JP2018056336A - Laminate and composite laminate core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate and a composite magnetic core, which can suppress the reduction of a space factor of the laminate, and leakage of magnetic flux in a case of setting the composite magnetic core.SOLUTION: A laminate is formed by laminating a plurality of plate-like thin bands made of a soft magnetic material. Each plate-like thin band is constructed so that slits extended from an end part of an external side of the thin band to an inner surface part is formed. It is preferable that at lest one of the slits formed in each plate-like thin band has a form that is overlapped with or crossed with the slits of the other plate-like thin band when viewing a lamination direction. Also, it is preferable that each plate-like thin band is formed by cutting out from an alloy thin band of a long size obtained by a roll quick chilling method so that the long direction becomes a longitudinal direction, and each slit oriented from the end part of the external side of the longitudinal direction to the inner surface part is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminated body in which plate-shaped ribbons made of a soft magnetic material are laminated, and a composite product magnetic core using the laminated body.

  An alloy ribbon made of a soft magnetic material having an amorphous or nanocrystalline structure has excellent magnetic properties, and thus has been adopted as a material for magnetic cores such as a power distribution transformer and an electronic / electric circuit transformer. For example, a magnetic core in which amorphous or nanocrystalline alloy ribbons are laminated (hereinafter referred to as a “stacked magnetic core”) has a current loss at no load of about 1 / Therefore, it is expected as a magnetic core suitable for energy saving in recent years.

  An alloy ribbon used for a magnetic core is generally manufactured by a roll cooling method in which molten alloy is discharged from a nozzle onto a rotating copper alloy cooling roll and rapidly cooled.

Long alloy ribbons obtained by the roll cooling method tend to have different lengths in the width direction. Specifically, the end portion tends to be extended more than the center portion in the width direction. Therefore, when the alloy ribbon is spread so as to be laid on a flat surface, the alloy ribbon is flat at the center, but wrinkles are generated on the end side. This shows that the alloy ribbon has a so-called kelp-like form.
The wider the alloy ribbon is, the more difficult it is to cool uniformly in the width direction, and there is a tendency for the alloy ribbon to be wrinkled on the end side as described above.

In Patent Document 1, as described above, it is described that the shape of the amorphous alloy ribbon is in a state in which the end portion of the ribbon is extended, and a so-called ear wave is formed. For this reason, the alloy ribbon manufactured by the roll cooling method causes a difference in cooling rate between the roll contact surface and the air contact surface, and the center and end of the ribbon when the molten metal melts and solidifies into the ribbon. This is because the bending in the width direction described above occurs.
In Patent Document 1, it is proposed that the amount of the so-called saddle-like bend (warp) of the amorphous alloy ribbon constituting the wound iron core is kept to a predetermined value Cmm or less per 100 mm width of the ribbon. That is, when the radius of curvature of the portion constituting the iron core is rmm and the amount of bending in the width direction is Cmm per 100 mm width, when r ≦ 93, C ≦ −0.3 + 35, and when r> 93, C ≦ 7. It is said that a wound core with good iron loss can be obtained by using a satisfactory amorphous alloy ribbon as a wound core.

  By the way, it is difficult to use a wound core particularly in a large-sized magnetic core, such as a power distribution transformer or an electronic / electric circuit transformer. The reason for this is that a coil with a large magnetic core becomes thicker, so that the coil cannot be wound with a wound magnetic core. Therefore, when manufacturing a large magnetic core, a coil with a hollow and wound shape is prepared separately, and a laminated body of alloy ribbon is inserted into the hollow part of this coil and combined with other laminated bodies. Means using a magnetic core are taken. As the large composite magnetic core, for example, a laminate of plate-like ribbons having a width of 100 mm or more is used.

  For example, in Patent Document 2, when manufacturing an annular composite magnetic core, as shown in FIGS. 13 and 14, a laminated body for four sides is individually manufactured, and thereafter, the laminated body for four sides is assembled. As one unit, as shown in FIG. 15, a composite product magnetic core 10 that is stacked so that the contact portions between the stacked bodies do not overlap is disclosed.

  Patent Document 3 discloses a composite laminate in which a laminate of alloy ribbons manufactured by a roll cooling method is sandwiched between electromagnetic steel plates.

JP-A-7-283035 JP 2013-80856 A JP 2007-311652 A

As described above, the alloy ribbon obtained by the roll cooling method tends to have an end portion that is longer than the center portion. When laminating plate-like ribbons obtained from this alloy ribbon, a flat portion is laminated at the center, but a heel portion is laminated at the end side, so as illustrated in FIG. , A gap is easily formed inside the laminate, and the space factor is reduced.
Also, due to problems such as the thickness of the laminate being likely to be thicker than the predetermined thickness and the thickness being easily different between the central portion and the end of the laminate, the ends of the laminates in the form of FIGS. When the magnetic path is formed by abutting the portions, there is a problem that the end face of the sheet ribbon is shifted and a composite product magnetic core easily leaks magnetic flux.
Since the generation of wrinkles becomes more noticeable with wider alloy ribbons, this tendency is further spurred by large laminates and composite cores that use them.

  Accordingly, an object of the present invention is to provide a laminated body and a composite product core that can suppress a decrease in space factor and leakage of magnetic flux when a plurality of laminated bodies are combined in a magnetic path direction.

The present invention is a laminate in which a plurality of plate-like ribbons made of a soft magnetic material are laminated, and the plate-like ribbon is formed with a slit extending from the outer end of the ribbon to the inside of the surface. It is characterized by that.
It is preferable that at least one of the slits formed in each of the plate ribbons has a shape that does not overlap or intersect with the slits of the other plate ribbons when viewed from the stacking direction.
Further, the plate-like ribbon is cut from a long alloy ribbon obtained by a roll quenching method so that the longitudinal direction becomes the longitudinal direction, and outside the longitudinal direction. It is preferable that a slit is formed from the end toward the inside of the surface.
Moreover, it is preferable that the said slit is formed in parallel with the longitudinal direction of the said plate-shaped ribbon.
Moreover, the said plate-shaped ribbon can use the composition which uses Fe and Co as the main raw material and contains Si and B.
As the plate-like ribbon, one having a thickness of 7 μm or more and 35 μm or less can be used.
These laminates can be used for product magnetic cores.
Moreover, it can be set as the composite core by setting these laminated bodies as the state faced | matched by lamination | stacking end surfaces, and arrange | positioning as at least one part of a cyclic | annular magnetic path.

  As described above, a slit is formed in the plate-like ribbon from the outer end of the ribbon to the inside of the surface, and the laminate is obtained by laminating this plate-like ribbon, so that the wrinkles can be flattened. A laminate with a good volume ratio can be provided. Further, since the dimensional accuracy of the laminated body is improved, even if the laminated bodies are brought into contact with each other at the laminated end faces, a magnetic flux leakage is reduced and a composite magnetic core with less energy loss is obtained.

FIG. 3 is a perspective view for explaining a laminated body of Example 1. It is the 3rd page figure which showed the top view, front view, and side view of the laminated body of FIG. It is an external appearance photograph of the laminated body of this embodiment. It is an external appearance photograph of the laminated body for a comparison. 3 is a three-sided view of a laminated body of Example 2. FIG. It is a side view in the laminated body of another Example. It is a 3rd page figure of the laminated body of another Example. It is a 3rd page figure of the laminated body of another Example. It is a perspective view of the laminated body of the Example which inclined the edge part 45 degree | times. It is a perspective view of the composite laminated body which laminated | stacked different laminated bodies. It is a perspective view of another composite laminated body. FIG. 12 is a perspective view of a composite product core obtained by abutting the laminated end faces of the longitudinal end portions of the composite laminated body of FIGS. 10 and 11. It is a figure for demonstrating the form of a laminated body unit. It is a figure for demonstrating the form of another laminated body unit. It is a figure of the composite product magnetic core which laminated | stacked the laminated body unit. It is a figure which shows the cross-sectional state of the laminated body using the alloy ribbon which has a ridge.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited by these Examples.

The present invention is a laminate in which a plurality of plate-like ribbons made of a soft magnetic material are laminated, and the plate-like ribbon has a slit formed from the outer end of the ribbon to the inside of the surface. It is characterized by.
By forming slits (notches, etc.) that extend from the outer edge of the ribbon to the inside of the surface, if a pressing force is applied during lamination, both sides of the ribbon are flattened so that both sides of the ribbon are displaced, and the alloy The ribbon wrinkles are relieved by this slit. Therefore, it can suppress that the space factor of a laminated body falls, laminated body itself undulates, and the difference in the thickness of the center part and edge part after lamination | stacking can be performed.
It is preferable that the slit is formed in at least half of the plurality of plate-like ribbons. It is still more preferable if it is formed on all the sheets.

On the other hand, when the slit is formed only inside the surface of the sheet ribbon, the length of the center and end of the ribbon remains different. Strain continues to remain, and is not a measure to prevent wrinkles after lamination.
When a slit is inserted from the outer edge of the ribbon, the degree of freedom of each part separated from the slit increases, and each part moves freely by the pressure received during lamination, leading to suppression of wrinkles .

It is preferable that at least one of the slits formed in each of the plate ribbons has a shape that does not overlap or intersect with the slits of the other plate ribbons when viewed from the stacking direction.
When viewed in the stacking direction, the magnetic path is more easily formed and the leakage of the magnetic flux is more easily suppressed than in the form in which the slits overlap or intersect each other.
Preferably, the laminated body has a shape in which the slits formed in each plate-like ribbon do not overlap with or intersect with the slits of the adjacent plate-like ribbons when viewed in the lamination direction. Furthermore, it is easy to suppress leakage of magnetic flux.

The plate-like ribbon is cut from a long alloy ribbon obtained by a roll quenching method so that the longitudinal direction is the longitudinal direction, and the outer end in the longitudinal direction. It is preferable that a slit extending from the surface to the inside of the surface is formed. Since the slit is formed from the end portion in the longitudinal direction, the cut portion of the plate-shaped ribbon is easily spread in a fan shape in the longitudinal direction, so that generation of wrinkles can be easily suppressed. Further, it is possible to suppress the problem of cracking and tearing of the alloy ribbon that can occur when the slit is formed inside the ribbon, and the slit can be easily formed.
The slit is preferably formed in parallel to the longitudinal direction of the plate-like ribbon. Due to the shape of the magnetic core, the longitudinal direction is often a magnetic path, and if a slit is formed in parallel with the magnetic path, the slit will not interfere with the flow of magnetic flux, resulting in a decrease in energy efficiency when used as a composite product magnetic core. Can be suppressed. In addition, the slitting can be performed while conveying the alloy ribbon or the plate ribbon in the longitudinal direction, so that the processing is easy.

  The slit is preferably in a form having no width. When the slit has a width, when viewed from the lamination end face of the laminate, the area to be a magnetic path is reduced by the area of the product of the number of plate-like ribbons having the slit and the width of the slit. If the slit is a slit having no width, such as a part of a plate-shaped ribbon or a cut, it is possible to prevent a reduction in the area that becomes the magnetic path of the magnetic core.

It is preferable that the length sL of the slit is appropriately changed with respect to the length L of the plate ribbon. For example, is preferably formed with 0.1 × L ≦ sL. The generation of wrinkles when laminating can be further suppressed. The length of the slit is not particularly limited as long as it is shorter than the length of the sheet ribbon, but it is preferable to satisfy sL ≦ 0.5 × L in order to improve workability at the time of lamination.
The slit forming means can be a slitter device used for scissors, strip cutting and the like. The slitter is formed up to the inside of the ribbon without dividing the plate ribbon into a plurality of pieces.
As in the case of obtaining a sheet ribbon from an alloy ribbon, it is preferable to form a slit in the raw material before the heat treatment or one that has been heat-treated within a range not embrittled.

The plate ribbon preferably has a width W of 100 mm or more. In the present invention, since slits are made in the alloy ribbon, generation of wrinkles can be suppressed even when a wide laminate is manufactured, and the difference in thickness between the center portion and the end portion can be reduced. As a result, a laminate having a large space factor, excellent dimensional accuracy, and easy assembly can be produced.
Further, when the width is 100 mm or more, a large magnetic core can be formed with a small number of divided magnetic cores. In addition, a magnetic core having a width of 100 mm or more increases the necessity of reducing the excitation power, but the amorphous alloy ribbon is suitable for a material for a magnetic core having a width of 100 mm or more because the excitation power is reduced. .
The upper limit of the width of the amorphous alloy ribbon is not particularly limited, but if the width of the amorphous alloy ribbon is 1000 mm or less, the productivity (manufacturability) is still preferable. More preferably, it is 500 mm or less.

  In addition, when the alloy ribbon is stripped into a thinner plate ribbon, the generation of wrinkles is suppressed when the width of the plate ribbon is less than 70% of the width of the alloy ribbon. The However, since the yield is poor, it is not preferable in terms of cost. Therefore, it is preferable to apply the present invention when the width of the plate ribbon is 70% or more with respect to the width of the alloy ribbon in order to obtain the effect of the present invention at a low cost.

The plate-shaped ribbon is preferably one having a length L longer than the width W. This is because a shape that is long in the magnetic path direction is preferable in order for the laminate to be used as the magnetic path of the magnetic core. A preferred size is L ≧ 1.5 × Wmm or more, and L ≧ 2 × Wmm or more.
For use in a magnetic core, the thickness of the laminated body (thickness of the soft magnetic part) is preferably 0.1 mm or more. Furthermore, it is preferable to set it as 0.3 mm or more.

  The laminate may have irregularities on the end face of the laminate. Since the laminated body of the present invention is excellent in dimensional accuracy, it can be assembled with this unevenness without gaps with other magnetic cores. A laminate having different shapes can be combined and further laminated to form a composite laminate having irregularities formed at the ends.

The laminate may use the plate-shaped ribbon having a thickness of 7 μm or more and 35 μm or less. When the thickness is 7 μm or more, the mechanical strength of the alloy ribbon is ensured, and breakage of the alloy ribbon is suppressed. Thereby, continuous casting of the alloy ribbon becomes possible. The thickness of the alloy ribbon is preferably 9 μm or more.
Further, when the thickness is 35 μm or less, a stable amorphous state can be obtained in the alloy ribbon. The thickness of the alloy ribbon is more preferably 28 μm or less.

An alloy ribbon for obtaining the plate ribbon used in the present invention will be described.
The alloy ribbon is not particularly limited as long as it is a composition having the largest amount of Fe (iron) and Co (cobalt) among the contained metal elements. In addition to Fe, it is preferable to further contain Si (silicon) and B (boron).

For example, as the composition of the amorphous alloy ribbon, when the total content of Fe, Si, and B is 100 atomic%, the Fe content is 78 atomic% to 83 atomic%, and the Si content is An Fe-based amorphous alloy having a content of 3 atomic% to 10 atomic%, a B content of 10 atomic% to 15 atomic%, and the balance of impurities. When the Fe content is 78 atomic% or more, the saturation magnetic flux density of the alloy ribbon becomes higher, so that an increase in size or weight of a magnetic core manufactured using the alloy ribbon is further suppressed. When the Fe content is 83 atomic% or less, a decrease in the Curie point and a decrease in the crystallization temperature of the alloy are further suppressed, so that the stability of the magnetic properties of the magnetic core is further improved.
The Fe-based amorphous alloy may further contain C (carbon), which is an element contained in pure iron or the like that is a raw material for molten alloy. The C (carbon) content is preferably 0.5 atomic% or less. When the C (carbon) content is 0.5 atomic% or less, embrittlement of the alloy ribbon is further suppressed. The C (carbon) content is preferably 0.1 atomic% to 0.5 atomic%. When the content of C (carbon) is 0.1 atomic% or more, the productivity of the molten alloy and the alloy ribbon is excellent.

  An amorphous alloy ribbon that can be nanocrystallized can also be used. Examples of amorphous alloy ribbons that can be nanocrystallized include, for example, the general formula: (Fe1-aMa) 100-xyz-α-β-γCuxSiyBzM′αM ″ βXγ (atomic%) (where M is Co and And / or Ni, M ′ is at least one element selected from the group consisting of Nb, Mo, Ta, Ti, Zr, Hf, V, Cr, Mn and W, M ″ is A1, platinum group element, At least one element selected from the group consisting of Sc, rare earth elements, Zn, Sn, Re, X is at least one selected from the group consisting of C, Ge, P, Ga, Sb, In, Be, As X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, As, and Be, and a, x, y, z, α, β, and γ are respectively 0 ≦ a ≦ 0.5, 0.1 ≦ x ≦ 3, 0 ≦ y ≦ 30,0 Satisfy z ≦ 25,5 ≦ y + z ≦ 30,0 ≦ α ≦ 20,0 ≦ β ≦ 20 and 0 ≦ γ ≦ 20. The alloy composition represented by) may be used.

  A plate-shaped ribbon having a longitudinal direction can be obtained by cutting the elongated alloy ribbon obtained by the roll cooling method at two locations in the longitudinal direction. As a cutting method, known means such as a scissors or a cutting machine can be used. Since a metal ribbon tends to become brittle when heat-treated, it is preferable to cut a raw material before heat treatment or one that has been heat-treated within a range not brittle.

Next, an example of the laminating means for the plate-like ribbon and the subsequent steps will be described.
The plate-like ribbons are spread on a flat surface and stacked so as to be sequentially stacked.
When the laminated body is sandwiched between electromagnetic steel sheets, these operations can be performed on the electromagnetic steel sheets to be used.

After laminating the sheet ribbons, it is preferable to perform heat treatment for strain relief and nanocrystallization. If it is heat processing of distortion removal, it can carry out in the range of 200 to 350 degreeC. In the case of an amorphous alloy ribbon that can be nanocrystallized, it can be used in the range of 450 ° C. to 600 ° C. that allows nanocrystallization.
When heat-treating, it can be performed in a state where both surfaces of the laminate of the plate-like ribbon are fixed by applying pressure with a jig through a plate-like member. In addition, the layers of the plate ribbon can be bonded with a heat resistant resin. In addition, when the laminate is sandwiched between steel plates such as electromagnetic steel plates, it is desirable to fix the laminate and the steel plate with an adhesive after the heat treatment.

Below, the laminated body which is a present Example is demonstrated in detail.
FIG. 1 is a perspective view of a laminate 1a of the present embodiment, and FIG. 2 is a three-side view as viewed from the three directions.
The laminate 1a has a shape with a width W of 142 mm, a length L of 426 mm, and a thickness Ta of 0.78 mm.
The plate-shaped ribbon 2 used was obtained by cutting a long amorphous alloy ribbon obtained by a roll quenching method at two locations in the longitudinal direction so as to have a length of 426 mm. The amorphous alloy ribbon has a width of 142 mm and a thickness of 23 μm. The laminated body in FIG. 1 is obtained by laminating 30 layers of this plate-shaped ribbon. The end surface 4 consisting of the cut portions at both ends is perpendicular to the longitudinal direction of the laminate.
The plate-shaped ribbon 2 forms slits 3 each having a length sL of 70 mm in the longitudinal direction from both end portions (end surface 4) in the longitudinal direction.

Next, the formation position of the slit 3 of each plate-shaped ribbon will be described. As shown in FIG. 2, the uppermost plate-like ribbon is formed with a slit 3 at a position that becomes 1/6 width from the end in the width direction. Further, the plate-shaped ribbon of the second layer is shifted from the slit 3 of the ribbon on the uppermost surface by 1/6 width (2/6 width from the end portion) with respect to the full width. A slit is formed in Similarly, the 3rd layer, 4th layer and 5th layer of the thin ribbons are shifted by 1/6 width (from the end, the 3rd layer is 3/6 width, the 4th layer is 4 / A slit is formed at a position of 6/6 width and 5 / 6th width of the 5th layer).
A slit having the same length is formed at the same position every five layers. In the sixth layer, a slit that overlaps the first layer is formed in the stacking direction, but a slit is formed at a position that does not overlap with the seventh to tenth layers. Similarly, a slit that overlaps the second layer is formed in the seventh layer, but a slit is formed at a position that does not overlap with the slits in the sixth and eighth to eleventh layers.
In this way, when viewed in the stacking direction, at least one of the slits formed in each plate-shaped ribbon may partially overlap, but the other slits do not overlap or do not intersect. In the state where the positions of the slits are sequentially shifted, 30 plate-like ribbons are laminated.
The space factor of the laminated body of this embodiment was 88%.
An appearance photograph of the obtained laminate is shown in FIG.
A flat surface without wrinkles is obtained.

  For example, as shown in FIG. 15, this laminated body is sandwiched between steel plates 6 such as electromagnetic steel plates from above and below in the laminating direction to form a composite laminated body having a sandwich structure and can be used for a composite product magnetic core. . The laminated body is disposed as at least a part of an annular magnetic path in a state in which the laminated end faces are abutted with each other, and a coil can be disposed in a part of the magnetic path to be used as a magnetic core unit.

  For comparison, FIG. 4 shows a photograph of the appearance of a laminate obtained in the same manner as described above except that no slit is formed. A wrinkle can be confirmed on the upper surface of the laminate. The space factor of this laminated body was only about 67% (space factor about 59%) with respect to the laminated body of the laminated body of the embodiment.

5 to 8 illustrate another embodiment.
FIG. 5 shows a laminate 1b in which the position of the slit is changed with respect to the laminate 1a of FIG.
FIG. 6 is an end face in the longitudinal direction of the laminated body 1 in which the positions of the slits 3 are changed in all 30 layers when viewed in the laminating direction.
FIG. 7 shows a laminated body 1c in which the direction of the slit is set at an angle with respect to the longitudinal direction. The position of the slit is the same as that in FIG. 1 and the like at the end in the longitudinal direction, but the slit is inclined at an angle of 15 degrees. The slits in the fourth layer and the fifth layer have a shape that is line symmetric with respect to the first to third layers in the width direction.
FIG. 8 shows a laminate 1d in which the number of slits formed in the plate-like ribbon is increased.
Note that the slit is not limited to these embodiments, and the slit may be formed from the end in the short side direction (width direction) to the inside of the surface.

Below, the manufacturing method of the laminated body of the said embodiment is demonstrated.
The slit of the plate-like ribbon can be formed using a scissors.
30 sheets of the obtained sheet ribbon with slits are laminated. Thereafter, the laminate of the plate ribbon is held down by a plate-shaped steel plate, and is fixed with a jig in the thickness direction of the metal plate.
In this state, the laminate of the sheet ribbon is placed in a heat treatment furnace and heat treatment is performed.

9 to 12 are diagrams for explaining another embodiment of the present invention.
FIG. 9 is a perspective view of another laminated body 1e, in which plate-shaped ribbons whose longitudinal ends are inclined by 45 ° with respect to the longitudinal direction are laminated. The slits are formed at different positions in all layers. The number of layers is 30. This laminated body is restrained with a plate-shaped metal plate in the same manner as the above-mentioned laminated body, and is fixed by applying a pressure in the thickness direction of the metal plate with a jig, and the laminated body of the plate-shaped ribbon is placed in a heat treatment furnace. And heat-treated.

10 and 11 show composite laminates 5a and 5b in which different laminates are further laminated. FIG. 10 is a composite laminate 5a obtained by laminating the laminate 1e of FIG. 9 and another laminate. The upper and lower laminates are rectangular, and the length is the same as the longer side of the laminate 1e in the longitudinal direction. In the present embodiment, the laminated body 1e and the rectangular laminated body are alternately laminated in total three layers, but the number of laminated bodies may be further increased. FIG. 11 shows a composite laminate 5b obtained by laminating the laminate 1e shown in FIG. 9 and another laminate. The central laminate is rectangular and has the same length as the shorter side of the laminate 1e in the longitudinal direction.
In this way, by combining and laminating plate-like ribbons having different shapes, irregularities can be formed on the lamination end face.

FIG. 12 shows a composite core 10 in which the composite laminates of FIGS. 10 and 11 are combined. The composite laminates 5a and 5b have irregularities formed on at least a part of the laminated end faces, and these irregularities are fitted to other magnetic cores. Similarly, the plate-shaped ribbon has a longitudinal direction, and a slit is formed from the end of the ribbon to the inside of the surface.
By forming the slit in the plate-shaped ribbon, a laminated body having a large space factor is obtained, and leakage of magnetic flux is suppressed by abutting the joint surfaces. Moreover, since the thickness dimensions of the composite laminate are substantially the same, it is easy to combine such end portions with another magnetic core.
In addition, since the laminates can be easily assembled in this manner, it is easy to extend the magnetic path of the magnetic core. When this composite core is combined with a hollow coil, a large core unit, particularly a transformer core unit can be easily manufactured.

  1: laminated body, 2: plate-shaped ribbon, 3: slit, 5: composite laminate, 6: steel sheet, 10: composite core

Claims (8)

A laminate in which a plurality of sheet-like ribbons made of a soft magnetic material are laminated,
The plate-like ribbon is formed by forming a slit extending from the outer end of the ribbon to the inside of the surface.   2. At least one of the slits formed in each plate-like ribbon has a shape that does not overlap or intersect with other plate-like ribbon slits when viewed from the stacking direction. The laminated body of description.   The plate-like ribbon is cut from a long alloy ribbon obtained by a roll quenching method so that the longitudinal direction is the longitudinal direction, and the outer end in the longitudinal direction. The laminated body according to claim 1, wherein a slit extending from the inside toward the inside of the surface is formed.   The said slit is formed in parallel with the longitudinal direction of the said plate-shaped ribbon, The laminated body of Claim 3 characterized by the above-mentioned.   The laminate according to any one of claims 1 to 4, wherein the plate-like ribbon has a composition containing Fe and Co as main raw materials and Si and B.   The laminate according to any one of claims 1 to 5, wherein the plate-shaped ribbon has a thickness of 7 µm to 35 µm.   The laminate according to any one of claims 1 to 6, wherein the laminate is a product magnetic core.   A composite product core, wherein the laminated body according to claim 1 is disposed as at least a part of an annular magnetic path in a state in which the laminated end faces are abutted with each other.

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