JP6548801B1

JP6548801B1 - Reactor cooling structure and power converter

Info

Publication number: JP6548801B1
Application number: JP2018210255A
Authority: JP
Inventors: 真吾 ▲高▼渊
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-11-08
Filing date: 2018-11-08
Publication date: 2019-07-24
Anticipated expiration: 2038-11-08
Also published as: JP2020077763A

Abstract

【課題】リアクトルを小型化すると共に冷却効率の低下を抑制することが可能なリアクトルの冷却構造を得る。【解決手段】コア４１とコイル２１の外周を覆う収納部５と、収納部に固定される冷却器７とを備え、収納部５は、コア及びコイルの上方を覆う天面部５２３と、コア及びコイルの側方を覆う外壁５２４と、外壁より内側に形成されている内壁５１４とを有し、コイルの側方を覆う内壁で囲われた第１の収納部５１と、コアの側方を覆う外壁で囲われた第２の収納部５２とを備え、第１の収納部と第２収納部の空間に内壁と外壁の端面まで充填された封止放熱樹脂６を設け、内壁の端面が外壁の端面よりも冷却器に向かって突出するように形成され、コア及びコイルを冷却器に設置したときに、コア及びコイルの冷却器側となる面４１１、２１３が、封止放熱樹脂６を介して冷却器の冷却面７１に沿って保持されている。【選択図】図２A reactor cooling structure capable of downsizing a reactor and suppressing a decrease in cooling efficiency is provided. A storage unit 5 that covers an outer periphery of a core 41 and a coil 21 and a cooler 7 that is fixed to the storage unit are provided. The storage unit 5 includes a top surface portion 523 that covers the core and the coil, a core, The outer wall 524 that covers the side of the coil, and the inner wall 514 that is formed on the inner side of the outer wall, the first storage portion 51 that is surrounded by the inner wall that covers the side of the coil, and the side of the core are covered. A sealing heat-dissipating resin 6 filled to the end surfaces of the inner wall and the outer wall is provided in the space between the first storage portion and the second storage portion, and the end surface of the inner wall is the outer wall. When the core and the coil are installed in the cooler, the surfaces 411 and 213 on the cooler side of the core and the coil are disposed through the sealing heat-dissipating resin 6. Is held along the cooling surface 71 of the cooler. [Selection] Figure 2

Description

本願は、コアとコイルを有するリアクトルの冷却構造及びリアクトルを備えた電力変換装置に関するものである。 The present application relates to a cooling structure of a reactor having a core and a coil and a power converter including the reactor.

コアとコイルで構成されたリアクトルとリアクトルの冷却構造は従来から知られている。例えば、特許文献１においては、コアとコイルからなるリアクトルと、リアクトルを冷却する冷却器と、リアクトルの周囲に設けられた樹脂部を設け、樹脂部を冷却器にボルトで固定して一体形成したリアクトルの冷却構造が開示されている。
また、特許文献２においては、コイルの外周を内側樹脂部で覆うようにしてコイル成形体とし、このコイル成形体と磁性コアとの組立体の外周を覆う外側樹脂部を設けてリアクトルとして一体形成する構造が開示されている。 A reactor and a cooling structure of the reactor configured by a core and a coil are conventionally known. For example, in Patent Document 1, a reactor including a core and a coil, a cooler for cooling the reactor, and a resin portion provided around the reactor are provided, and the resin portion is integrally fixed to the cooler by bolts. A reactor cooling structure is disclosed.
In Patent Document 2, the outer periphery of the coil is covered with the inner resin portion to form a coil molded body, and the outer resin portion covering the outer periphery of the assembly of the coil molded body and the magnetic core is integrally provided as a reactor. Structure is disclosed.

特開２００７−１８０２２４号公報JP 2007-180224 A 特開２０１１−７１４６６号公報JP, 2011-71466, A

電気自動車などに搭載されるコンバータまたは電力変換装置の構成部品に利用されるリアクトルは、作動中に発熱するため、所定の温度以上にならないような放熱性が必要とされる。また、このようなリアクトルをコンバータまたは電力変換装置などに搭載するためには、搭載スペースの制約上、無駄空間を極力排除した小型化が要求される。 A reactor used as a component of a converter mounted on an electric vehicle or the like or a component of a power converter generates heat during operation, and therefore, it is necessary to have a heat dissipating property not to be higher than a predetermined temperature. Moreover, in order to mount such a reactor in a converter, a power conversion device, or the like, size reduction that eliminates wasted space as much as possible is required due to the restriction of the mounting space.

リアクトルの小型化と合わせて放熱性を併せ持つために、例えば特許文献１および特許文献２に示されているリアクトルのように、コアとコイルまたはコイルの組合体を一体で樹脂により覆う構造では、小型化を図ることが出来るものの、コアとコイルの外周を樹脂により覆うことで放熱性の妨げとなる。 In order to have heat dissipation as well as miniaturization of the reactor, it is possible to use a structure in which the combination of the core and coil or coil is integrally covered with resin, as in the reactors shown in Patent Document 1 and Patent Document 2, for example. However, covering the outer periphery of the core and the coil with a resin interferes with the heat dissipation.

また、特許文献１においては、コアの形状あるいはコアに伝熱部を近接させるなどの工夫をすることにより、コアの放熱性の低下の抑制を図ることが出来るものの、コアの底面も含んで一体形成するように樹脂で覆っており、放熱性の妨げとなると共に樹脂のクリープ変形などが懸念され、またスプリングなどで樹脂の押圧が必要なため、スプリングの設置スペースが必要となり小型化の妨げとなる。 Further, in Patent Document 1, although the heat radiation property of the core can be suppressed from being lowered by making the heat transfer portion close to the shape of the core or the core, the bottom surface of the core is also integrated. As it is covered with resin to form it, it may interfere with heat dissipation and may be subject to creep deformation of the resin, and it is necessary to press the resin with a spring etc., and the installation space of the spring is required, which hinders miniaturization. Become.

また、特許文献２においては、同様にコアの形状を工夫及びコア及びコイルの底面を露出することにより、コア及びコイルの放熱性の低下の抑制を図ることが出来るものの、コアまたはコイルの底面以外は樹脂で覆われているため放熱性の妨げとなる。
また、樹脂で覆われていることにより粉塵及び腐食など外部環境からの保護を図ることが出来るが、コアまたはコイルを露出させて直接、冷却器などに固定することにより電力変換装置などに実装された際に、振動によるコアとコイルと冷却器との接触による破壊及び絶縁性などに懸念がある。 Further, in Patent Document 2, although it is possible to suppress the decrease in heat dissipation of the core and the coil by devising the shape of the core and exposing the bottoms of the core and the coil in the same manner, Because it is covered with a resin, it interferes with heat dissipation.
Moreover, although it can aim at protection from external environments, such as dust and corrosion, by being covered with resin, it is mounted in a power converter etc. by exposing a core or a coil and fixing to a cooler etc. directly. At the same time, there is a concern about destruction and insulation due to contact between the core, coil and cooler due to vibration.

また、外側コア部の断面積が内側コアの断面積と同程度となるように断面積を設定し、形状変更させて小型化を図ることが出来るものの、コアを露出させた部分の面積が低下することとなり上記と矛盾して放熱性の妨げとなる。
いずれにしても特許文献１及び特許文献２に示される樹脂は、剛性のある部品の骨格を形成する「射出成形用樹脂」を持いており、この「射出成形用樹脂」は一般的に熱伝導率が悪いため、コア及びコイルに直接接して全周を包むように構成した場合は放熱性が妨げられます。 In addition, although the cross-sectional area can be set so that the cross-sectional area of the outer core portion becomes approximately the same as the cross-sectional area of the inner core and the shape can be changed to achieve miniaturization, the area of the exposed portion of the core decreases. In contradiction to the above, it becomes the hindrance of heat dissipation.
In any case, the resins shown in Patent Document 1 and Patent Document 2 have “injection molding resin” which forms a skeleton of a rigid part, and this “injection molding resin” is generally thermally conductive. Because the rate is poor, if it is configured to wrap the entire circumference directly in contact with the core and coil, the heat dissipation will be hindered.

本願は、上記のような課題を解決するためになされたものであり、目的とするところは、小型で且つ放熱性を兼ね備えたリアクトルの冷却構造及び電力変換装置を提供することにある。 The present application has been made to solve the above-described problems, and an object of the present invention is to provide a reactor cooling structure and a power conversion device that are compact and have heat dissipation.

本願に係るリアクトルの冷却構造は、磁性体のコアと、コアに巻回されるコイルと、コアとコイルの外周を覆う収納部と、収納部に固定部材を介して固定される冷却器を備えたリアクトルの冷却構造において、収納部は、コア及びコイルの上方を覆う天面部と、コア及びコイルの側方を覆う外壁と、外壁より内側に形成されている内壁とを有し、コイルの側方を覆う内壁で囲われた第１の収納部と、コアの側方を覆う外壁で囲われた第２の収納部とを備え、第１の収納部と第２の収納部の空間に内壁と外壁の端面まで充填された封止放熱樹脂を設け、内壁の端面が外壁の端面よりも冷却器に向かって突出するように形成され、リアクトルを冷却器に設置したときに、コア及びコイルの冷却器側となる面が、封止放熱樹脂を介して冷却器の冷却面に沿って保持されているものである。 The reactor cooling structure according to the present application includes a core of a magnetic body, a coil wound around the core, a storage portion covering the core and the outer periphery of the coil, and a cooler fixed to the storage portion via a fixing member. In the reactor cooling structure, the housing portion has a top surface portion covering the upper side of the core and the coil, an outer wall covering the side of the core and the coil, and an inner wall formed inside the outer wall, And a second storage section surrounded by an outer wall covering the side of the core, and the inner wall of the space between the first storage section and the second storage section And the end face of the inner wall is formed to project more toward the cooler than the end face of the outer wall, and when the reactor is installed in the cooler, the core and the coil are The surface which becomes the cooler side is cooling of the cooler via the sealing heat dissipation resin Those held along.

本願によれば、リアクトルの小型化を図り、冷却効率が低下することを抑制することが出来るリアクトルの冷却構造が得られる。 According to the present application, it is possible to obtain a reactor cooling structure that can miniaturize the reactor and can suppress a decrease in cooling efficiency.

実施の形態１に使用されるリアクトルの斜視図である。FIG. 2 is a perspective view of a reactor used in the first embodiment. 実施の形態１のリアクトルの冷却構造の縦断面図である。FIG. 2 is a longitudinal cross-sectional view of the cooling structure of the reactor of Embodiment 1; 実施の形態１のリアクトルの第１の収納部の斜視図と分解斜視図である。FIG. 6 is a perspective view and an exploded perspective view of a first storage portion of the reactor of Embodiment 1; 実施の形態１のリアクトルの冷却構造の横断面図である。FIG. 2 is a cross-sectional view of the cooling structure of the reactor of Embodiment 1; 実施の形態１のリアクトルの第１の収納部の側面図と断面図である。FIG. 6A is a side view and a cross-sectional view of a first storage unit of the reactor of Embodiment 1; 実施の形態１のリアクトルの冷却構造を備えたコンバータ及び電力変換装置の一例を示す概略回路構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic circuit block diagram which shows an example of the converter provided with the cooling structure of the reactor of Embodiment 1, and a power converter device. 実施の形態２のリアクトルの冷却構造の縦断面図である。FIG. 7 is a longitudinal cross-sectional view of a cooling structure of a reactor of a second embodiment. 実施の形態２のリアクトルの収納部の斜視図と分解斜視図である。They are the perspective view and the disassembled perspective view of the accommodating part of the reactor of Embodiment 2. FIG. 実施の形態３のリアクトルの冷却構造の縦断面図である。FIG. 14 is a longitudinal cross-sectional view of a cooling structure of a reactor according to Embodiment 3.

実施の形態１．
以下、本願の実施の形態１におけるリアクトルの冷却構造を図１から図５に基づいて説明する。
図１は実施の形態１に使用されるリアクトルを示す斜視図で、図１（ａ）は外観図、図１（ｂ）は収納部の底面部から見て封止放熱樹脂を取り除いた図である。図２は実施の形態１におけるリアクトルの冷却構造を示す縦断面図、図３は収納部の第１の収納部を示す分解斜視図、図４はリアクトルの冷却構造を示す横断面図、図５は収納部の第１の収納部の側面図と断面図である。 Embodiment 1
Hereinafter, the cooling structure of the reactor in Embodiment 1 of the present application will be described based on FIGS. 1 to 5.
FIG. 1 is a perspective view showing a reactor used in the first embodiment, and FIG. 1 (a) is an external view, and FIG. 1 (b) is a view from which a sealing heat radiation resin is removed as viewed from the bottom of the housing is there. 2 is a longitudinal sectional view showing a cooling structure of a reactor according to the first embodiment, FIG. 3 is an exploded perspective view showing a first accommodation portion of the accommodation portion, FIG. 4 is a transverse sectional view showing a cooling structure of the reactor, FIG. 8A is a side view and a cross-sectional view of a first storage unit of the storage unit.

図１および図２に示すように、リアクトル１は、巻線を螺旋状に巻回して形成された断面が略矩形の一対のコイル２１、２２を有するコイル部２と、一対のＵ字状の磁性体で構成された分割コア４１、４２を有し、断熱性を持つ絶縁テープ３が外周に巻かれた口字状のコア部４と、第１の収納部５１と第２の収納部５２とからなり、第１の収納部５１においてコイル部２を覆うとともに、第２の収納部５２においてコイル部２及びコア部４を覆う樹脂製の収納部５と、第１の収納部５１と第２の収納部５２の空間に充填される封止放熱樹脂６とからなっている。 As shown in FIG. 1 and FIG. 2, the reactor 1 is formed by winding a winding in a spiral, and has a coil portion 2 having a pair of coils 21 and 22 having a substantially rectangular cross section, and a pair of U-shaped A letter-shaped core portion 4 having split cores 41 and 42 made of magnetic material and having a heat insulating insulating tape 3 wound around the outer periphery, a first storage portion 51 and a second storage portion 52 The first housing 51 covers the coil 2 and the second housing 52 covers the resin 2 and the core 4 and the first housing 51 and the first housing 51. It comprises the sealing heat radiation resin 6 with which the space of the storage part 52 of 2 is filled.

収納部５は、コア部４及びコイル部２の上方を覆う天面部５１３、５２３と、コア部４の側方を覆う外壁５２４と、外壁５２４より内側に形成されコイル部２の側方を覆う内壁５１４とを有している。第１の収納部５１はコイル部２の側方を覆う内壁５１４と天面部５１３で囲われて構成され、底面は開放されている。また第２の収納部５２はコア部４の側方を覆う外壁５２４と天面部５２３で囲われて構成され、底面は開放されている。 The storage portion 5 is formed on the top surface portions 513 and 523 covering the upper side of the core portion 4 and the coil portion 2, an outer wall 524 covering the side of the core portion 4, and the outer wall 524 inside to cover the side of the coil portion 2. And an inner wall 514. The first housing portion 51 is constituted by an inner wall 514 covering the side of the coil portion 2 and a top surface portion 513, and the bottom surface is open. Further, the second storage portion 52 is configured by being surrounded by an outer wall 524 covering the side of the core portion 4 and a top surface portion 523, and the bottom surface is opened.

コイル２１、２２の軸線は互いに平行であり、コイル２１、２２の配列方向はコイル２１、２２の軸線と直交している。コイル２１、２２は、上面は天面部５１３により、側面は内壁５１４により覆われた第１の収納部５１に収納されている。また、コイル２１、２２の一端及び他端には、コイル２１、２２の軸線方向及び配列方向と直交する一方向に引き出される引出線２１１、２２１が設けられている。引出線２１１、２２１は、電源などの外部装置又は基板などの端子に接続されるもので、第１の収納部５１及び第２の収納部５２の天面に形成された導通口５１２、５２２から導出して上方に突出している。 The axes of the coils 21 and 22 are parallel to each other, and the arrangement direction of the coils 21 and 22 is orthogonal to the axes of the coils 21 and 22. The upper surfaces of the coils 21 and 22 are accommodated by the top surface portion 513 and the side surfaces of the coils 21 and 22 are accommodated in the first accommodating portion 51 covered by the inner wall 514. Further, at one end and the other end of the coils 21, 22, lead wires 211, 221 drawn out in one direction orthogonal to the axial direction and the arrangement direction of the coils 21, 22 are provided. The lead wires 211 and 221 are connected to terminals such as an external device such as a power source or a substrate, and from the conduction ports 512 and 522 formed on the top surfaces of the first storage unit 51 and the second storage unit 52. It is derived and protrudes upward.

コア部４は、互いに対向する一対の分割コア４１、４２を組み合わせ、全体として口字状をなすものである。分割コア４１、４２は、対向する２つの直線部と、直線部を連結する曲線部から構成されてＵ字状をなし、２つの直線部の一部又は全部がコイル２１、２２にそれぞれ挿入される。なお、実施の形態１では分割コア４１、４２をそれぞれＵ字状の一部材としているが、分割コア４１、４２を曲線部と直線部でさらに分割してもよい。磁性体からなるコア部４は、例えば金属軟磁性粉末で形成されるが、電磁鋼板により構成されても良い。 The core portion 4 is formed in a letter shape as a whole by combining a pair of divided cores 41 and 42 facing each other. The split cores 41 and 42 are formed of two opposing straight portions and a curved portion connecting the straight portions to form a U shape, and part or all of the two straight portions are respectively inserted into the coils 21 and 22. Ru. In the first embodiment, the split cores 41 and 42 are each formed as one U-shaped member, but the split cores 41 and 42 may be further split into a curved portion and a straight portion. Although the core part 4 which consists of magnetic bodies is formed, for example with a metal soft-magnetic powder, you may be comprised with an electromagnetic steel plate.

コイル２１、２２の巻線には主に銅からなる平角線が用いられる。平角線は断面が矩形の銅線であり電気抵抗が小さい。リアクトル１に使用するコイル２１、２２では平角線の幅広の面をコイル長手方向に巻く。換言すれば、幅の狭い面をコイルの半径方向に向けて巻く。そのような巻き方はエッジワイズまたは縦巻きと言われている。 A flat wire mainly made of copper is used for winding the coils 21 and 22. The rectangular wire is a copper wire having a rectangular cross section and has a small electrical resistance. In the coils 21 and 22 used for the reactor 1, the wide surface of the flat wire is wound in the longitudinal direction of the coil. In other words, the narrow surface is wound in the radial direction of the coil. Such winding is said to be edgewise or vertical.

コイル２１、２２は、一本の巻線で連続的に形成してもよいし、コイル２１、２２を別の巻線で形成し、それぞれの一端同士を溶接などで接合してもよい。また、コイル２１、２２を接合せずに、それぞれ独立したコイル２１、２２としてもよい。また、実施の形態１では平角線の巻線を用いたエッジワイズのコイル２１、２２を形成しているが、断面円形状の巻線を用いてコイル２１、２２を形成してもよい。 The coils 21 and 22 may be formed continuously by one winding, or the coils 21 and 22 may be formed by another winding, and one end of each may be joined by welding or the like. Alternatively, the coils 21 and 22 may be independent coils 21 and 22 without being joined to each other. Further, in the first embodiment, the edgewise coils 21 and 22 are formed using the flat wire winding, but the coils 21 and 22 may be formed using a winding having a circular cross section.

収納部５は一例をあげるとポリエチレンテレフタレート樹脂を用いることが出来る。また、収納部５はボルトにより冷却器７に固定されるボルトの穴および冷却器７との位置決め（図示省略）などの固定手段を備える。
第１の収納部５１を形成する内壁５１４の下側の端面は、第２の収納部５２を形成する外壁５２４の下側の端面よりも冷却器７に向かって突出するように形成されている。また、内壁５１４の下側の端面は、コイル２１、２２の冷却器７側となる面２１３、２１４より突出するように形成され、外壁５２４の下側の端面は、分割コア４１、４２の冷却器７側となる面４１１、４２１よりも突出するように形成されている。 For example, a polyethylene terephthalate resin can be used for the storage unit 5. Moreover, the storage part 5 is provided with fixing means, such as positioning (not shown) with the hole of the volt | bolt fixed to the cooler 7 with a volt | bolt, and the cooler 7. As shown in FIG.
The lower end surface of the inner wall 514 forming the first storage portion 51 is formed to project more toward the cooler 7 than the lower end surface of the outer wall 524 forming the second storage portion 52. . Further, the lower end surface of the inner wall 514 is formed to project from the surfaces 213 and 214 on the side of the cooler 7 of the coils 21 and 22, and the lower end surface of the outer wall 524 is for cooling the split cores 41 and 42 It is formed to project more than the surfaces 411 and 421 on the side of the unit 7.

内壁５１４の下側の端面のコイル２１、２２からの突出長さおよび外壁５２４の下側の端面の分割コア４１、４２からの突出長さは、内壁５１４の厚みより小さくなっている。
換言すれば、コイル２１、２２の冷却器７側となる面２１３、２１４と冷却器７の冷却面７２との間に介在する封止放熱樹脂６の厚みと、分割コア４１、４２の冷却器７側となる面４１１、４２１と冷却器７の冷却面７１、７３との間に介在する封止放熱樹脂６の厚みは、内壁５１４の厚みより小さい。
さらにリアクトル１のコア部４と冷却器７の冷却面７１、７３との間に介在する封止放熱樹脂６の厚み、およびリアクトル１のコイル部２と冷却器７の冷却面７２との間に介在する封止放熱樹脂６の厚みは、それぞれ一定の厚みで、且つ内壁５１４の厚みより小さく設けられることにより冷却効率の低下の抑制につながる。 The protruding length of the lower end surface of the inner wall 514 from the coils 21 and 22 and the protruding length of the lower end surface of the outer wall 524 from the split cores 41 and 42 are smaller than the thickness of the inner wall 514.
In other words, the thickness of the sealing heat radiation resin 6 interposed between the surfaces 213 and 214 on the coil 7 side of the coils 21 and 22 and the cooling surface 72 of the cooler 7 and the cooler of the split cores 41 and 42 The thickness of the sealing radiation resin 6 interposed between the surfaces 411 and 421 on the seventh side and the cooling surfaces 71 and 73 of the cooler 7 is smaller than the thickness of the inner wall 514.
Furthermore, the thickness of sealing radiation resin 6 interposed between core portion 4 of reactor 1 and cooling surfaces 71 and 73 of cooler 7 and between coil portion 2 of reactor 1 and cooling surface 72 of cooler 7 The thickness of the intervening sealing heat-radiating resin 6 is set to a constant thickness and smaller than the thickness of the inner wall 514, which leads to suppression of the decrease in cooling efficiency.

封止放熱樹脂６は、内壁５１４の端面および外壁５２４の端面と同じ面までになるよう第１の収納部５１と第２の収納部５２の空間に充填される。また、封止放熱樹脂６の硬度は第１の収納部５１および第２の収納部５２を形成する樹脂の硬度よりも低い。例えば、第１の収納部５１および第２の収納部５２は従来と同じ射出成形用樹脂で構成されるが、封止放熱樹脂６は射出成形用樹脂よりも硬度が低いシリコーンなどに熱伝導率の高いフィラーを含有して形成される。
これにより第１の収納部５１および第２の収納部５２に充填される封止放熱樹脂６は硬化後に一定の弾性があるゲル状に形成され、この封止放熱樹脂６がコア部４とコイル部２と直接接するため、コア部４及びコイル部２の変形及び破壊を抑制して安定して固定できる。 The sealing heat-radiating resin 6 is filled in the space of the first storage portion 51 and the second storage portion 52 so as to reach the same surface as the end surface of the inner wall 514 and the end surface of the outer wall 524. Further, the hardness of the sealing heat-radiating resin 6 is lower than the hardness of the resin forming the first housing portion 51 and the second housing portion 52. For example, although the first storage unit 51 and the second storage unit 52 are made of the same resin for injection molding as in the prior art, the heat dissipation resin 6 has a heat conductivity to silicone etc. whose hardness is lower than that of the resin for injection molding Is formed to contain high fillers.
Thus, the sealing heat-radiating resin 6 filled in the first housing portion 51 and the second housing portion 52 is formed in a gel shape having a certain elasticity after curing, and the sealing heat-radiating resin 6 is formed into the core portion 4 and the coil Since it is in direct contact with the portion 2, deformation and breakage of the core portion 4 and the coil portion 2 can be suppressed and stably fixed.

冷却器７は、リアクトル１の実装側となる実装面５１１および実装面５２１に沿って段差を付けて冷却面７１、７２、７３が形成されている。リアクトル１を収納した収納部５はボルト（図示省略）などの固定部材を介して冷却器７に固定される。
コイル部２の冷却器７側となる面２１３、２１４と冷却器７の冷却面７２との間に介在する封止放熱樹脂６の厚みと、コア部４の冷却器７側となる面４１１、４２１と冷却器７の冷却面７１、７３との間に介在する封止放熱樹脂６の厚みは、それぞれ一定の厚みで、その厚みは同じでも異なっていてもよい。
従って、リアクトル１を冷却器７に設置したときに、コイル部２の冷却器７側となる実装面５１１と冷却器７の冷却面７２との距離、およびコア部４の冷却器７側となる実装面５２１と冷却器７の冷却面７１、７３との距離が、同じ均一の距離となる。即ち、コア部４及びコイル部２の冷却器７側となる実装面５１１、５２１が、封止放熱樹脂６を介して冷却器７の冷却面７１、７２、７３に沿って均一な所定間隔で保持されるので、リアクトル１の放熱性を向上させることができる。 The cooler 7 is provided with steps along the mounting surface 511 and the mounting surface 521 on the mounting side of the reactor 1 to form the cooling surfaces 71, 72, 73. Storage part 5 which stored reactor 1 is fixed to cooler 7 via fixing members, such as a bolt (illustration abbreviation).
The thickness of the sealing heat-radiating resin 6 interposed between the surfaces 213 and 214 on the cooler 7 side of the coil unit 2 and the cooling surface 72 of the cooler 7, the surface 411 on the cooler 7 side of the core unit 4, The thickness of the sealing heat-radiating resin 6 interposed between 421 and the cooling surfaces 71 and 73 of the cooler 7 may be the same or different.
Therefore, when the reactor 1 is installed in the cooler 7, the distance between the mounting surface 511 on the cooler 7 side of the coil portion 2 and the cooling surface 72 of the cooler 7 and the cooler 7 on the core portion 4 The distance between the mounting surface 521 and the cooling surfaces 71 and 73 of the cooler 7 is the same uniform distance. That is, the mounting surfaces 511 and 521 on the core 7 and the coil 2 on the side of the cooler 7 are evenly spaced along the cooling surfaces 71, 72 and 73 of the cooler 7 via the sealing heat dissipation resin 6. Since it is hold | maintained, the heat dissipation of the reactor 1 can be improved.

また、第１の収納部５１および第２の収納部５２の冷却器７側となる実装面５１１、５２１と冷却器７の冷却面７１、７２、７３との間に放熱部材８を配置している。この放熱部材８により、リアクトル１を冷却器７に固定する際の組立ばらつきによる生じる隙間を抑制することが出来る。放熱部材８は、一例を挙げるとシリコーンなどのグリースを塗布するが、シート状に成形されたものを設置してもよい。このようにすることでリアクトル１の冷却効率の低下を抑制することが出来る。また、第１の収納部５１および第２の収納部５２の両方又はどちらか一方は、放熱部材８よりも熱伝導率が高い樹脂で形成されている。 Further, the heat dissipation member 8 is disposed between the mounting surfaces 511 and 521 on the cooler 7 side of the first storage unit 51 and the second storage unit 52 and the cooling surfaces 71, 72 and 73 of the cooler 7. There is. The heat dissipation member 8 can suppress the gap caused by the assembly variation when fixing the reactor 1 to the cooler 7. The heat dissipating member 8 applies grease such as silicone, for example, but a sheet-shaped one may be installed. By doing this, it is possible to suppress a decrease in the cooling efficiency of the reactor 1. Further, one or both of the first storage portion 51 and the second storage portion 52 are formed of a resin having a thermal conductivity higher than that of the heat dissipation member 8.

また、第２の収納部５２は分割コア４１、４２とコイル部２の外周に沿って封止放熱樹脂６が内壁５１４の厚みより小さい厚みになるように均一な距離を保って覆うように形成されている。換言すると封止放熱樹脂６の使用量を削減するとともに封止放熱樹脂６の厚みを均一に保つことが出来る。このようにすることでリアクトル１の冷却効率の低下を抑制することが出来る。 Further, the second housing portion 52 is formed along the outer circumferences of the split cores 41 and 42 and the coil portion 2 so as to keep the uniform distance and cover so that the sealing heat-dissipating resin 6 has a thickness smaller than the thickness of the inner wall 514 It is done. In other words, the amount of use of the sealing heat-radiating resin 6 can be reduced and the thickness of the sealing heat-radiating resin 6 can be kept uniform. By doing this, it is possible to suppress a decrease in the cooling efficiency of the reactor 1.

また、分割コア４１、４２を覆う天面部５２３とコイル２１、２２を覆う天面部５１３に高低差を設けることにより、即ち、図１（ａ）に示すように、分割コア４１、４２の上方を覆う天面部５２３はコイル２１、２２の上方を覆う天面部５１３よりも低くすることで、リアクトル１の周囲に図２に示すような空間９が形成され、有効空間として利用することが出来る。
なお、実施の形態１では、収納部５の第１の収納部５１と第２の収納部５２は別体で形成されているが、一体で形成することも可能である。
以降第１の収納部５１と第２の収納部５２を別体で形成する際の構成について図３を参照してさらに詳しく説明する。 Further, by providing a height difference between the top surface 523 covering the split cores 41 and 42 and the top surface 513 covering the coils 21 and 22, that is, as shown in FIG. 1A, the upper side of the split cores 41 and 42 is The space 9 as shown in FIG. 2 is formed around the reactor 1 by making the covering top surface 523 lower than the top surface 513 covering the upper side of the coils 21 and 22, and it can be used as an effective space.
In the first embodiment, the first storage unit 51 and the second storage unit 52 of the storage unit 5 are separately formed, but may be integrally formed.
Hereinafter, the configuration when the first storage unit 51 and the second storage unit 52 are separately formed will be described in more detail with reference to FIG.

図３（ａ）はリアクトル１の第１の収納部５１の斜視図、図３（ｂ）は第１の収納部５１の分解斜視図を示す。
図３において、第１の収納部５１は、分割コア４１、４２とコイル２１、２２の間に形成され、コイル２１、２２を保持する筒状部１０と、この筒状部１０をコイル２１、２２の軸線方向と同じ方向から導通させて保持する箱状部１１の組合体から形成されている。さらに筒状部１０は軸線方向で分割された第１の筒状部１０１と第２の筒状部１０２から形成されている。 FIG. 3A is a perspective view of the first storage unit 51 of the reactor 1, and FIG. 3B is an exploded perspective view of the first storage unit 51.
In FIG. 3, the first storage portion 51 is formed between the split cores 41 and 42 and the coils 21 and 22 and has a cylindrical portion 10 for holding the coils 21 and 22, and the cylindrical portion 10 is a coil 21, It is formed of a combination of box-like parts 11 which are held in conduction from the same direction as the axial direction of the shaft 22. Furthermore, the cylindrical portion 10 is formed of a first cylindrical portion 101 and a second cylindrical portion 102 which are divided in the axial direction.

第１の筒状部１０１と第２の筒状部１０２は、それぞれ内部に分割コア４１、４２の直線部の一部又は全部がそれぞれ挿入されるとともに、コイル２１、２２がそれぞれ周囲に巻き回される断面が略矩形の一対の筒部１０１１、１０１２、１０１３、１０１４と、この筒部の端部に筒部１０１１、１０１２、１０１３、１０１４の径方向に広がるフランジ１０１５、１０１６を備える。 In the first cylindrical portion 101 and the second cylindrical portion 102, a portion or all of the straight portions of the split cores 41 and 42 are respectively inserted inside, and the coils 21 and 22 are respectively wound around A pair of cylindrical sections 1011, 1012, 1013, 1014 having a substantially rectangular cross section, and flanges 1015, 1016 that extend in the radial direction of the cylindrical sections 1011, 1012, 1013, 1014 at the end of the cylindrical section.

なお、コイル２１、２２は、その剛性により螺旋状に巻かれた状態を維持できるため、リアクトル１を組み立てる際には予め巻き回した状態のコイル２１、２２を箱状部１１に収納し、第１の筒状部１０１と第２の筒状部１０２の筒部１０１１、１０１２、１０１３、１０１４を箱状部１１の導通口１１１、１１２、１１３、１１４に通すことにより、分割コア４１、４２とコイル２１、２２を組み付ける。コイル２１、２２に挿入された筒部１０１１、１０１２、１０１３、１０１４の外周面は、それぞれコイル２１、２２の内周面に当接する。 Since the coils 21 and 22 can maintain the spirally wound state due to their rigidity, the coils 21 and 22 in a state of being wound in advance are accommodated in the box-like portion 11 when the reactor 1 is assembled. The divided cores 41 and 42 and the cylindrical portions 101 and 102 of the second cylindrical portion 102 are passed through the conduction ports 111, 112, 113 and 114 of the box-like portion 11, respectively. The coils 21 and 22 are assembled. The outer peripheral surfaces of the cylindrical portions 1011, 1012, 1013 and 1014 inserted into the coils 21 and 22 respectively abut the inner peripheral surfaces of the coils 21 and 22.

筒部１０１１、１０１２、１０１３、１０１４の長さについては、一方が他方より長い或いは一方にのみ筒部が形成され他方は受けとなるフランジ１０１５あるいは１０１６のみで形成されても良い。
第１の筒状部１０１は、フランジ１０１５の内側面に突起状の第１の嵌合部１０１７、１０１８、１０１９、１０２０が形成されている。また、第２の筒状部１０２は、フランジ１０１６の内側面に突起状の第１の嵌合部１０２１、１０２２、１０２３、１０２４が形成されている。 The lengths of the cylindrical portions 1011, 1012, 1013, and 1014 may be formed only by the flanges 1015 or 1016, one of which is longer than the other or the cylindrical portion is formed on one side and the other is a receiver.
In the first tubular portion 101, protruding first fitting portions 1017, 1018, 1019, 1020 are formed on the inner side surface of the flange 1015. Further, in the second cylindrical portion 102, protruding first fitting portions 1021, 1022, 1023, and 1024 are formed on the inner side surface of the flange 1016.

一方、第１の嵌合部１０１７から１０２０と対向した箱状部１１の面には、第１の嵌合部１０１７から１０２０と嵌合する穴状の第２の嵌合部１１１１、１１１２、１１１３が形成されている。また、第１の嵌合部１０２１から１０２４と対向した箱状部１１の面には、第１の嵌合部１０２１から１０２４と嵌合する穴状の第２の嵌合部１１１４、１１１５、１１１６が形成されている。 On the other hand, on the surface of the box-like portion 11 opposed to the first fitting portions 1017 to 1020, hole-shaped second fitting portions 1111, 1112, 1113 to be fitted to the first fitting portions 1017 to 1020. Is formed. Also, on the surface of the box-like portion 11 facing the first fitting portions 1021 to 1024, hole-shaped second fitting portions 1114, 1115, 1116 to be fitted with the first fitting portions 1021 to 1024. Is formed.

第１の嵌合部１０１７から１０２０、第１の嵌合部１０２１から１０２４と、第２の嵌合部１１１１から１１１３、第２の嵌合部１１１４から１１１６が嵌合すると筒状部１０と箱状部１１の位置が正確に組み合わされて、図３（ａ）の状態となる。
また、第１の嵌合部１０１７から１０２０および第１の嵌合部１０２１から１０２４が、第１の収納部５１に組付けされるコイル２１、２２の下方面の受けとなる。第１の嵌合部の中で第１の嵌合部１０１７、１０２０、１０２１、１０２４と、第２の嵌合部の中で第２の嵌合部１１１１、１１１３、１１１４、１１１６のみで位置が正確に組み合わさる。 When the first fitting portions 1017 to 1020, the first fitting portions 1021 to 1024, the second fitting portions 1111 to 1113, and the second fitting portions 1114 to 1116 are fitted, the tubular portion 10 and the box The positions of the protuberances 11 are accurately combined, resulting in the state of FIG. 3 (a).
Further, the first fitting portions 1017 to 1020 and the first fitting portions 1021 to 1024 serve as supports for the lower surfaces of the coils 21 and 22 assembled to the first storage portion 51. In the first fitting portion, the position is determined only by the first fitting portions 1017, 1020, 1021, and 1024, and in the second fitting portion, only the second fitting portions 1111, 1113, 1114, and 1116. Accurately combine.

残りの第１の嵌合部１０１８、１０１９、１０２２、１０２３と第２の嵌合部１１１２、１１１５は、第１の嵌合部の中で第１の嵌合部１０１７、１０２０、１０２１、１０２４と第２の嵌合部の中で第２の嵌合部１１１１、１１１３、１１１４、１１１６と合わさることでコイル２１、２２の下方面の受けとして備える。
第１の嵌合部１０１７から１０２０および第１の嵌合部１０２１から１０２４と、第２の嵌合部１１１１から１１１３および第２の嵌合部１１１４から１１１６の形状について、円筒と円または楕円の穴との組み合わせで形成しているが、多角形の組み合わせでもよい。 The remaining first fitting portions 1018, 1019, 1022, 1023 and the second fitting portions 1112 and 1115 are the first fitting portions 1017, 1020, 1021, 1024 and the like in the first fitting portion. The second fitting portion 1111, 1113, 1114, 1116 is combined with the second fitting portions 1111, 1113, 1114, 1116 so as to receive the lower surfaces of the coils 21, 22.
The shapes of the first fitting portions 1017 to 1020 and the first fitting portions 1021 to 1024, the second fitting portions 1111 to 1113, and the second fitting portions 1114 to 1116 are cylindrical and circular or oval. Although formed in combination with a hole, it may be a combination of polygons.

コイル受けについて図４を参照して説明する。図４はリアクトル１の冷却構造の横断面図である。
図４において、第１の嵌合部１０１７から１０２０、１０２１から１０２４（図示省略）はコイル２１、２２の下方角部を受けて、上下面方向を正確に位置合わせする。換言すれば、コイル２１、２２の冷却器７側となる面２１３、２１４と冷却器７の冷却面７２との間に介在する封止放熱樹脂６の厚みを一定にすることが出来る。 The coil receiver will be described with reference to FIG. FIG. 4 is a cross-sectional view of the cooling structure of the reactor 1.
In FIG. 4, first fitting portions 1017 to 1020 and 1021 to 1024 (not shown) receive the lower corners of the coils 21 and 22 and accurately align the upper and lower surface directions. In other words, the thickness of the sealing heat-radiating resin 6 interposed between the surfaces 213 and 214 on the coil 7 side of the coils 21 and 22 and the cooling surface 72 of the cooler 7 can be made constant.

第１の嵌合部１０１７から１０２０および第１の嵌合部１０２１から１０２４と、第２の嵌合部１１１１から１１１３および第２の嵌合部１１１４から１１１６は、コイル受けとして、実施の形態１ではフランジ１０１５、１０１６の下端の両端及び中央の３か所に設けられているが、コイル受けの数及び配置は、コイル２１、２２を側面方向及び上下方向位置決めできるのであれば特に限られるものではない。 The first fitting portions 1017 to 1020, the first fitting portions 1021 to 1024, the second fitting portions 1111 to 1113, and the second fitting portions 1114 to 1116 serve as coil receivers in the first embodiment. In this case, the flanges 1015 and 1016 are provided at both ends and at three positions at the lower end of the flange, but the number and arrangement of the coil receivers are not particularly limited as long as the coils 21 and 22 can be positioned in the side direction Absent.

さらに筒状部１０と箱状部１１の固定は、第１の嵌合部と第２の嵌合部との間に形成される隙間を、例えば接着剤により埋めて固着されている。換言すると第１の収納部５１と第２の収納部５２との接合部を隙間なく形成することが出来る。
このようにすることにより、第１の収納部５１と第２の収納部５２の空間に封止放熱樹脂６を充填するときに、第１の収納部５１に充填しても第１の収納部５１より低い第２の収納部５２に流出して、第２の収納部５２の封止放熱樹脂６の液面が上がることはなく充填することが出来る。換言すると第１の収納部５１と第２の収納部５２の高さが異なっても封止放熱樹脂６を充填することが出来る。 Furthermore, the cylindrical portion 10 and the box-like portion 11 are fixed by filling the gap formed between the first fitting portion and the second fitting portion with, for example, an adhesive. In other words, the joint between the first storage portion 51 and the second storage portion 52 can be formed without a gap.
By doing this, when filling the space of the first storage portion 51 and the second storage portion 52 with the sealing heat-radiating resin 6, the first storage portion 51 can be filled even if the first storage portion 51 is filled. It flows into the second housing portion 52 lower than 51, and the liquid surface of the sealing heat-radiating resin 6 of the second housing portion 52 can be filled without rising. In other words, even if the heights of the first storage portion 51 and the second storage portion 52 are different, the sealing heat-dissipating resin 6 can be filled.

また、第１の収納部５１と第２の収納部５２の一方の空間を他方の空間より、より熱伝導率が高い封止放熱樹脂６を充填するなどの選択することが出来る。
また、第１の収納部５１と第２の収納部５２の材料として、両方又はどちらか一方を樹脂の流動方向に熱伝導率が高い樹脂を選択する。即ち、第１の収納部５１および第２の収納部５２の材料として用いられる高熱伝導の成形樹脂材料は、樹脂の流動方向により熱伝導が変化するものが多い。そのため、第１の収納部５１と第２の収納部５２を製作する金型に流し込まれる樹脂は、樹脂の流動方向に対して高い熱伝導率のものが使用される。樹脂の流動方向を調整して第１の収納部５１または第２の収納部５２を形成することにより、第１の収納部５１または第２の収納部５２を放熱経路としてより熱を広げることが出来る。このようにすることでリアクトル１の冷却効率の低下を抑制することが出来る。 In addition, it is possible to select one space of the first storage portion 51 and the second storage portion 52 to be filled with the sealing heat dissipation resin 6 having a higher thermal conductivity than the other space.
Further, as a material of the first storage portion 51 and the second storage portion 52, a resin having a high thermal conductivity in the flow direction of the resin is selected as either or both. That is, in the molded resin material of high thermal conductivity used as the material of the first storage portion 51 and the second storage portion 52, the heat conduction changes in many cases depending on the flow direction of the resin. Therefore, as the resin poured into the mold for manufacturing the first storage portion 51 and the second storage portion 52, one having a high thermal conductivity in the flow direction of the resin is used. The first storage portion 51 or the second storage portion 52 may be used as a heat dissipation path by adjusting the flow direction of the resin to form the first storage portion 51 or the second storage portion 52. It can. By doing this, it is possible to suppress a decrease in the cooling efficiency of the reactor 1.

第１の筒状部１０１と第２の筒状部１０２の筒部１０１１から１０１４の内部について図５を参照して説明する。図５（ａ）は第１の収納部５１の側面図、図５（ｂ）は図５（ａ）のＡ−Ａ断面図である。
図５において、筒部１０１１から１０１４は、必要に応じて内部にスペーサ１２が設けられる。スペーサ１２は、コア部４が構成される際に分割コア４１、４２のそれぞれの対向面の間に一定の隙間を形成するもので、スペーサ１２により形成される隙間の大きさによりリアクトル１のインダクタンスが調整される。スペーサ１２は、分割コア４１、４２の軸線方向に延びる断面口字状の筒状部１２１と、筒状部１２１と筒部１０１１から１０１４の内周面を接続するリブ１２２とを備えている。 The insides of the cylindrical portions 1011 to 1014 of the first cylindrical portion 101 and the second cylindrical portion 102 will be described with reference to FIG. 5 (a) is a side view of the first storage unit 51, and FIG. 5 (b) is a cross-sectional view taken along the line A-A of FIG. 5 (a).
In FIG. 5, the cylindrical portions 1011 to 1014 are provided with a spacer 12 inside as needed. The spacer 12 forms a fixed gap between the facing surfaces of the split cores 41 and 42 when the core portion 4 is formed, and the inductance of the reactor 1 is determined by the size of the gap formed by the spacer 12. Is adjusted. The spacer 12 is provided with a tubular portion 121 extending in the axial direction of the split cores 41 and 42 and a rib 122 connecting the tubular portion 121 and the inner peripheral surfaces of the tubular portions 1011 to 1014.

リブ１２２は、筒状部１２１の周囲２方向以上に設けられるもので、実施の形態１では周方向に４箇所設けられている。リブ１２２の軸線方向長さは筒状部１２１の軸線方向長さよりも短く、筒状部１２１とリブ１２２との間で軸線方向について段差が生じている。すなわち、スペーサ１２には軸線方向の幅が周囲よりも大きい領域が中央部に設けられている。スペーサ１２は筒部１０１１から１０１４に分割して形成されているが、一方または他方の筒部に一体で形成されてもよい。スペーサ１２の製作については、部品点数及び組立工数の削減の観点から、筒状部１２１とリブ１２２を第１の筒状部１０１と第２の筒状部１０２と一体成形することが好ましい。 The ribs 122 are provided in two or more directions around the cylindrical portion 121. In the first embodiment, four ribs 122 are provided in the circumferential direction. The axial length of the rib 122 is shorter than the axial length of the cylindrical portion 121, and a step is generated between the cylindrical portion 121 and the rib 122 in the axial direction. That is, the spacer 12 is provided at its central portion with a region whose axial width is larger than that of the periphery. The spacer 12 is divided into the cylindrical portions 1011 to 1014, but may be integrally formed on one or the other cylindrical portion. In the manufacture of the spacer 12, it is preferable to integrally form the cylindrical portion 121 and the rib 122 with the first cylindrical portion 101 and the second cylindrical portion 102 from the viewpoint of reducing the number of parts and the number of assembling steps.

また、第１の収納部５１と第２の収納部５２は、いずれも天面部５１３、５２３にコイル２１、２２の引出線２１１、２２１の位置に合う導通口５１２、５２２が形成されている。導通口５１２、５２２はコイルの引出線２１１、２２１の通る最小の大きさで形成されており、導通口５１２、５２２を通すことによりコイル２１、２２の側面方向を正確に位置合わせする。
コイル２１、２２の引出線２１１、２２１と、第１の収納部５１および第２の収納部５２の導通口５１２、５２２との固定は、例えば接着剤により固着して密封することが考えられる。 Further, in each of the first housing portion 51 and the second housing portion 52, the top surface portions 513 and 523 are formed with conduction openings 512 and 522 that match the positions of the lead wires 211 and 221 of the coils 21 and 22, respectively. The conduction openings 512, 522 are formed in the smallest size through which the lead wires 211, 221 of the coil pass, and by passing the conduction openings 512, 522, the lateral direction of the coils 21, 22 is accurately aligned.
Fixing of the lead wires 211 and 221 of the coils 21 and 22 and the conduction openings 512 and 522 of the first storage unit 51 and the second storage unit 52 may be performed by, for example, fixing and sealing with an adhesive.

また、封止放熱樹脂６は一例をあげると、シリコーンにたとえばアルミナなどの熱伝導率のよい粉末を配合したものを用いることが出来る。そして、封止放熱樹脂６は収納部５よりも硬度が低いし、放熱部材８と同じ材質のもので形成している。
換言すると封止放熱樹脂６と冷却器７の冷却面７１から７３、あるいは放熱部材８との密着性を良くすることが出来る。このようにすることでリアクトル１の冷却効率の低下を抑制することが出来る。 In addition, as the sealing heat-radiating resin 6, for example, it is possible to use silicone in which a powder having a high thermal conductivity such as alumina is blended. The sealing heat-radiating resin 6 is lower in hardness than the housing portion 5 and is made of the same material as the heat-radiating member 8.
In other words, the adhesion between the sealing heat radiation resin 6 and the cooling surfaces 71 to 73 of the cooler 7 or the heat radiation member 8 can be improved. By doing this, it is possible to suppress a decrease in the cooling efficiency of the reactor 1.

次に、上記したリアクトルの冷却構造を備えたコンバータ及び電力変換装置について説明する。図６は実施の形態１におけるコンバータ及び電力変換装置の一例を示す概略の回路構成図である。
図６において、電力変換装置１０００は、バッテリ１００１と負荷１００２の間で電力変換を行うものであって、バッテリ１００１からの直流電力を交流電力に変換して負荷１００２に出力するとともに、負荷１００２からの交流電力を直流電力に変換してバッテリ１００１に出力するものである。電力変換装置１０００は、直流電圧を昇降圧させるコンバータ１１００と、直流と交流との相互変換を行うインバータおよびフィルタとしてのコンデンサを有するインバータ部１２００を備え、コンバータ１１００は、上述した冷却構造を有したリアクトル１と、複数のスイッチング素子１１０２と、スイッチング素子１１０２の動作を制御する駆動回路１１０３とを備えている。リアクトル１に流れる電流が増加し発熱しても上述した冷却構造により冷却効率が維持できる。 Next, a converter and a power converter provided with the above-described reactor cooling structure will be described. FIG. 6 is a schematic circuit configuration diagram showing an example of the converter and the power conversion device in the first embodiment.
In FIG. 6, the power conversion device 1000 performs power conversion between the battery 1001 and the load 1002, converts DC power from the battery 1001 into AC power, and outputs the AC power to the load 1002. AC power is converted to DC power and output to the battery 1001. The power converter 1000 includes a converter 1100 for stepping up and down a DC voltage, an inverter unit 1200 having an inverter for converting DC and AC to each other, and a capacitor as a filter, and the converter 1100 has the above-described cooling structure. The reactor 1, a plurality of switching elements 1102, and a drive circuit 1103 that controls the operation of the switching elements 1102 are provided. Even if the current flowing through the reactor 1 increases and heat is generated, the cooling efficiency can be maintained by the above-described cooling structure.

負荷１００２は、例えば三相交流モータであり、電力変換装置１０００がハイブリッド自動車に用いられる場合は走行時には車両を駆動し、回生時には発電機として機能する。スイッチング素子１１０２は、ＭＯＳＦＥＴ（ｍｅｔａｌ−ｏｘｉｄｅ−ｓｅｍｉｃｏｎｄｕｃｔｏｒｆｉｅｌｄ−ｅｆｆｅｃｔｔｒａｎｓｉｓｔｏｒ）又はＩＧＢＴ（ＩｎｓｕｌａｔｅｄＧａｔｅＢｉｐｏｌａｒ−Ｔｒａｎｓｉｓｔｏｒ）などのパワーデバイスを用いればよい。 The load 1002 is, for example, a three-phase AC motor, and when the power conversion device 1000 is used for a hybrid vehicle, the load 1002 drives the vehicle during traveling and functions as a generator during regeneration. The switching element 1102 may be a power device such as a metal-oxide-semiconductor field-effect transistor (MOSFET) or an insulated gate bipolar-transistor (IGBT).

車両の走行時、バッテリ１００１から入力される直流の入力電圧がコンバータ１１００により昇圧され、昇圧された入力電圧をインバータ部１２００が交流に変換する。回生時、負荷１００２から入力される交流の入力電圧がインバータ部１２００で直流に変換され、直流に変換された入力電圧がコンバータ１１００によりバッテリ１００１に適合する電圧まで降圧される。コンバータ１１００は、駆動回路１１０３によりスイッチング素子１１０２がオン、オフを繰り返すことで、入力された直流電圧を昇降圧させる。リアクトル１は、スイッチング素子１１０２のスイッチング動作によって回路を流れる電流が増減しようとしたとき、その変化を滑らかにする機能を持つ。 When the vehicle is traveling, the DC input voltage input from the battery 1001 is boosted by the converter 1100, and the boosted input voltage is converted into AC by the inverter unit 1200. At the time of regeneration, an alternating current input voltage input from the load 1002 is converted to direct current by the inverter unit 1200, and the input voltage converted to direct current is stepped down to a voltage compatible with the battery 1001 by the converter 1100. The converter 1100 raises and lowers the input DC voltage by repeating switching on and off of the switching element 1102 by the drive circuit 1103. The reactor 1 has a function of smoothing the change when the current flowing through the circuit is increased or decreased by the switching operation of the switching element 1102.

なお、図６の電力変換装置１０００およびコンバータ１１００は一例であり、電力変換装置１０００およびコンバータ１１００は、商用電源からの交流電力によりバッテリ１００１を充電する充電器としての電力変換装置、およびこの電力変換装置において直流電圧を昇圧させるコンバータとしてもよい。この場合、負荷１００２が商用電源に置き換わり、上記した回生時の動作の場合と同様に商用電源から入力される交流の入力電圧が直流に変換され、直流に変換された入力電圧がコンバータ１１００によりバッテリ１００１に適合する電圧まで昇圧される。 Power conversion device 1000 and converter 1100 in FIG. 6 are an example, and power conversion device 1000 and converter 1100 are a power conversion device as a charger that charges battery 1001 with AC power from a commercial power supply, and this power conversion The device may be a converter that boosts a DC voltage. In this case, the load 1002 is replaced by a commercial power supply, and the AC input voltage input from the commercial power supply is converted to DC as in the case of the above-described operation during regeneration, and the converter 1100 converts the DC input voltage into a battery The voltage is boosted to a voltage conforming to 1001.

実施の形態２．
次に、本願の実施の形態２におけるリアクトルの冷却構造を図７及び図８に基づいて説明する。
図７は、実施の形態２に係るリアクトルの冷却構造の縦断面図である。図８は実施の形態２に係るリアクトルの収納部の斜視図で、図８（ａ）はリアクトル１の収納部５の斜視図、図８（ｂ）は収納部５の分解斜視図である。なお、図１から図５と同じ又は相当部分については同一の符号を用いて説明を省略する。
実施の形態２におけるリアクトルの冷却構造は実施の形態１の変形例であって、収納部５の第１の収納部５１と第２の収納部５２を一体で形成している点が実施の形態１と異なる。なお、その他の事項については、実施の形態１と同様であるので、詳細な説明は省略する。 Second Embodiment
Next, the cooling structure of the reactor in the second embodiment of the present application will be described based on FIGS. 7 and 8.
FIG. 7 is a longitudinal sectional view of a reactor cooling structure according to a second embodiment. FIG. 8 is a perspective view of the storage portion of the reactor according to the second embodiment, FIG. 8 (a) is a perspective view of the storage portion 5 of the reactor 1, and FIG. 8 (b) is an exploded perspective view of the storage portion 5. The same reference numerals are used for the same or corresponding parts as in FIG. 1 to FIG.
The cooling structure of the reactor in the second embodiment is a modification of the first embodiment, and in that the first storage portion 51 and the second storage portion 52 of the storage portion 5 are integrally formed. Different from 1. The other matters are the same as in the first embodiment, and thus detailed description will be omitted.

図７および図８において、収納部５は第１の収納部５１を形成する内壁５１４と第２の収納部５２を形成する外壁５２４とが一体で構成されている。
また、内壁５１４にはコイル２１、２２の軸線方向と同じ方向の面に４カ所の溝５１５が形成されている。コア部４とコイル部２の間に形成された筒部１０１１から１０１４と、筒部１０１１から１０１４の両端にフランジ１０１５、１０１６を備えた筒状部１０は実施の形態１と同じである。 In FIGS. 7 and 8, the storage unit 5 is integrally configured with an inner wall 514 forming the first storage unit 51 and an outer wall 524 forming the second storage unit 52.
In the inner wall 514, four grooves 515 are formed in the surface in the same direction as the axial direction of the coils 21 and 22. The cylindrical portions 1011 to 1014 formed between the core portion 4 and the coil portion 2 and the cylindrical portion 10 provided with the flanges 1015 and 1016 at both ends of the cylindrical portions 1011 to 1014 are the same as the first embodiment.

内壁５１４の溝５１５に、筒状部１０の筒部１０１１から１０１４が嵌合して、筒状部１０の位置を正確に決める。この際に実施の形態１と同様に、フランジ１０１５の内側面に設けられた突起状の第１の嵌合部１０１７、１０１８、１０１９、１０２０およびフランジ１０１６の内側面に設けられた突起状の第１の嵌合部１０２１、１０２２、１０２３、１０２４が、内壁５１４に設けられた切欠き状の第２の嵌合部１１１１、１１１２、１１１３、１１１４、１１１５、１１１６に嵌合すると、筒状部１０と内壁５１４の位置が正確に組み合わされて、図８（ａ）の状態となる。 The cylindrical portions 1011 to 1014 of the cylindrical portion 10 are fitted in the grooves 515 of the inner wall 514, and the position of the cylindrical portion 10 is accurately determined. At this time, as in the first embodiment, the projecting first fitting portions 1017, 1018, 1019, 1020 provided on the inner side surface of the flange 1015 and the projecting first engaging portions provided on the inner side surface of the flange 1016. When the first fitting portion 1021, 1022, 1023, 1024 is fitted to the notch-shaped second fitting portions 1111, 1112, 1113, 1114, 1115, 1116 provided on the inner wall 514, the cylindrical portion 10 is obtained. And the position of the inner wall 514 are correctly combined, resulting in the state of FIG. 8 (a).

収納部５の内壁５１４と筒状部１０の固定は、第１の嵌合部と第２の嵌合部との間に形成される隙間を、例えば接着剤により埋めて固着されている。換言すると第１の収納部５１と第２の収納部５２とを互いに組み立てることなく形成することが出来る。
このようにすることで、部品点数を削減すると共に実施の形態１と同様にリアクトル１の冷却効率の低下を抑制することが出来る。 The inner wall 514 of the storage portion 5 and the cylindrical portion 10 are fixed by filling the gap formed between the first fitting portion and the second fitting portion with, for example, an adhesive. In other words, the first storage portion 51 and the second storage portion 52 can be formed without being assembled to each other.
By doing so, it is possible to reduce the number of parts and to suppress the decrease in the cooling efficiency of the reactor 1 as in the first embodiment.

実施の形態３．
次に、本願の実施の形態３におけるリアクトルの冷却構造を図９に基づいて説明する。
図９は、実施の形態３に係るリアクトルの冷却構造を示す縦断面図である。なお、図１から図５と同じ又は相当部分については同一の符号を用いて説明を省略する。
実施の形態３におけるリアクトルの冷却構造は、実施の形態１の変形例であって、収納部５の天面部に放熱板と放熱部材を形成している点が実施の形態１と異なる。なお、その他の事項については、実施の形態１と同様であるので、詳細な説明は省略する。 Third Embodiment
Next, the cooling structure of the reactor in Embodiment 3 of the present application will be described based on FIG.
FIG. 9 is a longitudinal sectional view showing a cooling structure of a reactor according to a third embodiment. The same reference numerals are used for the same or corresponding parts as in FIG. 1 to FIG.
The cooling structure of the reactor in the third embodiment is a modification of the first embodiment, and differs from the first embodiment in that a heat sink and a heat radiating member are formed on the top surface portion of the storage portion 5. The other matters are the same as in the first embodiment, and thus detailed description will be omitted.

図９に示すように、放熱板１３は収納部５の天面部５２３を覆うように収納部５の外周に沿って天面部５２３と均一な距離を保って設けられている。放熱板１３は冷却器７にボルト（図示省略）などで固定されている。収納部５の天面部５２３と放熱板１３との間には放熱部材１４が設けられている。このような構成により収納部５から放熱部材１４と放熱板１３とを介して冷却器７に至る放熱経路を構成することができる。 As shown in FIG. 9, the heat sink 13 is provided along the outer periphery of the storage unit 5 to maintain a uniform distance from the top surface 523 so as to cover the top surface 523 of the storage unit 5. The heat sink 13 is fixed to the cooler 7 with a bolt (not shown) or the like. A heat dissipation member 14 is provided between the top surface portion 523 of the storage portion 5 and the heat dissipation plate 13. With such a configuration, it is possible to configure a heat radiation path from the storage unit 5 to the cooler 7 through the heat radiation member 14 and the heat radiation plate 13.

また、放熱板１３は収納部５と一体化して形成しても良い。その際、放熱部材１４は不要となる。
このようにすることで、リアクトル１の実装側となる実装面５１１、５２１から放熱部材８を介して冷却器７に至る放熱経路と合わせてリアクトル１を放熱できるので、リアクトル１の冷却効率を向上させて小型化できると共に実施の形態１と同様にリアクトル１の冷却効率の低下を抑制することが出来る。 In addition, the heat sink 13 may be formed integrally with the housing portion 5. At this time, the heat dissipation member 14 is not necessary.
In this way, the reactor 1 can dissipate heat along with the heat dissipation path from the mounting surfaces 511 and 521 on the mounting side of the reactor 1 to the cooler 7 via the heat dissipation member 8, so the cooling efficiency of the reactor 1 is improved As well as the first embodiment, the reduction of the cooling efficiency of the reactor 1 can be suppressed.

本開示は、様々な例示的な実施の形態及び実施例が記載されているが、１つ、または複数の実施の形態に記載された様々な特徴、態様、及び機能は特定の実施の形態の適用に限られるのではなく、単独で、または様々な組み合わせで実施の形態に適用可能である。
従って、例示されていない無数の変形例が、本願に開示される技術の範囲内において想定される。例えば、少なくとも１つの構成要素を変形する場合、追加する場合または省略する場合、さらには、少なくとも１つの構成要素を抽出し、他の実施の形態の構成要素と組み合わせる場合が含まれるものとする。 While this disclosure describes various exemplary embodiments and examples, the various features, aspects, and features described in one or more embodiments are of particular embodiments. The invention is not limited to the application, and can be applied to the embodiment alone or in various combinations.
Accordingly, numerous modifications not illustrated are contemplated within the scope of the technology disclosed herein. For example, when deforming at least one component, adding or omitting it, it is further included that at least one component is extracted and combined with a component of another embodiment.

１：リアクトル、２：コイル部、２１、２２：コイル、２１１、２２１：引出線、
２１３、２１４：コイルの冷却器側となる面、４：コア部、４１、４２：分割コア、
４１１、４２１：コアの冷却器側となる面、５：収納部、５１：第１の収納部、
５２：第２の収納部、５１１、５２１：リアクトルの実装面、
５１２、５２２：導通口、５１４：内壁、５２４：外壁、５１５：溝、
６：封止放熱樹脂、７：冷却器、７１、７２、７３：冷却面、８：放熱部材、
９：空間、１０：筒状部、１１：箱状部、１０１：第１の筒状部、
１０２：第２の筒状部、１０１１から１０１４：筒部、
１０１５、１０１６：フランジ、１０１７から１０２４：第１の嵌合部、
１１１１から１１１６：第２の嵌合部、１２：スペーサ、１２１：筒状部、
１２２：リブ、１３：放熱板、１４：放熱部材、１０００：電力変換装置。 1: Reactor, 2: Coil section 21, 22: Coil, 211, 221: Lead wire,
213, 214: The surface on the coil side of the coil, 4: Core, 41, 42: Split core,
411, 421: The surface on the cooler side of the core, 5: storage section, 51: first storage section,
52: second housing portion, 511, 521: mounting surface of reactor,
512, 522: conduction port, 514: inner wall, 524: outer wall, 515: groove,
6: Sealing heat dissipation resin, 7: Cooler, 71, 72, 73: Cooling surface, 8: Heat dissipation member,
9: Space, 10: Tubular part, 11: Box-like part, 101: First tubular part,
102: second tubular portion, 1011 to 1014: tubular portion,
1015, 1016: flange, 1017 to 1024: first fitting portion,
1111 to 1116: second fitting portion, 12: spacer, 121: tubular portion,
122: rib, 13: heat sink, 14: heat radiating member, 1000: power converter.

Claims

Cooling of a reactor comprising a core of a magnetic body, a coil wound around the core, a housing part covering the core and the outer periphery of the coil, and a cooler fixed to the housing part via fixing means In the structure
The storage portion has a top surface portion covering the upper side of the core and the coil, an outer wall covering the side of the core and the coil, and an inner wall formed inside the outer wall, and the side of the coil And a second storage unit surrounded by the outer wall covering the side of the core, the first storage unit and the second storage A sealing heat dissipating resin filled up to the end face of the inner wall and the outer wall is provided in the space of the part, and the end face of the inner wall is formed to project toward the cooler than the end face of the outer wall When installed in a cooler, a surface on the cooler side of the core and the coil is held along the cooling surface of the cooler via the sealing heat dissipation resin Cooling structure.

The reactor cooling structure according to claim 1, wherein the hardness of the sealing heat-radiating resin is lower than the hardness of the resin forming the housing portion.

The end surface of the inner wall is formed to project more than the surface on the cooler side of the coil, and the end surface of the outer wall is formed to project more than the surface on the cooler side of the core. The cooling structure of the reactor according to claim 1 or 2.

Between the thickness of the sealing heat dissipation resin interposed between the surface of the coil on the cooler side and the cooling surface of the cooler, and between the surface on the cooler side of the core and the cooling surface of the cooler The reactor cooling structure according to any one of claims 1 to 3, wherein a thickness of the sealing and radiating resin interposed therebetween is constant.

Between the thickness of the sealing heat dissipation resin interposed between the surface of the coil on the cooler side and the cooling surface of the cooler, and between the surface on the cooler side of the core and the cooling surface of the cooler The reactor cooling structure according to any one of claims 1 to 4, wherein a thickness of the sealing and radiating resin interposed therebetween is smaller than a thickness of the inner wall.

The heat radiating member was provided between the surface which becomes the cooler side of said 1st accommodating part and said 2nd accommodating part, and the cooling surface of the said cooler, The any one of the Claims 1-5 characterized by the above-mentioned. Reactor cooling structure according to any one of the preceding claims.

The reactor according to claim 6, wherein both or any one of the first storage portion and the second storage portion is formed of a resin having a thermal conductivity higher than that of the heat dissipation member. Cooling structure.

The upper surface portion covering the upper side of the coil is fixed to the end surface of the inner wall to constitute the first storage portion, and the upper surface portion covering the upper side of the core is fixed to the end surface of the outer wall The top surface part which comprises the storage part of 2, and covers the upper direction of the said core was made lower than the said top surface part which covers the upper direction of the said coil, The any one of the Claims 1-7 characterized by the above-mentioned. Reactor cooling structure.

The thickness of the said sealing heat radiation resin with which the space of the said 1st accommodating part and the said 2nd accommodating part was filled is smaller than the thickness of the said inner wall, The any one of the Claims 1-8 characterized by the above-mentioned. The reactor cooling structure according to item 1.

The reactor cooling structure according to any one of claims 1 to 9, wherein the first housing portion and the second housing portion are configured separately from each other.

The reactor cooling structure according to any one of claims 1 to 10, wherein the first housing portion and the second housing portion are integrally formed.

The first storage portion is characterized by comprising a cylindrical portion for holding the coil and a box-shaped portion which is inserted into the cylindrical portion and holds the core. The reactor cooling structure according to any one of claims 11 to 12.

The cylindrical portion of the first storage portion has a first cylindrical portion and a second cylindrical portion divided in the axial direction of the cylindrical portion, and the first cylindrical portion and the first cylindrical portion 13. The reactor cooling structure according to claim 12, wherein the second cylindrical portion includes a flange that extends in the radial direction of the cylindrical portion.

A projecting fitting portion is provided on the inner side surface of the flange of the first tubular portion and the second tubular portion, and the fitting portion is provided on the side surface of the box-like portion facing the fitting portion. The reactor cooling structure according to claim 13, characterized in that a hole-shaped fitting portion to be fitted is provided.

The reactor cooling structure according to any one of claims 1 to 14, wherein a conduction port of the coil is provided in the top surface portion of the first storage portion and the second storage portion. .

The reactor cooling structure according to claim 13, wherein a spacer forming an air gap between the cores is provided inside the first cylindrical portion or the second cylindrical portion.

The cooling of the reactor according to any one of claims 1 to 14, wherein a heat dissipation plate is provided on a top surface portion of the storage portion, and heat is dissipated from the heat dissipation plate to the cooler. Construction.

The power converter device provided with the cooling structure of the reactor of any one of Claims 1-17.