JP2010034228A - Reactor - Google Patents

Reactor Download PDF

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Publication number
JP2010034228A
JP2010034228A JP2008193821A JP2008193821A JP2010034228A JP 2010034228 A JP2010034228 A JP 2010034228A JP 2008193821 A JP2008193821 A JP 2008193821A JP 2008193821 A JP2008193821 A JP 2008193821A JP 2010034228 A JP2010034228 A JP 2010034228A
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Japan
Prior art keywords
case
reactor
resin
coil
convex
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Pending
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JP2008193821A
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Japanese (ja)
Inventor
Takuji Kozu
卓司 神頭
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Sumitomo Electric Ind Ltd
住友電気工業株式会社
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Priority to JP2008193821A priority Critical patent/JP2010034228A/en
Publication of JP2010034228A publication Critical patent/JP2010034228A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reactor which has superior adhesiveness between a resin charged in a case and the case. <P>SOLUTION: The reactor 1 includes an assembly 1A having a coil 11 and an annular magnetic core 10 where the coil 11 is disposed, and a case 12A which stores the assembly 1A. The resin 13 is charged between the case 12A and assembly 1A. The case 12A is a box-shaped body which includes a bottom surface 12b and sidewalls 12s raised from the bottom surface 12b and includes an opening, and includes uneven portions 12c, coming into contact with the resin 13, on inner peripheral surfaces of the sidewalls 12s. The uneven portions 12c increase the area of contact between the case 12A and resin 13 to enhance the adhesiveness between the case 12A and resin 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reactor used for a component part of a power conversion device such as an in-vehicle DC-DC converter mounted in a hybrid vehicle or the like. In particular, the present invention relates to a reactor having excellent adhesion between a resin filled in the case and the case.

  There is a converter that performs voltage step-up / step-down operation as a vehicle-mounted component such as a hybrid vehicle or an electric vehicle that uses a motor as a drive source or a power generation source during regeneration.

  A converter usually includes a reactor that smoothes an alternating current generated by an ON / OFF switching operation. FIG. 5 shows a typical reactor L. The reactor L includes a combined body including a magnetic core 100 made of a magnetic material and a coil 110 disposed on the core 100, and a case 120 that houses the combined body. The combined body is sealed with the resin 130 filled in the case 120 (FIG. 3 of Patent Document 1). A band-shaped stay member 140 is disposed on the end core 100e where the coil 110 is not disposed in the magnetic core 100, and the stay member 140 is fixed to the case 120 by the bolt 141, so that the assembly is formed by the stay member 140. Pressed against the bottom side of 120. The case 120 is attached to a cooling base (not shown) so that the coil and the core that generate heat when energized can be efficiently cooled.

  The reactor is sometimes used in a state where a lid is attached to the opening of the case, but is usually opened without the lid (FIG. 1 of Patent Document 2).

JP 2007-116066 JP 2008-028290 A

  By attaching the lid and the stay member to the case as described above, it is possible to prevent the assembly from dropping from the case. However, an attachment work such as a lid is required and the number of parts increases. On the other hand, in order to omit the mounting operation and reduce the number of parts, it is conceivable to omit the lid and fix the assembly to the case with a resin filled in the case. However, aluminum, which is a typical constituent material of the case, and the resin filled in the case have different thermal expansion coefficients. Therefore, when the reactor is used, if the resin and the case are repeatedly heated by heat from the coil generated by energization and cooling by the cooling base, the resin cannot follow the deformation of the case, and the resin cracks. If the crack reaches the bottom surface of the case, the assembly may fall out of the case together with the resin. In particular, the reactor may be attached to the cooling base so that the opening side of the case faces downward, and in this case, the possibility of dropping is further increased. Therefore, it is desired to improve the adhesion between the resin and the case.

  Then, the objective of this invention is providing the reactor excellent in the adhesiveness of resin with which a case is filled, and a case.

  This invention achieves the said objective by setting it as the structure with a large contact area of resin and a case. Specifically, the reactor of the present invention includes an assembly including a coil and an annular magnetic core on which the coil is disposed, and a case that houses the combination, and further, between the case and the assembly. Contains resin to be filled. The case is an open box-like body having a bottom surface and side walls standing from the bottom surface. And at least one of the recessed part and convex part which contact the said resin is formed in the internal peripheral surface of the side wall of a case.

  Since the inner peripheral surface of the case provided in the conventional reactor is a smooth surface without unevenness, the contact area with the resin is substantially equal to the area of the inner peripheral surface. On the other hand, the reactor of the present invention is configured to include at least one of a concave portion and a convex portion that contact the resin on the inner peripheral surface of the case, in particular, the inner peripheral surface of the side wall. Can increase more effectively than the reactor case. Therefore, it is expected that the adhesion between the resin and the case can be improved, and even if the resin is cracked, it is possible to reduce the combination from dropping together with the resin from the case. Further, according to the configuration of the present invention, since the concave portion and the convex portion are provided, the stay member can be omitted, or the stay member can be downsized, and the fixing member such as a bolt for fixing the stay member can be downsized. It is expected.

  In the reactor of the present invention, the magnetic core includes a pair of coil winding portions and a pair of end cores arranged so as to sandwich the coil winding portions, and is configured in an annular shape by combining them. Is mentioned.

  In the reactor of the present invention, the resin filled in the case is preferably excellent in electrical insulation, thermal conductivity, impact resistance, and sound absorption, and examples thereof include urethane resin, epoxy resin, and silicone resin. Moreover, the resin conventionally utilized as a potting resin can be utilized.

  In the present invention, it is preferable that the case is made of a metal, particularly aluminum or an aluminum alloy, because it is excellent in strength, lightweight, and excellent in heat dissipation. Further, the case may be a box-shaped body integrally formed by casting, sintering, press working, or the like, or may be a form in which a plurality of divided pieces are combined into a single box-shaped body. When the case is a combination of divided pieces, it is preferable that the case be integrated using welding or a connecting member.

  It is sufficient that at least one of the concave portion and the convex portion is present on the side wall of the case. However, if there is a concave and convex portion where both the concave portion and the convex portion are formed, the contact area can be increased more effectively, and the resin and the case The adhesion between the two can be improved. For example, a concavo-convex shape configured by arranging a plurality of ridges that are continuous in a straight line or a curved shape, and a concavo-convex shape configured by discontinuously dispersing a plurality of short convex portions.

  The above irregularities may be formed by separately producing ridges and small pieces to be convex portions and attaching them to the case side wall by welding or adhesive, etc. It is unnecessary. When the case is integrally provided with unevenness, the formation of the unevenness may be performed at the same time as the case is manufactured or after the case is manufactured. When forming irregularities at the time of manufacturing the case, for example, performing sand mold casting, using a casting mold with a surface that contacts the molten metal with a scissors or using an irregularly shaped casting mold Can be mentioned. When the sand mold is used, a case having unevenness can be easily manufactured regardless of the arrangement state and shape of the unevenness. On the other hand, when using the above-mentioned roughened mold or uneven-shaped mold, it may be difficult to extract the casting from the mold depending on the arrangement and shape of the unevenness. In this case, the case may be a combination of divided pieces. In order to form the unevenness after the case is manufactured, for example, shot blasting, cutting, or polishing treatment (roughening treatment) for roughening the surface using scissors can be used. Even when only one convex portion or concave portion is provided, the above-described method for forming the concave and convex portions can be used as appropriate.

  The said convex part, a recessed part, or an unevenness | corrugation should just exist in at least one part of a side wall, may exist over the whole surface of a side wall, and may exist in the bottom face of a case in addition to a side wall. The position of the convex portion, concave portion, or unevenness on the side wall is not particularly limited, but if there is a convex portion on the opening side of the case, the opening portion can be made small by this convex portion, and thus it is easy to contribute to prevention of falling off. It is expected. In particular, when a convex piece projecting inward from the opening of the case is provided, the convex piece is caught when the assembly is about to fall out of the case, thereby preventing the dropout.

  The convex piece may be configured integrally with the case, or may be configured such that a separately produced convex piece is attached to the case with a bolt or the like. In the former case, fixing members such as bolts are unnecessary, and the number of parts is small. In the latter case, when the assembly is inserted into the case, there is no convex piece arranged so as to cover a part of the opening of the case, so that the assembly is easily housed in the case.

  Also, when forming a case with a convex piece integrally formed in the opening of a box-shaped body, sand casting is possible, but it is difficult to extract the case (casting) from this mold when using a normal casting mold. . Therefore, in this case, the case may be a combination of divided pieces as described above. In particular, by forming the split pieces so that the joints are present on the convex pieces, that is, by dividing the convex pieces, the split pieces can be easily manufactured even with a casting mold, and the productivity of the split pieces is excellent. . The joint location may exist in the middle of the convex piece, or the split piece may be configured such that the boundary with the convex piece becomes the joint location.

  The reactor of the present invention has a large contact area between the resin that seals the combination of the magnetic core and the coil, and the case in which the combination is housed and filled with the resin, and has excellent adhesion between the resin and the case. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 (A) is a schematic perspective view of an assembly of a magnetic core and a coil included in the reactor of the present invention, and (B) is a partial cross-sectional view schematically showing the reactor of the present invention. Hereinafter, the same reference numerals in the drawings indicate the same names.

  The reactor 1 includes a combined body 1A including an annular magnetic core 10 and a coil 11 disposed in a coil winding portion 10c of the magnetic core 10, and a case 12A that stores the combined body 1A. The case 12A is filled with the resin 13, and the resin 13 exists between the inner peripheral surface of the case 12A and the outer peripheral surface of the combined body 1A. The feature of the reactor 1 is that the inner peripheral surface of the case 12A has an uneven portion 12c that contacts the resin 13. Hereinafter, each configuration will be described in more detail.

[Magnetic core]
The magnetic core 10 includes a pair of rectangular parallelepiped coil winding portions 10c and a pair of end cores 10e on which the coils 11 are not disposed, and end portions so as to sandwich the coil winding portions 10c disposed apart from each other. The core 10e is arranged to form a closed loop (annular). The magnetic core 10 includes a magnetic part 10m made of a soft magnetic material containing iron such as iron or steel, and a gap material (not shown) made of a nonmagnetic material such as alumina. The magnetic body portion 10m is configured by combining a plurality of core pieces. In particular, the coil winding portion 10c is configured by alternately laminating core pieces and gap materials. Each core piece can be a soft magnetic powder compact or a laminate of a plurality of electromagnetic steel plates. A gap material is a member arrange | positioned in the clearance gap provided between core pieces for adjustment of an inductance. The core piece and the gap material are integrally joined with an adhesive or the like. The number of core pieces divided and the number of gap members can be appropriately selected so that the reactor 1 has a desired inductance.

[coil]
The coil 11 is formed by winding a single continuous winding 11w and includes a pair of coil elements arranged in parallel. The winding 11w is a coated wire having an enamel coating on the surface of a copper rectangular wire. Both coil elements are formed by winding this covered wire edgewise, and are connected by a winding portion 11r. In addition to the above-described rectangular wire, the winding may have various shapes such as a circular cross section and a polygonal cross section. Alternatively, each coil element may be manufactured separately, and the ends of the windings forming each coil element may be joined by welding or the like to form an integral coil.

  A terminal member (not shown) made of a conductive material is joined to both end portions 11e of the winding forming the coil 11, and an external device (not shown) such as a power source that supplies power to the coil 11 through this terminal member. Connected). For joining, welding such as TIG welding can be used.

[Insulator]
The combined body 1A includes an insulator 14 between the magnetic core 10 and the coil 11 to enhance insulation between the magnetic core 10 and the coil 11. The insulator 14 includes a configuration including a cylindrical portion 14t that covers the outer periphery of the coil winding portion 10c, and a frame-shaped portion 14f that comes into contact with an end surface of the coil 11 (a surface in which the coil turns appear to be annular). . As the constituent material of the insulator, insulating materials such as polyphenylene sulfide (PPS) resin, polytetrafluoroethylene (PTFE) resin, and liquid crystal polymer (LCP) can be used.

[Case]
The combination 1A is housed in an aluminum case 12A. The case 12A is an open box-like body having a rectangular bottom surface 12b and four side walls 12s erected from the bottom surface 12b. In particular, an uneven portion 12c is provided integrally with the side wall 12s on the inner peripheral surface of the side wall 12s.

  On the inner peripheral surface of the side wall 12s, a plurality of linear ridges are erected in parallel, and continuous projections and depressions are formed by these ridges. The concavo-convex portion 12c is constituted by this continuous concavo-convex portion. Each ridge extends in the circumferential direction of the inner peripheral surface of the side wall 12s, and is arranged in parallel in a direction from the bottom surface 12b toward the opening (vertical direction in FIG. 1 (B), hereinafter referred to as a height direction). ing. As the protrusion amount of each ridge (the difference between the peak and valley portions of the ridge) increases, the contact area increases. However, in consideration of formability, 100 μm to 1 mm is preferable. These ridges are formed by forming a case with a smooth inner peripheral surface by casting using a mold having a smooth surface with which the molten metal contacts, and then cutting the inner peripheral surface. .

  The example shown in FIG. 1 shows a state in which the two opposing side walls are provided with an uneven portion, but the four side walls may be provided with an uneven portion, or only one side wall may be provided with an uneven portion. . In addition, the example shown in FIG. 1 shows a state in which an uneven portion is provided on the entire side wall from the bottom surface of the case to the opening portion, but only the bottom surface side, only the opening portion side, or an intermediate portion between the bottom surface and the opening portion. It is good only as well. The points related to these concavo-convex portions are the same in the second and third embodiments described later.

[Filling resin]
The case 12A is filled with a resin (here, epoxy resin) 13, and the combined body 1A is covered with the resin 13 except for both end portions 11e and the rewinding portion 11r of the winding 11w.

[Assembly of reactor assembly]
A reactor having the above configuration can be formed as follows.

  First, the combined body 1A of the magnetic core 10 and the coil 11 is formed. Specifically, the core piece or gap material is fixed with an adhesive or the like to form the coil winding portion 10c, the cylindrical portion 14t of the insulator 14 is disposed on the outer periphery, and the coil 11 is disposed on the outer periphery. . The coil 11 is prepared separately by winding the winding 11w. The frame-like portion 14f and the end core 10e are arranged on the coil 11 so that the end face of the coil 11 is sandwiched between the frame-like portion 14f and the end core 10e of the insulator 14, and the end core 10e and the coil are wound with an adhesive or the like. The turn part 10c is joined to form the combined body 1A. Further, the case 12A having the concavo-convex portion 12c is produced by casting and cutting as described above.

  Next, after the formed assembly 1A is stored in the case 12A, the case 12A is filled with the resin 13 and cured. Both end portions 11e and winding portions 11r of the windings forming each coil 11 are exposed from the resin 13. The reactor 1 is assembled by the above process.

[effect]
Reactor 1 having the above-described configuration is provided with uneven portion 12c on the inner peripheral surface of side wall 12s of case 12A, so that the contact area between resin 13 and case 12A filled between case 12A and assembly 1A Is big. Therefore, the reactor 1 has a higher adhesion between the case 12A and the resin 13 than before, and the resin 13 cracks when the reactor 1 is used while being fixed to a cooling base (not shown). However, it is expected that the union 1A is difficult to drop out of the case 12A. In particular, the reactor 1 has a protrusion protruding so as to be orthogonal to the direction (height direction) in which the combined body 1A is dropped, so that the resin 13 is locked to the protruding line and the combined body 1A is difficult to drop off. Be expected.

  Further, the reactor 1 does not include a stay member for fixing the combined body 1A to the case 12A, and can reduce the number of parts and the stay member attaching work. Furthermore, in this reactor 1, since the concavo-convex portion 12c is formed by cutting, a case can be manufactured using a normal casting mold, so that a specially shaped mold is unnecessary. In addition, in the reactor 1, since the case 12A is made of aluminum, the heat dissipation is excellent.

  Further, in the end core 10e of the magnetic core 10 shown in the first embodiment, the surface on the side in contact with the bottom surface of the case 12A and the surface facing this surface and disposed on the opening side of the case 12A are the outer periphery of the coil 11. It is flush with the surface. With this configuration, the assembly 1A can be stably stored in the case 12A, and the end core 10e is in direct contact with the case 12A having excellent heat dissipation, so that the heat generated in the assembly 1A is transmitted through the case 12A. It can be released efficiently. Further, when the volume of the end core provided in the conventional reactor in which the outer peripheral surface of the coil protrudes from the outer peripheral surface of the end core is equal to the volume of the end core 10e of the magnetic core 10 shown in the first embodiment, As described above, the axial length of the coil 11 in the combined body 1A is shorter than that of the conventional reactor. Therefore, the reactor 1 can also reduce installation space. In the end core 10e, the winding portion 11r is pulled up above the turn forming surface of the coil so that the surface disposed on the opening side of the case 12A can be flush with the outer peripheral surface of the coil 11. (FIG. 1 (A) shows a form in which the winding portion 11r is not lifted).

(Modification 1)
In the first embodiment, the concavo-convex portion can be formed by a surface roughening process using shot blasting or wrinkling instead of cutting. In this case, when the surface roughness Ra (arithmetic mean roughness) is 100 μm to 1 mm, it is expected that the contact area with the resin is increased and the adhesion is improved.

<Embodiment 2>
FIG. 2 is a top view schematically showing another reactor of the present invention, in which (A) shows an example in which a stay member is not provided, and (B) shows an example in which a stay member is provided. The reactor 2 has the same basic configuration as that of the reactor 1 shown in the first embodiment, but is different in the form of the uneven portion 12c included in the case 12B. Hereinafter, the description will focus on the differences, and description of other points will be omitted. In addition, in the top view of FIGS. 2-4, the winding-up part is abbreviate | omitted.

  In the case 12B of the second embodiment, a plurality of linear ridges are erected in parallel on the inner peripheral surface of the side wall 12s, and the concavo-convex portion 12c is constituted by continuous undulations formed by these ridges. Each ridge extends in the height direction and is arranged in parallel in the circumferential direction. The protruding amount of each ridge is 100 μm to 1 mm. These ridges are formed integrally with the case when a mold having projections and depressions suitable for the projections and depressions is prepared, and the case is manufactured by casting using the projection and depression mold.

  In the reactor 2 having the above-described configuration, the contact area between the case 12B and the resin 13 is increased by the concavo-convex portion 12c in the same manner as in the first embodiment described above, so that the adhesion can be enhanced. In addition to this effect, the reactor 2 can form the uneven portion 12c at the same time when the case 12B is manufactured, so that the case having the uneven portion is excellent in manufacturability.

  Further, as shown in FIG. 2 (B), a stay member 20 is disposed so as to surround the outer periphery of the end core 10e of the magnetic core 10, and the stay member 20 is fixed to the case 12B with a bolt 21. Thus, the combined body 1A can be more securely fixed to the case 12B, and the risk of falling off can be reduced. This configuration can also be applied to other embodiments. Further, by increasing the adhesion between the case 12B and the resin 13 by the uneven portion 12c, the stay member 20 provided in the reactor 2 is smaller than the stay member used in the conventional reactor, for example, A thing with a narrow width can be used.

<Embodiment 3>
FIG. 3 is a top view schematically showing another reactor of the present invention. Reactor 3 has a basic configuration similar to that of reactor 1 shown in the first embodiment, except that case 12C is composed of a combination of divided pieces. Hereinafter, the description will focus on the differences, and description of other points will be omitted.

The case 12C of Embodiment 3 is integrally formed by combining a pair of divided pieces 12C 1 and 12C 2 that are divided in the parallel direction of the coil elements (the direction orthogonal to the axial direction of the coil elements, hereinafter referred to as the horizontal direction). Is done. The joint portion between the divided pieces 12C 1 and 12C 2 is positioned in parallel to the axial direction of the coil element. The divided pieces 12C 1 and 12C 2 are joined by welding, and a welding hump 30 is formed on the inner peripheral surface side of the case 12C.

In the case 12C of the third embodiment, on the inner peripheral surface of the side wall 12s, as in the case 12A of the first embodiment, a plurality of linear ridges extending in the circumferential direction are erected in parallel in the height direction of the case 12C. The concavo-convex portion 12c is constituted by the continuous concavo-convex formed by these ridges (projection amount of the ridges: 100 μm to 1 mm). The divided pieces 12C 1 and 12C 2 constituting the case 12C of the third embodiment are formed integrally with the case when the case is manufactured by casting using a concavo-convex mold as in the second embodiment. The

  In the reactor 3 having the above configuration, the adhesion between the case 12C and the resin 13 can be enhanced by the concavo-convex portion 12c as in the first and second embodiments. In addition to this effect, the reactor 3 can form the concave and convex portion 12c at the same time when the case 12C is manufactured, so that it is excellent in manufacturability of the case having the concave and convex portion. In particular, the reactor 3 can be easily pulled out of the mold by forming the split piece so that the case 12C is a combination of split pieces and the protruding ridges extending in the circumferential direction are divided. It is further excellent in manufacturability. Further, the reactor 3 performs the joining of these divided pieces by welding, and the welding hump 30 can also function as a convex portion for increasing the contact area with the resin, so that the contact area between the case 12C and the resin 13 is increased. You can increase more.

(Modification 2)
In the second and third embodiments, the ridges can be formed by cutting or the like after manufacturing the case, as in the first embodiment. In particular, the case 12C of the third embodiment is a state in which the inner peripheral surfaces of the divided pieces 12C 1 and 12C 2 are opened before the divided pieces 12C 1 and 12C 2 are joined, and the ridges are formed by cutting in this opened state. Then, it is easy to form a ridge.

<Embodiment 4>
FIG. 4 schematically shows another reactor of the present invention, where (A) is a partial cross-sectional view and (B) is a top view. Reactor 4 has a basic configuration similar to that of reactor 1 shown in the first embodiment, except that case 12D is formed of a combination of divided pieces, and the shape of uneven portions (convex pieces 12f) is different. Hereinafter, the description will focus on the differences, and description of other points will be omitted.

The case 12D of the fourth embodiment is integrally formed by combining a pair of divided pieces 12D 1 and 12D 2 that are divided in the horizontal direction, like the case 12C of the third embodiment. The case 12D includes a protruding piece 12f that protrudes inward from the opening. The convex piece 12f shown in FIG. 4 has a rectangular shape, but the shape and size of the convex piece (the length in the horizontal direction and the amount of protrusion) are not particularly limited. Here, the convex piece is shorter than the horizontal length of the inner peripheral surface of the side wall 12s, and the convex piece partially exists on the inner peripheral surface of the side wall 12s (projection amount of the convex piece: 100 μm to 1 mm). A part of the opening of the case 12D is covered with the convex piece 12f. Convex pieces 12f are divided piece 12D 1, 12D 2 are formed integrally with the split piece 12D 1, 12D 2 are divided as divided pieces 12D 1, 12D 2 joints each other exist in a convex piece 12f Has been. Such divided pieces 12D 1 and 12D 2 can be manufactured by casting using a mold having a recess that fits the convex piece 12f, and can be easily extracted from the mold. These divided pieces 12D 1 and 12D 2 are joined by welding, and a welding hump 40 is formed on the inner peripheral surface side of the case 12D.

  In the reactor 4 having the above-described configuration, the adhesion between the case 12D and the resin 13 can be enhanced by the convex pieces 12f as in the first to third embodiments having the uneven portion described above. In addition to this effect, since the reactor 4 is a combination of divided pieces like the case 12C of the third embodiment, the reactor 4 is excellent in manufacturability, and the welding hump 40 also has a contact area with the resin. It is made to function as a convex part for increasing. In particular, the reactor 4 has a convex piece 12f so as to cover a part of the opening of the case 12D, so that the opening becomes small, so that the combined body 1A integrated with the resin 13 is dropped from the case 12D. It is expected to prevent this.

  In addition to the convex piece 12f, since it has a configuration including the concavo-convex portion 12c composed of a plurality of ridges described in the first to third embodiments, the bonding area between the case and the resin can be increased, so both Can be further improved.

(Modification 3)
In the fourth embodiment, the configuration in which the convex piece 12f is integrally formed with the case 12D has been described. However, the convex piece 12f may be a separate member. In this case, a conventionally used case can be used, and the case can be easily manufactured. Further, in this embodiment, since the convex piece can be attached after the assembly of the magnetic core and the coil is stored in the case, the opening of the case is not narrowed by the convex piece when the assembly is stored in the case, Easy to store the assembly in the case. Furthermore, by making the convex piece a separate member, the degree of freedom of the shape of the convex piece is increased, for example, a frame-like body having a similar shape to the opening, or a plurality of convex pieces are arranged at arbitrary positions of the opening can do. In addition, when the case is a combination of divided pieces, the convex piece can be used as a connecting member between the divided pieces. In the form having this convex piece, after the convex piece is attached to the case, the case is filled with resin so that the convex piece and the resin come into contact with each other.

  The above-described embodiment can be appropriately changed without departing from the gist of the present invention, and is not limited to the above-described configuration.

  The reactor of the present invention can be suitably used for a component part of a power conversion device such as a converter mounted on a vehicle such as a hybrid vehicle or an electric vehicle.

(A) is a schematic perspective view of an assembly of a magnetic core and a coil constituting the reactor shown in Embodiment 1, and (B) is a partial cross-sectional view schematically showing this reactor. FIG. 5 is a top view schematically showing a reactor shown in Embodiment 2, in which (A) shows an example in which a stay member is not provided, and (B) shows an example in which a stay member is provided. 5 is a top view schematically showing a reactor shown in Embodiment 3. FIG. (A) is a partial sectional view schematically showing the reactor shown in Embodiment 4, and (B) is a top view of the reactor. It is a schematic perspective view of the conventional reactor.

Explanation of symbols

1,2,3,4 Reactor 1A Union
10 Magnetic core 10c Coil winding part 10m Magnetic body part 10e End core
11 Coil 11w Winding 11e Winding end 11r Rewinding part 12c Concavity and convexity
12A, 12B, 12C, 12D Case 12f Convex piece 12b Bottom 12s Side wall
12C 1, 12C 2, 12D 1 , 12D 2 divided pieces 13 resin 14 insulator 14t tubular portion
14f Frame 20 Stay member 21 Bolt 30,40 Weld hump
100 Magnetic core 100e End core 110 Coil 120 Case 130 Resin
140 Stay member 141 Bolt L Reactor

Claims (5)

  1. A reactor comprising a combination comprising a coil and an annular magnetic core in which the coil is disposed, and a case for housing the combination,
    Comprising resin filled between the case and the combination;
    The case is an open box-like body having a bottom surface and a side wall standing from the bottom surface, and at least one of a concave portion and a convex portion that contacts the resin is formed on an inner peripheral surface of the side wall. A reactor characterized by
  2.   2. The reactor according to claim 1, wherein at least one of the concave portion and the convex portion is formed by any one of shot blasting, polishing treatment, and cutting.
  3.   2. The reactor according to claim 1, further comprising a projecting piece projecting inward from the opening of the case.
  4.   3. The reactor according to claim 1, wherein the case is configured by combining a plurality of divided pieces.
  5. The case is configured by combining a plurality of divided pieces,
    4. The reactor according to claim 3, wherein the convex piece is formed integrally with the divided piece and has a joint portion between the divided pieces.
JP2008193821A 2008-07-28 2008-07-28 Reactor Pending JP2010034228A (en)

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JP2011243854A (en) * 2010-05-20 2011-12-01 Denso Corp Reactor
JP2012253289A (en) * 2011-06-06 2012-12-20 Tamura Seisakusho Co Ltd Bobbin for coil device and coil device
JP2013030624A (en) * 2011-07-28 2013-02-07 Denso Corp Reactor
JP2013062389A (en) * 2011-09-14 2013-04-04 Nippon Soken Inc Reactor
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