JPH04358003A - Powder magnetic core material and its production - Google Patents
Powder magnetic core material and its productionInfo
- Publication number
- JPH04358003A JPH04358003A JP2412309A JP41230990A JPH04358003A JP H04358003 A JPH04358003 A JP H04358003A JP 2412309 A JP2412309 A JP 2412309A JP 41230990 A JP41230990 A JP 41230990A JP H04358003 A JPH04358003 A JP H04358003A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- magnetic core
- core material
- temperature
- imide resin
- 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.)
- Withdrawn
Links
- 239000000843 powder Substances 0.000 title claims abstract description 42
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 41
- 239000011162 core material Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 150000003949 imides Chemical class 0.000 claims abstract description 13
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 23
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 abstract description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 abstract description 6
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 238000004898 kneading Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 25
- 238000002156 mixing Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 8
- 238000007580 dry-mixing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000815 supermalloy Inorganic materials 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は圧粉磁心材およびその製
造方法に関し、さらに詳しくは、ノイズフィルターやチ
ョークコイル等の電磁気部品として使用することができ
る低鉄損等磁気特性の優れた圧粉磁心材およびその製造
方法に関するものである。[Industrial Application Field] The present invention relates to a powder magnetic core material and a method for manufacturing the same, and more specifically to a powder having excellent magnetic properties such as low iron loss that can be used as electromagnetic parts such as noise filters and choke coils. The present invention relates to a magnetic core material and a method for manufacturing the same.
【０００２】0002
【従来技術】一般的に、磁心材はヒステリシス損および
渦電流損を生じ、この二つを合わせて鉄損となるもので
ある。2. Description of the Related Art Generally, magnetic core materials produce hysteresis loss and eddy current loss, and the sum of these two results in core loss.
【０００３】このヒステリシス損は、残留磁気を打ち消
すために消費するエネルギであり、保磁力（Ｈｃ）が低
いいほど小さいのであり、また、渦電流損は交番する磁
界において誘起される電流により生じるため、電気抵抗
が高いほど小さいのである。[0003] This hysteresis loss is energy consumed to cancel residual magnetism, and the lower the coercive force (Hc), the smaller it is, and the eddy current loss is caused by current induced in an alternating magnetic field. , the higher the electrical resistance, the smaller it is.
【０００４】従って、磁心材は鉄損の小さいものが要求
され、通常、絶縁皮膜処理を行った薄い鉄板を重ねた積
層構造のものが使用されているが、複雑な形状部品を製
作することは困難であった。[0004] Therefore, the magnetic core material is required to have a low iron loss, and a laminated structure consisting of thin iron plates treated with an insulating coating is usually used, but it is difficult to manufacture parts with complex shapes. It was difficult.
【０００５】一方、軟磁性粉末をエポキシ樹脂により被
覆して固化成形を行った圧粉磁心材は、通常の粉末成形
法を使用することにより、複雑な形状の部品を製作する
ことが可能であるが、粉末成形時に加圧されるので磁性
粉末に歪が導入され、そのため、磁心材としての磁気性
能が劣化するという問題がある。On the other hand, powder magnetic core materials made by covering soft magnetic powder with epoxy resin and solidifying it can be manufactured into parts with complex shapes by using ordinary powder molding methods. However, since it is pressurized during powder compaction, strain is introduced into the magnetic powder, which causes a problem in that the magnetic performance as a magnetic core material deteriorates.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記に説明し
たように従来における磁心材およびその製法の問題点に
鑑み、本発明者が鋭意研究を行った結果、磁気性能にも
優れており、プレス成形を行うことによって導入された
歪を解消した圧粉磁心材およびその製造方法を開発した
のである。[Problems to be Solved by the Invention] As explained above, in view of the problems of conventional magnetic core materials and their manufacturing methods, the present inventor has conducted extensive research, and as a result, the present invention has excellent magnetic performance. We have developed a powder magnetic core material that eliminates the strain introduced by press forming, and a method for manufacturing the same.
【０００７】[0007]
【課題を解決するための手段】本発明に係る圧粉磁心材
およびその製造方法は、６００℃以下の温度において焼
鈍回復可能な強磁性粉末を体積率５〜３０％のイミド樹
脂をバインダとして固化成形したことを特徴とする圧粉
磁心材を第１の発明とし、強磁性粉末とイミド樹脂、或
いは、溶剤により溶解したイミド樹脂を混合した後、プ
レス成形を行い、硬化後、６００℃以下の温度において
焼鈍を行うことを特徴とする磁気特性の優れた圧粉磁心
材の製造方法を第２の発明とする２つの発明よりなるも
のである。[Means for Solving the Problems] A powder magnetic core material and a method for manufacturing the same according to the present invention are characterized in that ferromagnetic powder that can be recovered by annealing at a temperature of 600°C or lower is solidified using an imide resin with a volume ratio of 5 to 30% as a binder. The first invention is a powder magnetic core material characterized in that it is molded, and after mixing ferromagnetic powder and imide resin or imide resin dissolved in a solvent, press molding is performed, and after curing, it is This invention consists of two inventions, the second invention being a method for manufacturing a powder magnetic core material with excellent magnetic properties, characterized by performing annealing at a high temperature.
【０００８】本発明に係る圧粉磁心材およびその製造方
法において使用される、強磁性粉末は保磁力（Ｈｃ）が
小さく、最大透磁率（μｍ）の大きいことが要求され、
従って、焼鈍回復温度の低い方が、例えば、回復温度の
低い強磁性粉末としては、電解鉄粉が挙げられるが、Ｏ
２を０．２〜０．３ｗｔ％含有するため還元焼鈍を行わ
なければ使用することができず、作業が繁雑となるばか
りか、高価になる。The ferromagnetic powder used in the powder magnetic core material and the manufacturing method thereof according to the present invention is required to have a small coercive force (Hc) and a large maximum magnetic permeability (μm).
Therefore, if the annealing recovery temperature is lower, for example, electrolytic iron powder can be mentioned as a ferromagnetic powder with a lower recovery temperature, but O
Since it contains 0.2 to 0.3 wt% of 2, it cannot be used unless reduction annealing is performed, which not only makes the work complicated but also makes it expensive.
【０００９】そのため、量産性がある水アトマイズ法に
よる鉄粉は、焼結用鉄粉として多量に製造されているが
、電解鉄粉に比較して不純物量が多い。しかし、溶製用
原料を厳格に選択することによって、還元焼鈍電解鉄粉
と同等の粉末を製造することができる。[0009] Therefore, iron powder produced by the water atomization method, which can be mass-produced, is produced in large quantities as iron powder for sintering, but it has a higher amount of impurities than electrolytic iron powder. However, by strictly selecting raw materials for melting, it is possible to produce powder equivalent to reduction annealed electrolytic iron powder.
【００１０】従って、本発明に係る圧粉磁心材およびそ
の製造方法においては、強磁性粉末として高純度鉄粉、
、３００ＮＨ、パーマロイを示したが、他に、軟磁性用
アモルファス、ニッケルを使用しても同じ効果を得るこ
とが可能である。Therefore, in the powder magnetic core material and the manufacturing method thereof according to the present invention, high-purity iron powder,
, 300NH, and permalloy are shown, but the same effect can be obtained by using other materials such as amorphous for soft magnetism and nickel.
【００１１】また、バインダーとしては、耐熱性および
成形性を有しており、量産化の行い易い材料が要求され
るのであり、耐熱性は無機質系が優れているが、成形性
の観点からは、強磁性粉末の表面皮膜が硬質化して密度
が上昇しにくくなるのに対して、樹脂系は無機質系に比
較して柔らかく、密度が上昇して磁気特性が優れている
と推定できる。そのため、樹脂としては耐熱性を有する
ものとしてはイミド樹脂が挙げられ、耐熱温度は４００
〜６００℃と優れている。そして、このイミド樹脂とし
て、商品名ＭＰ２０００Ｘ（三菱油化製）、ＭＰＩ−２
０（三井東圧製）、ＵＩＰ−Ｓ（宇部興産製）等のもの
が挙げられる。[0011] Furthermore, as a binder, a material is required that has heat resistance and moldability and is easy to mass produce.Inorganic materials are excellent in heat resistance, but from the viewpoint of moldability. It can be assumed that the surface coating of ferromagnetic powder becomes hard and the density is difficult to increase, whereas the resin-based powder is softer than the inorganic powder, and the density increases, resulting in excellent magnetic properties. Therefore, examples of resins that have heat resistance include imide resins, which have a heat resistance temperature of 400
-600℃, which is excellent. As this imide resin, the product name MP2000X (manufactured by Mitsubishi Yuka Co., Ltd.), MPI-2
0 (manufactured by Mitsui Toatsu) and UIP-S (manufactured by Ube Industries).
【００１２】そして、ＭＰ２０００Ｘは耐熱度が４８０
℃であり、容易に溶剤（アセトン、メチルエチルケトン
、クロロホルム等）に溶解する。また、ＭＰＩ−２０も
略同じ性質を有している。ＵＩＰ−Ｓは耐熱度６４０℃
と最高のものであるが、溶剤の適当なものがない。[0012]The heat resistance of MP2000X is 480
°C and easily dissolves in solvents (acetone, methyl ethyl ketone, chloroform, etc.). Moreover, MPI-20 also has substantially the same properties. UIP-S has a heat resistance of 640℃
Although it is the best, there is no suitable solvent.
【００１３】高純度鉄粉と樹脂粉末の混合法は、乾式混
合法と湿式混合法があり、乾式混合法はＭＰ２０００Ｘ
、ＭＰＩ−２０、ＵＩＰ−Ｓ等に適用が可能であり、湿
式混合法は溶剤に溶解するＭＰ２０００Ｘ、ＭＰＩ−２
０に適用することができる。[0013] There are two methods of mixing high-purity iron powder and resin powder: a dry mixing method and a wet mixing method, and the dry mixing method is MP2000X.
, MPI-20, UIP-S, etc., and the wet mixing method can be applied to MP2000X, MPI-2, etc. that are dissolved in a solvent.
0 can be applied.
【００１４】乾式混合法ではＶ型ミキサーを使用して混
合粉を製作し、湿式混合法ではＭＰ２０００Ｘをアセト
ンにより溶解し、ダクト内で高純度鉄粉に添加して流動
させながら混合乾燥した。その後、乾燥粉末は流動性向
上させるため＃６０篩を通過させた。[0014] In the dry mixing method, a mixed powder was prepared using a V-type mixer, and in the wet mixing method, MP2000X was dissolved in acetone, added to high-purity iron powder in a duct, mixed and dried while being fluidized. The dry powder was then passed through a #60 sieve to improve fluidity.
【００１５】成形体は１００トン粉末プレスを使用して
４．５トン／ｃｍ２の面圧により作成し、ＭＰ２０００
Ｘを使用した場合には、１００℃の温度において１時間
、続いて、１８０℃の温度に１時間、さらに、２５０℃
の温度に１時間で硬化後焼鈍を行い、また、ＵＩＰ−Ｓ
を使用した場合には、５００℃の温度に１時間で硬化後
焼鈍を行った。[0015] The compact was made using a 100 ton powder press with a surface pressure of 4.5 ton/cm2.
When using
After hardening, annealing is performed at a temperature of 1 hour, and UIP-S
In the case of using C., post-hardening annealing was performed at a temperature of 500.degree. C. for 1 hour.
【００１６】この場合、硬化、焼鈍温度が２５０℃を越
える時には、高純度鉄粉とバインダーの酸化を防止する
ためにアルゴン気流中において行った。そして、磁気特
性と比抵抗を測定することにより評価した。In this case, when the hardening and annealing temperature exceeded 250° C., the hardening and annealing were carried out in an argon stream to prevent oxidation of the high purity iron powder and the binder. Then, evaluation was made by measuring magnetic properties and specific resistance.
【００１６】磁気特性、特に、保磁力（Ｈｃ）は高純度
鉄粉ではどの条件においても、４５０℃の温度において
回復しているが、通常の鉄粉では回復温度は６００℃以
上を要した。Magnetic properties, particularly coercive force (Hc), were recovered at a temperature of 450°C under all conditions for high-purity iron powder, but recovery temperature of 600°C or higher was required for ordinary iron powder.
【００１７】比抵抗は乾式混合法によるＭＰ２０００Ｘ
およびＭＰＩ−２０では、４５０℃の温度までは０．０
１Ω・ｃｍ以上あるけれども、５００℃の温度で０．０
０１Ω・ｃｍとなり著しく低下する。また、湿式混合法
による場合は、劣化の傾向は乾式混合法の場合と同じで
あるが、劣化するまでの比抵抗は乾式混合法に比較して
高い。これは、湿式混合法の場合は乾式混合法の場合に
比較して、樹脂が高純度鉄粉に均一に付着しているもの
と考えられる。[0017] The specific resistance is determined by MP2000X using the dry mixing method.
and MPI-20, 0.0 up to a temperature of 450°C.
Although it is more than 1Ω・cm, it is 0.0 at a temperature of 500℃.
01Ω·cm, which is a significant decrease. Furthermore, in the case of the wet mixing method, the tendency of deterioration is the same as in the case of the dry mixing method, but the specific resistance until deterioration is higher than that in the dry mixing method. This is considered to be because the resin adheres more uniformly to the high-purity iron powder in the wet mixing method than in the dry mixing method.
【００１８】また、イミド樹脂では５００℃の温度まで
劣化しないが、６００℃以上の温度で比抵抗は０．００
０２Ω・ｃｍと低下する。従って、圧粉磁心材に必要な
低鉄損の磁心材の製造は高純度強磁性粉末において可能
となるものである。[0018] Furthermore, although imide resin does not deteriorate up to a temperature of 500°C, its specific resistance decreases to 0.00 at a temperature of 600°C or higher.
The resistance decreases to 0.02 Ω·cm. Therefore, it is possible to manufacture a magnetic core material with low core loss required for powder magnetic core material using high-purity ferromagnetic powder.
【００１９】[0019]
【実 施 例】本発明に係る圧粉磁心材およびその
製造方法の実施例を説明する。[Example] An example of the powder magnetic core material and the manufacturing method thereof according to the present invention will be described.
【００２０】[0020]
【実 施 例】表１および表２に高純度強磁性粉末の種
類と体積率（Ｖｆ）、バインダーの種類の体積率（Ｖｆ
）、混合方法、成形面圧、焼鈍温度、焼鈍後の相対密度
、磁気特性および比抵抗について示してある。[Example] Tables 1 and 2 show the types and volume fractions (Vf) of high-purity ferromagnetic powders, and the volume fractions (Vf) of binder types.
), mixing method, molding surface pressure, annealing temperature, relative density after annealing, magnetic properties, and specific resistance are shown.
【００２３】表１および表２により以下説明する。Ｎｏ
．１、Ｎｏ．２、Ｎ０．３はイミド樹脂の体積率（Ｖｆ
）を変えた場合を示し、粉末体積率（Ｖｆ）９５におい
ても従来の鉄粉に比べると、Ｈｃが同等、比抵抗が３桁
高くなっている。[0023] This will be explained below using Tables 1 and 2. No
．． 1.No. 2, N0.3 is the volume fraction of imide resin (Vf
), and even at a powder volume fraction (Vf) of 95, the Hc is the same and the specific resistance is three orders of magnitude higher than that of conventional iron powder.
【００２４】Ｎｏ．２、Ｎｏ．４、Ｎｏ．５、ＮＯ．６
は焼鈍温度を変えた場合で、Ｈｃは４００℃の温度で充
分低下していないが、この温度以上では一定となってお
り、比抵抗は４５０℃の温度では高いが、５００℃の温
度では０．０００１Ωめｃｍと著しく低下している。[0024]No. 2.No. 4.No. 5.No. 6
shows the case where the annealing temperature is changed; Hc does not decrease sufficiently at a temperature of 400°C, but remains constant above this temperature, and the resistivity is high at a temperature of 450°C, but decreases to 0 at a temperature of 500°C. It has decreased significantly to .0001Ωcm.
【００２５】Ｎｏ．２、Ｎｏ．５、Ｎｏ．７、Ｎｏ．８
は混合方法を変えた場合で、磁気特性には差は認められ
ないが、湿式混合法は乾式混合法に比べて比抵抗が高く
なっている。バインダーにＭＰＩ−２０を用いたＮｏ．
９では４５０℃の温度における磁気特性、比抵抗は同等
である。Ｎｏ．１０、Ｎｏ．１１はバインダーがＵＩＰ
−Ｓであり、６５０℃の温度における比抵抗が０．００
０２と大きく低下している。[0025]No. 2.No. 5, No. 7.No. 8
shows the case where the mixing method was changed, and although there is no difference in magnetic properties, the wet mixing method has a higher specific resistance than the dry mixing method. No. using MPI-20 as a binder.
No. 9 has the same magnetic properties and specific resistance at a temperature of 450°C. No. 10, No. 11, the binder is UIP
-S, and the specific resistance at a temperature of 650°C is 0.00
02, which is a significant decrease.
【００２６】Ｎｏ．１２、Ｎｏ．１３、Ｎｏ．１４は通
常の鉄粉を使用した場合で、Ｈｃが温度６００℃までは
充分に低下せず、高い耐熱度を有するイミド樹脂でも比
抵抗が６００℃以上の温度で急激に低下しているのに対
して、Ｎｏ．２、Ｎｏ．４、Ｎｏ．５、Ｎｏ．６からみ
て、高純度強磁性体の有利であることがわかる。[0026]No. 12, No. 13, No. 14 is the case when ordinary iron powder is used, and Hc does not decrease sufficiently at temperatures up to 600℃, and even though imide resin has high heat resistance, the resistivity decreases rapidly at temperatures above 600℃. On the other hand, No. 2.No. 4.No. 5, No. 6, it can be seen that high purity ferromagnetic material is advantageous.
【００２７】なお、Ｎｏ．１５はスーパーマロイの場合
でＮｏ．１０と同じことが言える。従って、Ｎｏ．１２
、Ｎｏ．１３、Ｎｏ．１４の本発明に係る圧粉磁心材お
よびその製造方法の範囲外のものは、劣っていることが
わかる。[0027] Furthermore, No. 15 is the No. 1 for super malloy. The same can be said for 10. Therefore, No. 12
, No. 13, No. It can be seen that the powder magnetic core material and the method for producing the same according to No. 14 of the present invention are inferior.
【００２８】[0028]
【発明の効果】以上説明したように、本発明に係る圧粉
磁心材およびその製造方法は上記の構成であるから、磁
気特性に優れた磁心材であり、ノイズフィルターおよび
チョークコイル、アクティブフィルター等の電磁気部品
に適した磁心材を得ることができるという効果を有して
いる。Effects of the Invention As explained above, since the powder magnetic core material and the method for manufacturing the same according to the present invention have the above-mentioned configuration, it is a magnetic core material with excellent magnetic properties, and can be used for noise filters, choke coils, active filters, etc. This has the effect that a magnetic core material suitable for electromagnetic parts can be obtained.
Claims (2)
な強磁性粉末を体積率５〜３０％のイミド樹脂をバイン
ダ−として固化成形したことを特徴とする圧粉磁心材。1. A powder magnetic core material comprising a ferromagnetic powder that can be recovered by annealing at a temperature of 600° C. or lower and is solidified and molded using an imide resin having a volume fraction of 5 to 30% as a binder.
剤により溶解したイミド樹脂を混合した後、プレス成形
を行い、硬化後、６００℃以下の温度において焼鈍を行
うことを特徴とする磁気特性の優れた圧粉磁心材の製造
方法。2. Magnetic properties characterized in that ferromagnetic powder and imide resin powder or imide resin dissolved in a solvent are mixed, then press molded, and after hardening, annealing is performed at a temperature of 600°C or less. A method for producing excellent powder magnetic core material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2412309A JPH04358003A (en) | 1990-12-20 | 1990-12-20 | Powder magnetic core material and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2412309A JPH04358003A (en) | 1990-12-20 | 1990-12-20 | Powder magnetic core material and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04358003A true JPH04358003A (en) | 1992-12-11 |
Family
ID=18521163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2412309A Withdrawn JPH04358003A (en) | 1990-12-20 | 1990-12-20 | Powder magnetic core material and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04358003A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0959480A2 (en) * | 1998-05-18 | 1999-11-24 | Daido Tokushuko Kabushiki Kaisha | Core material for noise filter |
| US6054210A (en) * | 1996-04-10 | 2000-04-25 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Molded magnetic article |
| US7423358B2 (en) * | 2003-08-26 | 2008-09-09 | Delta Electronics, Inc. | Stator structure and manufacturing method thereof |
| JP2009246398A (en) * | 1995-07-18 | 2009-10-22 | Vishay Dale Electronics Inc | Method for making high current low profile inductor |
| US7921546B2 (en) | 1995-07-18 | 2011-04-12 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
-
1990
- 1990-12-20 JP JP2412309A patent/JPH04358003A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009246398A (en) * | 1995-07-18 | 2009-10-22 | Vishay Dale Electronics Inc | Method for making high current low profile inductor |
| US7921546B2 (en) | 1995-07-18 | 2011-04-12 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| US7986207B2 (en) | 1995-07-18 | 2011-07-26 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| JP2012124513A (en) * | 1995-07-18 | 2012-06-28 | Vishay Dale Electronics Inc | High current thin inductor manufacturing method |
| JP2013084988A (en) * | 1995-07-18 | 2013-05-09 | Vishay Dale Electronics Inc | Method of manufacturing high-current thin inductor |
| US6054210A (en) * | 1996-04-10 | 2000-04-25 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Molded magnetic article |
| EP0959480A2 (en) * | 1998-05-18 | 1999-11-24 | Daido Tokushuko Kabushiki Kaisha | Core material for noise filter |
| EP0959480A3 (en) * | 1998-05-18 | 2000-03-15 | Daido Tokushuko Kabushiki Kaisha | Core material for noise filter |
| US6183657B1 (en) | 1998-05-18 | 2001-02-06 | Daido Tokushuko Kabushiki Kaisha | Core material for noise filter |
| US7423358B2 (en) * | 2003-08-26 | 2008-09-09 | Delta Electronics, Inc. | Stator structure and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980312 |