Coil parts

Abstract

This coil component comprises a core having a through-hole, and a coil part that passes through the through-hole and is wound onto the core. The coil part includes a first conductor part and a second conductor part. The first conductor part includes a first section that penetrates from a first side to a second side in a first direction that is the penetration direction of the through-hole, a second section that extends to the outer peripheral side from the inner peripheral side of the core, and a third section that extends toward the first side passing along the outer peripheral side of the core. The second conductor part includes a fourth section that penetrates from the second side to the first side in the first direction, a fifth section that extends to the outer peripheral side from the inner peripheral side of the core, and a sixth section that extends toward the second side passing along the outer peripheral side of the core. The third section and the sixth section each have an overlapping section that overlaps with the other in the first direction, and are connected in the overlapping sections.

Description

[Technical Field]

[0001] The present disclosure relates to a coil component. [Background technology]

[0002] A coil component is known that includes a core (magnetic core) made of a magnetic material and a coil portion made of a conductor and wound around the core. For example, a coil component in which a pair of coil portions are wound around an annular core can be used as a common mode noise filter (see, for example, Japanese Patent Laid-Open Publication No. 62-7101 (Patent Document 1)). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 62-7101 Summary of the Invention

[0004] A coil component according to the present disclosure includes a core having a through hole and a coil portion wound around the core through the through hole. The coil portion includes a first conductor portion and a second conductor portion connected to the first conductor portion. The first conductor portion includes a first portion penetrating from a first side to a second side along a first direction, which is the penetrating direction of the through hole; a second portion connected to the first portion on the second side and extending from the inner periphery to the outer periphery of the core; and a third portion connected to the second portion on the side opposite to the side connected to the first portion and extending through the outer periphery of the core toward the first side. The second conductor portion includes a fourth portion penetrating from the second side to the first side along the first direction, a fifth portion connected to the fourth portion on the first side and extending from the inner periphery to the outer periphery of the core; and a sixth portion connected to the fifth portion on the side opposite to the side connected to the fourth portion and extending through the outer periphery of the core toward the second side. The third portion and the sixth portion have an overlapping portion where they overlap each other along the first direction, and are connected to each other at the overlapping portion. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a schematic perspective view showing the structure of a coil component according to a first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a schematic perspective view showing the structure of the coil component according to the second embodiment. [Figure 5] FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a schematic perspective view showing the structure of the coil component according to the third embodiment. [Figure 8] FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 10 is a schematic perspective view showing the structure of the coil component according to the fourth embodiment. [Figure 11] FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG. [Figure 12] FIG. 12 is a schematic perspective view showing the structure of the coil component according to the fifth embodiment. [Figure 13] FIG. 13 is a schematic cross-sectional view taken along line XIII-XIII in FIG. [Figure 14] FIG. 14 is a schematic cross-sectional view taken along line XIV-XIV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0006] [Problem to be solved by this disclosure] In a structure in which a conductor is wound around an annular core, as disclosed in Patent Document 1, a thin conductor must be used to ensure the flexibility of the conductor. This poses a problem of difficulty in handling large currents. In contrast, a structure in which a thick conductor passes through a through hole in an annular core without winding the conductor around the core can handle large currents. However, this structure has the problem of reducing impedance, which is proportional to the square of the number of turns. In other words, conventional coil components have difficulty in handling large currents and achieving high impedance at the same time. One of the objectives of the present disclosure is to provide a coil component that can handle large currents and achieve high impedance at the same time.

[0007] [Effects of this disclosure] The coil component of the present disclosure can accommodate large currents and have high impedance at the same time.

[0008] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be described. A coil component of the present disclosure includes a core having a through hole and a coil portion wound around the core through the through hole. The coil portion includes a first conductor portion and a second conductor portion connected to the first conductor portion. The first conductor portion includes a first portion penetrating from a first side to a second side along a first direction, which is the penetrating direction of the through hole; a second portion connected to the first portion on the second side and extending from the inner periphery of the core to the outer periphery; and a third portion connected to the second portion on the opposite side to the side connected to the first portion and extending through the outer periphery of the core toward the first side. The second conductor portion includes a fourth portion penetrating from the second side to the first side along the first direction; a fifth portion connected to the fourth portion on the first side and extending from the inner periphery of the core to the outer periphery; and a sixth portion connected to the fifth portion on the opposite side to the side connected to the fourth portion and extending through the outer periphery of the core toward the second side. The third portion and the sixth portion have an overlapping portion where they overlap each other along the first direction, and are connected to each other at the overlapping portion.

[0009] The coil component of the present disclosure employs a structure in which the first conductor portion and the second conductor portion, each including a portion that penetrates the through hole of the core, a portion that extends from the inner periphery of the core to the outer periphery, and a portion that extends through the outer periphery of the core, are connected at the overlapping portion of the third portion and the sixth portion. This achieves a structure in which the coil portion is wound around the core, while the first conductor portion and the second conductor portion do not need to be flexible, allowing thick conductor portions to be used as the first conductor portion and the second conductor portion. As a result, the structure in which the coil portion is wound around the core ensures high impedance, while the thick conductor portions enable support for large currents. In this way, the coil component of the present disclosure can achieve both support for large currents and high impedance.

[0010] In the coil component, the first, second, third, fourth, fifth, and sixth portions may each be made of a strip-shaped conductor, which increases the cross-sectional area to facilitate handling of a large current and simplifies manufacturing.

[0011] In the coil component, the strip-shaped conductor may have a uniform thickness, which reduces the number of materials required to fabricate the first conductor portion and the second conductor portion.

[0012] In the coil component, the first and fourth portions may be spaced apart from each other and at least partially overlap each other in the thickness direction, which makes it easy to reduce the size of the core in the width direction of the first and fourth portions.

[0013] The coil component may include a pair of coil portions including a first coil portion and a second coil portion. By including a pair of coil portions, a coil component usable as, for example, a common mode noise filter can be obtained.

[0014] The coil component may include a pair of coil portions including a first coil portion and a second coil portion. The first and fourth portions of the first coil portion and the first and fourth portions of the second coil portion may be arranged so as to at least partially overlap with a gap between them in the thickness direction. By including a pair of coil portions, a coil component usable as a common-mode noise filter can be obtained. Furthermore, by arranging the first and fourth portions of the first coil portion and the first and fourth portions of the second coil portion so as to overlap with a gap between them in the thickness direction, it becomes easy to reduce the size of the core in the width direction of the first and fourth portions.

[0015] The coil component may include a pair of coil portions including a first coil portion and a second coil portion. The first and fourth portions of the first coil portion and the first and fourth portions of the second coil portion may be arranged side by side with a gap between them in the width direction. By including a pair of coil portions, a coil component usable as a common mode noise filter can be obtained. Furthermore, by arranging the first and fourth portions of the first coil portion and the first and fourth portions of the second coil portion side by side with a gap between them in the width direction, it becomes easy to reduce the size of the core in the thickness direction of the first and fourth portions.

[0016] In the coil component, the first, second, and third portions may be formed from a single conductor. The fourth, fifth, and sixth portions may be formed from a single conductor. This configuration facilitates the manufacture of the coil component of the present disclosure.

[0017] In the coil component, the core may include a main body made of a magnetic material and a resin case covering the main body, whereby the main body of the core can be appropriately protected.

[0018] [Details of the embodiment of the present invention] Next, embodiments of the coil component according to the present disclosure will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0019] (Embodiment 1) FIG. 1 is a schematic perspective view showing the structure of a coil component according to the first embodiment. In FIG. 1, in order to facilitate understanding of the structure of core 30, case 31 of core 30 is represented by a dashed line, and internal main body 32 is represented by a solid line. In FIG. 1, the penetrating direction of through hole 30A of core 30 (first direction α) is defined as the X-axis direction. Also, in FIG. 1, a Y-axis direction that is perpendicular to the X-axis direction, and a Z-axis direction that is perpendicular to the X-axis and Y-axis directions are defined. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1. FIG. 2 is a cross-sectional view in the YZ plane. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 1. FIG. 3 is a cross-sectional view in the XZ plane.

[0020] 1 to 3, a common-mode noise filter 1 as a coil component according to the first embodiment includes a core 30 and a pair of coil portions, a first coil portion 10 and a second coil portion 20. The core 30 has an annular shape. The core 30 has a through-hole 30A penetrating the core 30 in a first direction α (the X-axis direction). The core 30 includes a main body portion 32 and a case 31. The main body portion 32 has an annular shape. The main body portion 32 is made of a magnetic material. Examples of magnetic materials that can be used for the main body portion 32 include ferrite, amorphous magnetic materials, nanocrystalline magnetic materials, Permalloy, and Sendust (registered trademark; an alloy primarily composed of iron and containing silicon and aluminum). Referring to FIG. 2, the outer circumferential surface of the main body portion 32 has a square shape with four arc-shaped corners in a cross section (YZ plane) perpendicular to the first direction α. Furthermore, the wall surface (inner peripheral surface) of the main body 32 surrounding the through hole 30A has a square shape with four arc-shaped corners. With reference to FIGS. 1 and 3, the case 31 covers the entire main body 32, including the outer peripheral surface, inner peripheral surface, and both end surfaces of the main body 32. The case 31 may be composed of two parts that can be separated in the X-axis direction. The case 31 is made of resin.

[0021] The first coil portion 10 includes a first conductor portion 14 and a second conductor portion 19. The second conductor portion 19 is physically and electrically connected to the first conductor portion 14. The first conductor portion 14 includes a first portion 11, a second portion 12, and a third portion 13. The first portion 11 penetrates the core 30 along the first direction α from a first side, which is one side of the core 30, to a second side, which is the other side. The first portion 11 has a flat plate shape extending linearly along the first direction α. ​​The second portion 12 is connected to the first portion 11 on the second side of the core 30. The second portion 12 extends from the inner periphery side to the outer periphery side of the core 30. The second portion 12 includes a first region 121, a second region 122, and a third region 123. The first region 121 is connected to the first portion 11 and extends from the inner periphery side to the outer periphery side of the core 30 along the Y-axis direction. The second region 122 is connected to the side of the first region 121 opposite to the side connected to the first portion 11, and is a portion that bends from extending along the Y-axis direction to extending along the Z-axis direction. The third region 123 is connected to the side of the second region 122 opposite to the side connected to the first region 121, and is a portion that extends along the Z-axis direction. The third portion 13 is connected to the third region 123 located on the side of the second portion 12 opposite to the side connected to the first portion 11. The third portion 13 extends along the X-axis direction from the second side of the core 30 toward the first side, passing through the outer periphery of the core 30.

[0022] The first portion 11, the second portion 12, and the third portion 13 are formed from a single conductor. The conductor forming the first portion 11, the second portion 12, and the third portion 13 is not particularly limited, but may be a metal with high conductivity, such as copper (pure copper), a copper alloy, aluminum, or an aluminum alloy.

[0023] The second conductor portion 19 includes a fourth portion 16, a fifth portion 17, and a sixth portion 18. The fourth portion 16 penetrates from the second side, which is the other side of the core 30, to the first side, which is one side, along the first direction α. ​​The fourth portion 16 has a flat plate shape extending linearly along the first direction α. ​​The fifth portion 17 is connected to the fourth portion 16 on the first side of the core 30. The fifth portion 17 extends from the inner periphery side to the outer periphery side of the core 30. The fifth portion 17 includes a first region 171, a second region 172, and a third region 173. The first region 171 is connected to the fourth portion 16 and extends from the inner periphery side to the outer periphery side of the core 30 along the Y-axis direction. The second region 172 is connected to the side of the first region 171 opposite to the side connected to the fourth portion 16, and is a portion that bends from extending along the Y-axis direction to extending along the Z-axis direction. The third region 173 is a portion connected to the second region 172 on the side opposite to the side connected to the first region 171, and extends along the Z-axis direction. The sixth portion 18 is connected to the third region 173 located on the side opposite to the side connected to the fourth portion 16, of the fifth portion 17. The sixth portion 18 extends along the X-axis direction from the first side to the second side of the core 30, passing along the outer periphery of the core 30.

[0024] The fourth portion 16, the fifth portion 17, and the sixth portion 18 are formed from a single conductor. The conductor forming the fourth portion 16, the fifth portion 17, and the sixth portion 18 is not particularly limited, but may be a metal with high conductivity, such as copper (pure copper), a copper alloy, aluminum, or an aluminum alloy.

[0025] The third portion 13 has an overlapping portion 13B that overlaps with the sixth portion 18 in the thickness direction (Y-axis direction) along the first direction (X-axis direction). The sixth portion 18 has an overlapping portion 18B that overlaps with the third portion 13 in the thickness direction (Y-axis direction) along the first direction (X-axis direction). The third portion 13 and the sixth portion 18 are connected by a fixing member 90 at the overlapping portions 13B, 18B. More specifically, referring to FIG. 2, the third portion 13 has a through hole 13A that passes through the overlapping portion 13B in the thickness direction (Y-axis direction). The sixth portion 18 has a through hole 18A that passes through the overlapping portion 18B in the thickness direction (Y-axis direction). The through hole 13A and the through hole 18A are arranged to overlap in the Y-axis direction. The fixing member 90 includes a bolt 91 and a nut 92. The bolt 91 passes through the through hole 13A and the through hole 18A and is screwed into the nut 92. By fastening the bolt 91 and the nut 92, the overlapping portion 13B and the overlapping portion 18B are physically and electrically connected together while being pressed against each other in the thickness direction.

[0026] The second coil portion 20 includes a first conductor portion 24 and a second conductor portion 29. The second conductor portion 29 is physically and electrically connected to the first conductor portion 24. The first conductor portion 24 includes a first portion 21, a second portion 22, and a third portion 23. The first portion 21 penetrates the core 30 along the first direction α from the second side, which is the other side, to the first side, which is one side. The first portion 21 has a flat plate shape extending linearly along the first direction α. ​​The second portion 22 is connected to the first portion 21 on the first side of the core 30. The second portion 22 extends from the inner periphery side to the outer periphery side of the core 30. The second portion 22 includes a first region 221, a second region 222, and a third region 223. The first region 221 is connected to the first portion 21 and extends from the inner periphery side to the outer periphery side of the core 30 along the Y-axis direction. The second region 222 is connected to the side of the first region 221 opposite to the side connected to the first portion 21, and is a portion that bends from extending along the Y-axis direction to extending along the Z-axis direction. The third region 223 is connected to the side of the second region 222 opposite to the side connected to the first region 221, and is a portion that extends along the Z-axis direction. The third portion 23 is connected to the third region 223 located on the side of the second portion 22 opposite to the side connected to the first portion 21. The third portion 23 extends along the X-axis direction from the first side to the second side of the core 30, passing through the outer periphery of the core 30.

[0027] The first portion 21, the second portion 22, and the third portion 23 are formed from a single conductor. The conductor forming the first portion 21, the second portion 22, and the third portion 23 is not particularly limited, but may be a metal with high conductivity, such as copper (pure copper), a copper alloy, aluminum, or an aluminum alloy.

[0028] The second conductor portion 29 includes a fourth portion 26, a fifth portion 27, and a sixth portion 28. The fourth portion 26 penetrates from a first side (i.e., one side of the core 30) to a second side (i.e., the other side) along the first direction α. ​​The fourth portion 26 has a flat plate shape extending linearly along the first direction α. ​​The fifth portion 27 is connected to the fourth portion 26 on the second side of the core 30. The fifth portion 27 extends from the inner periphery side to the outer periphery side of the core 30. The fifth portion 27 includes a first region 271, a second region 272, and a third region 273. The first region 271 is connected to the fourth portion 26 and extends from the inner periphery side to the outer periphery side of the core 30 along the Y-axis direction. The second region 272 is connected to the side of the first region 271 opposite to the side connected to the fourth portion 26, and is a portion that bends from extending along the Y-axis direction to extending along the Z-axis direction. The third region 273 is a portion connected to the second region 272 on the side opposite to the side connected to the first region 271, and extends along the Z-axis direction. The sixth portion 28 is connected to the third region 273 located on the side opposite to the side connected to the fourth portion 26, of the fifth portion 27. The sixth portion 28 extends along the X-axis direction from the second side of the core 30 toward the first side, passing through the outer periphery of the core 30.

[0029] The fourth portion 26, the fifth portion 27, and the sixth portion 28 are formed from a single conductor. The conductor forming the fourth portion 26, the fifth portion 27, and the sixth portion 28 is not particularly limited, but may be a metal with high conductivity, such as copper (pure copper), a copper alloy, aluminum, or an aluminum alloy.

[0030] The third portion 23 has an overlapping portion 23B that overlaps with the sixth portion 28 in the thickness direction (Y-axis direction) along the first direction (X-axis direction). The sixth portion 28 has an overlapping portion 28B that overlaps with the third portion 23 in the thickness direction (Y-axis direction) along the first direction (X-axis direction). The third portion 23 and the sixth portion 28 are connected by a fixing member 90 at the overlapping portions 23B, 28B. More specifically, referring to FIG. 2, the third portion 23 has a through hole 23A that passes through the overlapping portion 23B in the thickness direction (Y-axis direction). The sixth portion 28 has a through hole 28A that passes through the overlapping portion 28B in the thickness direction (Y-axis direction). The through hole 23A and the through hole 28A are arranged to overlap in the Y-axis direction. The fixing member 90 includes a bolt 91 and a nut 92. The bolt 91 passes through the through hole 23A and the through hole 28A and is screwed into the nut 92. By fastening the bolt 91 and the nut 92, the overlapping portion 23B and the overlapping portion 28B are physically and electrically connected together while being pressed against each other in the thickness direction.

[0031] 1, the second coil section 20 has a structure similar to that of the first coil section 10, rotated 180 degrees around the X-axis. In other words, the second coil section 20 is made up of the same components as the first coil section 10. As a result, the number of types of components that need to be prepared in manufacturing the common mode noise filter 1 is reduced.

[0032] The common mode noise filter 1 further includes a first connecting member 51 and a second connecting member 61 made of a conductor. The first connecting member 51 is connected to the fourth portion 26 by a fixing member 90 including a bolt 91 and a nut 92. The first connecting member 51 includes a first portion 511 connected to the fourth portion 26 and extending away from the first portion 11 along the Y-axis direction, and a second portion 512 connected to the first portion 511 and extending away from the core 30 along the X-axis direction. With reference to FIGS. 1 and 3 , the fourth portion 26 and the first portion 511 are formed with through holes 26A and 51A, respectively, that penetrate them in the thickness direction (Z-axis direction) and overlap in the Z-axis direction. A bolt 91 passes through the through hole 51A and the through hole 26A and is threadedly engaged with a nut 92. The bolt 91 and the nut 92 are fastened together to physically and electrically connect the fourth portion 26 and the first portion 511 while they are pressed against each other in the thickness direction.

[0033] The second connecting member 61 is connected to the fourth portion 16 by a fixing member 90 including a bolt 91 and a nut 92. The second connecting member 61 includes a first portion 611 connected to the fourth portion 16 and extending away from the first portion 21 along the Y-axis direction, and a second portion 612 connected to the first portion 611 and extending away from the core 30 along the X-axis direction. With reference to FIGS. 1 and 3 , the fourth portion 16 and the first portion 611 are formed with through holes 16A and 61A that penetrate therethrough in the thickness direction (Z-axis direction), respectively, so as to overlap in the Z-axis direction. A bolt 91 penetrates the through hole 61A and the through hole 16A and is threadedly engaged with a nut 92. The bolt 91 and the nut 92 are fastened together, physically and electrically connecting the fourth portion 16 and the first portion 611 while they are pressed against each other in the thickness direction.

[0034] The first portion 11 has a through hole 11A formed therethrough in the thickness direction. The second portion 512 of the first connection member 51 has a through hole 51B formed therethrough in the thickness direction. An end region of the first portion 11, including the region where the through hole 11A of the first portion 11 is formed, and an end region of the first connection member 51, including the region where the through hole 51B of the first connection member 51 is formed, can be connected to, for example, an input / output conductive member. In this case, the through hole 11A and the through hole 51B can be used for fastening using a fixing member having the same structure as the fixing member 90, including the bolt 91 and the nut 92. By using the first connection member 51, the distance in the Y-axis direction between the end region of the first portion 11 that functions as a terminal and the end region of the first connection member 51 is increased. As a result, the first portion 11 and the first connection member 51 can be easily connected to the input / output conductive member by fastening in the Z-axis direction using a bolt and a nut that pass through the through hole 11A and the through hole 51B, respectively. In view of the fact that the first connection member 51 fulfills such a function, the second portion 512 of the first connection member 51 may be omitted, and the through-hole 51B may be formed in the first portion 511.

[0035] Meanwhile, the first portion 21 has a through hole 21A formed therethrough in the thickness direction. The second portion 612 of the second connecting member 61 has a through hole 61B formed therethrough in the thickness direction. An end region of the first portion 21, including the region where the through hole 21A of the first portion 21 is formed, and an end region of the second connecting member 61, including the region where the through hole 61B of the second connecting member 61 is formed, can be connected to, for example, a conductive member on the circuit side. In this case, the through hole 21A and the through hole 61B can be used for fastening using a fixing member similar to the fixing member 90 including the bolt 91 and nut 92. By employing the second connecting member 61, the distance in the Y-axis direction between the end regions of the first portion 21 and the second connecting member 61, which function as terminals, is increased, facilitating connection to a conductive member on the circuit side.

[0036] In this embodiment, the first portions 11 and 21, the second portions 12 and 22, the third portions 13 and 23, the fourth portions 16 and 26, the fifth portions 17 and 27, and the sixth portions 18 and 28 are each made of a strip-shaped conductor. As a result, the cross-sectional area can be increased to easily accommodate a large current. Furthermore, processing such as bending to form the second regions 122, 222, 172, and 272 and cutting to form the through-holes 11A, 26A, 21A, 16A, 13A, 18A, 23A, and 28A is easy.

[0037] In this embodiment, the strip-shaped conductor has a uniform thickness. This allows the first portions 11 and 21, the second portions 12 and 22, the third portions 13 and 23, the fourth portions 16 and 26, the fifth portions 17 and 27, and the sixth portions 18 and 28 to be manufactured from metal plates, such as copper plates, having the same thickness. As a result, the number of types of materials that need to be prepared when manufacturing the common-mode noise filter 1 can be reduced.

[0038] 2 and 3, in this embodiment, the first portion 11 and the fourth portion 16 are arranged to overlap each other in the Z-axis direction with a gap G1 therebetween. The first portion 11 and the fourth portion 16 are arranged with a constant gap G1 therebetween. That is, the first portion 11 and the fourth portion 16 are arranged parallel to each other. The gap G1 between the first portion 11 and the fourth portion 16 is determined by the thickness t of the first portion 11. 11 and the thickness t of the fourth portion 16 16 is greater than.

[0039] The first portion 21 and the fourth portion 26 are arranged to overlap each other in the Z-axis direction with a distance G3 therebetween. The first portion 21 and the fourth portion 26 are arranged with a constant distance G3 therebetween. That is, the first portion 21 and the fourth portion 26 are arranged parallel to each other. The distance G3 between the first portion 21 and the fourth portion 26 is determined by the thickness t of the first portion 21. 21 and the thickness t of the fourth portion 26 26 is greater than.

[0040] 2 and 3, the first portion 11 and the fourth portion 16 of the first coil portion 10 and the first portion 21 and the fourth portion 26 of the second coil portion 20 are arranged to overlap each other in the Z-axis direction with a gap G2 between them. The first portion 11 and the fourth portion 16 of the first coil portion 10 and the first portion 21 and the fourth portion 26 of the second coil portion 20 are arranged with a constant gap G2 between them. That is, the first portion 11 and the fourth portion 16 of the first coil portion 10 and the first portion 21 and the fourth portion 26 of the second coil portion 20 are arranged parallel to each other. The gap G2 is larger than the gap G1 and the gap G3.

[0041] By arranging the first portions 11, 21 and the fourth portions 16, 26 as described above, it becomes easy to reduce the size of the core 30 in the width direction (Y-axis direction) of the first portions 11, 21 and the fourth portions 16, 26.

[0042] (Embodiment 2) Next, a second embodiment, which is another embodiment of the present disclosure, will be described. FIG. 4 is a schematic perspective view showing the structure of a coil component according to the second embodiment. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG. 4. FIGS. 4, 5, and 6 correspond to FIGS. 1, 2, and 3 of the first embodiment, respectively. Referring to FIGS. 4 to 6 and 1 to 3, the common-mode noise filter 1 of the second embodiment basically has the same structure and produces the same effects as the common-mode noise filter 1 of the first embodiment described with reference to FIGS. 1 to 3. However, the common-mode noise filter 1 of the second embodiment differs from that of the first embodiment in the shape of the core 30. The following mainly describes the differences from the first embodiment.

[0043] 4 to 6, core 30 in embodiment 2 has a hollow cylindrical shape. Referring to Fig. 5, the outer peripheral surface of main body 32 has a circular shape in a cross section (YZ plane) perpendicular to first direction α. ​​Furthermore, the wall surface (inner peripheral surface) of main body 32 surrounding through hole 30A also has a circular shape. Referring to Figs. 4 and 6, case 31 covers the entire main body 32, including the outer peripheral surface, inner peripheral surface, and both end surfaces of main body 32.

[0044] In this way, the common mode noise filter 1 of this embodiment, which employs the core 30 having a hollow cylindrical shape, can also provide a common mode noise filter that exhibits the same effects as the above-described first embodiment. By employing the hollow cylindrical core 30, it becomes easy to manufacture a core 30 with high magnetic permeability. As a result, it becomes easy to obtain a high-performance common mode noise filter 1.

[0045] (Embodiment 3) Next, a third embodiment of the present disclosure will be described. FIG. 7 is a schematic perspective view showing the structure of a coil component according to the third embodiment. FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. 7. FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 7. FIGS. 7, 8, and 8 correspond to FIGS. 1, 2, and 3 of the first embodiment, respectively. Referring to FIGS. 7 to 9 and 1 to 3, the common-mode noise filter 1 of the third embodiment basically has the same structure and produces the same effects as the common-mode noise filter 1 of the first embodiment described with reference to FIGS. 1 to 3. However, the common-mode noise filter 1 of the third embodiment differs from the first embodiment in the shape of the core 30 and the positional relationship between the first coil portion 10 and the second coil portion 20. The following mainly describes the differences from the first embodiment.

[0046] 7 to 9, core 30 in the third embodiment has a shape in which the width in the Y-axis direction is greater than that in the Z-axis direction. Referring to Fig. 8, the outer circumferential surface of main body 32 has a rectangular shape with four arc-shaped corners and long sides in the Y-axis direction and short sides in the Z-axis direction in a cross section perpendicular to first direction α (YZ plane). Furthermore, the wall surface (inner circumferential surface) of main body 32 surrounding through hole 30A has four arc-shaped corners and a rectangular shape with long sides in the Y-axis direction and short sides in the Z-axis direction.

[0047] 7 and 8, the first portion 11 and the fourth portion 16 of the first coil portion 10 and the first portion 21 and the fourth portion 26 of the second coil portion 20 are arranged side by side with a gap G2 between them in the width direction (Y-axis direction). The first portion 11 and the fourth portion 16 of the first coil portion 10 and the first portion 21 and the fourth portion 26 of the second coil portion 20 are arranged with a constant gap G2 between them. In other words, the first portion 11 and the fourth portion 16 of the first coil portion 10 and the first portion 21 and the fourth portion 26 of the second coil portion 20 are arranged parallel to each other. The gap G2 is larger than the gap G1 and the gap G3.

[0048] By arranging the first portions 11, 21 and the fourth portions 16, 26 as described above, it becomes easy to reduce the size of the core 30 in the thickness direction (Z-axis direction) of the first portions 11, 21 and the fourth portions 16, 26.

[0049] (Fourth embodiment) Next, a fourth embodiment, which is yet another embodiment of the present disclosure, will be described. Fig. 10 is a schematic perspective view showing the structure of a coil component according to the fourth embodiment. Fig. 11 is a schematic cross-sectional view taken along line XI-XI in Fig. 10. Figs. 10 and 11 correspond to Figs. 7 and 9 of the third embodiment, respectively. With reference to Figs. 10 to 11 and 7 to 9, the common-mode noise filter 1 of the fourth embodiment basically has the same structure and produces the same effects as the common-mode noise filter 1 of the third embodiment described with reference to Figs. 7 to 9. However, the common-mode noise filter 1 of the fourth embodiment differs from the third embodiment in that it includes multiple cores. The following mainly describes the differences from the third embodiment.

[0050] 10 and 11, the common mode noise filter 1 according to the fourth embodiment includes a core 30 as a first core and a core 40 as a second core. The common mode noise filter 1 according to the fourth embodiment includes two cores 30, 40. The cores 30 and 40 are arranged side by side in the first direction α (X-axis direction). In the present embodiment, the cores 30 and 40 have the same shape and are made of the same material, but the common mode noise filter according to the present disclosure is not limited to this. The cores 30 and 40 may have different shapes (for example, different sizes). The cores 30 and 40 may be made of different materials.

[0051] The core 40 has an annular shape, similar to the core 30. The core 40 has a through-hole 40A that penetrates the core 40 in the first direction α (X-axis direction). The core 40 includes a main body 42 and a case 41. The main body 42 has an annular shape. The main body 42 is made of a magnetic material, similar to the main body 32. The case 41 covers the entire main body 42, including the outer peripheral surface, inner peripheral surface, and both end surfaces of the main body 42. The case 41 may be made of two parts that can be separated in the X-axis direction. The case 41 is made of resin.

[0052] The first portion 11 of the first conductor 14 penetrates from the first side, which is one side of the core 40, to the second side, which is the other side, along the first direction α. ​​The second portion 12 is connected to the first portion 11 on the second side of the core 40. The second portion 12 extends from the inner peripheral side to the outer peripheral side of the core 40. The first region 121 of the second portion 12 extends from the inner peripheral side to the outer peripheral side of the core 40 along the Y-axis direction. The third portion 13 extends from the second side to the first side of the core 40, passing through the outer peripheral side of the core 40, along the X-axis direction. The fourth portion 16 of the second conductor 19 penetrates from the second side, which is the other side of the core 40, to the first side, which is one side, along the first direction α.

[0053] The first portion 21 of the first conductor 24 penetrates from the second side, which is the other side of the core 40, to the first side, which is one side, along the first direction α. ​​The fourth portion 26 of the second conductor 29 penetrates from the first side, which is one side of the core 40, to the second side, which is the other side, along the first direction α. ​​The fifth portion 27 is connected to the fourth portion 26 on the second side of the core 40. The fifth portion 27 extends from the inner peripheral side to the outer peripheral side of the core 40. The first region 271 of the fifth portion 27 is connected to the fourth portion 26 and extends from the inner peripheral side to the outer peripheral side of the core 40 along the Y-axis direction. The sixth portion 28 extends from the second side to the first side of the core 40, passing through the outer peripheral side of the core 40, along the X-axis direction.

[0054] The common mode noise filter 1 of this embodiment includes multiple (specifically, two) cores 30, 40, which makes it easy to improve magnetic characteristics. Furthermore, the common mode noise filter 1 of this embodiment includes multiple (specifically, two) cores 30, 40, which makes it easy to achieve magnetic characteristics that are difficult to achieve with only one core. For example, when cores 30, 40 having the same shape and made of the same material are used, the impedance can be approximately doubled compared to when only one core 30 is used.

[0055] (Embodiment 5) Next, a fifth embodiment, which is yet another embodiment of the present disclosure, will be described. FIG. 12 is a schematic perspective view showing the structure of a coil component according to the fifth embodiment. FIG. 13 is a schematic cross-sectional view taken along line XIII-XIII in FIG. 12. FIG. 14 is a schematic cross-sectional view taken along line XVI-XVI in FIG. 12. FIGS. 12, 13, and 14 correspond to FIGS. 7, 8, and 9 of the third embodiment, respectively. Referring to FIGS. 12 to 14 and 7 to 9, the common-mode noise filter 1 of the fifth embodiment basically has the same structure and produces the same effects as the common-mode noise filter 1 of the third embodiment described with reference to FIGS. 7 to 9. However, the common-mode noise filter 1 of the fifth embodiment differs from the third embodiment in that the first coil portion 10 and the second coil portion 20 each have an insulating layer 71. The following mainly describes the differences from the third embodiment.

[0056] 12 to 14, portions of the first coil portion 10 and the second coil portion 20 of the common mode noise filter 1 according to the fifth embodiment are covered with an insulating layer 71. The insulating layer 71 is made of, for example, a resin. The entire first coil portion 10 and the second coil portion 20 may be covered with the insulating layer 71. However, in the present embodiment, at least the portions of the first coil portion 10 and the second coil portion 20 facing the inner circumferential surface and the end surface of the core 30 are covered with the insulating layer 71, while the periphery of the connection portion with the bolt and nut is not covered with the insulating layer 71. The first portion 11 and the fourth portion 26 may be covered with a single resin. The fourth portion 16 and the first portion 21 may be covered with a single resin.

[0057] According to the common mode noise filter 1 of this embodiment, at least a portion of the first coil portion 10 and the second coil portion 20 is covered with the insulating layer 71, and therefore, the withstand voltage between the coil portions 10, 20 and the core 30 and the insulation between the portions constituting the coil portions 10, 20 are reduced. pressure resistance can be improved.

[0058] In the above embodiment, the third portion and the sixth portion are connected at the overlapping portion by a fixing member 90 including a bolt 91 and a nut 92. However, the connection method for the coil component of the present disclosure is not limited to this. The third portion and the sixth portion may be connected by other methods, such as crimping, welding, or soldering.

[0059] In the above embodiment, the first conductor portion and the second conductor portion are described as being made of a strip-shaped conductor (a strip-shaped bus bar). However, the first conductor portion and the second conductor portion of the coil component of the present disclosure are not limited to this configuration. The first conductor portion and the second conductor portion may be made of any material that can handle a large current, such as a round wire or a rectangular wire whose cross section perpendicular to the longitudinal direction is circular or rectangular, or may be a wire bundle such as a twisted wire.

[0060] In the above embodiment, the core and the core body have an annular shape, i.e., a shape that is continuous in the circumferential direction, but the shapes of the core and the core body are not limited to this. The core and the core body may have, for example, a shape in which a portion in the circumferential direction is removed from the annular shape, i.e., a shape in which a notch is formed connecting the annular through hole and the outer circumferential surface (a C-shape when viewed in the first direction).

[0061] 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 invention is defined not by the above description but by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0062] 1 common mode noise filter, 10 first coil part, 11 first part, 11A through hole, 12 second part, 13 third part, 13A through hole, 13B overlapping part, 14 first conductor part, 16 fourth part, 16A through hole, 17 fifth part, 18 sixth part, 18A through hole, 18B overlapping part, 19 second conductor part, 20 second coil part, 21 first part, 21A through hole, 22 second part, 23 third part, 23A through hole, 23B overlapping part, 24 first conductor part, 26 fourth part, 26A through hole, 27 fifth part, 28 sixth part, 28A through hole, 28B overlapping part, 29 second conductor part, 30 core, 30A through hole, 31 case, 32 main body part, 40 core, 40A through hole, 41 Case, 42 main body portion, 51 first connecting member, 51A through hole, 51B through hole, 61 second connecting member, 61A through hole, 61B through hole, 71 insulating layer, 90 fixing member, 91 bolt, 92 nut, 121 first region, 122 second region, 123 third region, 171 first region, 172 second region, 173 third region, 221 first region, 222 second region, 223 third region, 271 first region, 272 second region, 273 third region, 511 first portion, 512 second portion, 611 first portion, 612 second portion, α first direction.

Claims

1. a core having a through hole; a coil portion that passes through the through hole and is wound around the core, The coil portion a first conductor portion; a second conductor connected to the first conductor, The first conductor portion is a first portion that penetrates from a first side to a second side along a first direction that is a penetration direction of the through hole; a second portion connected to the first portion on the second side and extending from the inner peripheral side to the outer peripheral side of the core; a third portion connected to the second portion on the side opposite to the side connected to the first portion, and extending through an outer circumferential side of the core toward the first side, The second conductor portion is a fourth portion penetrating from the second side to the first side along the first direction; a fifth portion connected to the fourth portion on the first side and extending from the inner peripheral side to the outer peripheral side of the core; a sixth portion connected to the fifth portion on a side opposite to the side connected to the fourth portion, and extending through an outer circumferential side of the core toward the second side, the third portion and the sixth portion have overlapping portions that overlap with each other along the first direction and are connected to each other at the overlapping portions, the first portion, the second portion, the third portion, the fourth portion, the fifth portion, and the sixth portion are each made of a strip-shaped conductor, the first portion and the fourth portion are arranged to be spaced apart from each other and to overlap at least partially in a thickness direction; the coil component includes a pair of coil portions including a first coil portion and a second coil portion, the first portion and the fourth portion of the first coil portion and the first portion and the fourth portion of the second coil portion are arranged side by side at intervals in the width direction, a coil component, wherein the distance between the first and fourth portions of the first coil portion and the first and fourth portions of the second coil portion is greater than both the distance between the first and fourth portions of the first coil portion and the distance between the first and fourth portions of the second coil portion.

2. The coil component according to claim 1 , wherein the strip-shaped conductor has a constant thickness.

3. the first portion, the second portion, and the third portion are formed from a single conductor; The coil component according to claim 1 , wherein the fourth portion, the fifth portion, and the sixth portion are formed from a single conductor.

4. The core is a main body made of a magnetic material; The coil component according to claim 1 , further comprising: a resin case covering a surface of the main body portion.

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