JP5218446B2 - Magnetic parts - Google Patents

Description

  The present invention relates to a magnetic component having a core provided with an inner magnetic leg and an outer magnetic leg respectively disposed on the inner side and the outer side of a coil.

Examples of magnetic components having a coil and a core that forms a magnetic path of a magnetic field generated by energizing the coil include a transformer, a choke coil, and a reactor.
Among these, for example, there is a transformer having a primary coil and a secondary coil arranged in an insulated state, and a core that forms a magnetic path of a magnetic field generated by energizing the primary coil.

  As shown in FIG. 13, the core 9 in the transformer includes an inner magnetic leg 91 disposed inside the primary coil and the secondary coil, an outer magnetic leg 92 disposed outside the primary coil and the secondary coil, and an inner magnetic leg. Some have a connecting portion 93 that connects the leg 91 and the outer magnetic leg 92 at one end (Patent Document 1).

  In the transformer having the core 9 having such a shape, the magnetic flux formed by energizing the primary coil passes through the inner magnetic leg 91, the connecting part 93, and the outer magnetic leg 92 in order, and the inner magnetic leg 91 in the connecting part 93 Passes along the outer peripheral surface. This portion becomes the minimum magnetic path cross-sectional portion A in which the cross-sectional area perpendicular to the magnetic flux tends to be the smallest in the magnetic path of the connecting portion 93.

Furthermore, the thickness t of the connecting portion 93 tends to be reduced in response to the demand for miniaturization of the transformer. This is because the height of the inner magnetic leg 91 and the outer magnetic leg 92 is automatically determined according to the dimensions of the primary coil and the secondary coil. This is because the thickness t of 93 is only reduced.
As a result, the area of the minimum magnetic path cross-sectional portion A, which becomes a neck, becomes smaller and magnetic saturation at this portion may become a problem.
Therefore, it is conceivable to increase the outer peripheral length L (FIG. 14) of the inner magnetic leg 91 in order to increase the area of the minimum magnetic path section A as much as possible. This is because if the length L is increased, the area (L × t) of the minimum magnetic path section A can be ensured even if the thickness t of the connecting portion 93 is small.

Japanese Utility Model Publication No. 6-70219

However, when the length L of the outer periphery of the inner magnetic leg 91 is increased, the cross-sectional area perpendicular to the standing direction (equivalent to the area of the upper surface of the inner magnetic leg 91 shown in FIG. 14) becomes larger than necessary, and the material cost is increased. However, the problem of weight increase may arise.
In particular, when the shape is such that the center of gravity of all the outer magnetic legs 92 and the center of the inner magnetic legs 91 are shifted, the portion where the minimum magnetic path cross section A is formed is the inner side as shown in FIG. It becomes a part of the entire circumference of the magnetic leg 91. Therefore, if it is intended to increase the cross-sectional area of this portion, it is necessary to further increase the outer circumferential length L of the inner magnetic leg 91, and as a result, the cross-sectional area of the cross section perpendicular to the standing direction of the inner magnetic leg 91 is increased. It gets bigger. In this case, the region of the inner magnetic leg 91 that is far from the outer magnetic leg 92 is difficult to be used as a magnetic path, leading to an unnecessary increase in material cost and weight.
Needless to say, the above-described problems can occur not only in the transformer but also in other magnetic components.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a magnetic component that can be reduced in size, cost, and weight.

The present invention is a magnetic component having a coil and one or more cores constituting a magnetic path of a magnetic field generated by energizing the coil,
At least one of the cores includes an inner magnetic leg disposed inside the coil, one or more outer magnetic legs disposed outside the coil, the inner magnetic leg, and the outer magnetic leg. A multi-leg core having a connecting portion for connecting the two at one end of each other,
At least one of the multi-leg cores is configured such that the inner magnetic leg is in a direction perpendicular to the standing direction of the inner magnetic leg and on the side opposite to the center of gravity of all the outer magnetic legs. The magnetic component is a concave multi-leg core formed with a concave surface that is recessed toward the center of gravity of the magnetic leg.

  The magnetic component has at least one concave multi-leg core in which the inner magnetic leg forms the concave surface as the multi-leg core. Since the concave multi-leg core is provided with the concave surface, the volume of the inner magnetic leg can be reduced, and as a result, the volume of the concave multi-leg core can be reduced. Thereby, the weight of the core can be reduced and the weight of the magnetic component can be reduced.

  Moreover, the concave surface provided in the concave compound leg core is on the side surface opposite to the center of gravity of all the outer magnetic legs in the concave compound leg core. Therefore, even if the core material has been added so as to level the concave surface (see FIG. 10), the added portion corresponds to a portion of the inner magnetic leg that does not easily serve as a magnetic path. Removing this part has little effect on the formation of the magnetic field. That is, by forming the concave surface, it is possible to reduce the volume of the inner magnetic leg so that the formation of the magnetic field is hardly affected. As a result, the weight can be reduced without degrading the performance of the magnetic component.

  In addition, since the volume of the inner magnetic leg can be effectively reduced as described above, the volume of the inner magnetic leg can be increased even if the outer circumference of the inner magnetic leg in the portion facing the outer magnetic leg is increased. Can be prevented from becoming too large. As a result, without increasing the thickness of the connecting portion in the winding axis direction, the cross-section of the connecting portion along the outer peripheral surface of the inner magnetic leg of the portion facing the outer magnetic leg, which is the portion where magnetic saturation is most likely to occur. The area can be increased. In other words, the size of the core can be reduced without causing magnetic saturation, and the magnetic component can be reduced in size.

  As described above, according to the present invention, it is possible to provide a magnetic component that can be reduced in size, cost, and weight.

FIG. 3 is a developed perspective view of a transformer in the first embodiment. FIG. 3 is a perspective view of a transformer in the first embodiment. The top view of the transformer in the state which removed one core of the winding axis direction in Example 1. FIG. Sectional explanatory drawing of the trans | transformer equivalent to the CC arrow directional cross section of FIG. FIG. 2 is a plan view of a concave multi-leg core and a convex multi-leg core in Example 1. FIG. 3 is a perspective view of a concave multiple leg core according to the first embodiment. FIG. 6 is another perspective view of the concave multiple leg core in the first embodiment. FIG. 3 is a perspective view of a convex multiple leg core according to the first embodiment. Explanatory drawing of the length L of the outer periphery of an inner side magnetic leg in Example 1. FIG. Explanatory drawing of the "addition part B" for description of the effect of this invention. FIG. 6 is a perspective view of a pair of concave compound leg cores in Example 2. FIG. 6 is a plan view of a pair of concave multiple leg cores in Example 2. The perspective view of the core in background art. The top view of a core in background art.

  In the present invention, “the center of gravity of all the outer magnetic legs” means that, when the multi-leg core has a plurality of the outer magnetic legs, the aggregate when all the outer magnetic legs are regarded as one aggregate. When there is one outer magnetic leg of the multi-leg core, it becomes the geometric center of gravity of the outer magnetic leg.

Moreover, it is preferable that the said concave multiple leg core has a pair of plane part in the said side surface in the both sides of the said concave surface (Claim 2).
In this case, it is possible to suppress problems such as the occurrence of a defect in the concave multi-leg core during the manufacturing process of the magnetic part or during handling such as assembling to other parts. That is, for example, when a plurality of concave multi-leg cores contact each other at the side surfaces, if there are no flat portions on both sides of the concave surface, breakage or the like is likely to occur in these portions. Therefore, by providing a flat portion at this portion and bringing it into contact with another concave multi-leg core at the flat portion, the core is less likely to be damaged.

Further, it is preferable that the pair of plane portions are arranged on the same plane.
In this case, inconveniences such as a defect in the concave multi-leg core can be more effectively suppressed during the manufacturing process of the magnetic component and handling during assembly to other components. That is, for example, when a plurality of concave multi-leg cores are brought into contact with each other on the side surfaces, the pair of flat portions can be brought into surface contact with other concave multi-leg cores, so that the core is hardly damaged.

In addition, it is preferable to have a plurality of the multi-leg cores including at least one concave multi-leg core.
In this case, the core can be easily manufactured, and a core having a desired shape can be easily obtained.

The primary coil and the secondary coil have at least two multi-leg cores with the connecting portion arranged on one side in the winding axis direction, and one of the two multi-leg cores is The concave multi-leg core, and the other is a convex surface on the side of the inner magnetic leg that is orthogonal to the standing direction of the inner magnetic leg and opposite to the center of gravity of all the outer magnetic legs. A convex multi-leg core formed, and the inner magnetic leg of the convex multi-leg core has a smaller cross-sectional area perpendicular to the standing direction than the inner magnetic leg of the concave multi-leg core. (Claim 5).
In this case, magnetic saturation hardly occurs and a small magnetic component can be obtained. That is, the convex surface is provided on the inner magnetic leg of the convex multi-leg core so that the cross-sectional area of the inner magnetic leg of the convex multi-leg core having a small cross-sectional area perpendicular to the standing direction is as large as possible. Thereby, the magnetic path cross-sectional area in the inner magnetic leg of the convex multi-leg core is ensured.
On the other hand, the concave surface is provided on the inner magnetic leg of the concave multi-leg core so as to reduce the cross-sectional area of the inner magnetic leg of the concave multi-leg core having a large cross-sectional area perpendicular to the standing direction. Thereby, as mentioned above, the material cost of the concave multi-leg core can be reduced and the weight can be reduced without substantially affecting the formation of the magnetic field.
Then, by arranging the convex surface of the convex multi-leg core so as to face the concave surface of the concave multi-leg core, the space can be effectively used to reduce the size of the magnetic component.

Preferably, the magnetic component has at least a pair of concave multi-leg cores arranged so as to sandwich the primary coil and the secondary coil from both sides in the winding axis direction.
In this case, the magnetic component can be more effectively reduced in size, cost, and weight.

Example 1
A magnetic component according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1, 2, and 4, the magnetic component of this example includes a primary coil 21 and a secondary coil 22 that are arranged in an insulated state, and a magnetic field generated by energizing the primary coil 21. A transformer 1 having four cores 3 constituting a path.

The core 3 in this example includes an inner magnetic leg 31 disposed inside the primary coil 21 and the secondary coil 22, two outer magnetic legs 32 disposed outside the primary coil 21 and the secondary coil 22, and A multi-leg core having a connecting portion 33 that connects the inner magnetic leg 31 and the outer magnetic leg 32 at one end of each other.
Two of the four cores 3 are such that the inner magnetic legs 31 are in a direction perpendicular to the standing direction of the inner magnetic legs 31 and are opposite to the center of gravity G2 (FIG. 5) of all the outer magnetic legs 32. This is a concave multi-leg core 301 formed by forming a concave surface 311 that recedes toward the center of gravity of the outer magnetic leg 32 on the side surface.

As shown in FIG. 1, the primary coil 21 has a pair of terminals 211 and 212 formed by winding a conductor wire having an insulating film (not shown) on its outer peripheral surface and projecting both ends of the conductor wire outward. Have. On the other hand, the secondary coil 22 is formed by forming a conductor plate into a substantially C-shape with a part of a ring cut out (not shown). A pair of terminals 221 and 222 are drawn outward from a pair of opposite ends in the notch, and another terminal 223 is drawn outward from the opposite side of the notch.
As shown in FIGS. 1 and 4, two primary coils 21 are arranged so as to sandwich the secondary coil 22 from both sides. Further, since the primary coil 21 has an insulating coating as described above, electrical insulation from the secondary coil 22 is ensured.

  Further, as shown in FIG. 4, the primary coil 21 and the secondary coil 22 are wound around a resin bobbin 23. That is, the bobbin 23 has a pair of hooks disposed so as to sandwich the inner wall 231 disposed on the inner peripheral side of the primary coil 21 and the secondary coil 22 and the primary coil 21 and the secondary coil 22 from their axial directions. Part 232. As shown in FIG. 1, the terminals 211 and 212 of the primary coil 21 and the terminals 221, 222 and 223 of the secondary coil 22 extend outward from the pair of flange portions 232.

In addition, an installation portion 234 formed so as to connect the inner wall portion 231 is formed inside the substantially annular shape formed by the bobbin 23.
Thus, the coil module 2 is comprised by the bobbin 23 and the pair of primary coil 21 and secondary coil 22 which were wound around this.

As shown in FIGS. 2 and 4, two cores 3 are arranged in the winding axis direction of the coil module 2, that is, on one side and the other side in the winding axis direction of the primary coil 21 and the secondary coil 22. Has been. That is, in the two cores 3, the connecting portion 33 is disposed on one end surface (hereinafter referred to as “lower surface” for convenience) of the coil module 2 in the winding axis direction, and the inner magnetic leg 31 is disposed on the inner periphery of the coil module 2. The outer magnetic legs 32 are arranged on the outer peripheral side of the coil module 2.
In the other two cores 3, the connecting portion 33 is disposed on the other end surface of the coil module 2 in the winding axis direction (hereinafter referred to as “upper surface” for convenience), and the inner magnetic leg 31 is disposed in the coil module 2. The outer magnetic legs 32 are arranged on the outer peripheral side of the coil module 2.

Then, one of the two cores 3 arranged on the lower surface side of the coil module 2 and one of the two cores 3 arranged on the upper surface side are concave multi-leg cores 301 (FIGS. 6 and 7). It is.
Further, the other two cores 3 have a convex surface 312 on the side surface in which the inner magnetic leg 31 is orthogonal to the standing direction of the inner magnetic leg 31 and opposite to the center of gravity of all the outer magnetic legs 32. It is the convex multiple leg core 302 (FIG. 8) formed. As shown in FIG. 5, the inner magnetic leg 31 in the convex multi-leg core 302 has a cross-sectional area orthogonal to the standing direction (equivalent to the area of the upper surface of the inner magnetic leg 31 shown in FIG. 5). It is smaller than the inner magnetic leg 31 at 301.

  As shown in FIGS. 5 to 8, each core 3 has two outer magnetic legs 32. The core 3 is formed by integrally molding a magnetic body, and the inner magnetic leg 31, the outer magnetic leg 32, and the connecting portion 33 are integrally molded. In this example, one inner magnetic leg 31 and two outer magnetic legs 32 are erected from a connecting portion 33 having a certain thickness.

As shown in FIG. 5, the center of gravity G2 of the two outer magnetic legs 32 and the center of gravity G1 of the inner magnetic legs 31 are shifted. And the concave multiple leg core 301 and the convex multiple leg core 302 are arrange | positioned so that each inner magnetic leg 31 may mutually adjoin. Thereby, as shown in FIG. 3, the inner magnetic legs 31 of the concave multi-leg core 301 and the convex multi-leg core 302 can be arranged inside the coil module 2.
The concave multi-leg core 301 is formed with a concave surface 311 that recedes toward the center of gravity G2 on the side surface opposite to the center of gravity G2 among the side surfaces parallel to the standing direction of the inner magnetic leg 31.
On the other hand, the convex multi-leg core 302 forms a convex surface 312 protruding in a direction away from the center of gravity G2 on the side surface opposite to the center of gravity G2 among the side surfaces parallel to the standing direction of the inner magnetic leg 31. Become.

As shown in FIGS. 5 to 7, the concave multi-leg core 301 has a pair of plane portions 313 arranged on the same plane on the side surfaces on both sides of the concave surface 311. Similarly, as shown in FIGS. 5 and 8, the convex multi-leg core 302 has a pair of plane portions 313 arranged on the same plane on both sides of the convex surface 312.
Further, as shown in FIG. 7, the concave surface 311 and the flat surface portion 313 are also continuous with the connecting portion 33 along the standing direction of the inner magnetic leg 31. As shown in FIG. 8, the convex surface 311 and the flat surface portion 313 are also continuous with the connecting portion 33 along the standing direction of the inner magnetic leg 31.

  As shown in FIG. 3, the through space on the inner peripheral side of the coil module 2 is divided into a large through space 251 having a relatively large opening area and a small through space 252 having a relatively small opening area by the installation portion 234 in the bobbin 23. It is divided into two. The inner magnetic legs 31 of the concave multi-leg core 301 are arranged in the large through space 251, and the inner magnetic legs 31 of the convex multi-leg core 302 are arranged in the small through space 252.

  As shown in FIGS. 2 and 3, the terminals 211 and 212 of the primary coil 21 protrude outward from between the two outer magnetic legs 32 in the concave multi-leg core 301. In addition, the two terminals 221 and 222 of the secondary coil 22 project from one outer magnetic leg 32 in the concave multi-leg core 301 and one outer magnetic leg 32 in the convex multi-leg core 302 to form a concave multi-leg core. One terminal 223 of the secondary coil 22 protrudes from between the other outer magnetic leg 32 in the leg core 301 and the other outer magnetic leg 32 in the convex multi-leg core 302. Further, a part of the coil module 2 projects from between the two outer magnetic legs 32 in the convex multi-leg core 302.

  As shown in FIG. 3, the concave surface 311 of the concave multi-leg core 301 and the convex surface 312 of the convex multi-leg core 302 are in contact with the installation part 234 of the bobbin 23. Thereby, positioning with the core 3, the primary coil 21, and the secondary coil 22 is performed correctly.

  As shown in FIGS. 1, 2, and 4, the two concave multi-leg cores 301 sandwich the coil module 2 from the winding axis direction so that the inner magnetic legs 31 and the outer magnetic legs 32 face each other. The two convex multi-leg cores 302 also sandwich the coil module 2 from the winding axis direction so that the inner magnetic leg 31 and the outer magnetic leg 32 face each other. The inner magnetic legs 31 of all the cores 3 are disposed in the large through space 251 or the small through space 252 of the coil module 2.

Next, the function and effect of this example will be described.
The transformer 1 has a concave multi-leg core 301 in which the inner magnetic leg 31 forms a concave surface 311 as the core 3. Since the concave multiple leg core 301 is provided with the concave surface 311, the volume of the inner magnetic leg 31 can be reduced, and as a result, the volume of the concave multiple leg core 301 can be reduced. Thereby, the core 3 can be reduced in weight, and the transformer 1 can be reduced in weight.

  Further, as shown in FIG. 5, the concave surface 311 provided on the concave multi-leg core 301 is on the side surface of the concave multi-leg core 301 opposite to the center of gravity G <b> 2 of all the outer magnetic legs 32. Therefore, even if the core material is added so as to level the concave surface 311 as shown in FIG. 10, the added portion B corresponds to a portion of the inner magnetic leg 31 that does not easily serve as a magnetic path. For this reason, even if this portion B is removed, the formation of the magnetic field is hardly affected. That is, by forming the concave surface 311, the volume of the inner magnetic leg 31 can be reduced so as to hardly affect the formation of the magnetic field. As a result, weight reduction can be achieved without degrading the performance of the transformer 1.

  Further, as described above, since the volume of the inner magnetic leg 31 can be effectively reduced, the length L (FIG. 9) of the outer periphery of the inner magnetic leg 31 at the portion facing the outer magnetic leg 32 is increased. However, it is possible to prevent the volume of the inner magnetic leg 31 from becoming too large. As a result, without increasing the thickness t (FIG. 4) of the connecting portion 33 in the winding axis direction, the outer peripheral surface of the inner magnetic leg 31 at the portion facing the outer magnetic leg 32, which is the portion where magnetic saturation is most likely to occur. It is possible to increase the area of the cross-section (minimum magnetic path cross-section portion A: see FIGS. 4 and 7) of the connecting portion 33 along the line. In other words, the size of the core 3 can be reduced without causing magnetic saturation, and the transformer 1 can be reduced in size.

  As shown in FIGS. 5 and 7, since the concave multi-leg core 3 has a pair of flat portions 313, the concave multi-leg core 3 is not damaged during the manufacturing process of the transformer 1 or during handling such as assembly to other parts. Problems such as occurrence can be suppressed. For example, in the manufacturing process of the transformer 1, a plurality of concave multi-leg cores 301 may be formed and then conveyed by a conveyor or the like. In this case, if both side portions of the concave surface 311 protrude, the portions may come into contact with the cores 3 and other objects, and a defect may occur. Therefore, by providing the flat portion 313 in this portion, the contact between the cores 3 and other objects becomes a surface contact, and a defect that the core 3 is lost can be prevented.

  As shown in FIGS. 1 and 2, the transformer 1 includes a concave multi-leg core 301 and a convex multi-leg core 302 arranged on the lower surface side and the upper surface side of the coil module 2, respectively. The inner magnetic leg 31 in the core 302 has a smaller cross-sectional area perpendicular to the standing direction than the inner magnetic leg 31 in the concave multi-leg core 301. Thereby, magnetic saturation hardly occurs and a small transformer 1 can be obtained.

  That is, as shown in FIG. 5, in order to increase the cross-sectional area of the inner magnetic leg 31 of the convex multi-leg core 302 whose cross-sectional area perpendicular to the standing direction is small, the inner magnetic leg 31 of the convex multi-leg core 302 is as large as possible. Is provided with a convex surface 312. Thereby, the magnetic path cross-sectional area in the inner magnetic leg 31 of the convex multi-leg core 302 is ensured.

On the other hand, a concave surface 311 is provided on the inner magnetic leg 31 of the concave multi-leg core 301 so as to reduce the cross-sectional area of the inner magnetic leg 31 of the concave multi-leg core 301 having a large cross-sectional area perpendicular to the standing direction. . Thereby, as mentioned above, the material cost of the concave multi-leg core 311 can be reduced and the weight can be reduced without substantially affecting the formation of the magnetic field.
Then, by arranging the convex surface 312 of the convex multi-leg core 302 so as to oppose the concave surface 311 of the concave multi-leg core 302, the transformer 1 can be miniaturized by effectively using the space.

  As described above, according to this example, it is possible to provide a transformer that can be reduced in size, cost, and weight.

(Example 2)
This example is an example of a transformer 1 using four concave multiple leg cores 301 as shown in FIGS. That is, the upper and lower two convex multi-leg cores 302 in Example 1 are replaced with the concave multi-leg cores 301.
The configuration of these four concave multi-leg cores 301 is the same as that shown in the first embodiment (FIGS. 6 and 7).

Further, the concave multi-leg core 301 is provided in place of the convex multi-leg core 302 in the first embodiment, so that the shape of the coil unit 2 (see FIGS. 1 and 3) is also four concave multi-leg cores. The inner magnetic leg 31 is changed in accordance with the outer shape.
11 and 12, the coil unit 2 and the pair of concave multiple leg cores 301 on the upper surface side are omitted.
Others are the same as in the first embodiment.

In the case of this example, the area of the cross section perpendicular to the protruding direction of the inner magnetic leg 31 can be reduced while securing the area of the minimum magnetic path cross section A in the four concave compound leg cores 301. As a result, the transformer 1 can be effectively reduced in size, cost, and weight.
In addition, the same effects as those of the first embodiment are obtained.

The present invention is not limited to the above embodiments, and can be applied to various forms of transformers.
For example, the multi-leg core can be arranged only in one of the coil modules 2 in the winding axis direction. In this case, a flat core can be provided on the other side of the coil module 2 in the winding axis direction.
In addition, the multi-leg core can have only one outer magnetic leg 32, or can have three or more.
The present invention is not limited to the transformer, and can be applied to other magnetic components such as a choke coil and a reactor.

DESCRIPTION OF SYMBOLS 1 Transformer 2 Coil module 21 Primary coil 22 Secondary coil 3 Core 301 Concave multiple leg core 31 Inner magnetic leg 311 Concave surface 32 Outer magnetic leg 33 Connection part

Claims (6)

A magnetic component having a coil and one or more cores constituting a magnetic path of a magnetic field generated by energizing the coil,
At least one of the cores includes an inner magnetic leg disposed inside the coil, one or more outer magnetic legs disposed outside the coil, the inner magnetic leg, and the outer magnetic leg. A multi-leg core having a connecting portion for connecting the two at one end of each other,
At least one of the multi-leg cores is configured such that the inner magnetic leg is in a direction perpendicular to the standing direction of the inner magnetic leg and on the side opposite to the center of gravity of all the outer magnetic legs. A magnetic component comprising a concave multi-leg core formed by forming a concave surface that is retracted toward the center of gravity of a magnetic leg.   The magnetic component according to claim 1, wherein the concave multi-leg core has a pair of flat portions on the side surfaces on both sides of the concave surface.   The magnetic component according to claim 2, wherein the pair of plane portions are arranged on the same plane.   The magnetic component according to any one of claims 1 to 3, comprising a plurality of the multi-leg cores including at least one concave multi-leg core.   5. The magnetic component according to claim 4, comprising at least two compound leg cores each having the connecting portion disposed on one side in the winding axis direction of the coil, One is the concave multi-leg core, and the other is the inner magnetic leg convex in the direction perpendicular to the standing direction of the inner magnetic leg and on the side opposite to the center of gravity of all the outer magnetic legs. A convex multi-leg core formed with a surface, and the inner magnetic leg in the convex multi-leg core has a cross-sectional area perpendicular to the standing direction than the inner magnetic leg in the concave multi-leg core. Magnetic component characterized by being small.   6. The magnetic component according to claim 4, wherein the magnetic component has at least a pair of concave multiple leg cores arranged so as to sandwich the primary coil and the secondary coil from both sides in the winding axis direction. Magnetic parts characterized by

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