JP5529669B2 - Magnetic element manufacturing method and magnetic element - Google Patents

Description

  The present invention relates to a method for manufacturing a magnetic element and a magnetic element manufactured thereby.

  A method for producing a magnetic element by pouring a mixture of magnetic powder and resin in a state where a coil is placed in a container (mold) into the container and heating and curing the mixture as a magnetic core (so-called “ The casting method "is known (see, for example, Patent Document 1 and Patent Document 2).

  In particular, in the manufacturing method of Patent Document 1, the coil is energized during heat curing to accelerate the curing of the mixture (paragraph 0007 in Patent Document 1 and upper left column on page 4 of Patent Document 2). See bottom paragraph).

JP 2008-135549 A Japanese Patent Laid-Open No. 48-1724

  However, according to the manufacturing methods of Patent Document 1 and Patent Document 2, a magnetic element having preferable direct current superposition characteristics cannot be obtained. Therefore, the magnetic elements of Patent Document 1 and Patent Document 2 are not suitable for applications in which a large current flows, such as a reactor used in a power circuit such as an in-vehicle inverter.

  Therefore, an object of the present invention is to provide an improved casting method and a magnetic element manufactured thereby so as to obtain a magnetic element having preferable direct current superposition characteristics.

According to the present invention, as a method of manufacturing the first magnetic element,
A casting step of pouring a mixture of magnetic powder and resin into the container with the coil disposed in the container;
A curing step of curing the mixture to form a magnetic core while at least temporarily energizing or after energizing an electrical path including a section that passes through the inside of the coil and is parallel to the axis of the coil. Is obtained.

According to the present invention, as a method of manufacturing the second magnetic element, the method of manufacturing the first magnetic element,
The container is made of a conductive material, and has an outer peripheral wall portion, a bottom portion that closes a lower end of the outer peripheral wall portion, and an energization member that extends upward from the bottom portion,
In the casting step, the coil is disposed in the container so that the energizing member is located inside the coil, and the mixture is poured into the container,
In the curing step, a method of manufacturing a magnetic element that energizes the electrical path after connecting the energization member and the outer peripheral wall portion by means other than the bottom portion to form the electrical path is obtained.

According to the present invention, as a third magnetic element manufacturing method, the first magnetic element manufacturing method comprises:
The container is made of a conductive material, and has an outer peripheral wall portion and a bottom portion that closes a lower end of the outer peripheral wall portion,
In the casting step, the coil is placed in the container so that the current-carrying member is located inside the coil in a state where the current-carrying member is disposed in the container so as to contact the bottom and extend upward. And pouring the mixture into the container,
In the curing step, a method of manufacturing a magnetic element that energizes the electrical path after connecting the current-carrying member and the outer peripheral wall portion of the container by means other than the bottom portion to form the electrical path is obtained.

According to the present invention, as a fourth magnetic element manufacturing method, a second or third magnetic element manufacturing method,
In the curing step, a method of manufacturing a magnetic element that energizes the electrical path by connecting the current-carrying member and the outer peripheral wall portion in parallel at two or more locations is obtained.

According to the present invention, as a fifth magnetic element manufacturing method, the first magnetic element manufacturing method comprises:
The container has a cylindrical energizing member accommodating portion, an outer peripheral wall portion, and a bottom portion connecting the energizing member accommodating portion and the outer peripheral wall portion,
In the casting step, the coil is arranged in the container so that the energizing member accommodating portion is located inside the coil, and the mixture is poured into the container,
In the curing step, a magnetic element manufacturing method is obtained in which an energization member is inserted into the energization member housing and the energization member is energized.

According to the present invention, as a sixth magnetic element manufacturing method, the first magnetic element manufacturing method comprises:
The container has a cylindrical part, an outer peripheral wall part, and a bottom part connecting the cylindrical part and the outer peripheral wall part,
In the casting step, the coil is disposed in the container so that the cylindrical portion is located inside the coil, and the mixture is poured into the container.
In the curing step, a method of manufacturing a magnetic element that energizes the conducting wire in a state where the conducting wire is wound around the container so as to pass through the inside of the cylindrical portion is obtained.

Furthermore, according to the present invention, as a seventh magnetic element manufacturing method, a sixth magnetic element manufacturing method,
In the curing step, a method of manufacturing a magnetic element in which the conductive wire is wound around the container for two or more turns is obtained.

Moreover, according to the present invention,
A case made of a conductive material, comprising an outer peripheral wall portion, a bottom portion that closes a lower end of the outer peripheral wall portion, and a current-carrying member that extends upward from the bottom portion;
A coil disposed in the case so as to surround the energizing member;
A magnetic element comprising a magnetic core formed by pouring a mixture of magnetic powder and resin into the case and curing the mixture in a state where the coil is at least partially embedded in the mixture is obtained.

Moreover, according to the present invention,
A case made of a conductive material, and a case having an outer peripheral wall portion and a bottom portion closing the lower end of the outer peripheral wall portion;
An energization member disposed in the case so as to be in contact with the bottom and extending upward from the bottom;
A coil disposed in the case so as to surround the energizing member;
A magnetic element comprising a magnetic core formed by pouring a mixture of magnetic powder and resin into the case and curing the mixture in a state where the coil is at least partially embedded in the mixture is obtained.

Moreover, according to the present invention,
A case having a cylindrical energizing member accommodating portion, an outer peripheral wall portion, and a bottom portion connecting the energizing member accommodating portion and the outer peripheral wall portion;
A coil disposed in the case so as to surround the energizing member accommodating portion;
A magnetic element comprising a magnetic core formed by pouring a mixture of magnetic powder and resin into the case and curing the mixture in a state where the coil is at least partially embedded in the mixture is obtained.

Moreover, according to the present invention,
A case having a cylindrical portion, an outer peripheral wall portion, and a bottom portion connecting the cylindrical portion and the outer peripheral wall portion;
A coil disposed in the case so as to surround the cylindrical portion;
A magnetic element comprising a magnetic core formed by pouring a mixture of magnetic powder and resin into the case and curing the mixture in a state where the coil is at least partially embedded in the mixture is obtained.

  When an electric path including a section that passes through the inside of the coil and is parallel to the axis of the coil is energized, a magnetic field that circulates around the section is generated when the coil is viewed from above, and the inside of the mixture This is expected to affect the arrangement of the magnetic powder. For example, when the magnetic powder is not spherical, it is expected that the magnetic powder will be oriented due to its shape, and when the magnetic powder is spherical, like a skewer Expected to line up in a row. Furthermore, since the magnetic field generated by energizing the electric path described above is orthogonal to the magnetic field during operation of the magnetic element (“operating magnetic field”), most of the magnetic powder is oriented in the direction orthogonal to the operating magnetic field. Expected to be aligned. According to the orientation / alignment of the magnetic powder, the magnetic resistance during the operation of the magnetic element can be increased, so that a magnetic element having excellent direct current superposition characteristics can be obtained.

1 is a perspective view showing a magnetic element according to a first embodiment of the present invention. It is a perspective view which shows the case (container: type | mold) and coil which comprise the magnetic element of FIG. FIG. 3 is a cross-sectional view showing the magnetic element of FIG. 1 along the line III--III. It is a figure which shows the electricity supply state in the manufacturing method of the magnetic element of FIG. It is a perspective view which shows the magnetic element by the 2nd Embodiment of this invention. It is a perspective view which shows the case (container: type | mold) and coil which comprise the magnetic element of FIG. FIG. 7 is a cross-sectional view showing the magnetic element of FIG. 5 along the line VII--VII. It is a perspective view which shows the magnetic element by the 3rd Embodiment of this invention. It is a perspective view which shows the case (container: type | mold) and coil which comprise the magnetic element of FIG. It is sectional drawing which shows the magnetic element of FIG. 8 along the XX line. It is a perspective view which shows the manufacturing method of the magnetic element by the 4th Embodiment of this invention.

  The method for manufacturing a magnetic element according to an embodiment of the present invention includes two steps, a casting step and a curing step. In the casting step, a mixture of magnetic powder and resin is poured into the container with the coil disposed in the container (mold). In the curing step, the mixture is cured to form a magnetic core while at least temporarily energizing or after energizing an electrical path including a section passing through the inside of the coil and parallel to the axis of the coil.

  By energizing the electrical path as described above, a magnetic field that circulates around the axis of the coil is generated, and by aligning and aligning the magnetic powder by the magnetic field, good direct current superposition characteristics are obtained. The magnetic element which has can be obtained. Hereinafter, a method for manufacturing a magnetic element according to a plurality of embodiments will be described in detail with reference to the drawings, particularly a specific structure relating to formation of an electrical path.

(First embodiment)
1 to 3, the magnetic element 10a according to the first embodiment of the present invention includes a case (container: mold) 20a, a coil 30a, and a magnetic core 40a.

  The case 20a is made of a conductive material, and as shown in FIGS. 2 and 3, the outer peripheral wall 22a, a bottom 24a that closes the lower end of the outer peripheral wall 22a, and extends upward from the bottom 24a. And an energizing member 26a. That is, the energizing member 26a according to the present embodiment is integrally formed with the outer peripheral wall portion 22a and the bottom portion 24a. The energization member 26a is located near the center of the bottom 24a.

  The coil 30a has an edgewise coil having a substantially cylindrical shape obtained by edgewise winding an insulated flat wire (in this embodiment, a flat copper wire). In particular, in the coil 30a according to the present embodiment, the edgewise coil is included with an insulating resin from the viewpoint of improving the withstand voltage characteristics of the edgewise coil.

  The coil 30a is disposed in the case 20a so that the energization member 26a is located inside (that is, the energization member 26a is surrounded by the coil 30a in the radial direction). In the present embodiment, in a state where the coil 30a is disposed in the case 20a, the axis of the coil 30a extends along the vertical direction and coincides with the axis of the energizing member 26a.

  The magnetic core 40a is formed by curing a slurry-like mixture obtained by mixing magnetic powder and resin. As the magnetic powder, for example, metal powder can be used. Specifically, dust powder such as gas atomized powder or water atomized powder of 6.5% Fe—Si material can be used. As the resin, for example, a thermosetting liquid resin can be used. Specifically, the resin preferably has a low viscosity from the viewpoint of ensuring fluidity when made into a slurry. An example of this type of resin is an epoxy resin. The mixture may be mixed with alumina powder, silica powder, or the like in order to adjust the magnetic permeability.

  The magnetic core 40a is obtained by pouring the mixture into the case 20a in a state where the coil 30a is arranged in the case 20a as described above, and curing the mixture.

  In the present embodiment, a magnetic field that conducts electricity to the energizing member 26a during the curing process or before the curing process and thereby circulates around the axis of the coil 30a (see the arrow in FIG. 3). The magnetic powder is oriented and aligned by the magnetic field. In the magnetic core 40a of the magnetic element 10a thus manufactured, the magnetic permeability in the circumferential direction (direction in which the coil 30a is wound) and the magnetic permeability in the direction orthogonal to the circumferential direction are different by 5% or more. For this reason, the magnetic element 10a can exhibit favorable direct current superposition characteristics.

  Specifically, the energization member 26a is energized by connecting the energization member 26a and the outer peripheral wall portion 22a by means other than the bottom portion 24a, and configuring an electrical path that passes through the outer peripheral wall portion 22a, the bottom portion 24a, and the energization member 26a. This is done by passing electricity through the electrical path. At this time, if there is only one path connecting the energization member 26a and the outer peripheral wall portion 22a, a leakage magnetic flux is generated, and there is a possibility that a magnetic field that circulates over the entire circumference cannot be created. Accordingly, it is preferable to supply power while the energization member 26a and the outer peripheral wall portion 22a are connected in parallel at two or more locations. From this point of view, in the present embodiment, power is supplied while being connected in parallel at four locations as shown in FIG.

  The magnetic element 10a manufactured by the manufacturing method according to the present embodiment has excellent direct current superposition characteristics as described above in addition to the structural features such as including the energization member 26a erected in the case 20a. have. Therefore, the magnetic element 10a is suitable for the application of a large current such as a reactor used in a power circuit such as an in-vehicle inverter.

(Second Embodiment)
In the magnetic element 10a according to the first embodiment described above, the energizing member 26a was formed as a part of the case (container: mold) 20a (see FIG. 3), but is shown in FIGS. As shown, the magnetic element 10b according to the second embodiment of the present invention is separate from the case (container: mold) 20b (see in particular FIG. 7).

  Specifically, referring to FIGS. 5 to 7, the magnetic element 10b according to the present embodiment includes a case (container: mold) 20b, an energizing member 26b, a coil 30b, and a magnetic core 40b.

  The case 20b is made of a conductive material, and includes an outer peripheral wall portion 22b and a bottom portion 24b that closes the lower end of the outer peripheral wall portion 22b, as shown in FIGS.

  The energizing member 26b is disposed in the case 20b so as to be in contact with the bottom 24b and extend upward from the bottom 24b. The energizing member 26b according to the present embodiment has a shape similar to a bobbin and is located near the center of the bottom 24b.

  The coil 30b is the same as the coil 30a according to the first embodiment. The coil 30b is disposed in the case 20b so that the energization member 26b is located inside (that is, encloses the energization member 26b in the radial direction by the coil 30b). In the present embodiment, in a state where the coil 30b is disposed in the case 20b, the axis of the coil 30b extends along the vertical direction and coincides with the axis of the energizing member 26b.

  The magnetic core 40b is made of the same material as the magnetic core 40a according to the first embodiment. The magnetic core 40b is obtained by pouring the mixture into the case 20b in a state where the coil 30b is disposed in the case 20b as described above, and curing the mixture.

  In the present embodiment, a magnetic field that conducts electricity to the energizing member 26b during the curing process or before the curing process, and thereby circulates around the axis of the coil 30b (see the arrow in FIG. 7). The magnetic powder is oriented and aligned by the magnetic field. In the magnetic core 40b of the magnetic element 10b thus manufactured, the magnetic permeability in the circumferential direction (direction in which the coil 30b is wound) and the magnetic permeability in the direction orthogonal to the circumferential direction are different by 5% or more. For this reason, the magnetic element 10b can exhibit a favorable direct current superimposition characteristic.

  Specifically, the energization member 26b is energized by connecting the energization member 26b and the outer peripheral wall portion 22b by means other than the bottom portion 24b, and configuring an electrical path that passes through the outer peripheral wall portion 22b, the bottom portion 24b, and the energization member 26b. This is done by passing electricity through the electrical path. Also in the present embodiment, for the same reason as in the first embodiment, it is preferable to supply power while the energization member 26b and the outer peripheral wall portion 22b are connected in parallel at two or more locations.

  In addition to the structural feature that the magnetic element 10b manufactured by the manufacturing method according to the present embodiment includes the energization member 26b disposed and fixed in the case 20b, as described above, it has excellent direct current superposition characteristics. have. Therefore, the magnetic element 10b is suitable for an application in which a large current flows, as in the first embodiment.

(Third embodiment)
In the method for manufacturing the magnetic elements 10a and 10b according to the first and second embodiments described above, a current is passed through the energizing members 26a and 26b that are part of the magnetic elements 10a and 10b (FIGS. 3 and 7), as shown in FIG. 10, in the method of manufacturing the magnetic element 10c according to the third embodiment of the present invention, a current-carrying member 50 separate from the magnetic element 10c is used. A magnetic field is generated by passing a current.

  Specifically, referring to FIGS. 8 to 10, the magnetic element 10c according to the present embodiment includes a case (container: mold) 20c, a coil 30c, and a magnetic core 40c.

  As shown in FIGS. 9 and 10, the case 20c includes a cylindrical energizing member accommodating portion 26c, an outer peripheral wall portion 22c, and a bottom portion 24c that connects the energizing member accommodating portion 26c and the outer peripheral wall portion 22c. ing. The energizing member accommodating portion 26c extends upward from the bottom portion 24c and is located near the center of the bottom portion 24c.

  The coil 30c is the same as the coil 30a according to the first embodiment. The coil 30c is disposed in the case 20c so that the energizing member accommodating portion 26c is positioned inside thereof (that is, the energizing member accommodating portion 26c is surrounded by the coil 30c in the radial direction). In the present embodiment, in a state where the coil 30c is disposed in the case 20c, the axis of the coil 30c extends along the vertical direction and coincides with the axis of the energizing member accommodating portion 26c.

  The magnetic core 40c is made of the same material as the magnetic core 40c according to the first embodiment. The magnetic core 40c is obtained by pouring the mixture into the case 20c in a state where the coil 30c is disposed in the case 20c as described above and curing the mixture.

  In the present embodiment, the energizing member 50 is inserted into the energizing member accommodating portion 26c during the curing process or before the curing process, and electricity is passed to the energizing member 50, thereby the shaft of the coil 30c. A magnetic field (see an arrow in FIG. 10) that circulates around is generated, and the magnetic powder is oriented and aligned by the magnetic field. In the magnetic core 40c of the magnetic element 10c thus manufactured, the magnetic permeability in the circumferential direction (direction in which the coil 30c is wound) and the permeability in the direction orthogonal to the circumferential direction are different by 5% or more. For this reason, the magnetic element 10c can exhibit favorable direct current superposition characteristics.

  In addition to the structural feature that the magnetic element 10c manufactured by the manufacturing method according to the present embodiment includes the current-carrying member accommodating portion 26c that penetrates the case 20c in the vertical direction, as described above, it has an excellent direct current. Has superimposition characteristics. Therefore, the magnetic element 10c is suitable for applications in which a large current flows, as in the first embodiment.

(Fourth embodiment)
In the manufacturing method of the magnetic elements 10a, 10b, and 10c according to the first to third embodiments described above, a current is passed through the energizing members 26a, 26b, and 50 (see FIGS. 3, 7, and 10). The magnetic field may be generated by other means.

  Referring to FIG. 11, in a magnetic element 10d according to a fourth embodiment of the present invention, a conducting wire 60 is wound around a case (container: mold) 20d and a magnetic field is generated using the conducting wire 60.

  Specifically, referring to FIG. 11, the magnetic element 10d according to the present embodiment includes a case 20d, a coil 30d, and a magnetic core 40d.

  The case 20d includes a cylindrical portion 26d, an outer peripheral wall portion 22d, and a bottom portion that connects the cylindrical portion 26d and the outer peripheral wall portion 22d. The cylindrical portion 26d extends upward from the bottom portion and is located near the center of the bottom portion.

  The coil 30d is the same as the coil 30a according to the first embodiment. The coil 30d is disposed in the case 20d so that the cylindrical portion 26d is positioned inside (that is, the cylindrical portion 26d is surrounded in the radial direction by the coil 30d). In the present embodiment, in a state where the coil 30d is disposed in the case 20d, the axis of the coil 30d extends along the vertical direction and coincides with the axis of the cylindrical portion 26d.

  The magnetic core 40d is made of the same material as the magnetic core 40a according to the first embodiment. The magnetic core 40d is obtained by pouring the mixture into the case 20d in a state where the coil 30d is disposed in the case 20d as described above, and curing the mixture.

  In the present embodiment, electricity is passed through the conducting wire 60 in a state where the conducting wire 60 is wound around the case 20d so as to pass through the inside of the cylindrical portion 26d during the curing process or before the curing process. Thus, a magnetic field that circulates around the axis of the coil 30d is generated, and the magnetic powder is oriented and aligned by the magnetic field. In the magnetic core 40d of the magnetic element 10d thus manufactured, the magnetic permeability in the circumferential direction (direction in which the coil 30d is wound) and the permeability in the direction orthogonal to the circumferential direction are different by 5% or more. For this reason, the magnetic element 10d can exhibit good direct current superposition characteristics.

  If the conducting wire 60 has only one turn, a leakage magnetic flux is generated, and there is a possibility that a magnetic field that circulates over the entire circumference cannot be created. Therefore, it is preferable that the conducting wire 60 is wound around the case 20d by two turns or more. From this point of view, in the present embodiment, eight turns are wound around the case 20d.

  In addition to the structural feature that the magnetic element 10d manufactured by the manufacturing method according to the present embodiment includes the cylindrical portion 26d penetrating the case 20d in the vertical direction, as described above, it has excellent direct current superposition characteristics. have. Therefore, the magnetic element 10d is suitable for applications in which a large current flows, as in the first embodiment.

  In the first to fourth embodiments described above, the cases 20a to 20d of the magnetic elements 10a to 10d and the container (mold) for casting the mixture have been described. It is not limited to. For example, after pouring the mixture into the container (mold) in a state where the coil is placed in the releasable container (mold), the mixture is cured and extracted, and incorporated in a case different from the container (mold). It is good as well.

10a, 10b, 10c, 10d Magnetic element 20a, 20b, 20c, 20d Case (container: mold)
22a, 22b, 22c, 22d Outer peripheral wall portions 24a, 24b, 24c Bottom portions 26a, 26b Current-carrying members 26c Current-carrying member housing portions 26d Tube portions 30a, 30b, 30c, 30d Coils 40a, 40b, 40c, 40d Magnetic core (mixture)
50 Current-carrying member 60 Conductor

Claims (12)

A casting step of pouring a mixture of magnetic powder and resin into the container with the coil disposed in the container;
A curing step of curing the mixture to form a magnetic core while at least temporarily energizing or after energizing an electrical path including a section that passes through the inside of the coil and is parallel to the axis of the coil. A method for manufacturing a magnetic element comprising: A method of manufacturing a magnetic element according to claim 1,
The container is made of a conductive material, and has an outer peripheral wall portion, a bottom portion that closes a lower end of the outer peripheral wall portion, and an energization member that extends upward from the bottom portion,
In the casting step, the coil is disposed in the container so that the energizing member is located inside the coil, and the mixture is poured into the container,
A method of manufacturing a magnetic element that, in the curing step, forms the electric path by connecting the energizing member and the outer peripheral wall part by means other than the bottom part, and energizes the electric path. A method of manufacturing a magnetic element according to claim 1,
The container is made of a conductive material, and has an outer peripheral wall portion and a bottom portion that closes a lower end of the outer peripheral wall portion,
In the casting step, the coil is placed in the container so that the current-carrying member is located inside the coil in a state where the current-carrying member is disposed in the container so as to contact the bottom and extend upward. And pouring the mixture into the container,
In the curing step, a method of manufacturing a magnetic element that energizes the electrical path after the electrical path is configured by connecting the current-carrying member and the outer peripheral wall of the container by means other than the bottom. A manufacturing method according to claim 2 or claim 3, wherein
In the curing step, a method of manufacturing a magnetic element in which the current-carrying member and the outer peripheral wall portion are connected in parallel at two or more locations to energize the electrical path. A method of manufacturing a magnetic element according to claim 1,
The container has a cylindrical energizing member accommodating portion, an outer peripheral wall portion, and a bottom portion connecting the energizing member accommodating portion and the outer peripheral wall portion,
In the casting step, the coil is arranged in the container so that the energizing member accommodating portion is located inside the coil, and the mixture is poured into the container,
A method of manufacturing a magnetic element, wherein, in the curing step, an energization member is inserted into the energization member housing and the energization member is energized. A method of manufacturing a magnetic element according to claim 1,
The container has a cylindrical part, an outer peripheral wall part, and a bottom part connecting the cylindrical part and the outer peripheral wall part,
In the casting step, the coil is disposed in the container so that the cylindrical portion is located inside the coil, and the mixture is poured into the container.
In the curing step, a method of manufacturing a magnetic element that energizes the conducting wire in a state in which the conducting wire is wound around the container so as to pass inside the cylindrical portion. A method of manufacturing a magnetic element according to claim 6,
In the curing step, the conductive wire is wound around the container for two or more turns. A case made of a conductive material, comprising an outer peripheral wall portion, a bottom portion that closes a lower end of the outer peripheral wall portion, and a current-carrying member that extends upward from the bottom portion;
A coil disposed in the case so as to surround the energizing member;
A section passing through the inside of the coil in a state where the mixture of magnetic powder and resin is poured into the case and the coil is at least partially embedded in the mixture, and is parallel to the axis of the coil. A magnetic element comprising: a magnetic core formed by curing the mixture while at least temporarily energizing an electrical path including the current path . A case made of a conductive material, and a case having an outer peripheral wall portion and a bottom portion closing the lower end of the outer peripheral wall portion;
An energization member disposed in the case so as to be in contact with the bottom and extending upward from the bottom;
A coil disposed in the case so as to surround the energizing member;
A section passing through the inside of the coil in a state where the mixture of magnetic powder and resin is poured into the case and the coil is at least partially embedded in the mixture, and is parallel to the axis of the coil. A magnetic element comprising: a magnetic core formed by curing the mixture while at least temporarily energizing an electrical path including the current path . A case having a cylindrical energizing member accommodating portion, an outer peripheral wall portion, and a bottom portion connecting the energizing member accommodating portion and the outer peripheral wall portion;
A coil disposed in the case so as to surround the energizing member accommodating portion;
A section passing through the inside of the coil in a state where the mixture of magnetic powder and resin is poured into the case and the coil is at least partially embedded in the mixture, and is parallel to the axis of the coil. A magnetic element comprising: a magnetic core formed by curing the mixture while at least temporarily energizing an electrical path including the current path . A case having a cylindrical portion, an outer peripheral wall portion, and a bottom portion connecting the cylindrical portion and the outer peripheral wall portion;
A coil disposed in the case so as to surround the cylindrical portion;
A section passing through the inside of the coil in a state where the mixture of magnetic powder and resin is poured into the case and the coil is at least partially embedded in the mixture, and is parallel to the axis of the coil. A magnetic element comprising: a magnetic core formed by curing the mixture while at least temporarily energizing an electrical path including the current path . A magnetic element according to any one of claims 8 to 11,
In the magnetic core, the magnetic permeability in the circumferential direction, which is the direction in which the coil is wound, differs from the magnetic permeability in the direction perpendicular to the circumferential direction by 5% or more.

Images