorphous soft magnetic material are mechanically joined without using an adhesive, the space factor of the magnetic material can be improved and an adhesive layer is used. It is possible to avoid the thermal deformation that occurs when doing.
【００２９】また、本発明の鉄心は多結晶軟磁性材料と
アモルファス軟磁性材料とを交互に積層してなるので磁
性体の全てをアモルファス軟磁性材料で構成するよりも
安価であり、一方アモルファス軟磁性材料は多結晶軟磁
性材料よりも透磁率が高い磁性体であるので前記鉄心の
一部を該アモルファス軟磁性材料で構成することにより
同体積の多結晶軟磁性材料より優れた磁気特性を得るこ
とができる。Further, since the iron core of the present invention is formed by alternately laminating the polycrystalline soft magnetic material and the amorphous soft magnetic material, it is cheaper than the case where all the magnetic bodies are made of the amorphous soft magnetic material. Since the magnetic material is a magnetic material having a magnetic permeability higher than that of the polycrystalline soft magnetic material, a magnetic property superior to that of the polycrystalline soft magnetic material having the same volume can be obtained by configuring a part of the iron core with the amorphous soft magnetic material. be able to.
【００３０】従って、本発明によれば、占積率を低下さ
せることなしに、高周波で磁化する際に渦電流損失を低
減することができ、熱変形しにくい安価な鉄心を得るこ
とができる。Therefore, according to the present invention, it is possible to reduce the eddy current loss when magnetizing at a high frequency without lowering the space factor, and to obtain an inexpensive iron core which is resistant to thermal deformation.
【００３１】さらに、本発明ではアモルファス軟磁性材
料を多結晶軟磁性材料の一部をアモルファス化して形成
しているので、磁性体全体が共通の材料で構成され、強
固な一体性が付与され、より変形しにくい鉄心を得るこ
とができる。Further, in the present invention, since the amorphous soft magnetic material is formed by amorphizing a part of the polycrystalline soft magnetic material, the whole magnetic body is made of a common material, and strong integrity is imparted. It is possible to obtain an iron core that is less likely to be deformed.
【図面の簡単な説明】[Brief description of drawings]
【図１】本実施例の鉄心を用いるモータの構成を示す説
明的断面図。FIG. 1 is an explanatory cross-sectional view showing a configuration of a motor using an iron core of this embodiment.
【図２】図１のＩＩ─ＩＩ線縦断面図。FIG. 2 is a vertical sectional view taken along line II-II of FIG.
４…鉄心、２１…方向性ケイ素鋼板、２２…アモルファ
ス合金、２３…界面4 ... Iron core, 21 ... Directional silicon steel plate, 22 ... Amorphous alloy, 23 ... Interface
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０１Ｆ 3/00 4231−5Ｅ 41/02 Ｂ 8019−5Ｅ Ｃ 8019−5Ｅ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location H01F 3/00 4231-5E 41/02 B 8019-5E C 8019-5E
Claims (2)
と、厚さ１０μｍ以上のアモルファス軟磁性材料とを交
互に積層し、機械的に接合させてなることを特徴とする
鉄心。1. An iron core, characterized in that a polycrystalline soft magnetic material having a thickness of 0.1 mm or more and an amorphous soft magnetic material having a thickness of 10 μm or more are alternately laminated and mechanically joined.
晶軟磁性材料の一部をアモルファス化して得られたもの
であることを特徴とする請求項１記載の鉄心。2. The iron core according to claim 1, wherein the amorphous soft magnetic material is obtained by amorphizing a part of the polycrystalline soft magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3099054A JPH05109545A (en) | 1991-04-30 | 1991-04-30 | Iron core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3099054A JPH05109545A (en) | 1991-04-30 | 1991-04-30 | Iron core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05109545A true JPH05109545A (en) | 1993-04-30 |
Family
ID=14236923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3099054A Pending JPH05109545A (en) | 1991-04-30 | 1991-04-30 | Iron core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05109545A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09213516A (en) * | 1996-02-06 | 1997-08-15 | Mitsui Petrochem Ind Ltd | Magnetic core manufacturing method and apparatus |
| EP1481795A1 (en) * | 2002-02-12 | 2004-12-01 | Mitsui High-tec, Inc. | Different materials-laminate metal plate and different materials-laminate core, and method of producing the same |
| US7821177B2 (en) | 2007-03-20 | 2010-10-26 | Nippon Soken, Inc. | Laminated core |
-
1991
- 1991-04-30 JP JP3099054A patent/JPH05109545A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09213516A (en) * | 1996-02-06 | 1997-08-15 | Mitsui Petrochem Ind Ltd | Magnetic core manufacturing method and apparatus |
| EP1481795A1 (en) * | 2002-02-12 | 2004-12-01 | Mitsui High-tec, Inc. | Different materials-laminate metal plate and different materials-laminate core, and method of producing the same |
| EP1481795A4 (en) * | 2002-02-12 | 2009-11-11 | Mitsui High Tec | Different materials-laminate metal plate and different materials-laminate core, and method of producing the same |
| US7821177B2 (en) | 2007-03-20 | 2010-10-26 | Nippon Soken, Inc. | Laminated core |
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