JPH07220932A - Coil element and its module - Google Patents

Abstract

PURPOSE:To obtain a coil element equivalent to a coil element having a winding wound around a magnetic material by winding a magnetic material around conductor, and its module. CONSTITUTION:A magnetic coil 3 is produced in such a manner that the start and end of wound portions 4a and 4b each consisting of a ferrite wound by one or more turn are coupled with coupling portions 5 so as to make a closed magnetic path. And conductors 6a and 6b are arranged through the wound portions 4a and 4b. Here, if a load is connected to the coil element so as to apply a current to the conductors 6a and 6b in the arrow direction, then noise transmitted through the conductors 6a and 6b is absorbed by the wound portions and the common mode noise is attenuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil element for obtaining a predetermined inductance value and its module, and more particularly to a coil element formed by winding a magnetic material around a wire and its module structure.

[0002]

2. Description of the Related Art FIG. 11 is an explanatory view showing a common mode choke coil which is a conventional coil element. (A) is a plan view thereof, (b) is a side view thereof, and (c) is an equivalent circuit thereof. ing. This common mode choke coil is constructed by winding a winding 2 made of a metal lead wire around a ferrite core 1 which is a magnetic body in a predetermined number of turns, and an inductance value according to the number of turns of the winding 2 is obtained. . The conventional common mode choke coil configured in this way is
It is used as a countermeasure for EMI, for example, by utilizing the electromagnetic characteristics of the coil. That is, if this common mode choke coil is inserted into, for example, a signal line of a device, conductive noise generated in the signal line is absorbed by the electromagnetic characteristics of the coil, and the noise can be attenuated.

[0003]

Since the conventional common mode choke coil is constructed by winding the winding wire 2 around the ferrite core 1 many times as described above, when the diameter of the winding wire 2 is large (for example, , 1.5 mmφ or more), it becomes difficult to wind the winding 2, and the length of the winding 2 becomes long, which makes manufacturing difficult and increases the cost. Further, by winding the winding 2 a large number of times, the stray capacitance between the wires is increased, and further, the temperature is increased due to heat generation due to copper loss, which causes a problem that characteristics are deteriorated.

The present invention has been made in order to solve the above problems, and the number of windings of the wire is increased by forming the magnetic material in a spiral shape and penetrating the wire into the spiral magnetic material. Can be manufactured easily and at low cost,
Another object of the present invention is to obtain a coil element and its module capable of suppressing characteristic deterioration due to heat generation due to line stray capacitance and copper loss.

[0005]

SUMMARY OF THE INVENTION A coil element according to the present invention has a winding part made of a magnetic material formed by winding at least one turn and a magnetic part for connecting a winding start and a winding end of the winding part. The magnetic coil includes a connecting portion made of a material, and a conductor penetrating the winding portion.

Further, the winding portion is formed by spirally winding a sheet of magnetic material.

Further, it is composed of a pair of winding parts made of a magnetic material formed by winding at least one turn or more, and a connecting part made of a magnetic material for connecting the winding start and winding end of the pair of winding parts. The magnetic coil and the conductor provided so as to penetrate through the pair of winding portions, respectively, the magnetic coil has a direction of magnetic flux induced in the pair of winding portions when a current is applied to the conductor. The winding start and winding end of the pair of winding portions are connected by a connecting portion so as to be opposite to each other.

Further, the winding portion is formed by spirally winding a sheet of magnetic material.

Further, the coil element module according to the present invention comprises a winding portion made of a magnetic material formed by winding at least one turn and a magnetic material connecting the winding start and winding end of the winding portion. A magnetic coil composed of a connecting portion, a conductor penetrating the winding portion,
It is provided with a mold resin for molding the magnetic coil and the conductor, and a terminal having one end connected to the conductor and the other end protruding from the mold resin.

In the coil element module according to the present invention, a pair of winding portions made of a magnetic material formed by winding at least one turn or more and a winding magnetic end of the pair of winding portions are closed magnetic paths. A magnetic coil composed of a connecting portion made of a magnetic material that is connected to form
A conductor provided to penetrate through the pair of winding parts, a mold resin for molding the magnetic coil and the conductor, and a terminal provided with one end connected to the conductor and the other end protruding from the mold resin. Be prepared.

[0011]

In the present invention, the magnetic coil forms a closed magnetic circuit by connecting the winding start and winding end of the winding portion formed by winding at least one turn or more by the connecting portion. Therefore, if an electric current is passed through a conductor that penetrates the wound portion, the induced magnetic flux flows in the magnetic coil,
The leakage magnetic flux is extremely small. Then, the coil element configured as described above acts equivalently to a conventional normal mode choke coil formed by winding a magnetic material around a conductor. Therefore, the conduction noise of the current flowing through the conductor, that is, the high frequency component is absorbed by the magnetic coil.

Further, since the magnetic material sheet is spirally wound to form the winding portion, it is easy to increase the number of windings due to the increase of the inductance value.

In the magnetic coil, the winding start and winding end of the pair of winding portions are set so that the directions of the magnetic fluxes induced in the pair of winding portions are opposite to each other when a current is applied to the conductor. And are connected by a connecting portion to form a closed magnetic circuit. Therefore, when the conductor is energized, the induced magnetic flux flows in the magnetic coil. The coil element configured as described above acts equivalently to a conventional common mode choke coil or transformer in which a pair of conductors are wound around an annular magnetic body. Therefore, the conduction noise of the current flowing through the conductor is absorbed by the magnetic coil. Alternatively, an electromotive force corresponding to the winding number ratio of the pair of winding portions is induced in the other conductor.

Further, since the magnetic material sheet is spirally wound to form the winding portion, it is easy to increase the number of windings due to the increase of the inductance value.

Also, since the conductor and the magnetic coil are integrally molded with the molding resin, the coil element module can be easily obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. Example 1. 1A and 1B are explanatory views showing a coil element according to a first embodiment of the present invention. FIG. 1A is its plan view, FIG. 1B is its side view, and FIG. 1C is its equivalent circuit. In the figure, reference numeral 3 denotes a magnetic coil made of ferrite. The magnetic coil 3 has a pair of spirally wound winding portions 4a and 4b which are connected to each other by a connecting portion 5 to close a magnetic field. Is configured to form a passage. Reference numerals 6a and 6b denote conductors arranged so as to penetrate through the pair of winding portions 4a and 4b, respectively.

In order to assemble the coil element thus constructed, ferrite is first press-molded to produce a large number of thin plate block pieces. Next, the block pieces are combined in a spiral shape and sintered and integrated to form spirally wound parts 4a and 4b. Similarly, an elongated connecting portion 5 made of ferrite is produced. And
The magnetic coil 3 is manufactured by welding the connecting portion 5 to the ends of the winding portions 4a and 4b so as to form a closed magnetic circuit. At this time, the winding portions 4a and 4b are wound in directions opposite to each other, and when a current is applied to the pair of conductors 6a and 6b, the directions of magnetic fluxes induced in the winding portions 4a and 4b are opposite to each other. It is supposed to be. Then, the winding portion 4a,
A pair of conductors 6a and 6b so as to penetrate through each of 4b.
And the coil element is assembled.

The coil element assembled in this way is
The equivalent circuit shown in FIG. 1 (c) is equivalent to the equivalent circuit of the conventional common mode choke coil shown in FIG. 11 (c). Then, when the coil element was manufactured by changing the number of turns of the winding portions 4a and 4b, an inductance value substantially equal to that of the conventional common mode choke coil having the same number of turns was obtained.

Next, the operation of the coil element according to the first embodiment will be described. In this coil element, as indicated by an arrow in (a) of FIG. 1, a current flows through the conductor 6a downward in the drawing, so that a current flows through the conductor 6b upward through the load,
Insert into the signal line of the device. At this time, the magnetic flux induced in the winding portions 4a and 4b by the current flowing through the conductors 6a and 6b is
It passes through the magnetic coil 3 that is configured as a closed magnetic circuit. And
The noise conducted through the conductors 6a and 6b is caused by the winding portions 4a and 4b.
The noise that is absorbed by and is generated in the signal line is attenuated.

As described above, according to the first embodiment, the ends of the pair of spirally wound winding portions 4a and 4b are connected to each other by the connecting portion 5 to form a magnetic closed magnetic path. The body coil 3 is formed, and the conductor 6a is formed on each of the winding portions 4a and 4b.
Since the coil element is formed by penetrating 6b, EM
When used as a countermeasure for I, it becomes equivalent to a conventional common mode choke coil, and a common mode noise attenuation effect can be obtained. Further, it is not necessary to wind the winding wire 2 around the ferrite core 1 unlike the conventional common mode choke coil. Therefore, the work of winding the conductors 6a and 6b with a large diameter is not necessary, and the lengths of the conductors 6a and 6b are shortened, the usage amount thereof is reduced, the productivity can be improved, and the cost can be reduced. Can be achieved. Also,
It is possible to suppress the temperature rise due to heat generation due to stray capacitance between lines and copper loss, which causes characteristic deterioration. Furthermore, there is no bulging of the coil due to winding the winding 2, and the thickness can be reduced.

Example 2. 2 is a view showing a coil element according to Embodiment 2 of the present invention, (a) is a plan view thereof,
(B) is the side view. In the first embodiment described above, the pair of winding portions 4a and 4b are connected by the connecting portion 5, and the magnetic coil 3 is formed.
And a conductor 6 is formed on each of the pair of winding portions 4a and 4b.
Although the coil element is formed by penetrating through a and 6b, in the second embodiment, the winding start and the winding end of one winding portion 4 are connected by the connecting portion 5 to form a magnetic coil. 3 is formed, and the pair of conductors 6a and 6b are arranged to pass through the winding portion 4 to form a coil element.

In the second embodiment, the above-mentioned first embodiment is used.
Similarly, first, ferrite is press-molded to prepare a large number of thin plate-shaped block pieces, and the block pieces are combined in a spiral shape to be sintered and integrated, and the spirally wound winding portion 4 is formed. To make. Similarly, an elongated connecting portion 5 made of ferrite is produced. Then, the winding start and the winding end of the winding portion 4 are welded and connected at the connecting portion 5 so as to form a closed magnetic path, thereby producing the magnetic coil 3 that forms a closed magnetic path. Further, a pair of conductors 6a and 6b are arranged so as to penetrate the winding portion 4 to manufacture a coil element.

The coil element produced in this manner is equivalent to the coil element of the first embodiment, and the pair of conductors 6a,
If 6b is inserted into the signal line so that a current flows as indicated by an arrow in FIG. 2, it acts as a common mode choke coil, absorbs noise conducted in the conductors 6a and 6b, and has an effect of attenuating common mode noise. can get. Also, the conductor 6
Since it is not necessary to wind a and 6b, the same effect as that of the first embodiment can be obtained.

Example 3. 3A and 3B are explanatory views showing a coil element according to Embodiment 3 of the present invention. FIG. 3A is its plan view, FIG. 3B is its side view, and FIG. 3C is its equivalent circuit. In the second embodiment, the winding start and the winding end of one winding portion 4 are connected by the connecting portion 5 to form the magnetic coil 3.
Although the pair of conductors 6a and 6b are arranged to pass through the winding portion 4 to form a coil element, in the third embodiment, the winding start and the winding end of one winding portion 4 are connected to each other. The magnetic body coil 3 is formed by connecting with 4 and one conductor 6 is arranged to pass through the winding portion 4 to form a coil element.

In Example 3, a resin containing a predetermined amount of ferrite powder is injection molded to form a spirally wound winding portion 4 and an elongated connecting portion 5. Then, the winding start and the winding end of the winding portion 4 are welded and connected at the connecting portion 5 so as to form a closed magnetic path, thereby producing the magnetic coil 3 that forms a closed magnetic path. Further, the conductor 6 is arranged so as to penetrate the winding portion 4, and the coil element is manufactured.

The coil element thus manufactured is shown in FIG.
The equivalent circuit shown in (c) is equivalent to the equivalent circuit of the conventional normal mode choke coil. Then, when the coil element was manufactured by changing the number of windings of the winding portion 4, the inductance value substantially equal to that of the conventional normal mode choke coil having the same number of windings was obtained.

Next, the operation of the coil element according to the third embodiment will be described. If this coil element is inserted into the signal line of the device, the magnetic flux induced in the winding portion 4 by the current flowing through the conductor 6 as shown by the arrow in FIG. It passes through the body coil 3. The noise conducted through the conductor 6 is absorbed by the winding portion 4, and the noise generated in the signal line is attenuated.

As described above, according to the third embodiment, the magnetic body is constructed so that the winding start and the winding end of the spirally wound winding portion 4 are connected by the connecting portion 5 to form a closed magnetic path. Since the coil 3 is formed and the coil element is configured by penetrating the conductor 6 through the winding portion 4, when used as a measure for EMI, it becomes equivalent to a conventional normal mode choke coil, and a common mode noise of A damping effect is obtained. Also,
Since it is not necessary to wind the conductor 6, the length of the conductor 6 is shortened, the usage amount thereof is reduced, and the cost can be reduced. Further, it is possible to suppress a temperature rise due to heat generation due to stray capacitance between lines and copper loss, which causes characteristic deterioration. Furthermore, there is no bulging of the coil due to winding the winding 2, and the thickness can be reduced. Furthermore, since the magnetic coil 3 is manufactured by injection molding, the coil element can be easily manufactured and the productivity can be improved.

Example 4. In the third embodiment, the conductor 6 is arranged so as to penetrate the winding portion 4 of the magnetic coil 3, but in the fourth embodiment, as shown in FIG.
Is wound around the wound portion 4 of the magnetic coil 3 so as to penetrate the wound portion 4 twice, and the same effect as that of the third embodiment is obtained. In this case, the conductor 6 is wound to form the winding portion 4 in two.
Since the coil element is penetrated once, an inductance value that is about four times that of the coil element of the third embodiment can be obtained.

Example 5. 5 is a perspective view showing a magnetic coil in a coil element according to a fifth embodiment of the present invention. In the figure, 7 is an annular body made of ferrite and having a partial cutout, 8 is a connecting piece made of ferrite that connects the annular bodies 7, and 9 is a spiral connecting piece 8 of a plurality of annular bodies 7. Is a winding part that is connected to
The winding start and the winding end are connected by the connecting portion 5 to form the magnetic coil 3.

In order to manufacture the magnetic coil 3 having such a structure, first, ferrite powder is press-molded to manufacture an annular molded body, which is then sintered. Then, a part of this molded body is cut out to form a C-shaped annular body 7. And
One side of the notched edge portion of one annular body 7 and the other annular body 7
A connecting piece 8 is welded to the other side of the cutout edge portion of, and a plurality of annular bodies 7 are sequentially connected by the connecting piece 8 in the same manner, and the annular body 7 is spirally connected by the connecting piece 8. The wound portion 9 is prepared. Further, the connecting portion 5 is welded and connected to the winding start and winding end of the winding portion 9 to produce the magnetic coil 3.

The magnetic coil 3 thus manufactured
If the conductor 6 is passed through the winding portion 9, a normal mode choke coil similar to that of the above-described third embodiment is obtained, and if the winding portion 9 is passed through the pair of conductors 6a and 6b, A common mode choke coil similar to that of the second embodiment is obtained, and further two winding parts 9 are connected by a connecting part 5 so as to form a closed magnetic circuit, and a conductor is passed through each of the winding parts 9. A common mode choke coil similar to that of the first embodiment can be obtained.

Embodiment 6 FIG. 6 is a plan view showing a coil element according to Embodiment 6 of the present invention. In the drawing, reference numeral 10 denotes a winding portion formed by spirally winding a sheet made of ferrite together with an insulating sheet 11, and the winding start and the winding end of the winding portion 10 are connected by a connecting portion 5 to form a magnetic coil. 3 is formed, and the conductor 6 is penetrated through the magnetic coil 3 to form a coil element.

According to the sixth embodiment, the winding start and the winding end of the spirally wound winding portion 10 are connected by the connecting portion 5 to form the magnetic coil 3, and the winding portion 10 is wound. Since the coil element is formed by penetrating the conductor 6 in the central portion,
The magnetic body coil 3 constitutes a closed magnetic circuit and acts as a normal mode choke coil as in the third embodiment, and a normal mode noise attenuation effect is obtained. Also, the conductor 6
Since it is not necessary to wind, it is possible to reduce the length of the conductor 6,
The same effect as that of the third embodiment can be obtained. In addition, since the sheet made of ferrite is spirally wound with the insulating sheet 11, a short circuit between layers of the sheet made of ferrite can be easily prevented, and the workability of manufacturing the wound portion 10 can be improved. Furthermore, the number of windings can be easily increased, and the magnetic coil 3 having a large inductance value can be easily manufactured.

In the sixth embodiment, the magnetic coil 3 is formed by connecting the winding start portion and the winding end portion of the winding portion 10 formed by spirally winding the sheet made of ferrite together with the insulating sheet 11 with the connecting portion 5. The coil element is formed by penetrating the conductor 6 through the central portion of the winding portion 10, but the winding start and winding end of the two winding portions 10 produced in the same manner are closed. Connecting part 5 to form a path
Alternatively, the magnetic coil 3 may be formed by connecting with each other, and a conductor may be passed through each of the center portions of the two winding portions 10 to form a coil element. In this case, a common mode choke coil similar to that of the above-described first embodiment can be obtained.

In Example 6, the sheet made of ferrite is spirally wound with the insulating sheet to form the winding portion 10. However, the insulating sheet 1
1 is not always necessary, and it is sufficient if the spirally wound winding portions 10 can be manufactured so as not to contact with each other between adjacent layers.

Example 7. In the first embodiment, the pair of winding portions 4a and 4b are wound with the same number of windings, but in the seventh embodiment, as shown in FIG. 7, the pair of winding portions 4a and 4b are wound. The number of windings is different. In Example 7, when a current is passed through the conductor 6a, the winding portion 4
An electromotive force corresponding to the winding number ratio of a and 4b is induced in the conductor 6b, and this coil element has an effect of a transformer. Further, since it is not necessary to wind the conductors 6a and 6b, the lengths of the conductors 6a and 6b are shortened, and the same effect as that of the first embodiment can be obtained.

Example 8. 8 is a plan view showing a coil element according to Embodiment 8 of the present invention. In this Example 8,
A plurality of magnetic coils 3 according to the first embodiment are arranged side by side, the conductor 6a penetrates each winding part 4a, and the conductor 6b penetrates each winding part 4b to form a coil element.

According to the eighth embodiment, in addition to the effect of the first embodiment, since a plurality of magnetic material coils 3 are arranged in parallel, a large inductance value can be obtained. Further, even if a plurality of magnetic coils 3 according to the third embodiment are arranged in parallel, the inductance value can be similarly increased.

Example 9. 9A and 9B are explanatory views showing a coil element module according to Embodiment 9 of the present invention, FIG. 9A is a plan view thereof, and FIG. 9B is a sectional view taken along line IXB-IXB thereof. In the figure, 12 is a terminal that constitutes both ends of the conductors 6a and 6b, and 13 is a molding resin that integrates the magnetic coil 3 and the conductors 6a and 6b.

The coil element module according to the ninth embodiment is constructed by resin-sealing the coil element according to the first embodiment with a mold resin 13 so that the terminals 12 forming both ends of the conductors 6a and 6b are exposed. Has been done.
Therefore, since it is not necessary to wind the conductors 6a and 6b, there is no bulge of the coil due to winding of the winding wire, the thickness can be reduced, and the module can be made thinner. It can be applied to parts.

Example 10. In the ninth embodiment, the coil element is configured in one stage, but this tenth embodiment
Then, as shown in FIG. 10, the coil element is configured in two stages, and the same effect is obtained. In this case, two magnetic coils 3 are arranged side by side, and the inductance value can be increased.

In the ninth and tenth embodiments, the coil element according to the first embodiment is modularized, but the coil elements according to the second to seventh embodiments have the same effect.

In each of the above embodiments, ferrite is used as the magnetic material. However, a soft magnetic material is preferable as the magnetic material, and in addition to ferrite, for example, cobalt or iron-based amorphous alloy, permalloy, or the like. Good.

[0045]

Since the present invention is constituted as described above, it has the following effects.

The coil element according to the present invention comprises a winding portion made of a magnetic material formed by winding at least one turn or more, and a connecting portion made of a magnetic material for connecting the winding start and winding end of the winding portion. A configured magnetic coil,
Since it has a conductor that penetrates the winding part,
For example, it is possible to obtain characteristics equivalent to those of a normal mode choke coil configured by winding a winding around a magnetic body. Further, since it is not necessary to wind the conductor, the length of the conductor can be shortened and the cost can be reduced. Further, the temperature rise due to the stray capacitance between the conductors and the heat generation due to copper loss is suppressed, and the characteristic deterioration can be prevented.

Furthermore, since the winding portion is formed by spirally winding a sheet of magnetic material, a coil element equivalent to a normal mode choke coil having a large inductance value can be easily manufactured.

Further, it comprises a pair of winding parts made of a magnetic material formed by winding at least one turn or more, and a connecting part made of a magnetic material for connecting the winding start and winding end of the pair of winding parts. The magnetic coil and the conductor provided so as to penetrate through the pair of winding portions, respectively, the magnetic coil has a direction of magnetic flux induced in the pair of winding portions when a current is applied to the conductor. Equivalent to a common mode choke coil or transformer configured by winding a winding on a magnetic material, because the winding start and winding end of a pair of winding parts are connected in opposite directions. The characteristics of can be obtained. Further, since it is not necessary to wind the conductor, the length of the conductor can be shortened and the cost can be reduced. Further, the temperature rise due to the stray capacitance between the conductors and the heat generation due to copper loss is suppressed, and the characteristic deterioration can be prevented.

Further, since the winding portion is formed by spirally winding a sheet of magnetic material, a coil element equivalent to a common mode choke coil or a transformer having a large inductance value can be easily manufactured. .

A magnetic coil having a winding portion made of a magnetic material formed by winding at least one turn or more and a connecting portion made of a magnetic material for connecting a winding start and a winding end of the winding portion. A conductor provided through the winding portion, a mold resin for molding the magnetic coil and the conductor, and a terminal having one end connected to the conductor and the other end protruding from the mold resin. Therefore, a coil element module applicable to thin surface mount components can be obtained.

Further, a pair of winding parts made of a magnetic material formed by winding at least one turn or more and a magnetic material connecting the winding start and winding end of the pair of winding parts so as to form a closed magnetic path. A magnetic coil composed of a connecting part made of, conductors respectively penetrating the pair of winding parts, a mold resin for molding the magnetic coil and the conductor, one end side connected to the conductor, and the other. Since the terminal side is provided with the terminal protruding from the mold resin, a coil element module applicable to a thin surface mount component can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a coil element according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a coil element according to a second embodiment of the invention.

FIG. 3 is an explanatory diagram showing a coil element according to Embodiment 3 of the present invention.

FIG. 4 is a plan view showing a coil element according to Embodiment 4 of the present invention.

FIG. 5 is a perspective view showing a magnetic coil in a coil element according to a fifth embodiment of the present invention.

FIG. 6 is a plan view showing a coil element according to Embodiment 6 of the present invention.

FIG. 7 is a plan view showing a coil element according to Embodiment 7 of the present invention.

FIG. 8 is a plan view showing a coil element according to Embodiment 8 of the present invention.

FIG. 9 is an explanatory view showing a coil element module according to Embodiment 9 of the present invention.

FIG. 10 is an explanatory view showing a coil element module according to Embodiment 10 of the present invention.

FIG. 11 is an explanatory diagram showing a conventional coil element.

[Explanation of symbols]

 3 Magnetic coil 4, 4a, 4b Winding part 5 Connecting part 6, 6a, 6b Conductor 9 Winding part 10 Winding part 12 Terminal 13 Mold resin

Claims (6)

[Claims] 1. A magnetic coil comprising a winding part made of a magnetic material formed by winding at least one turn or more and a connecting part made of a magnetic material for connecting a winding start and a winding end of the winding part. And a conductor provided so as to penetrate the winding portion. 2. The coil element according to claim 1, wherein the winding portion is formed by spirally winding a sheet of magnetic material. 3. A pair of winding parts made of a magnetic material formed by winding at least one turn or more, and a connecting part made of a magnetic material connecting a winding start and a winding end of the pair of winding parts. A magnetic coil and conductors penetrating through the pair of winding parts, respectively, and the magnetic coil is induced in the pair of winding parts when a current is applied to the conductor. A coil element, wherein a winding start and a winding end of the pair of winding portions are connected by the connecting portion so that directions of magnetic fluxes are opposite to each other. 4. The coil element according to claim 3, wherein the winding portion is formed by spirally winding a sheet of magnetic material. 5. A magnetic coil comprising a winding part made of a magnetic material formed by winding at least one turn or more, and a connecting part made of a magnetic material for connecting a winding start and a winding end of the winding part. A conductor penetrating the winding portion, a molding resin for molding the magnetic coil and the conductor, one end side connected to the conductor, and the other end side protruding from the molding resin. A coil element module, comprising: 6. A pair of winding portions made of a magnetic material formed by winding at least one turn or more, and a magnetic material connecting the winding start and winding end of the pair of winding portions so as to form a closed magnetic path. A magnetic coil composed of a connecting part made of, conductors respectively penetrating the pair of winding parts, a mold resin for molding the magnetic coil and the conductor, and one end of which is the conductor. A coil element module comprising: a terminal connected to the other end of the mold resin, the other end protruding from the mold resin.