JP7043272B2 - Inductor element - Google Patents

Description

The present invention relates to an inductor element.

There is an inductor element including a conductor and a core around which the conductor is wound. An example of such an inductor element is disclosed in Patent Document 1.

Japanese Unexamined Patent Publication No. 2015-015470

In such an inductor element, AC loss may occur and the inductor efficiency may deteriorate.

As a specific example of such an inductor element, there is an inductor element 90 shown in FIGS. 12 and 13. The inductor element 90 includes E-shaped core members 91 and 92 and a conductor 94. The E-shaped core members 91 and 92 include side legs 91a and 92a, side legs 91b and 92b, and central legs 91c (not shown) and 92c, respectively. The E-shaped core members 91 and 92 are arranged so that the tips of the side legs 91a and 91b and the center leg 91c and the tips of the side legs 92a and 92b and the center leg 92c face each other. The conductor 94 is wound around at least a part of the central legs 91c and 92c. Here, the gap space between the side legs 91a and the side legs 92a extends in the thickness direction of the conductor 94 (here, in the x-axis direction). Further, the gap space between the side legs 91b and the side legs 92b extends in the thickness direction of the conductor 94 (here, in the x-axis direction). Since leakage flux is generated in these gap spaces, eddy currents are generated on the surface of the conductor 94. This could result in AC loss.

The present invention is intended to suppress the occurrence of AC loss.

The inductor element according to the present invention is
A conductor with a conductor body and
The core body around which the conductor body is wound and the core body
With a first core member,
Between the core body and the first core member, there is a gap space extending in the width direction of the conductor body.
The core body comprises a groove for accommodating the conductor body.
The groove includes a first groove portion arranged on a facing surface of the core body facing the first core member.
The conductor body comprises a first groove accommodating portion.
The entire first groove accommodating portion is accommodated in the first groove accommodating portion.

According to such a configuration, although the leakage flux is generated from the gap space between the core body and the first core member, it is difficult to hit the surface of the first groove accommodating portion of the conductor body. Therefore, it is possible to suppress the generation of eddy currents on the surface of the first groove accommodating portion of the conductor body and suppress the generation of AC loss.

In addition, a second core member is further provided.
The core body is arranged between the first core member and the second core member.
Between the core body and the second core member, there is a gap space extending in the width direction of the conductor body, and the groove is formed on the facing surface of the core body facing the second core member. A second groove portion is further provided, the conductor body further comprises a second groove accommodating portion, and the entire second groove accommodating portion is accommodated in the second groove accommodating portion. May be good.
Further, the groove may be characterized by accommodating the entire conductor body.

According to such a configuration, the leakage flux generated from the gap space between the core body and the first core member and the gap space between the core body and the second core member, respectively, is generated. It is more difficult to hit the surface of the first groove accommodating portion of the conductor body and the surface of the second groove accommodating portion. Therefore, the occurrence of AC loss can be further suppressed.

Further, the entire first core member may be spaced from the groove at a predetermined distance, and the entire second core member may be spaced from the groove at a predetermined distance.

According to such a configuration, since the first core member and the entire second core member are located outside the groove, the first and second core members do not enter the inside of the groove. That is, the occurrence of AC loss due to the first and second core members entering the inside of the groove is suppressed. Therefore, the occurrence of AC loss can be further suppressed.

Further, the size of the distance between the core body and the first core member may be different from the size of the distance between the core body and the second core member.

According to such a configuration, the DC superimposition characteristic of the inductor element can take the value of the inductance in a plurality of stages according to the value of the DC current.

The first and second core members may be characterized in that they are mechanically connected and integrated via a connecting portion.

According to such a configuration, the DC superimposition characteristics with the first and second core members are hard to change and are stable. In addition, the number of manufacturing processes is small, which is preferable.

The present invention can suppress the occurrence of AC loss.

It is a perspective view of the inductor element which concerns on Embodiment 1. FIG. It is sectional drawing of the inductor element which concerns on Embodiment 1. FIG. It is a perspective view of the main part of the inductor element which concerns on Embodiment 1. FIG. It is an enlarged perspective view of the inductor element which concerns on Embodiment 1. FIG. It is a perspective view of the inductor element which concerns on Embodiment 2. FIG. It is a transmission perspective view of the inductor element which concerns on Embodiment 2. FIG. It is sectional drawing of the inductor element which concerns on Embodiment 2. FIG. It is a graph which shows the direct current superimposition characteristic. It is a graph which shows the AC loss of Example 1. FIG. It is a graph which shows the direct current superimposition characteristic. It is sectional drawing of an example of the inductor element which concerns on Embodiment 1. FIG. It is a perspective view of the inductor element of the related technology. It is sectional drawing of the inductor element of the related technology.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are appropriately simplified. In FIGS. 1 to 7 and 11, a three-dimensional xyz Cartesian coordinate system is defined.

(Embodiment 1)
The inductor element according to the first embodiment will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, the inductor element 10 includes a core body 1, a first core member 2, a second core member 3, and a conductor 4.

The core body 1 is made of a magnetic material. As such a magnetic material, for example, a magnetic material such as a ferrite core, a powder magnetic core obtained by powder forming a metallic magnetic powder, or a laminated steel plate can be used.

An example of the core body 1 shown in FIGS. 1 to 3 includes a groove 1 g that accommodates at least a part of the conductor 4, and the conductor 4 must protrude from the opening of the groove 1 g to the outside of the core body 1. good. The depth of the groove 1g is preferably equal to or greater than the thickness of the conductor 4, and is preferably larger than the thickness of the conductor 4.

An example of the core main body 1 shown in FIGS. 1 to 3 has a rectangular parallelepiped shape and includes a top surface 1a, a front surface 1b, a back surface 1c, a right side surface 1d, a left side surface 1e, and a bottom surface 1f on a paper surface. In this example, the groove 1g is provided so as to extend on the upper surface 1a, the front surface 1b, and the back surface 1c. For convenience of explanation, the upper surface 1a, the front surface 1b, the back surface 1c, the right side surface 1d, the left side surface 1e, and the bottom surface 1f are named to specify the direction, but the upper surface of the core body 1 is the upper surface. It should be noted that 1a and the like face a direction different from the direction related to the name of the portion depending on the posture of the inductor element 10. The groove 1g includes an upper surface groove portion 1ga arranged on the upper surface 1a, a first groove portion 1gb arranged on the front surface 1b, and a second groove portion 1gc arranged on the back surface 1c. The first groove portion 1 gb, the upper surface groove portion 1 ga, and the second groove portion 1 gc are continuous in this order.

Referring to FIGS. 1 and 2, the first core member 2 is a plate-shaped body having a groove 2a, and the second core member 3 is a plate-shaped body having a groove 3a. As shown in FIG. 4, the depth of the groove 2a is preferably equal to or greater than the thickness t1 of the conductor 4. The width of the groove 2a is preferably equal to or larger than the width W1 of the conductor 4. Similarly, the depth of the groove 3a is preferably equal to or greater than the thickness t1 of the conductor 4. The width of the groove 3a is preferably equal to or larger than the width W1 of the conductor 4. The first core member 2 and the second core member 3 are made of a magnetic material as in the core body 1.

Referring to FIG. 2 again, the entire first core member 2 is spaced from the first groove portion 1gb of the groove 1g of the core body 1 at a predetermined distance, and the entire second core member 3 is formed of the core body 1. It is preferable to leave a predetermined distance from the second groove portion 1gc of the groove 1g. The first core member 2 has a predetermined interval D1 from the core body 1, and the second core member 3 has a predetermined interval D2 from the core body 1. The interval D1 and the interval D2 may be the same size, or one may be larger than the other. When one of the interval D1 and the interval D2 is larger than the other, the DC superimposition characteristic of the inductor element 10 can take the value of the inductance L in a plurality of stages according to the value of the DC current ldc. Referring to FIG. 1 again, the core body 1 is arranged between the first core member 2 and the second core member 3. Of the main surfaces 2b and 2c of the first core member 2, the main surface 2b faces the front surface 1b of the core main body 1, and the main surface 2c faces the opposite side of the main surface 2b. Of the main surfaces 3b and 3c of the second core member 3, the main surface 3b faces the back surface 1c of the core main body 1, and the main surface 3c faces the opposite side of the main surface 3b. There is a gap space between the first core member 2 and the core main body 1 and between the second core member 3 and the core main body 1, respectively. These gap spaces may be filled with a member made of a non-magnetic and non-metallic material. By this filling, a member made of a non-magnetic and non-metallic material is interposed in the gap space between the second core member 3 and the core body 1 and the gap space between the first core member 2 and the core body 1. do. Therefore, it becomes difficult for the second core member 3 and the core main body 1 to come into contact with each other, and the gap space between the second core member 3 and the core main body 1 and the first. The gap space between the core member 2 and the core body 1 can be easily secured. Examples of such non-magnetic and non-metallic materials include adhesives and resins. This resin may be mixed with a filler.

Referring to FIG. 2 again, the conductor 4 includes a conductor body 41 and ends 42, 43 connected to the conductor body 41. The conductor 4 is made of a conductive material that conducts electricity. Examples of such conductive materials include copper, aluminum, and alloys thereof. The conductor body 41 may be wound around at least a part of the core body 1. An example of the conductor main body 41 shown in FIGS. 1 to 4 is a strip-shaped body bent into a substantially U-shape, but may have a wide variety of shapes such as a string-shaped body and a rod-shaped body. The ends 42, 43 are connected to a power supply circuit (not shown) to be supplied with a direct current or an alternating current.

An example of the conductor main body 41 shown in FIGS. 1 and 2 is wound around the core main body 1 by arranging the conductor main body 41 in the groove 1g of the core main body 1. An example of the conductor body 41 extends from the front surface 1b to the back surface 1c through the upper surface 1a. Specifically, an example of the conductor main body 41 includes a first groove accommodating portion 41b, an upper surface groove accommodating portion 41a, and a second groove accommodating portion 41c. A part of the upper surface groove accommodating portion 41a may protrude upward from the upper surface groove portion 1ga, but it is preferable that the entire upper surface groove accommodating portion 41a is accommodated in the upper surface groove portion 1ga. The entire first groove accommodating portion 41b is accommodated in the first groove accommodating portion 1gb. The entire second groove accommodating portion 41c may be accommodated in the second groove accommodating portion 1 gc. The entire example of the conductor body 41 may be accommodated in the groove 1 g. The upper surface groove accommodating portion 41a includes an upper surface 41aa facing upward of the core body 1, and the first groove accommodating portion 41b includes a facing surface 41bb facing the first core member 2 and a second groove accommodating portion. 41c includes a facing surface 41cc facing the second core member 3. The upper surface 41aa may be located on the bottom side of the groove 1g with respect to the opening of the upper surface 1a or the groove 1g, or may protrude from the upper surface 1a or the opening of the groove 1g. The facing surface 41bb may be located on the bottom side of the groove 1g from the front surface 1b or the opening of the groove 1g, and the facing surface 41cc may be located on the bottom side of the groove 1g from the back surface 1c or the opening of the groove 1g. good.

The gap space between the first core member 2 and the core body 1 extends in the width direction of the conductor body 41 (here, in the y-axis direction), and the gap space between the second core member 3 and the core body 1 is a conductor. It extends in the width direction of the main body 41 (here, in the y-axis direction).

The number of turns of this example of the conductor body 41 is one turn or less, but the number of turns of the conductor body 41 is not limited to this, and may be one turn or a plurality of turns. An example of the end portion 42 extends from the first groove accommodating portion 41b of the conductor body 41 to the first core member 2 and is arranged in the groove 2a of the first core member 2. An example of the end portion 43 extends from the second groove accommodating portion 41c of the conductor main body 41 to the outside of the second core member 3 and is arranged in the groove 3a of the second core member 3. Further, it is preferable that the ends 42 and 43 protrude from the bottom surface 1f and the grooves 2a and 3a from the inside to the outside (here, the z-axis minus side) because they can be easily connected to the power supply circuit. Further, if the ends 42 and 43 are flush with the bottom surface 1f and the openings of the grooves 2a and 3a, they can be easily connected to the power supply circuit and the height of the inductor element 10 can be suppressed. Therefore, it is more preferable. An example of the ends 42 and 43 may be located inside the grooves 2a and 3a, respectively, but may be located at a position where the connection of the power supply circuit can be secured. An example of the end portion 42 may extend from the first groove accommodating portion 41b of the conductor main body 41 to the center of the bottom surface 1f of the core main body 1, and an example of the end portion 43 is a second example of the conductor main body 41. It may extend from the groove accommodating portion 41c to the center of the bottom surface 1f of the core main body 1.

Further, as shown in FIG. 11, an example of the end portion 42 extends from the first groove accommodating portion 41b of the conductor main body 41 to the first core member 2 and passes through the groove 2a of the first core member 2. , May extend to the center side (here, the z-axis plus side) of the main surface 2c of the first core member 2. As shown in FIG. 11, an example of the end portion 43 extends outward from the second groove accommodating portion 41c of the conductor main body 41 to the outside of the second core member 3, and passes through the groove 3a of the second core member 3. Then, it may extend to the center side (here, the z-axis plus side) of the main surface 3c of the second core member 3. The central side of the main surface 2c of the first core member 2 in the example of the end portion 42 and the central side of the main surface 3c of the second core member 3 in the example of the end portion 43 are connected to the power supply circuit (not shown). Be connected. An example of the end portion 42 is preferably flush with the opening of the bottom surface 1f and the groove 2a because the height of the inductor element 10 can be suppressed. An example of the end portion 43 is preferably flush with the opening of the bottom surface 1f and the groove 3a because the height of the inductor element 10 (here, the total length in the z-axis direction) can be suppressed.

Here, an alternating current is supplied to the inductor element 10. In the inductor element 10, there is a gap space between the first core member 2 and the core body 1, and this gap space extends in the width direction of the conductor body 41. The entire first groove accommodating portion 41b of the conductor body 41 is accommodated in the first groove accommodating portion 1gb. Therefore, although the leakage flux is generated from this gap space, it is difficult to hit the surface of the first groove accommodating portion 41b of the conductor main body 41. Therefore, it is possible to suppress the generation of eddy currents on the surface of the conductor body 41 and suppress the generation of AC loss.

Further, the inductor element 10 includes a second core member 3, and the core main body 1 is arranged between the first core member 2 and the second core member 3. There is a gap space extending in the width direction of the conductor body 41 between the core body 1 and the second core member 3. The entire second groove accommodating portion 41c of the conductor body 41 is accommodated in the second groove accommodating portion 1gc. According to such a configuration, the leakage flux generated from the gap space between the core main body 1 and the second core member 3 is more difficult to hit the surface of the second groove accommodating portion 41c of the conductor main body 41. Therefore, the generation of eddy current on the surface of the conductor body 41 is suppressed, and the generation of AC loss is further suppressed.

Further, in the inductor element 10, the entire first core member 2 is spaced from the first groove portion 1gb of the groove 1g of the core body 1 at a predetermined distance, and the entire second core member 3 is formed of the core body 1. A predetermined distance may be provided from the second groove portion 1gc of the groove 1g. In such a case, since the entire first core member 2 and the second core member 3 are located outside the groove 1g, they do not enter the inside of the groove 1g. That is, the occurrence of AC loss due to the first core member 2 and the second core member 3 entering the inside of the groove 1g is suppressed. Therefore, the occurrence of AC loss can be further suppressed.

Further, in the inductor element 10, one of the intervals D1 and the interval D2 may be larger than the other. In such a case, the DC superimposition characteristic of the inductor element 10 can take the value of the inductance L in a plurality of stages according to the value of the DC current ldc.

Further, the inductor element 10 maintains good DC superimposition characteristics while suppressing the occurrence of AC loss. The inductor element 10 can suppress the occurrence of alternating current loss even when an alternating current having a high frequency is supplied. Therefore, the inductor element 10 can be used as a power inductor for a power supply circuit, and the power inductor is preferable because it has good DC superimposition characteristics even if it is small in size.

(Embodiment 2)
The inductor element according to the second embodiment will be described with reference to FIGS. 5 to 7. The inductor element according to the second embodiment has the same configuration as the inductor element 10 (see FIGS. 1 to 4) except for the first core member 2 and the second core member 3. Hereinafter, a configuration different from that of the inductor element 10 will be described. In FIG. 6, the conductor 4 is drawn using thin lines for the sake of clarity, but it should be noted that the conductor 4 is shielded by the core member 23.

As shown in FIG. 5, the inductor element 20 includes a core member 23 having a plate shape bent into a U-shape, a C-shape, or a U-shape. The core member 23 includes a first plate-shaped portion 23b, a second plate-shaped portion 23c, and a connecting portion 23a. The first plate-shaped portion 23b and the second plate-shaped portion 23c are mechanically connected via the connecting portion 23a. Specifically, the first plate-shaped portion 23b, the second plate-shaped portion 23c, and the connecting portion 23a are integrated, and the plate is bent into a U-shape, a C-shape, or a U-shape. It has the same shape as the shape. An example of the inductor element 20 shown in FIGS. 5 to 7 has the same shape as a plate-shaped body bent into a U-shape. The core body 1 is arranged between the first plate-shaped portion 23b and the second plate-shaped portion 23c. Between the core main body 1 and the first plate-shaped portion 23b, there is a gap space extending in the width direction (here, the y-axis direction) of the conductor main body 41. Between the core main body 1 and the second plate-shaped portion 23c, there is a gap space extending in the width direction (here, the y-axis direction) of the conductor main body 41. Further, between the core body 1 and the connecting portion 23a, there is a gap space extending in the width direction (here, the y-axis direction) of the conductor body 41. The core member 23 mechanically connects the first core member 2 and the second core member 3 via a core member having the same shape as the connecting portion 23a, and has the same shape as an integrated plate-shaped body. Has. The first plate-shaped portion 23b includes a groove 23d, and the groove 23d has the same configuration as the groove 2a (see FIGS. 1, 2, and 4) of the first core member 2. Further, the second plate-shaped portion 23c includes a groove 23e, and the groove 23e has the same configuration as the groove 3a (see FIG. 2) of the second core member 3.

Here, an alternating current is supplied to the inductor element 20. In the inductor element 20, there is a gap space between the first plate-shaped portion 23b and the core main body 1, and this gap space extends in the width direction of the conductor main body 41. The entire first groove accommodating portion 41b of the conductor body 41 is accommodated in the first groove accommodating portion 1gb. Therefore, although the leakage flux is generated from the gap space between the core main body 1 and the first plate-shaped portion 23b, it is difficult to hit the surface of the first groove accommodating portion 41b of the conductor main body 41. Therefore, similarly to the inductor element 10 (see FIGS. 1 to 4), it is possible to suppress the generation of eddy currents on the surface of the conductor body 41 and suppress the generation of AC loss.

Further, in the inductor element 20, the core main body 1 is arranged between the first plate-shaped portion 23b and the second plate-shaped portion 23c, and is arranged between the core main body 1 and the second plate-shaped portion 23c. Has a gap space extending in the width direction of the conductor body 41. The entire second groove accommodating portion 41c of the conductor body 41 is accommodated in the second groove accommodating portion 1gc. According to such a configuration, the leakage flux generated from the gap space between the core main body 1 and the second plate-shaped portion 23c is more difficult to hit the surface of the second groove accommodating portion 41c of the conductor main body 41. .. Therefore, the generation of eddy currents on the surface of the conductor body 41 is suppressed, and the generation of AC loss is further suppressed as in the inductor element 10 (see FIGS. 1 to 4).

Further, in the inductor element 20, there is a gap space between the connection portion 23a and the core main body 1, and this gap space extends in the width direction of the conductor main body 41. The entire upper surface groove accommodating portion 41a of the conductor main body 41 is accommodated in the upper surface groove accommodating portion 1ga. According to such a configuration, the leakage flux generated from the gap space between the core main body 1 and the connection portion 23a is more difficult to hit the surface of the upper surface groove accommodating portion 41a of the conductor main body 41. Therefore, the generation of eddy currents on the surface of the conductor body 41 is further suppressed. That is, by accommodating the entire conductor body 41 in the groove 1 g, the leakage flux generated from the gap space is less likely to hit the surface of the conductor body 41, so that the generation of eddy current on the surface of the conductor body 41 can be suppressed.

Further, in the inductor element 20, the entire first plate-shaped portion 23b is spaced from the first groove portion 1gb of the groove 1g of the core main body 1 at a predetermined distance, and the second plate-shaped portion 23c is the core main body 1. A predetermined distance may be provided from the second groove portion 1 gc of the groove 1 g, and the connecting portion 23a may be further spaced from the upper surface groove portion 1 ga of the groove 1 g of the core main body 1. In such a case, the entire first plate-shaped portion 23b, the second plate-shaped portion 23c, and the connecting portion 23a are located outside the groove 1g, so that they do not enter the inside of the groove 1g. That is, the occurrence of AC loss due to the first plate-shaped portion 23b, the second plate-shaped portion 23c, and the connecting portion 23a entering the inside of the groove 1g is suppressed. Therefore, the occurrence of AC loss can be further suppressed.

Further, in the inductor element 20, one of the interval D21 and the interval D22 may be larger than the other. In such a case, similarly to the inductor element 10 (see FIGS. 1 to 4), the DC superimposition characteristic of the inductor element 20 can take the value of the inductance L in a plurality of stages according to the value of the DC current ldc. However, in the inductor element 10 (see FIGS. 1 to 4), the first core member 2 and the second core member 3 are separated, while in the inductor element 20, the first plate-shaped portion 23b and the first plate-shaped portion 23b are separated. The second plate-shaped portion 23c is mechanically connected to the second plate-shaped portion 23c via the connecting portion 23a. Therefore, unlike the first core member 2 and the second core member 3 in the inductor element 10, the first plate-shaped portion 23b and the second plate-shaped portion 23c in the inductor element 20 have uniform magnetic saturation. Can progress to. Therefore, the DC superimposition characteristic of the inductor element 20 tends to have a smaller number of steps of the possible inductance L value than the DC superimposition characteristic of the inductor element 10 (see FIGS. 1 to 4).

Further, the inductor element 20 maintains good DC superimposition characteristics while suppressing the occurrence of AC loss. The inductor element 20 can suppress the occurrence of alternating current loss even when an alternating current having a high frequency is supplied. Therefore, similarly to the inductor element 10 (see FIGS. 1 to 4), the inductor element 20 can be used as a power inductor for a power supply circuit, and the power inductor has good DC superimposition characteristics even if it is small. It is preferable to have.

Further, the inductor element 20 includes a core main body 1, a core member 23, that is, two core members. On the other hand, the inductor element 10 (see FIGS. 1 to 4) includes a core main body 1, a first core member 2, and a second core member 3, that is, three core members. Therefore, since the inductor element 20 has a smaller number of core members than the inductor element 10, it has an advantage in that the number of manufacturing steps is small.

Further, as described above, the DC superimposition characteristic of the inductor element 20 tends to have a smaller number of steps of the possible inductance L value than the DC superimposition characteristic of the inductor element 10 (see FIGS. 1 to 4). It is preferable to use the inductor elements 10 and 20 properly according to the characteristics and applications of the desired inductor element. For example, when it is desired to change the DC superimposition characteristic by changing the intervals D1 and D2 (see FIG. 2), the inductor element 10 may be used. Further, when the number of manufacturing steps is small and stable DC superimposition characteristics are desired, the inductor element 20 may be used.

(Example)
Next, an embodiment relating to the inductor element 10 according to the first embodiment will be described.

The inductor element according to the first embodiment has the same configuration as the inductor element 10. Specifically, a copper plate having a width of 2 mm and a thickness of 0.6 mm was used as the conductor. As the core body, a rectangular parallelepiped magnetic material having a width direction (y direction) of 7 mm, a length direction (x direction) of 6 mm, and a height direction (z direction) of 10 mm was used. This magnetic material is provided with grooves having a width of 2.2 mm and a depth of 0.8 mm on the upper surface and the surfaces facing the first core member and the second core member, respectively. As the first core member, a rectangular parallelepiped magnetic material having a width direction of 7 mm, a length direction of 2 mm, and a height direction of 10 mm was used. A groove for forming a conductor terminal is provided on the bottom surface of the first core member. This groove has a width of 2.2 mm and a depth of 0.8 mm. As the second core member, a magnetic material having the same configuration as that of the first core member was used. The magnetic material was formed using a material having a relative permeability of 2000. The conductor was arranged so as to fit in the groove provided in the core body. The first core member and the second core member were adjusted so that the inductance was 100 nH, and were fixed to the side surface of the core body in which the conductor was arranged by using an adhesive. The terminal of the conductor was created by bending along the groove provided on the bottom surface of the first core member and the second core member. The distance between the core body and the first core member and the distance between the core body and the second core member are the same.

The inductor element according to the second embodiment has the same configuration as the inductor element according to the first embodiment, except that the distance between the core body and the first core member and the distance between the core body and the second core member are different. Has.

The inductor element according to Comparative Example 1 has the same configuration as the inductor element 90 (see FIGS. 12 and 13). Specifically, a copper plate having a width of 2 mm and a thickness of 0.6 mm was used as the conductor. As the E-shaped core member, a rectangular parallelepiped magnetic material having a width direction (y direction) of 3.5 mm, a length direction (x direction) of 10 mm, and a height direction (z direction) of 10 mm was used. Two grooves with a width of 0.8 mm and a depth of 1.1 mm are provided on one surface of the magnetic material at a position symmetrical to the center position in the length direction of the magnetic material, and the side legs and the center are provided. Formed with legs. The distance between the grooves was 4.4 mm. The conductor was wrapped around the center leg. Two of these magnetic materials were prepared and arranged so as to face each other. The magnetic bodies were fixed by adjusting the gap space between the magnetic materials so that the inductance was 100 nH, and using a resin.

The inductor element according to Comparative Example 2 has the same configuration as the inductor element according to the first embodiment, except that the conductor protrudes 0.1 mm from the groove of the core body.

The DC superimposition characteristics of the inductor elements according to Example 1 and Comparative Example 1 were measured and shown in FIG. Further, the inductor elements according to Example 1, Comparative Example 1, and Comparative Example 2 were measured and shown in FIG. In this measurement, the AC current waveform was a sine wave with 700 kHz and an effective value of 3.6 A. Further, the DC superimposition characteristics of the inductor elements according to the first and second embodiments were measured and shown in FIG. It should be noted that the measured values of the inductance L of Example 1 shown in FIGS. 9 and 10 were measured at different times.

As shown in FIG. 8, in Example 1 and Comparative Example 1, the inductance L decreased when the direct current ldc reached a predetermined value. In Example 1, the direct current ldc [A] at which the inductance L starts to decrease is considered to be 100 to 110, which is higher than the value 90 to 100 in Comparative Example 1 and shows good direct current superimposition characteristics.

As shown in FIG. 9, the AC losses of the inductor elements according to Example 1, Comparative Example 1, and Comparative Example 2 were 29.5 mW, 37.1 mW, and 41.5 mW, respectively. The inductor element according to the first embodiment has an AC loss about 20% smaller than that of the inductor element according to the comparative example 1. The inductor element according to the first embodiment has an AC loss about 29% smaller than that of the inductor element according to the second embodiment.

As shown in FIG. 10, in the first embodiment, the value of the inductance L is roughly two steps according to the value of the direct current ldc. On the other hand, in Example 2, the value of the inductance L was approximately three stages according to the value of the direct current ldc.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. For example, although the inductor element 10 includes the second core member 3, the inclusion of the second core member 3 may be omitted depending on the required characteristics.

10, 20 Inductor element 1 Core body 1a Top surface 1b Front surface 1c Back surface 1d Right side surface 1e Left side surface 1f Bottom surface 1g Groove 1ga Top surface groove part 1gb, 1gc Groove part 2, 3, 23 Core member 2a, 3a, 23d, 23e Groove 23a Connection part 23b , 23c Plate-shaped part 4 Conductor 41 Conductor body 41a Top surface groove accommodating part 41aa Top surface 41b, 41c Groove accommodating part 41bb, 41cc Opposing surface 42, 43 Ends D1, D2, D21, D22 Spacing W1 Width ldc DC current t1 Thickness

Claims (6)

A conductor that includes a conductor body and one end that connects to one end of the conductor body, and is a strip-shaped body.
With the core body
With a first core member,
The conductor body is wound around the core body so that the thickness direction of the conductor body intersects the surface of the core body.
The width direction of the conductor body is along the surface of the core body around which the conductor body is wound, and intersects with the length direction of the conductor body.
The core body and the first core member are arranged at predetermined intervals in the thickness direction of the conductor body.
Between the core body and the first core member, there is a gap space extending in the width direction of the conductor body.
The core body comprises a core body groove that accommodates the conductor body.
The core body groove includes a first groove portion arranged on a facing surface of the core body facing the first core member.
The conductor body comprises a first groove accommodating portion.
The entire first groove accommodating portion is accommodated in the first groove accommodating portion.
The first core member includes a first core member groove.
The one end is arranged in the first core member groove.
Inductor element. Further equipped with a second core member,
The conductor further comprises an other end that connects to the other end of the conductor body.
The core body is arranged between the first core member and the second core member.
Between the core body and the second core member, there is a gap space extending in the width direction of the conductor body.
The core body groove further includes a second groove portion arranged on the facing surface of the core body facing the second core member.
The conductor body further comprises a second groove accommodating portion.
The entire second groove accommodating portion is accommodated in the second groove accommodating portion.
The second core member includes a second core member groove.
The other end is arranged in the second core member groove.
The inductor element according to claim 1. The core body groove accommodates the entire conductor body.
The inductor element according to claim 1 or 2. The entire first core member is spaced from the core body groove at a predetermined distance.
The entire second core member is spaced from the core body groove at a predetermined distance.
2. The inductor element according to claim 2, wherein the inductor element according to claim 2 is cited. The size of the distance between the core body and the first core member is different from the size of the distance between the core body and the second core member.
2. The inductor element according to claim 3, or claim 3 or claim 4, which cites claim 2. The first and second core members are mechanically connected and integrated via a connecting portion.
2. The inductor element according to claim 2, or any one of claims 3 to 5, which cites claim 2.

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