Coil device

Abstract

To provide a coil device capable of preventing misalignment of the coil. [Solution] The coil device 1 comprises a plate-shaped wire 2 having a coil portion 20 and a lead portion 21a drawn out from the coil portion 20, a core 3a arranged around the coil portion 20, a housing portion 41 that houses the coil portion along a housing direction perpendicular to the winding axis direction of the coil portion 20, a core support portion 42 connected to one end of the housing portion 41 in the housing direction and supporting the core 3a, and a coil support portion that supports the outer circumferential surface of the coil portion 20. The housing portion 41 covers at least a portion of the outer circumferential surface of the coil portion 20.

Description

Technical Field

[0004]

[0001] The present disclosure relates to a coil device.

Background Art

[0002] For example, Patent Document 1 discloses a coil device having a plate-shaped coil and a core disposed around the coil. The main leg portion of the core is inserted inside the coil, whereby the coil is attached to the core. Since the coil device of Patent Document 1 has a plate-shaped coil, miniaturization and thinning of the coil device can be achieved.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the coil device of Patent Document 1, since the main leg portion of the core is inserted inside the coil, when the dimensional accuracy of the main leg portion of the core is low, a problem occurs in that the position of the coil is unstable.

[0005] The present disclosure provides a coil device capable of preventing displacement of the coil.

Means for Solving the Problems

[0006] The coil device of the present disclosure includes a plate-shaped wire having a coil portion and a lead-out portion drawn from the coil portion, a core disposed around the coil portion, a case having a housing portion that houses the coil portion along a housing direction perpendicular to the winding axis direction of the coil portion, a core support portion connected to one end of the housing portion in the housing direction and supporting the core, and a coil support portion that supports the outer peripheral surface of the coil portion. The housing portion covers at least a part of the outer surface of the coil portion. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a perspective view of the coil device of the first embodiment. [Figure 2] Figure 2 is an exploded perspective view of the coil device shown in Figure 1. [Figure 3] Figure 3 is a perspective view of the case shown in Figure 2. [Figure 4] Figure 4 is a plan view of the coil device shown in Figure 1. [Figure 5] Figure 5 is a cross-sectional view along the VV line shown in Figure 1. [Figure 6] Figure 6 is a cross-sectional view along the line VI-VI shown in Figure 1. [Figure 7] Figure 7 is a perspective view of the coil device of the second embodiment. [Figure 8] Figure 8 is an exploded perspective view of the coil device shown in Figure 7. [Figure 9] Figure 9 is a perspective view of the coil device shown in Figure 7, with the core omitted. [Figure 10] Figure 10 is a perspective view of the case shown in Figure 8. [Figure 11] Figure 11 is a cross-sectional view along the line XI-XI shown in Figure 7. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described below with reference to the drawings. Note that the illustrations are for illustrative purposes only to aid in understanding the present invention, and the appearance and dimensional ratios may differ from those of the actual product. Furthermore, the present invention is not limited to the following embodiments.

[0009] (First Embodiment) The coil device 1 of the first embodiment shown in Figure 1 functions, for example, as an inductor and is implemented in the power supply circuit of an electrical device. The coil device 1 has at least a wire 2, cores 3a to 3b, and a case 4.

[0010] As shown in Figure 2, the wire 2 has a coil portion 20 and lead portions 21a to 21b drawn out from the coil portion 20. The coil portion 20 is an air-core coil and is formed by winding the wire 2 in a spiral shape. The wire 2 is a plate-shaped wire, made by edgewise winding of a flat rectangular wire. However, the wire 2 may also be made by flatwise winding of a flat rectangular wire. The lead portion 21a is one end of the wire 2, and the lead portion 21b is the other end of the wire 2.

[0011] Wire 2 is, for example, an insulated wire. Wire 2 is a known wound wire such as AIW (polyamide-imide copper wire), UEW (polyurethane copper wire), or PEW (polyester copper wire). Wire 2 is a flat wire, but may also be a square wire, round wire, stranded wire, Litz wire, braided wire, etc. The material constituting the core of wire 2 is not particularly limited, but may be, for example, copper, copper alloy, silver, or nickel. The thickness of wire 2 (length from one main surface of wire 2 to the other main surface) is not particularly limited, but may be, for example, 20 μm to 200 μm. The width of wire 2 is not particularly limited, but may be, for example, 40 μm to 400 μm.

[0012] Cores 3a and 3b are formed from a material containing a magnetic material and a resin. The magnetic material constituting cores 3a and 3b is not particularly limited, but may be, for example, ferrite (Ni-Zn ferrite, Mn-Zn ferrite, etc.) or metallic magnetic material (Fe-Ni alloy, Fe-Si alloy, Fe-Si-Cr alloy, Fe-Co alloy, Fe-Si-Al alloy, amorphous iron, etc.). The resin constituting cores 3a and 3b is not particularly limited, but may be epoxy resin, phenolic resin, polyester resin, polyurethane resin, polyimide resin, etc. Cores 3a and 3b may also be sintered bodies of metallic magnetic material.

[0013] The cores 3a and 3b are both E-shaped cores and are arranged around the coil part 20. The cores 3a and 3b have the same shape, but may have different shapes. The cores 3a and 3b each have a base part 30, a pair of outer leg parts 31, and a middle leg part 32.

[0014] Hereinafter, an axis along the direction in which the cores 3a and 3b face each other is defined as the X-axis. Also, an axis along the direction in which the pair of outer leg parts 31 face each other is defined as the Y-axis. The Z-axis is an axis perpendicular to the X-axis and the Y-axis. The X-axis corresponds to the winding axis direction of the coil part 20. The X-axis, Y-axis, and Z-axis are perpendicular to each other.

[0015] In the present disclosure, the positive direction side of the Z-axis is defined as "upward", and the negative direction side of the Z-axis is defined as "downward". However, the upward direction in the Z-axis direction does not necessarily coincide with the upward direction in the vertical direction. Also, the downward direction in the Z-axis direction does not necessarily coincide with the downward direction in the vertical direction.

[0016] The pair of outer leg parts 31 are located at both ends of the base part 30 in the X-axis direction and protrude from the base part 30. The middle leg part 32 is located between the pair of outer leg parts 31 and protrudes from the base part 30. The outer leg parts 31 and the middle leg part 32 are not particularly limited, but protrude in a direction perpendicular to the base part 30.

[0017] However, in the present disclosure, the term "perpendicular" does not refer only to the concept of strict perpendicularity, but also includes a state in which an error of ±Δθ° (not particularly limited, for example, Δθ = 3) or less occurs with respect to strict perpendicularity. Also, the term "parallel" does not refer only to the concept of strict parallelism, but also includes a state in which an error of ±Δθ° (not particularly limited, for example, Δθ = 3) or less occurs with respect to strict parallelism.

[0018] The cross-sectional shape (a cross-section perpendicular to the X-axis) of the outer leg part 31 is rectangular, but it may be square, other polygons, circular, elliptical, or other shapes. Also, the cross-sectional shape of the middle leg part 32 is circular, but it may be elliptical, square, rectangular, other polygons, or other shapes.

[0019] One of cores 3a and 3b may be an E-type core and the other an I-type core. Furthermore, each of cores 3a and 3b may be composed of multiple cores. For example, core 3a may be composed of multiple I-type cores arranged in an E-shape. Alternatively, core 3a may be composed of a U-type core and an I-type core arranged in an E-shape. The same applies to core 3b.

[0020] When cores 3a and 3b are attached to the case 4, the tips of the pair of outer legs 31 of core 3a are in contact with the tips of the pair of outer legs 31 of core 3b. However, a gap may be formed between the tips of the pair of outer legs 31 of core 3a and the pair of outer legs 31 of core 3b. Also, when cores 3a and 3b are attached to the case 4, a gap is formed between the tips of the middle legs 32 of core 3a and the tips of the middle legs 32 of core 3b. However, the tips of the middle legs 32 of core 3a are in contact with the tips of the middle legs 32 of core 3b.

[0021] Case 4 is made of a plastic such as PPS, PET, PBT, or LCP, or other insulating material. Case 4 has a housing section 41, a core support section 42, and a coil support section 43 (Figure 3). The housing section 41 houses the coil section 20 along a direction (Z-axis direction) perpendicular to the winding axis direction (X-axis direction) of the coil section 20. Hereinafter, the direction in which the coil section 20 is housed (inserted) into the housing section 41 (Z-axis direction) may be referred to as the "housing direction".

[0022] As shown in Figures 4 and 5, the housing section 41 covers at least a portion of the outer surface of the coil section 20. As shown in Figure 2, the housing section 41 has a wall 410, a housing opening 411, a connecting passage 412, and a flange 413. The wall 410 has a cylindrical shape. The cross-sectional shape (cross-section perpendicular to the Z-axis) of the wall 410 is rectangular, but it may be a square, other polygon, circle, ellipse, or other shape. The coil section 20 can be housed (inserted) inside the wall 410.

[0023] The wall 410 has a first portion 410a, a second portion 410b, a third portion 410c, and a fourth portion 410d. The first portion 410a and the second portion 410b face each other in the X-axis direction, and the third portion 410c and the fourth portion 410d face each other in the Y-axis direction. As shown in Figures 4 and 5, the third portion 410c and the fourth portion 410d of the wall 410 at least partially cover the outer circumferential surface of the coil portion 20 from a direction perpendicular to the winding axis direction of the coil portion 20 (Y-axis direction).

[0024] As shown in Figure 2, the housing opening 411 is an opening for housing (inserting) the coil portion 20 into the housing portion 41, and is located at the upper end of the wall 411. The connecting passage 412 is a passage for inserting at least a portion of the core 3a or 3b (in this embodiment, the middle leg portion 32) into the housing portion 41 along the winding axis direction of the coil portion 20. Multiple (in this embodiment, two) perforated connecting passages 412 are formed in the wall 410. One connecting passage 412 penetrates the first portion 410a of the wall 411 along the winding axis direction of the coil portion 20. The other connecting passage 412 penetrates the second portion 410b of the wall 410 along the winding axis direction of the coil portion 20. The shape of the connecting passage 412 as viewed from the X-axis direction corresponds to the cross-sectional shape of the middle leg portion 32 of the core 3a or 3b, and is circular in the example shown in Figure 2.

[0025] As shown in Figure 6, the middle leg portion 32 of the core 3a can be housed inside the housing portion 41 through the connecting passage 412 of the first portion 410a. Also, the middle leg portion 32 of the core 3b can be housed inside the housing portion 41 through the connecting passage 412 of the second portion 410b.

[0026] With cores 3a and 3b mounted on case 4, the first portion 410a faces the base portion 30 of core 3a, and the second portion 410b faces the base portion 30 of core 3b. As shown in Figure 5, one outer leg portion 31 of core 3b faces the third portion 410c, and the other outer leg portion 31 of core 3b faces the third portion 410c. Although not shown in detail, one outer leg portion 31 of core 3a faces the third portion 410c, and the other outer leg portion 31 of core 3a faces the third portion 410c.

[0027] As shown in Figure 4, the length L1 along the Y-axis from the third portion 410c to the fourth portion 410d is longer than the length (diameter) L2 of the coil portion 20 along the Y-axis. Therefore, a gap is formed between the outer surface of the coil portion 20 and the third portion 410c. A gap is also formed between the outer surface of the coil portion 20 and the fourth portion 410d. The position of the coil portion 20 in the Y-axis direction is limited to within the range of the gap between the outer surface of the coil portion 20 and the third portion 410c or the gap between the outer surface of the coil portion 20 and the fourth portion 410d. This prevents displacement of the coil portion 20 in the Y-axis direction.

[0028] The length L1 along the Y-axis from the third section 410c to the fourth section 410d is longer than the maximum length along the Y-axis from the drawer section 21a to the drawer section 21b. However, in this embodiment, the maximum length along the Y-axis from the drawer section 21a to the drawer section 21b is equal to the length (diameter) L2 of the coil section 20 along the Y-axis. Therefore, a gap is formed between the drawer section 21a and the third section 410c. Also, a gap is formed between the drawer section 21b and the fourth section 410d. The position of the drawer section 21a in the Y-axis direction is limited to within the range of the gap between the drawer section 21a and the third section 410c. Also, the position of the drawer section 21b in the Y-axis direction is limited to within the range of the gap between the drawer section 21b and the fourth section 410d. This prevents misalignment of the drawer sections 21a and 21b with respect to the Y-axis direction. Furthermore, the third portion 410c and the fourth portion 410d function as stoppers, preventing the drawer sections 21a and 21b from rotating.

[0029] In this disclosure, "equal" does not refer only to a state in which the physical quantities of multiple objects being compared are exactly equal, but also includes a state in which there is an error of ±Δ% (not particularly limited, but for example Δ=7, 5, or 3) or less between the physical quantities of multiple objects being compared.

[0030] The length L3 along the X-axis from the first section 410a to the second section 410b is longer than the length (thickness) L4 of the coil section 20 along the X-axis. Therefore, a gap is formed between one end of the coil section 20 in the winding axis direction and the first section 410a. Similarly, a gap is formed between the other end of the coil section 20 in the winding axis direction and the second section 410b. The position of the coil section 20 in the X-axis direction is limited to within the range of the gap between one end of the coil section 20 in the winding axis direction and the first section 410a, or the gap between the other end of the coil section 20 in the winding axis direction and the second section 410b. This prevents misalignment of the coil section 20 with respect to the X-axis direction.

[0031] The length L3 along the X-axis from the first section 410a to the second section 410b is longer than the maximum length along the X-axis from the drawer section 21a to the drawer section 21b. However, the maximum length along the X-axis from the drawer section 21a to the drawer section 21b is equal to the length (thickness) L4 of the coil section 20 along the X-axis. Therefore, a gap is formed between the drawer section 21a and the first section 410a. Also, a gap is formed between the drawer section 21b and the second section 410b. The position of the drawer section 21a in the X-axis direction is limited to within the range of the gap between the drawer section 21a and the first section 410a. Also, the position of the drawer section 21b in the X-axis direction is limited to within the range of the gap between the drawer section 21b and the second section 410b. This prevents misalignment of the drawer sections 21a and 21b with respect to the X-axis direction.

[0032] As shown in Figure 1, at least a portion of the pull-out section 21a protrudes from the housing section 41 along the housing direction (the direction in which the coil section 20 is housed in the housing section 41). Also, at least a portion of the pull-out section 21b protrudes from the housing section 41 along the housing direction.

[0033] As shown in Figure 2, the flange 413 is located at the upper end of the wall 410 and protrudes outward from the wall 410 along a direction perpendicular to the axial direction of the wall 410. When the cores 3a and 3b are attached to the case 4, the flange 413 functions as a stopper that restricts upward displacement of the cores 3a and 3b.

[0034] The core support section 42 is connected to one end of the housing section 41 in the housing direction (Z-axis direction) and supports the cores 3a and 3b. The core support section 42 has a base 420, a base opening 421 (Figure 3), and leg sections 422a to 422d.

[0035] The base 420 is connected to the lower end of the wall 410 and protrudes outward from the wall 410 along a direction perpendicular to the axial direction of the wall 410. The base 420 has a ring shape. The upper surface of the base 420 is flat so that at least a portion of the core 3a (in the example shown in Figure 2, the base portion 30 and the outer leg portion 31) and at least a portion of the core 3b (in the example shown in Figure 2, the base portion 30 and the outer leg portion 31) can be positioned. As shown in Figure 1, the base 420 supports the cores 3a and 3b. The cores 3a and 3b are positioned between the flange portion 413 and the base 420.

[0036] As shown in Figure 3, the base opening 421 is located inside the base 420. Through the base opening 421, the core support portion 42 communicates with the housing portion 41. A portion of the base opening 421 is blocked by the coil support portion 43.

[0037] The legs 422a to 422d are formed on the bottom surface of the base 420 and protrude from the base 420 toward the direction away from the housing 41 (downward). In the example shown in Figure 3, there are four legs, but there may be two, three, or five or more. The legs 422a to 422d are located at the four corners of the base 420, but they may also be located at positions other than the corners of the base 420. In the example shown in Figure 3, the shape of each of the legs 422a to 422d as viewed from the Z-axis direction is L-shaped. Each of the legs 422a to 422d extends so as to bend along the outer circumference of the base 420.

[0038] Leg portion 422b is spaced apart from leg portion 422a, and a gap 423 is formed between leg portion 422a and leg portion 422b. Leg portion 422c is spaced apart from leg portion 422b, and a gap 423 is formed between leg portion 422b and leg portion 422c. Leg portion 422d is spaced apart from leg portion 422c, and a gap 423 is formed between leg portion 422c and leg portion 422d. Leg portion 422d is spaced apart from leg portion 422a, and a gap 423 is formed between leg portion 422a and leg portion 422d. There are four gaps 423, but there may be two, three, or five or more. A part of the coil support portion 43 is positioned in the gap 423 between leg portion 422b and leg portion 422c. Furthermore, a portion of the coil support portion 43 is positioned in the gap 423 between the leg portion 422a and the leg portion 422d.

[0039] When cooling air is directed toward the coil device 1, at least a portion of the cooling air flows from the gap 423 toward the base opening 421, and from the base opening 421 toward the housing opening 411. Alternatively, at least a portion of the cooling air flows from the housing opening 411 toward the base opening 421, and from the base opening 421 toward the gap 423.

[0040] In this embodiment, the gap 423 (or the housing opening 411) serves as an inlet for introducing cooling air into the case 4, while the housing opening 411 (or the gap 423) serves as an outlet for leading the cooling air to the outside of the case 4. Therefore, a flow path for the cooling air is formed from the gap 423 to the housing opening 421, passing through the base opening 421.

[0041] The coil support portion 43 extends from one side of the base 420 in the X-axis direction to the other side, bridging one side of the base opening 421 along the X-axis. However, the shape of the coil support portion 43 is not limited to the shape shown in Figure 3; the coil support portion 43 may be a cantilever beam projecting from one side of the base 420 in the X-axis direction to the other side. Viewed from the Z-axis direction, the coil support portion 43 is located inside the base opening 421. In the example shown in Figure 3, a portion of the coil support portion 43 is formed on the bottom surface of the base 420.

[0042] As shown in Figure 5, the coil support portion 43 partially contacts the outer circumferential surface of the coil portion 20 and supports the outer circumferential surface of the coil portion 20. The coil support portion 43 plays a role in adjusting the height position of the coil portion 20 by supporting the coil portion 20. For example, the coil portion 20 is positioned at a height such that the center of the coil portion 20 and the center of the middle leg portion 32 coincide when viewed from the X-axis direction. In this case, a gap is formed between the outer circumferential surface of the middle leg portion 32 and the inner circumferential surface of the coil portion 20.

[0043] The upper surface of the coil support portion 43 (the surface that the outer circumferential surface of the coil portion 20 contacts) is located below the bottom surface of the base 420. Therefore, when the coil portion 20 is placed on the coil support portion 43, a part of the coil portion 20 (the lower part) protrudes downward from the bottom surface of the base 420. On the other hand, the upper part of the coil portion 20 does not protrude from the housing opening 411, but is contained within the housing portion 41.

[0044] Next, the manufacturing method of the coil device 1 will be described. First, the coil section 20 is housed inside the housing section 41 shown in Figure 2, and the coil section 20 is placed on the coil support section 43 shown in Figure 5. The pull-out sections 21a and 21b are made to protrude at least partially from the outside of the housing section 41. Next, the middle leg sections 32 of the cores 3a and 3b are inserted into the housing section 41 through the connecting passage 412 shown in Figure 2. The base section 30 and outer leg sections 31 of the cores 3a and 3b are then placed on the base 420 of the core support section 42. In this way, the coil device 1 can be manufactured.

[0045] As shown in Figure 1, in the coil device 1 of this embodiment, the case 4 has a housing portion 41 that houses the coil portion 20 along a housing direction (Z-axis direction) perpendicular to the winding axis direction of the coil portion 20. The housing portion 41 covers at least a portion of the outer circumferential surface of the coil portion 20. Therefore, the housing portion 41 restricts the position of the outer circumferential surface of the coil portion 20, making it easier to stabilize the position of the coil portion 20. Furthermore, as shown in Figure 5, the case 4 has a coil support portion 43 that supports the outer circumferential surface of the coil portion 20. The coil support portion 43 supports the outer circumferential surface of the coil portion 20, further stabilizing the position of the coil portion 20. This prevents displacement of the coil portion 20.

[0046] Furthermore, as shown in Figures 2 and 5, the housing section 41 has a connecting passage 412 along the winding axis direction of the coil section 20 for inserting at least a portion of the core 3b (the middle leg portion 32) into the housing section 41. As a result, at least a portion of the core 3b can be placed inside the coil section 20 through the connecting passage 412, improving the inductance characteristics of the coil device 1.

[0047] Furthermore, the housing section 41 has a cylindrical wall 410. The housing section 41 has a housing opening 411 for housing the coil section 20, and a hole-shaped communication passage 412 that penetrates the wall 410 in the direction of the winding axis of the coil section 20. By housing the coil section 20 in the cylindrical housing section 41, at least a portion of the outer surface of the coil section 20 is covered by the housing section 41, effectively preventing displacement of the coil section 20. In addition, the coil section 20 can be easily housed in the housing section 41 through the housing opening 411. Furthermore, at least a portion of the core 3a can be housed in the housing section 41 through the communication passage 412, improving the inductance characteristics of the coil device 1.

[0048] Furthermore, as shown in Figures 3 and 5, the core support portion 42 has a ring-shaped base 420 and a base opening 421 located inside the base 420. The core 3b is also positioned on the base 420. When viewed from the housing direction (the direction in which the coil portion 20 is housed in the housing portion 41), the coil support portion 43 is located inside the base opening 421. By positioning the core 3a on the base 420, displacement of the core 3a can be prevented. In addition, cooling air can be flowed through the base opening 421 towards the coil portion 20 housed in the housing portion 41.

[0049] Furthermore, the core support portion 42 has a plurality of legs 422a and 422b that protrude from the base 420 in a direction away from the housing portion 41. A gap 423 is formed between the plurality of legs 422a and 422b. Therefore, when cooling air is blown toward the coil device 1, at least a portion of the cooling air flows toward the coil portion 20 through the gap 423 and the base opening 421. This makes it possible to increase the cooling efficiency of the coil portion 20.

[0050] Furthermore, at least a portion of the pull-out section 21a protrudes from the housing section 41 along the housing direction (the direction in which the coil section 20 is housed in the housing section 41). As a result, the mounting area of ​​the coil device 1 is reduced, and high-density mounting of the coil device 1 can be achieved.

[0051] (Second Embodiment) The coil device 1A of the second embodiment shown in Figure 7 has the same configuration as the coil device 1 of the first embodiment, except for the points described below. Parts that overlap with the coil device 1 of the first embodiment are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0052] As shown in Figure 7, coil device 1A differs from coil device 1 of the first embodiment in that it has a case 4A. As shown in Figure 8, case 4A has a housing section 41A. Housing section 41A has a wall 410A, a connecting passage 412A, and through holes 414a to 414b.

[0053] The wall 410A has a curved portion 415 and a pair of side walls 416. The curved portion 415 is curved in an arc shape (C-shape) along the outer circumferential surface of the coil portion 20. The bottom (lower end) of the curved portion 415 is connected to the core support portion 42. The pair of side walls 416 are located at both ends of the curved portion 415 in the X-axis direction and protrude inward from the curved portion 415 along the radial direction of the curved portion 415. As shown in Figure 9, the pair of side walls 416 restrict the position of the coil portion 20 housed in the housing portion 41A in the X-axis direction.

[0054] As shown in Figure 8, the connecting passage 412A is formed along the side wall 416 and is curved in an arc shape (C-shape) according to the shape of the curved portion 415. The middle leg portion 32 of the core 3a is housed inside the housing portion 41A along the winding axis direction of the coil portion 20 via the connecting passage 412A. Similarly, the middle leg portion 32 of the core 3b is housed inside the housing portion 41A along the winding axis direction of the coil portion 20 via the connecting passage 412A.

[0055] As shown in Figure 9, the coil portion 20 is housed inside the housing portion 41A. The coil portion 20 is housed inside the housing portion 41A along the housing direction (Z-axis direction). The curved portion 415 covers at least the lower part of the outer circumferential surface of the coil portion 20 housed in the housing portion 41A. In this embodiment, the diameter of the coil portion 20 is greater than the maximum length along the Y-axis from the lead portion 21a to the lead portion 21b.

[0056] As shown in Figures 8 and 10, the through holes 414a and 414b penetrate the curved portion 415. Therefore, when cooling air is blown toward the coil device 1, at least a portion of the cooling air flows into the interior of the housing portion 41A through the base opening 421 and the through holes 414a. Also, at least a portion of the cooling air flows into the interior of the housing portion 41A through the base opening 421 and the through holes 414b. This allows at least a portion of the core 3a or 3b housed in the housing portion 41A to be cooled.

[0057] As shown in Figure 11, a gap is formed between the outer circumferential surface of the coil portion 20 and the curved portion 415, extending intermittently along the outer circumferential surface of the coil portion 20 and / or the curved portion 415. The position of the coil portion 20 is limited to within the range of the gap between the outer circumferential surface of the coil portion 20 and the curved portion 415. This allows the coil portion 20 to be positioned in the Y-axis direction. Note that the gap between the outer circumferential surface of the coil portion 20 and the curved portion 415 is discontinuous at the contact point between the coil portion 20 and the coil support portion 43.

[0058] In the example shown in Figure 11, when viewed from the X-axis direction, the inner circumferential surface of the outer leg portion 31 of the core 3b is curved in an arc shape (C-shape) along the outer circumferential surface of the coil portion 20. Although detailed illustration is omitted, when viewed from the X-axis direction, the inner circumferential surface of the outer leg portion 31 of the core 3a is curved along the outer circumferential surface of the coil portion 20.

[0059] When the coil section 20 is housed in the housing section 41A, a gap is formed between the pull-out section 21b and the upper end of the outer leg section 31 of the core 3b. The upper end of the outer leg section 31 of the core 3b functions as a stopper, preventing the pull-out section 21b from rotating. Although not shown in detail, a gap is also formed between the pull-out section 21a and the upper end of the outer leg section 31 of the core 3a. The upper end of the outer leg section 31 of the core 3a functions as a stopper, preventing the pull-out section 21a from rotating.

[0060] As shown in Figure 8, in this embodiment, the housing section 41A has a wall 410A that curves along the outer circumferential surface of the coil section 20. The housing section 41 also has a through hole 414a that penetrates the wall 410A. Therefore, when cooling air is blown toward the coil device 1A, at least a portion of the cooling air flows into the housing section 41A through the through hole 414a. As a result, the cooling air hits at least a portion of the coil section 20, and the cooling efficiency of the coil section 20 can be increased.

[0061] This disclosure is not limited to the embodiments described above, and can be modified in various ways within the scope of this disclosure.

[0062] As shown in Figure 1, in each of the above embodiments, the number of wires 2 (coil section 20) was one, but there may be multiple (for example, two). In this case, the coil device 1 can function as, for example, a transformer. [Explanation of symbols]

[0063] 1.1A... Coil device 2…Wire 20... Volume 2 21a, 21b...Drawer part 3a, 3b... Core 30...Base section 31...Outer leg 32...middle leg 4,4A…Case 41, 41A... Storage area 410, 410A... Wall 410a~410d...1st part~4th part 411... Containment opening 412,412A…Communication path 413... Tsuba (guard) 414a, 414b...Through hole 415... Curved section 416…Side wall 42... Core support section 420...bass 421...Base opening 422a~422d…legs 423... Gap 43... Coil support section

Claims

1. A plate-shaped wire having a coil portion and a lead portion drawn out from the coil portion, A core arranged around the coil portion, The case comprises a housing portion that houses the coil portion along a housing direction perpendicular to the winding axis direction of the coil portion, a core support portion connected to one end of the housing portion in the housing direction and supporting the core, and a coil support portion that supports the outer circumferential surface of the coil portion. The housing portion is a coil device that covers at least a part of the outer surface of the coil portion.

2. The coil device according to claim 1, wherein the housing portion has a communication passage for inserting at least a portion of the core into the housing portion along the winding axis direction.

3. The aforementioned housing section has a cylindrical wall, The coil device according to claim 2, wherein the housing portion has a housing opening for housing the coil portion in the housing portion and a hole-shaped communication passage that penetrates the wall in the winding axis direction.

4. The core support portion has a ring-shaped base and a base opening located inside the base. The core is placed on the base, The coil device according to any one of claims 1 to 3, wherein, when viewed from the aforementioned housing direction, the coil support portion is located inside the base opening.

5. The core support portion has a ring-shaped base and a base opening located inside the base. The core support portion has a plurality of legs that protrude from the base in a direction away from the housing portion, The coil device according to any one of claims 1 to 3, wherein a gap is formed between the plurality of legs.

6. The coil device according to any one of claims 1 to 3, wherein at least a portion of the draw-out portion protrudes from the housing portion along the housing direction.

7. The housing portion has a wall that curves along the outer surface of the coil portion, The coil device according to claim 1 or 2, wherein the housing portion has a through hole penetrating the wall.

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