Reactor

Abstract

To provide a space-saving reactor with a terminal block and a fixed point.SOLUTION: A core 3 of a reactor 1 includes a first leg 31 and a second leg 32 extending in parallel, and three or more third legs 33 extending across the first leg 31 and the second leg 32, and the plurality of coils 2 are mounted on the first leg 31 so as to be separated by a middle leg 34 sandwiched between the other third legs 33 on both sides of third legs 33. A portion of the terminal block 5 of a fixing point 7 is adjacent to an intermediate point 32c where the second leg 32 and the intermediate leg 34 are connected, and a fastening hole 51 is arrange so as to extend along the intermediate leg 34.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a reactor. [Background technology]

[0002] A reactor mainly consists of a coil and a core. When electricity is passed through the coil, it generates magnetic flux according to the number of turns. The core acts as a closed magnetic circuit that allows the magnetic flux generated by the coil to pass through with a magnetic permeability higher than that of a vacuum. In other words, a reactor is an electromagnetic component that converts electrical energy into magnetic energy and stores and releases it.

[0003] Such reactors are used in a wide variety of applications, and representative examples include boost reactors, series reactors, parallel reactors, current limiting reactors, starting reactors, shunt reactors, neutral point reactors, and arc suppression reactors.

[0004] Boost reactors are incorporated into on-board boost circuits such as those used in the drive systems of hybrid and electric vehicles. Series reactors are connected in series to motor circuits to limit the current during short circuits. Parallel reactors stabilize the current sharing between parallel circuits. Current-limiting reactors limit the current during short circuits and are connected to them. Starting reactors are connected in series to motor circuits to protect the machine and limit the starting current. Shunt reactors are connected in parallel to transmission lines to compensate for leading reactive power and suppress abnormal voltages. Neutral reactors are connected between the neutral point and the ground to limit the ground fault current that flows in the event of a ground fault in the power system. Arc-suppression reactors automatically extinguish the arc that occurs when a single-line ground fault occurs in a three-phase power system.

[0005] The reactor includes a bus bar, which is a plate-shaped conductive member, and a terminal block in order to mount the coil of the reactor on a circuit. A nut is disposed on the terminal block. The bus bar has one end welded to a conductive wire drawn from the coil, and the other end has a tongue portion with a fastening hole formed therethrough. The terminal of the external device and the tongue portion of the bus bar are fixed to the terminal block by fasteners such as nuts and bolts, thereby being electrically connected. The reactor also includes a fixing point in order to fix the reactor body, which is an integrated body of the coil and the core, to a circuit or a case. The fixing point has a fastening hole, and is fixed to the circuit or the case by fasteners such as nuts and bolts. In this way, the reactor is mounted on the circuit. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6426798 [Patent Document 2] Patent No. 6177522 Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, as is evident in automotive applications, the integration of circuit components in a limited mounting area has progressed rapidly, and further space-saving reactors are expected. However, because terminal blocks and fixing points have traditionally been placed outside the envelope surrounding the reactor coil and core, when the reactor is projected in the depth direction of the fastening hole of the terminal block or fixing point, the reactor takes up a larger mounting area by the amount of the terminal block or fixing point.

[0008] The present invention has been proposed to solve the above-mentioned problems, and an object of the present invention is to provide a space-saving reactor that is provided with a terminal block and a fixing point. [Means for solving the problem]

[0009] In order to achieve the above object, a reactor according to an embodiment of the present invention comprises a plurality of coils wound with conductive wire, a core on which the plurality of coils are attached, a terminal block having a fastening hole for electrically connecting a terminal outside the reactor and the coils, and a fixing point having a fastening hole for fixing the core on which the coils are attached, the core having a first leg and a second leg extending in parallel, and three or more third legs extending between the first leg and the second leg, the plurality of coils are attached to the first leg, separated by a middle leg of the third legs that is sandwiched between other third legs on both sides, and a portion of the terminal block and the fixing point are adjacent to a point where the second leg and the middle leg are connected, and the fastening hole is arranged so as to extend along the middle leg.

[0010] The terminal block and another part of the fixing point may be arranged adjacent to a point where an outer leg of the third leg, which has no other third legs on one side, is connected to the second leg, and the fastening hole extends along the outer leg.

[0011] The terminal block may be provided with a core coating resin that covers the core, the terminal block and the fixing point may extend continuously without joints from the core coating resin, two or more terminal blocks and one or more fixing points may be arranged side by side in a straight line, the fixing point located on the straight line may be located in a specified direction relative to the terminal block located on the straight line, and the specified direction may be a direction of 90 degrees clockwise from the reference point based on the direction from the extended base end of the terminal block located on the straight line to the far end away from the core coating resin.

[0012] The terminal block may include a bus bar having one end wired to the terminal block and the other end welded to the conductive wire pulled out from the coil, the conductive wire pulled out from the coil and the bus bar being pulled out in the specified direction based on the terminal block, the conductive wire pulled out from the coil being disposed farther from the terminal block than the bus bar, and the bus bar being disposed closer to the terminal block than the conductive wire pulled out from the coil.

[0013] The terminal block may include a bus bar having one end wired to the terminal block and the other end welded to the conductive wire drawn from the coil, the conductive wire drawn from the coil and the bus bar being drawn in a specified direction based on the terminal block, the specified direction being a direction 90 degrees clockwise from a reference point in a direction from an extended base end of the terminal block to a remote end away from the core, the conductive wire drawn from the coil being disposed farther from the terminal block than the bus bar, and the bus bar being disposed in a position closer to the terminal block than the conductive wire drawn from the coil.

[0014] The coil may include a case that houses the coil and the core so that the first leg is positioned on the bottom side of the case, and a filler that is filled and solidified inside the case that houses the coil and the core until at least the entire coil is buried. Effect of the Invention

[0015] According to the present invention, at least one of the terminal block and the fixed point of the reactor can be disposed between the two coils and fits within the envelope of the coils and the core, thereby saving space in the reactor. [Brief description of the drawings]

[0016] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3]FIG. 4 is a top view of the reactor, showing the positional relationship between the terminal block and the fixed point. [Figure 4] FIG. 2 is a perspective view of a reactor, illustrating the positional relationship between a conductive wire drawn from a coil and a bus bar. [Diagram 5] FIG. 2 is a top view of the reactor, showing the positional relationship between the terminal block, the fixed point, and the coil. [Figure 6] FIG. 4 is a stress distribution diagram showing stress generated at various points on the terminal block. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, a reactor according to an embodiment of the present invention will be described with reference to the drawings. In each drawing, thickness, dimensions, positional relationship, ratio, shape, and the like may be emphasized for ease of understanding, but the present invention is not limited to such emphasis.

[0018] (composition) Fig. 1 is a perspective view of the reactor of this embodiment. As shown in Fig. 1, the reactor 1 includes two coils 2, 2 and one core 3. The two coils 2, 2 are fitted into the core 3. The coils 2, 2 generate magnetic flux according to the number of turns when current is applied. The core 3 becomes a closed magnetic circuit that passes the magnetic flux generated by the coils 2, 2 according to a magnetic permeability higher than that of a vacuum. In other words, the reactor 1 is an electromagnetic component that converts electric energy into magnetic energy and stores and releases the energy.

[0019] The coil 2 is a winding body in which a conductive wire 22 is wound into a cylindrical shape. The conductive wire 22 is, for example, a copper wire, and is coated with an insulating coating such as enamel coating. The conductive wire 22 is a rectangular wire having one wide surface and a narrow surface perpendicular to the wide surface. The coil 2 is formed by winding the conductive wire 22 in a spiral shape by edgewise or flatwise winding while shifting the winding position for each turn along the winding axis. The conductive wire 22 is drawn out from the start and end of the coil 2.

[0020] The core 3 is a closed ring-shaped magnetic body. Examples of the magnetic body include a dust core, a ferrite core, a metal composite core, and a laminated steel plate. The dust core is a powder compact obtained by compressing magnetic powder and annealing it. The magnetic powder is mainly composed of iron, and examples of the magnetic powder include pure iron powder, permalloy (Fe-Ni alloy) mainly composed of iron, Si-containing iron alloy (Fe-Si alloy), sendust alloy (Fe-Si-Al alloy), amorphous alloy, nanocrystalline alloy powder, and a mixture of two or more of these powders. The metal composite core is a core formed by kneading magnetic powder and resin and molding them.

[0021] The core 3 is covered with a core coating resin 4. The two coils 2 are fitted into the core 3 from above the core coating resin 4. The core coating resin 4 protects the core 3 from mechanical shock and insulates the coils 2 from the core 3. That is, the core coating resin 4 has insulating and heat-resistant properties, and examples of the core coating resin 4 include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), and composites of these. A thermally conductive filler may be mixed into the core coating resin 4.

[0022] The fixing points 7 and terminal block 5 extend seamlessly from the core coating resin 4 by integral molding. The fixing points 7 have fastening holes 71 into which fasteners such as bolts and screws are screwed, and the core 3 into which the coil 2 is fitted is attached to another location and fixed in position. The terminal block 5 is a connection point for wiring a terminal of an external device to electrically connect the reactor 1 to an external circuit. This terminal block 5 has fastening holes 51 into which fasteners such as bolts and screws are screwed, and in addition to the terminal block 5, a bus bar 6 provided in the reactor 1 and a terminal of an external device are attached.

[0023] The bus bar 6 is a linear portion 61 which is a long plate of a conductor such as copper, and one end of the linear portion 61 is formed into a tongue portion 62 which is expanded to a wide width. The other end of the linear portion 61 is welded to the conductive wire 22 drawn out from the coil 2. The tongue portion 62 is disposed on the terminal block 5. As a result, the coil 2 is electrically connected to the circuit via the terminal block 5 and the bus bar 6, and is supplied with current from the outside.

[0024] Fig. 2 is a cross-sectional view of the reactor 1. As shown in Fig. 2, the core 3 has a columnar or plate-like first leg 31 and a second leg 32 extending in parallel with a gap therebetween. Furthermore, the core 3 has three columnar or plate-like third legs 33 spanning between the first leg 31 and the second leg 32. The three third legs 33 extend in parallel with a gap therebetween, with one end connected to the first leg 31 and the other end connected to the second leg 32.

[0025] Of the third legs 33, an outer leg 35, which has no other third legs 33 on one side, is hung over the ends of the first leg 31 and the second leg 32 so that the first leg 31 and the second leg 32 do not protrude. Of the third legs 33, a middle leg 34, which is sandwiched between the other third legs 33 on both sides, is hung on the inside of the first leg 31 and the second leg 32.

[0026] That is, the core 3 has a general θ shape in which two ring shapes are connected together. The third leg 33 may be connected to the first leg 31 and the second leg 32 in a manner such that they are seamlessly connected in one piece by integral molding, or the end of the third leg 33 may be in contact with the first leg 31 or the second leg 32, or the end of the third leg 33 may be adjacent to the first leg 31 or the second leg 32 with a gap therebetween.

[0027] This core 3 is formed by butting together a T-shaped core block 36 in which a first leg 31 and a middle leg 34 are connected in a single piece without a joint, and a C-shaped core block 36 in which a second leg 32 and two outer legs 35 are connected in a single piece without a joint. The core block 36 may be a seamless, integrally molded magnetic body, a composite in which smaller magnetic body blocks are connected with an adhesive or the like, or a composite in which gaps are inserted between the smaller magnetic body blocks.

[0028] The core coating resin 4 covers the two core blocks 36 separately. However, the core coating resin 4 exposes a portion of the first leg 31 that faces the extending tip of the outer leg 35 extending from the second leg 32, and also exposes the extending tip of the outer leg 35 extending from the second leg 32. The first leg 31 and the outer leg 35 are connected by contacting each other at the exposed portions. On the other hand, the core coating resin 4 exposes the extending tip of the middle leg 34 extending from the first leg 31, but covers the entire second leg 32. Therefore, the middle leg 34 and the second leg 32 are close to each other with the core coating resin 4 sandwiched therebetween.

[0029] For this core 3, all the coils 2 are fitted into the first leg portions 31. The fitting positions of the coils 2 are divided by the middle leg portions 34. Specifically, the first coil 2 is fitted into the portion of the first leg portion 31 extending between one of the outer leg portions 35 and the middle leg portion 34, and the second coil 2 is fitted into the portion of the first leg portion 31 extending between the other outer leg portion 35 and the middle leg portion 34.

[0030] 3 is a top view of the reactor 1, showing the positional relationship between the terminal block 5 and the fixed point 7. Since there is no coil 2 on the second leg 32 side, there is a space around the second leg 32. Therefore, the terminal block 5 and the fixed point 7 are divided into two sets, and each set is arranged on both sides of the second leg 32 along the second leg 32.

[0031] One of the terminal blocks 5 or the fixing points 7 extends from the core covering resin 4 so as to be adjacent to the middle portion 32c where the second leg 32 and the middle leg 34 are connected. One of the terminal blocks 5 or the fixing points 7 arranged adjacent to this middle portion 32c has a fastening hole 51 or a fastening hole 71 extending along the middle leg 34, and a partial area of ​​the peripheral surface of the terminal block 5 or the fixing point 7 is connected to the core covering resin 4 along the fastening hole 51 or the fastening hole 71.

[0032] The remaining terminal blocks 5 and fixing points 7 extend from the core covering resin 4 so as to be adjacent to the edge portion 32e where the second leg 32 and the outer leg 35 are connected. The terminal blocks 5 and fixing points 7 arranged adjacent to these edge portions 32e are also arranged so that the fastening holes 51 or fastening holes 71 are parallel to the terminal blocks 5 or fixing points 7 arranged adjacent to the middle portion 32c, the fastening holes 51 and fastening holes 71 extend along the outer leg 35, and a partial area of ​​the circumferential surface of the terminal blocks 5 or fixing points 7 is connected to the core covering resin 4 along the fastening holes 51 and fastening holes 71.

[0033] The fixed points 7 and terminal blocks 5 arranged on the same side of the second leg 32 are arranged side by side on a straight line L along the second leg 32. Here, the fixed points 7 and the terminal blocks 5 are arranged side by side such that when the same set of fixed points 7 and terminal blocks 5 arranged side by side on the same straight line L are placed in front and the second leg 32 is placed in the back, the fixed points 7 are present on the left side of each terminal block 5.

[0034] That is, the direction from the extending base end 52 of the terminal block 5 extending from the core coating resin 4 to the farthest end 53 from the core coating resin 4 is defined as the reference direction D1. In other words, the reference direction D1 is perpendicular to the second leg 32 and is a direction away from the second leg 32 along the direction in which the terminal block 5 protrudes from the core coating resin 4. The direction 90 degrees to the right or clockwise from the reference direction D1 is defined as the specified direction D2. In this case, the fixed point 7 aligned on the same straight line L as the terminal block 5 based on the terminal block 5 is located on the side of the specified direction D2.

[0035] The reactor 1 of this embodiment includes four terminal blocks 5 for electrically connecting both ends of the two coils 2, and also includes two fixed points 7. One fixed point 7 and two terminal blocks 5 form a set, and each set is disposed separately on both sides of the second leg 32. One of the terminal blocks 5 of each set is disposed adjacent to the two middle locations 32c. The fixed point 7 is disposed adjacent to the left edge location 32e, and the remaining terminal block 5 is disposed adjacent to the right edge location 32e.

[0036] According to this rule, the fixed points 7 are arranged at the left edge portion 32e so that the fixed points 7 are present on the left side of all the terminal blocks 5. Even if there are multiple fixed points 7 in the same set, one of the multiple fixed points 7 is arranged at the left edge portion 32e.

[0037] FIG. 4 is a perspective view of the reactor 1, showing the positional relationship between the conductive wire 22 drawn from the coil 2 and the busbar 6. As shown in FIG. 4, the conductive wire 22 drawn from the coil 2 and the linear portion 61 of the busbar 6 connected to the conductive wire 22 are both arranged on the specified direction D2' side with respect to the terminal block 5 on which the tongue portion 62 of the busbar 6 is placed. When the direction from the extension base end 52 of the terminal block 5 to the farthest end 53 with respect to the core 3 is set as the reference direction D1', the specified direction D2' is a direction of 90 degrees rightward or clockwise from the reference direction D1'. The conductive wire 22 is arranged at a position farther in the specified direction D2' with respect to the terminal block 5 than the linear portion 61 of the busbar 6. The busbar 6 is also arranged at a position closer in the specified direction D2' with respect to the terminal block 5 than the welded conductive wire 22.

[0038] (Action and effect) 5 is a top view of the reactor 1, showing the positional relationship between the terminal block 5, the fixed point 7, and the coil 2. In this reactor 1, the coil 2 is fitted biased toward the first leg 32 side of the core 3, and the coil 2 does not reach the second leg 32 side, resulting in a space around the second leg 32. Therefore, as shown in FIG. 5, the terminal block 5 can be disposed adjacent to the middle part 32c where the second leg 32 and the middle leg 34 are connected.

[0039] The middle portion 32c is located on an extension region obtained by extending the region sandwiched between the two coils 2 along the extension direction of the middle leg portion 34 or the fastening hole 51. Therefore, when the reactor 1 is projected along the middle leg portion 34 or the fastening hole 51, the terminal block 5 arranged at the middle portion 32c is arranged between the two coils 2 in the projected region. Therefore, most of the terminal block 5 at the middle portion 32c is contained inside the envelope of the coil 2 and the core 3. Such a reactor 1 saves space by the projected area of ​​the terminal block 5 or the fixed point 7 arranged adjacent to the middle portion 32c.

[0040] The remaining terminal blocks 5 and fixing points 7 can be extended from the core coating resin 4 so as to be adjacent to edge portions 32e where the second leg 32 and the outer leg 35 are connected. A portion of the terminal blocks 5 and fixing points 7 arranged adjacent to these edge portions 32e can also be accommodated inside the envelope of the coil 2 and the core 3, further reducing the space required for the reactor 1.

[0041] Next, FIG. 6 is a stress distribution diagram showing stress generated at various points of the terminal block 5. In FIG. 6, stress is represented by shading, with darker areas indicating relatively high stress and lighter areas indicating relatively low stress. (a1) and (a2) of FIG. 6 show the case where torque is applied to the terminal block 5 in the right or clockwise direction to tighten a fastener such as a bolt or screw. (b1) and (b2) of FIG. 6 show the case where torque is applied to the terminal block 5 in the left or counterclockwise direction, which is opposite to the direction in which the fastener is tightened. (a1) and (b1) of FIG. 6 show the stress distribution of the busbar 6, and (a2) and (b2) of FIG. 6 show the stress distribution of the terminal block 5.

[0042] The maximum stress values ​​within the circle drawn in Figure 6 are shown in Table 1 below. The stress distribution was analyzed using a simulator with reactor 1 fixed at all fixing points 7 and a torque of 5.0 N m applied in a temperature environment of 25°C.

[0043] (Table 1) TIFF0007657662000001.tif41161

[0044] In Table 1 above, the numerical values ​​for the row and clockwise column of the busbar 6 are the maximum stress values ​​within the circle of (a1) in Figure 6. The numerical values ​​for the row and counterclockwise column of the busbar 6 are the maximum stress values ​​within the circle of (b1) in Figure 6. The numerical values ​​for the row and clockwise column of the terminal block 5 are the maximum stress values ​​within the circle of (a2) in Figure 6. The numerical values ​​for the row and counterclockwise column of the terminal block 5 are the maximum stress values ​​within the circle of (b2) in Figure 6. As shown in Table 1, the stress generated in the busbar 6 and terminal block 5 is smaller when torque is applied in a clockwise direction than when torque is applied in a counterclockwise direction.

[0045] In this reactor 1, fixed point 7 is located in a specified direction D2 that is rotated 90 degrees clockwise from the reference direction D1 in which the terminal block 5 extends, relative to the terminal block 5. Therefore, when torque is applied to the terminal block 5 in a clockwise direction, stress is generated in the terminal block 5 in a direction compressing it relative to the fixed point 7. On the other hand, when torque is applied to the terminal block 5 in a counterclockwise direction, stress is generated in the terminal block 5 in a tensile direction relative to the fixed point 7. Resin is relatively strong in the compressive direction and relatively weak in the tensile direction. Therefore, as shown in Table 1, when torque is applied to the terminal block 5 in a clockwise direction, the stress generated in the bus bar 6 and the terminal block 5 is smaller.

[0046] Therefore, in this reactor 1, when a terminal of an external device is disposed on the terminal block 5, the reactor 1 is resistant to the torque generated when a fastener such as a bolt or a screw is tightened clockwise on the terminal block 5, and damage to the terminal block 5 is suppressed.

[0047] 4 , the conductive wire 22 and the bus bar 6 drawn out from the coil 2 are drawn out in a specified direction D2 with respect to the terminal block 5. The conductive wire 22 is disposed at a position farther from the terminal block 5 than the bus bar 6, and the bus bar 6 is disposed at a position closer to the terminal block 5 than the conductive wire 22 drawn out from the coil 2.

[0048] For this reason, in this reactor 1, when a terminal of an external device is disposed on terminal block 5 and a fastener such as a bolt or a screw is tightened clockwise to terminal block 5, bus bar 6 is pressed against welding surface 23 of conductive wire 22. Therefore, no force acts in a direction that pulls bus bar 6 away from welding surface 23 of conductive wire 22, and the risk of bus bar 6 and conductive wire 22 coming loose when a fastener such as a bolt or a screw is tightened clockwise to terminal block 5 is reduced.

[0049] FIG. 7 is a side perspective view of the reactor 1 with a case 8. As shown in FIG. 7, the reactor 1 may be provided with a case 8. The case 8 has a general box shape with an open top and a bottom. The core 3 with the coil 2 fitted therein is housed in the case 8. The fixing points 7 are used to fix the core 3 to the case 8. A filler 9 is filled and solidified between the core 3 with the coil 2 fitted therein and the case 8.

[0050] Case 8 is made of a lightweight metal with high thermal conductivity, such as an aluminum alloy, and has heat dissipation properties. For filler 9, a relatively soft resin with high thermal conductivity is suitable in order to ensure the heat dissipation performance of reactor 1 and reduce vibration transmission from reactor 1 to case 8. In addition, filler 9 preferably has insulating properties. Examples of filler 9 include silicone resin, urethane resin, epoxy resin, and acrylic resin.

[0051] This case 8 houses the core 3 with the coil 2 fitted in it, with the first leg 31 in which the coil 2 is fitted being brought close to the bottom surface of the case 8. Because the coil 2 is fitted biased toward the first leg 31, the filler 9 can be filled into the case 8 and solidified until it is flush with the top surface 21 of the coil 2, i.e., the surface opposite to the bottom surface of the case 8, or until the interface of the filler 9 is positioned higher than the top surface 21. Therefore, heat generated in various parts of the coil 2 can be dissipated to the filler 9.

[0052] As described above, the core 3 of the reactor 1 has the first leg 31 and the second leg 32 extending in parallel, and three or more third legs 33 extending between the first leg 31 and the second leg 32. The two coils 2, 2 are attached to the first leg 31, separated by the middle leg 34 of the third legs 33 that is sandwiched between the other third legs 33 on both sides. As a result, there is no coil 2 on the second leg 32 side, and a space is generated on the second leg 32 side. One terminal block 5 is disposed adjacent to the middle part 32c where the second leg 32 and the middle leg 34 are connected, and the fastening hole 51 extends along the middle leg 34.

[0053] Therefore, when projected along the extension direction of the fastening hole 51, this terminal block 5 is positioned so that most of it is contained between the two coils 2, 2 separated by the middle leg portion 34, thereby achieving space saving for the reactor 1.

[0054] In order to achieve space saving of the reactor 1, the fixing point 7 may be arranged adjacent to the middle portion 32c, and the terminal block 5 or the fixing point 7 may be arranged adjacent to the middle portion 32c. The number of coils 2 is not limited to two, but may be three or more, and the number of third legs 33 may be increased according to the number of coils 2. The number of middle portions 32c also increases according to an increase in the number of third legs 33. As long as some of the terminal block 5 and the fixing point 7 can be arranged at each middle portion 32c, the space saving of the reactor 1 is not hindered, and the greater the number of coils 2, the greater the effect of space saving.

[0055] In addition, the other part of the terminal block 5 and the fixed point 7 is arranged adjacent to an edge portion 32e where an outer leg portion 35 of the third leg portion 33, which has no other third leg portion 33 on one side, is connected to the second leg portion 32. This achieves further space saving of the reactor 1.

[0056] The reactor 1 also includes a core coating resin 4 that coats the core 3. The terminal block 5 and the fixing point 7 extend seamlessly from the core coating resin 4. Two or more terminal blocks 5 and one or more fixing points 7 are arranged side by side on a straight line L, and the fixing point 7 located on the straight line L is located in a specified direction D2 with respect to the terminal block 5 located on the straight line L. The specified direction D is a direction of 90 degrees clockwise from a reference direction D1 from an extension base end 52 of the terminal block 5 located on the straight line L to a far end 53 away from the core coating resin 4.

[0057] As a result, when a fastener such as a bolt or a screw is tightened clockwise to the terminal block 5, compressive stress becomes dominant in the terminal block 5, and damage to the terminal block 5 is suppressed due to the resin property of being stronger against compressive stress than tensile stress. Note that there may be multiple fixing points 7 on the straight line L. In this case, it is sufficient that each terminal block 5 has one or more fixing points 7 in the direction of the specified direction D2. In other words, when the straight line L is placed in front and the second leg 32 is placed in the back, the terminal block 5 should not be placed at the leftmost position.

[0058] The reactor 1 also includes a bus bar 6, one end of which is wired to the terminal block 5 and the other end of which is welded to the conductive wire 22 drawn from the coil 2. The conductive wire 22 drawn from the coil 2 and the bus bar 6 are drawn in a specified direction D2' with respect to the terminal block 5 as a reference, the conductive wire 22 drawn from the coil 2 is disposed in a position farther from the terminal block 5 in the specified direction D2' than the bus bar 6, and the bus bar 6 is disposed in a position closer to the terminal block 5 in the specified direction D2' than the conductive wire 22 drawn from the coil 2. When the terminal block 5 extends from the core coating resin 4, the specified direction D2' coincides with the specified direction D2.

[0059] This makes it possible to reduce the risk of bus bar 6 coming off welded surface 23 of conductive wire 22 when fasteners such as bolts and screws are tightened to terminal block 5 in a clockwise direction.

[0060] Furthermore, this reactor 1 is provided with a case 8 that houses the coil 2 and the core 3 so that the first leg 31 is positioned on the bottom side of the case 8, and a filler 9 that is filled and solidified inside the case 8 that houses the coil 2 and the core 3 until at least the entire coil 2 is buried.

[0061] As a result, the coil 2 is biasedly fitted into the first leg 31 of the core 3, so that the entire coil 2 can be embedded in the filler 9, improving the heat dissipation from the coil 2. Incidentally, the reactor 1 is not necessarily housed in the case 8, and the fixing point 7 may be used to fix the reactor 1 to another external frame or the like.

[0062] The above-mentioned embodiment of the present invention is presented as an example, and the present invention is not limited to the above-mentioned embodiment. The above-mentioned embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. The embodiment and its modifications are included in the scope of the present invention. [Explanation of symbols]

[0063] 1 Reactor 2 Coil 21 Top side 22 Conductive Wire 23 Welding Mask 3 Cores 31 First leg 32 Second leg 32c Middle part 32e Edge 33 Third Leg 34 Medial leg 35 Outer leg 36 Core Block 4 Core coating resin 5 Terminal block 51 Fastening holes 52 Extended proximal end 53 Far end 6 Busbar 61 Linear section 62 Tongue piece 7 Fixed points 71 Fastening holes 8 Cases 9. Fillers L straight line D1 Reference Orientation D2 Specified direction

Claims

1. A plurality of coils each having a conductive wire wound thereon; a core on which the plurality of coils are mounted; a terminal block having a fastening hole for electrically connecting a terminal outside the reactor and the coil; a fixing point having a fastening hole for fixing the core to which the coil is attached; Equipped with The core is a first leg and a second leg extending parallel to each other; three or more third legs extending between the first legs and the second legs; having The plurality of coils are attached to the first leg, separated by middle legs of the third leg that are sandwiched between other third legs on both sides, a part of the terminal block and the fixing point is adjacent to a portion where the second leg and the middle leg are connected, and the fastening hole is disposed so as to extend along the middle leg; A reactor characterized by the above.

2. the other part of the terminal block and the fixing point is adjacent to a portion where an outer leg part of the third leg part, which has no other third leg part on one side, is connected to the second leg part, and is disposed so that the fastening hole extends along the outer leg part; The reactor according to claim 1 .

3. A core coating resin is provided to coat the core, The terminal block and the fixing point extend seamlessly from the core coating resin, Two or more of the terminal blocks and one or more fixed points are arranged in a straight line, the fixed point located on the straight line is located in a specified direction with respect to the terminal block located on the straight line, the specified direction is a direction of 90 degrees clockwise from a reference point in a direction from an extension base end of the terminal block located on the straight line to a far end away from the core coating resin; The reactor according to claim 1 or 2,

4. a bus bar having one end connected to the terminal block and the other end welded to the conductive wire drawn from the coil; The conductive wire and the bus bar are drawn out from the coil in a specified direction based on the terminal block, the specified direction is a direction of 90 degrees clockwise from a reference point in a direction from an extension base end of the terminal block to a remote end away from the core, the conductive wire drawn from the coil is disposed at a position farther from the terminal block than the bus bar is, the bus bar is disposed at a position closer to the terminal block than the conductive wire drawn from the coil; The reactor according to claim 1 or 2,

5. a bus bar having one end connected to the terminal block and the other end welded to the conductive wire drawn from the coil; the conductive wire and the bus bar are drawn out from the coil in the specified direction with respect to the terminal block; the conductive wire drawn from the coil is disposed at a position farther from the terminal block than the bus bar is, the bus bar is disposed at a position closer to the terminal block than the conductive wire drawn from the coil; The reactor according to claim 3 .

6. a case that houses the coil and the core such that the first leg is located on the bottom side of the case; A filler that is filled and solidified in the case containing the coil and the core until at least the entire coil is buried; To have The reactor according to any one of claims 1 to 4,

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