JP5381673B2 - Reactor - Google Patents

Description

  The present invention relates to a reactor used for a component part of a power conversion device such as a vehicle-mounted DC-DC converter such as a hybrid vehicle.

  Conventionally, a reactor including a magnetic core and a coil disposed in the core is known. As a structure of the reactor, Patent Document 1 discloses a form including a coil formed by winding a winding and a magnetic core formed by filling and curing a core material in which iron powder is mixed in resin inside and outside the coil. Has been. The reactor is formed by housing a coil in an aluminum case having an opening, and injecting the core material into the case and curing it. The end of the winding is drawn from the opening at the top of the case.

JP 2008-192649 A

  In conventional reactors, the coil itself is difficult to handle due to the expansion and contraction of the coil in the process of placing the coil in the case and filling and curing the core material inside and outside of the coil, which is a factor in deteriorating reactor production efficiency. It has become.

  In addition, the conventional reactor has a structure that covers the inner and outer peripheries of the coil with a core material, and since there is no member that defines the axial length of the coil before the core material is cured, the expansion and contraction of the coil due to its springback is suppressed. Can not do it. For this reason, the axial length of the coil may vary after the core material is cured, and the inductance also varies.

  The present invention has been made in view of the above circumstances, and one of its purposes is to provide a reactor capable of defining the axial length of the coil and fixing the coil to the defined length.

  The present invention achieves the above object by attaching a coil fixing portion that supports both ends of the coil.

  The present invention relates to a reactor including a coil formed by winding a winding and a magnetic core on which the coil is disposed. In the magnetic core, a closed magnetic path is formed by both an inner core portion inserted inside the coil and a connecting core portion covering at least a part of the outer periphery of the coil. The inner core portion has a saturation magnetic flux density higher than that of the connection core portion. The connecting core portion has a lower magnetic permeability than the inner core portion, and is composed of a mixture of a magnetic material and a resin. And the said inner core part and the said connection core part are integrated with the said resin. The coil is attached with a coil fixing portion that defines the axial length of the coil. The coil fixing portion includes an end support portion that contacts both end portions of the coil, and a connecting portion that connects the end support portions.

  In the reactor according to the present invention, by suppressing the expansion and contraction of the coil at the end support portions that are in contact with both ends of the coil, the handling of the coil is facilitated, and the productivity of the reactor is improved. In addition, in the manufacturing process of the reactor, it is possible to suppress the state where the coil returns to the free length by the spring back, so after curing the resin of the connecting core portion, it is possible to eliminate the variation in the axial length of the coil, It is possible to eliminate variations in inductance.

  In the reactor of the present invention, the magnetic core is not made of a uniform material, but is made of a different material, so that the magnetic properties of the magnetic core are partially different as described above. Specifically, the saturation magnetic flux density of the inner core portion is higher than the saturation magnetic flux density of the connection core portion. Therefore, when the magnetic core is made of a uniform material and the same saturation magnetic flux density is obtained as compared with the magnetic core having a uniform saturation magnetic flux density and permeability throughout the entire core, The cross-sectional area of the core portion can be reduced to reduce the size. In addition, by integrating both core portions, a configuration without a normal gap provided for the purpose of reducing magnetic flux saturation, such as a gap material or air gap made of a non-magnetic material, in a magnetic core, so-called A gapless structure can also be used. Therefore, the inner peripheral surface of the coil can be disposed close to the outer peripheral surface of the inner core portion, and the gap between the coil and the inner core portion can be reduced, preferably this gap can be substantially eliminated. . Here, when the magnetic core has a gap material, if the coil is placed close to the gap portion, the influence of the leakage magnetic flux from the gap reaches the coil and a loss occurs. Therefore, when a magnetic core having a gap material is used, it is necessary to provide a certain gap between the inner peripheral surface of the coil and the outer peripheral surface of the inner core portion in order to reduce the loss. On the other hand, in the case of a gapless structure, the loss does not occur even if the inner peripheral surface of the coil is disposed close to the outer peripheral surface of the inner core portion, and the coil and the inner core portion are disposed closer to each other. Can be downsized.

  In the reactor according to the present invention, the constituent material of the connecting core portion is a mixture of a magnetic material and a resin, and the inner core portion and the connecting core portion are integrated by this resin. Moreover, a coil and an inner core part can also be integrated by the constituent resin of a connection core part. For example, by forming the connecting core portion so as to cover the outer periphery of the assembly of the coil and the inner core portion, a magnetic core having predetermined characteristics can be formed, and a reactor can be manufactured. Thus, the formation of the connecting core part, the formation of the magnetic core, and the production of the reactor can be performed simultaneously, and the productivity is excellent.

  Furthermore, this invention reactor can fully satisfy | fill predetermined | prescribed inductance because the magnetic permeability of a connection core part is lower than the magnetic permeability of an inner core part. In particular, since the connecting core portion can easily change the magnetic characteristics by adjusting the ratio of the magnetic material and the resin, it is easy to adjust the inductance of the reactor. Moreover, it can be set as an adhesive-less structure by integrating an inner core part and a connection core part with the constituent resin of a connection core part.

  As one form of this invention, it is mentioned that the said connection part has a convex part interposed between the turns of the said coil.

  By interposing the convex portion between the turns of the coil, the insulation between the turns can be reinforced. Further, by making the thickness of the convex portion uniform, the coil turns can be kept uniform. Further, the inductance can be adjusted to a desired value by adjusting the distance between the turns by the convex portion.

  As one form of this invention, it is mentioned that the said coil fixing | fixed part is arrange | positioned in at least one part of the outer periphery of the said coil.

  When the coil fixing part is arranged from the outside of the coil, the coil fixing part can be easily attached. Moreover, the insulation between a coil and a connection core part can be strengthened.

  As one form of this invention, it is mentioned that the said coil fixing | fixed part is arrange | positioned between the said coil and the said inner core part.

  By arrange | positioning a coil fixing | fixed part inside a coil, the insulation between a coil and an inner core part can be strengthened. Moreover, this coil fixing | fixed part can be used as a role of the bobbin conventionally used, and can also position the inner core part with respect to a coil.

  This invention reactor can prescribe | regulate the axial length of a coil by attaching the coil fixing | fixed part which supports the both ends of a coil, and can fix a coil to the prescription | regulation length.

FIG. 1 is a perspective view illustrating an outline of the reactor according to the first embodiment. 2 shows the reactor of FIG. 1, FIG. 2 (A) is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 2 (B) is a partially cutaway view seen from the top. FIG. 3 is a cross-sectional view of the reactor according to the second embodiment.

  Hereinafter, a reactor according to an embodiment will be described with reference to the drawings. The same reference numerals in the figure indicate the same names.

<Embodiment 1>
The reactor 1 which concerns on this invention is demonstrated based on FIG.1 and FIG.2. The reactor 1 includes a coil 2 formed by winding a winding 2w and a magnetic core 3 on which the coil 2 is disposed. The coil 2 is attached with a coil fixing portion 4 that defines the axial length of the coil 2. Hereinafter, each configuration of the reactor 1 will be described in more detail.

[coil]
The coil 2 is a rectangular tube formed by spirally winding one continuous winding. The winding 2w is preferably a coated wire having an insulating coating made of an insulating material on the outer periphery of a conductor made of a conductive material such as copper or aluminum. Here, the coil 2 is formed by edgewise winding a rectangular wire with a conductor made of a rectangular copper wire and an insulating coating made of enamel. As the cross-sectional shape of the conductor, a rectangular shape, a circular shape or a polygonal shape other than a rectangular shape can be used. In addition to the rectangular tube shape, the coil 2 can be a cylindrical one. Here, although it is set as the structure provided with one coil, it is good also as a structure provided with two coil elements as described in patent document 1 in parallel.

  Both ends of the winding 2w forming the coil 2 are appropriately extended from the turn portion and drawn to the outside of the connecting core portion 3o, which will be described later. A terminal member (not shown) made of a conductive material such as is connected. An external device (not shown) such as a power source for supplying power is connected to the coil via the terminal member. In addition to welding such as TIG welding, crimping or the like can be used to connect the conductor portion of the winding 2w and the terminal member.

[Magnetic core]
The magnetic core 3 includes an inner core portion 3i inserted inside the coil 2 and a connecting core portion 3o covering at least a part of the outer periphery of the coil, and a closed magnetic circuit is formed by both of them. In particular, the magnetic properties of the magnetic core 3 are different because the constituent material of the inner core portion 3i and the constituent material of the connecting core portion 3o are different. Specifically, the inner core portion 3i has a higher saturation magnetic flux density than the connecting core portion 3o, and the connecting core portion 3o has a lower magnetic permeability than the inner core portion 3i.

≪Inner core part≫
The inner core portion 3i has an outer shape along the shape of the inner peripheral surface of the coil 2. That is, as shown in FIG. 1, the inner core portion 3i is a rectangular (track shape) rectangular parallelepiped with rounded corners. The entire inner core portion 3i is composed of a compacted body, and no gap material, air gap, or adhesive is present.

  The green compact is typically obtained by molding a soft magnetic powder having an insulating coating on the surface and firing it at a temperature lower than the heat resistance temperature of the insulating coating. A mixed powder in which a binder is appropriately mixed in addition to the soft magnetic powder can be used, or a powder having a coating made of a silicone resin or the like can be used as the insulating coating. The saturation magnetic flux density of the green compact can be changed by adjusting the material of the soft magnetic powder, the mixing ratio of the soft magnetic powder and the binder, the amount of various coatings, and the like. For example, a powder compact with a high saturation magnetic flux density can be obtained by using a soft magnetic powder with a high saturation magnetic flux density or by increasing the proportion of the soft magnetic material by reducing the blending amount of the binder. In addition, the saturation magnetic flux density tends to be increased by increasing the molding pressure. It is preferable to select a soft magnetic powder and adjust a molding pressure so as to obtain a desired saturation magnetic flux density.

  The above soft magnetic powder includes Fe-based alloy powders such as Fe-Si, Fe-Ni, Fe-Al, Fe-Co, Fe-Cr, Fe-Si-Al as well as iron group metal powders such as Fe, Co and Ni. Or rare earth metal powder, ferrite powder, etc. can be used. In particular, the Fe-based alloy powder is easy to obtain a green compact with a high saturation magnetic flux density. Such a powder can be produced by an atomizing method (gas or water), a mechanical pulverization method, or the like. In particular, when a powder made of a nanocrystalline material whose crystals are nano-sized, preferably a powder made of an anisotropic nanocrystalline material, a compact with a high anisotropy and a low coercive force is obtained. Examples of the insulating coating formed on the soft magnetic powder include a phosphoric acid compound, a silicon compound, a zirconium compound, or a boron compound. Examples of the binder include thermoplastic resins, non-thermoplastic resins, and higher fatty acids. This binder disappears by the above baking, or changes to an insulator such as silica. The compacted body is a case in which an insulating material such as an insulating film is present so that soft magnetic powders are insulated from each other, eddy current loss can be reduced, and high-frequency power is applied to the coil. However, the loss can be reduced. A well-known thing may be utilized for a compacting body.

  In the reactor 1 shown in FIG. 1, the axial length of the coil 2 in the inner core portion 3i is slightly longer than the length of the coil 2, and both end surfaces of the inner core portion 3i protrude from the end surface of the coil. The length of the inner core part 3i may be equal to the length of the coil 2 or may be slightly shorter. When the length of the inner core portion 3i is equal to or greater than the length of the coil 2, the magnetic flux generated by the coil 2 can be sufficiently passed through the inner core portion 3i.

≪Connected core part≫
The entire connecting core portion 3o is formed of a mixture of a magnetic material and a resin (molded and cured body), and is connected to the inner core portion 3i so that the magnetic core 3 has a closed magnetic path. The connection core part 3o shown in FIG. 1 is formed so as to cover substantially the entire outer periphery of the assembly of the coil 2 and the inner core part 3i inserted into the coil 2. That is, the connecting core portion 3o covers the entire outer periphery of the coil 2, both end surfaces of the coil 2, and both end surfaces of the inner core portion 3i. The magnetic core 3 can form an annular closed magnetic circuit by the connecting core portion 3o and the inner core portion 3i. The connecting core portion 3o and the inner core portion 3i are joined by the constituent resin of the connecting core portion 3o without an adhesive. Therefore, the magnetic core 3 is an integrated body that is integrated without any gaps.

  The shape of the connecting core portion 3o is not particularly limited as long as the magnetic core 3 can form a closed magnetic circuit. For example, the length of the inner core portion 3i is longer than the length of the coil 2, and at least one end surface of the inner core portion 3i is exposed from the connecting core portion 3o, and the magnetic core 3 is formed by the end surface and the surface of the connecting core portion 3o. It is good also as a form which makes the external shape. Alternatively, at least a part of the outer periphery of the coil 2 may be exposed without being covered by the connecting core portion 3o.

  The mixture of the magnetic material and the resin (molded and cured body) can be typically formed by injection molding or cast molding. Injection molding usually involves mixing soft magnetic powder (mixed powder with non-magnetic powder added if necessary) and fluid binder resin, and applying this mixed fluid to a mold by applying a predetermined pressure. After casting and molding, the binder resin is cured. In cast molding, a mixed fluid similar to that of injection molding is obtained, and then the mixed fluid is injected into a molding die without applying pressure to be molded and cured. In any molding technique, a thermosetting resin such as an epoxy resin, a phenol resin, or a silicone resin can be suitably used as the binder resin. When a thermosetting resin is used as the binder resin, the molded body is heated to thermoset the resin. A normal temperature curable resin or a low temperature curable resin may be used as the binder resin. In this case, the molded body is allowed to stand at a normal temperature to a relatively low temperature to be cured. Since the molded hardened body contains a large amount of binder resin, which is a non-magnetic material, even if the same soft magnetic powder as that of the green compact is used, the saturation magnetic flux density is lower and the permeability is lower than that of the green compact. Become.

  Even when the above injection molding or cast molding is used, the permeability of the connecting core portion 3o can be adjusted by changing the blending of the soft magnetic powder (or nonmagnetic powder) and the binder resin. For example, when the blending amount of the soft magnetic powder is reduced, the magnetic permeability tends to decrease. The magnetic permeability of the connecting core portion 3o may be adjusted so that the reactor 1 has a desired inductance.

  The soft magnetic powder used for the connecting core portion 3o can be the same as the soft magnetic powder used for the inner core portion 3i described above.

[Coil fixing part]
The coil fixing portion 4 has a rectangular plate shape having a pair of end portion support portions 4a that are in contact with both end portions of the coil 2 and a connecting portion 4b that connects the end portion support portions 4a. In this example, each end support portion 4a has a trapezoidal plate shape, and the connecting portion 4b has a rectangular plate shape and has a plurality of protrusions (convex portions) in parallel on one surface thereof. As the outer shape of the coil fixing portion 4, various outer shapes such as a parallelogram and a polygon can be adopted in addition to a rectangle.

≪End support part≫
Each end support 4a is a member that abuts on each end of the coil 2 and regulates the axial length of the coil 2 to suppress expansion and contraction of the coil 2. When the free length of the coil 2 is longer than the desired coil length, the coil 2 is compressed from both ends, and the axial length of the coil 2 is defined to be shorter than the free length and fixed. In this example, as shown in FIG. 1, trapezoidal plate-like end support portions 4 a are arranged at both ends of the coil 2 along the circumferential direction of the coil 2 on the upper surface side and the lower surface side of the coil 2. Is compressed from both ends and fixed.

  The shape of the end support portion 4a is not particularly limited as long as expansion and contraction of the coil 2 can be suppressed. As the outer shape of the end support portion 4a, various external shapes such as a rectangle and a polygon other than a rectangle can be adopted in addition to a trapezoid. In this example, the end support part 4a is a member having a trapezoidal outer shape, and the coil fixing part 4 has a rectangular shape in combination with a connecting part 4b described later.

  The material of the end support 4a is preferably a material having high thermal conductivity and high insulation. Specifically, epoxy resin, polyphenylene sulfide (PPS) resin, acrylonitrile-butadiene-styrene (ABS) resin, and the like can be used. In addition, use of ceramics such as alumina, which is a nonmagnetic material having high heat resistance and rigidity, can be expected.

≪Connecting part≫
The connecting portion 4b is a member for connecting the end support portions 4a. As shown in FIG. 1, the connecting portion 4 b includes protrusions (convex portions) interposed between the turns of the coil 2. The shape of the cross section of this convex part is a rectangle, and by making the thickness uniform, the space between the turns is kept uniform.

  If the connecting portion 4b can connect the end support portions 4a, the length along the circumferential direction of the coil 2 does not need to match the length of the end support portions 4a. For example, the length of the connecting portion 4b along the circumferential direction of the coil 2 may be such a length that the connecting portion 4b is connected only to the central portion of the length along the long side direction of each end support portion 4a. However, as shown in FIG. 1, if the lengths along the circumferential direction of the coil are the same in the connecting portion 4b and the end support portion 4a, the coil 2 is reliably attached.

  As long as the shape of the cross section of the convex part of the connection part 4b can maintain between turns, various external shapes, such as a circle, an ellipse, and a polygon, can be employ | adopted if it can maintain between turns.

  The connecting portion 4b may be a flat plate or a rod-like body having no convex portion as long as it has a function of connecting the end support portions 4a.

  As the material of the connecting portion 4b, it is preferable to use a material having high thermal conductivity and high insulation. Specifically, epoxy resin, polyphenylene sulfide (PPS) resin, acrylonitrile-butadiene-styrene (ABS) resin, and the like can be used. By configuring with such an insulating material, the coupling portion 4b can improve the insulation between the outer peripheral surface of the coil 2 and the coupling core portion 3o, and each convex portion is interposed between the turns. The insulation between turns can be improved. The connecting portion 4b may be molded separately from a material different from the material of the end support portion 4a, and then integrated by bonding or the like, but may be molded as an integrated body integrated with the same material as the end support portion 4a. In this case, the coil fixing part 4 can be easily formed. On the other hand, in order to firmly fix both end portions of the coil 2, the end support portion 4a can be formed of a material having higher strength than the connecting portion 4b.

  Since the coil 2 is formed by spirally winding the winding 2w, as shown in FIG. 2 (A), the coil fixing portion 4 on the upper surface side and the coil fixing portion 4 on the lower surface side are wound together. Arranged according to the winding pitch of 2w. In this example, the end support portion 4a on the left side of the upper surface is shifted to the right by one pitch along the axial direction of the coil with respect to the end support portion 4a on the left side of the lower surface. Accordingly, the convex portion of the connecting portion 4b on the upper surface side is arranged to be shifted to the right by one pitch along the axial direction of the coil with respect to the convex portion of the connecting portion 4b on the lower surface side. In this example, the upper surface side of the turn constituting the coil 2 is inclined as shown in FIG.2 (B), and the coil 2 is made by inclining the convex portion of the connecting portion 4b along the shape of this turn. It is fixed. Further, the coil 2 is fixed by fitting each turn into a groove formed by a plurality of convex portions arranged in parallel in the connecting portion 4b.

  This coil fixing portion 4 can be installed on the side surface side as well as the upper surface side and lower surface side of the coil 2. Furthermore, if the coil fixing part 4 is installed so as to cover the entire circumference of the coil 2, the area to be fixed becomes large, the coil 2 can be firmly fixed, the coil fixing part 4 is not easily dropped, and transportation is easy. In the case where the coil fixing portion 4 is installed so as to cover the entire circumference of the coil 2, a configuration in which the coil fixing portion 4 is divided into a plurality of parts and formed into a cylindrical shape by combining the divided pieces is preferable.

[Other components]
The insulation between the coil 2 and the magnetic core 3 can be ensured by the insulation coating of the winding 2w that constitutes the coil 2. In order to further increase the insulation, an insulator may be interposed at a location where the coil 2 is in contact with the magnetic core 3. For example, a cylindrical bobbin (not shown) made of an insulating material may be disposed on the outer periphery of the inner core portion 3i. In particular, when the bobbin disposed on the outer periphery of the inner core portion 3i is a bobbin having an annular flange portion extending in the outer peripheral direction from both ends thereof, the insulation between the end face of the coil 2 and the connecting core portion 3o can be improved. . As the bobbin constituent material, an insulating resin such as polyphenylene sulfide (PPS) resin, liquid crystal polymer (LCP), polytetrafluoroethylene (PTFE) resin can be suitably used.

[Reactor manufacturing method]
The reactor 1 of the present invention can be manufactured, for example, as follows. First, the coil fixing portion 4 is disposed on the outer periphery of the coil 2 formed by winding the winding 2w. The convex portion of the connecting portion 4b is interposed between the turns of the coil 2, and both end portions of the coil 2 are fixed by the end portion supporting portion 4a. An inner core portion 3i made of a powder compact is inserted into the coil 2 fixed by the coil fixing portion 4. By doing so, the coil is not expanded and contracted by the coil fixing portion 4, and the inner core portion 3i is easily inserted. The inner core portion 3i may be inserted into the coil 2 before the coil fixing portion 4 is disposed. The assembly of the coil 2 fixed by the coil fixing portion 4 and the inner core portion 3i is stored in a mold (not shown), and the end of the winding 2w is pulled out from the opening of the mold, and if necessary To fix outside the mold (not shown). In this mold, a mixed fluid of a magnetic material and a binder resin constituting the coupling core portion 3o is appropriately poured to form the coupling core portion 3o having a predetermined shape, and then the binder resin is cured to thereby form the reactor 1 Is obtained.

[effect]
By attaching the coil fixing portions 4 that support both ends of the coil 2, the expansion and contraction of the coil 2 can be suppressed, the handling of the coil 2 is facilitated, and the productivity of the reactor 1 is improved. Furthermore, since the state in which the coil 2 returns to the free length can be suppressed by the spring back, the variation in the axial length of the coil 2 after curing the core material can be eliminated, and the variation in inductance can be eliminated. it can.

  Moreover, the reactor 1 can improve the insulation of the outer peripheral surface of the coil 2 and the connection core part 3o by attaching the coil fixing | fixed part 4 comprised with the insulating material. Furthermore, by interposing a convex part between the turns of a coil, the insulation between each turn can be improved.

<Embodiment 2>
Next, the reactor 1 of Embodiment 2 is demonstrated with reference to FIG. The reactor 1 of the second embodiment is different from the first embodiment in that the coil fixing portion 4 is disposed between the coil 2 and the inner core portion 3i. Hereinafter, this difference will be mainly described, and the other configuration is the same as that of the reactor 1 of the first embodiment, and the description thereof will be omitted.

[Reactor manufacturing method]
The reactor 1 of Embodiment 2 can be manufactured as follows, for example. First, before inserting the inner core portion 3 i into the coil 2, the coil fixing portion 4 is disposed on at least a part of the inner periphery of the coil 2 from the inside of the coil 2. In this example, as shown in FIG. 3, the coil fixing portions 4 are respectively arranged on the upper surface side and the lower surface side on the inner peripheral surface of the coil 2. The convex portion of the connecting portion 4b is interposed between the turns of the coil 2 from the inside of the coil 2, and both end portions of the coil 2 are fixed by the end portion supporting portion 4a. The inner core portion 3i is inserted into the coil 2 in which the coil fixing portion 4 is disposed. By disposing the coil fixing portion 4 between the coil 2 and the inner core portion 3i, there is no need to separately provide an insulator such as a bobbin. The subsequent manufacturing method is the same as the manufacturing method in the first embodiment.

[effect]
By disposing the coil fixing part 4 inside the coil 2, the insulation between the coil 2 and the inner core part 3i can be reinforced. Further, the coil fixing portion 4 can be used as a role of a bobbin and can also position the inner core portion with respect to the coil.

  The above-described embodiments can be appropriately changed without departing from the gist of the present invention, and the scope of the present invention is not limited to the above-described configuration. For example, in this example, the coil 2 is compressed from both ends to define the axial length of the coil 2, and the coil 2 is fixed to the specified length, but the free length of the coil is larger than the desired coil length. If the coil is too short, the coil can be fixed to the specified length by pulling the coil from both ends, defining the axial length of the coil longer than the free length, and interposing a convex portion between the turns. It is.

  The reactor of the present invention can be used as a component of a power conversion device such as a bidirectional DC-DC converter mounted on a vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle.

1 Reactor
2 coil 2w winding
3 Magnetic core 3i Inner core 3o Connecting core
4 Coil fixing part 4a End support part 4b Connection part

Claims (4)

A coil formed by winding a winding;
A reactor comprising an inner core portion inserted inside the coil and a magnetic core in which a closed magnetic path is formed by both a connecting core portion covering at least a part of the outer periphery of the coil,
The inner core portion has a higher saturation magnetic flux density than the connecting core portion,
The connecting core portion has a lower magnetic permeability than the inner core portion, and is composed of a mixture of a magnetic material and a resin,
The inner core portion and the connecting core portion are integrated with the resin,
The coil is attached with a coil fixing portion that defines the axial length of the coil,
The coil fixing part is
End support portions that contact both ends of the coil;
It has a connecting portion for connecting the respective end support portion
The connecting portion has a convex portion interposed between the turns of the coil,
The said convex part is inclined along the turn of the said coil, The reactor characterized by the above-mentioned .   The reactor according to claim 1, wherein a material of the end support portion is higher in strength than the connection portion.   The reactor according to claim 1, wherein the coil fixing portion is disposed on at least a part of an outer periphery of the coil.   The reactor according to claim 1, wherein the coil fixing portion is disposed between the coil and the inner core portion.

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