KR101806443B1 - Inductor And Method Of Fabricating The Same - Google Patents

Abstract

The present invention provides a magnetic resonance imaging apparatus comprising: a first internal core comprising a first core and a first lower base, the first internal core being made of an insulating ferromagnetic material; A first upper base assembled on the upper surface of the first heartbeat and made of an insulating nonmagnetic material; A plurality of first terminal pins assembled on a lower surface of the first lower base; A first wire wound on the first core and having opposite ends connected to the plurality of first terminal pins; And an outer core surrounding the first core, the first upper base, and the first wire and being assembled to the first inner core, the outer core being made of an insulating ferromagnetic material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an inductor,

The present invention relates to an inductor and, more particularly, to an inductor in which a wire is directly wound on an inner core and a space between an inner core and an outer core is molded with an adhesive to simplify the structure, And a manufacturing method thereof.

Generally, an inductor is a passive element for a winding which is used as a filter for abrupt change of current in an electronic product, an oscillation circuit, a current storage element of a power supply circuit, or the like to filter electric noise. In recent years, The inductors mounted on the surface of the printed circuit board are also becoming smaller.

The conventional inductor is composed of an insulating base to which a terminal pin is assembled, a drum core in which a wire is wound, and a ring core that surrounds the drum core. The drum core is composed of an upper and a lower flange and a heart shape integrally formed with upper and lower flanges do.

In such a conventional inductor, it is necessary to use an insulating base in order to prevent electrical short-circuiting between the terminal pin and the drum core. However, the use of the insulating base increases the complexity of the inductor and increases material cost and manufacturing cost.

Further, there is a problem that the wire is damaged during the process of storing the wound wire or the winding of the wire wound around the drum core, or the wound wire is separated from the drum core and the ring core to generate noise.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a method of manufacturing a semiconductor device in which wire is directly wound on an inner core in which an upper base is assembled and a space between an inner core and an outer core is molded with an adhesive, And an object of the present invention is to provide a method of manufacturing the inductor.

The present invention provides an inductor in which the core and the lower base of the inner core are integrally formed of an insulative ferromagnetic material to improve the insulation strength and the terminal pin and the wire are connected at the bottom of the inner core to improve durability and a manufacturing method thereof For other purposes.

In order to solve the above problems, the present invention provides a magnetic resonance imaging apparatus comprising: a first internal core comprising a first core and a first lower base, the first internal core being made of an insulating ferromagnetic material; A first upper base assembled on the upper surface of the first heartbeat and made of an insulating nonmagnetic material; A plurality of first terminal pins assembled on a lower surface of the first lower base; A first wire wound on the first core and having opposite ends connected to the plurality of first terminal pins; And an outer core surrounding the first core, the first upper base, and the first wire and being assembled to the first inner core, the outer core being made of an insulating ferromagnetic material.

In addition, the inductor may further include an adhesive filling a space between the first inner core and the outer core.

In addition, the first inner core and the outer core may be made of Ni-based ferrite, and the first upper base may be made of liquid crystal plastic.

The plurality of first terminal pins may be downwardly attached to the lower surface of the first lower base so as to be disposed inside the first lower base.

A protrusion may be formed at the center of the upper surface of the outer core.

The first lower base includes a recess for guiding the first wire to the plurality of first terminal pins. The first upper base includes an alignment groove, and the outer core has an alignment corresponding to the groove And may include protrusions.

A first gap of the first upper base is larger than a second diameter of the first lower base, and a first gap, which is a left-right gap between the first lower base and the outer core, And the second gap, which is the upper gap between the first core and the outer core, may be determined by the thickness of the first upper base.

The inductor includes a second inner core, which is assembled to the outer core and includes a second core and a second lower base, and is made of an insulating ferromagnetic material; A second upper base assembled on the upper surface of the second heart core and made of an insulating nonmagnetic material; A plurality of second terminal pins assembled to the lower surface of the second lower base; And a second wire wound around the second core wire and having both ends connected to the plurality of second terminal pins, the outer core being connected to the first and second core wires, the first and second upper base , The first and second wires may be wrapped around the first and second inner cores.

According to another aspect of the present invention, there is provided a method of manufacturing a magnetic sensor, comprising: assembling a first upper base made of an insulating nonmagnetic material on a first core of a first inner core made of an insulative ferromagnetic material; Assembling a plurality of first terminal pins on a lower surface of a first lower base of the first inner core; Winding a first wire to the first core and connecting both ends of the first wire to the plurality of first terminal pins; And assembling an outer core made of an insulative ferromagnetic material to the first inner core so as to surround the first core, the first upper base, and the first wire.

The step of assembling the outer core into the first inner core includes the steps of inserting the first inner core into which the first upper base is assembled and the first wire is wound into the outer core; Filling the space between the first inner core and the outer core with an adhesive; And curing the adhesive.

The first upper base and the first crown are assembled through application and curing of an adhesive, and the first terminal pins and the first lower base are assembled through application and curing of an adhesive, The wires and the plurality of first terminal pins may be connected by soldering.

The present invention has the effect of simplifying the structure, preventing wire damage, and reducing noise by directly winding the wire on the inner core with the upper base assembled and molding the inner core with the wire wound on the outer core.

In addition, the present invention has an effect that the core and the lower base of the inner core are integrally formed of an insulative ferromagnetic material to improve the insulation force, and the terminal pin and the wire are connected at the lower portion of the inner core to improve the durability.

1 is a perspective view of an inductor according to a first embodiment of the present invention;
2 is an exploded perspective view of an inductor according to a first embodiment of the present invention;
3 is a cross-sectional view of an inductor according to a first embodiment of the present invention.
4A to 4E illustrate a method of manufacturing an inductor according to a first embodiment of the present invention.
5A and 5B illustrate first and second alignment means of an inductor according to a first embodiment of the present invention.
6 is an exploded perspective view of an inductor according to a second embodiment of the present invention.

Hereinafter, an inductor and a manufacturing method thereof according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of an inductor according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of an inductor according to a first embodiment of the present invention.

1 and 2, the inductor 10 according to the first embodiment of the present invention includes a plurality of terminal pins 20, a plurality of terminal pins 20, An inner core 30 including a base 34, an upper base 40 assembled on the crown 32 of the inner core 30, a wire 50 wound on the crown 32, a wire 50 And an outer core 60 wrapped around and assembled to the inner core 30.

The plurality of terminal pins 20 are connected to the wires 50 to supply electric current. For example, the terminal pins 20 may be formed in two corresponding to the lower center of the lower base 34.

The plurality of terminal pins 20 may have a shape of a bar having a circular or polygonal cross section. For example, the plurality of terminal pins 20 may be formed of a conductive metal material such as aluminum have.

The inner core 30 includes a columnar core 32 having a circular or polygonal cross section and a lower base 34 in the form of a polygonal plate. The core 32 and the lower base 34 are integrally formed of the same material Lt; / RTI >

The core 32 and the lower base 34 of the inner core 30 are formed of an insulative ferromagnetic material having a relatively high resistance in order to prevent electric shortage between the plurality of terminal pins 20 For example, the core 32 and the lower base 34 may be made of a nickel (Ni) -based ferrite such as a nickel-zinc (Ni-Zn) ferrite.

The core 32 serves to manage the magnetic flux of the wound wire 50 and to increase the inductance and the lower base 34 is connected to the wire wound around the core 32 with the outer core 60 50 to the outside and serves as an insulating base to which a plurality of terminal pins 20 are fixed.

The plurality of terminal pins 20 may be assembled to a lower central portion of the lower base 34 using an adhesive such as an epoxy and the lower base 34 may be assembled with wires 50 And two concave portions 36 for guiding the opposite ends of the terminal pins 20 to the plurality of terminal pins 20.

By thus forming the core 32 and the lower base 34 of the inner core 30 integrally with the insulating ferromagnetic material, the configuration of the inductor 10 can be simplified and the insulation can be improved.

The upper base 40 has a polygonal plate shape and is assembled on the crown 32. The upper base 40 can be assembled to the crown 32 using an adhesive such as epoxy.

In the first embodiment, the upper base 40 is a flat plate. However, in another embodiment, in order to increase the coupling force between the crown 32 and the upper base 40, A concave portion corresponding to the concave portion 32 may be formed.

The upper base 40 serves to guide the wire 50 to be wound on the crown 32. When the upper base 40 is formed of a ferromagnetic material, 34 and the upper base 40, the upper base 40 is made of an insulating non-magnetic material rather than a magnetic material.

For example, the upper base 40 may be made of an insulating non-magnetic material such as a liquid crystal polymer.

The wire 50 is wound directly on the core wire 32 and the both ends of the wire 50 are guided to the lower center of the lower base 34 through the recessed portion 36 of the lower base 34, The wire 50 may be connected to both end portions of the wire 50 by soldering and the wire 50 may be connected to the wire 50 by an insulating material such as enamel copper wire And can be made of lead wires.

As described above, by directly winding the wire 50 on the core 32 of the inner core 30, it is possible to prevent damage to the wires that may occur during the storage process or assembly process of the wound wire.

The outer core 60 serves to minimize the outflow of the magnetic flux of the wire 50 wound on the crown 32 along with the lower base 34 of the inner core 30, The wire 50 wound around the crown 32 is assembled to the lower base 34 while covering the top and sides of the crown 32, the upper base 40 and the wire 50, And is completely surrounded by the lower base 34 and the outer core 60.

Here, the outer core 60 is made of an insulating ferromagnetic material having a relatively high resistance in order to prevent electric shortage between the plurality of terminal pins 20 through the outer core 60 while preventing flux leakage For example, the outer core 60 may be made of a nickel (Ni) -based ferrite such as a nickel-zinc (Ni-Zn) ferrite.

The outer core 60 may have a hexahedron shape having an open bottom, and a protrusion 62 is formed at the center of the upper surface.

The protrusions 62 of the outer core 60 increase the sectional area of the outer core 60 to smooth the flow of the magnetic flux and increase the area of the outer surface of the outer core 60, The protrusion 62 may be formed in a polygonal shape in another embodiment, and the protrusion height of the protrusion 62 may be varied .

Although not shown, the protrusions 162 of the outer core 160 may be formed with straight grooves for alignment and heat dissipation.

The space between the inner core 30 and the outer core 60 in which the wire 50 is wound is filled with an adhesive such as epoxy (70 in FIG. 3) It is possible to reduce the noise caused by the collision of the vehicle.

3 is a cross-sectional view of an inductor according to a first embodiment of the present invention.

3, the lower base 34 and the outer core 60 of the inner core 30 are assembled to completely enclose the wire 50 wound on the crown 32, The magnetic field B generated as a result of applying the electric current to the outer core 60 is limited to a space formed by the assembled lower base 34 and the outer core 60 so that flux leakage to the outside is suppressed and minimized.

Therefore, the inductor 10 has a stable self-circulating structure, which improves the current characteristics, minimizes the interference to the peripheral elements of the inductor 10, and prevents generation of noise due to interference with the peripheral magnetic body.

Here, the distance between the inner core 30 and the outer core 60 can be accurately maintained by the diameter and the thickness of the upper base 40.

That is, the upper base 40 may have a first diameter d1 and a first thickness t1, and the lower base 34 of the inner core 30 may have a second diameter d2 And the first gap d1 between the lower base 34 of the inner core 30 and the outer core 60 by forming the first diameter d1 larger than the second diameter d2 (g1 = (d1 - d2) / 2) can be accurately maintained at a constant value that is 1/2 of the difference between the first and second diameters.

The second gap g2 between the core 32 of the inner core 30 and the outer core 60 can be accurately maintained at a constant value by the first thickness t1.

By controlling the diameter and the thickness of the insulating base nonmagnetic material of the upper base 40, it is possible to prevent the inner core 30 from deviating from the right or left or up and down in the inner space of the outer core 60, As a result, the inductance of the inductor 10 can be accurately realized and the current characteristic of the inductor 10 can be stably realized.

By forming the projecting portion 62 in the outer core 60, the magnetic flux generated in the wire 50 can smoothly flow and the heat generated in the wire 50 can be smoothly discharged.

The space between the assembled lower base 34 and the outer core 60 and the wound wire 50 is filled with the adhesive 70 so that the wound wire 50 and the lower base 34, The generation of noise due to the collision between the cores 60 is prevented.

4A to 4E are views showing a method of manufacturing the inductor according to the first embodiment of the present invention.

4A, the upper base 40 is assembled on the upper surface of the core 32 of the inner core 30, and a central portion of the upper base 40 is attached to the crown 32 using an adhesive such as epoxy And can cure the adhesive by heat or light.

The core 32 and the lower base 34 of the inner core 30 may be formed integrally with the insulating ferromagnetic material through a mold or the like and the upper base 40 may be formed of an insulating non- .

4B, a plurality of terminal pins 20 are assembled on the lower surface of the lower base 34 of the inner core 30. In order to assemble a plurality of terminal pins 20 on the lower surface of the lower base 34 using an adhesive such as epoxy, The fins 20 can be attached and the adhesive can be cured by heat or light.

At this time, the plurality of terminal pins 20 may be formed of a conductive metal material.

The plurality of terminal pins 20 are attached to the lower surface of the lower base 34 so as not to protrude out of the lower base 34 but to be disposed inside the lower base 34. Accordingly, It is possible to prevent the pin 20 from being damaged, and as a result, the durability of the inductor 10 is improved.

4C, the wire 50 is directly wound around the core 32 of the inner core 30 to wind the wire 50. Since the upper base 40 is assembled to the core 32, And the lower base 34 can guide the wire 50 to be wound on the crown 32 only.

Therefore, by winding the wire 50 on the core wire 32 by using the automatic winding machine, the manufacturing time can be shortened to improve the productivity and the wire can be prevented from being damaged during the storage process or the assembling process of the wound wire. can do.

Both ends of the wire 50 are bent and disposed in the recessed portion 36 of the lower base 34. The both ends of the wire 50 are bent and connected to each of the terminal pins 20, 50 can be cut at both ends.

Both ends of the wire 50 can be attached to the plurality of terminal pins 20 by soldering or the like.

The outer core 60 is assembled to the inner core 30 and the upper base 40 to which the wire 50 is wound, as shown in Fig. 4D.

At this time, first and second aligning means may be formed on the upper base 40 and the outer core 60, respectively, in order to align the plurality of terminal pins 20.

5A and 5B are views showing first and second alignment means of the inductor according to the first embodiment of the present invention.

5A and 5B, a first alignment means 42 such as an alignment groove is formed on one side of the upper base 40, and a first alignment means 42 such as an alignment protrusion is formed on one side of the inner surface of the outer core 60 The second alignment means 64 can be formed.

In this case, when the outer core 60 is assembled to the inner core 30 and the upper base 40 to which the wire 50 is wound, by arranging the first and second alignment means 42 and 64 to correspond to each other, The plurality of terminal pins 20 attached to the lower base 34 can be aligned to a desired position.

Meanwhile, in another embodiment, the plurality of terminal pins 20 may be aligned to a desired position by using the position correcting jig.

After the outer core 60 is assembled to the inner core 30 and the upper base 40, an adhesive such as epoxy is applied to the space between the outer core 60 and the inner core 30 Fill, cure adhesive by heat or light.

As described above, by molding the space between the outer core 60 and the inner core 30 with an adhesive, it is possible to prevent noise from being generated due to collision between the lower base 34 and the outer core 60.

In another embodiment, two or more internal cores may be assembled in one external core, which will be described with reference to the drawings.

6 is an exploded perspective view of the inductor according to the second embodiment of the present invention, and a description of the same parts as those of the first embodiment will be omitted.

6, the inductor 110 according to the second embodiment of the present invention includes a plurality of first terminal pins 120, a plurality of second terminal pins 122, a plurality of first terminal pins 120 are assembled and have a first inner core 130 including a first core 132 and a first lower base 134, a plurality of second terminal pins 122 assembled, a second core 172, A second inner core 170 including two lower bases 174, a first upper base 140 assembled on top of the first core 132 of the first inner core 130, A first wire 150 wound on the first core wire 132 and a second wire 190 wound on the second core wire 172. The second wire 180 is wound around the second core wire 172, And an outer core 160 surrounding the first and second wires 150 and 190 and assembled to the first and second inner cores 130 and 170.

The plurality of first terminal pins 120 are connected to the first wires 150 to supply current and the plurality of second terminal pins 122 are connected to the second wires 190 to supply current For example, a plurality of first terminal pins 120 are formed in correspondence with the center lower portion of the first lower base 134 and a plurality of second terminal pins 122 are formed in the second lower base 134 174, respectively.

The first inner core 130 includes a first crown 132 having a circular or polygonal cross section and a first lower base 134 in the form of a polygonal plate, A second crown 172 having a circular or polygonal columnar shape, and a second lower base 174 having a polygonal plate shape.

The first core member 132 and the first lower core 134 and the second core member 172 and the second lower base member 174 are integrally formed of an insulating ferromagnetic material such as Ni-Zn ferrite, ≪ / RTI >

The first crown 132 serves to manage the magnetic flux of the wound first wire 150 and to increase the inductance and the second crown 172 serves to control the magnetic flux of the wound second wire 190 The first and second lower bases 134 and 174 together with the outer core 160 serve to control the magnetic flux and increase the inductance of the first and second lower bases 132 and 172 And serves as an insulating base in which a plurality of first terminal pins 120 and a plurality of second terminal pins 122 are fixed respectively while minimizing the outflow of magnetic fluxes of the first and second wires 150 and 190 .

The plurality of first terminal pins 120 and the plurality of second terminal pins 122 are assembled to the lower portions of the first and second lower bases 134 and 174 using an adhesive such as an epoxy And the first and second lower bases 134 and 174 are respectively formed of two pieces of first and second wires 150 and 190 wound around the first and second core parts 132 and 172, And may include first and second recessed portions 136, 176.

The first core 132 and the first lower core 134 and the second core 172 of the first and second inner cores 130 and 170 and the second lower base 174 are made of an insulating ferromagnetic material By forming them integrally, the configuration of the inductor 110 can be simplified and the insulation can be improved.

The first and second upper bases 140 and 180 have a polygonal plate shape and are assembled on top of the first and second heart plates 132 and 172. For example, The first and second heart beats 132 and 172, respectively.

The first and second upper bases 140 and 180 serve to guide the first and second wires 150 and 190 to be wound on the first and second cusps 132 and 172, The first and second upper bases 140 and 180 may be made of an insulating nonmagnetic material such as a liquid crystal polymer.

The first and second wires 150 and 190 are directly wound on the first and second core rings 132 and 172 and the opposite ends of the first wire 150 are connected to the first recessed portion 132 of the first lower base 134, And the second ends of the second wires 190 are connected to the first terminal pins 120 of the first lower base 134 through the first and second terminal bosses 136, And is guided to the lower center of the second lower base 174 through the second recessed portion 176 and connected to the plurality of second terminal pins 122, respectively.

Thus, by winding the first and second wires 150 and 190 directly on the first and second core rings 132 and 172 of the first and second inner cores 130 and 170, It is possible to prevent wire damage which may occur in the process or assembly process.

The outer core 160 includes first and second lower bases 134 and 174 of the first and second inner cores 130 and 170 and first and second lower bases 134 and 174 of the first and second inner cores 130 and 170, The outer core 160 serves to minimize the magnetic flux of the second wires 150 and 190 to the outside while the first and second cusps 132 and 172 and the first and second upper bases 140 and 140, 180 and the upper and lower surfaces of the first and second wires 150 and 190 are wrapped around the first and second lower bases 134 and 174 so that the first and second cords 132 and 172 The respective first and second wires 150 and 190 wound respectively are wound around the first and second inner bases 130 and 170 and the outer core 160 completely surrounded by the first and second lower bases 134 and 174 of the first and second inner cores 130 and 170 All.

Here, the outer core 160 may be formed of an insulating ferromagnetic material such as nickel-zinc (Ni-Zn) ferrite.

The outer core 160 may have a hexahedron shape having an open bottom, and a protrusion 162 is formed at the center of the upper surface.

The protrusion 162 of the outer core 160 increases the sectional area of the outer core 160 to smooth the flow of the magnetic flux and increases the area of the outer surface of the outer core 160, And 190 to be discharged smoothly.

Although not shown, the second protrusions 262 of the upper core 260 may be formed with straight grooves for alignment and heat radiation.

The space between the first and second inner cores 130 and 170, in which the first and second wires 150 and 190 are wound, and the outer core 160 are filled with an adhesive such as epoxy and molded, The noise caused by the collision of the second inner core 130, 170 and the outer core 160 can be reduced.

As described above, in the inductor 110 according to the second embodiment of the present invention, the one outer core 160 includes the first and second inner cores 130 and 170, the first and second upper bases 140 and 180 ), And the first and second wires 150 and 190 are wrapped around, the material cost can be reduced and the size of the inductor 110 can be reduced to further facilitate the circuit configuration.

At this time, the first and second wires 150 and 190 may operate as two independent inductors.

In another embodiment, one outer core 160 may surround three or more inner cores, three or more upper bases, and three or more wires.

As described above, in the inductor according to the embodiment of the present invention, the wire is directly wound on the inner core in which the upper base is assembled, and the inner core in which the wire is wound is molded in the outer core, And the noise is reduced.

By forming the core and the lower base of the inner core integrally with the insulative ferromagnetic material, the insulation ability of the inductor is improved.

In addition, by connecting the terminal pin and the wire under the inner core so that the terminal pin is disposed in the inner core without protruding out of the inner core, the damage of the terminal pin is prevented and the durability of the inductor is improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

10: inductor 20: terminal pin
30: inner core 32:
34: lower base 40: upper base
50: wire 60: outer core

Claims (11)

A first inner core comprising a first core and a first lower base and made of an insulating ferromagnetic material;
A first upper base assembled on the upper surface of the first heartbeat and made of an insulating nonmagnetic material;
A plurality of first terminal pins assembled on a lower surface of the first lower base;
A first wire wound on the first core and having opposite ends connected to the plurality of first terminal pins;
An outer core made of an insulative ferromagnetic material, which surrounds the first core, the first upper base, and the first wire and is assembled to the first inner core,
Lt; / RTI >
Wherein the first diameter of the first upper base is larger than the second diameter of the first lower base.
A first inner core comprising a first core and a first lower base and made of an insulating ferromagnetic material;
A first upper base assembled on the upper surface of the first heartbeat and made of an insulating nonmagnetic material;
A plurality of first terminal pins assembled on a lower surface of the first lower base;
A first wire wound on the first core and having opposite ends connected to the plurality of first terminal pins;
An outer core surrounding the first core, the first upper base, and the first wire and being assembled to the first inner core, the outer core being made of an insulating ferromagnetic material;
An adhesive that fills a space between the first inner core and the outer core
Lt; / RTI >
The lower end of the side wall of the outer core is disposed below the first lower base,
Wherein the adhesive contacts the back surface of the first lower base and the inner surface of the outer core while filling the space between the back surface of the first lower base and the outer core.
The method according to claim 1,
Wherein the first inner core and the outer core are made of nickel (Ni) -based ferrite, and the first upper base is made of liquid crystal plastic.
The method according to claim 1,
And the plurality of first terminal pins are attached downward on a lower surface of the first lower base so as to be disposed inside the first lower base.
A first inner core comprising a first core and a first lower base and made of an insulating ferromagnetic material;
A first upper base assembled on the upper surface of the first heartbeat and made of an insulating nonmagnetic material;
A plurality of first terminal pins assembled on a lower surface of the first lower base;
A first wire wound on the first core and having opposite ends connected to the plurality of first terminal pins;
An outer core made of an insulative ferromagnetic material, which surrounds the first core, the first upper base, and the first wire and is assembled to the first inner core,
Lt; / RTI >
And a protrusion is formed in a central portion of an upper surface of the outer core.
The method according to claim 1,
Wherein the first lower base includes a recessed portion for guiding the first wire to the plurality of first terminal pins,
Wherein the first upper base includes an alignment groove, and the outer core includes an alignment protrusion corresponding to the alignment groove.
The method according to claim 1,
The first gap being a left-right gap between the first lower base and the outer core is determined as a half of a difference between the first and second diameters,
And the second gap, which is the upper gap between the first core and the outer core, is determined by the thickness of the first upper base.
The method according to claim 1,
A second inner core, which is assembled to the outer core and includes a second core and a second lower base, and is made of an insulating ferromagnetic material;
A second upper base assembled on the upper surface of the second heart core and made of an insulating nonmagnetic material;
A plurality of second terminal pins assembled to the lower surface of the second lower base;
A second wire wound around the second core wire and having opposite ends connected to the plurality of second terminal pins,
Further comprising:
Wherein the outer core surrounds the first and second core, the first and second upper base, the first and second wires, and is assembled to the first and second inner cores.
Assembling a first upper base made of an insulating nonmagnetic material on an upper surface of a first core of a first inner core made of an insulative ferromagnetic material;
Assembling a plurality of first terminal pins on the lower surface of the first lower base of the first inner core;
Winding a first wire directly to the first core of the first inner core to which the first upper base is coupled and connecting both ends of the first wire to the plurality of first terminal pins;
Assembling an outer core made of an insulative ferromagnetic material to the first inner core so as to surround the first core, the first upper base and the first wire;
Wherein the inductor is made of a metal.
10. The method of claim 9,
The step of assembling the outer core to the first inner core comprises:
Inserting the first inner core into which the first upper base is assembled and the first wire is wound into the outer core;
Filling the space between the first inner core and the outer core with an adhesive;
Curing the adhesive
Wherein the inductor is made of a metal.
10. The method of claim 9,
The first upper base and the first core are assembled through application and curing of an adhesive,
The plurality of first terminal pins and the first lower base are assembled through application and curing of an adhesive,
Wherein the first wire and the plurality of first terminal pins are connected through soldering.

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