JPH0319307A - Magnetic core - Google Patents
Magnetic coreInfo
- Publication number
- JPH0319307A JPH0319307A JP1154139A JP15413989A JPH0319307A JP H0319307 A JPH0319307 A JP H0319307A JP 1154139 A JP1154139 A JP 1154139A JP 15413989 A JP15413989 A JP 15413989A JP H0319307 A JPH0319307 A JP H0319307A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic core
- wound
- magnetic
- core
- gel
- 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
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229910052702 rhenium Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims 1
- 229910052748 manganese Inorganic materials 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 229910052761 rare earth metal Inorganic materials 0.000 claims 1
- 229910052706 scandium Inorganic materials 0.000 claims 1
- 229910052715 tantalum Inorganic materials 0.000 claims 1
- 229910052718 tin Inorganic materials 0.000 claims 1
- 229910052721 tungsten Inorganic materials 0.000 claims 1
- 229910052727 yttrium Inorganic materials 0.000 claims 1
- 229910052726 zirconium Inorganic materials 0.000 claims 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 8
- 230000035882 stress Effects 0.000 description 7
- 229920002379 silicone rubber Polymers 0.000 description 6
- 239000004945 silicone rubber Substances 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 5
- 239000005060 rubber Substances 0.000 description 5
- 239000004519 grease Substances 0.000 description 4
- 239000002966 varnish Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
- Soft Magnetic Materials (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は磁性合金薄帯をトロイダル状に巻き付けてなる
巻磁心に関するものである．
（従来の技術）
従来、磁性合金薄帯をトロイダル状に巻き付けて形威さ
れる巻磁心は，絶縁及び保護を目的としてケースに収納
されることがよく行なわれている．この巻磁心をケース
に収納するとき、磁心の固定及び緩衝を目的として、グ
リス、ワニス、ゴム等の充填剤を注入していた．
（発明が解決しようとする問題点）
従来の磁性合金薄帯の巻磁心において、特に、非品質合
金薄帯を用いたもの，又微細結晶粒を有する軟磁性合金
薄帯を用いたものは，外部応力に非常に弱い磁心であっ
た，そのため、磁心の固定及び緩衝のため用いるグリス
・ワニス・ゴム等の充填剤では、その充填により磁心に
応力が加わり磁心の磁気特性が劣化するという不具合が
あった．例えば，グリスを使用した場合、グリス注入時
に圧力を加える必要があるため、磁心に応力が加わって
しまい，又防錆効果も低い６又ワニス・ゴムを使用した
場合、ワニス・ゴムの硬化時の収縮による応力、又硬化
時に収縮の非常に小さいものを使用した場合でも硬化時
に加える熱による熱膨張及び室温に戻ったときの収縮に
よる応力が磁心に加わっていた．
本発明は、上記の事を鑑みて、応力による磁気特性の劣
化する磁性合金薄帯の巻磁心を，ケースに収納する場合
に、巻磁心に応力の加わらないようにし，磁気特性の劣
化を防止することを目的とする．
（問題点を解決するための手段）
本発明は、一般式：
（ＦｅＩ−ａ ’ａ ）１００−ｘ−ｙ−ｚ−ａ−ｆＪ
−ｒ ”ｘ ””ｙ ”ｚＭ’ Ｍ” Ｘ （原子
％）
α β γ
（ただし．ＭはＣＯ及び／又はＮｉであり、Ｍ′はＮｂ
．Ｗ．Ｔａ．Ｚｒ．Ｈｆ．Ｔｉ及びＭＯからなる群から
選ばれた少なくとも１種の元素であり、Ｍ”はＶ，Ｃｒ
，Ｍｎ．Ａｌ、Ｐｔ族，Ｓｃ．Ｙ、希土元索、Ａｕ．Ｚ
ｎ．Ｓｎ．Ｒｅからなる群から選ばれた少なくとも１種
の元素であり、ＸはＣ，Ｇａ，Ｐ．Ｇａ．Ｓｂ、Ｉｎ．
Ｂｅ．Ａｓからなる群から選ばれた少なくとも１種の元
素であり．ａ，ｘ．ｙ．ｚ、α，β及びγはそれぞれＯ
Ｓａ＜０．５、０．１≦Ｘ≦３． ０≦ｙ≦３０、０≦
２≦２４、Ｏ≦ｙ＋ｚ≦３５．０．１≦α≦３０，０≦
β≦ＩＯ及びＯ≦γ≦１０を満たす．）により表される
組成を有し、組成の少くとも５０％が，最大寸法で測定
した場合５００Ａ以下の平均粒径の結晶粒からなるＦｅ
基軟磁性合金薄帯をトロイダル状に巻き付けてなる巻磁
心をケースに収納してなる磁心において、前記ケース内
に前記巻磁心を固定する手段としてゲル状樹脂を用いた
ものである．
（実施例）
本発明に係る一実施例の断面図を第１図に示す．この実
施例Ａの磁心は，原子％でＣｕｌ％，Ｓｉ１３．４％．
Ｂ９．１％、Ｎｂ３．１％及び残部実質的にＦｅからな
る組成の溶湯から，片ロール法により幅１２ｍ，厚さ１
８μｍのほぼ完全な非晶質のリボンを作成し、次にこの
非品質リボンから内径１５ｉｗ及び外径２５ｍの巻磁心
を形成し、この巻磁心を、酸素濃度を１００ｐｐｍに調
整した窒素ガス雰囲気中で５４０℃で１時間熱処理を行
い、空冷による急冷を行なって巻磁心ｌを構威した．こ
の熱処理後のリボンの組織は，大部分が微細な結晶粒か
らなっており，この結晶粒の平均粒径は約１００人であ
った．
そして、ケース２の底部に，ゲル状シリコーンゴム３を
注入構成し、そのゲル状シリコーンゴム３上に前記巻磁
心ｌを挿入配置し，ゲル状シリコーンゴム３の粘着力及
び弾力により，巻磁心１の固定及び保護を行なっている
．その後，蓋部材（図示せず）を被せて、磁心を構成し
た．この実施例Ａでは、ゲル状シリコーンゴムで固定す
る前後での透磁率は，ほぼ一定であった．
また，本発明に係る別の実施例を第２図，第３図に示す
実施例Ｃは，ｍ心ｌの約半分をゲル状シリコーンゴム３
で覆ったものである．
この実施例Ａ，Ｂ，Ｃと、第２図及び第３図と同様の構
造で、接着用シリコーンゴムを用いた比較例を比較例Ｂ
，Ｃとし，これらの磁心においてゴム注入前後での透磁
率の変化率を第１表に示す．る別の実施例の断面図であ
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wound magnetic core formed by winding a magnetic alloy ribbon in a toroidal shape. (Prior Art) Conventionally, a wound magnetic core, which is formed by winding a magnetic alloy ribbon in a toroidal shape, is often housed in a case for the purpose of insulation and protection. When this wound core was housed in a case, fillers such as grease, varnish, and rubber were injected to secure and cushion the core. (Problems to be Solved by the Invention) Among conventional magnetic alloy ribbon wound cores, those using non-quality alloy ribbons and those using soft magnetic alloy ribbons having fine crystal grains have the following problems: The magnetic core was extremely susceptible to external stress.Therefore, the fillers used to fix and buffer the magnetic core, such as grease, varnish, and rubber, had the problem of adding stress to the magnetic core and deteriorating the magnetic properties of the magnetic core. there were. For example, when using grease, it is necessary to apply pressure when injecting the grease, which puts stress on the magnetic core, and when using 6-prong varnish/rubber, which has low rust prevention effects, when the varnish/rubber hardens. Stress due to shrinkage, and even if a material with very low shrinkage was used during curing, stress was applied to the magnetic core due to thermal expansion due to the heat applied during curing and shrinkage upon returning to room temperature. In view of the above, the present invention prevents the deterioration of the magnetic properties by preventing stress from being applied to the wound core of magnetic alloy ribbon when the wound core is housed in a case, whose magnetic properties deteriorate due to stress. The purpose is to (Means for Solving the Problems) The present invention provides a general formula: (FeI-a'a)100-x-y-z-a-fJ
−r ”x ””y ”zM' M” X (atomic %) α β γ (However, M is CO and/or Ni, M' is Nb
．． W. Ta. Zr. Hf. At least one element selected from the group consisting of Ti and MO, M'' is V, Cr
, Mn. Al, Pt group, Sc. Y., Gensaku Kido, Au. Z
n. Sn. At least one element selected from the group consisting of Re, and X is C, Ga, P. Ga. Sb, In.
Be. At least one element selected from the group consisting of As. a, x. y. z, α, β and γ are each O
Sa<0.5, 0.1≦X≦3. 0≦y≦30, 0≦
2≦24, O≦y+z≦35.0.1≦α≦30, 0≦
β≦IO and O≦γ≦10 are satisfied. ), in which at least 50% of the composition consists of crystal grains with an average grain size of 500 A or less when measured in the largest dimension.
In this magnetic core, a wound core formed by winding a thin strip of a soft magnetic alloy in a toroidal shape is housed in a case, and a gel-like resin is used as a means for fixing the wound core in the case. (Example) A cross-sectional view of an example according to the present invention is shown in Fig. 1. The magnetic core of this Example A has a Cu content of 13.4% and a Si content of 13.4%.
From a molten metal with a composition consisting of 9.1% B, 3.1% Nb, and the balance substantially Fe, it was rolled to a width of 12 m and a thickness of 1 by single roll method.
A nearly completely amorphous ribbon of 8 μm in diameter was created, and then a wound core with an inner diameter of 15 iw and an outer diameter of 25 m was formed from this non-quality ribbon, and this wound core was placed in a nitrogen gas atmosphere with an oxygen concentration adjusted to 100 ppm. Heat treatment was performed at 540°C for 1 hour, followed by quenching with air to prepare a wound magnetic core. The structure of the ribbon after this heat treatment consisted mostly of fine crystal grains, and the average grain size of these grains was about 100 grains. Then, a gel-like silicone rubber 3 is injected into the bottom of the case 2, and the wound magnetic core 1 is inserted and arranged on the gel-like silicone rubber 3, and the wound magnetic core 1 is It is fixed and protected. After that, a lid member (not shown) was placed on it to form a magnetic core. In this Example A, the magnetic permeability was almost constant before and after fixing with gel silicone rubber. In addition, in Example C shown in FIGS. 2 and 3, which is another example according to the present invention, about half of m core 1 is made of gel silicone rubber.
It is covered with Examples A, B, and C, and a comparative example using adhesive silicone rubber with the same structure as shown in FIGS. 2 and 3 are shown in Comparative Example B.
, C, and Table 1 shows the rate of change in magnetic permeability before and after rubber injection for these magnetic cores. FIG. 3 is a cross-sectional view of another embodiment;
処理前の透磁率
本発明では，ゲル状樹脂を用い、ゲル化後磁心を挿入す
る事により、磁性合金薄帯の層間への樹脂の浸透を防ぎ
，ゲル状樹脂の粘着力及び弾力により磁心の固定及び保
護を行うものである。これにより，磁心の特性劣化を防
止している．また、好ましくは、第１図に示した構造が
良く、磁心の底面のみで．ゲル状樹脂と接触しているも
のが良い．
（発明の効果）
本発明は、組織の少なくとも５０％が，最大寸法で測定
した場合５００λ以下の平均粒径の結晶粒である応力に
弱いＦｅ基軟磁性合金薄帯からなる巻磁心をケースに固
定する際、ゲル状樹脂を用いることにより特性劣化を防
ぐものであり、産業上極めて有益なものである．Magnetic permeability before treatment In the present invention, by using gel-like resin and inserting the magnetic core after gelling, the penetration of the resin between the layers of the magnetic alloy ribbon is prevented, and the adhesive force and elasticity of the gel-like resin allows the magnetic core to It is used for fixation and protection. This prevents the characteristics of the magnetic core from deteriorating. Preferably, the structure shown in FIG. 1 is good, and only the bottom surface of the magnetic core is used. One that is in contact with gel-like resin is best. (Effects of the Invention) The present invention provides a case for a wound magnetic core made of a stress-resistant Fe-based soft magnetic alloy ribbon in which at least 50% of the structure is crystal grains with an average grain size of 500λ or less when measured at the maximum dimension. The use of gel-like resin during fixation prevents deterioration of properties, making it extremely useful industrially.
第ｌ図は，本発明に係る一実施例の断面図であり、第２
図及び第３図は、それぞれの本発明に係上・巻磁心，２
・・・ケース、３・・・ゲル状シリコーンゴム。FIG. 1 is a sectional view of one embodiment according to the present invention, and FIG.
Figures 3 and 3 show the respective present invention with a fixed and wound magnetic core, 2
...Case, 3...Gel-like silicone rubber.
Claims (1)
−＿ｚ＿−＿α＿−＿β＿−＿γＣｕ＿ｘＳｉ＿ｙＢ＿
ｚＭ’＿αＭ”＿βＸ＿γ（原子％） （ただし、ＭはＣｏ及び／又はＮｉであり、Ｍ’はＮｂ
、Ｗ、Ｔａ、Ｚｒ、Ｈｆ、Ｔｉ及びＭｏからなる群から
選ばれた少なくとも１種の元素であり、Ｍ”はＶ，Ｃｒ
、Ｍｎ、Ａｌ、Ｐｔ族、Ｓｃ、Ｙ、希土元素、Ａｕ、Ｚ
ｎ、Ｓｎ、Ｒｅからなる群から選ばれた少なくとも１種
の元素であり、ＸはＣ、Ωｅ、Ｐ、Ｇａ、Ｓｂ、Ｉｎ、
Ｂｅ、Ａｓからなる群から選ばれた少なくとも１種の元
素であり、ａ、ｘ、ｙ、ｚ、α、β及びγはそれぞれ０
≦ａ＜０．５、０．１≦ｘ≦３、０≦ｙ≦３０、０≦ｚ
≦２４、０≦ｙ＋ｚ≦３５、０．１≦α≦３０．０≦β
≦１０及び０≦γ≦１０を満たす。）により表される組
成を有し、組成の少くとも５０％が、最大寸法で測定し
た場合５００Å以下の平均粒径の結晶粒からなるＦｅ基
軟磁性合金薄帯をトロイダル状に巻き付けてなる巻磁心
をケースに収納してなる磁心において、前記ケース内に
前記巻磁心を固定する手段としてゲル状樹脂を用いたこ
とを特徴とする磁心。1. General formula: (Fe_1_-_aM_a)100_-_x_-_y_
−＿z＿−＿α＿−＿β＿−＿γCu_xSi_yB_
zM'_αM"_βX_γ (atomic %) (M is Co and/or Ni, M' is Nb
, W, Ta, Zr, Hf, Ti and Mo, and M'' is V, Cr.
, Mn, Al, Pt group, Sc, Y, rare earth elements, Au, Z
is at least one element selected from the group consisting of n, Sn, and Re, and X is C, Ωe, P, Ga, Sb, In,
At least one element selected from the group consisting of Be, As, and a, x, y, z, α, β, and γ are each 0
≦a<0.5, 0.1≦x≦3, 0≦y≦30, 0≦z
≦24, 0≦y+z≦35, 0.1≦α≦30.0≦β
≦10 and 0≦γ≦10 are satisfied. ), in which at least 50% of the composition consists of crystal grains with an average grain size of 500 Å or less when measured in the largest dimension, wound in a toroidal shape. A magnetic core comprising a magnetic core housed in a case, characterized in that a gel-like resin is used as means for fixing the wound magnetic core in the case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1154139A JPH0654738B2 (en) | 1989-06-16 | 1989-06-16 | Magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1154139A JPH0654738B2 (en) | 1989-06-16 | 1989-06-16 | Magnetic core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0319307A true JPH0319307A (en) | 1991-01-28 |
| JPH0654738B2 JPH0654738B2 (en) | 1994-07-20 |
Family
ID=15577739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1154139A Expired - Lifetime JPH0654738B2 (en) | 1989-06-16 | 1989-06-16 | Magnetic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0654738B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2674674A1 (en) * | 1991-03-27 | 1992-10-02 | Merlin Gerin | HOMOPOLAR TRANSFORMER WITH MAGNETIC CIRCUIT INSENSITIVE TO MECHANICAL STRESSES, AND MANUFACTURING METHOD. |
| EP0585650A1 (en) * | 1992-08-22 | 1994-03-09 | Robert Bosch Gmbh | Transducer and its application |
| FR2711461A1 (en) * | 1993-08-11 | 1995-04-28 | Siemens Matsushita Components | Electrical component made in the manner of a chip. |
| EP0794541A1 (en) * | 1996-03-07 | 1997-09-10 | Alps Electric Co., Ltd. | Pulse transformer magnetic core |
| WO2009012938A1 (en) * | 2007-07-24 | 2009-01-29 | Vacuumschmelze Gmbh & Co. Kg | Magnet core, method for its production and residual current device |
| CN110352464A (en) * | 2017-02-22 | 2019-10-18 | 日立金属株式会社 | Magnetic core unit, current transformer and their manufacturing method |
| DE102024132988A1 (en) | 2024-09-20 | 2026-03-26 | GM Global Technology Operations LLC | Throttle system for reducing DC currents in AC drive systems |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825449A (en) * | 1981-08-05 | 1983-02-15 | Toshiba Corp | Amorphous magnetic alloy for magnetic head |
| JPS59158504A (en) * | 1983-02-28 | 1984-09-08 | Matsushita Electric Works Ltd | Magnetic core |
| JPS63302504A (en) * | 1987-06-02 | 1988-12-09 | Hitachi Metals Ltd | Magnetic core and manufacture thereof |
| JPH044393A (en) * | 1990-04-20 | 1992-01-08 | Hitachi Ltd | Piping vibration damping elements, piping equipped with vibration damping elements, and pressure transmission equipment equipped with vibration damping elements |
-
1989
- 1989-06-16 JP JP1154139A patent/JPH0654738B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825449A (en) * | 1981-08-05 | 1983-02-15 | Toshiba Corp | Amorphous magnetic alloy for magnetic head |
| JPS59158504A (en) * | 1983-02-28 | 1984-09-08 | Matsushita Electric Works Ltd | Magnetic core |
| JPS63302504A (en) * | 1987-06-02 | 1988-12-09 | Hitachi Metals Ltd | Magnetic core and manufacture thereof |
| JPH044393A (en) * | 1990-04-20 | 1992-01-08 | Hitachi Ltd | Piping vibration damping elements, piping equipped with vibration damping elements, and pressure transmission equipment equipped with vibration damping elements |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2674674A1 (en) * | 1991-03-27 | 1992-10-02 | Merlin Gerin | HOMOPOLAR TRANSFORMER WITH MAGNETIC CIRCUIT INSENSITIVE TO MECHANICAL STRESSES, AND MANUFACTURING METHOD. |
| EP0585650A1 (en) * | 1992-08-22 | 1994-03-09 | Robert Bosch Gmbh | Transducer and its application |
| FR2711461A1 (en) * | 1993-08-11 | 1995-04-28 | Siemens Matsushita Components | Electrical component made in the manner of a chip. |
| CN1069145C (en) * | 1996-03-06 | 2001-08-01 | 阿尔卑斯电气株式会社 | Magnetic core of pulse transformer |
| EP0794541A1 (en) * | 1996-03-07 | 1997-09-10 | Alps Electric Co., Ltd. | Pulse transformer magnetic core |
| WO2009012938A1 (en) * | 2007-07-24 | 2009-01-29 | Vacuumschmelze Gmbh & Co. Kg | Magnet core, method for its production and residual current device |
| US8344830B2 (en) | 2007-07-24 | 2013-01-01 | Vaccumschmelze Gmbh & Co. Kg | Magnet core; method for its production and residual current device |
| CN110352464A (en) * | 2017-02-22 | 2019-10-18 | 日立金属株式会社 | Magnetic core unit, current transformer and their manufacturing method |
| EP3588518A4 (en) * | 2017-02-22 | 2020-04-22 | Hitachi Metals, Ltd. | MAGNETIC CORE UNIT, CURRENT TRANSFORMER AND MANUFACTURING METHOD THEREOF |
| CN110352464B (en) * | 2017-02-22 | 2021-02-19 | 日立金属株式会社 | Magnetic core unit, current transformer, and method for manufacturing the same |
| DE102024132988A1 (en) | 2024-09-20 | 2026-03-26 | GM Global Technology Operations LLC | Throttle system for reducing DC currents in AC drive systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0654738B2 (en) | 1994-07-20 |
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