Magnetic coupling type reactor

Abstract

To provide a magnetic coupling type reactor capable of reducing loss.SOLUTION: A magnetic coupling type reactor comprises a core which has a first leg part and a second leg part extending in a first direction respectively and facing each other in a second direction orthogonal to the first direction, and a first coil and a second coil which are wound around the first leg part and second leg part so that directions of magnetic flux generated thereby differ from each other, and also includes a multilayer structure in which the first coil and the second coil are divided at least in the first direction in cross-sectional view along the first direction and the second direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a magnetically coupled reactor. [Background technology]

[0002] Conventionally, a magnetically coupled reactor has been known in which magnetic coupling is achieved by arranging coils so as to cancel out generated magnetic flux. For example, a magnetically coupled reactor disclosed in Patent Document 1 includes a reactor core that forms a closed magnetic circuit, a first coil portion wound around the reactor core in a divided manner, and a second coil portion wound around the reactor core in a divided manner at a position separated from the first coil portion in a first direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-10332 Summary of the Invention [Problem to be solved by the invention]

[0004] In a magnetically coupled reactor, a portion of the magnetic flux that is not canceled out becomes leakage flux. When this leakage flux interlinks with a conductor such as a coil winding, eddy currents are generated within the conductor. The generation of eddy currents within the conductor can cause induction heating, resulting in increased losses.

[0005] An aspect of the present disclosure aims to provide a magnetically coupled reactor that can reduce losses. [Means for solving the problem]

[0006] A magnetically coupled reactor according to one embodiment of the present disclosure includes a core having a first leg and a second leg that each extend in a first direction and face each other in a second direction perpendicular to the first direction, and a first coil and a second coil that are wound around the first leg and the second leg so that the directions of the magnetic flux generated by each coil are different, and when viewed in a cross section along the first direction and the second direction, each of the first coil and the second coil includes a multi-layer structure that is divided at least in the first direction. [Effects of the Invention]

[0007] According to an aspect of the present disclosure, a magnetically coupled reactor capable of reducing loss can be provided. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a magnetic coupling reactor according to a first embodiment. [Figure 2] 1A and 1B are cross-sectional views taken along a first direction and a second direction of a magnetic coupling reactor according to a first embodiment. [Figure 3] FIG. 3 is an enlarged cross-sectional view of part III in FIG. 2. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a portion IV in FIG. 3. [Figure 5] FIG. 10 is an enlarged cross-sectional view of a portion of a magnetic coupling reactor according to a second embodiment. [Figure 6] FIG. 6 is an enlarged cross-sectional view of a portion VI in FIG. 5. [Figure 7] FIG. 10 is an enlarged cross-sectional view of a portion of a magnetic coupling reactor according to a third embodiment. [Figure 8] FIG. 10 is a cross-sectional view illustrating leakage magnetic flux of a magnetic coupling reactor according to a comparative example. [Figure 9] FIG. 10 is a cross-sectional view illustrating leakage magnetic flux of a magnetic coupling reactor according to a third embodiment. [Figure 10] FIG. 10 is an enlarged cross-sectional view of a portion of a magnetic coupling reactor according to a fourth embodiment. [Figure 11]FIG. 10 is an enlarged cross-sectional view of a portion of a magnetic coupling reactor according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the present embodiment, an example in which a split winding type winding structure is adopted as a magnetically coupled reactor will be described.

[0010] In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," do not only mean such arrangements or states in the strict sense, but also include arrangements or states in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. In the drawings used in the following description, the scale of each component may be changed as appropriate to make each component recognizable.

[0011] First Embodiment Fig. 1 is a perspective view showing a magnetically coupled reactor 1 according to the first embodiment. In Fig. 1, the phases of the multi-phase magnetically coupled reactor 1 are indicated as A+ phase, A- phase, B+ phase, and B- phase. 1, the magnetically coupled reactor 1 includes a core 2 having first and second legs 21 and 22 that extend in a first direction and face each other in a second direction perpendicular to the first direction, and first coils 3A1 and 3A2 and second coils 3B1 and 3B2 that are wound around the first and second legs 21 and 22 so that the directions of the magnetic fluxes generated by the first and second coils are different from each other. Spaces 9 are formed between the first and second legs 21 and 22 and between the first and second coils 3A1 and 3A2 and the second coils 3B1 and 3B2.

[0012] In the following explanation, an X, Y, Z Cartesian coordinate system will be used as necessary. The X direction corresponds to the first direction (the direction in which the first leg 21 and the second leg 22 extend). The Y direction corresponds to the second direction (the direction in which the first leg 21 and the second leg 22 face each other). The Z direction corresponds to the third direction that is perpendicular to the first direction (X direction) and the second direction (Y direction). In the following explanation, the arrow side of the X direction, Y direction, and Z direction in the figure will be referred to as the plus (+) side, and the side opposite the arrow will be referred to as the minus (-) side. The +X side corresponds to one side of the first direction, and the -X side corresponds to the other side of the second direction.

[0013] <Core> The core 2 is formed, for example, of a ferrite core or a laminated core made of laminated silicon steel. However, the core 2 is not limited to the above, and may be formed of a magnetic material such as a powder magnetic core, a ferrite core, a metal composite core, or a laminated steel plate. The configuration of the core 2 can be changed according to the design specifications.

[0014] The core 2 is formed in a rectangular ring shape when viewed from the Z direction. The core 2 includes a pair of yoke portions 23, 24 that each extend in the second direction and face each other in the first direction. The pair of yoke portions 23, 24 are provided so as to bridge both ends in the first direction of each of the first leg portion 21 and the second leg portion 22 in the second direction. Each of the first leg portion 21 and the second leg portion 22 extends in the first direction between the pair of yoke portions 23, 24.

[0015] Each of the first leg portion 21 and the second leg portion 22 is formed in a rectangular parallelepiped shape having a longitudinal axis in the first direction. Each of the pair of yoke portions 23, 24 is formed in a rectangular parallelepiped shape having a longitudinal axis in the second direction. For example, the first leg portion 21 and the second leg portion 22 may be formed in the same shape as each other. For example, the pair of yoke portions 23, 24 may be formed in the same shape as each other. For example, each of the first leg portion 21 and the second leg portion 22 may have a shorter length in the Z direction than each of the pair of yoke portions 23, 24. For example, the first leg portion 21 and the second leg portion 22 may be disposed inward in the Z direction with respect to the Z direction outer surfaces of the pair of yoke portions 23, 24. For example, the first leg portion 21 and the second leg portion 22 may be disposed inward in the Y direction with respect to the Y direction outer surfaces of the pair of yoke portions 23, 24, or may be disposed so that their Y direction outer surfaces are on the same plane. The shape of the core 2 is not limited to the above and can be changed according to design specifications.

[0016] <Coil> In this embodiment, each of the first coils 3A1, 3A2 is made of a split rectangular wire formed by unifying multiple conductive wires. The first coils 3A1, 3A2 are split and wound around the first leg 21 and the second leg 22. The first coils 3A1, 3A2 are wound around the -X side portions of the first leg 21 and the second leg 22, respectively. The first coils 3A1, 3A2 correspond to the A+ phase and the A- phase, respectively.

[0017] For example, the first coils 3A1 and 3A2 may be formed of a single conductor 30A. For example, the first coil 3A1 may be formed by winding a single conductor 30A around the outer periphery of the -X side portion of the first leg 21. For example, the first coil 3A2 may be formed by winding the same conductor 30A as the first coil 3A1 around the outer periphery of the -X side portion of the second leg 22. The coils 3A1 and 3A2 may be formed with a winding start end 31A and a winding end 32A of the single conductor 30A. The winding start end 31A and the winding end end 32A may be formed to face the -X side on the +Z side of the coils 3A1 and 3A2.

[0018] In this embodiment, each of the second coils 3B1, 3B2 is formed by a split rectangular wire formed by unifying multiple conductive wires. The second coils 3B1, 3B2 are wound around the first leg 21 and the second leg 22 at positions spaced apart from the first coils 3A1, 3A2 in the first direction. The second coils 3B1, 3B2 are wound around the +X side portions of the first leg 21 and the second leg 22, respectively, so as to be aligned with the first coils 3A1, 3A2 in the first direction with a space 9 between them. The second coils 3B1, 3B2 correspond to the B+ phase and the B- phase, respectively.

[0019] For example, the second coils 3B1 and 3B2 may be formed of a single conductor 30B. For example, the second coil 3B1 may be formed by winding a single conductor 30B around the outer periphery of the +X side portion of the first leg 21. For example, the second coil 3B2 may be formed by winding the same conductor 30B as the second coil 3B1 around the outer periphery of the +X side portion of the second leg 22. The coils 3B1 and 3B2 may be formed with a winding start end 31B and a winding end 32B of the single conductor 30B. The winding start end 31B and the winding end end 32B may be formed to face the +X side on the +Z side of the coils 3B1 and 3B2.

[0020] Fig. 2 is a cross-sectional view of the magnetic coupling reactor 1 according to the first embodiment taken along the first and second directions. Fig. 2 corresponds to a cross-sectional view of the magnetic coupling reactor 1 cut along an XY plane passing through the center of the magnetic coupling reactor 1 in the Z direction. In Fig. 2, the magnetic flux routes of the magnetic coupling reactor are indicated by MF, MF1, and MF2. MF in Fig. 2 is expressed by the following equation (1):

[0021] MF=MF1+MF2...Formula (1)

[0022] The degree of coupling of a magnetically coupled reactor is defined as MF1 / MF in Figure 2. The degree of coupling refers to the degree to which the magnetic flux of phase A is transmitted to phase B. MF2 in Figure 2 corresponds to leakage flux, and the degree of coupling is adjusted by adjusting the ease of leakage due to the core shape and coil opening dimensions. MF1 in Figure 2 has the function of canceling out the DC magnetic flux of other phases, while MF2, as leakage flux, does not contribute to canceling out the DC magnetic flux.

[0023] Fig. 3 is an enlarged cross-sectional view of part III in Fig. 2. Fig. 3 shows an example of leakage flux linking the winding. Fig. 4 is an enlarged cross-sectional view of part IV in Fig. 3. Fig. 4 shows an example of the cross-sectional dimensions of the winding. 3 and 4, in a cross section along the first direction and the second direction (XY cross section), each of the coils 3A1 to 3B2 includes a multilayer structure 35 divided at least in the first direction.

[0024] In an XY cross-sectional view, the multilayer structure 35 is divided in the X direction. In the example of Fig. 4, the multilayer structure 35 has an outer shape of 3 mm in the X direction and 6 mm in the Y direction, and is divided into three sections of 1 mm each in the X direction. In the example of Fig. 4, the outer shape of the sections 36 divided in the X direction is formed so that the ratio of X-direction dimension to Y-direction dimension is 1:6. For example, one winding constituting each of the first coils 3A1, 3A2 and the second coils 3B1, 3B2 may be composed of a divided rectangular wire in which multiple conductors are unified in the X direction.

[0025] In this embodiment, by dividing the multilayer structure 35 in the X direction perpendicular to the flux linkage, even if leakage flux having an AC component links to part of the winding, the induction heating (heat generation) of the linked part (the part hit by the arrow in Figure 3) can be reduced according to the number of divisions. Generally, eddy current loss is proportional to the square of the thickness perpendicular to the flux linkage, so when the multilayer structure 35 is divided into three in the X direction, the induction heating per part is 1 / 9, and even when all three are combined, it is 1 / 3 of the original.

[0026] The multilayer structure 35 is not limited to the above, and may be divided into two in the X direction, or into four or more. The configuration of the multilayer structure 35 (number of divisions, shape, dimensions, etc.) can be changed according to design specifications.

[0027] <Action and effect> As described above, the magnetically coupled reactor 1 of this embodiment includes the core 2 having the first leg 21 and the second leg 22 that extend in a first direction and face each other in a second direction orthogonal to the first direction, and the first coils 3A1, 3A2 and the second coils 3B1, 3B2 that are wound around the first leg 21 and the second leg 22 so that the directions of the magnetic flux generated by the first coils 3A1, 3A2 and the second coils 3B1, 3B2 are different from each other. In cross-sectional views along the first and second directions, each of the first coils 3A1, 3A2 and the second coils 3B1, 3B2 includes a multi-layer structure 35 that is divided at least in the first direction. For example, when leakage flux interlinks with a conductor such as a coil winding, eddy currents are generated within the conductor, which can cause induction heating and increase losses. In contrast, according to this embodiment, each of the first coils 3A1, 3A2 and the second coils 3B1, 3B2 includes a multi-layer structure 35 divided at least in the first direction. Therefore, even if leakage magnetic flux interlinks with the first coils 3A1, 3A2 and / or the second coils 3B1, 3B2, induction heating (heat generation) of the interlinked portions can be reduced according to the number of divisions. Therefore, loss (AC loss) can be reduced. This not only improves efficiency, but also extends the heat-resistant life of components and contributes to miniaturization by simplifying the cooling function.

[0028] In this embodiment, each of the first coils 3A1, 3A2 and the second coils 3B1, 3B2 is made of a divided rectangular wire formed by combining a plurality of conducting wires into one. According to this embodiment, the space factor can be increased compared to when the first coils 3A1, 3A2 and the second coils 3B1, 3B2 are each made of Litz wire, which contributes to further reduction in DC loss and size reduction.

[0029] In this embodiment, the first coils 3A1 and 3A2 are wound around the first leg 21 and the second leg 22. The second coils 3B1 and 3B2 are wound around the first leg 21 and the second leg 22 at positions spaced apart from the first coils 3A1 and 3A2 in the first direction. According to this embodiment, it is possible to reduce losses in the magnetically coupled reactor 1 of the split winding type.

[0030] Second Embodiment FIG. 5 is an enlarged cross-sectional view of a portion of the magnetically coupled reactor according to the second embodiment. FIG. 5 is a view corresponding to the above-mentioned FIG. 3, and shows an example of leakage magnetic flux linking the windings. FIG. 6 is an enlarged cross-sectional view of part VI in FIG. 5. FIG. 6 is a view corresponding to the above-mentioned FIG. 4, and shows an example of the cross-sectional dimensions of the windings. Hereinafter, the magnetically coupled reactor according to the second embodiment will be described with reference to both FIG. 5 and FIG. 6. In the configuration shown in FIG. 5 and FIG. 6, the same components as those in the above-mentioned embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0031] In the XY cross-sectional view, the multilayer structure 235 is divided in each of the X and Y directions. In the example of Fig. 6, the multilayer structure 235 is formed to have an outer shape of 3 mm in the X direction and 6 mm in the Y direction, and is divided into three sections of 1 mm each in the X direction and six sections of 1 mm each in the Y direction (a total of 18 sections). In the example of Fig. 6, the outer shapes of the divided sections 236 in each of the X and Y directions are formed so that the ratio of the X-direction dimension to the Y-direction dimension is 1:1. For example, one winding constituting each of the first coils 3A1, 3A2 and the second coils 3B1, 3B2 may be composed of a divided rectangular wire in which multiple conductors are unified in each of the X and Y directions.

[0032] In this embodiment, since the multilayer structure 235 is divided into the X direction and the Y direction, even when leakage magnetic flux interlinks with a part of the winding (when magnetic flux interlinks in a direction other than only the X and Y direction components, for example, when magnetic flux interlinks in an oblique direction proceeding 45 degrees from the X direction in the Y direction), induction heating (heat generation) in the interlinked part (the part where the two arrows in FIG. 5 intersect) can be reduced according to the number of divisions.

[0033] The multilayer structure 235 is not limited to the above, and may be divided into two in the X direction and five or less in the Y direction, or may be divided into four or more in the X direction and seven or more in the Y direction. The configuration of the multilayer structure 235 (number of divisions, shape, dimensions, etc.) can be changed according to design specifications.

[0034] In this embodiment, the multilayer structure 235 is divided in each of the first and second directions in a cross-sectional view. According to this embodiment, even if leakage magnetic flux interlinks with the first coils 3A1, 3A2 and / or the second coils 3B1, 3B2, the induction heating (heat generation) of the interlinked portions can be reduced according to the number of divisions, thereby more effectively reducing losses.

[0035] <Third embodiment> Fig. 7 is an enlarged cross-sectional view of a portion of the magnetically coupled reactor according to the third embodiment. Fig. 7 corresponds to a cross-sectional view of the magnetically coupled reactor cut along an XY plane passing through the center of the magnetically coupled reactor in the Z direction. Hereinafter, the magnetically coupled reactor according to the third embodiment will be described with reference to Fig. 7. In the configuration shown in Fig. 7, the same components as those in the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

[0036] In this embodiment, magnetic bodies 304 are further provided in spaces 9 formed between first leg 21 and second leg 22 and between first coils 3A1, 3A2 and second coils 3B1, 3B2, at positions spaced apart from first leg 21, second leg 22, first coils 3A1, 3A2, and second coils 3B1, 3B2. In an XY cross-sectional view, space 9 is formed in a space 9X between end faces of first coils 3A1, 3A2 facing second coils 3B1, 3B2 and end faces of second coils 3B1, 3B2 facing first coils 3A1, 3A2 in the X direction, and in a space 9Y between end faces of first leg 21 facing second leg 22 and end faces of second leg 22 facing first leg 21 in the Y direction.

[0037] The magnetic body 304 is formed, for example, from a ferrite core 2 or a laminated core made of laminated silicon steel. In the example of FIG. 7, the magnetic body 304 is formed by laminating a plurality of steel plates in the X direction. The magnetic body 304 is not limited to the above, and may be formed from a magnetic body such as a powder magnetic core, a ferrite core, a metal composite core, or a laminated steel plate. For example, the magnetic body 304 may be formed from the same material as the core 2 described above. The configuration of the magnetic body 304 can be changed according to design specifications.

[0038] In this embodiment, the magnetic body 304 is disposed at the center of the space 9 in both the first and second directions. In an XY cross-sectional view, the magnetic body 304 is formed into a rectangular cross-sectional shape having a longitudinal axis in the X direction. In an XY cross-sectional view, the magnetic body 304 may be spaced apart from each of the coils 3A1 to 3B2 at equal intervals in the X direction. In an XY cross-sectional view, the magnetic body 304 may be spaced apart from each of the legs 21, 22 at equal intervals in the Y direction. The arrangement and / or shape of the magnetic body 304 are not limited to those described above and can be changed according to design specifications.

[0039] Fig. 8 is a cross-sectional view illustrating leakage magnetic flux of a magnetic coupling reactor according to a comparative example. Fig. 9 is a cross-sectional view illustrating leakage magnetic flux of a magnetic coupling reactor according to a third embodiment. As shown in Fig. 8, the magnetically coupled reactor according to the comparative example does not have a magnetic body in the space. In the comparative example, leakage magnetic flux interlinks with conductors such as coil windings, causing eddy currents to occur within the conductors. The generation of eddy currents within the conductors can cause induction heating, which can increase losses.

[0040] 7 and 9, the magnetic coupling reactor of this embodiment includes a magnetic body 304 in the space 9. In this embodiment, the leakage magnetic flux is attracted to the magnetic body 304. Therefore, it is possible to suppress the magnetic flux linkage to each of the first coils 3A1 and 3A2 and the second coils 3B1 and 3B2.

[0041] In this embodiment, a magnetic body 304 is provided in the space 9 at a position spaced apart from the first leg 21, the second leg 22, the first coils 3A1 and 3A2, and the second coils 3B1 and 3B2. According to this embodiment, the leakage magnetic flux is attracted to the magnetic body 304, so that it is possible to suppress the magnetic flux linkage to the first coils 3A1, 3A2 and / or the second coils 3B1, 3B2, and therefore it is possible to more effectively reduce losses.

[0042] In this embodiment, the magnetic body 304 is disposed in the center of the space 9 in both the first and second directions. According to this embodiment, the leakage magnetic flux is attracted to the center of the space 9 (magnetic body 304), so that the magnetic flux linkage to the first coils 3A1 and 3A2 and / or the second coils 3B1 and 3B2 can be more effectively suppressed, which contributes to further loss reduction.

[0043] <Fourth embodiment> Fig. 10 is an enlarged cross-sectional view of a portion of the magnetically coupled reactor according to the fourth embodiment. Fig. 10 corresponds to a cross-sectional view of the magnetically coupled reactor cut along an XY plane passing through the center of the magnetically coupled reactor in the Z direction. Hereinafter, the magnetically coupled reactor according to the fourth embodiment will be described with reference to Fig. 10. In the configuration shown in Fig. 10, the same components as those in the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

[0044] In this embodiment, a plurality of magnetic bodies 404 are provided. Each of the plurality (four in this embodiment) of magnetic bodies 404 is disposed closer to each of the first coils 3A1 and 3A2 and the second coils 3B1 and 3B2 than the center in each of the first and second directions in the space 9.

[0045] In the XY cross section, each of the plurality of magnetic bodies 404 is formed in an elliptical cross section having a longitudinal axis in the X direction. In the XY cross section, each of the plurality of magnetic bodies 404 may be spaced apart at the same intervals from the corresponding coils 3A1 to 3B2 in the X direction. In the XY cross section, each of the plurality of magnetic bodies 404 may be spaced apart at the same intervals from the corresponding legs 21, 22 in the Y direction. Note that the number, arrangement, and / or shape of the plurality of magnetic bodies 404 are not limited to those described above and can be changed according to design specifications.

[0046] In this embodiment, there are provided a plurality of magnetic bodies 404. Each of the plurality of magnetic bodies 404 is disposed closer to each of the first coils 3A1 and 3A2 and the second coils 3B1 and 3B2 than the center in each of the first and second directions in the space 9. According to this embodiment, the leakage magnetic flux is attracted to the four corners of the space 9 (close to the magnetic bodies 404), so that the magnetic flux linkage to the first coils 3A1, 3A2 and / or the second coils 3B1, 3B2 can be more effectively suppressed, which contributes to further loss reduction.

[0047] Fifth Embodiment Fig. 11 is an enlarged cross-sectional view of a portion of the magnetically coupled reactor according to the fifth embodiment. Fig. 11 corresponds to a cross-sectional view of the magnetically coupled reactor cut along an XY plane passing through the center of the magnetically coupled reactor in the Z direction. Hereinafter, the magnetically coupled reactor according to the fifth embodiment will be described with reference to Fig. 11. In the configuration shown in Fig. 11, the same components as those in the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

[0048] In this embodiment, a spacer 505 for fixing the magnetic body 504 is further provided between the first leg 21 and the second leg 22. The spacer 505 is made of, for example, a synthetic resin. Note that the spacer 505 is not limited to the above, and may be made of any other material as long as it is non-magnetic and insulating. The configuration of the spacer 505 can be changed according to design specifications.

[0049] In this embodiment, the spacer 505 contacts the inner surfaces of the first coils 3A1 and 3A2 and the second coils 3B1 and 3B2 in the first direction. The spacer 505 contacts the inner surfaces of the first leg 21 and the second leg 22 in the second direction. In an XY cross-sectional view, the spacer 505 is formed in a rectangular frame-like cross-sectional shape having a longitudinal axis in the X direction. In an XY cross-sectional view, the magnetic body 504 is formed in a rectangular cross-sectional shape having a longitudinal axis in the X direction within the spacer 505. In an XY cross-sectional view, the magnetic body 504 may be spaced apart from each of the coils 3A1 to 3B2 at equal intervals in the X direction via the spacer 505. In an XY cross-sectional view, the magnetic body 504 may be spaced apart from each of the legs 21 and 22 at equal intervals in the Y direction via the spacer 505. The arrangement and / or shape of the spacer 505 and / or the magnetic body 504 are not limited to those described above and can be changed according to design specifications.

[0050] In this embodiment, a spacer 505 for fixing the magnetic body 504 is further provided between the first leg portion 21 and the second leg portion 22. According to this embodiment, the magnetic body 504 is fixed in a fixed position by the spacer 505, so that the magnetic flux linkage to the first coils 3A1, 3A2 and / or the second coils 3B1, 3B2 can be suppressed more stably.

[0051] In this embodiment, the spacer 505 contacts the inner surfaces of the first coils 3A1 and 3A2 and the second coils 3B1 and 3B2 in the first direction. According to this embodiment, the spacers 505 can fix the positions of the coils 3A1 to 3B2 in the first direction (the distance between the coils).

[0052] <Modification> In the above-described embodiment, the multilayer structure is divided in both the first and second directions in cross section, but this is not limiting. For example, the multilayer structure does not have to be divided in the second direction in cross section. The division of the multilayer structure can be changed according to design specifications.

[0053] In the above-described embodiment, the first coil and the second coil are each formed of a divided rectangular wire that is formed by combining multiple conductors, but this is not limited to this. For example, the first coil and the second coil may each be formed of a Litz wire. The configuration of the first coil and the second coil can be changed according to the design specifications.

[0054] In the above-described embodiment, an example has been described in which the first coil is wound separately around the first leg and the second leg, and the second coil is wound separately around the first leg and the second leg at a position spaced apart from the first coil in the first direction, but this is not limiting. For example, the first coil may be wound around the first leg, and the second coil may be wound around the second leg so that the directions of the magnetic flux generated by each coil are different. For example, the magnetic coupling reactor may be a concentrated winding type. The winding type of the magnetic coupling reactor can be changed according to design specifications.

[0055] In the above-described embodiment, the legs of the core are formed in a rectangular parallelepiped shape, but this is not limiting. For example, the legs may have a shape other than a rectangular parallelepiped. The core shape can be changed according to the design specifications.

[0056] Although one embodiment has been described above with reference to the drawings, the specific configuration is not limited to that described above, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the present disclosure, and the above-described embodiments can also be combined as appropriate. [Explanation of symbols]

[0057] REFERENCE SIGNS LIST 1...magnetically coupled reactor, 2...core, 3A1, 3A2...first coil, 3B1, 3B2...second coil, 9...space, 21...first leg, 22...second leg, 35...multilayer structure, 235...multilayer structure, 304...magnetic material, 404...magnetic material, 504...magnetic material, 505...spacer

Claims

1. a core having a first leg portion and a second leg portion extending in a first direction and facing each other in a second direction perpendicular to the first direction; a first coil and a second coil wound around the first leg portion and the second leg portion so that the directions of the magnetic fluxes generated by the first coil and the second coil are different from each other; When viewed in cross section along the first direction and the second direction, each of the first coil and the second coil includes a multi-layer structure divided at least in the first direction. Magnetically coupled reactor.

2. In the cross-sectional view, the multilayer structure is divided into the first direction and the second direction. The magnetically coupled reactor according to claim 1 .

3. Each of the first coil and the second coil is made of a divided rectangular wire formed by integrating a plurality of conducting wires into one. The magnetically coupled reactor according to claim 1 or 2.

4. the first coil is wound in a divided manner around the first leg portion and the second leg portion, the second coil is wound separately around the first leg portion and the second leg portion at a position spaced apart from the first coil in the first direction; The magnetically coupled reactor according to claim 1 or 2.

5. a magnetic body is further provided at a position spaced apart from the first leg portion, the second leg portion, the first coil, and the second coil in a space formed between the first leg portion and the second leg portion and between the first coil and the second coil, The magnetically coupled reactor according to claim 4 .

6. the magnetic body is disposed at the center of the space in each of the first direction and the second direction; The magnetically coupled reactor according to claim 5 .

7. A plurality of the magnetic bodies are provided, each of the plurality of magnetic bodies is disposed closer to each of the first coil and the second coil than the center in each of the first direction and the second direction in the space; The magnetically coupled reactor according to claim 5 .

8. a spacer for fixing the magnetic body between the first leg portion and the second leg portion; The magnetically coupled reactor according to claim 5 .

9. the spacer contacts the inner surfaces of the first coil and the second coil in the first direction; The magnetically coupled reactor according to claim 8 .

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