JP2006319312A - Reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reactor whose products of distinct specifications can be easily manufactured, while the reactor being small and excellent in a heat dissipation property. <P>SOLUTION: There are provided a pair of inside cores 2 each having a straight stem. The inside core 2 is inserted into a wound coil 3. A case 1 having gap portions 1a each penetrated with a straight stem along a periphery of the coil 3 is formed by an extrusion material of aluminum. The inside core 2 and the coil 3 are inserted in the gap portions 1a, and an attachment cover 6 accommodating an outside core 5 is furnished on both side surfaces of the inside core 2 and the coil 3 through an insulating panel P. The gap portions 1a are filled up with a resin R so that a head of a terminal 4 may be exposed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to, for example, an iron core type reactor, and more particularly to an improvement of a reactor in which a coil and an inner core are resin-sealed.

  Reactors that are connected to electric circuits and use inductive reactance are widely used, and various structures have been proposed. Such a reactor basically includes a magnetic core (core) and a coil. For example, when a structure in which these are accommodated in a case is adopted, electrical insulation between the case and the coil and improvement in mechanical strength can be achieved. For this reason, filling the inside with a resin such as epoxy has been performed.

As such a reactor in which a core and a coil are housed in a case and filled with a resin, those shown in Patent Documents 1 and 2 are disclosed.
JP 2004-259794 A JP 05-109542 A

  By the way, reducing the loss of the reactor is a problem that has been conventionally required, and this is also pointed out in Patent Documents 1 and 2. Therefore, it is very important to enhance the heat dissipation effect in designing the reactor. Filling the case with resin also increases the thermal conductivity of the coil and increases the heat dissipation. However, the reactor filled with resin in the case as described above generally has a structure in which a coil is wound around an annular core (see Patent Documents 1 and 2). , It is not discharged efficiently outside the case. Although it is conceivable to devise the spacing of the windings and the shape of the case in the coil, it is easy to increase the size as a whole. In particular, when an annular core is used, when trying to manufacture a product with different specifications, the size of the core must be changed, and it is inevitably necessary to manufacture a case with a different shape and a mold for it. There is.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and the object of the present invention is to provide a reactor that is small in size and excellent in heat dissipation characteristics, and that can easily manufacture products having different specifications. Is to provide.

  In order to achieve the above object, the invention of claim 1 is a reactor having a magnetic core part and a coil, wherein the magnetic core part has a pair of middle cores whose axes are linearly formed, The middle core is inserted into the wound coil, and includes a case having a gap portion that is formed in a shape along the outer periphery of the coil and is penetrated by a linear shaft. It is inserted into the gap and filled with resin.

  In the invention of claim 1 as described above, the inner core of the linear shaft is inserted into the space between the linear shaft and the linear shaft, and the space is shaped along the outer periphery of the coil. The distance between the case and the case can be reduced, the thermal resistance can be reduced, and the amount of resin to be filled between the coil and the case can be reduced.

  According to a second aspect of the present invention, in the reactor having a magnetic core portion and a coil, the magnetic core portion has a pair of middle cores having axes formed linearly, and the middle core is wound. A case having a gap portion inserted into a coil and extending along a linear axis in a shape along the outer periphery of the coil, wherein the middle core and the coil are inserted into the gap portion. And

  In the invention of claim 2 as described above, the inner core of the linear shaft is inserted into the space between the linear shaft and the linear shaft, and the space is shaped along the outer periphery of the coil. The distance between the case and the case is reduced, and the thermal resistance can be reduced.

According to a third aspect of the present invention, in the reactor according to the second aspect, the gap is filled with a resin.
In the invention of claim 3 as described above, the inner core of the linear shaft is inserted into the space between the linear shaft and the linear shaft, and the space is shaped along the outer periphery of the coil. The amount of resin to be filled between the case and the case can be reduced.

According to a fourth aspect of the present invention, in the reactor according to the second or third aspect, the case is divided into a plurality of cases.
In the invention of claim 4 as described above, since the case accommodating the coil is divided into a plurality of parts, the heat dissipation effect is enhanced, and the terminals from the coil can be drawn between the divided cases. The degree of freedom of the drawer position increases.

According to a fifth aspect of the present invention, in the reactor according to any one of the first to fourth aspects, the case is formed of an extruded material.
In the invention of claim 5 as described above, when the number of turns of the coil and the axial length of the inner core are changed, the size of the case can be adjusted only by adjusting the cutting length of the extruded material. Compared with mold material, it can easily cope with different specifications.

A sixth aspect of the present invention is the reactor according to any one of the first to fifth aspects, wherein the magnetic core portion has an outer core disposed on an outer surface of the case.
In the invention of claim 6 as described above, since the outer core exists outside the case, the case itself can be reduced in size and the gap portion can be kept small, so that the amount of resin used can be reduced.

The invention according to claim 7 is the reactor according to any one of claims 1 to 6, wherein an insulating film is provided between the coil and the gap.
In the invention of claim 7 as described above, since the insulation between the coil and the case is ensured by a thin insulating film instead of inserting a spacer or the like, the distance between the coil and the case can be made very small. , Heat resistance and resin usage can be greatly reduced.

The invention according to claim 8 is the reactor according to any one of claims 1 to 7, wherein the coil has a pair of axes provided in parallel and adjacent to each other so that the middle core can be inserted respectively. It is characterized by being wound in a cylindrical shape.
In the invention of claim 8 as described above, it is not necessary to process the coil so as to follow the core shape, and it is only necessary to insert the middle core into the cylindrical coil, so that the assembling work becomes very simple. .

A ninth aspect of the present invention is the reactor according to any one of the first to eighth aspects, wherein a radiating fin is formed integrally with the outer surface of the case.
In the invention of claim 9 as described above, since the heat radiating fins are formed in the case itself, the heat radiating effect is further enhanced, and the time and effort of assembling is not required as compared with the case where another part for heat radiating is prepared.

The invention of claim 10 is characterized in that, in the reactor according to any one of claims 1 to 9, an attachment member that supports the case is provided separately from the case together with the outer core. To do.
In the invention of claim 10 as described above, since the attachment member is separate from the case, deformation of the case can be reduced when attaching to the attachment surface.

The invention according to claim 11 is the reactor according to any one of claims 1 to 10, wherein the attachment member is provided so as to be supported regardless of the direction of the case.
In the invention of claim 11 as described above, it is possible to reduce the mounting area by changing the mounting direction of the case.

According to a twelfth aspect of the present invention, in the reactor according to any one of the first to eleventh aspects, an end of the coil is directly connected to a terminal that is partially exposed from the resin.
In the invention of claim 12 as described above, since the end of the coil is directly connected to the terminal, the resistance can be reduced.

A thirteenth aspect of the present invention is the reactor according to any one of the first to twelfth aspects, wherein the coils corresponding to the pair of middle cores are wound in opposite directions.
In the invention of the thirteenth aspect as described above, since the winding direction is opposite to the left and right, if the parallel connection is used, no potential difference is generated between the pair of coils, and insulation between the coils is not necessary.

A fourteenth aspect of the present invention is the reactor according to any one of the first to thirteenth aspects, wherein a gap is provided between the coil and the middle core by a plurality of tapes parallel to the axis of the middle core. It is characterized by being.
In the invention of claim 14 as described above, since the resin directly touches the middle core by the gap between the coil and the middle core, the middle core can be easily cooled.

According to a fifteenth aspect of the present invention, in the reactor according to any one of the first to fifteenth aspects, the case is made of aluminum, and at least an inner surface of the gap in the case is subjected to an alumite treatment. It is characterized by that.
In the invention of the fifteenth aspect as described above, auxiliary insulation can be performed by alumite treatment, and since it is an oxide film, it is an inorganic substance, which is preferable from the viewpoint of thermal resistance and reliability.

  As described above, according to the present invention, it is possible to provide a reactor that is small in size and excellent in heat dissipation characteristics and that can easily manufacture products having different specifications.

Next, embodiments of the present invention (hereinafter referred to as embodiments) will be specifically described with reference to the drawings.
[First Embodiment]
[overall structure]
First, the overall configuration of the first embodiment will be described with reference to FIG. That is, in this embodiment, a pair of middle core 2 and coil 3 are accommodated in the case 1, and the attachment cover 6 fitted with the outer core 5 is attached via the insulating plate P and then connected to the end of the coil 3. Filled with resin R so that the terminal 4 is exposed.

[Medium core and coil]
Next, the middle core 2 and the coil 3 will be described. As shown in FIG. 2, the middle core 2 is formed by laminating a large number of disk-shaped core materials coaxially through insulating spacers 2a (gap materials) and fixing them with a linear tape 2b. For this reason, the middle core 2 has a substantially cylindrical shape with a linear axis as a whole.

  On the other hand, the coil 3 has a so-called edgewise (vertical winding) configuration in which a rectangular wire covered with polyester is wound in the width direction, as shown in FIGS. 2 and 3A to 3C. The coil 3 is provided in a pair on the left and right so that the axes are substantially parallel to each other, and the middle core 2 is inserted in each pair. The left and right coils 3 are wound in opposite directions, and both ends thereof are connected to the two terminals 4 respectively.

  As shown in FIGS. 3A and 3C, the terminal 4 has a screw formed at its lower end by tapping. In this way, the terminal 4 and the coil 3 are arranged close to each other by taking a shape with a sharpened tip. A rectangular groove 4a is formed on the side surface of the terminal 4, and the end of the bent coil 3 is directly inserted and soldered.

[Case]
As shown in FIG. 4, the coil 3 in which the middle core 2 configured as described above is inserted is inserted into the case 1 via an insulating film 7. The case 1 is manufactured so that the gap portion 1a and the heat radiating fin portion 1b are integrally formed by an aluminum extrusion material. The gap 1a is formed so as to penetrate the case 1 with a linear shaft, and a curved surface along the outer shape of the coil 3 is formed inside. The case 1 is open at the top for heat dissipation and for exposing the terminals 4. Furthermore, an alumite treatment is performed on the inner surface of the case 1 including the gap 1a.

  On the other hand, the radiating fin portion 1b is constituted by a plurality of convex portions (or grooves) parallel to the penetration direction of the gap portion 1a. As described above, since the gap 1a and the radiating fin 1b are formed in linear directions parallel to each other (the cross section is the same shape), the formation by extrusion is easy. Moreover, the screw hole 1c for attaching the attachment cover 6 and the insulating board P is formed in the both sides | surfaces of the case 1 corresponding to the both ends of the radiation fin part 1b.

  Thus, the coil 3 in which the inner core 2 is inserted is inserted into the gap portion 1a in a state where the outer surface is covered with the insulating film 7 as shown in FIG. 4 (see FIG. 1). The insulating film 7 is formed in a sufficient size so that the coil 3 and the case 1 do not contact each other.

[Insulating plate, outer core and mounting cover]
As shown in FIG. 5, the insulating plate P is a rectangular plate that seals both side surfaces of the case 1 and is made of an insulating material. A mounting hole P1 corresponding to the screw hole 1c of the case 1 is formed in the insulating plate P.

  As shown in FIG. 6, the outer core 5 has a rectangular parallelepiped shape and is mounted in the mounting cover 6. The attachment cover 6 has an accommodating portion 6a bent into a box shape so that the outer core 5 can be accommodated. Further, on the left and right sides of the mounting cover 6, there are provided mounting portions 6 c in which mounting holes 6 b corresponding to the screw holes 1 c of the case 1 are formed. Further, a fixing portion 6e for fixing to an installation surface and having a fixing hole 6d into which a fixing screw is inserted is provided at the lower portion of the mounting portion 6c.

  As shown in FIGS. 1 and 7, the mounting cover 6 that accommodates the outer core 5 is attached to both side surfaces of the case 1 through insulating plates P, and is inserted into the case by screws S1 inserted through the mounting holes 6b and P1. 1 is fixed. As shown in FIG. 1, the inner core 2 and the coil 3 are fixed inside the case 1 by filling the gap 1 a with the resin R so that the head of the terminal 4 is exposed. Further, the case 1 is placed at the installation location, and the case 1 is fixed to the installation surface by the screw S2 inserted into the fixing hole 6d of the fixing portion 6e (see FIG. 1).

[Function and effect]
The operational effects of the present embodiment as described above will be described below.
[Thermal resistance and resin usage]
First, in the present embodiment, the axes of the middle core 2, the coil 3, and the gap portion 1a are linear, and the gap portion 1a is shaped close to the outer periphery of the coil 3. It can transmit efficiently, can reduce thermal resistance, and can reduce the usage amount of resin R filled between the coil 3 and the case 1.

  In particular, since the insulation between the coil 3 and the case 1 is ensured by the insulating film 7 having the minimum necessary thickness, the distance between the coil 3 and the case 1 is much closer than when an insulating spacer is inserted. The thermal resistance is small. Furthermore, since the outer core 5 exists outside the case 1, the case 1 itself can be reduced in size and the gap 1 a can be kept small as compared with the case where all of the outer core 5 is accommodated in the case 1. The amount of resin R used can be reduced.

[Correspondence to different specifications]
Since the case 1 can be formed integrally with the gap portion 1a and the heat radiating fin portion 1b by extrusion of aluminum, manufacturing is facilitated. In particular, in the case of different specifications, it is necessary to change the number of turns of the coil 3 and the length (product number) of the middle core 2, but even in such a case, the case 1 has a cut length of the extruded material. Since the size can be adjusted only by adjusting the thickness, it is not necessary to manufacture a separate mold according to different specifications as compared with the mold, and it can be easily handled.

[Assemblyability]
The middle core 2, the coil 3, and the gap 1a have straight axes, and after the middle core 2 is inserted into the coil 3, the coil 3 only needs to be inserted into the gap 1a, so that the assembly is very easy. It becomes. In particular, since it is not necessary to process the coil 3 so as to follow the shape of the middle core 2, there is no problem even if the cross-sectional area of the wire constituting the coil 3 is large. As an assembly order, the core 3 may be inserted after the coil 3 is inserted into the gap 1a.

[External heat dissipation performance]
Since the heat radiation fin portion 1b is formed on the case 1 itself having a certain thickness, the heat radiation effect is further enhanced. In particular, since it can be formed integrally with the manufacture of the case 1 which is an extruded material, it does not require assembling work as compared with the case where a separate part for heat dissipation is prepared.

[Dimensional accuracy]
Since the mounting cover 6 for mounting the case 1 to the installation surface also serves as mounting of the outer core 5 and is provided separately from the case 1, the mounting cover 6 is deformed even when an external force is applied during mounting. As a result, the influence on the case 1 can be suppressed. In addition, the heat dissipation effect through the insulating plate P and the attachment cover 6 attached to the case 1 is also obtained.

[Connection with terminal]
Since the lower end is sharpened, the end of the coil 3 is bent and directly inserted into the groove 4a of the terminal 4 disposed close to the coil 3, so that the distance between the coil 3 and the terminal 4 is increased. As a result, the area of the contact portion can be ensured and the resistance can be reduced.

[Insulation]
The right and left coils 3 have opposite winding directions, and by connecting them in parallel, no potential difference is generated between the pair of coils 3, so that insulation between the coils 3 becomes unnecessary. In addition, a gap is formed between the coil 3 and the middle core 2 by the plurality of tapes 2b parallel to the axis of the middle core 2, so that loss due to insulation and leakage magnetic flux can be reduced. This is especially because the resin R directly touches the middle core 2 when the resin R enters the gap between the coil 3 and the middle core 2, so that the middle core is compared with the case where insulation is performed using a resin bobbin or film. 2 is easy to cool. Further, since the surface between the case 1 and the coil 3 is anodized, there is an auxiliary insulating effect, which is preferable from the viewpoint of thermal resistance and reliability.

[Second Embodiment]
[Constitution]
Next, a second embodiment of the present invention will be described with reference to FIGS. Note that members similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, the present embodiment basically has the same configuration as that of the first embodiment. However, in this embodiment, as shown in FIG.8 and FIG.9, two cases 11 and 12 are prepared, and the points which each accommodate the coils 31 and 32 differ.

  As shown in FIG. 10, the cases 11 and 12 are extruded materials of aluminum having a rectangular parallelepiped appearance. In the cases 11 and 12, gaps 11a and 12a are formed so as to penetrate through the linear axes, respectively. Since the inside of the gaps 11a and 12a is a curved surface that follows the outer shape of the coils 31 and 32, the cross section is substantially U-shaped. As shown in FIGS. 11 and 12, coils 31 and 32 into which the inner core 2 is inserted are accommodated in the gaps 11 a and 12 a through the insulating film 13, and are fixed with an adhesive. Furthermore, insulating plates 14 are affixed to the surfaces corresponding to both ends of the shafts of the cases 11 and 12, and the gaps 11a and 12a are filled with resin.

  As shown in FIGS. 8 and 9, such cases 11 and 12 are juxtaposed in an upright manner so that the opening surfaces face each other, and the outer cores 5 are arranged above and below. Then, with respect to the mounting cover 15 having the upper and lower horizontal surfaces 15a and 15b and the vertical surface 15c connecting the upper and lower horizontal surfaces 15a and 15b, between the horizontal surfaces 15a and 15b, the cases 11 and 12 in which the outer core 5 is disposed vertically are inserted. It is fixed by doing. Both ends of the coil 3 are extended so as to be drawn upward and connected to the terminal plate 16. The extended portion of the extracted coil 3 is protected by a tube 17 for insulation.

[Function and effect]
The operational effects of the present embodiment as described above are as follows. That is, since the cases 11 and 12 are divided into left and right, the heat dissipation effect is enhanced, and the end of the coil 3 can be pulled out from any position between the cases 11 and 12, and the positions of the terminals can be freely set. The degree increases. For example, in this embodiment, the terminal board 16 is pulled out to the upper part.

  Moreover, compared with case 1 of said 1st Embodiment, since the structure of right and left cases 11 and 12 is simple and small, and the type | mold for manufacturing both is only one, a mold cost becomes cheap. The left and right coils 31 and 32 are free to use two types of mirror windings or the same type of coils.

[Other Embodiments]
The present invention is not limited to the embodiment as described above. For example, as shown in FIG. 13, the shape of the middle core 2 is free, and various shapes such as a non-divided round bar type (A), a divided prismatic type (B), and a non-divided prismatic type (C) are available. Things are applicable. For the formation of the middle core 2 and the outer core 5, either ceramic (sintered ferrite core) system or metal (compact core) system can be adopted, and what is included as the material is also free. It is free to make a laminated core of a plate-like body or a cut core.

  Further, for example, as shown in FIGS. 14 and 15, when a U-shaped continuous core 8 (cut core or so-called UU type core) is used, a cylindrical body 9 is inserted into the coil 3, It is good also as a structure which inserts the core 8 after filling the case 1 with resin. 10 in the figure is a sealing plate. With such a configuration, contact between the resin and the core 8 can be avoided, which is suitable in the case where the core 8 is formed of a material that is resistant to stress caused by the resin. Thus, as the shape of the magnetic core in the present invention, it is sufficient if it includes at least one portion where the axis is a linear inner core, which may be independent on the left and right or may be continuous. . That is, it is not excluded that the number of medium cores and outer cores is singular or more than two.

  Moreover, what kind of winding is adopted as the winding of the coil 3 is also free. For example, as shown in FIG. 16, it may be a round line (A) instead of a flat angle, or a litz line (B) knitted with a fine line. The winding shape of the coil 3 may be a rectangular shape as shown in FIG. In accordance with this, it is conceivable that the gap 1a is also rectangular. The left and right coils 3 may be connected in series.

  Further, the shape and size of the case 1 are not limited to those shown in the above embodiment. For example, in the first embodiment, the presence of the radiating fin portion 1b can increase the surface area and increase the heat radiating effect and reduce the amount of aluminum used, but does not form the radiating fin portion 1b. It is also possible to do. In the second embodiment, the cases 11 and 12 may be provided with heat radiating fin portions. Further, the installation direction of the case 1 can also be reduced by setting it vertically as shown in FIG. The size of the upper opening and the size of the gap 1a can be freely designed according to the coil 3 to be accommodated and the terminal 4 to be fixed. As for the material of the case 1, aluminum is suitable, but it may be formed of other materials.

  Further, as shown in FIG. 19, the case 1 itself may be formed integrally with a large radiator X for cooling other components, and the above-described necessary components may be assembled and filled with resin. . If it is set as this structure, it will become a reactor with the more excellent heat dissipation effect. On the other hand, in the second embodiment, the case is divided into a plurality of parts, but the number and manner of the divisions are also free.

  Moreover, what kind of resin is used as the filling resin is also free. Any resin that can be used at present or in the future, such as epoxy, polyimide, and silicone, can be applied, and other materials can be freely added to improve the properties. In addition, regarding the filling with resin, if there is a material (for example, an insulating sheet) that efficiently conducts the heat of the coil, it is not possible to fill it. Further, the present invention does not exclude the application to any static induction electric machine having a magnetic core and a coil.

It is a perspective view which shows the whole structure of the 1st Embodiment of this invention, the upper part is a disassembled perspective view, and the lower part is the perspective view after an assembly. It is a perspective view which shows the middle core and coil in embodiment of FIG. It is the rear view (A), top view (B), and front view (C) which show the coil in embodiment of FIG. It is a perspective view which shows insertion of the coil in the case in embodiment of FIG. It is a perspective view which shows the resin filling state to the case in embodiment of FIG. It is a perspective view which shows the outer core and attachment cover in embodiment of FIG. It is a perspective view which shows attachment of the attachment cover in embodiment of FIG. It is a disassembled perspective view which shows the whole structure of the 2nd Embodiment of this invention. It is the whole perspective view after the assembly in embodiment of FIG. It is a perspective view which shows insertion of the coil in the case in embodiment of FIG. It is a perspective view which shows the insulating board affixed on the case in embodiment of FIG. It is a perspective view which shows the case in which the coil in embodiment of FIG. 8 was accommodated. It is a perspective view which shows the inside core in other embodiment of this invention, and shows a round bar type | mold (A), the divided | segmented prismatic type (B), and a non-divided prismatic type | mold (C). It is a disassembled perspective view which shows other embodiment of this invention. It is a disassembled perspective view which shows other embodiment of this invention. It is a perspective view which shows the coil in other embodiment of this invention, and shows a round wire (A) and a litz wire (B). It is a perspective view which shows the coil and case in other embodiment of this invention. It is a perspective view which shows embodiment which made the case vertical. It is a perspective view which shows embodiment which formed the case integrally with the heat radiator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 12 ... Case 1a, 11a, 12a ... Air gap part 1b ... Radiation fin part 1c ... Screw hole 2 ... Core 2a ... Insulating spacer 2b ... Tape 3, 31, 32 ... Coil 4 ... Terminal 4a ... Groove 5 ... Outer core 6 ... mounting cover 6a ... accommodating portion 6b, P1 ... mounting hole 6c ... mounting portion 6d ... fixing hole 6e ... fixing portion 7 ... insulating film 8 ... core 9 ... cylindrical body 10 ... sealing plate 15 ... mounting cover 15a , 15b ... Horizontal surface 15c ... Vertical surface 16 ... Terminal board 17 ... Tube R ... Resin S1, S2 ... Screw X ... Radiator

Claims (15)

In a reactor having a magnetic core and a coil,
The magnetic core portion has a pair of middle cores whose axes are linearly formed,
The middle core is inserted into the wound coil;
In a shape along the outer periphery of the coil, comprising a case having a gap portion penetrated by a linear shaft,
The reactor, wherein the middle core and the coil are inserted into the gap and filled with resin. In a reactor having a magnetic core and a coil,
The magnetic core portion has a pair of middle cores whose axes are linearly formed,
The middle core is inserted into the wound coil;
In a shape along the outer periphery of the coil, comprising a case having a gap portion penetrated by a linear shaft,
The reactor, wherein the middle core and the coil are inserted into the gap.   The reactor according to claim 2, wherein the gap is filled with a resin.   The reactor according to claim 2, wherein the case is divided into a plurality of cases.   The reactor according to any one of claims 1 to 4, wherein the case is formed of an extruded material.   The reactor according to claim 1, wherein the magnetic core portion has an outer core disposed on an outer side surface of the case.   The reactor according to claim 1, wherein an insulating film is provided between the coil and the gap.   8. The coil according to claim 1, wherein the coil is wound into a pair of cylinders provided in parallel and adjacent to each other so that the inner cores can be inserted respectively. The reactor according to item 1.   The reactor according to any one of claims 1 to 8, wherein a radiation fin is formed integrally with an outer surface of the case.   The reactor according to any one of claims 1 to 9, wherein an attachment member that supports the case together with the outer core is provided separately from the case.   The reactor according to claim 1, wherein the attachment member is provided so as to be supported regardless of the direction of the case.   The reactor according to any one of claims 1 to 11, wherein an end of the coil is directly connected to a terminal part of which is exposed from the resin.   The reactor according to any one of claims 1 to 12, wherein coils corresponding to the pair of middle cores are wound in opposite directions to each other.   The reactor according to any one of claims 1 to 13, wherein a gap is provided between the coil and the middle core by a plurality of tapes parallel to the axis of the middle core. The case is made of aluminum;
The reactor according to any one of claims 1 to 14, wherein an alumite treatment is applied to at least an inner side surface of the gap in the case.

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