Coil and magnetic component

Abstract

To provide a coil and a magnetic component that are capable of reducing loss.SOLUTION: A coil includes a conductive member and a first magnetic sheet. The conductive member is wound around a first axis. The conductive member includes a first partial region and a second partial region. A first direction from the first partial region to the second partial region is along the first axis. The first magnetic sheet includes a first sheet region. The first sheet region is provided between the first partial region and the second partial region in the first direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to coils and magnetic components.

Background Art

[0002] For example, a coil including a wound conductive member is used for magnetic components and the like. A reduction in loss is desired in the coil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Embodiments provide a coil and a magnetic component capable of reducing loss.

Means for Solving the Problems

[0005] According to an embodiment, a coil includes a conductive member and a first magnetic sheet. The conductive member is wound around a first axis. The conductive member includes a first partial region and a second partial region. A first direction from the first partial region to the second partial region is along the first axis. The first magnetic sheet includes a first sheet region. The first sheet region is provided between the first partial region and the second partial region in the first direction.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

BEST MODE FOR CARRYING OUT THE INVENTION

[0007] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the sizes between parts, etc. are not necessarily the same as the actual ones. Even when representing the same part, the dimensions and ratios may be represented differently in the drawings. In the present specification and each figure, the same reference numerals are given to the same elements as those described above with respect to the previously shown figures, and the detailed description will be omitted as appropriate.

[0008] (First Embodiment) FIGS. 1(a) to 1(c) are schematic views illustrating the coil according to the first embodiment. FIG. 1(a) is a side view. FIG. 1(b) is a plan view of a part of the coil. FIG. 1(c) is a cross-sectional view illustrating a part of the coil in an enlarged manner. As shown in FIGS. 1(a) to 1(c), the coil 110 according to the embodiment includes a conductive member 10 and a first magnetic sheet 31.

[0009] The conductive member 10 is wound around the first axis Ax1. The conductive member 10 is, for example, a winding. The conductive member 10 may be a conductive wire or a conductive layer. For example, the conductive member 10 is wound in a spiral around the first axis Ax1. As shown in FIG. 1(c), the conductive member 10 includes a plurality of partial regions 10p (for example, a first partial region 11 and a second partial region 12, etc.). These partial regions 10p correspond to a plurality of parts in the spiral conductive member 10 where the winding positions are different. The first direction D1 from the first partial region 11 to the second partial region 12 is along the first axis Ax1.

[0010] The first magnetic sheet 31 includes a first sheet region 31a. The first sheet region 31a is provided between the first partial region 11 and the second partial region 12 in the first direction D1.

[0011] In the coil 110 according to the embodiment, the first sheet region 31a of the first magnetic sheet 31 is provided between the first partial region 11 and the second partial region 12. The first sheet region 31a functions as, for example, a magnetic shield. Thereby, the magnetic interaction between the first partial region 11 and the second partial region 12 is suppressed. For example, the loss based on the proximity effect is suppressed. According to the embodiment, a coil capable of reducing the loss can be provided.

[0012] For example, it is suppressed that the magnetic field caused by the current flowing through the first partial region 11 is applied to the second partial region 12. For example, it is suppressed that the magnetic field caused by the current flowing through the second partial region 12 is applied to the first partial region 11.

[0013] As shown in FIG. 1(c), the conductive member 10 may further include a third partial region 13 and a fourth partial region 14. The third partial region 13 is provided between the first partial region 11 and the second partial region 12. The third partial region 13 is provided between the first partial region 11 and the second partial region 12, for example, in the direction along the winding. The second partial region 12 is provided between the third partial region 13 and the fourth partial region 14. The second partial region 12 is provided between the third partial region 13 and the fourth partial region 14, for example, in the direction along the winding. For example, the current flowing through the conductive member 10 flows from the first partial region 11 to the third partial region 13, from the third partial region 13 to the second partial region 12, and from the second partial region 12 to the fourth partial region 14. Or, the current flowing through the conductive member 10 flows from the fourth partial region 14 to the second partial region 12, from the second partial region 12 to the third partial region 13, and from the third partial region 13 to the first partial region 11.

[0014] The direction from the third partial region 13 to the fourth partial region 14 is along the first direction D1. The first magnetic sheet 31 may further include a second sheet region 31b. The second sheet region 31b is provided between the third partial region 13 and the fourth partial region 14. The second sheet region 31b functions as, for example, a magnetic shield. Thereby, the magnetic interaction between the third partial region 13 and the fourth partial region 14 is suppressed, and losses can be reduced.

[0015] For example, the direction from the third partial region 13 to the first partial region 11 intersects the first direction D1.

[0016] Let the first direction D1 be the Z-axis direction. Let one direction perpendicular to the Z-axis direction be the X-axis direction. Let the direction perpendicular to the Z-axis direction and the X-axis direction be the Y-axis direction.

[0017] In this example, the first magnetic sheet 31 has a flat shape. A part of the first magnetic sheet 31 does not overlap with another part of the first magnetic sheet 31 in the first direction D1. In this example, the first magnetic sheet 31 is planar along the X-Y plane. As will be described later, the shape of the first magnetic sheet 31 can be variously deformed.

[0018] FIG. 1(b) illustrates the planar shape of the first magnetic sheet 31. The first magnetic sheet 31 may be, for example, arc-shaped about the first axis Ax1. The arc is, for example, an annular shape with a part interrupted. The width of the arc has a length equal to or greater than the width of the conductive member 10. The planar shape of the first magnetic sheet 31 may be a shape corresponding to the shape of the conductive member 10. The shape of the first magnetic sheet 31 may be, for example, a shape in which a polygonal ring is interrupted. In a plan view along the first direction D1, the conductive member 10 is located between the outer edge and the inner edge of the first magnetic sheet 31.

[0019] As shown in FIG. 1(b), the first magnetic sheet 31 does not have to be annular. The first magnetic sheet 31 includes a first end 31e and a first other end 31f. A gap is provided between the first end 31e and the first other end 31f. A part of the conductive member 10 may pass through the gap.

[0020] As shown in FIG. 1(c), the conductive member 10 further includes a first intermediate region 11M between the second partial region 12 and the third partial region 13. The first intermediate region 11M is provided between the first end 31e and the first other end 31f. The first magnetic sheet 31 may be provided so as to sandwich the first intermediate region 11M. The function of the first magnetic sheet 31 as a magnetic shield is effectively exerted.

[0021] In the example of FIG. 1(c), the direction from the second sheet region 31b to the first sheet region 31a is substantially perpendicular to the first direction D1. The angle between the direction from the second sheet region 31b to the first sheet region 31a and the first direction D1 may be, for example, 82 degrees or more and 98 degrees or less.

[0022] In the example of FIG. 1(c), the direction from the third partial region 13 to the second partial region 12 is inclined with respect to the first direction D1. For example, the direction along the third partial region 13 is inclined with respect to the direction along the first intermediate region 11M. The direction along the third partial region 13 is substantially parallel to the direction along the second partial region 12.

[0023] As shown in FIG. 1(a), the conductive member 10 includes a plurality of partial regions 10p. The first partial region 11, the second partial region 12, the third partial region 13, the fourth partial region 14, the first intermediate region 11M, etc. are included in the plurality of partial regions 10p.

[0024] A plurality of first magnetic sheets 31 may be provided. In an embodiment, the partial region 10p and the first magnetic sheet 31 may be alternately provided in the first direction D1.

[0025] In the example of FIG. 1(a), in the first direction D1, two or more of the plurality of partial regions 10p are provided between one of the plurality of first magnetic sheets 31 and another one of the plurality of first magnetic sheets 31. Two or more of the plurality of partial regions 10p include, for example, one of the plurality of partial regions 10p and another one of the plurality of partial regions 10p. The direction from one of the plurality of partial regions 10p to another one of the plurality of partial regions 10p is along the first direction D1.

[0026] For example, the first partial region 11 may be included in one of the plurality of partial regions 10p. The second partial region 12 may be included in another one of the plurality of partial regions 10p. The magnetic interaction between one of the plurality of partial regions 10p and another one of the plurality of partial regions 10p is suppressed. For example, the loss based on the proximity effect is suppressed. According to the embodiment, a coil capable of reducing the loss can be provided.

[0027] FIG. 2 is a graph illustrating the characteristics of the coil. FIG. 2 illustrates the characteristics in a plurality of configurations (first configuration CF1, second configuration CF2, third configuration CF3, and fourth configuration CF4) related to the coil. In the first configuration CF1, the first magnetic sheet 31 is not provided. In the second configuration CF2, one first magnetic sheet 31 is provided every eight turns of the conductive member 10. In the third configuration CF3, one first magnetic sheet 31 is provided every four turns of the conductive member 10. In the fourth configuration CF4, one first magnetic sheet 31 is provided every one turn of the conductive member 10. The horizontal axis in FIG. 2 is the frequency f1. The vertical axis is the AC resistance R1 of the coil.

[0028] As shown in FIG. 2, the AC resistance R1 in the second configuration CF2, the third configuration CF3, and the fourth configuration CF4 is lower than the AC resistance R1 in the first configuration CF1. By providing the first magnetic sheet 31, the loss can be reduced. Since the first magnetic sheet 31 has a gap, the first magnetic sheet 31 can be inserted at a desired position of the coil for each desired number of turns. When the insertion frequency of the first magnetic sheet 31 is high, a low AC resistance R1 can be obtained. The frequency may be determined according to the target loss, production efficiency, etc.

[0029] A part of the conductive member 10 overlaps with another part of the conductive member 10 in the first direction D1. The conductive member 10 has a configuration of two or more layers overlapping in the first direction D1. Each of the plurality of layers of the conductive member 10 may be wound multiple times. The conductive member 10 may include, for example, an edgewise coil. The conductive member 10 may have a configuration in which, for example, a flat metal wire is wound once in one layer. The thickness of the flat metal wire is the length of the flat metal wire along the first direction D1. The width of the flat metal wire is the length of the flat metal wire along a direction orthogonal to the winding direction of the flat metal wire and orthogonal to the first direction D1. For example, the width of the flat metal wire is larger than the thickness of the flat metal wire. In a plan view along the first direction D1, the conductive member 10 may be wound in a substantially polygonal shape or a circular shape.

[0030] FIG. 3 is a schematic cross-sectional view illustrating a coil according to the first embodiment. As shown in FIG. 3, the coil 111 according to the embodiment also includes a conductive member 10 and a first magnetic sheet 31. In the coil 111, the cross-sectional shapes of the conductive member 10 and the first magnetic sheet 31 are different from those in the coil 110. The configuration of the coil 111 except for this may be the same as the configuration of the coil 110.

[0031] In the coil 111, the direction from the second sheet region 31b to the first sheet region 31a is inclined with respect to the first direction D1. The direction along the third partial region 13 is substantially parallel to the direction along the first intermediate region 11M. The direction along the first intermediate region 11M is substantially parallel to the direction along the second partial region 12. Thus, in the embodiment, the cross-sectional shape can be variously deformed.

[0032] In the embodiment, the conductive member 10 includes, for example, at least one selected from the group consisting of Cu, Al, Ag, and Au. The first magnetic sheet 31 includes, for example, at least one selected from the group consisting of Fe, Co, Ni, and Mn. For example, the first magnetic sheet 31 may include ferrite.

[0033] FIG. 4 is a schematic cross-sectional view illustrating a part of the coil according to the first embodiment. As shown in FIG. 4, the coil 112 according to the embodiment further includes an insulating member 10i. At least a part of the insulating member 10i is provided between the first partial region 11 and the first sheet region 31a. The insulating member 10i may be provided between one of the plurality of partial regions 10p and another one of the plurality of partial regions 10p.

[0034] As shown in FIG. 4, the thickness t31 of the first magnetic sheet 31 along the first direction D1 may be thinner than the thickness t11 of the first partial region 11 along the first direction D1. By having a large thickness t11, for example, it is easy to obtain a low electrical resistance.

[0035] In one example, the thickness t31 of the first magnetic sheet 31 along the first direction D1 is 10 μm or more and 100 μm or less. In one example, the thickness t11 of the first partial region 11 along the first direction D1 is 50 μm or more and 200 μm or less.

[0036] The thickness t10i of the insulating member 10i along the first direction D1 is, for example, 20 μm or more and 100 μm or less. The insulating member 10i may include, for example, a resin (such as polyimide, vinyl chloride, or polyethylene). The insulating member 10i may include, for example, a paint (such as enamel or polyurethane).

[0037] FIGS. 5(a) and 5(b) are schematic diagrams illustrating the coil according to the first embodiment. FIG. 5(a) is a cross-sectional view. FIG. 5(b) is a plan view of a part of the coil. As shown in FIG. 5(a), the coil 113 according to the embodiment further includes a first magnetic member 41 in addition to the conductive member 10 and the first magnetic sheet 31. The configuration of the coil 113 excluding this may be the same as the configuration of the coil 110, the coil 111, or the coil 112.

[0038] FIG. 5(b) illustrates the planar shape of the first magnetic member 41. The first magnetic member 41 is, for example, cylindrical about the first axis Ax1. The conductive member 10 is wound around the first magnetic member 41 in a first plane intersecting the first axis Ax1. The first plane is, for example, the X-Y plane. The first magnetic sheet 31 is provided around the first magnetic member 41 in the first plane (X-Y plane).

[0039] For example, as illustrated in FIG. 5(a), the influence of the fringing magnetic flux between the first core 51 (magnetic core) and the second core 52 (magnetic core) is suppressed. Losses are suppressed.

[0040] The first magnetic member 41 may include, for example, at least one selected from the group consisting of Fe, Co, Ni, and Mn.

[0041] (Second Embodiment) The second embodiment relates to a magnetic component. The magnetic component 210 (see FIG. 5(a)) according to the second embodiment includes a coil (such as coils 110 to 113) according to the first embodiment and a core (such as the first core 51 or the second core 52). The conductive member 10 is wound around the core. The first magnetic sheet 31 is provided around the core. In the magnetic component 210 according to the embodiment, losses are suppressed and high efficiency is obtained.

[0042] The embodiment may include, for example, the following technical solutions. (Technical Solution 1) A conductive member wound around a first axis, the conductive member including a first partial region and a second partial region, wherein a first direction from the first partial region to the second partial region is along the first axis, the conductive member, a first magnetic sheet including a first sheet region provided between the first partial region and the second partial region in the first direction, and a coil.

[0043] (Technical Solution 2) The conductive member further includes a third partial region and a fourth partial region, The third partial area is between the first partial area and the second partial area, The second partial area is between the third partial area and the fourth partial area, The direction from the third partial area to the fourth partial area is along the first direction, The first magnetic sheet further includes a second sheet area, The second sheet area is the coil described in Technical Solution 1 provided between the third partial area and the fourth partial area.

[0044] (Technical Solution 3) The direction from the third partial area to the first partial area is the coil described in Technical Solution 2 that intersects the first direction.

[0045] (Technical Solution 4) The first magnetic sheet includes a first end and a first other end, The conductive member further includes a first intermediate area between the second partial area and the third partial area, The first intermediate area is the coil described in Technical Solution 2 or 3 provided between the first end and the first other end.

[0046] (Technical Solution 5) The direction from the second sheet area to the first sheet area is substantially perpendicular to the first direction, which is the coil described in any one of Technical Solutions 2 to 4.

[0047] (Technical Solution 6) The direction from the third partial area to the second partial area is inclined with respect to the first direction, which is the coil described in Technical Solution 5.

[0048] (Technical Solution 7) The direction along the third partial area is inclined with respect to the direction along the first intermediate area, The direction along the third partial area is substantially parallel to the direction along the second partial area, which is the coil described in Technical Solution 4.

[0049] (Technical Solution 8) The direction from the second sheet region to the first sheet region is inclined with respect to the first direction, and the coil according to any one of Technical Solutions 2 to 4.

[0050] (Technical Solution 9) The direction along the third partial region is substantially parallel to the direction along the first intermediate region, The direction along the first intermediate region is substantially parallel to the direction along the second partial region, and the coil according to Technical Solution 4.

[0051] (Technical Solution 10) The first magnetic sheet is arc-shaped with the first axis as the center, and the coil according to any one of Technical Solutions 1 to 9.

[0052] (Technical Solution 11) Further including a first magnetic member, The first magnetic member is cylindrical with the first axis as the center, The conductive member is wound around the first magnetic member in a first plane intersecting the first axis, The first magnetic sheet is provided around the first magnetic member in the first plane, and the coil according to any one of Technical Solutions 1 to 10.

[0053] (Technical Solution 12) The first magnetic member includes at least one selected from the group consisting of Fe, Co, Ni, and Mn, and the coil according to Technical Solution 11.

[0054] (Technical Solution 13) The conductive member includes a plurality of partial regions, A plurality of the first magnetic sheets are provided, The partial regions and the first magnetic sheets are alternately provided in the first direction, and the coil according to any one of Technical Solutions 1 to 12.

[0055] (Technical Solution 14) The conductive member includes a plurality of partial regions, A plurality of the first magnetic sheets are provided, In the first direction, one of the plurality of first magnetic sheets and another one of the plurality of first magnetic sheets are provided with one of the plurality of sub-regions and another one of the plurality of sub-regions therebetween. The direction from the one of the plurality of sub-regions to the another one of the plurality of sub-regions is along the first direction, the coil according to any one of Technical Solutions 1 to 13.

[0056] (Technical Solution 15) The conductive member includes at least one selected from the group consisting of Cu, Al, Ag, and Au. The first magnetic sheet includes at least one selected from the group consisting of Fe, Co, Ni, and Mn, the coil according to any one of Technical Solutions 1 to 14.

[0057] (Technical Solution 16) The first magnetic sheet includes ferrite, the coil according to any one of Technical Solutions 1 to 14.

[0058] (Technical Solution 17) The thickness of the first magnetic sheet along the first direction is thinner than the thickness of the first sub-region along the first direction, the coil according to any one of Technical Solutions 1 to 16.

[0059] (Technical Solution 18) The thickness of the first magnetic sheet along the first direction is 10 μm or more and 100 μm or less. The thickness of the first sub-region along the first direction is 50 μm or more and 200 μm or less, the coil according to any one of Technical Solutions 1 to 16.

[0060] (Technical Solution 19) Further comprising an insulating member. At least a part of the insulating member is provided between the first sub-region and the first sheet region, the coil according to any one of Technical Solutions 1 to 18.

[0061] (Technical Solution 20) The coil according to any one of Technical Solutions 1 to 19, and a core and comprises the conductive member is wound around the core, the first magnetic sheet is a magnetic component provided around the core.

[0062] According to the embodiment, a coil and a magnetic component capable of reducing losses can be provided.

[0063] As described above, the embodiments of the present invention have been described with reference to specific examples. However, the present invention is not limited to these specific examples. For example, with regard to the specific configurations of each element such as the conductive member and the magnetic sheet included in the coil and the magnetic component, the present invention can be similarly implemented by appropriately selecting from the range known to those skilled in the art, and as long as the same effects can be obtained, it is included in the scope of the present invention.

[0064] In addition, combinations of any two or more elements of each specific example within a technically possible range are also included in the scope of the present invention as long as they include the gist of the present invention.

[0065] Furthermore, all coils and magnetic components that can be appropriately designed and modified by those skilled in the art based on the coils and magnetic components described above as embodiments of the present invention also belong to the scope of the present invention as long as they include the gist of the present invention.

[0066] In addition, within the scope of the idea of the present invention, those skilled in the art can conceive of various modification examples and correction examples, and it is understood that those modification examples and correction examples also belong to the scope of the present invention.

[0067] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and its equivalent scope.

Description of Symbols

[0068] 10: Conductive member, 10i: Insulating member, 10p: Partial region, 11 - 14: First - fourth partial regions, 11M: First intermediate region, 31: First magnetic sheet, 31a, 31b: First, second sheet regions, 31e: First end, 31f: First other end, 41: First magnetic member 51, 52: First, second cores, 110 - 113: Coils, 210: Magnetic component, Ax1: First axis, CF1 - CF4: First - fourth configurations, D1: First direction, R1: AC resistance, f1: Frequency, t10i, t11, t31: Thickness

Claims

1. A conductive member wound around a first axis, the conductive member including a first partial region and a second partial region, a first direction from the first partial region to the second partial region being along the first axis, the conductive member, a first magnetic sheet including a first sheet region provided between the first partial region and the second partial region in the first direction, A coil comprising:

2. The conductive member further includes a third partial region and a fourth partial region, The third partial region is between the first partial region and the second partial region, The second partial region is between the third partial region and the fourth partial region, A direction from the third partial region to the fourth partial region is along the first direction, The first magnetic sheet further includes a second sheet region, The second sheet region is provided between the third partial region and the fourth partial region, the coil according to claim 1.

3. The direction from the third partial region to the first partial region intersects the first direction, the coil according to claim 2.

4. The first magnetic sheet includes a first end and a first other end, The conductive member further includes a first intermediate region between the second partial region and the third partial region, The first intermediate region is provided between the first end and the first other end, the coil according to claim 2.

5. A direction from the second sheet region to the first sheet region is substantially perpendicular to the first direction, the coil according to any one of claims 2 to 4.

6. A direction from the third partial region to the second partial region is inclined with respect to the first direction, the coil according to claim 5.

7. Further including a first magnetic member, The first magnetic member is cylindrical with the first axis as the center, The conductive member is wound around the first magnetic member in a first plane intersecting the first axis, The first magnetic sheet is provided around the first magnetic member in the first plane, the coil according to claim 1.

8. The conductive member includes a plurality of partial regions, A plurality of the first magnetic sheets are provided, The partial regions and the first magnetic sheets are alternately provided in the first direction, the coil according to claim 1.

9. The conductive member includes a plurality of partial regions, A plurality of the first magnetic sheets are provided, In the first direction, one of the plurality of first magnetic sheets and another one of the plurality of first magnetic sheets are provided with one of the plurality of sub-regions and another one of the plurality of sub-regions therebetween. The direction from the one of the plurality of sub-regions to the another one of the plurality of sub-regions is along the first direction. The coil according to claim 1. **Claim 10** The coil according to claim 1, a core, comprising: The conductive member is wound around the core. The first magnetic sheet is a magnetic component provided around the core.

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