Core unit

Abstract

The present invention provides a core unit comprising: a core with a through hole; and a first conductor with conductive properties that has a portion penetrating the through hole. The first conductor includes: a plate-shaped first member that penetrates in a first direction, which is the direction of penetration of the through hole, and has a first protruding region that protrudes to a first side of the direction of penetration; a plate-shaped second member that is disposed beside and spaced apart from the first member in a second direction, which is the width direction of the first member, penetrates in the first direction, and has a second protruding region that protrudes to a second side of the direction of penetration, which is the side opposite from the first side; and a plate-shaped third member that runs along the outer perimeter of the core, has a first connecting region electrically connected to the first protruding region and a second connecting region electrically connected to the second protruding region, and electrically connects the first member with the second member.

Description

Core Unit

[0001] The present disclosure relates to a core unit.

[0002] A technique relating to a common mode choke coil using a composite magnetic core has been disclosed (see, for example, Patent Document 1). The common mode choke coil disclosed in Patent Document 1 employs a structure in which a conducting wire is wound around an annular core.

[0003] Japanese Unexamined Patent Publication No. 62-7101

[0004] A core unit according to the present disclosure includes a core having a through hole, and a first conductor that is electrically conductive and has a portion that passes through the through hole. The first conductor includes: a plate-like first member that passes through in a first direction that is the penetration direction of the through hole and has a first protruding region that protrudes to a first side in the penetration direction, a plate-like second member that is arranged adjacent to the first member in a second direction that is the width direction of the first member and that passes through in the first direction and has a second protruding region that protrudes to a second side in the penetration direction that is opposite to the first side, and a plate-like third member that passes around the outer periphery of the core and has a first connection region electrically connected to the first protruding region and a second connection region electrically connected to the second protruding region, electrically connecting the first member and the second member.

[0005] Fig. 1 is a schematic perspective view showing a configuration of a core unit in embodiment 1 of the present disclosure. Fig. 2 is a schematic plan view of the core unit shown in Fig. 1. Fig. 3 is a schematic side view of the core unit shown in Fig. 1. Fig. 4 is a schematic front view of the core unit shown in Fig. 1. Fig. 5 is a schematic cross-sectional view of the core unit shown in Fig. 1. Fig. 6 is a schematic side view showing a core unit in embodiment 2. Fig. 7 is a schematic front view of the core unit shown in Fig. 6. Fig. 8 is a schematic perspective view showing a core unit in embodiment 3.

[0006] [Problem to be Solved by the Present Disclosure] In the method of manufacturing a noise filter by winding a conductor around an annular core to form a coil, as in the technology disclosed in Patent Document 1, the conductor must be thin, making it difficult to pass a large current through the conductor. A possible method for eliminating noise is to pass a relatively large conductor with a large cross-sectional area through a through hole provided in the annular magnetic core. However, when large currents and high voltages are required, it is expected that noise will increase, so it is necessary to ensure high impedance.

[0007] Therefore, one of the objects is to provide a core unit that can pass a large current while maintaining a high impedance.

[0008] [Effects of the Present Disclosure] According to the core unit, a large current can flow while ensuring high impedance.

[0009] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be described. A core unit according to the present disclosure includes: (1) a core having a through hole; and a first conductor that is conductive and has a portion that passes through the through hole. The first conductor includes: a plate-like first member that passes through the through hole in a first direction, which is the penetration direction of the through hole, and has a first protruding region that protrudes to a first side in the penetration direction; a plate-like second member that is arranged adjacent to the first member at a distance in a second direction, which is the width direction of the first member, and that passes through the through hole in the first direction and has a second protruding region that protrudes to a second side in the penetration direction that is opposite to the first side; and a plate-like third member that passes around the outer periphery of the core, and has a first connection region electrically connected to the first protruding region and a second connection region electrically connected to the second protruding region, electrically connecting the first member and the second member.

[0010] According to the core unit of the present disclosure, the first and second members each have a portion that passes through a through hole provided in the core. Therefore, the first, second, and third members achieve a structure in which the first conductor is wound around the core. However, the first and second members do not need to be flexible and can be flat. Therefore, the structure in which the first conductor is wound around the core ensures high impedance, while the use of plate-shaped members allows for large currents. As a result, the core unit can pass large currents while maintaining high impedance. Furthermore, since the first conductor can be installed in such a core unit from either side of the through hole, excellent workability can be ensured.

[0011] (2) In the above (1), when viewed from a third direction, which is the thickness direction of the first member, the first connection region may overlap the first protruding region, and the second connection region may overlap the second protruding region. This allows the first member and the second member to contact the third member at their plate-like portions, making it easier to efficiently pass a large current.

[0012] (3) In the above (1) or (2), the third member may be connected to at least one of the first member and the second member by fastening with a bolt. This allows a strong connection between at least one of the first member and the second member and the third member. Therefore, a large current can be passed while ensuring a more stable high impedance.

[0013] (4) In any of (1) to (3) above, the third member may be composed of a plurality of divided members spaced apart in the second direction. The core unit may further include a plate-shaped intermediate member that passes through the through hole in the first direction and has protruding regions that protrude to the first and second sides. The third member may electrically connect the first member and the second member via the plurality of divided members and intermediate members. This allows the first conductor to be wound around the core multiple times using the first member, second member, third member, and intermediate member. Therefore, even higher impedance can be ensured.

[0014] (5) In any of the above (1) to (4), the core unit may further include an insulating core case that houses the core. The third member may pass through the outer periphery of the core case. This reduces the risk of contact between the core and the first conductor, while protecting the core with the core case and preventing damage to the core. Therefore, the core unit can be used stably for a longer period of time.

[0015] (6) In the above (5), the core case may be annular and may include an inner wall portion defining a space for accommodating the core. A groove extending in a first direction may be provided on the inner wall surface of the inner wall portion. At least one of the first member and the second member may have a portion that fits into the groove. By doing so, at least one of the first member and the second member can be fitted into the groove provided on the inner wall surface of the inner wall portion of the core case, improving assembly efficiency and allowing the member fitted into the groove to be stably held in the core case.

[0016] (7) In any of (1) to (6) above, the core unit may further include a second conductor that is conductive and has a portion that penetrates the through hole. The second conductor may include: a plate-shaped fourth member that penetrates the through hole in the first direction and has a third protruding region that protrudes toward the first side; a plate-shaped fifth member that is arranged in parallel with and spaced apart from the fourth member in the second direction, penetrates the through hole in the first direction, and has a fourth protruding region that protrudes toward the first side; and a plate-shaped sixth member that passes along the outer periphery of the core, has a third connection region electrically connected to the third protruding region, and a fourth connection region electrically connected to the fourth protruding region, and electrically connects the fourth member and the fifth member. This allows high impedance to be ensured while allowing large currents to flow in opposite directions through the first conductor and the second conductor. In this case, the first member and the fourth member, and the second member and the fifth member, can be arranged to form parallel plates, and magnetic fluxes can be canceled out when currents flow in opposite directions between the conductors.

[0017] (8) In the above (7), an insulating spacer may be further provided, which penetrates the through hole and is disposed between the first conductor and the second conductor. This significantly reduces the risk of contact between the first conductor and the second conductor. Furthermore, positioning using the spacer is facilitated, stabilizing the postures of the first conductor and the second conductor, ensuring more stable use of the core unit.

[0018] (9) In the above (7), at least one of the first conductor and the second conductor may be fixed to the spacer. This allows the components fixed to the spacer to be integrated, improving assembly efficiency. Also, it is possible to significantly reduce the risk of the components fixed to the spacer falling off from the core unit.

[0019] (10) In any of (7) to (9) above, the orientation of the first and fourth protruding regions in the second direction may be opposite to the orientation of the second and third protruding regions. This allows, for example, bolts to be tightened from the third direction, thereby avoiding interference between tools when attaching the components. This improves productivity.

[0020] [Details of the embodiment of the present disclosure] Next, an embodiment of the core unit of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated.

[0021] (Embodiment 1) The configuration of a core unit according to embodiment 1 of the present disclosure will be described. FIG. 1 is a schematic perspective view illustrating the configuration of a core unit according to embodiment 1 of the present disclosure. FIG. 2 is a schematic plan view of the core unit shown in FIG. 1. FIG. 2 is a view from the direction indicated by arrow II in FIG. 1. FIG. 3 is a schematic side view of the core unit shown in FIG. 1. FIG. 3 is a view from the direction indicated by arrow III in FIG. 1. FIG. 4 is a schematic front view of the core unit shown in FIG. 1. FIG. 4 is a view from the direction indicated by arrow IV in FIG. 1. FIG. 5 is a schematic cross-sectional view of the core unit shown in FIG. 1. FIG. 5 is a cross-sectional view taken along line V-V in FIGS. 1 and 2. In the drawings shown in FIG. 1 and subsequent drawings, the Y direction indicates a first direction, which is the penetration direction of a core, as described below; the Z direction indicates a second direction, which is the width direction of a first conductor, as described below; and the X direction indicates a third direction, which is the thickness direction of the first conductor. Note that, for ease of understanding, spacers, as described below, may be indicated by dashed lines in FIG. 1 and other figures.

[0022] 1 to 5, the core unit 10a according to the first embodiment includes a first conductor 11a, a second conductor 12a, a core 13a, a core case 14a, and a spacer 15a. The core unit 10a is used, for example, as a common-mode noise filter. The first conductor 11a is used, for example, as an N-side bus bar (a negative (-) side bus bar for DC current), and the second conductor 12a is used, for example, as a P-side bus bar (a positive (+) side bus bar for DC current).

[0023] The core 13a has a through hole 16a (see FIG. 5 in particular). That is, the core 13a is made of an annular member. In this embodiment, the core 13a is a magnetic core, and specifically, for example, is manufactured by sintering multiple nanocrystalline foils that are wound around the circumferential direction and laminated. The core 13a may also be made of other materials, such as ferrite or amorphous material.

[0024] The core case 14a accommodates the core 13a. The core case 14a is insulating and made of, for example, resin. The core case 14a is annular. The outer shape of the core case 14a is a rectangular parallelepiped and is provided with a through hole 19a that penetrates in a first direction. When viewed from the Y direction, the through hole 19a of the core case 14a is smaller than the through hole 16a of the core 13a. This allows the core case 14a to accommodate the core 13a. The core case 14a includes an inner wall portion 35a and an outer wall portion 36a that define a space that accommodates the core 13a. The core case 14a further includes a pair of side walls disposed at both ends of the inner wall portion 35a and the outer wall portion 36a in the Y direction. The internal space of the core case 14a is sealed, and the core 13a is disposed in that space. Grooves 17a and 18a are provided on an inner wall surface 37a of the inner wall portion 35a. The grooves 17a and 18a are each recessed in the X direction toward the outer wall portion 36a. The grooves 17a and 18a are each provided to extend along the first direction. The grooves 17a and 18a are provided to face each other in the X direction.

[0025] Next, the configuration of the first conductor 11a will be described. The first conductor 11a is conductive. The first conductor 11a has a portion that passes through the through-hole 16a. The first conductor 11a includes a first member 21a, a second member 22a, and a third member 23a. The first member 21a, the second member 22a, and the third member 23a are each made of a strip-shaped metal plate. The first member 21a and the second member 22a are each plate-shaped, specifically, flat-plate-shaped. The third member 23a is plate-shaped and is formed, for example, by bending a flat metal plate.

[0026] The first member 21a is disposed to extend along a first direction. The first member 21a passes through the through-hole 16a of the core 13a in the first direction, i.e., the Y direction. The arrow Y points from the second side to the first side. The first member 21a is fitted into the groove 17a. The first member 21a has a first connection hole 31a on the first side and a first fastening hole 41a on the second side. The first connection hole 31a and the first fastening hole 41a pass through the first member 21a in the thickness direction. The first connection hole 31a is used, for example, when connecting another member that conducts current to the first member 21a. The first member 21a has a first protruding region 51a that protrudes toward the second side.

[0027] The second member 22a is arranged next to the first member 21a in the second direction, i.e., the Z direction, with a gap therebetween. In this embodiment, the first member 21a is arranged on the upper side in the second direction, and the second member 22a is arranged on the lower side. Like the first member 21a, the second member 22a is arranged to extend along the first direction. The second member 22a also penetrates the through-hole 16a of the core 13a in the first direction. The second member 22a is fitted into the groove 18a. The second member 22a has a second connection hole 32a on the second side and a second fastening hole 42a on the first side. The second connection hole 32a and the second fastening hole 42a penetrate the second member 22a in the thickness direction. The second connection hole 32a is used, for example, to connect another component that conducts current to the second member 22a. The second member 22a has a second protruding region 52a that protrudes toward the first side.

[0028] The third member 23a passes along the outer periphery of the core 13a. In this embodiment, the third member 23a passes along the outer periphery of the core case 14a. The third member 23a includes a first connection region 61a electrically connected to the first protruding region 51a and a second connection region 62a electrically connected to the second protruding region 52a. The first connection region 61a is a region that protrudes toward the first side. The second connection region 62a is a region that protrudes toward the second side. The first connection region 61a overlaps with the first protruding region 51a when viewed from the X direction, which is the third direction. The second connection region 62a also overlaps with the second protruding region 52a when viewed from the X direction. The first connection region 61a and the second connection region 62a are connected by a first inclined region 71a that is inclined with respect to the Y direction and the Z direction, respectively. The first connection region 61a and the second connection region 62a each have a through hole that penetrates in the thickness direction.

[0029] In this embodiment, the third member 23a contacts the first protruding region 51a of the first member 21a in the first connection region 61a. The third member 23a is fastened to the first member 21a by a bolt 81a. The first fastening hole 41a and the through hole provided in the first connection region 61a are used for fastening with the bolt 81a. The third member 23a contacts the second protruding region 52a of the second member 22a in the second connection region 62a. The third member 23a is fastened to the second member 22a by a bolt 82a. The second fastening hole 42a and the through hole provided in the second connection region 62a are used for fastening with the bolt 82a. With this configuration, in the first conductor 11a, the first member 21a and the second member 22a are electrically connected via the third member 23a. Then, a current can be passed from the first member 21a through the third member 23a to the second member 22a.

[0030] Next, the configuration of the second conductor 12a will be described. Like the first conductor 11a, the second conductor 12a is conductive. The second conductor 12a has a portion that passes through the through-hole 16a. The second conductor 12a is disposed spaced apart from the first conductor 11a in the X direction. The second conductor 12a includes a fourth member 24a, a fifth member 25a, and a sixth member 26a. Like the first member 21a, the second member 22a, and the third member 23a, the fourth member 24a, the fifth member 25a, and the sixth member 26a are each composed of a strip-shaped metal plate. The fourth member 24a and the fifth member 25a are each plate-shaped, specifically, flat-plate-shaped. The sixth member 26a is plate-shaped and is formed, for example, by bending a flat metal plate.

[0031] The fourth member 24a is disposed to extend along the first direction. The fourth member 24a penetrates the through-hole 16a of the core 13a in the first direction. The fourth member 24a is fitted into the groove 18a. The fourth member 24a has a third connection hole 33a provided on the second side and a third fastening hole provided on the first side. The third connection hole 33a and the third fastening hole penetrate the fourth member 24a in the thickness direction. The third connection hole 33a is used, for example, when connecting another member that passes current to the fourth member 24a. The fourth member 24a has a third protruding region 53a protruding toward the first side.

[0032] The fifth member 25a is arranged next to the fourth member 24a at a distance in the second direction. In this embodiment, the fourth member 24a is arranged on the upper side in the second direction, and the fifth member 25a is arranged on the lower side. Like the fourth member 24a, the fifth member 25a is arranged to extend along the first direction. The fifth member 25a also passes through the through hole 16a of the core 13a in the first direction. The fifth member 25a is fitted into the groove 18a. The fifth member 25a has a fourth connection hole 34a on the first side and a fourth fastening hole on the second side. The fourth connection hole 34a and the fourth fastening hole pass through the fifth member 25a in the thickness direction. The fourth connection hole 34a is used, for example, to connect another component that conducts current to the fifth member 25a. The fifth member 25a has a fourth protruding region 54a that protrudes toward the second side.

[0033] The sixth member 26a passes along the outer periphery of the core 13a. In this embodiment, the sixth member 26a passes along the outer periphery of the core case 14a. In addition, in this embodiment, the sixth member 26a is disposed on the opposite side of the third member 23a in the third direction, with the core case 14a sandwiched therebetween. The sixth member 26a includes a third connection region 63a electrically connected to the third protruding region 53a and a fourth connection region 64a electrically connected to the fourth protruding region 54a. The third connection region 63a is a region that protrudes toward the second side. The fourth connection region 64a is a region that protrudes toward the first side. The third connection region 63a overlaps with the third protruding region 53a when viewed from the third direction. Furthermore, the fourth connection region 64a overlaps with the fourth protruding region 54a when viewed from the X direction. The third connection region 63a and the fourth connection region 64a are connected by a second inclined region 72a that is inclined with respect to the Y direction and the Z direction, respectively. Each of the third connection region 63a and the fourth connection region 64a is provided with a through-hole that penetrates in the thickness direction.

[0034] In this embodiment, the sixth member 26a contacts the third protruding region 53a of the fourth member 24a at the third connection region 63a. The sixth member 26a is fastened to the fourth member 24a by a bolt 83a. The third fastening hole and a through hole provided in the third connection region 63a are used for fastening with the bolt 83a. The sixth member 26a contacts the fourth protruding region 54a of the fifth member 25a at the fourth connection region 64a. The sixth member 26a is fastened to the fifth member 25a by a bolt 84a. The fourth fastening hole and a through hole provided in the fourth connection region 64a are used for fastening with the bolt 84a. With this configuration, in the second conductor 12a, the fourth member 24a and the fifth member 25a are electrically connected via the sixth member 26a. Thus, current can flow from the fourth member 24a through the sixth member 26a to the fifth member 25a.

[0035] Here, with regard to the arrangement of the first conductor 11a and the second conductor 12a, the direction in which the first protrusion region 51a and the fourth protrusion region 54a are arranged in the second direction (Z direction) (opposite to the direction indicated by arrow Z) is opposite to the direction in which the second protrusion region 52a and the third protrusion region 53a are arranged (direction indicated by arrow Z) (see particularly Figure 3).

[0036] The spacer 15a has insulating properties. The spacer 15a is made of, for example, resin. The spacer 15a has a flat plate shape with its thickness direction corresponding to the third direction. The spacer 15a is arranged to pass through the through hole 16a of the core 13a and the through hole of the core case 14a. The spacer 15a is arranged between the first conductor 11a and the second conductor 12a in the third direction. Nuts 85a, 86a, 87a, and 88a are embedded in the spacer 15a. That is, the nuts 85a, 86a, 87a, and 88a are inserted into the spacer 15a. When viewed from the third direction, the nuts 85a, 86a, 87a, and 88a are provided at positions corresponding to the first fastening hole 41a, the second fastening hole 42a, the third fastening hole, and the fourth fastening hole, respectively. The nuts 85a, 86a, 87a, and 88a are insulated from one another by spacers 15a.

[0037] Next, the current flow in the core unit 10a will be described. First, for example, in the first conductor 11a used as an N-side bus bar, current flowing from the first side where the first connection hole 31a of the first member 21a is provided flows through the first member 21a in a first direction, from the first protruding region 51a to the first connection region 61a of the third member 23a. Then, the current flows from the first connection region 61a through the first inclined region 71a, through the interior of the third member 23a, and to the second connection region 62a. Then, the current flows from the second connection region 62a to the second protruding region 52a of the second member 22a, and then flows through the interior of the second member 22a. Finally, the current reaches the second side of the second member 22a where the second connection hole 32a is located. For example, in the case of the second conductor 12a used as a P-side bus bar, current flowing from the second side where the third connection hole 33a of the fourth member 24a is provided flows through the fourth member 24a in the first direction, from the third protruding region 53a to the third connection region 63a of the sixth member 26a, through the third connection region 63a via the second inclined region 72a, inside the sixth member 26a, and to the fourth connection region 64a, from the fourth connection region 64a to the fourth protruding region 54a of the fifth member 25a, and then flows inside the fifth member 25a, and finally to the first side of the fifth member 25a where the fourth connection hole 34a is located.

[0038] In the core unit 10a, the first member 21a and the second member 22a each have a portion that penetrates the through-hole 16a provided in the core 13a. Therefore, the first, second, and third members achieve a structure in which the first conductor is wound around the core. However, the first and second members do not need to be flexible and can be flat. Therefore, the structure in which the first conductor is wound around the core ensures high impedance, while the use of plate-shaped members allows for high current handling. As a result, the core unit 10a can pass large currents while maintaining high impedance. Furthermore, the core unit 10a allows the first conductor 11a and then the second conductor 12a to be assembled from either side of the through-hole 16a, ensuring good workability.

[0039] In this embodiment, when viewed from the third direction, which is the thickness direction of the first member 21a, the first connection region 61a overlaps with the first protruding region 51a, and the second connection region 62a overlaps with the second protruding region 52a. This allows the first member 21a and the second member 22a to contact the third member 23a at their plate-like portions, making it easy to efficiently pass a large current. The same applies to the second conductor 12a.

[0040] In this embodiment, the third member 23a is connected to both the first member 21a and the second member 22a by fastening with bolts 81a and 82a. This allows for a strong connection between the first member 21a and the second member 22a and the third member 23a. The same applies to the second conductor 12a. This allows for a large current to flow while ensuring a more stable high impedance.

[0041] In this embodiment, the core unit 10a includes an insulating core case 14a that houses the core 13a. The third member 23a passes around the outer periphery of the core case 14a. This reduces the risk of contact between the core 13a and the first conductor 11a and the second conductor 12a, while protecting the core 13a with the core case 14a and preventing damage to the core 13a. This allows the core unit 10a to be used stably for a longer period of time.

[0042] In this embodiment, the core case 14a is annular and includes an inner wall portion 35a that defines a space for accommodating the core 13a. An inner wall surface 37a of the inner wall portion 35a is provided with a groove 17a extending in a first direction. The first member 21a and the second member 22a have portions that fit into the groove 17a. Therefore, the first member 21a and the second member 22a can be fitted into the groove 17a provided in the inner wall surface 37a of the inner wall portion 35a of the core case 14a, improving assembly efficiency and allowing the members fitted into the groove 17a to be stably held in the core case 14a. The same is true for the second conductor 12a, where the fourth member 24a and the fifth member 25a have portions that fit into the groove 18a.

[0043] In this embodiment, the core unit 10a includes a second conductor 12a that is conductive and has a portion that penetrates the through hole 16a. The second conductor 12a includes a plate-like fourth member 24a that penetrates the through hole 16a in the first direction and has a third protruding region 53a that protrudes toward the first side, a plate-like fifth member 25a that is spaced apart from the fourth member 24a in the second direction and that penetrates the through hole 16a in the first direction and has a fourth protruding region 54a that protrudes toward the first side, and a plate-like sixth member 26a that passes along the outer periphery of the core 13a and has a third connection region 63a electrically connected to the third protruding region 53a and a fourth connection region 64a electrically connected to the fourth protruding region 54a, thereby electrically connecting the fourth member 24a and the fifth member 25a. Thus, a high impedance can be ensured while a large current flows in the opposite directions between the first conductor 11a and the second conductor 12a. In this case, the first member 21a and the fourth member 24a, and the second member 22a and the fifth member 25a can be arranged to form parallel plates, and when currents are passed in opposite directions between the conductors, the magnetic fluxes can be canceled out.

[0044] In this embodiment, the core unit 10a includes an insulating spacer 15a that passes through the through hole 16a and is disposed between the first conductor 11a and the second conductor 12a. This significantly reduces the risk of contact between the first conductor 11a and the second conductor 12a. Furthermore, the use of the spacer 15a facilitates positioning, stabilizing the postures of the first conductor 11a and the second conductor 12a, ensuring more stable use of the core unit 10a.

[0045] In this embodiment, the first conductor 11 a and the second conductor 12 a are each fixed to the spacer 15 a. This allows the components fixed to the spacer 15 a to be integrated, improving assembly efficiency. Furthermore, it is possible to significantly reduce the risk of the components fixed to the spacer 15 a falling off from the core unit 10 a.

[0046] In this embodiment, the orientation of the first protruding region 51 a and the fourth protruding region 54 a in the second direction is opposite to the orientation of the second protruding region 52 a and the third protruding region 53 a. Therefore, for example, the bolts 81 a, 82 a, 83 a, and 84 a can be tightened from the third direction, which prevents interference between tools when attaching each component. This improves productivity.

[0047] (Embodiment 2) Another embodiment, embodiment 2, will now be described. Fig. 6 is a schematic side view showing a core unit in embodiment 2. Fig. 7 is a schematic front view of the core unit shown in Fig. 6. Core unit 10b in embodiment 2 basically has the same configuration as embodiment 1, and achieves the same effects. However, the core unit in embodiment 2 differs from embodiment 1 in the number of folds in the first direction.

[0048] 6 and 7 , core unit 10b according to the second embodiment includes first conductor 11a, second conductor 12a, core 13a, core case 14a, and spacer 15a. First conductor 11a includes first member 21a, second member 22a, and third member 23b. Third member 23b is composed of a plurality of divided members spaced apart in the second direction. In this embodiment, third member 23b includes first divided member 91b, second divided member 92b, and third divided member 93b. That is, third member 23b is divided into three divided members. First divided member 91b, second divided member 92b, and third divided member 93b each have the same configuration as third member 23a according to the first embodiment.

[0049] The core unit 10b includes a plate-shaped intermediate member 27b that passes through the through-hole 16a in the first direction and has protruding regions that protrude to the first and second sides. In this embodiment, the intermediate member 27b is composed of a first intermediate member 94b and a second intermediate member 95b. That is, two intermediate members 27b are provided. The core unit 10b includes a plurality of bolts 81b, 82b, 83b, 84b, 85b, and 86b. Fastening the bolt 81b on the second side electrically connects the first member 21a and the first divided member 91b. Fastening the bolt 82b on the first side electrically connects the first divided member 91b and the first intermediate member 94b. Fastening the bolt 83b on the second side electrically connects the first intermediate member 94b and the second divided member 92b. Fastening bolts 84b on the first side electrically connects second divided member 92b and second intermediate member 95b. Fastening bolts 85b on the second side electrically connects second intermediate member 95b and third divided member 93b. Fastening bolts 86b on the first side electrically connects third divided member 93b and second member 22a. First member 21a and second member 22a are electrically connected via third member 23b, which is made up of first divided member 91b, second divided member 92b, and third divided member 93b, and intermediate member 27b, which is made up of first intermediate member 94b and second intermediate member 95b.

[0050] By doing so, it is possible to achieve a structure in which the first conductor 11a is wound around the core 13a multiple times using the first member 21a, the second member 22a, the third member 23b, and the intermediate member 27b, thereby ensuring even higher impedance.

[0051] (Embodiment 3) Another embodiment, embodiment 3, will now be described. Fig. 8 is a schematic perspective view showing a core unit in embodiment 3. The core unit 10c in embodiment 3 basically has the same configuration as in embodiment 1, and achieves the same effects. However, the core unit in embodiment 3 differs from embodiment 1 in that it does not include a second conductor.

[0052] 8, the core unit 10c of the third embodiment includes the core unit 10a of the first embodiment, which includes the first conductor 11a, the core 13a, the core case 14a, and the spacer 15a. Unlike the first embodiment, as described above, the core unit 10c does not include the second conductor 12a. Furthermore, the core unit 10c does not include components or parts, such as the bolt 83a and the nut 87a, that are required to include the second conductor 12a. Even with this configuration, a large current can be passed while maintaining a high impedance.

[0053] Other Embodiments In the above-described embodiments, at least one of the first member and the second member may have a portion that is fitted into a groove. By doing so, the groove can be utilized to improve assembly, and the member that is fitted into the groove can be stably held in the core case.

[0054] In the above embodiment, the third member may be connected to at least one of the first member and the second member by fastening with a bolt. This allows a strong connection between at least one of the first member and the second member and the third member. Therefore, a large current can be passed through the third member while ensuring a more stable high impedance.

[0055] In the above embodiment, at least one of the first conductor and the second conductor may be fixed to the spacer. This allows the components fixed to the spacer to be integrated, improving assembly efficiency. Furthermore, it is possible to significantly reduce the risk of the components fixed to the spacer falling off the core unit.

[0056] It should be understood that the embodiments disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present disclosure is defined not by the above description but by the scope of the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0057] 10a, 10b, 10c Core unit 11a First conductor 12a Second conductor 13a Core 14a Core case 15a Spacer 16a, 19a Through hole 17a, 18a Groove 21a First member 22a Second member 23a Third member 24a Fourth member 25a Fifth member 26a Sixth member 31a First connection hole 32a Second connection hole 33a Third connection hole 34a Fourth connection hole 35a Inner wall portion 36a Outer wall portion 37a Inner wall surface 41a First fastening hole 42a Second fastening hole 51a First protruding region 52a Second protruding region 53a Third protruding region 54a Fourth protruding region 61a First connection region 62a Second connection region 63a Third connection region 64a Fourth connection region 71a First inclined region 72a Second inclined region 81a, 81b, 82a, 82b, 83a, 83b, 84a, 84b, 85b Bolts 85a, 86a, 86b, 87a, 88a Nuts 91b First divided member 92b Second divided member 93b Third divided member 94b First intermediate member 95b Second intermediate member.

Claims

1. A core unit comprising: a core having a through hole; and a first conductor that is conductive and has a portion that passes through the through hole, wherein the first conductor includes: a plate-like first member that passes through the through hole in a first direction that is a penetration direction of the through hole and has a first protruding region that protrudes to a first side in the penetration direction; a plate-like second member that is arranged side by side and spaced from the first member in a second direction that is a width direction of the first member, and that passes through the through hole in the first direction and has a second protruding region that protrudes to a second side in the penetration direction that is the opposite side to the first side; and a plate-like third member that passes around the outer periphery of the core, has a first connection region electrically connected to the first protruding region and a second connection region electrically connected to the second protruding region, and electrically connects the first member and the second member.

2. A core unit as described in claim 1, wherein, when viewed from a third direction which is the thickness direction of the first member, the first connection region overlaps with the first protruding region, and the second connection region overlaps with the second protruding region.

3. A core unit as described in claim 1 or claim 2, wherein the third member is connected to at least one of the first member and the second member by fastening with a bolt.

4. A core unit as described in any one of claims 1 to 3, wherein the third member is composed of a plurality of divided members each arranged at intervals in the second direction, the core unit further includes a plate-shaped intermediate member that passes through the through hole in the first direction and has a protruding region that protrudes to the first side and the second side, and the third member electrically connects the first member and the second member via the plurality of divided members and the intermediate member.

5. A core unit as claimed in any one of claims 1 to 4, further comprising a core case that houses the core and has insulating properties, wherein the third member passes through the outer periphery of the core case.

6. A core unit as described in claim 5, wherein the core case is annular and includes an inner wall portion defining a space for accommodating the core, an inner wall surface of the inner wall portion is provided with a groove extending in the first direction, and at least one of the first member and the second member has a portion that is fitted into the groove.

7. A core unit as described in any one of claims 1 to 6, further comprising a second conductor that is conductive and has a portion that passes through the through hole, the second conductor including: a plate-shaped fourth member that passes through the through hole in the first direction and has a third protruding region that protrudes to the first side; a plate-shaped fifth member that is arranged in parallel with and spaced from the fourth member in the second direction, passes through the through hole in the first direction and has a fourth protruding region that protrudes to the first side; and a plate-shaped sixth member that passes around the outer periphery of the core, has a third connection region electrically connected to the third protruding region and a fourth connection region electrically connected to the fourth protruding region, and electrically connects the fourth member and the fifth member.

8. The core unit according to claim 7, further comprising an insulating spacer that passes through the through hole and is disposed between the first conductor and the second conductor.

9. The core unit according to claim 8, wherein at least one of the first conductor and the second conductor is fixed to the spacer.

10. A core unit described in any one of claims 7 to 9, wherein the orientation in which the first protrusion region and the fourth protrusion region are arranged in the second direction is opposite to the orientation in which the second protrusion region and the third protrusion region are arranged.

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