JP2021163901A - Magnetic core and coil component - Google Patents

Abstract

To provide an appropriate magnetic core having anisotropic permeability and a coil component including the magnetic core.SOLUTION: A magnetic ore 1 includes a plurality of tabular magnetic pieces 2 and a binder 4 which binds the tabular magnetic pieces 2. The plurality of tabular magnetic pieces 2 are mainly oriented along a predetermined plane (XY plane). Each tabular magnetic piece 2 is composed of a plurality of integral magnetic powder grains 3. Each magnetic powder grain 3 is insulation coated. Each tabular magnetic piece 2 is a compressed body composed of a plurality of magnetic powder grains, for example.SELECTED DRAWING: Figure 1

Description

The present invention relates to a magnetic core and a coil component including the magnetic core.

Patent Document 1 describes a technique for forming a magnetic path between a core having a relatively high magnetic permeability (hereinafter, “high μ core”) and a core having a relatively low magnetic permeability (hereinafter, “low μ core”). It is disclosed. Specifically, the coil component of Patent Document 1 includes a core member and a coil wound around the core member. The winding shaft of the coil extends in the vertical direction. The coil has an inner peripheral surface, an outer peripheral surface, and a first end surface and a second end surface that are continuous with the inner peripheral surface and the outer peripheral surface, respectively. The core member has a dust core as a high μ core and a cast core as a low μ core. Here, the casting core is formed by dispersing and arranging magnetic powder in a cured resin. The dust core is above the first straight line extending horizontally along the first end face of the coil in a predetermined cross section in which the coil component is cut in a plane including the winding shaft of the coil and the magnetic path circulating in the core member. And below the second straight line extending horizontally along the second end face of the coil. Here, the horizontal direction is a direction orthogonal to the vertical direction. The casting core is located inside the inner peripheral surface of the coil in the horizontal direction or outside the outer peripheral surface of the coil in the horizontal direction in the above-mentioned predetermined cross section, and is sandwiched between the dust cores in the vertical direction. There is. By arranging the high μ cores above and below the coil and the low μ cores inside and outside the coil in the horizontal direction in this way, the magnetic flux trajectory can be made closer to a rectangle, thereby alternating current around the corners of the coil. Copper loss can be significantly reduced.

Japanese Patent No. 6552332

For example, considering the magnetic path in the coil component of Patent Document 1, a relatively high magnetic permeability is required in the high μ core in the horizontal direction, and a relatively low magnetic permeability is required in the low μ core. It is up and down. In other words, the magnetic permeability in the vertical direction does not have to be relatively high in the high μ core, and the magnetic permeability in the horizontal direction does not have to be relatively low in the low μ core. However, since the magnetic permeability of the dust core and the casting core is isotropic, when the dust core is used as a high μ core, the magnetic permeability in the vertical direction is unnecessarily high, and the casting core is used as a low μ core. When used, there is a problem that the magnetic permeability in the horizontal direction is unnecessarily low. Considering this problem, if an appropriate magnetic core having anisotropy in magnetic permeability can be developed, the above-mentioned waste of magnetic permeability can be eliminated, and other effects such as cost reduction may be obtained instead. ..

Therefore, an object of the present invention is to provide an appropriate magnetic core having anisotropy in magnetic permeability and a coil component including the magnetic core.

The present invention comprises the first magnetic core.
A magnetic core including a plurality of plate-shaped magnetic pieces and a binder for binding the plate-shaped magnetic pieces.
The plurality of plate-shaped magnetic pieces are mainly oriented along a predetermined plane.
Each of the plate-shaped magnetic pieces is composed of a plurality of integrated magnetic powder particles, and each of the magnetic powder particles provides an insulatingly coated magnetic core.

Further, the present invention is a first magnetic core as a second magnetic core.
Each of the plate-shaped magnetic pieces provides a magnetic core which is a compressed body composed of a plurality of magnetic powder particles.

Further, the present invention is a first or second magnetic core as the third magnetic core.
Each of the plate-shaped magnetic pieces provides a magnetic core in which the ratio D / t of the maximum length D to the thickness t is 3 or more and 100 or less.

Further, the present invention is a third magnetic core as the fourth magnetic core.
Provided is a magnetic core having a ratio D / t of 5 or more and 50 or less.

Further, the present invention is any one of the first to fourth magnetic cores as the fifth magnetic core.
Each of the plate-shaped magnetic pieces provides a magnetic core having an area larger than a circle having a diameter of 1 mm and having a maximum length D of 20 mm or less.

Further, the present invention is a fifth magnetic core as the sixth magnetic core.
A magnetic core having a maximum length D of 10 mm or less is provided.

Further, the present invention is any one of the first to sixth magnetic cores as the seventh magnetic core.
Further, a magnetic piece having a size smaller than that of the plate-shaped magnetic piece is provided.
The magnetic pieces provide a magnetic core arranged between the plate-shaped magnetic pieces.

Further, the present invention provides, as a first coil component, a coil component including a core member including at least a part of any one of the first to seventh magnetic cores and a coil wound around the core member. offer.

Further, the present invention is the first coil component as the second coil component.
The winding shaft of the coil extends in a predetermined direction and
The core member surrounds at least a part of the circumference of the coil.
The magnetic core provides a coil component in which the predetermined plane is arranged so as to be orthogonal to the predetermined direction.

Further, the present invention is a second coil component as a third coil component.
The coil has an inner peripheral surface, an outer peripheral surface, and a first end surface and a second end surface that are continuous with the inner peripheral surface and the outer peripheral surface, respectively.
The core member includes a first core member, a second core member, a third core member, and a fourth core member.
The first core member has a predetermined cross section obtained by cutting the coil component in a plane including a winding shaft of the coil and a magnetic path orbiting in the core member in the predetermined direction along the first end surface of the coil. It is located outside the first straight line extending in the orthogonal direction orthogonal to the above predetermined direction.
The second core member is located outside in the predetermined direction with respect to the second straight line extending in the orthogonal direction along the second end surface of the coil in the predetermined cross section.
The third core member is located inside the inner peripheral surface of the coil in the orthogonal direction in the predetermined cross section, and is formed into the first core member and the second core member in the predetermined direction. It is sandwiched and
The fourth core member is located outside the outer peripheral surface of the coil in the orthogonal direction in the predetermined cross section, and is sandwiched between the first core member and the second core member in the predetermined direction. And
At least one of the first core member, the second core member, the third core member, and the fourth core member provides a coil component made of the magnetic core.

Further, the present invention is a third coil component as a fourth coil component.
The third core member and the fourth core member provide a coil component made of the magnetic core.

Further, the present invention is a fourth coil component as a fifth coil component.
The first core member and the second core member provide a coil component made of the magnetic core.

Further, the present invention is a fourth coil component as a sixth coil component.
The first core member and the second core member provide a coil component made of a dust core.

Further, the present invention is a third coil component as the seventh coil component.
The first core member and the second core member are composed of the magnetic core.
The third core member and the fourth core member provide a coil component composed of a cast core in which magnetic powder is dispersed and arranged in a cured resin.

Further, the present invention is the first coil component as the eighth coil component.
The winding shaft of the coil extends parallel to the predetermined plane.
The core member surrounds a part around the coil.
The magnetic path orbiting in the core member provides a coil component along the predetermined plane.

Since the plate-shaped magnetic material (plate-shaped magnetic piece) has shape magnetic anisotropy, it is easy to magnetize in the direction along the plate surface, but it is difficult to magnetize in the thickness direction. Is. If such a plate-shaped magnetic piece is oriented along a predetermined surface to form a magnetic core, it is possible to obtain a magnetic core having a high magnetic permeability in the predetermined surface and a low magnetic permeability in a direction orthogonal to the predetermined surface. can. Here, considering that the realistic magnetic core has a certain size in the direction orthogonal to the predetermined surface and the alignment treatment of the plate-shaped magnetic piece, the plate-shaped magnetic piece itself must be large to some extent. Otherwise, proper orientation will not be possible. On the other hand, if the size of the plate-shaped magnetic piece itself becomes large, an eddy current loss may occur when a magnetic flux along the thickness direction of the plate-shaped magnetic piece acts on the plate-shaped magnetic piece.

Since the magnetic core of the present invention is formed by orienting plate-shaped magnetic pieces, the magnetic permeability is anisotropic as described above. In addition, each plate-shaped magnetic piece is obtained by integrating a plurality of magnetic powder particles each insulatingly coated by press working or the like. Therefore, even if the size of the plate-shaped magnetic piece is increased to some extent, the generation of eddy current can be suppressed. That is, the plate-shaped magnetic piece of the present invention can be easily oriented and can suppress the occurrence of eddy current loss.

In addition, when the plate-shaped magnetic pieces having a certain size are oriented to form a magnetic core, a large number of portions where the plate-shaped magnetic pieces are separated from each other are formed particularly in a predetermined in-plane direction. Therefore, the total volume of the magnetic material constituting the magnetic core is considerably smaller than the volume of the magnetic core. That is, the number of magnetic materials constituting the magnetic core can be reduced, and the cost of the magnetic core can be reduced in terms of materials.

Further, in the magnetic core of the present invention, the magnetic permeability in the direction orthogonal to the predetermined plane becomes low. Therefore, if the magnetic core of the present invention is used in a place where a low μ core is required, it is not necessary to form a magnetic gap or the like. That is, the magnetic core can be structurally simple, and the cost can be reduced in terms of manufacturing.

It is a figure which shows the magnetic core by embodiment of this invention. It is a figure which shows the plate-shaped magnetic piece contained in the magnetic core of FIG. It is a figure for demonstrating the manufacturing method of the magnetic core of FIG. It is another figure for demonstrating the manufacturing method of the magnetic core of FIG. It is a figure which shows the magnetic core by the modification. It is a figure which shows a part of the predetermined cross section of the coil component by 1st Embodiment of this invention. In the figure, the plate-shaped magnetic piece is omitted. It is sectional drawing which shows the coil component by 1st Example. It is a figure which shows the structure of the core in particular of the coil component by 1st Example. In the figure, the plate-shaped magnetic piece is omitted. It is a figure which shows the coil component by 2nd Example. In the figure, the plate-shaped magnetic piece is omitted. It is a figure which shows the coil component by 3rd Example. In the figure, the plate-shaped magnetic piece is omitted. It is a figure which shows the coil component by 4th Example. In the figure, the plate-shaped magnetic piece is omitted. It is a figure which shows the core member which comprises the coil component by the 2nd Embodiment of this invention. It is a figure which shows the coil component by 2nd Embodiment.

Referring to FIG. 1, the magnetic core 1 according to the embodiment of the present invention includes a plurality of plate-shaped magnetic pieces 2 and a binder 4 for binding the plate-shaped magnetic pieces 2. The plurality of plate-shaped magnetic pieces 2 are mainly oriented along a predetermined plane. In the present embodiment, the predetermined plane is the XY plane. Each of the plate-shaped magnetic pieces 2 is composed of a plurality of integrated magnetic powder particles 3. Each of the magnetic powder particles 3 is insulatingly coated. As the material of the insulating coat, for example, a Si resin or a phosphoric acid-based coating is used.

Referring to FIG. 2, the plate-shaped magnetic piece 2 according to the present embodiment is a compressed body composed of a plurality of magnetic powder particles 3. That is, the plate-shaped magnetic piece 2 is formed by compression molding a plurality of magnetic powder particles 3. The magnetic powder grain 3 according to the present embodiment is a water atomized powder. However, the present invention is not limited to this. For example, the magnetic powder grain 3 may be a gas atomized powder. The material of the powder granules is not particularly limited, and for example, pure iron, nanocrystals, sendust, Fe—Si alloy, amorphous alloy and the like can be used. Compression molding according to this embodiment is performed using a roller compactor. However, the present invention is not limited to this. For example, the plate-shaped magnetic piece 2 may be formed by press molding.

The plate-shaped magnetic piece 2 according to the present embodiment is obtained by sorting compression-molded plate-shaped magnetic pieces through a sieve having a predetermined opening.

Specifically, referring to FIG. 2, each of the plate-shaped magnetic pieces 2 according to the present embodiment has a ratio D / t of the maximum length D and the thickness t of 3 or more and 100 or less. This is because if the ratio is smaller than 3, it is difficult to orient the plate-shaped magnetic piece 2, and if the ratio is larger than 100, the strength of the plate-shaped magnetic piece 2 decreases and the plate-shaped magnetic piece 2 is deformed. Preferably, in each plate-shaped magnetic piece 2, the ratio D / t is 5 or more and 50 or less. This is because when the lower limit ratio D / t is 5 or more, the plate-shaped magnetic piece 2 is more easily oriented than when the ratio D / t is less than 5. Further, when the upper limit ratio D / t is 50 or less, the strength of the plate-shaped magnetic piece 2 is higher than when the ratio D / t is larger than 50, and the orientation operation such as vibration described later is performed. This is because the plate-shaped magnetic piece 2 is unlikely to be damaged at the time.

Further, each plate-shaped magnetic piece 2 has an area larger than a circle having a diameter of 1 mm and a maximum length D of 20 mm or less. This is because if the area is smaller than a circle having a diameter of 1 mm, it is difficult to orient the plate-shaped magnetic piece 2, and if the maximum length D is larger than 20 mm, it is difficult for the plate-shaped magnetic piece 2 to enter the gap between the other plate-shaped magnetic pieces 2. .. Preferably, the maximum length D of each plate-shaped magnetic piece 2 is 10 mm or less. When the maximum length D is 10 mm or less, the plate-shaped magnetic piece 2 is more easily oriented than when the maximum length D is larger than 10 mm, and when each plate-shaped magnetic piece 2 is oriented, another plate-shaped magnetic piece 2 is oriented. This is because it is easy to get into the gap between them.

Here, in order to remove the strain generated by the compression molding, annealing may be performed. The timing of annealing may be before sorting using a sieve or after sorting.

The plate-shaped magnetic pieces 2 selected in this manner are spread and oriented in the case 60 as shown in FIGS. 3 and 4. After that, the epoxy resin to be the binder 4 is vacuum-impregnated, the gap between the plate-shaped magnetic pieces 2 is filled with the epoxy resin, and the epoxy resin is cured to form the magnetism composed of the plate-shaped magnetic pieces 2 and the binder 4 shown in FIG. Get core 1. Here, the binder 4 may be a resin or other material other than the epoxy resin. Further, the case 60 may not be used in the alignment treatment of the plate-shaped magnetic piece 2. Further, for the orientation treatment of the plate-shaped magnetic piece 2, vibration may be applied to the case 60 before or after filling the resin, or a magnetic field may be applied to the plate-shaped magnetic piece 2 in the case 60 after filling the resin. May be added. Further, the method of filling the gap between the plate-shaped magnetic pieces 2 with the material of the binder 4 may be a method other than vacuum impregnation such as a casting method.

The magnetic core 1 formed in this way has a high magnetic permeability in the direction along the predetermined plane due to the shape anisotropy of the plate-shaped magnetic piece 2, while it has a high magnetic permeability in the direction orthogonal to the predetermined plane. Has a low magnetic permeability. In FIG. 1, the magnetic permeability in the direction parallel to the XY plane is high, and the magnetic permeability in the Z direction is low. As described above, according to the present embodiment, it is possible to increase the magnetic permeability in the required direction while suppressing the total amount of the magnetic material used. Further, each of the plate-shaped magnetic pieces 2 is an aggregate of magnetic powder particles 3 coated with insulation. Therefore, in the plate-shaped magnetic piece 2, the generation of eddy current is suppressed.

The above-mentioned magnetic core 1 is composed of a plate-shaped magnetic piece 2 and a binder 4, but the present invention is not limited to this. For example, the magnetic core 1A according to the modification shown in FIG. 5 further includes a plurality of plate-shaped magnetic pieces 2 and a binder 4, as well as a magnetic piece 5 having a size smaller than that of the plate-shaped magnetic piece 2. As can be seen from FIG. 5, each magnetic piece 5 is arranged between the plate-shaped magnetic pieces 2. Other points are the same as the magnetic core 1A according to the embodiment shown in FIG. 1 described above. Each magnetic piece 5 may be composed of one magnetic powder particle or a plurality of magnetic powder particles as long as it is a magnetic material having a size that fits in the gap between the plate-shaped magnetic pieces 2. There may be. In the former case, for example, each of the magnetic pieces 5 may be a flattened atomized powder grain. Further, in the latter case, each magnetic piece 5 may be formed by compression molding a plurality of magnetic powder particles.

As shown in FIG. 6, the coil component 10 according to the first embodiment of the present invention includes a core member 20 including at least a part of the magnetic core 1 as described above, and a coil wound around the core member 20. It has 40 and. Specifically, in the coil component 10 according to the present embodiment, the winding shaft 42 of the coil 40 extends in a predetermined direction. In the present embodiment, the predetermined direction is the vertical direction or the Z direction. The core member 20 surrounds at least a part around the coil 40. FIG. 6 is a part of a predetermined cross section in which the coil component 10 is cut on a plane including the winding shaft 42 of the coil 40 and the magnetic path 22 orbiting in the core member 20. The illustrated coil 40 is located in the core member 20 in a predetermined cross section, but the coil 40 may not be located in the core member 20 in a place other than the predetermined cross section.

Specifically, the coil 40 has an inner peripheral surface 44, an outer peripheral surface 45, and a first end surface 46 and a second end surface 47 that are continuous with the inner peripheral surface 44 and the outer peripheral surface 45, respectively, in a predetermined cross section. In the present embodiment, the first end face 46 is the upper end face and the second end face 47 is the lower end face. The core member 20 includes a first core member 24, a second core member 25, a third core member 26, and a fourth core member 27.

The first core member 24 is located outside the first straight line 50 extending in the orthogonal direction along the first end surface 46 of the coil 40 in a predetermined cross section in a predetermined cross section. Here, the orthogonal direction is a direction orthogonal to a predetermined direction, and in the present embodiment, is a horizontal direction or a Y direction. That is, the first core member 24 is located outside in the Z direction with respect to the first straight line 50 extending in the Y direction along the first end surface 46 of the coil 40 in a predetermined cross section. The second core member 25 is located outside the second straight line 52 extending in the orthogonal direction along the second end surface 47 of the coil 40 in a predetermined cross section in a predetermined cross section. The second core member 25 is located outside the second straight line 52 extending in the Y direction along the second end surface 47 of the coil 40 in the Z direction in a predetermined cross section. The third core member 26 is located inside the inner peripheral surface 44 of the coil 40 in a predetermined cross section in a direction orthogonal to the inner peripheral surface 44, and is sandwiched between the first core member 24 and the second core member 25 in a predetermined direction. There is. That is, the third core member 26 is located inside the inner peripheral surface 44 of the coil 40 in the Y direction in a predetermined cross section, and is sandwiched between the first core member 24 and the second core member 25 in the Z direction. It has been. The fourth core member 27 is located outside the outer peripheral surface 45 of the coil 40 in a predetermined cross section in a direction orthogonal to the outer peripheral surface 45, and is sandwiched between the first core member 24 and the second core member 25 in a predetermined direction. .. That is, the fourth core member 27 is located outside the outer peripheral surface 45 of the coil 40 in the Y direction in a predetermined cross section, and is sandwiched between the first core member 24 and the second core member 25 in the Z direction. ing.

At least one of the first core member 24, the second core member 25, the third core member 26, and the fourth core member 27 is composed of the magnetic core 1 shown in FIG. The predetermined plane (that is, the orientation plane) is arranged so as to be orthogonal to the predetermined direction.

Referring to the description of Patent Document 1, the first core member 24 and the second core member 25 have a high magnetic permeability in the Y direction, and the third core member 26 and the fourth core member 27 have a low permeability in the Z direction. If it has a magnetic coefficient, the trajectory of the magnetic flux can be made close to a rectangular shape, and thereby the AC copper loss can be reduced. As described above, the magnetic core 1 has a high magnetic permeability along a predetermined plane due to the shape anisotropy of the plate-shaped magnetic piece 2, but has a low magnetic permeability in the direction orthogonal to the predetermined plane. .. Therefore, in the coil component 10 including the magnetic core 1 according to the present embodiment, the AC copper loss can be reduced. In addition, since the magnetic powder particles 3 constituting the plate-shaped magnetic piece 2 are insulated-coated, the generation of eddy currents is also suppressed. Further, if the magnetic core 1 is arranged so that the predetermined plane (that is, the alignment plane) is orthogonal to the predetermined direction in the third core member 26 and the fourth core member 27, it is not necessary to provide the magnetic gap. That is, the structure is simplified, and the cost can be reduced in terms of manufacturing.

In the following, some examples of the coil component 10 according to the first embodiment having a more specific configuration will be described. The coil parts according to the examples listed below have a so-called pot core configuration.

Referring to FIGS. 7 and 8, the coil component 10A according to the first embodiment includes a core member 20A and a coil 40. Since the coil 40 is the same as the coil 40 according to the above-described embodiment, the description thereof will be omitted.

The core member 20A according to the first embodiment includes a first core member 24A, a second core member 25A, a third core member 26A, and a fourth core member 27A, which are integrally formed. Each of the first core member 24A, the second core member 25A, the third core member 26A, and the fourth core member 27A is composed of the magnetic core 1 shown in FIG. That is, all the core members 20A according to the first embodiment are composed of the magnetic core 1 of FIG. The orientation plane (that is, a predetermined plane) of the plate-shaped magnetic piece 2 of the magnetic core 1 is mainly orthogonal to the extending direction (predetermined direction) of the winding shaft 42.

In order to form such a coil component 10A, for example, after arranging the coil 40 in the case (not shown), a mixture of the plate-shaped magnetic piece 2 and the resin of the binder 4 is poured into the case. There is a way. However, if the size of the plate-shaped magnetic piece 2 is large, it may be difficult for the mixture to flow. In that case, a method may be adopted in which the coil 40 is arranged in the case, and then the plate-shaped magnetic piece 2 is further spread and oriented in the case to impregnate the resin which is the material of the binder 4.

Referring to FIG. 9, the coil component 10B according to the second embodiment includes a core member 20B and a coil 40. The coil 40 is the same as the coil 40 according to the first embodiment described above. On the other hand, the core member 20B has a first core member 24B, a second core member 25B, a third core member 26B, and a fourth core member 27B, which are separately formed. However, the material is the same as the core member 20A of the first embodiment of FIG. Generally, the larger the size of the plate-shaped magnetic piece 2, the easier it is to align, but it is difficult to align in a narrow space such as between the coil 40 and the case. Therefore, separately, the shape of the magnetic core 1 that has been oriented and cured may be adjusted to form the first core member 24B, the second core member 25B, the third core member 26B, and the fourth core member 27B. In any of the first core member 24B, the second core member 25B, the third core member 26B, and the fourth core member 27B, the orientation plane of the plate-shaped magnetic piece 2 of the magnetic core 1 is mainly orthogonal to a predetermined direction. ..

Referring to FIG. 10, the coil component 10C according to the third embodiment includes a core member 20C and a coil 40. The coil 40 is the same as the coil according to the first embodiment described above. On the other hand, the core member 20C has a first core member 24C, a second core member 25C, a third core member 26C, and a fourth core member 27C, which are separately formed. Here, the first core member 24C and the second core member 25C are so-called dust cores. On the other hand, the third core member 26C and the fourth core member 27C are composed of the magnetic core 1 of FIG. In the third core member 26C and the fourth core member 27C, the orientation plane of the plate-shaped magnetic piece 2 of the magnetic core 1 is mainly orthogonal to a predetermined direction. In this embodiment, the first core member 24C and the second core member 25C are dust cores, but may be composed of, for example, laminated steel plates.

Referring to FIG. 11, the coil component 10D according to the fourth embodiment includes a core member 20D and a coil 40. The coil 40 is the same as the coil according to the first embodiment described above. On the other hand, the core member 20D has a first core member 24D, a second core member 25D, a third core member 26D, and a fourth core member 27D, which are separately formed. Here, the first core member 24D and the second core member 25D are composed of the magnetic core 1 of FIG. On the other hand, the third core member 26D and the fourth core member 27D are composed of a cast core in which magnetic powder is dispersed and arranged in a cured resin.

With reference to FIGS. 12 and 13, the coil component 10E according to the second embodiment of the present invention includes a so-called EE core. Specifically, the coil component 10E includes a core member 20E and a coil 40. The coil 40 is the same as the coil according to the first embodiment described above. The core member 20E includes an integrated first core member 24E, a second core member 25E, a third core member 26E, and a fourth core member 27E. Unlike the first to fourth embodiments described above, the core member 20E surrounds only a part around the coil 40.

The first core member 24E, the second core member 25E, the third core member 26E, and the fourth core member 27E of the present embodiment are all made of the magnetic core 1 of FIG. That is, the core member 20E according to the present embodiment is composed of the magnetic core 1 of FIG. However, the relationship between the orientation direction of the plate-shaped magnetic piece 2 of the magnetic core 1 and the magnetic path is different from that of the first embodiment described above. In this embodiment, the winding shaft of the coil 40 is in the X direction. Further, the plate-shaped magnetic piece 2 in the magnetic core 1 is oriented along an XY plane (predetermined plane). That is, in the present embodiment, the winding shaft of the coil 40 extends parallel to a predetermined plane. Further, the magnetic path that goes around the core member 20E is along a predetermined plane. That is, the core member 20E made of the magnetic core 1 has a relatively high magnetic permeability along the magnetic path.

Although the present invention has been described above with various examples, the present invention is not limited thereto. For example, in each of the coil components described above, the magnetic core 1A of FIG. 5 may be used instead of the magnetic core 1 of FIG.

1,1A Magnetic core 2 Plate-shaped magnetic piece 3 Magnetic powder grain 4 Binder 5 Magnetic piece 10, 10A, 10B, 10C, 10D, 10E Coil part 20, 20A, 20b, 20C, 20D, 20E Core member 22 Magnetic path 24, 24A, 24B, 24C, 24D, 24E 1st core member 25, 25A, 25B, 25C, 25D, 25E 2nd core member 26, 26A, 26B, 26C, 26D, 26E 3rd core member 27, 27A, 27B, 27C , 27D, 27E 4th core member 40 Coil 42 Winding shaft 44 Inner peripheral surface 45 Outer peripheral surface 46 1st end surface 47 2nd end surface 50 1st straight line 52 2nd straight line 60 Case

Claims (15)

A magnetic core including a plurality of plate-shaped magnetic pieces and a binder for binding the plate-shaped magnetic pieces.
The plurality of plate-shaped magnetic pieces are mainly oriented along a predetermined plane.
Each of the plate-shaped magnetic pieces is composed of a plurality of integrated magnetic powder particles, and each of the magnetic powder particles is an insulatingly coated magnetic core. The magnetic core according to claim 1.
Each of the plate-shaped magnetic pieces is a magnetic core which is a compressed body composed of a plurality of magnetic powder particles. The magnetic core according to claim 1 or 2.
Each of the plate-shaped magnetic pieces is a magnetic core in which the ratio D / t of the maximum length D and the thickness t is 3 or more and 100 or less. The magnetic core according to claim 3.
A magnetic core having a ratio D / t of 5 or more and 50 or less. The magnetic core according to any one of claims 1 to 4.
Each of the plate-shaped magnetic pieces has an area larger than a circle having a diameter of 1 mm and a magnetic core having a maximum length D of 20 mm or less. The magnetic core according to claim 5.
A magnetic core with a maximum length D of 10 mm or less. The magnetic core according to any one of claims 1 to 6.
Further, a magnetic piece having a size smaller than that of the plate-shaped magnetic piece is provided.
The magnetic piece is a magnetic core arranged between the plate-shaped magnetic pieces. A coil component including a core member including at least a part of the magnetic core according to any one of claims 1 to 7, and a coil wound around the core member. The coil component according to claim 8.
The winding shaft of the coil extends in a predetermined direction and
The core member surrounds at least a part of the circumference of the coil.
The magnetic core is a coil component arranged so that the predetermined plane is orthogonal to the predetermined direction. The coil component according to claim 9.
The coil has an inner peripheral surface, an outer peripheral surface, and a first end surface and a second end surface that are continuous with the inner peripheral surface and the outer peripheral surface, respectively.
The core member includes a first core member, a second core member, a third core member, and a fourth core member.
The first core member has a predetermined cross section obtained by cutting the coil component in a plane including a winding shaft of the coil and a magnetic path orbiting in the core member in the predetermined direction along the first end surface of the coil. It is located outside the first straight line extending in the orthogonal direction orthogonal to the above predetermined direction.
The second core member is located outside in the predetermined direction with respect to the second straight line extending in the orthogonal direction along the second end surface of the coil in the predetermined cross section.
The third core member is located inside the inner peripheral surface of the coil in the orthogonal direction in the predetermined cross section, and is formed into the first core member and the second core member in the predetermined direction. It is sandwiched and
The fourth core member is located outside the outer peripheral surface of the coil in the orthogonal direction in the predetermined cross section, and is sandwiched between the first core member and the second core member in the predetermined direction. And
At least one of the first core member, the second core member, the third core member, and the fourth core member is a coil component made of the magnetic core. The coil component according to claim 10.
The third core member and the fourth core member are coil parts made of the magnetic core. The coil component according to claim 11.
The first core member and the second core member are coil parts made of the magnetic core. The coil component according to claim 11.
The first core member and the second core member are coil parts made of a dust core. The coil component according to claim 10.
The first core member and the second core member are composed of the magnetic core.
The third core member and the fourth core member are coil parts made of a cast core in which magnetic powder is dispersed and arranged in a cured resin. The coil component according to claim 8.
The winding shaft of the coil extends parallel to the predetermined plane.
The core member surrounds a part around the coil.
The magnetic path that goes around the core member is a coil component that runs along the predetermined plane.

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