JPH08734Y2 - Magnetic core - Google Patents
Magnetic coreInfo
- Publication number
- JPH08734Y2 JPH08734Y2 JP1990102580U JP10258090U JPH08734Y2 JP H08734 Y2 JPH08734 Y2 JP H08734Y2 JP 1990102580 U JP1990102580 U JP 1990102580U JP 10258090 U JP10258090 U JP 10258090U JP H08734 Y2 JPH08734 Y2 JP H08734Y2
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- Japan
- Prior art keywords
- peripheral surface
- magnetic core
- inner peripheral
- outer peripheral
- noise
- Prior art date
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Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は作動時に発生する騒音を低減できるようにし
た磁心に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnetic core capable of reducing noise generated during operation.
一般にコイルを巻回した磁心は、スイッチング電源の
チョークコイルのように、負荷が周期的にオン・オフさ
れる態様で使用すると、振動を起こすことが知られてい
る。そして、そのスイッチング周波数が可聴帯域内にあ
るとこれが騒音となって周囲に伝搬したり、周囲の部品
を振動させて作動特性の劣化を招くことがある。It is generally known that a magnetic core around which a coil is wound causes vibration when used in a mode in which a load is periodically turned on / off like a choke coil of a switching power supply. If the switching frequency is in the audible band, it may become noise and propagate to the surroundings, or vibrate surrounding parts to deteriorate the operating characteristics.
前記した発音現象は特に、小さな直流重畳電流に対し
て高いイダクタンスを有する一方、大きな直流重畳電流
に対して低いインダクタンスを有する磁気回路、即ち、
多出力用のスイッチング電源のチョークコイルとして理
想的な特性を有するものほど騒音が大きいという問題が
あり、性能と騒音との面でジレンマがある。The above-mentioned sounding phenomenon is particularly a magnetic circuit having a high inductance for a small direct current superposition current while having a low inductance for a large direct current superposition current, that is,
A choke coil of a switching power supply for multiple outputs has a problem that the noise is larger as it has ideal characteristics, and there is a dilemma in terms of performance and noise.
ところが、磁心にスリットを形成すると、強度が低下
して共振しやすくなり振動や騒音が増大することは避け
られない。However, when a slit is formed in the magnetic core, it is inevitable that the strength is lowered and resonance is likely to occur, thereby increasing vibration and noise.
そこで、騒音を低減するためにギャップの近傍を固定
したもの（特願昭61-55242号）がある。しかし、ギャッ
プの近傍を固定したものでは、その固定強度によっては
騒音低減効果にバラツキが生じることがあり、またギャ
ップの近傍で生じた騒音を事後に抑制するものであるた
め、効果に限界がある。Therefore, there is a device (Japanese Patent Application No. 61-55242) in which the vicinity of the gap is fixed in order to reduce noise. However, in the case where the vicinity of the gap is fixed, the noise reduction effect may vary depending on the fixing strength, and since the noise generated near the gap is suppressed after the fact, the effect is limited. .
本考案は前記事項に鑑みてなされたもので、大幅な騒音
の低減を図った磁心を提供することを技術的課題とす
る。The present invention has been made in view of the above matters, and an object thereof is to provide a magnetic core in which noise is significantly reduced.
本考案は前記技術的課題を解決するために、以下のよ
うな構成とした。The present invention has the following configuration in order to solve the above technical problems.
本考案の磁心における第１の特徴は、環状で断面角形
に形成され、外周面と内周面とを有し、これら外周面と
内周面の夫々の一方の縁同士を連結する第１の側面と、
前記外周面と前記内周面との夫々の他方の縁同士を連結
する第２の側面とを有し、前記第１の側面又は前記第２
の側面のいずれか一方の前記側面にのみ切込み溝が計２
箇所以上形成されていることにある。A first feature of the magnetic core of the present invention is that it is formed in an annular shape with a rectangular cross section, has an outer peripheral surface and an inner peripheral surface, and connects the respective outer edges of the outer peripheral surface and the inner peripheral surface to each other. Side and
A second side surface connecting the other edges of the outer peripheral surface and the inner peripheral surface to each other, and the first side surface or the second side surface.
There are a total of 2 notches on only one of the two sides.
It is formed in more than one place.
また、本考案の磁心における第２の特徴は、環状で断
面角形に形成され、外周面と内周面とを有し、これら外
周面と内周面との夫々の一方の縁同士を連結する第１の
側面と、前記外周面と前記内周面との夫々の他方の縁同
士を連結する第２の側面とを有し、前記第１の側面から
第２の側面に向けて侵入する切込み溝と前記第２の側面
から第１の側面に向けて侵入する切込み溝とをそれぞれ
対向させて計２箇所以上形成したことにある。A second feature of the magnetic core of the present invention is that it is annular and has a rectangular cross section, has an outer peripheral surface and an inner peripheral surface, and connects the respective edges of the outer peripheral surface and the inner peripheral surface. A notch that has a first side surface and a second side surface that connects the other edges of the outer peripheral surface and the inner peripheral surface to each other, and penetrates from the first side surface toward the second side surface. The groove and the cut groove that penetrates from the second side surface toward the first side surface are formed facing each other at a total of two or more positions.
更に、本考案の磁心における第３の特徴は、環状で断
面角形に形成され、外周面と内周面とを有し、これら外
周面と内周面の夫々の一方の縁同士を連結する第１の側
面と、外周面と内周面との夫々の他方の縁同士を連結す
る第２の側面とを有し、前記内周面から前記外周面に向
けて侵入し又は前記外周面から前記内周面に向けて侵入
する切込み溝が計２箇所以上形成されていることにあ
る。Furthermore, a third feature of the magnetic core of the present invention is that it is formed in an annular shape with a rectangular cross section, has an outer peripheral surface and an inner peripheral surface, and connects one edge of each of the outer peripheral surface and the inner peripheral surface. 1 side surface and a second side surface that connects the other edges of the outer peripheral surface and the inner peripheral surface, respectively, and penetrates from the inner peripheral surface toward the outer peripheral surface or from the outer peripheral surface. There are a total of two or more cut grooves that penetrate toward the inner peripheral surface.
更に、本考案の磁心における第４の特徴は、本考案の
磁心における前記第１、第２、又は第３の特徴に加え
て、前記切込み溝の面積を全断面の40％から75％とした
ことを特徴とする。Further, the fourth feature of the magnetic core of the present invention is that, in addition to the first, second or third feature of the magnetic core of the present invention, the area of the cut groove is 40% to 75% of the entire cross section. It is characterized by
アモルファス金属としては、Fe−B,Fe−Ｂ−C,Fe−Ｂ
−Si,Fe−Ｂ−Si−C,Fe−Ｂ−Si-Cr,Fe-Co−Ｂ−Si,Fe-
Ni-Mo−Ｂ等のFe等、Co−B,Co-Fe-Si−B,Co-Fe-Ni-Mo−
Ｂ−Si,Co-Fe-Ni−Ｂ−Si,Co-Fe-Mn−Ｂ−Si,Co-Fe-Mn-
Ni,Co-Mn-Ni−Ｂ−Si,Co-Fe-Mn-Ni−Ｂ等のCo系等を例
示できる。Amorphous metals include Fe-B, Fe-BC, Fe-B
-Si, Fe-B-Si-C, Fe-B-Si-Cr, Fe-Co-B-Si, Fe-
Fe such as Ni-Mo-B, Co-B, Co-Fe-Si-B, Co-Fe-Ni-Mo-
B-Si, Co-Fe-Ni-B-Si, Co-Fe-Mn-B-Si, Co-Fe-Mn-
Examples include Co-based materials such as Ni, Co-Mn-Ni-B-Si, and Co-Fe-Mn-Ni-B.
また、アモルファス以外でも、Fe-Si−Ｂ−Cu-Nb系合
金などのFe系微結晶軟磁性材を使用できる。In addition to amorphous, Fe-based microcrystalline soft magnetic material such as Fe-Si-B-Cu-Nb-based alloy can be used.
磁心の騒音がいかにして発生するかを解析したとこ
ろ、以下の事項が明らかになった。即ち、磁心の騒音レ
ベルは励磁される磁束密度が高い程大きくなる。Analysis of how the magnetic core noise is generated revealed the following. That is, the noise level of the magnetic core increases as the excited magnetic flux density increases.
そして、磁束密度の大きさは磁心にかかる磁場が大き
くなるほど大きくなるが、磁心にかかる磁場値は磁心の
中心からの距離に反比例するため、ギャップがない状態
では磁心の内側ほど大きくなる。The magnitude of the magnetic flux density increases as the magnetic field applied to the magnetic core increases, but since the magnetic field value applied to the magnetic core is inversely proportional to the distance from the center of the magnetic core, the magnetic flux density increases toward the inside of the magnetic core when there is no gap.
このため、ギャップ形成にあっては、ギャップのない
状態で磁束密度が高くなる部分、即ち、磁心の内側にギ
ャップを形成するのが好適である。さらに、環状磁心の
第１の側面または第２の側面部分の内、少なくとも一方
を切断することによっても磁束の集中を抑制する効果が
あることがわかった。さらに、全幅のギャップを形成し
たものに比較して機械強度が増大するため、共振の抑制
が図られる。また、共振周波数も高くなるため可聴帯域
におけるレスポンスが低下して騒音防止上有利となる。Therefore, in forming the gap, it is preferable to form the gap inside the magnetic core where the magnetic flux density is high without the gap. Further, it has been found that cutting at least one of the first side surface and the second side surface portion of the annular magnetic core has an effect of suppressing the concentration of magnetic flux. Further, the mechanical strength is increased as compared with the case where the gap having the full width is formed, so that the resonance can be suppressed. In addition, since the resonance frequency also becomes high, the response in the audible band is lowered, which is advantageous for noise prevention.
そして環状磁心の第１の側面に溝を形成することによ
って、騒音を最大12dB低減することができた。これは、
特に、内外径比が大きく、磁心の内側に磁束が集中しや
すい磁心に対して有効であった。By forming a groove on the first side surface of the annular magnetic core, noise could be reduced by up to 12 dB. this is,
In particular, it was effective for a magnetic core having a large inner / outer diameter ratio and in which magnetic flux easily concentrates inside the magnetic core.
なお、特開昭59-144113号公報には環状磁心の上面に
切り込み形成した図が示されている。これは磁心の磁気
特性（インダクタンス／重畳直流電流値）を改善する目
的を以て、磁心の或る１箇所にだけに切断部分を形成し
たものであって、騒音の低減については何の記載もな
く、騒音の低減を図る本考案とは異なっている。It should be noted that JP-A-59-144113 discloses a drawing in which a notch is formed on the upper surface of an annular magnetic core. For the purpose of improving the magnetic characteristics (inductance / superimposed DC current value) of the magnetic core, a cut portion is formed only at a certain portion of the magnetic core, and there is no description about noise reduction. This is different from the present invention which aims to reduce noise.
本考案の実施例を第１図ないし第８図に基づいて説明
する。An embodiment of the present invention will be described with reference to FIGS.
〈第１実施例〉 第１実施例を第１図により説明する。磁心１は、アモ
ルファス金属、Fe78Si9B13（原子％）の薄板を巻回する
ことによって、外径の直径25mm、内径の直径15mm、上面
から下面までの厚さ10mmの環状コアとしたものである。
その断面は角型となっており、外周面５と内周面６とを
有し、これら外周面５と内周面６の夫々の一方の縁同士
を連結する第１の側面（上面）２と、外周面５と内周面
６との夫々の他方の縁同士を連結する第２の側面（下
面）４とを有する。この磁心１の第１の側面２と第２の
側面４は平面となっている。また外周面５と内周面６は
円形になっている。前記第１の側面２には第２の側面４
方向に向かって侵入する切込み溝３が形成されている。
この切込み溝３は円周上において０度と180度の部分、
即ち、対向して２箇所形成されており、切込み溝３の深
さｈは6mm、幅ｔは0.8mmになっている。これにより切断
部分の面積は全断面積の60％となっている。<First Embodiment> A first embodiment will be described with reference to FIG. The magnetic core 1 is formed by winding a thin plate of amorphous metal, Fe 78 Si 9 B 13 (atomic%) into an annular core having an outer diameter of 25 mm, an inner diameter of 15 mm, and a thickness of 10 mm from the upper surface to the lower surface. It is a thing.
The cross section thereof is square and has an outer peripheral surface 5 and an inner peripheral surface 6, and a first side surface (upper surface) 2 that connects the respective edges of the outer peripheral surface 5 and the inner peripheral surface 6 to each other. And a second side surface (lower surface) 4 connecting the other edges of the outer peripheral surface 5 and the inner peripheral surface 6, respectively. The first side surface 2 and the second side surface 4 of the magnetic core 1 are flat surfaces. The outer peripheral surface 5 and the inner peripheral surface 6 are circular. A second side surface 4 is provided on the first side surface 2.
A cut groove 3 is formed so as to penetrate in the direction.
This cut groove 3 is a portion of 0 degrees and 180 degrees on the circumference,
That is, it is formed at two positions facing each other, and the depth h of the cut groove 3 is 6 mm and the width t is 0.8 mm. As a result, the area of the cut portion is 60% of the total cross-sectional area.
以下、騒音の実験結果を第６図ないし第８図により説
明する。The noise experimental results will be described below with reference to FIGS. 6 to 8.
第６図は多重正弦波（周波数範囲１〜20KHzで出力電
圧が一定）で励振した時の周波数10KHzにおける磁束密
度と騒音の音圧レベルとの関係を示すグラフ、第７図は
励振周波数5KHzに対して周波数5KHzの発生音レベルを示
すグラフ、第８図は励振周波数5KHzに対し周波数10KH
z、即ち、第２高調波の発生音レベルを示すグラフであ
る。いずれのグラフにおいても磁心をノンリニアチョー
クとして使用した結果である。Fig. 6 is a graph showing the relationship between the magnetic flux density at a frequency of 10 KHz and the sound pressure level of noise when excited with a multiple sine wave (output voltage is constant in the frequency range of 1 to 20 KHz), and Fig. 7 is at an excitation frequency of 5 KHz. On the other hand, a graph showing the generated sound level of frequency 5KHz, Fig. 8 shows frequency 10KH for excitation frequency 5KHz.
7 is a graph showing z, that is, the generated sound level of the second harmonic. In all graphs, the results are obtained by using the magnetic core as a non-linear choke.
第６図において、Ａは前記した本実施例の磁心１を示
し、Ｂはギャップのない磁心、Ｃは比較対象として試作
したものであり、磁心１の外周面５に深さ3mm、幅0.8mm
の切込み溝３を形成したものである。In FIG. 6, A is the magnetic core 1 of the present embodiment, B is a magnetic core without a gap, and C is a prototype for comparison. The outer peripheral surface 5 of the magnetic core 1 has a depth of 3 mm and a width of 0.8 mm.
The cut groove 3 is formed.
グラフから明らかなように、Ａの磁心は、磁束密度が
300ガウス以上では、他の磁心に比較して8dB程度騒音が
低減しているとともに、100ガウス以下では磁性密度の
変化に略比例して騒音が低減している。ギャップを形成
していないＢの磁心では100ガウス以下では非直線関係
となり50ガウスでも53dBの騒音が残留した。Ｃのコアで
はＢより騒音が大きくなる。As is clear from the graph, the magnetic core of A has a magnetic flux density
Above 300 gauss, the noise is reduced by about 8 dB compared to other magnetic cores, and below 100 gauss, the noise is reduced in proportion to the change in magnetic density. In the magnetic core of B having no gap, a non-linear relationship was obtained at 100 Gauss or less, and 53 dB of noise remained even at 50 Gauss. The C core is louder than the B core.
第７図に示す実験では基本波の騒音特性を示し、前記
したサンプルＣとの比較では最大12dBの騒音低減が見ら
れる（磁束密度4000ガウスにおいて）。The experiment shown in FIG. 7 shows the noise characteristic of the fundamental wave, and a noise reduction of up to 12 dB is observed in comparison with the above-mentioned sample C (at a magnetic flux density of 4000 gauss).
第８図には前記A,Cの各磁心についての第２高調波の
騒音レベルを示し、磁束密度300ガウスから4000ガウス
において平均7dBの騒音低減が見られた。FIG. 8 shows the noise level of the second harmonic for each of the A and C magnetic cores, and an average noise reduction of 7 dB was observed at a magnetic flux density of 300 gauss to 4000 gauss.
〈第２実施例〉 第２実施例を第２図により説明する。前記第１実施例
では磁心１の第１の側面に切込み溝３を形成したもので
あるが、この例では切込み溝３を磁心１の第１の側面２
と第２の側面４とに対向的に計４箇所形成したものであ
る。<Second Embodiment> A second embodiment will be described with reference to FIG. In the first embodiment, the cut groove 3 is formed on the first side surface of the magnetic core 1. In this example, the cut groove 3 is formed on the first side surface 2 of the magnetic core 1.
And a total of four places are formed on the second side surface 4 so as to face each other.
切込み溝３の深さｈは3mm、幅ｔは0.8mmである。 The cut groove 3 has a depth h of 3 mm and a width t of 0.8 mm.
この磁心１で前記第１実施例と同様な実験を行ったと
ころ同等の騒音低減効果を呈した。When an experiment similar to that of the first embodiment was conducted with this magnetic core 1, the same noise reduction effect was exhibited.
〈第３実施例〉 第３実施例は第３図に示すように、一方の切込み溝３
を磁心１の第１の側面２に、他方の切込み溝３を磁心１
の第２の側面４に夫々形成した。したがってこの例では
２つの両切込み溝３を対向的にしかも非対称に計２箇所
形成したものである。<Third Embodiment> In the third embodiment, as shown in FIG.
On the first side face 2 of the magnetic core 1 and the other notch 3 on the magnetic core 1
Were formed on the second side surface 4 of each. Therefore, in this example, two two notch grooves 3 are formed oppositely and asymmetrically at a total of two places.
切込み溝３の深さｈは6mm、幅ｔは0.8mmである。 The cut groove 3 has a depth h of 6 mm and a width t of 0.8 mm.
〈第４実施例〉 第４実施例は第４図に示すように、切込み溝３を磁心
１の内周面から外周面５方向に対向的に計４箇所形成し
たものである。<Fourth Embodiment> In the fourth embodiment, as shown in FIG. 4, a total of four cut grooves 3 are formed facing each other from the inner peripheral surface of the magnetic core 1 toward the outer peripheral surface 5 thereof.
切込み溝３の深さ１は2mm、幅ｔは0.8mmである。 The depth 1 of the cut groove 3 is 2 mm and the width t is 0.8 mm.
〈第５実施例〉 第５実施例は第５図に示すように、切込み溝３を磁心
１の内周面６から外周面５方向に対向的に計４箇所形成
するとともに、この切込み溝３に連結して磁心１の第１
の側面２にも切込み溝３を形成したものである。<Fifth Embodiment> In the fifth embodiment, as shown in FIG. 5, notched grooves 3 are formed at a total of four positions facing the outer peripheral surface 5 from the inner peripheral surface 6 of the magnetic core 1, and the notched groove 3 is formed. The first of the magnetic core 1 connected to
A cut groove 3 is also formed on the side surface 2 of the.
切込み溝３の深さｈは4mm、幅ｔは0.8mmである。 The cut groove 3 has a depth h of 4 mm and a width t of 0.8 mm.
各実施例とも騒音低減効果が認められた。そして、以
上述べたように、切込み溝３は側面または内周面に異種
同士合わせてまたは同種のものをそれぞれ計２箇所以上
形成することを要し、比較対象として試作した。磁心１
の外周面５に１箇所だけ切込み溝を形成したものでは、
切込み溝３を形成しないものより騒音特性が悪化するこ
とが確認された。A noise reduction effect was recognized in each of the examples. Then, as described above, the cut groove 3 needs to be formed on the side surface or the inner peripheral surface of different kinds or the same kind at a total of two or more places, and was manufactured as a comparison target. Magnetic core 1
With only one cut groove formed on the outer peripheral surface 5 of
It was confirmed that the noise characteristics were worse than those in which the cut groove 3 was not formed.
本考案によれば、前記構成としたので、磁心の振動に
基づく騒音を低減できる。According to the present invention, because of the above configuration, noise due to vibration of the magnetic core can be reduced.
第１図ないし第８図は本考案の実施例を示し、第１図は
第１実施例の斜視図、第２図は第２実施例の斜視図、第
３図は第３実施例の斜視図、第４図は第４実施例の斜視
図、第５図は第５実施例の斜視図、第６図は多重正弦波
（周波数範囲１〜20KHzで出力電圧が一定）で励振した
ときの周波数10KHzにおける磁束密度と騒音の音圧レベ
ルとの関係を示すグラフ、第７図は励振周波数5KHzで正
弦波励振した場合の磁束密度と周波数5KHzの発生音レベ
ルとの関係を示すグラフ、第８図は励振周波数5KHzで正
弦波励振した場合の密度と周波数10khz発生音レベルと
の関係を示すグラフである。 １……磁心、２……第１の側面、３……切込み溝、４…
…第２の側面、５……外周面、６……内周面。1 to 8 show an embodiment of the present invention, FIG. 1 is a perspective view of the first embodiment, FIG. 2 is a perspective view of the second embodiment, and FIG. 3 is a perspective view of the third embodiment. Fig. 4, Fig. 4 is a perspective view of the fourth embodiment, Fig. 5 is a perspective view of the fifth embodiment, and Fig. 6 is a multi-sine wave (the output voltage is constant in the frequency range of 1 to 20 KHz) when excited. A graph showing the relationship between the magnetic flux density at a frequency of 10 KHz and the sound pressure level of noise. Fig. 7 is a graph showing the relationship between the magnetic flux density when a sine wave is excited at an excitation frequency of 5 KHz and the sound level generated at a frequency of 5 KHz. The figure is a graph showing the relationship between the density and the generated sound level of frequency 10khz when a sine wave is excited at an excitation frequency of 5KHz. 1 ... Magnetic core, 2 ... First side surface, 3 ... Notch groove, 4 ...
... second side surface, 5 ... outer peripheral surface, 6 ... inner peripheral surface.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−144113（ＪＰ，Ａ) 特開 昭59−198708（ＪＰ，Ａ) 実開 昭50−104118（ＪＰ，Ｕ) 特公 昭43−15441（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-144113 (JP, A) JP-A-59-198708 (JP, A) Actually developed Shou-50-104118 (JP, U) JP-B 43- 15441 (JP, B1)
Claims (4)
面とを有し、これら外周面と内周面の夫々の一方の縁同
士を連結する第１の側面と、前記外周面と前記内周面と
の夫々の他方の縁同士を連結する第２の側面とを有し、
前記第１の側面又は前記第２の側面のいずれか一方の前
記側面にのみ切込み溝が計２箇所以上形成されているこ
とを特徴とする磁心。1. A first side surface which is annular and has a rectangular cross section, has an outer peripheral surface and an inner peripheral surface, and connects one edge of each of the outer peripheral surface and the inner peripheral surface, and the outer peripheral surface. And a second side surface connecting the other edges of the inner peripheral surface with each other,
A magnetic core having a total of two or more cut grooves formed on only one of the first side surface and the second side surface.
面とを有し、これら外周面と内周面の夫々の一方の縁同
士を連結する第１の側面と、前記外周面と前記内周面と
の夫々の他方の縁同士を連結する第２の側面とを有し、
前記第１の側面から第２の側面に向けて侵入する切込み
溝と前記第２の側面から第１の側面に向けて侵入する切
込み溝とをそれぞれ対向させて計２箇所以上形成したこ
とを特徴とする磁心。2. A first side surface which is annular and has a rectangular cross section, has an outer peripheral surface and an inner peripheral surface, and connects one edge of each of the outer peripheral surface and the inner peripheral surface, and the outer peripheral surface. And a second side surface connecting the other edges of the inner peripheral surface with each other,
It is characterized in that a notch groove penetrating from the first side surface toward the second side surface and a notch groove penetrating from the second side surface toward the first side surface are opposed to each other and are formed at two or more positions in total. And magnetic core.
面とを有し、これら外周面と内周面の夫々の一方の縁同
士を連結する第１の側面と、外周面と内周面との夫々の
他方の縁同士を連結する第２の側面とを有し、前記内周
面から前記外周面に向けて侵入し又は前記外周面から前
記内周面に向けて侵入する切込み溝が計２箇所以上形成
されていることを特徴とする磁心。3. A first side surface, which is annular and has a rectangular cross section, has an outer peripheral surface and an inner peripheral surface, and connects one edge of each of the outer peripheral surface and the inner peripheral surface, and the outer peripheral surface. An inner peripheral surface and a second side surface that connects the other edges of the inner peripheral surface with each other, and intrudes from the inner peripheral surface toward the outer peripheral surface or enters from the outer peripheral surface toward the inner peripheral surface. A magnetic core having a total of two or more cut grooves formed therein.
心。4. The magnetic core according to claim 1, 2 or 3, wherein the area of the cut groove is 40% to 75% of the entire cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990102580U JPH08734Y2 (en) | 1990-09-28 | 1990-09-28 | Magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990102580U JPH08734Y2 (en) | 1990-09-28 | 1990-09-28 | Magnetic core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0459923U JPH0459923U (en) | 1992-05-22 |
| JPH08734Y2 true JPH08734Y2 (en) | 1996-01-10 |
Family
ID=31846954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990102580U Expired - Lifetime JPH08734Y2 (en) | 1990-09-28 | 1990-09-28 | Magnetic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08734Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210350968A1 (en) * | 2018-10-19 | 2021-11-11 | Autonetworks Technologies, Ltd. | Reactor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007189157A (en) * | 2006-01-16 | 2007-07-26 | Sanyo Denki Kogyo Kk | Ac component extractor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50104118U (en) * | 1974-01-30 | 1975-08-27 | ||
| JPS59144113A (en) * | 1983-02-07 | 1984-08-18 | Hitachi Metals Ltd | Magnetic core |
-
1990
- 1990-09-28 JP JP1990102580U patent/JPH08734Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210350968A1 (en) * | 2018-10-19 | 2021-11-11 | Autonetworks Technologies, Ltd. | Reactor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0459923U (en) | 1992-05-22 |
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