Reactor

Abstract

We provide reactors that improve heat dissipation. [Solution] A reactor 10 installed on a cooling section comprises a core 1, a coil 3 mounted on the core 1, a busbar 5a connected to the lead wires 36 of the coil 3, and a resin member 7 covering at least a portion of the busbar 5a. The busbar 5a extends along the shape of the core 1 at a position close to the lower surface of the reactor 10 and has a core-facing portion 51 facing the core 1. The resin member 7 is formed between the core-facing portion 51 and the core 1.

Description

Technical Field

[0006] , ,

[0005] ,

[0001] The present invention relates to a reactor installed on a cooling part.

Background Art

[0002] Reactors are used in various applications such as OA equipment, solar power generation systems, automobiles, and uninterruptible power supplies. A reactor is an electromagnetic component that converts electrical energy into magnetic energy for storage and release.

[0003] A reactor includes a core and a coil. The core is a magnetic body and has an annular shape. The coil is attached to the core. A lead wire is drawn out from the coil, and the lead wire is connected to a bus bar for electrically connecting to an external device by welding. Power is supplied from the external device to the coil via the bus bar, and the coil generates magnetic flux. The core serves as a magnetic path for the magnetic flux generated by the coil.

Prior Art Documents

Patent Documents

[0007] To achieve the above objective, the reactor of the present invention is a reactor installed on a cooling section, comprising a core, a coil mounted on the core, a busbar connected to the lead wires of the coil, and a resin member covering at least a portion of the busbar, wherein the busbar extends along the shape of the core at a position close to the lower surface of the reactor and has a core-facing portion facing the core, and the resin member is formed between the core-facing portion and the core. [Effects of the Invention]

[0008] According to the present invention, a reactor with improved heat dissipation can be obtained. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing the main components of the reactor. [Figure 2] This is an exploded perspective view showing the main components of the reactor. [Figure 3] This is a core perspective. [Figure 4] This is a perspective view showing the busbar and heat transfer components installed. [Figure 5] This is a perspective view showing the overall configuration of the busbar and heat transfer components. [Figure 6] This is a plan view showing the busbars and heat transfer components installed. [Figure 7] This is a perspective view showing the overall structure of the reactor. [Figure 8] This is a cross-sectional view AA in Figure 7. [Figure 9] This is a magnified cross-sectional view of the opening. [Figure 10] This is an enlarged cross-sectional view of the coil-facing section. [Modes for carrying out the invention]

[0010] [Embodiment] The reactor according to the embodiment will be described with reference to the drawings. In each drawing, thickness, dimensions, positional relationships, ratios, or shape may be emphasized for ease of understanding, and the present invention is not limited to such emphasis.

[0011] Figure 1 is a perspective view showing the main components of reactor 10. Figure 2 is an exploded perspective view showing the main components of reactor 10. The winding axis direction of coil 3 is the X-axis direction as shown in Figures 1 and 2, and the Y-axis direction is the direction in which the middle legs 11 and outer legs 12 of core 1 are aligned. The Z-axis direction is perpendicular to the X-axis and Y-axis directions and is also called the height direction. The direction in which the lead wires 36 of coil 3 shown in Figures 1 and 2 extend is called up, and the opposite direction is called down.

[0012] The reactor 10 (see Figure 7) 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 is installed on a cooling section (not shown). That is, the lower surface of the reactor 10 faces the cooling section. In this embodiment, the cooling section is a cooling device. When the reactor 10 is installed on the cooling section, a gap filler with high thermal conductivity is applied to the lower surface of the reactor 10. As a result, a gap filler is formed between the lower surface of the reactor 10 and the cooling section. The gap filler is also applied to the lower surfaces of the core-facing section 51 and the coil-facing section 52 of the busbar 5a. As a result, a gap filler is also formed between the lower surfaces of the core-facing section 51 and the coil-facing section 52 and the cooling section.

[0013] The reactor 10 comprises a core 1, a core coating resin 2, and a coil 3. The coil 3 is mounted on the core 1. The core 1 is covered with the core coating resin 2, which is formed by molding, and the core 1 and the coil 3 are insulated by the core coating resin 2.

[0014] Core 1 can be a compacted magnetic core, a ferrite core, a laminated steel sheet, or a metal composite core. A metal composite core is a magnetic material formed by mixing magnetic powder and resin, and then hardening the resin.

[0015] Figure 3 is a perspective view of the core 1. As shown in Figure 3, the core 1 has a middle leg 11, outer legs 12, and a yoke portion 13. A pair of outer legs 12 are provided. The middle leg 11 is provided between the pair of outer legs 12. The yoke portion 13 connects the middle leg 11 and the pair of outer legs 12. A pair of yoke portions 13 are provided, and each yoke portion 13 is joined to each end face of the middle leg 11 and the pair of outer legs 12. The core 1 has a substantially θ-shaped annular closed magnetic circuit.

[0016] The core 1 has an outer surface 14. The outer surface 14 is an end face that forms the outer circumference of the core 1, connecting the upper and lower surfaces of the core 1. The outer surface 14 has a leg outer peripheral surface 141, a back surface 142, and a curved surface 143. The leg outer peripheral surface 141 is an end face on the opposite side of the inner peripheral surface 15 of the outer leg 12 facing the middle leg 11. The back surface 142 is a surface on the opposite side of the end face connecting the middle leg 11 and the outer leg 12 among the end faces of the yoke portion 13 orthogonal to the winding shaft. The curved surface 143 is provided at the corner of the yoke portion 13. The curved surface 143 is curved. It is disposed between the leg outer peripheral surface 141 and the back surface 142 and connects the leg outer peripheral surface 141 and the back surface 142.

[0017] The core 1 is formed by joining E-shaped core members 16, 17 and rectangular parallelepiped core members 18, 19. Note that a spacer 4 is provided between the E-shaped core members 16, 17 and the rectangular parallelepiped core members 18, 19. The spacer 4 can be made of a non-magnetic material, ceramic, non-metal, resin, carbon fiber, or a composite material of two or more of these, or gap paper. By interposing the spacer 4, a magnetic gap of a predetermined width is provided to prevent a decrease in the inductance of the reactor 10.

[0018] As shown in Figure 1, the core coating resin 2 covers at least a part of the periphery of the core 1. The core coating resin 2 insulates the core 1 and the coil 3. The core coating resin 2 is formed by molding the core 1 and is integrated with the core 1. However, the core coating resin 2 may be molded separately from the core 1 and assembled to the core 1.

[0019] The core coating resin 2 is composed of a resin, and examples of resin types include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), or composites thereof. Alternatively, a thermosetting resin such as phenolic resin may be used as the core coating resin 2. Furthermore, a thermally conductive filler may be mixed into the resin.

[0020] The core coating resin 2 has a yoke coating portion 21 and an opening 22. The yoke coating portion 21 covers the back surface 142 and the curved surface 143 of the yoke portion 13 of the core 1. The yoke coating portion 21 is shaped to match the shape of the yoke portion 13, and the portion that covers the curved surface 143 of the yoke portion 13 is curved.

[0021] The opening 22 is an opening that forms the yoke covering portion 21. The opening 22 is formed on the back surface 142 of the yoke portion 13. The opening 22 extends to the back surface 142 of the yoke portion 13, and the back surface 142 of the yoke portion 13 is exposed from the opening 22.

[0022] Coil 3 is composed of a single flat, rectangular conductive member insulated with enamel or the like. Coil 3 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 3 are not limited to this and may be of other forms.

[0023] Coil 3 is attached to the legs of core 1. More specifically, coil 3 is attached to the outer legs 12 of core 1. There are four coils 3, with two coils 3 attached to each outer leg 12.

[0024] Coil 3 has an upper surface 31, a lower surface 32, an outer surface 33, and an inner surface 34, and each surface 31 to 34 has a curved, rounded shape. The outer surface 33 and the inner surface 34 are the sides of coil 3 that connect the upper surface 31 and the lower surface 32, the inner surface 34 faces the middle leg 11 of core 1, and the outer surface 33 is the surface opposite to the inner surface 34. Coil 3 also has an annular surface 35 perpendicular to the winding axis.

[0025] Furthermore, from each coil 3, a lead wire 36, which forms the end of the conductive member, is drawn upward from the annular surface 35. Each lead wire 36 is connected to the busbars 5a and 5b (see Figure 4), which will be described later, by welding. The coils 3 are energized via the busbars 5a and 5b and generate magnetic flux.

[0026] Figure 4 is a perspective view showing the busbars 5a and 5b and the heat transfer member 6 installed. Figure 5 is a perspective view showing the overall configuration of the busbars 5a and the heat transfer member 6. As shown in Figures 4 and 5, the reactor 10 comprises the busbars 5a and the heat transfer member 6. The busbars 5a and the heat transfer member 6 are made of a plate-shaped conductive material such as copper. The busbars 5a and the heat transfer member 6 are a single piece formed by bending one conductive material. In other words, the heat transfer member 6 is not molded separately from the busbars 5a and joined together with adhesive or the like.

[0027] The busbar 5a connects to the lead wires 36 of the coil 3 and the terminals of the external device. In this way, power supplied from the external device energizes the coil 3 via the busbar 5a. The busbar 5a has a core-facing portion 51, a coil-facing portion 52, a welded portion 53, and a terminal fastening portion 54.

[0028] The core-facing portion 51 faces the outer surface 14 of the core 1. In this embodiment, the core-facing portion 51 faces the back surface 142 and the curved surface 143 of the yoke portion 13 of the core 1, which are part of the outer surface 14. The core-facing portion 51 extends along the shape of the back surface 142 and the curved surface 143 of the yoke portion 13. The core-facing portion 51 extends from near the center of the back surface 142 of the yoke portion 13 to the corner of the yoke portion 13 and is curved to follow the curved surface 143 of the corner of the yoke portion 13.

[0029] A small gap is formed between the core-facing portion 51 and the yoke covering portion 21 that covers the yoke portion 13. This small gap is sufficient to allow the molten resin that will become the resin member 7 to enter when the coil 3, etc., described later, is molded.

[0030] The core-facing portion 51 is positioned close to the lower surface of the reactor 10. "Close to the lower surface of the reactor 10" means that, when the back surface 142 of the yoke portion 13 is divided into four equal parts in the height direction, at least the lower surface of the core-facing portion 51 is included in the lowest of the four divisions.

[0031] The length of the core-facing portion 51 is more than half of the total height of the back surface 142 of the yoke portion 13. In other words, the core-facing portion 51 covers more than half of the height of the back surface 142 of the yoke portion 13. Furthermore, the core-facing portion 51 covers the opening 22. In other words, the core-facing portion 51 faces the back surface 142 of the yoke portion 13 that is exposed from the opening 22.

[0032] The coil-facing portion 52 faces the outer surface 33 of the coil 3. The coil-facing portion 52 is positioned close to the lower surface of the reactor 10. The lower surface of the coil-facing portion 52 is at the same height as the lower surface of the core-facing portion 51.

[0033] The coil-facing portion 52 extends parallel to the winding axis. The coil-facing portion 52 is longer than the length of the outer surface 33 of one coil 3 in the winding axis direction. The coil-facing portion 52 faces the outer surface 33 of the coil 3 from one annular surface 35 to the other annular surface 35. A connecting portion 55 is provided between the coil-facing portion 52 and the core-facing portion 51, and the coil-facing portion 52 and the core-facing portion 51 are connected by the connecting portion 55.

[0034] The welded joint 53 is connected to the lead wire 36 of the coil 3 by welding. The welded joint 53 extends upward while in contact with the annular surface 35 of the coil 3. The tip surface of the welded joint 53 is flush with the tip surface of the lead wire 36 of the coil 3, and their respective tip surfaces are welded together.

[0035] The terminal fastening portion 54 connects to the terminal of an external device. The terminal fastening portion 54 is located on the back side 142 of the yoke portion 13. The terminal fastening portion 54 extends upward from the upper end of the core facing portion 51 to the same height as the core facing portion 61 of the heat transfer member 6, which will be described later, then curves 90 degrees away from the yoke portion 13 and extends outward. The terminal of the external device is inserted into this extended tip.

[0036] The heat transfer member 6 is a member that transfers heat from the core 1 and coil 3 to the bus bar 5a. The heat transfer member 6 has a core-facing portion 61, a connecting portion 62, an annular-surface-facing portion 63, and an upper-surface-facing portion 64.

[0037] The core-facing portion 61 faces the upper surface of the yoke portion 13. A core-coating resin 2 is interposed between the core-facing portion 61 and the upper surface of the yoke portion 13, and the core-facing portion 61 is in contact with the yoke-coating portion 21 that covers the upper surface of the yoke portion 13.

[0038] The connecting portion 62 connects the core-facing portion 61 to the core-facing portion 51 of the busbar 5a. The connecting portion 62 extends from the upper surface to the back surface 142 of the yoke portion 13. Both the connecting portion 62 and the terminal fastening portion 54 are provided on the back surface 142 side of the yoke portion 13. That is, the connecting portion 62 and the terminal fastening portion 54 are located on the same side of the reactor 10. It is preferable that the connecting portion 62 and the terminal fastening portion 54 be located in close proximity on the same side of the reactor 10. Close proximity means that, as shown in Figure 6, at least a portion of both the connecting portion 62 and the terminal fastening portion 54 are located within the extension region R in the winding axis direction of the coil 3. The extension region R refers to the region between the outer surface 33 and the inner surface 34 of the coil 3, that is, the extended region of the annular surface 35 of the coil 3 in the winding axis direction.

[0039] The annular surface facing portion 63 is connected to the core facing portion 61. The annular surface facing portion 63 faces the annular surface 35 of the coil 3. The annular surface facing portion 63 faces the annular surface 35 of the coil 3 on the upper surface 31 side. A small gap is provided between the annular surface facing portion 63 and the annular surface 35 of the coil 3.

[0040] The upper surface facing portion 64 is connected to the annular surface facing portion 63. The upper surface facing portion 64 faces the upper surface 31 of the coil 3. The upper surface facing portion 64 faces more than half the area of ​​the upper surface 31 of the coil 3. A small gap is provided between the upper surface facing portion 64 and the upper surface 31 of the coil 3.

[0041] In this embodiment, the reactor 10 includes a busbar 5b in addition to the busbar 5a. The busbar 5b is provided on the upper surface of the yoke portion 13. The busbar 5b does not have a core-facing portion 51 or a coil-facing portion 52.

[0042] Similar to busbar 5a, a heat transfer member 6 is integrally connected to busbar 5b. However, the area of ​​the core-facing portion 61 of the heat transfer member 6 connected to busbar 5b is larger than the area of ​​the core-facing portion 61 of the heat transfer member 6 connected to busbar 5a. The core-facing portion 61 of the heat transfer member 6 connected to busbar 5a and the core-facing portion 61 of the heat transfer member 6 connected to busbar 5b cover more than 70% of the upper surface of the yoke portion 13. In addition, the core-facing portion 61 of the heat transfer member 6 connected to busbar 5b faces a portion of the upper surface of the middle leg 11.

[0043] Figure 7 is a perspective view showing the overall configuration of the reactor 10. As shown in Figure 7, the coil 3 and busbars 5a and 5b are fixed by a resin member 7 formed from solidified molded resin. In other words, parts of the coil 3 and busbars 5a and 5b are embedded in the resin member 7.

[0044] The resin component 7 is made of resin. Examples of resins that make up the resin component 7 include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), or composites thereof. Alternatively, a thermosetting resin such as phenolic resin may be used as the resin for the resin component 7. A thermally conductive filler may be mixed into the resin, and it is preferable that the resin component 7 uses a resin with higher thermal conductivity than the core coating resin 2.

[0045] The resin member 7 covers the coil 3, busbars 5a and 5b, and a portion of the heat transfer member 6. The resin member 7 has a core-facing portion 51, a coil-facing portion 52, a core-facing portion 61, a connecting portion 62, an annular surface-facing portion 63, and an upper surface-facing portion 64 embedded within it.

[0046] Figure 8 is a cross-sectional view of Figure 7, AA. As shown in Figure 8, the resin member 7 is formed between the core-facing portion 51 of the busbar 5a and the back surface 142 of the yoke portion 13, between the annular surface-facing portion 63 and the annular surface 35 of the coil 3, and between the upper surface-facing portion 64 and the upper surface 31 of the coil 3.

[0047] Figure 9 is an enlarged cross-sectional view of the opening 22. As shown in Figure 9, the resin member 7 is formed inside the opening 22 and is in contact with the back surface 142 of the yoke portion 13. That is, the resin member 7 connects the back surface 142 of the yoke portion 13 and the core-facing portion 51 of the busbar 5a. Figure 10 is an enlarged cross-sectional view of the coil-facing portion 52. As shown in Figure 10, the resin member 7 is formed between the coil-facing portion 52 and the outer surface 33 of the coil 3.

[0048] The reactor 10, configured as described above, is mounted on a cooling device. The cooling device is shaped to match the bottom surface of the reactor 10, and a gap filler is applied to the bottom surface of the reactor 10 to fill the space between the bottom surface of the reactor 10 and the cooling device. As a result, the heat from the reactor 10 is efficiently dissipated to the cooling device via the gap filler.

[0049] [Effects and Effects] As described above, the reactor 10 of this embodiment comprises a core 1, a coil 3 mounted on the core 1, a busbar 5a connected to the lead wires 36 of the coil 3, and a resin member 7 covering at least a portion of the busbar 5a. The busbar 5a has a core-facing portion 51 facing the core 1, the core-facing portion 51 extends along the outer surface 14 of the core 1, which is close to the lower surface of the reactor 10 facing the cooling portion, and the resin member 7 is formed at least between the core-facing portion 51 and the core 1.

[0050] When power is supplied to the reactor 10, the core 1 and coil 3 generate heat. The heat generated from the core 1 is transferred to the core-facing portion 51 via the core coating resin 2 and resin member 7. Since the core-facing portion 51 is located close to the lower surface of the reactor 10, that is, close to the cooling portion, the heat transferred to the core-facing portion 51 is dissipated to the cooling portion. Therefore, the heat dissipation performance of the reactor 10 is improved.

[0051] In this embodiment, a gap filler is applied to the lower surface of the core-facing portion 51. Therefore, heat transferred to the core-facing portion 51 is easily dissipated to the cooling portion via the gap filler. Thus, the heat dissipation performance of the reactor 10 is improved.

[0052] In particular, in this embodiment, the core coating resin 2 is formed by mold molding and covers the periphery of the core 1. If the core coating resin 2 were formed as a separate component and assembled to the core 1, a gap would be created between the core coating resin 2 and the core 1. However, in this embodiment, since the core coating resin 2 is formed by mold molding, the core 1 and the core coating resin 2 are in close contact. Therefore, heat from the core 1 is easily transferred to the core coating resin 2, improving the heat dissipation of the reactor 10.

[0053] The heat transfer member 6 further comprises a connecting portion 62 that connects to the core-facing portion 51 of the busbar 5a. The heat transfer member 6 has a core-facing portion 61 that faces the core 1, an annular-surface-facing portion 63 that faces the coil 3, and an upper-surface-facing portion 64. The resin member 7 is formed between the core 1 and coil 3 and the core-facing portion 61, annular-surface-facing portion 63, and upper-surface-facing portion 64.

[0054] This allows heat from the core 1 to be transferred to the core-facing portion 61. The heat transferred to the core-facing portion 61 is then transferred to the core-facing portion 51 of the busbar 5a via the connecting portion 62 and dissipated to the cooling portion. In addition, heat from the coil 3 is transferred to the annular-face-facing portion 63 and the upper-face-facing portion 64. The heat transferred to the annular-face-facing portion 63 and the upper-face-facing portion 64 is then transferred to the core-facing portion 61, and further transferred to the core-facing portion 51 of the busbar 5a via the connecting portion 62 and dissipated to the cooling portion. As a result, the heat dissipation performance of the reactor 10 is improved.

[0055] Furthermore, the heat transfer member 6, which has a core-facing portion 61, an annular-surface-facing portion 63, and an upper-surface-facing portion 64, is made of the conductive material that constitutes the busbar 5a and is molded as an integral part with the busbar 5a. Therefore, there is no adhesive or other material interposed between the heat transfer member 6 and the busbar 5a. As a result, heat from the core 1 and coil 3 can be efficiently transferred from the heat transfer member 6 to the busbar 5a.

[0056] Furthermore, in this embodiment, the annular surface facing portion 63 is provided on the upper surface 31 side of the annular surface 35 of the coil 3, and the upper surface facing portion 64 is provided on the upper surface 31 of the coil 3. Since a cooling portion is installed on the lower surface of the reactor 10, heat from the lower surface 32 of the coil 3 is easily dissipated to the cooling portion, but heat from the upper surface 31 side of the coil 3 is difficult to dissipate to the cooling portion. Therefore, the annular surface facing portion 63 and the upper surface facing portion 64 absorb the heat from the upper surface 31 side of the coil 3, and the absorbed heat is dissipated to the cooling portion using the connecting portion 62 and the core facing portion 51 of the busbar 5a as a heat dissipation path. As a result, heat from the upper surface 31 side of the coil 3 can be effectively dissipated to the cooling portion, and the heat dissipation performance of the reactor 10 is improved.

[0057] The busbar 5a further includes a terminal fastening portion 54 for connecting to the terminals of an external device, and the terminal fastening portion 54 and the connecting portion 62 are located on the same side of the reactor 10 and in close proximity. Since the terminals of the external device do not generate heat, heat can also be dissipated from the terminals of the external device. If the terminal fastening portion 54 and the connecting portion 62 were not located on the same side of the reactor 10, the distance between the connecting portion 62 and the terminal fastening portion 54 would become longer. However, in this embodiment, the terminal fastening portion 54 and the connecting portion 62 are located on the same side of the reactor 10 and in close proximity. Therefore, the heat dissipation path from the connecting portion 62 to the terminal fastening portion 54 is shortened, and the heat absorbed by the core facing portion 51, the annular surface facing portion 63, and the upper surface facing portion 64 can be efficiently transferred to the terminal fastening portion 54.

[0058] The core-facing portion 51 has a length of more than half the total length in the height direction of the yoke portion 13 of the opposing core 1. In other words, the area in which the core-facing portion 51 faces the back surface 142 of the yoke portion 13 is large. Therefore, the core-facing portion 51 can efficiently absorb heat from the yoke portion 13 and effectively dissipate heat to the cooling portion.

[0059] The core 1 further comprises a core covering resin 2 that covers the yoke portion 13, and the core covering resin 2 has an opening 22 that exposes the back surface 142 of the yoke portion 137. The core opposing portion 51 is positioned to cover the opening 22 and faces the back surface 142 of the yoke portion 13, and the resin member 7 enters the opening 22 and is in contact with the back surface 142 of the yoke portion 13.

[0060] This allows the heat from the core 1 to be transferred to the core-facing portion 51 solely by the resin member 7. As a result, the heat dissipation of the reactor 10 is improved compared to the case where the core coating resin 2 is interposed. This effect is particularly pronounced when the resin member 7 is made of a resin with higher thermal conductivity than the core coating resin 2.

[0061] [Examples] Reactors for the example and comparative example were fabricated and their heat generation was measured. The reactor for the example comprises a forward portion 51 and a coil-facing portion 52. The reactor for the example also includes a busbar 5b. On the other hand, the reactor for the comparative example was fabricated using the same configuration and procedure as the reactor for the example, except that it does not include busbars 5a and 5b.

[0062] The heat generated by the reactors in the examples and comparative examples was measured by analysis. The analysis was performed using SolidWorks software from SolidWorks Inc. The analysis conditions included a 220W power loss in the coil and a 0W power loss in the core, and the heat generated was analyzed. The analysis results are shown in Table 1.

[0063] [Table 1]

[0064] As shown in Table 1, the reactor in the example showed a 20°C lower coil temperature and a 10°C lower core temperature compared to the reactor in the comparative example. Therefore, it was confirmed that the reactor in the example had improved heat dissipation.

[0065] [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.

[0066] In the above embodiment, the resin member 7 was formed by mold molding and was located between the core-facing portion 51 and the back surface 142 of the yoke portion 13, between the annular surface-facing portion 63 and the annular surface 35 of the coil 3, and between the upper surface-facing portion 64 and the upper surface 31 of the coil 3, but is not limited to this. The reactor 10 may also have a case in which the core 1, coil 3 and busbar 5a are housed, and a filler material is filled into the case. In this case, the busbar 5a is held by a terminal block. The resin member 7 is made of solidified filler material, and this solidified resin member 7 may be located between the core-facing portion 51 and the back surface 142 of the yoke portion 13, between the annular surface-facing portion 63 and the annular surface 35 of the coil 3, and between the upper surface-facing portion 64 and the upper surface 31 of the coil 3. Even in such an embodiment, the effect of improved heat dissipation by the core-facing portion 51 of the busbar 5a and the heat transfer member 6 can be obtained.

[0067] The lower surface of the core-facing portion 51 may be flush with the lower surface of the yoke portion 13 or may protrude further than the lower surface of the yoke portion 13. This shortens the distance between the busbar 5a and the cooling portion, thereby improving the heat dissipation of the reactor 10.

[0068] In the above embodiment, the busbar 5b did not have a core-facing portion 51 and a coil-facing portion 52, but the busbar 5b may be provided with a core-facing portion 51 and / or a coil-facing portion 52. This allows heat from the core 1 and coil 3 to be transferred to the cooling section via the busbar 5b, further improving the heat dissipation performance of the reactor 10.

[0069] In the above embodiment, the cooling unit was a cooling device, but it may also be the housing or heat dissipation fins on which it is installed. Furthermore, instead of applying the gap filler to the lower surface of the reactor 10, a cooling sheet, thermal grease, or thermal adhesive may be used. [Explanation of Symbols]

[0070] 10 Reactors 1 core 11 Middle legs 12 Outer legs 13 York 14 External surface 141 Leg outer circumferential surface 142 Back 143 Curved surface 15 Inner surface 16, 17 E-shaped core members 18, 19 Rectangular parallelepiped core members 2 Core coating resin 21 Yoke covering 22 Opening 3 coils 31 Top side 32 Bottom surface 33 External surface 34 Inner surface 35 Annular surface 36. Leading Line 4 Spacers 5a, 5b busbar 51 Core opposing section 52 Coil-facing section 53 Welded section 54 Terminal fastening section 6 Heat transfer components 61 Core opposing section 62 Connecting part 63 Annular surface facing portion 64 Upper opposing part 7 Resin components

Claims

1. A reactor installed on the cooling section, The core and A coil attached to the aforementioned core, A busbar connected to the aforementioned coil, A resin member covering at least a portion of the busbar, Equipped with, The busbar has a core-facing portion that faces the core, The core-facing portion extends along the outer surface of the core, which is close to the lower surface of the reactor facing the cooling portion. The resin member is formed at least between the core-facing portion and the core. A reactor characterized by the following.

2. The heat transfer member further comprises a connecting portion that connects to the core-facing portion, The heat transfer member has a portion facing at least one of the core and the coil, The resin member is formed between at least one of the core and the coil and the opposing portion. The reactor according to claim 1, characterized by the following:

3. The busbar further comprises a terminal fastening portion for connecting to the terminals of an external device. The terminal fastening portion and the connecting portion are provided on the same side of the reactor and in close proximity to each other. The reactor according to claim 2, characterized by the following:

4. The core-facing portion has a length of at least half the total length in the height direction of the opposing core. A reactor according to any one of claims 1 to 3, characterized by the following:

5. The core has a plurality of legs and a yoke portion connecting the legs, The core further comprises a core covering resin that covers the yoke portion of the core, The core coating resin has an opening that exposes the back surface of the yoke portion, The core-facing portion is positioned to cover the opening and faces the back surface of the yoke portion. The resin member is positioned inside the opening and in contact with the back surface of the yoke portion. A reactor according to any one of claims 1 to 3, characterized by the following:

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