JP2013239542A - Reactor - Google Patents

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JP2013239542A
JP2013239542A JP2012111071A JP2012111071A JP2013239542A JP 2013239542 A JP2013239542 A JP 2013239542A JP 2012111071 A JP2012111071 A JP 2012111071A JP 2012111071 A JP2012111071 A JP 2012111071A JP 2013239542 A JP2013239542 A JP 2013239542A
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hollow particles
composite magnetic
magnetic body
coil
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Keisuke Akagi
啓祐 赤木
Takashi Yamaya
孝志 山家
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Tokin Corp
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NEC Tokin Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a reactor suppressed in stress due to thermal expansion at an inside of a composite magnetic body.SOLUTION: A reactor comprises: a coil 2 formed by winding a conductor; and a composite magnetic body 1 containing soft magnetic powder, a binder and hollow particles 11. The coil 2 is buried in the composite magnetic body 1, and each of the hollow particle 11 has a D50 of less than 10 μm. The D50 is a volume-based cumulative 50% particle diameter. Preferably, the D50 of each of the hollow particles is 0.1 μm or more and 5.0 μm or less, and an average of a ratio between the inner diameter and the outer diameter in each of the hollow particles is 0.30 or more and 0.99 or less.

Description

本発明は、インダクタンスを有するリアクトルに関する。   The present invention relates to a reactor having an inductance.

導電体を螺旋状に巻回したコイルと、前記コイルを覆う絶縁皮膜と、絶縁皮膜を覆うように、磁性粉末と有機結合剤とを混合した複合磁性体を配したコイル部品であって、コイルの熱膨張を吸収するために、絶縁皮膜内部に気泡を内包する樹脂の球状粒子を含有されたコイル部品が特許文献１に開示されている。   A coil component in which a coil in which a conductor is spirally wound, an insulating film covering the coil, and a composite magnetic body in which magnetic powder and an organic binder are mixed so as to cover the insulating film are arranged. Patent Document 1 discloses a coil component containing resin spherical particles that enclose air bubbles inside an insulating film in order to absorb the thermal expansion.

また、磁性体粉末と、非磁性体粉末と、樹脂との混成物を硬化させて得られる磁芯に、不活性ガスが内部へ充填された平均粒径５０μｍの略球状シリカ中空粉を含有させることで、コイルや磁芯からの騒音を改善する技術が特許文献２に開示されている。   Also, a substantially spherical silica hollow powder having an average particle diameter of 50 μm and filled with an inert gas is contained in a magnetic core obtained by curing a composite of magnetic powder, nonmagnetic powder, and resin. Thus, Patent Document 2 discloses a technique for improving noise from a coil and a magnetic core.

特開２０１０−２５７９９９号公報JP 2010-257999 A 特開２００６−０２４８４４号公報JP 2006-024844 A

複合磁性体へコイルを埋設したリアクトルでは、通電によりコイルが発熱し、コイル及びコイル周辺の複合磁性体が熱膨張する。また、同時に交流電流通電によりコイル周辺には交流磁界が誘起され、複合磁性体内部にも磁気損失が生じ、発熱する。しかしながら上記特許文献に開示された構成においては、熱膨張による複合磁性体内部応力の上昇と、内部応力による損傷発生の可能性について充分考慮されていないという課題がある。   In a reactor in which a coil is embedded in a composite magnetic body, the coil generates heat when energized, and the coil and the composite magnetic body around the coil are thermally expanded. At the same time, an alternating magnetic field is induced around the coil by the alternating current, and a magnetic loss is generated inside the composite magnetic body to generate heat. However, in the configuration disclosed in the above-mentioned patent document, there is a problem that the increase in the internal stress of the composite magnetic body due to thermal expansion and the possibility of damage due to the internal stress are not sufficiently considered.

従って本発明の目的は、複合磁性体内部の熱膨張による応力を抑えたリアクトルを提供することにある。   Accordingly, an object of the present invention is to provide a reactor in which stress due to thermal expansion inside the composite magnetic body is suppressed.

上記課題を本発明は、導体を巻き回したコイルと、軟磁性粉と結合材と中空粒子を含有する複合磁性体を備え、コイルは複合磁性体に埋設され、中空粒子のＤ５０は１０μｍよりも小さいリアクトルにより解決する。ここで、Ｄ５０とは体積基準の累積度数５０％相当粒径のことである。   To solve the above problems, the present invention includes a coil around which a conductor is wound, a composite magnetic body containing soft magnetic powder, a binder, and hollow particles, the coil is embedded in the composite magnetic body, and the D50 of the hollow particles is more than 10 μm. Solve with a small reactor. Here, D50 is a particle size corresponding to a volume-based cumulative frequency of 50%.

また、中空粒子のＤ５０が０．１μｍ以上、５．０μｍ以下であり、中空粒子における内径と外径の比の平均値が０．３０以上、０．９９以下であってもよい。ここで、中空粒子の内径とは、中空粒子中にある空洞部の直径のことである。また、中空粒子の外径とは、中空粒子の粒径のことである。   The D50 of the hollow particles may be 0.1 μm or more and 5.0 μm or less, and the average value of the ratio of the inner diameter to the outer diameter of the hollow particles may be 0.30 or more and 0.99 or less. Here, the inner diameter of the hollow particles is the diameter of the hollow portion in the hollow particles. The outer diameter of the hollow particles is the particle diameter of the hollow particles.

また、中空粒子のＤ５０が０．３μｍ以上、２．０μｍ以下であり、中空粒子における内径と外径の比の平均値が０．７以上、０．９以下であってもよい。   The D50 of the hollow particles may be 0.3 μm or more and 2.0 μm or less, and the average value of the ratio of the inner diameter to the outer diameter of the hollow particles may be 0.7 or more and 0.9 or less.

また、複合磁性体における中空粒子の体積含有率が０．１％以上、５．０％以下であってもよい。   Further, the volume content of the hollow particles in the composite magnetic body may be 0.1% or more and 5.0% or less.

また、複合磁性体における中空粒子の体積含有率が０．５％以上、２．５％以下であってもよい。   The volume content of the hollow particles in the composite magnetic body may be 0.5% or more and 2.5% or less.

また、コイル表面近傍の複合磁性体内における中空粒子の体積含有率が、コイル表面近傍より一定距離以上離れた領域の複合磁性体内における中空粒子の体積含有率よりも低くてもよい。   In addition, the volume content of the hollow particles in the composite magnetic body in the vicinity of the coil surface may be lower than the volume content of the hollow particles in the composite magnetic body in a region separated by a certain distance or more from the vicinity of the coil surface.

本発明により、複合磁性体内部の熱膨張による応力を抑えたリアクトルを提供することができる。   According to the present invention, it is possible to provide a reactor in which stress due to thermal expansion inside the composite magnetic body is suppressed.

本発明におけるリアクトルの一例を示す斜視図である。It is a perspective view which shows an example of the reactor in this invention. 本発明におけるリアクトルの一例であって、図１におけるＡＡ面の断面図である。It is an example of the reactor in this invention, Comprising: It is sectional drawing of the AA surface in FIG. 本発明におけるリアクトルの一例であって、図２におけるＢ−Ｃ部分の断面拡大図である。It is an example of the reactor in this invention, Comprising: It is a cross-sectional enlarged view of the BC section in FIG. 本発明におけるリアクトルの他の一例であって、図１におけるＡＡ面の断面図である。It is another example of the reactor in this invention, Comprising: It is sectional drawing of the AA surface in FIG.

本発明の実施形態について、図面を用いて説明する。   Embodiments of the present invention will be described with reference to the drawings.

（実施形態１）
本発明は、例えば、導体を巻き回したコイルと、軟磁性粉と結合材と中空粒子を含有する複合磁性体を備え、コイルは複合磁性体に埋設され、中空粒子のＤ５０が１０μｍよりも小さいリアクトルの実施形態を取り得る。 (Embodiment 1)
The present invention includes, for example, a coil wound with a conductor, a composite magnetic body containing soft magnetic powder, a binder, and hollow particles, the coil is embedded in the composite magnetic body, and the D50 of the hollow particles is smaller than 10 μm. Reactor embodiments may be taken.

特許文献２には中空粒子を含有する複合磁性体が記載されている。複合磁性体の熱膨張を吸収して中空粒子が収縮しようとすると、中空粒子の平均粒径が５０μｍ以上と大き過ぎるため、中空粒子の形態が復元しない恐れがある。一方本実施形態では中空粒子のＤ５０が１０μｍよりも小さいため、中空粒子の形態復元性が高く、熱膨張が繰り返し起きても中空粒子による膨張吸収作用を保つことができる。   Patent Document 2 describes a composite magnetic body containing hollow particles. If the hollow particles try to shrink by absorbing the thermal expansion of the composite magnetic body, the average particle diameter of the hollow particles is too large, ie 50 μm or more, so that the shape of the hollow particles may not be restored. On the other hand, in this embodiment, since the D50 of the hollow particles is smaller than 10 μm, the shape restoration property of the hollow particles is high, and the expansion absorption action by the hollow particles can be maintained even if the thermal expansion repeatedly occurs.

図１は、本発明におけるリアクトルの一例を示す斜視図である。   FIG. 1 is a perspective view showing an example of a reactor in the present invention.

本実施形態におけるリアクトルは、複合磁性体１にコイル２が埋設された構成となっている。コイル２を構成する導体の両端は、図示されない端子により通電することができる。   The reactor in this embodiment has a configuration in which a coil 2 is embedded in a composite magnetic body 1. Both ends of the conductor constituting the coil 2 can be energized by terminals not shown.

複合磁性体１にコイル２を埋設させる方法としては、軟磁性粉と、熱硬化型エポキシ樹脂等の未硬化液状樹脂結合材と、後述の中空粒子を主に含有する複合磁性体１を注ぎ込み、さらに型の中へコイル２を入れて複合磁性体１を硬化する方法などが挙げられる。   As a method for embedding the coil 2 in the composite magnetic body 1, the composite magnetic body 1 mainly containing soft magnetic powder, an uncured liquid resin binder such as a thermosetting epoxy resin, and hollow particles described later is poured. Furthermore, the method of putting the coil 2 in the mold and curing the composite magnetic body 1 can be mentioned.

さらに、複合磁性体１を硬化させる前に減圧下に置くことにより、複合磁性体１内部の結合材に含まれた気泡を除くことが望ましい。この場合、結合材は軟磁性粉及び中空粒子等の粒子間にほぼ隙間無く充填される。   Furthermore, it is desirable to remove bubbles contained in the binder inside the composite magnetic body 1 by placing the composite magnetic body 1 under reduced pressure before curing the composite magnetic body 1. In this case, the binder is filled with almost no space between the particles such as the soft magnetic powder and the hollow particles.

図２は、本発明におけるリアクトルの一例であって、図１におけるＡＡ面の断面図である。   FIG. 2 is an example of a reactor in the present invention, and is a cross-sectional view of the AA plane in FIG.

コイル２には絶縁被覆２１が設けられ、複合磁性体１との間を電気的に絶縁している。   The coil 2 is provided with an insulating coating 21 to electrically insulate it from the composite magnetic body 1.

また、複合磁性体１の内部には中空粒子１１が含まれている。   The composite magnetic body 1 contains hollow particles 11.

ここで、中空粒子１１のＤ５０を１０μｍより小さくすることにより、結合材が未硬化の状態で液状の複合磁性体を型に注ぎ込む際の流動性を高めることができる。   Here, by making D50 of the hollow particles 11 smaller than 10 μm, it is possible to improve the fluidity when the liquid composite magnetic material is poured into the mold in a state where the binder is uncured.

特許文献１には平均粒径が１０μｍより小さいと気泡が潰れにくいとの記載がある。   Patent Document 1 describes that bubbles are less likely to collapse when the average particle size is less than 10 μm.

しかし本実施形態では、型に注ぎ込む際の流動性が複合磁性体に要求されるため、あえて中空粒子１１のＤ５０を１０μｍより小さくしている。   However, in this embodiment, since the fluidity when pouring into the mold is required for the composite magnetic body, D50 of the hollow particles 11 is intentionally made smaller than 10 μm.

なお、中空粒子１１のＤ５０を０．１μｍ以上、５．０μｍ以下とすることにより、結合材が未硬化の状態で液状の複合磁性体を型に注ぎ込む際の流動性をより高めることができる。   In addition, by setting D50 of the hollow particles 11 to 0.1 μm or more and 5.0 μm or less, it is possible to further improve the fluidity when pouring the liquid composite magnetic material into the mold in a state where the binder is uncured.

図３は、本発明におけるリアクトルの一例であって、図２におけるＢ−Ｃ部分の断面拡大図である。   FIG. 3 is an example of a reactor according to the present invention, and is a cross-sectional enlarged view of a B-C portion in FIG. 2.

本実施形態における複合磁性体１は、結合材１０中に空洞部１１１と外皮部１１２を持つ中空粒子と、軟磁性粉１２と、非磁性粉１３を含有している。   The composite magnetic body 1 in the present embodiment includes hollow particles having a cavity portion 111 and an outer skin portion 112 in a binder 10, soft magnetic powder 12, and nonmagnetic powder 13.

ここで、軟磁性粉１２としては、Ｆｅ−Ｓｉ、Ｆｅ−Ｓｉ−Ｂ、Ｆｅ−Ｓｉ−Ａｌ、Ｆｅ−Ｓｉ−Ｃｒ等の軟磁性金属粉や、フェライト粉砕粉などが挙げられるが、放熱性が重要視される大電流用途では、軟磁性金属粉が好適に用いられる。   Here, examples of the soft magnetic powder 12 include soft magnetic metal powders such as Fe-Si, Fe-Si-B, Fe-Si-Al, and Fe-Si-Cr, and ferrite pulverized powder. For high current applications where importance is attached, soft magnetic metal powder is preferably used.

中空粒子における内径ｄ１と外径ｄ２の比の平均値を０．３０以上、０．９９以下とすることにより、中空粒子が熱膨張を吸収して収縮する際の柔軟性と強度を両立させることができる。   By making the average value of the ratio of the inner diameter d1 and the outer diameter d2 in the hollow particles 0.30 or more and 0.99 or less, both the flexibility and strength when the hollow particles absorb and contract the thermal expansion are achieved. Can do.

ここで、中空粒子の内径ｄ１とは、中空粒子中にある空洞部１１１の直径のことである。また、中空粒子の外径ｄ２とは、中空粒子の外径のことである。中空粒子に複数の空洞部がある場合は、複数空洞部における内径の合計、例えば図３ではｄ１’とｄ１’’の合計を中空粒子の内径とする。   Here, the inner diameter d1 of the hollow particles is the diameter of the cavity 111 in the hollow particles. Moreover, the outer diameter d2 of the hollow particles is the outer diameter of the hollow particles. When the hollow particle has a plurality of cavities, the total inner diameter of the plurality of cavities, for example, the total of d1 ′ and d1 ″ in FIG.

また、中空粒子のＤ５０を２．０μｍ以下、より望ましくは１．５μｍ以下に制限することで複合磁性体の膨張収縮による中空粒子の形態復元性を高めることができる。さらに、中空粒子のＤ５０を０．３μｍ以上、より望ましくは０．５μｍ以上に制限することで中空粒子が熱膨張を吸収して収縮する際の柔軟性を高めることができる。   Further, by limiting the D50 of the hollow particles to 2.0 μm or less, and more desirably 1.5 μm or less, the shape restoration property of the hollow particles due to the expansion and contraction of the composite magnetic material can be enhanced. Furthermore, by limiting the D50 of the hollow particles to 0.3 μm or more, and more desirably 0.5 μm or more, the flexibility when the hollow particles absorb and contract by thermal expansion can be enhanced.

また、中空粒子における内径ｄ１と外径ｄ２の比の平均値を０．７以上とすることにより、中空粒子が熱膨張を吸収して収縮する際の柔軟性をより高めることができる。さらに、中空粒子における内径ｄ１と外径ｄ２の比の平均値を０．９以下とすることにより外皮部１１２の厚さを中空粒子が内包する気体の大気圧による膨張を抑制することができる、すなわち、中空粒子がある程度の硬さを持つため、型に注ぎ込まれた液状の複合磁性体を真空引きにより脱泡する際、中空粒子が必要以上に膨張して液状の複合磁性体が型から溢れ出すのを防ぐことができる。   In addition, by setting the average value of the ratio of the inner diameter d1 and the outer diameter d2 in the hollow particles to 0.7 or more, the flexibility when the hollow particles contract by absorbing thermal expansion can be further increased. Furthermore, by setting the average value of the ratio of the inner diameter d1 and the outer diameter d2 in the hollow particles to 0.9 or less, it is possible to suppress expansion due to the atmospheric pressure of the gas that the hollow particles contain the thickness of the outer skin portion 112. In other words, since the hollow particles have a certain degree of hardness, when the liquid composite magnetic material poured into the mold is degassed by evacuation, the hollow particles expand more than necessary and the liquid composite magnetic material overflows from the mold. Can be prevented.

また、複合磁性体における中空粒子の体積含有率を０．１％以上、５．０％以下とすることにより、中空粒子が熱膨張を充分吸収でき、しかも軟磁性粉の充填率を高めることで磁気特性を高めることができる。   In addition, by setting the volume content of the hollow particles in the composite magnetic body to 0.1% or more and 5.0% or less, the hollow particles can sufficiently absorb thermal expansion, and the filling rate of the soft magnetic powder can be increased. Magnetic characteristics can be enhanced.

さらに、複合磁性体における中空粒子の体積含有率を０．５％以上、２．５％以下とすることにより、複合磁性体の熱伝導率を高めることができる。   Furthermore, the heat conductivity of a composite magnetic body can be raised by making volume content rate of the hollow particle in a composite magnetic body into 0.5% or more and 2.5% or less.

（実施形態２）
また、本発明は、コイル表面近傍の複合磁性体内における中空粒子の体積含有率が、コイル表面近傍より一定距離以上離れた領域の複合磁性体内における中空粒子の体積含有率よりも低いリアクトルの実施形態を取り得る。 (Embodiment 2)
Further, the present invention provides an embodiment of a reactor in which the volume content of the hollow particles in the composite magnetic body near the coil surface is lower than the volume content of the hollow particles in the composite magnetic body in a region separated by a certain distance or more from the vicinity of the coil surface. Can take.

複合磁性体内でも特にコイル近傍へ大きな磁界が印加されるため、リアクトルのインダクタンスを高める上ではコイル表面近傍の軟磁性粉の含有率を多くするのが望ましく、コイル近傍にある複合磁性体からの放熱性を高める上ではコイル近傍の複合磁性体に中空粒子をできるだけ含有させないのが望ましい。   In order to increase the inductance of the reactor, it is desirable to increase the soft magnetic powder content in the vicinity of the coil surface and to release heat from the composite magnetic material in the vicinity of the coil, since a large magnetic field is applied to the vicinity of the coil even in the composite magnetic body. In order to improve the properties, it is desirable that the composite magnetic material in the vicinity of the coil contains as little hollow particles as possible.

この場合、コイル表面より一定距離以上離れた領域の複合磁性体に中空粒子を含有させることで複合磁性体の熱膨張を吸収することができる。   In this case, the thermal expansion of the composite magnetic body can be absorbed by incorporating hollow particles in the composite magnetic body in a region separated from the coil surface by a certain distance or more.

図４は、本発明におけるリアクトルの他の一例であって、図１におけるＡＡ面の断面図である。   FIG. 4 is another example of the reactor in the present invention, and is a cross-sectional view of the AA plane in FIG.

まずコイル２の絶縁被覆２１より一定距離Ｌの範囲に複合磁性体１０１を形成し、一定距離Ｌを超える範囲には、先に形成した複合磁性体１０１よりも中空粒子１１の体積含有率が高い複合磁性体１０２を形成する。   First, the composite magnetic body 101 is formed in the range of a certain distance L from the insulating coating 21 of the coil 2, and the volume content of the hollow particles 11 is higher than the previously formed composite magnetic body 101 in the range exceeding the certain distance L. The composite magnetic body 102 is formed.

このようなリアクトルを作成する方法としては、例えば複合磁性体を２段階に分けて形成する方法が挙げられる。   As a method for creating such a reactor, for example, a method of forming a composite magnetic body in two stages can be mentioned.

すなわち、最初にコイル２の絶縁被覆２１表面へ中空粒子を含有しない複合磁性体１０１を形成し、さらにその外側を覆うように複合磁性体１０２を形成することで図４のリアクトルを作成することができる。   That is, the reactor shown in FIG. 4 can be created by first forming the composite magnetic body 101 containing no hollow particles on the surface of the insulating coating 21 of the coil 2 and further forming the composite magnetic body 102 so as to cover the outside. it can.

なお、コイル２の絶縁被覆２１より一定距離Ｌの範囲にある複合磁性体１０１が中空粒子１１を含有していなくとも良い。   Note that the composite magnetic body 101 in the range of a certain distance L from the insulating coating 21 of the coil 2 may not contain the hollow particles 11.

実施形態１の構成で、厚さ１ｍｍ、幅１０ｍｍの平角導線を３０ターン巻き回したものをコイル２として、コイル２表面に絶縁被覆２１を形成した。   The insulation coating 21 was formed on the surface of the coil 2 using the configuration of the first embodiment as a coil 2 in which a rectangular conductor wire having a thickness of 1 mm and a width of 10 mm was wound for 30 turns.

未硬化の液状エポキシ樹脂からなる結合材１０に、アクリル酸等の不飽和カルボン酸とスチレン等のラジカル重合体モノマーの重合体からなる中空粒子１１、Ｆｅ−Ｓｉ系の軟磁性粉１２、非磁性粉１３を配合した複合磁性体１に絶縁被覆２１を形成したコイル２を埋設し、結合材１０を熱硬化させてリアクトルを作製した。   A binder 10 made of an uncured liquid epoxy resin, hollow particles 11 made of a polymer of an unsaturated carboxylic acid such as acrylic acid and a radical polymer monomer such as styrene, Fe-Si soft magnetic powder 12, non-magnetic The coil 2 in which the insulating coating 21 was formed was embedded in the composite magnetic body 1 in which the powder 13 was blended, and the binder 10 was thermoset to produce a reactor.

なお、中空粒子１１の内径は０．９μｍ、外径は１．１μｍである。また、複合磁性体１における中空粒子１１の体積含有率は１％である。   The hollow particles 11 have an inner diameter of 0.9 μm and an outer diameter of 1.1 μm. Further, the volume content of the hollow particles 11 in the composite magnetic body 1 is 1%.

本実施形態のリアクトルを５台作製し、コイルに２００Ａの直流電流を７０秒通電する試験を行い、コイル周辺の複合磁性体について断面観察を行ったところ、いずれのリアクトルも複合磁性体内部に熱膨張による微小なヒビ等の損傷は認められなかった。   Five reactors of the present embodiment were produced, a test was conducted in which a DC current of 200 A was passed through the coil for 70 seconds, and cross-sectional observation was performed on the composite magnetic body around the coil. All reactors were heated inside the composite magnetic body. No damage such as fine cracks due to expansion was observed.

試験を行うまでは、複合磁性体に中空粒子を含有させることで放熱性が低下し、コイル近傍にある複合磁性体へ熱が篭もることで複合磁性体の熱膨張が促進され、複合磁性体内部でより過剰な応力が発生されることも懸念された。   Until the test is performed, the inclusion of hollow particles in the composite magnetic material reduces the heat dissipation, and heat builds up on the composite magnetic material in the vicinity of the coil, which accelerates the thermal expansion of the composite magnetic material and There was also concern that more stress would be generated inside the body.

しかし本実施例における試験結果より、複合磁性体に含有された中空粒子が放熱性抑制よりも熱膨張を吸収する作用を主に有することが確認された。   However, the test results in this example confirmed that the hollow particles contained in the composite magnetic body mainly have an action of absorbing thermal expansion rather than suppressing heat dissipation.

１、１０１、１０２ 複合磁性体
２ コイル
１０ 結合材
１１ 中空粒子
１２ 軟磁性粉
１３ 非磁性粉
２１ 絶縁被覆
１１１ 空洞部
１１２ 外皮部
ｄ１、ｄ１’、ｄ１’’ 内径
ｄ２ 外径
Ｌ 距離 1, 101, 102 Composite magnetic body 2 Coil 10 Binder 11 Hollow particle 12 Soft magnetic powder 13 Nonmagnetic powder 21 Insulation coating 111 Cavity 112 Outer skin part d1, d1 ', d1''Inner diameter d2 Outer diameter L Distance

Claims (6)

導体を巻き回したコイルと、
軟磁性粉と結合材と中空粒子を含有する複合磁性体を備え、
前記コイルは前記複合磁性体に埋設され、
前記中空粒子のＤ５０は１０μｍよりも小さいことを特徴とするリアクトル。 A coil wound with a conductor;
Comprising a composite magnetic body containing soft magnetic powder, a binder and hollow particles;
The coil is embedded in the composite magnetic body,
The reactor, wherein D50 of the hollow particles is smaller than 10 μm. 前記中空粒子のＤ５０は０．１μｍ以上、５．０μｍ以下であり、
前記中空粒子における内径と外径の比の平均値が０．３０以上、０．９９以下であることを特徴とする請求項１に記載のリアクトル。 D50 of the hollow particles is 0.1 μm or more and 5.0 μm or less,
The reactor according to claim 1, wherein an average value of a ratio of an inner diameter and an outer diameter of the hollow particles is 0.30 or more and 0.99 or less. 前記中空粒子のＤ５０は０．３μｍ以上、２．０μｍ以下であり、
前記中空粒子における内径と外径の比の平均値が０．７以上、０．９以下であることを特徴とする請求項１に記載のリアクトル。 D50 of the hollow particles is 0.3 μm or more and 2.0 μm or less,
The reactor according to claim 1, wherein an average value of a ratio of an inner diameter and an outer diameter of the hollow particles is 0.7 or more and 0.9 or less. 前記複合磁性体における前記中空粒子の体積含有率は０．１％以上、５．０％以下であることを特徴とする請求項１から請求項３のいずれかに記載のリアクトル。   The reactor according to any one of claims 1 to 3, wherein a volume content of the hollow particles in the composite magnetic body is 0.1% or more and 5.0% or less. 前記複合磁性体における前記中空粒子の体積含有率は０．５％以上、２．５％以下であることを特徴とする請求項４に記載のリアクトル。   The reactor according to claim 4, wherein the volume content of the hollow particles in the composite magnetic body is 0.5% or more and 2.5% or less. 前記コイル表面近傍の前記複合磁性体内における前記中空粒子の体積含有率は、
前記コイル表面近傍より一定距離以上離れた領域の前記複合磁性体内における前記中空粒子の体積含有率よりも低いことを特徴とする請求項１から請求項５のいずれかに記載のリアクトル。 The volume content of the hollow particles in the composite magnetic body in the vicinity of the coil surface is:
The reactor according to any one of claims 1 to 5, wherein the reactor has a volume content lower than that of the hollow particles in the composite magnetic body in a region separated by a certain distance or more from the vicinity of the coil surface.
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