Reactor

Abstract

To provide a reactor which can suppress a rise of temperature of the reactor while achieving improvement of workability and reduction in cost, and is excellent in heat dissipation efficiency.SOLUTION: A reactor includes: a middle leg 11 on which a coil 4 is mounted; a pair of outer legs 12 which extend in parallel with the middle leg 11, and are arranged at both sides of the middle leg 11; a core having a yoke part 13 for connecting the middle leg 11 and the outer leg 12; the coil 4 mounted on the core; and a core mold resin 2 coating the surface of the core. A heat dissipation member 6 which is brought into contact with the bottom surface of the coil 4 is provided. The core mold resin 2 has a bottom surface coating part 21 coating the bottom surface of the core, a contact part 22 which is brought into contact with the heat dissipation member 6, and a conductive part 23 connecting the bottom surface coating part 21 and the contact part 22.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a reactor having a core and a coil.

Background Art

[0002] Reactors are used in various applications such as OA equipment, solar power generation systems, automobiles, and uninterruptible power supplies. A reactor mainly consists of a coil and a core. The coil generates magnetic flux according to the number of turns by energization, and the core serves as a magnetic path through which the magnetic flux generated by the coil passes. A reactor is an electromagnetic component that converts electrical energy into magnetic energy for storage and release.

[0003] The core is composed of, for example, a pair of E-shaped core members having a middle leg, two outer legs arranged parallel to the extending direction of the middle leg on both sides adjacent to the middle leg, and a pair of yoke portions connecting the middle leg and the two outer legs. To insulate from the coil, this E-shaped core member is coated with a resin member. One coil is provided, the coil is mounted on the middle leg, and by joining the middle leg and the outer legs of the E-shaped core member facing each other, a closed magnetic circuit is formed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When energized, the temperature of the coil rises. Also, the temperature of the core rises due to heat generated by the loss of the reactor. Therefore, a heat radiating member such as a cooling sheet may be used to suppress the temperature rise of the coil and the core.

[0006] For example, in a device with three legs consisting of a central leg and two outer legs, and a coil mounted on the central leg, there is a method to suppress the temperature rise of the coil and core by placing heat dissipation members on the bottom surface of the coil, the bottom surfaces of the two outer legs, and the bottom surface of the pair of yoke sections. However, in this case, the work of placing heat dissipation members on each bottom surface is required, which worsens production efficiency. In addition, heat dissipation members are expensive, so material costs increase. Therefore, there is a strong demand for improved productivity and cost reduction.

[0007] On the other hand, the temperature rise of the coil and core cannot be ignored. When the temperature of the coil and core rises, the temperature of the reactor rises, resulting in a deterioration of its magnetic properties. Therefore, there is a need for a reactor that can improve heat dissipation while improving production efficiency and reducing costs.

[0008] The present invention was made to solve the above problems, and its objective is to provide a reactor that can suppress the temperature rise of the reactor and has excellent heat dissipation efficiency, while improving workability and reducing costs. [Means for solving the problem]

[0009] The reactor of the present invention comprises a core, a coil mounted on the core, and a core mold resin covering the surface of the core, and is provided with a heat dissipation member that contacts the bottom surface of the coil, the core mold resin having a bottom covering portion that covers the bottom surface of the core, a contact portion that contacts the heat dissipation member, and a conductive portion that connects the bottom covering portion and the contact portion, and the heat dissipation member is provided only on the bottom surface of the coil. The conductive portion has an inclined surface that slopes from the bottom covering portion toward the contact portion, and the inclined surface is formed to narrow inward. It is characterized by the fact that it is doing so. [Effects of the Invention]

[0010] According to the present invention, it is possible to obtain a reactor with excellent heat dissipation efficiency while suppressing the temperature rise of the reactor and improving workability and reducing costs. [Brief explanation of the drawing]

[0011] [Figure 1]This is a perspective view of the mold core. [Figure 2] This is a perspective view of an assembly with a coil attached to a molded core. [Figure 3] This is a perspective view showing the overall structure of the reactor. [Figure 4] This is a bottom perspective view of the mold core. [Figure 5] This is a diagram of a reactor equipped with a heat dissipation member, where (a) is a bottom plan view and (b) is a cross-sectional view. [Modes for carrying out the invention]

[0012] (Embodiment) The reactor according to this embodiment will be described with reference to the drawings. In each drawing, dimensions, positional relationships, proportions, or shapes may be emphasized for ease of understanding, and the present invention is not limited to such emphasis. Figure 1 is a perspective view of the molded core. Figure 2 is a perspective view of the assembly with coils attached to the molded core. Figure 3 is a perspective view showing the overall configuration of the reactor.

[0013] The reactor 10 is an electromagnetic component that converts electrical energy into magnetic energy for storage and release, and is used in various applications such as office automation equipment, solar power generation systems, and automobiles. The reactor 10 in this embodiment comprises a core 1, a core mold resin 2, a coil 4, and a secondary mold resin 5.

[0014] First, as shown in Figure 1, a pair of molded cores 3 are produced by molding core 1 with core mold resin 2. This process of molding core 1 with core mold resin 2 is called primary molding. In other words, core mold resin 2 can be referred to as primary molding resin. A coil 4 is assembled to this pair of molded cores 3 (see Figure 2), and as shown in Figure 3, the molded cores 3 and coil 4 are further molded with secondary molding resin 5 to integrate them. In other words, the reactor 10 of this embodiment is a reactor produced by two molding processes.

[0015] The core 1 can use a powder compact core, a ferrite core, a laminated steel plate, a metal composite core, or the like. A metal composite core is a magnetic material formed by kneading magnetic powder and resin and curing the resin. The core 1 serves as a magnetic path through which the magnetic flux generated by the coil 4 passes.

[0016] The core 1 is composed of a pair of E-shaped core members, and by joining the legs of this pair of E-shaped core members to each other, it has a schematic θ-shaped configuration with two annular shapes. That is, the core 1 has a middle leg 11, a pair of outer legs 12 that extend parallel to the middle leg 11 and are disposed on both sides adjacent to the middle leg 11, and a yoke portion 13 that connects the middle leg 11 and the outer legs 12. The outer diameter of the middle leg 11 is smaller than the inner diameter of the coil 4, and the coil 4 is mounted on the middle leg 11. On the other hand, the coil 4 is not mounted on the outer legs 12.

[0017] The core mold resin 2 is a resin member that coats the core 1. By molding the E-shaped core member with the core mold resin 2, a mold core 3 in which the E-shaped core member and the core mold resin are integrally formed is obtained. Two mold cores 3 are produced and fitted to each other.

[0018] Examples of the type of resin include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), or a composite thereof. Note that a heat-conductive filler may be mixed into the resin.

[0019] FIG. 4 is a bottom perspective view of the mold core. FIG. 5 is a view of the reactor provided with the heat dissipation member, where (a) is a bottom plan view and (b) is a cross-sectional view. Note that the heat dissipation member in FIG. 5(a) is shown as a perspective view so that other components can be seen. As shown in FIG. 4, the core mold resin 2 has a bottom covering portion 21, a contact portion 22, and a conduction portion 23. The bottom covering portion 21, the contact portion 22, and the conduction portion 23 are integrally formed without seams by molding.

[0020] The bottom covering portion 21 covers the bottom surface of the core 1. The bottom surface of the core 1 is the end face of the core 1 facing the heat dissipation member 6. It suffices for the bottom covering portion 21 to cover the leg portion of the core 1 where the coil 4 is not mounted. In the present embodiment, the bottom covering portion 21 covers the bottom surface of the outer leg 12. Note that the outer surface of the middle leg 11 is covered with the core mold resin 2 for insulation from the coil 4, but if insulation from the coil 4 can be achieved by covering the outer surface of the middle leg 11 with the secondary mold resin 5, it is not necessary to cover it with the core mold resin 2. The contact portion 22 contacts the heat dissipation member 6 provided on the bottom surface of the coil 4 described later. The contact portion 22 is a plate-like member having the winding axis direction of the coil 4 as the long side.

[0021] The conduction portion 23 is provided between the bottom covering portion 21 covering the core 1 where the coil 4 is not mounted and the contact portion 22, and connects the bottom covering portion 21 and the contact portion 22. By connecting the bottom covering portion 21 and the contact portion 22 with the conduction portion 23, the heat of the core 1 is released to the heat dissipation member 6 through the bottom covering portion 21, the conduction portion 23, and the contact portion 22.

[0022] A plurality of conduction portions 23 are provided, and a space 24 is provided between adjacent conduction portions 23. This space 24 has a length that is substantially the same in the winding axis direction. In other words, the conduction portions 23 are provided at substantially equal intervals.

[0023] The conduction portion 23 is formed such that the length in the lateral direction of the leg portion of the core 1 is the longest on the side in contact with the bottom covering portion 21 and becomes shorter as it approaches the contact portion 22. When viewed from the winding axis direction of the middle leg 11 coil 4, the conduction portion 23 is substantially triangular. That is, the conduction portion 23 has an inclined surface. In other words, when viewing the mold core 3 from the winding axis direction of the coil 4, the mold core 3 has a shape that narrows from the bottom covering portion 21 toward the contact portion 22.

[0024] In this embodiment, the core mold resin 2 has a bottom covering portion 21a, a contact portion 22a, and a conductive portion 23a. The bottom covering portion 21a covers a part of the bottom surface of the yoke portion 13. Specifically, the bottom covering portion 21a covers both ends of the bottom surface of the yoke portion 13 in the direction in which the legs are aligned side by side. In addition, the bottom covering portion 21a covers the edge portion of the bottom surface of the yoke portion 13 on the coil 4 side so as to connect both ends of the bottom surface of the yoke portion 13.

[0025] The contact portion 22a, like the contact portion 22, is in contact with the heat dissipation member 6 that is in contact with the bottom surface of the coil 4. The conductive portion 23a is provided between the bottom surface covering portion 21a and the contact portion 22a, connecting the bottom surface covering portion 21a and the contact portion 22a. Like the conductive portion 23, multiple conductive portions 23a are provided, and a space 24a is provided between each conductive portion 23a. In this embodiment, a part of the bottom surface of the yoke portion 13 is not covered by the core mold resin 2 and is exposed.

[0026] Coil 4 is composed of a single flat, rectangular conductive member insulated with enamel or the like. Coil 4 is formed by winding the conductive member in a cylindrical shape while shifting the winding position in the direction of the winding axis. In this embodiment, it is an edgewise coil made of a flat rectangular copper wire. However, the type of wire and winding method of coil 4 are not limited to this and may be of other forms.

[0027] As shown in Figure 3, the ends of coil 4 are connected to busbar 8, and are electrically connected to external equipment via busbar 8. When power is supplied from the external equipment, current flows through coil 4, generating magnetic flux, which flows into core 1, forming a closed magnetic circuit.

[0028] The bottom surface of the coil 4 is not covered by the secondary molding resin 5 and is exposed. A heat dissipation member 6 is provided on the bottom surface of the coil 4, in contact with the bottom surface of the coil 4. Only one heat dissipation member 6 is provided. In other words, the heat dissipation member 6 is not provided on the bottom surface of the outer leg 12 or the bottom surface of the yoke portion 13. The heat dissipation member 6 releases the heat from the coil 4 to the outside of the reactor 10. As the heat dissipation member 6, for example, an elastic material such as a heat dissipation sheet, heat dissipation grease, or heat dissipation gap filler (a material that is paste-like when applied and becomes sheet-like and elastic when hardened), or a plate-shaped member made of metal such as aluminum can be used. In this embodiment, the shape of the heat dissipation member 6 is generally rectangular (see Figure 5(a)), but it can be any shape. The heat dissipation member 6 may be a component of the reactor 10, or it may not be a component of the reactor 10 but be placed at the installation location of the reactor 10, with the reactor 10 placed on top of it.

[0029] As shown in Figure 3, the secondary molding resin 5 is a resin member that covers the mold core 3 and the coil 4. The mold core 3 and the coil 4 are also integrated when the secondary molding resin 5 is injected into the mold and solidifies. In this embodiment, the secondary molding resin 5 covers the surface of the middle leg 11 of the mold core 3 and the inner circumferential surface of the outer leg 12 and the yoke portion 13. In addition, the secondary molding resin 5 covers the outer and inner surfaces of the coil 4, except for the bottom surface of the coil 4 and the ends of the conductive members that make up the coil 4.

[0030] The resin used for the secondary mold resin 5 can be the same type of resin as that used for the core mold resin 2. While the secondary mold resin 5 and the core mold resin 2 may be composed of different resins, it is preferable to use the same type of resin. Using the same type of resin ensures that the resin shrinkage rates are the same, improving the adhesion between the core mold resin 2 and the secondary mold resin 5, preventing delamination between the two, and suppressing the deterioration of noise and vibration in the reactor 10.

[0031] Covers 7a and 7b are provided on the top and bottom surfaces of the coil 4. Covers 7a and 7b prevent the mold from coming into contact with the coil 4 during molding. Cover 7a is a plate-shaped member that covers the top surface of the coil 4. Cover 7b is a frame-shaped member that covers the edge of the bottom surface of the coil 4. In other words, the bottom surface of the coil 4 is not entirely covered by cover 7a, but is exposed.

[0032] (Effects and Benefits) As described above, the reactor 10 of this embodiment comprises a core 1, a coil 4 mounted on the core 1, and a core mold resin 2 covering the surface of the core 1. A heat dissipation member 6 is provided on the bottom surface of the coil 4, which is in contact with the bottom surface of the coil 4. The core mold resin 2 has a bottom covering portion 21 that covers the bottom surface of the core 1, a contact portion 22 that is in contact with the heat dissipation member 6, and a conductive portion 23 that connects the bottom covering portion 21 and the contact portion 22.

[0033] Conventionally, the heat dissipation member 6 was installed not only on the bottom surface of the coil 4, but also in multiple locations such as the bottom surface of the core. As a result, the process of placing the heat dissipation member 6 had to be performed multiple times, which worsened productivity. In addition, because the heat dissipation member 6 is a high-grade material, it led to increased material costs.

[0034] However, in this embodiment, only one heat dissipation member 6 is placed on the bottom surface of the coil 4. Therefore, the work required to place the heat dissipation member 6 can be reduced, improving the productivity of the reactor 10 and reducing material costs. In addition, the heat from the core 1 is transferred to the heat dissipation member 6 provided on the bottom surface of the coil 4 via the bottom covering portion 21, the conductive portion 23, and the contact portion 22. Therefore, a path for releasing the heat from the core 1 is secured, and the temperature rise of the reactor 10 can be suppressed. Thus, the reactor 10 of this embodiment improves productivity and reduces costs, suppresses temperature rise, and increases heat dissipation efficiency (heat dissipation effect relative to work and cost).

[0035] In particular, the bottom covering portion 21, the contact portion 22, and the conductive portion 23 are molded integrally with the core 1. For example, if the bottom covering portion 21, the contact portion 22, and the conductive portion 23 were molded separately and fixed between the bottom surface of the core 1 and the heat dissipation member 6 with adhesive, a gap may be created between the bottom covering portion 21 and the bottom surface of the core 1 due to the uneven surface of the core 1. In addition, thermal resistance is created by joining with adhesive. As a result, heat transfer performance deteriorates.

[0036] However, in this embodiment, the core 1 and the bottom covering portion 21 are integrally molded by molding, and the bottom covering portion 21 fits into the irregularities on the surface of the core 1 and adheres tightly. Furthermore, the bottom covering portion 21, the contact portion 22, and the conductive portion 23 are formed integrally without seams. Therefore, heat from the core 1 can be transferred to the heat dissipation member 6 without degrading heat transfer performance.

[0037] Furthermore, multiple conduction sections 23 are provided, and spaces 24 are provided between adjacent conduction sections 23, thereby increasing the surface area of ​​the conduction sections 23. For example, if the reactor 10 is installed in a well-ventilated location or in a location where air is supplied to the reactor 10 by a fan, heat can also be dissipated from the conduction sections 23 by air cooling. Therefore, the heat dissipation efficiency can be further increased.

[0038] The conductive portion 23 has an inclined surface that slopes from the bottom covering portion 21 toward the contact portion 22, and the lower part of the molded core 3 narrows inward. This allows for miniaturization of the reactor 10. Furthermore, compared to the case where the conductive portion 23 is not inclined but extends vertically and is formed in a rectangular shape when viewed from the winding axis direction of the coil 4, the amount of resin constituting the core mold resin 2 can be reduced, leading to further cost reductions. Moreover, even with an inclined surface on the conductive portion 23, it has the same heat dissipation effect as when the conductive portion 23 extends vertically. Therefore, the heat dissipation efficiency is further increased.

[0039] The core 1 has a middle leg 11 on which the coil 4 is mounted, a pair of outer legs 12 extending parallel to the middle leg 11 and positioned on either side of the middle leg 11, and a yoke portion 13 connecting the middle leg 11 and the outer legs 12. The core mold resin 2 covers the bottom surfaces of the pair of outer legs 12 on which the coil 4 is not mounted, and the conductive portion 23 connects the contact portion to the bottom surface covering portion 21 that covers the bottom surfaces of the outer legs 12.

[0040] Thus, there are three legs: a middle leg 11 and a pair of outer legs 12. If the coil 4 is mounted only on the middle leg 11, conventionally, in addition to the bottom surface of the coil 4, a maximum of four additional heat dissipation members 6 would be needed: the bottom surfaces of the pair of outer legs 12 and the bottom surfaces of the pair of yoke sections 13. This would lead to further work and increased costs. To prevent worsening work efficiency and increased costs, it is also conceivable to reduce the number of heat dissipation members 6, for example, by placing them only on the bottom surface of the coil 4 and the bottom surfaces of the pair of yoke sections 13. However, in this case, the temperature of the outer legs 12 would rise, potentially degrading the magnetic properties of the reactor 10.

[0041] However, in this embodiment, the conductive part 23 connects the bottom covering part 21 that covers the bottom surface of the outer leg 12 to the contact part 22, and the bottom surface of the outer leg 12 and the bottom surface of the yoke part 13 do not have a heat dissipation member 6 placed thereon. Then, the heat from the outer leg 12 can be released via the conductive part 23 to the heat dissipation member 6 placed on the bottom surface of the coil 4. Thus, it is possible to improve the heat dissipation effect while improving workability and reducing costs.

[0042] Furthermore, the core mold resin 2 has a bottom covering portion 21a that covers a part of the bottom surface of the yoke portion 13, and the conductive portion 23a connects the bottom covering portion 21a to the contact portion 22a. As a result, heat from the core 1 can also be transferred from the yoke portion 13 to the heat dissipation member 6, further improving the heat dissipation performance of the reactor 10.

[0043] Furthermore, a heat dissipation member 6 may be provided separately on the bottom surface of the exposed yoke portion 13. Since the heat from the yoke portion 13 can be released to the heat dissipation member 6 via the conductive portion 23a, the exposed area of ​​the bottom surface of the yoke portion 13 can be reduced. Therefore, the heat dissipation member 6 provided on the bottom surface of the yoke portion 13 only needs to be the size of the exposed bottom surface of the yoke portion 13, making it smaller than when it is positioned to contact the entire bottom surface of the yoke portion 13, thus reducing costs. In addition, since the heat from the core 1 can be released directly from the bottom surface of the yoke portion 13 to the heat dissipation member 6, the heat dissipation effect of the reactor 10 is also improved.

[0044] (Other embodiments) While embodiments of the present invention have been described herein, these embodiments are presented as examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. Embodiments and their variations are included in the scope and essence of the invention, as well as in the claims and their equivalents.

[0045] (1) In this embodiment, multiple conductive parts 23, 23a are provided, and a space 24 is provided between adjacent conductive parts 23, 23a, but the space 24 does not need to be provided. That is, core mold resin 2 may also be poured into the space 24 portion to form a single solid conductive part 23. By making the conductive parts 23, 23a solid, the heat from the core 1 can be transferred more effectively to the heat dissipation member 6, thereby increasing the heat dissipation efficiency.

[0046] (2) The bottom covering portion 21a covered only a part of the bottom surface of the yoke portion 13, but it may cover the entire surface. This allows more heat from the yoke portion 13 to be transferred to the heat dissipation member 6, thereby increasing the heat dissipation efficiency.

[0047] (3) In this embodiment, the reactor 10 is first molded by molding the core 1 with core molding resin 2 to produce a molded core 3 having a bottom covering portion 21, a contact portion 22, and a conductive portion 23, then the coil 4 is assembled to the molded core 3 and integrally molded with secondary molding resin 5. However, the bottom covering portion 21, the contact portion 22, and the conductive portion 23 may be formed by the resin used during secondary molding. That is, first the coil 4 is molded to produce a molded coil, the core 1 is assembled to the molded coil, the bottom covering portion 21, the contact portion 22, and the conductive portion 23 are formed with secondary molding resin 5, and the core 1 and the molded coil are integrally molded. In this case, the secondary molding resin 5 becomes the core molding resin 2 that covers the core 1 of the embodiment.

[0048] (4) In this embodiment, the coil 4 was mounted on the middle leg 11, but the reactor 10 may have two coils 4, each mounted on a pair of outer legs 12, and the coil 4 may not be mounted on the middle leg 11. In this case, two heat dissipation members 6 are provided, and the heat dissipation members 6 are placed on the bottom surface of the coils 4 mounted on each outer leg 12, and the bottom covering portion 21 covers the bottom surface of the middle leg 11. Two contact portions 22 are provided, one of which contacts the heat dissipation member 6 placed on the bottom surface of the coil 4 mounted on one outer leg 12, and the other contact portion 22 contacts the heat dissipation member 6 placed on the bottom surface of the coil 4 mounted on the other outer leg 12. The conduction portion 23 connects the bottom covering portion 21 to one contact portion 22, and the bottom covering portion 21 to the other contact portion 22. As a result, heat from the core 1 can be released from the bottom surface of the middle leg 11 to the two heat dissipation members 6.

[0049] (5) The number of legs of the core 1 does not have to be three. The core 1 may have, for example, two legs formed by joining U-shaped core members. In this case, a coil 4 is attached to one leg, and a coil 4 is not attached to the other leg, and the bottom surface of the leg is covered with a bottom covering portion 21. Then, a conductive portion 23 is extended from the bottom covering portion 21 to a contact portion 22 that contacts the heat dissipation member 6 provided on the bottom surface of the coil 4. This makes it possible to release heat from the core 1 to the heat dissipation member 6 from the bottom surface of the leg that does not have a coil 4 attached.

[0050] (6) The conduction part 23 only needs to have an inclined surface, and its shape when viewed from the winding axis direction of the coil 4 is not limited to being roughly triangular. For example, the shape of the conduction part 23 when viewed from the winding axis direction of the coil 4 may be a trapezoidal shape with the part connected to the bottom covering part 21 as the lower base and the contact part 22 side as the upper base. [Explanation of Symbols]

[0051] 10 Reactors 1 core 2 Core mold resin 21, 21a Bottom cover part 22, 22a contact part 23, 23a Conduction part 24, 24a space 3 mold core 4 coils 5. Secondary molding resin 6 Heat dissipation components 7a, 7b Cover 8 Bus Bar

Claims

1. The core and A coil attached to the aforementioned core, A core mold resin covering the surface of the core, Equipped with, A heat dissipation member is provided that contacts the bottom surface of the coil. The core mold resin is A bottom covering portion that covers the bottom surface of the core, The contact portion that contacts the heat dissipation member, A conductive part connecting the bottom covering portion and the contact portion, It has, The heat dissipation member is provided only on the bottom surface of the coil. The conductive portion has an inclined surface that slopes from the bottom covering portion toward the contact portion, The aforementioned inclined surface is formed to narrow inward. A reactor characterized by the following.

2. The aforementioned core is Multiple legs, A yoke section connecting the aforementioned multiple leg sections, It has, The aforementioned leg portion is The leg portion to which the coil is attached, The leg portion to which the aforementioned coil is not attached, It has, The bottom covering portion covers at least the bottom surface of the leg portion to which the coil is not attached. The aforementioned conductive part connects the bottom covering portion, which covers the bottom surface of the leg portion to which the coil is not attached, to the contact portion. The reactor according to claim 1, characterized by the following:

3. The aforementioned core is Middle leg and, A pair of outer legs extending parallel to the aforementioned middle leg and positioned on either side of the aforementioned middle leg, It has, The coil is attached to the middle leg, The core mold resin covers the bottom surface of the pair of outer legs, The aforementioned conduction portion connects the bottom covering portion that covers the bottom surface of the outer leg and the contact portion. The reactor according to claim 2, characterized by the following:

4. The bottom covering portion covers the bottom surface of the yoke portion, The aforementioned conductive part connects the bottom covering portion that covers the bottom surface of the yoke portion and the contact portion. The reactor according to claim 2 or 3, characterized by the following:

Images