JP2002141213A - Dust core - Google Patents
Dust coreInfo
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- JP2002141213A JP2002141213A JP2001134466A JP2001134466A JP2002141213A JP 2002141213 A JP2002141213 A JP 2002141213A JP 2001134466 A JP2001134466 A JP 2001134466A JP 2001134466 A JP2001134466 A JP 2001134466A JP 2002141213 A JP2002141213 A JP 2002141213A
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- Prior art keywords
- dust core
- magnetic
- powder
- permeability
- magnetic field
- Prior art date
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- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は圧粉磁心に関し、更
に詳しくは、初透磁率を低くすることにより、高磁界を
印加しても高い透磁率を示し、結果として優れた直流重
畳特性を発揮するように設計された圧粉磁心に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder magnetic core, and more particularly, to a powder magnetic core having a low initial magnetic permeability, thereby exhibiting a high magnetic permeability even when a high magnetic field is applied, and consequently exhibiting excellent direct current superposition characteristics. To a dust core designed to be.
【０００２】[0002]
【従来の技術】圧粉磁心は、対象製品が小型・複雑な形
状であっても高い歩留まりで製造することができるの
で、従来の磁心の主流であるケイ素鋼板を用いた積層型
磁心に取って代わって広く用いられはじめている。この
圧粉磁心は、一般に、次のようにして製造されている。2. Description of the Related Art A dust core can be manufactured with a high yield even if the target product is small and has a complicated shape. It is beginning to be widely used instead. This dust core is generally manufactured as follows.
【０００３】すなわちまず、所定組成の軟磁性合金に対
して機械粉砕やアトマイズ法を適用して所定の粒度分布
を有する粉末（軟磁性粉末）を製造する。ついで、この
軟磁性粉末に、所定量の絶縁材料とバインダ成分を均一
に混合して、製造目的の圧粉磁心の電気抵抗率を高くす
るための処置が施される。このときに用いる絶縁材料と
しては例えばＡｌ2Ｏ3粉末，ＳｉＯ2粉末などの酸化物
粉末や、ＡｌＮ，Ｓｉ3Ｎ4，ＢＮのような窒化物粉末が
用いられ、またバインダ成分としては電気絶縁性も備え
ている水ガラスや、シリコーン樹脂などの有機高分子が
用いられている。[0003] First, a powder (soft magnetic powder) having a predetermined particle size distribution is manufactured by applying mechanical pulverization or an atomizing method to a soft magnetic alloy having a predetermined composition. Next, a predetermined amount of an insulating material and a binder component are uniformly mixed with the soft magnetic powder, and a treatment is performed to increase the electrical resistivity of the dust core to be manufactured. The insulating material used at this time is, for example, an oxide powder such as Al 2 O 3 powder or SiO 2 powder, or a nitride powder such as AlN, Si 3 N 4 or BN. Organic glass such as water glass and silicone resin, which also has properties, is used.
【０００４】なお、以後の説明においては、上記した絶
縁材料とバインダ成分を一括して「絶縁バインダ」と呼
ぶ。ついで、この混合物を金型に充填したのち所定の圧
力で成形して圧粉磁心のグリーン体が製造される。なお
このとき、成形性を高めるために、通常は、上記した混
合物に更にステアリン酸亜鉛のような潤滑剤の所定量が
混合される。[0004] In the following description, the above-mentioned insulating material and binder component are collectively referred to as "insulating binder". Next, the mixture is filled in a mold and molded at a predetermined pressure to produce a green body of a dust core. At this time, in order to enhance the moldability, a predetermined amount of a lubricant such as zinc stearate is usually further mixed with the above mixture.
【０００５】そして最後に、上記グリーン体に熱処理を
行って、成形時に蓄積された成形歪みを解放し、目的と
する圧粉磁心にする。ところで、このようにして製造さ
れた圧粉磁心は、一般に、直流磁界（印加磁界）が強く
なるにつれて磁束密度が次第に高くなっていき、そして
ある強さの印加磁界で磁束密度が飽和に達するという磁
化曲線（Ｂ−Ｈ曲線）を描く。そして、磁束密度が高く
なっていく過程において、ある直流磁界に交流微小磁界
を重畳して磁界を微小変化させたときの磁束密度の変化
量を前記磁界の微小変化量で除算した値をもって、その
磁界における透磁率（微分比透磁率）が定義されてい
る。したがって、Ｂ−Ｈ曲線の傾きが小さくなる、すな
わち印加磁界が強くなるにつれて、上記微分比透磁率は
小さくなるので透磁率は低くなり、飽和磁化に達した以
降では、透磁率は事実上１となる。[0005] Finally, the green body is subjected to a heat treatment to release the molding strain accumulated at the time of molding to obtain a target dust core. By the way, in the dust core manufactured in this way, generally, the magnetic flux density gradually increases as the DC magnetic field (applied magnetic field) increases, and the magnetic flux density reaches saturation with an applied magnetic field of a certain strength. Draw a magnetization curve (BH curve). Then, in the process of increasing the magnetic flux density, a value obtained by dividing the change amount of the magnetic flux density when the magnetic field is minutely changed by superimposing an AC minute magnetic field on a certain DC magnetic field by the minute change amount of the magnetic field is obtained. The magnetic permeability in a magnetic field (differential relative magnetic permeability) is defined. Therefore, as the gradient of the BH curve becomes smaller, that is, as the applied magnetic field becomes stronger, the above-mentioned differential relative permeability becomes smaller, so that the permeability becomes lower. After reaching the saturation magnetization, the permeability becomes substantially 1 Become.
【０００６】[0006]
【発明が解決しようとする課題】ところで、原料として
センダスト粉末のような軟磁性粉末を用いて製造した高
透磁率の圧粉磁心の場合、大電流通電の状態で使用する
と、強い直流磁界が印加されることになるため、当該圧
粉磁心の磁束密度は急速に飽和に近づき、その結果、透
磁率は１に向かって低下するという問題が発生する。す
なわち、このような高透磁率の圧粉磁心は、直流重畳特
性が悪い。By the way, in the case of a dust core having a high magnetic permeability manufactured using a soft magnetic powder such as sendust powder as a raw material, a strong DC magnetic field is applied when used in a state where a large current is applied. Therefore, the magnetic flux density of the dust core rapidly approaches saturation, and as a result, a problem occurs that the magnetic permeability decreases toward 1. That is, such a dust core having a high magnetic permeability has poor direct current superposition characteristics.
【０００７】通常、各種の用途分野では、初透磁率が６
０〜１２５程度の圧粉磁心が実用されているが、このよ
うな圧粉磁心の場合、例えば１６kA／ｍ以上の高磁界が
印加されると、その透磁率は極めて低くなり、実使用に
耐え得ないという問題が発生している。したがって、例
えば１６kA／ｍ以上の高磁界が印加された場合であって
も、必要水準の透磁率を確保せしめて直流重畳特性の劣
化を抑制するためには、対象とする圧粉磁心の初透磁率
を低めることが効果的である。[0007] Usually, in various application fields, the initial permeability is 6
A dust core of about 0 to 125 is practically used. However, in the case of such a dust core, when a high magnetic field of, for example, 16 kA / m or more is applied, its magnetic permeability becomes extremely low, and the powder core can withstand practical use. There is a problem that it cannot be obtained. Therefore, even when a high magnetic field of, for example, 16 kA / m or more is applied, in order to secure the required level of magnetic permeability and suppress the deterioration of the DC superposition characteristics, the initial permeability of the target powder magnetic core is required. It is effective to lower the magnetic susceptibility.
【０００８】そして、一般に、透磁率は圧粉磁心の密度
の関数であることが知られている。すなわち、低密度の
圧粉磁心は低い透磁率を示すということを考えると、圧
粉磁心の初透磁率を低めるという上記した課題を解決す
るためには、圧粉磁心を低密度化することが効果的であ
るといえる。その場合に考慮すべきことは、その圧粉磁
心は、印加磁界が強くなっていくにつれて磁束密度は高
まり、最終的には飽和磁化にまで到達するという磁気特
性を備えていることであり、また、仮に初透磁率は低く
ても、その圧粉磁心の飽和磁束密度は実使用上の必要水
準を満たしていなければならないということであり、更
には、工業的に高い歩留まりでの製造が可能であるとい
う観点である。It is generally known that the magnetic permeability is a function of the density of the dust core. That is, considering that a low-density dust core shows a low magnetic permeability, in order to solve the above-mentioned problem of lowering the initial permeability of the dust core, it is necessary to reduce the density of the dust core. It can be said that it is effective. In this case, it should be taken into consideration that the dust core has a magnetic property that the magnetic flux density increases as the applied magnetic field increases, and finally reaches the saturation magnetization. Even if the initial magnetic permeability is low, the saturation magnetic flux density of the dust core must meet the required level for practical use, and furthermore, it can be manufactured at a high industrial yield. It is a point of view.
【０００９】本発明は、上記した観点に立って開発され
た圧粉磁心であって、高磁界が印加されても透磁率の低
下が起こりにくく、高い印加磁界に至るまで実使用が可
能である新規な圧粉磁心の提供を目的とする。The present invention is a powder magnetic core developed from the above-mentioned viewpoint, and it is unlikely that the magnetic permeability is reduced even when a high magnetic field is applied, and can be used in practice even up to a high applied magnetic field. The purpose is to provide a new dust core.
【００１０】[0010]
【課題を解決するための手段】上記した目的を達成する
ために、本発明においては、Ｆｅ基である軟磁性粉末を
主体として成る圧粉磁心において、初透磁率をμ0，印
加磁界が２４kA／ｍのときの透磁率をμとしたとき、μ
0，μの間には、μ／μ0≧０.５の関係が成立している
ことを特徴とする圧粉磁心、とくに、アスペクト比が１
〜１.５である軟磁性粉末：６０〜７５体積％と、残部
が絶縁バインダを主体とする成分とから成り、前記絶縁
バインダの含有量が前記軟磁性粉末１００重量部に対し
５〜２０重量部である圧粉磁心が提供される。In order to achieve the above-mentioned object, the present invention provides a powder magnetic core mainly composed of a soft magnetic powder which is Fe-based, having an initial magnetic permeability of μ 0 and an applied magnetic field of 24 kA. When the magnetic permeability at the time of / m is μ, μ
0 and μ, a dust core characterized in that a relationship of μ / μ 0 ≧ 0.5 is established, in particular, an aspect ratio of 1
Soft magnetic powder having a content of 1.5 to 1.5: 60 to 75% by volume, with the balance being a component mainly composed of an insulating binder, wherein the content of the insulating binder is 5 to 20 parts by weight based on 100 parts by weight of the soft magnetic powder. A dust core is provided.
【００１１】[0011]
【発明の実施の形態】本発明の圧粉磁心は、後述する形
状特性を有する軟磁性粉末と、同じく後述する絶縁バイ
ンダとを成形し、更に熱処理して製造され、ある密度を
有するバルク体である。したがって、この圧粉磁心は、
軟磁性粉末が絶縁バインダで被覆され、同時に前記絶縁
バインダによって相互に結着された骨格構造を有し、そ
して内部には微細な孔が分布する組織構造になってい
る。BEST MODE FOR CARRYING OUT THE INVENTION The dust core of the present invention is manufactured by molding a soft magnetic powder having the shape characteristics described later and an insulating binder also described later, and then performing a heat treatment to obtain a bulk body having a certain density. is there. Therefore, this dust core
The soft magnetic powder is covered with an insulating binder, has a skeletal structure mutually bound by the insulating binder, and has a structure in which fine pores are distributed inside.
【００１２】そして、本発明の圧粉磁心では、上記した
組織構造において、軟磁性粉末が占有する体積割合は６
０〜７５体積％の範囲に設定されている。したがって、
残部の成分である絶縁バインダを主体とする成分と、前
記微細孔の全体体積を合量した体積の割合は、２５〜４
０体積％になっている。まず、本発明の圧粉磁心は、そ
の初透磁率をμ0，印加磁界が２４kA／ｍのときの透磁
率をμとしたとき、μ0とμの間には、μ／μ0≧０.５
の関係が成立するような磁気特性を有している。In the dust core of the present invention, the volume ratio occupied by the soft magnetic powder in the above-mentioned structure is 6%.
It is set in the range of 0 to 75% by volume. Therefore,
The proportion of the remaining component, mainly composed of an insulating binder, to the total volume of the micropores is 25 to 4
0% by volume. First, in the dust core of the present invention, when the initial magnetic permeability is μ 0 and the magnetic permeability when the applied magnetic field is 24 kA / m is μ, μ / μ 0 ≧ 0 between μ 0 and μ. .5
Has the magnetic characteristics such that the following relationship holds.
【００１３】すなわち、初透磁率は低いけれども、高磁
界が印加されても、透磁率の低下は少なく、具体的に
は、２４kA／ｍという高磁界が印加されても、その時点
において、初透磁率（μ0）に対して５０％以上の透磁
率（μ）が確保されている圧粉磁心である。このような
磁気特性は、後述する要件を充足せしめることによって
実現することができる。That is, although the initial magnetic permeability is low, even when a high magnetic field is applied, the decrease in the magnetic permeability is small. Specifically, even when a high magnetic field of 24 kA / m is applied, the initial magnetic permeability at that time is low. The dust core has a magnetic permeability (μ) of 50% or more with respect to the magnetic permeability (μ 0 ). Such magnetic characteristics can be realized by satisfying the requirements described later.
【００１４】その場合、軟磁性粉末としては、後述する
アスペクト比が１〜１.５の範囲にあるものを用いるこ
とが好適である。このアスペクト比が１.５より大きい
軟磁性粉末である場合には、当該粉末の反磁界係数が小
さくなるため、製造した圧粉磁心の初透磁率（μ0）は
高くなり、その結果、高磁界印加時の透磁率低下が引き
起こされ、具体的には、μ／μ0≧０.５の関係を成立さ
せることができなくなるからである。In this case, it is preferable to use a soft magnetic powder having an aspect ratio described later in the range of 1 to 1.5. When the soft magnetic powder has an aspect ratio larger than 1.5, the demagnetizing coefficient of the powder becomes small, so that the initial magnetic permeability (μ 0 ) of the manufactured dust core becomes high. This is because a decrease in magnetic permeability when a magnetic field is applied is caused, and specifically, the relationship of μ / μ 0 ≧ 0.5 cannot be established.
【００１５】なお、本発明でいうアスペクト比とは、次
のようにして測定された値のことをいう。 アスペクト比＝Ｌ2／Ｌ1 ここに、Ｌ1は、図１に示すように粉末Ｐから観察され
る長軸長さと定義し、Ｌ2は、Ｌ1の中点を通り、長軸Ｌ
1に垂直な線が粉末の外周を横切って得られる短軸長さ
と定義する。Incidentally, the aspect ratio in the present invention means a value measured as follows. Aspect ratio = L 2 / L 1 Here, L 1 is defined as the major axis length observed from the powder P as shown in FIG. 1, and L 2 passes through the midpoint of L 1 and the major axis L
The line perpendicular to 1 is defined as the minor axis length obtained across the periphery of the powder.
【００１６】したがって、このアスペクト比が１の粉末
とは、それが球であることを意味しており、またアスペ
クト比が１より小さい値として計算されることはない。
なお、本発明で用いる軟磁性粉末としてはＦｅ基軟磁性
合金の粉末で、しかも、上記した形状特性を備えている
粉末であれば何であってもよいが、その場合のＦｅ基軟
磁性合金としては、例えば、Ｆｅ−３％Ｓｉ、Ｆｅ−
６．５％Ｓｉ、Ｆｅ−９．５％Ｓｉ−５．５％Ａｌ（セ
ンダスト）、Ｆｅ−４７％Ｎｉ、Ｆｅ−（１〜１８）％
Ｃｒ合金（％表示はいずれも質量％）などをあげること
ができる。Therefore, the powder having an aspect ratio of 1 means that the powder is a sphere, and is not calculated as a value having an aspect ratio smaller than 1.
The soft magnetic powder used in the present invention is a powder of an Fe-based soft magnetic alloy, and any powder having the above-mentioned shape characteristics may be used. Is, for example, Fe-3% Si, Fe-
6.5% Si, Fe-9.5% Si-5.5% Al (Sendust), Fe-47% Ni, Fe- (1-18)%
Examples thereof include a Cr alloy (% is expressed by mass%).
【００１７】本発明の圧粉磁心において、このような形
状特性を有する粉末の占有率は、６０〜７５体積％の範
囲内に規制されている。上記した占有率が７５体積％よ
り大きい場合には、圧粉磁心の初透磁率（μ0）は高く
なり、その結果、高磁界の印加時の透磁率（μ）は低下
する。具体的には、μ／μ0≧０.５の関係を成立させる
ことができなくなる。In the dust core of the present invention, the occupation ratio of the powder having such a shape characteristic is regulated within a range of 60 to 75% by volume. When the occupancy is greater than 75% by volume, the initial permeability (μ 0 ) of the dust core increases, and as a result, the permeability (μ) when a high magnetic field is applied decreases. Specifically, the relationship of μ / μ 0 ≧ 0.5 cannot be established.
【００１８】また、この占有率が６０体積％より小さい
場合には、後述する絶縁バインダなどの成分の相対的な
割合が多くなっており、同時に微細孔の全体体積も多く
なっている状態であるため、磁気特性の面では、初透磁
率や飽和磁束密度などが低下し、直流重畳特性も劣化
し、そのため、高磁界印加時の透磁率（μ）は低下す
る。具体的には、μ／μ0≧０.５の関係を成立させるこ
とができなくなる。同時に、圧粉磁心は全体として相対
的に多孔質になっているので、充分な強度特性が確保さ
れているとはいいがたい。When the occupancy is less than 60% by volume, the relative proportions of components such as an insulating binder, which will be described later, are large, and the total volume of the fine holes is also large. Therefore, in terms of magnetic characteristics, the initial magnetic permeability, the saturation magnetic flux density, and the like decrease, and the DC superimposition characteristics also deteriorate. Therefore, the magnetic permeability (μ) when a high magnetic field is applied decreases. Specifically, the relationship of μ / μ 0 ≧ 0.5 cannot be established. At the same time, since the dust core is relatively porous as a whole, it cannot be said that sufficient strength characteristics are secured.
【００１９】次に、絶縁バインダなどに関していえば、
本発明で使用可能な絶縁バインダとしては格別限定され
るものではなく、例えば、水ガラスやシリコーン樹脂，
リン酸，フェノール樹脂，イミド樹脂のように従来から
使用されているものを用いればよい。しかしながら、そ
の含有量は、上記した軟磁性粉末１００重量部に対し５
〜２０重量部という従来の圧粉磁心の場合に比べて非常
に大量に設定されていることが好ましい。Next, regarding the insulating binder and the like,
The insulating binder that can be used in the present invention is not particularly limited, for example, water glass, silicone resin,
Conventionally used resins such as phosphoric acid, phenolic resin and imide resin may be used. However, its content is 5 parts per 100 parts by weight of the above soft magnetic powder.
It is preferable that the amount is set to be much larger than that in the case of the conventional dust core of about 20 parts by weight.
【００２０】このように大量に絶縁バインダを含有せし
めることにより、本発明の圧粉磁心は低密度になり、そ
の結果、初透磁率（μ0）が小さい値になってくるので
ある。この含有量が５重量部より少ない場合には、圧粉
磁心の低密度化が不充分となってその初透磁率（μ0）
は大きくなり、そのため、高磁界印加時の透磁率（μ）
が低下する。具体的には、μ／μ0≧０.５の関係を成立
せしめることができなくなる。By including the insulating binder in such a large amount, the dust core of the present invention has a low density, and as a result, the initial magnetic permeability (μ 0 ) becomes a small value. If the content is less than 5 parts by weight, the density of the dust core is insufficiently reduced, and its initial permeability (μ 0 )
Becomes large, and therefore, the magnetic permeability (μ) when a high magnetic field is applied
Decrease. Specifically, the relationship of μ / μ 0 ≧ 0.5 cannot be established.
【００２１】また、２０重量部よりも多くすると、圧粉
磁心としての低密度化は可能になって初透磁率（μ0）
を小さくすることはできるが、他方では、軟磁性粉末の
占有割合が少なくなることに基因して、例えば目的とす
る飽和磁束密度が得にくくなり、また成形時に割れなど
の現象が起こって不良品の発生率が高くなる。本発明の
圧粉磁心は、従来と同じように、上記した各成分を混合
し、その混合物を成形し、ついで熱処理を行って製造す
ることができる。When the amount is more than 20 parts by weight, it is possible to reduce the density of the dust core, and the initial magnetic permeability (μ 0 )
On the other hand, on the other hand, due to the reduced occupation ratio of the soft magnetic powder, for example, it becomes difficult to obtain the desired saturation magnetic flux density, Is increased. The powder magnetic core of the present invention can be manufactured by mixing the above-described components, molding the mixture, and then performing heat treatment, as in the related art.
【００２２】[0022]
【実施例】実施例１〜１０，比較例１〜６ ガスと水を用いるアトマイズ法により、Ｆｅ−９.５％
Ｓｉ−５.５％Ａｌ（センダスト合金組成）で、粒度１
００メッシュ下の軟磁性粉末を製造した。このとき、ア
トマイズ法の運転条件を変えて、表１で示したようなア
スペクト比の粉末にした。EXAMPLES Examples 1 to 10 and Comparative Examples 1 to 6 Fe-9.5% by atomization using gas and water.
Si-5.5% Al (Sendust alloy composition), particle size 1
A soft magnetic powder under 00 mesh was produced. At this time, the operating conditions of the atomizing method were changed to powder having an aspect ratio as shown in Table 1.
【００２３】ついで、これら粉末１００重量部に対し、
表１で示した割合（重量部）の水ガラスを混合し、さら
に０.５重量部のステアリン酸亜鉛（潤滑剤）を混合し
た。この混合物を０.４９〜１.９６×１０3ＭＰａの圧
力でプレス成形して、外径２８mm，内径２０mm，高さ５
mmのリング形状の圧粉体を成形し、ついで、真空中にお
いて温度８００℃で１時間の熱処理を行って圧粉磁心に
した。Next, for 100 parts by weight of these powders,
Water glass in the ratio (parts by weight) shown in Table 1 was mixed, and 0.5 part by weight of zinc stearate (lubricant) was further mixed. This mixture was press-molded at a pressure of 0.49 to 1.96 × 10 3 MPa to obtain an outer diameter of 28 mm, an inner diameter of 20 mm, and a height of 5 mm.
A green compact having a ring shape of mm was formed, and then heat-treated at a temperature of 800 ° C. for 1 hour in a vacuum to obtain a dust core.
【００２４】得られた圧粉磁心の嵩密度を測定したの
ち、１次側４０ターン、２次側２０ターンの巻線を施
し、下記の仕様で透磁率を測定した。 （１）初透磁率（μ0）：ＹＨＰ社製の４２８４１Ａプ
レシジョンＬＣＲメータを用い、印加磁界４Ａ／ｍ，周
波数２０kHzの交流磁界における微分比透磁率として測
定。After measuring the bulk density of the obtained dust core, winding was performed for 40 turns on the primary side and 20 turns on the secondary side, and the magnetic permeability was measured according to the following specifications. (1) Initial permeability (μ 0 ): Measured as a differential relative permeability in an alternating magnetic field of 4 A / m applied magnetic field and a frequency of 20 kHz using a Y2841A Precision LCR meter.
【００２５】（２）印加磁界２４kA／ｍでの透磁率
（μ）：ＹＨＰ社製の４２８４１ＡプレシジョンＬＣＲ
メータを用い、１次側３００ターンの巻線を行い、印加
磁界２４kA／ｍのバイアス直流磁界に印加磁界４Ａ／
ｍ，周波数２０kHzの交流磁界を重畳したときにおける
微分比透磁率として測定。以上の結果を一括して表１に
示した。(2) Magnetic permeability (μ) at an applied magnetic field of 24 kA / m: 42841A Precision LCR manufactured by YHP
Using a meter, winding was performed for 300 turns on the primary side, and an applied magnetic field of 4 A /
m, measured as the differential relative magnetic permeability when an AC magnetic field having a frequency of 20 kHz is superimposed. The above results are collectively shown in Table 1.
【００２６】[0026]
【表１】 [Table 1]
【００２７】表１から次のことが明らかである。 （１）絶縁バインダの割合が本発明で規定する範囲より
少ない比較例１は、嵩密度が高く、初透磁率が高く、高
磁界印加時における透過率の低下の度合が大きくなって
いる。また、絶縁バインダが本発明で規定する範囲より
多い比較例２の場合は、割れの発生が認められ不良品に
なっていた。このようなことから、絶縁バインダの含有
量は軟磁性粉末１００重量部に対し５〜２０重量部に規
定すべきであることがわかる。The following is clear from Table 1. (1) In Comparative Example 1 in which the proportion of the insulating binder is smaller than the range specified in the present invention, the bulk density is high, the initial magnetic permeability is high, and the degree of decrease in the transmittance when a high magnetic field is applied is large. In the case of Comparative Example 2 in which the amount of the insulating binder was larger than the range specified in the present invention, cracking was recognized and the product was defective. From this, it is understood that the content of the insulating binder should be specified to be 5 to 20 parts by weight based on 100 parts by weight of the soft magnetic powder.
【００２８】（２）実施例７と比較例３を対比して明ら
かなように、他の要件は同じであっても、アスペクト比
が本発明で規定する範囲から外れている比較例３の場合
は、実施例１の場合に比べて、初透磁率が高く、高磁界
印加時の透磁率が低下している。このようなことから、
用いる軟磁性粉末のアスペクト比を１〜１.５の範囲内
に設定すべきであることがわかる。(2) As is apparent from a comparison between Example 7 and Comparative Example 3, in the case of Comparative Example 3 in which the aspect ratio is out of the range specified in the present invention, even if the other requirements are the same. Has a higher initial magnetic permeability and a lower magnetic permeability when a high magnetic field is applied than in the case of Example 1. From such a thing,
It is understood that the aspect ratio of the soft magnetic powder to be used should be set in the range of 1 to 1.5.
【００２９】（３）Ｆｅ−９．５％Ｓｉ−５．５％Ａｌ
粉末の体積割合が本発明で規定する７５体積％より大き
い比較例１，体積割合が本発明で規定する６０体積％よ
り小さい比較例２，比較例５と、体積割合が本発明の規
定範囲内である実施例１とを対比して明らかなように、
比較例１の場合は初透磁率が大きく、高磁界印加時の透
磁率の低下が激しい。また比較例２，比較例５の場合
は、初透磁率は小さいとはいえ、やはり、高磁界印加時
の透磁率は低下している。このようなことから、軟磁性
粉末の体積割合は６０〜７５体積％に規定すべきである
ことがわかる。(3) Fe-9.5% Si-5.5% Al
Comparative Examples 1 and 2 in which the volume ratio of the powder is larger than 75% by volume defined in the present invention, and Comparative Example 2 and Comparative Example 5 in which the volume ratio is smaller than 60% by volume specified in the present invention, and the volume ratio is within the specified range of the present invention. As is clear in comparison with Example 1 which is
In the case of Comparative Example 1, the initial magnetic permeability was large, and the magnetic permeability when applying a high magnetic field was drastically reduced. In Comparative Examples 2 and 5, although the initial magnetic permeability is small, the magnetic permeability when a high magnetic field is applied is still low. From these facts, it is understood that the volume ratio of the soft magnetic powder should be set to 60 to 75% by volume.
【００３０】[0030]
【発明の効果】以上の説明で明らかなように、本発明の
圧粉磁心は、初透磁率は低いけれども、高磁界の印加時
にあっても透磁率の低下が抑制されている。したがっ
て、この圧粉磁心は、大電流用のチョークコイルやイン
ダクターのような用途に使用して有用である。As is apparent from the above description, the dust core of the present invention has a low initial magnetic permeability, but a decrease in the magnetic permeability is suppressed even when a high magnetic field is applied. Therefore, this dust core is useful for use in applications such as chokes and inductors for large currents.
【図１】アスペクト比を算出する長軸Ｌ1，短軸Ｌ2の定
義を説明するための軟磁性粉末の平面図である。FIG. 1 is a plan view of a soft magnetic powder for explaining the definition of a major axis L 1 and a minor axis L 2 for calculating an aspect ratio.
Ｐ 軟磁性粉末 Ｌ1 長軸 Ｌ2 短軸P Soft magnetic powder L 1 Long axis L 2 Short axis
Claims (2)
る圧粉磁心において、初透磁率をμ0，印加磁界が２４k
A／ｍのときの透磁率をμとしたとき、μ0とμの間に
は、μ／μ0≧０.５の関係が成立していることを特徴と
する圧粉磁心。1. A dust core mainly composed of a soft magnetic powder based on Fe, having an initial magnetic permeability of μ 0 and an applied magnetic field of 24 k
A dust core, wherein the relationship of μ / μ 0 ≧ 0.5 is established between μ 0 and μ when the magnetic permeability at A / m is μ.
粉末：６０〜７５体積％と、残部が絶縁バインダを主体
とする成分とから成り、前記絶縁バインダの含有量が前
記粉末１００重量部に対し５〜２０重量部である、請求
項１の圧粉磁心。2. A soft magnetic powder having an aspect ratio of 1 to 1.5: 60 to 75% by volume, the balance being composed mainly of an insulating binder, wherein the content of the insulating binder is 100% by weight of the powder. The dust core according to claim 1, wherein the amount is 5 to 20 parts by weight per part.
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| JP2001134466A JP4487025B2 (en) | 2000-08-25 | 2001-05-01 | Dust core |
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| JP2000255441 | 2000-08-25 | ||
| JP2000-255441 | 2000-08-25 | ||
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009302165A (en) * | 2008-06-11 | 2009-12-24 | Tamura Seisakusho Co Ltd | Dust core and manufacturing method thereof |
| JP2012142601A (en) * | 2012-03-22 | 2012-07-26 | Sumitomo Electric Ind Ltd | Reactor and converter |
| JP2015181208A (en) * | 2015-07-17 | 2015-10-15 | 住友電気工業株式会社 | reactor |
| EP2963659A1 (en) | 2014-06-13 | 2016-01-06 | Toyota Jidosha Kabushiki Kaisha | Soft magnetic member, reactor, powder for dust core, and method of producing dust core |
| JP2016149559A (en) * | 2016-03-03 | 2016-08-18 | 住友電気工業株式会社 | Soft magnetic composite material |
| EP3157019A1 (en) | 2015-10-14 | 2017-04-19 | Toyota Jidosha Kabushiki Kaisha | Compressed powder core, powders for compressed powder core, and method for producing compressed powder core |
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2001
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009302165A (en) * | 2008-06-11 | 2009-12-24 | Tamura Seisakusho Co Ltd | Dust core and manufacturing method thereof |
| JP2012142601A (en) * | 2012-03-22 | 2012-07-26 | Sumitomo Electric Ind Ltd | Reactor and converter |
| EP2963659A1 (en) | 2014-06-13 | 2016-01-06 | Toyota Jidosha Kabushiki Kaisha | Soft magnetic member, reactor, powder for dust core, and method of producing dust core |
| US9941039B2 (en) | 2014-06-13 | 2018-04-10 | Toyota Jidosha Kabushiki Kaisha | Soft magnetic member, reactor, powder for dust core, and method of producing dust core |
| US10497500B2 (en) | 2014-09-08 | 2019-12-03 | Toyota Jidosha Kabuhiki Kaisha | Powder magnetic core, powder for magnetic cores, and methods of manufacturing them |
| JP2015181208A (en) * | 2015-07-17 | 2015-10-15 | 住友電気工業株式会社 | reactor |
| EP3157019A1 (en) | 2015-10-14 | 2017-04-19 | Toyota Jidosha Kabushiki Kaisha | Compressed powder core, powders for compressed powder core, and method for producing compressed powder core |
| US10535454B2 (en) | 2015-10-14 | 2020-01-14 | Toyota Jidosha Kabushiki Kaisha | Compressed powder core, powders for compressed power core, and method for producing compressed powder core |
| JP2016149559A (en) * | 2016-03-03 | 2016-08-18 | 住友電気工業株式会社 | Soft magnetic composite material |
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