JP2019129253A - Inductor element - Google Patents

Abstract

To provide an inductor element capable of suppressing generation of an AC loss.SOLUTION: An inductor element 10 comprises a conductor 4 including a conductor body 41, a core body 1 around which the conductor body 41 is wound, and a first core member 2. A gap space extending in a width direction of the conductor body 41 is provided between the core body 1 and the first core member 2. The core body 1 comprises a groove 1g for housing the conductor body 41. The groove 1g comprises a first groove part 1gb arranged on an opposed surface of the core body 1 facing the first core member 2. The conductor body 41 comprises a first groove housing part 41b. The whole of the first groove housing part 41b is housed in the first groove part 1gb.SELECTED DRAWING: Figure 2

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.

JP2015-015470A

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

  As a specific example of such an inductor element, there is an inductor element 90 shown in FIGS. The inductor element 90 includes E-shaped core members 91 and 92 and a conductor 94. The E-shaped core members 91, 92 respectively include side legs 91a, 92a, side legs 91b, 92b, and central legs 91c (not shown), 92c. The E-shaped core members 91 and 92 are arranged such that the ends of the side legs 91a and 91b and the center leg 91c and the ends 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 space between the side leg 91 a and the side leg 92 a extends in the thickness direction of the conductor 94 (here, the x-axis direction). The gap space between the side legs 91b and the side legs 92b extends in the thickness direction of the conductor 94 (here, the x-axis direction). Since leakage magnetic flux is generated in these gap spaces, an eddy current is generated on the surface of the conductor 94. As a result, an AC loss may occur.

  The present invention shall suppress the occurrence of AC loss.

The inductor element according to the present invention is
A conductor comprising a conductor body,
A core body on which the conductor body is wound;
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 receiving the conductor body,
The groove includes a first groove portion disposed on a facing surface of the core body facing the first core member,
The conductor body includes a first groove receiving portion,
The entire first groove receiving portion is received in the first groove.

  According to such a configuration, although the leakage magnetic 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, generation | occurrence | production of the eddy current in the surface of the 1st groove | channel accommodating part of a conductor main body can be suppressed, and generation | occurrence | production of an alternating current loss can be suppressed.

Moreover, the second core member is further provided,
The core body is disposed between the first core member and the second core member,
There is a gap space extending in the width direction of the conductor main body between the core main body and the second core member, and the groove is formed on the facing surface of the core main body facing the second core member. The conductor main body further includes a second groove accommodating portion, and the entire second groove accommodating portion is accommodated in the second groove portion. It is also good.
Further, the groove may be characterized in that the whole of the conductor body is accommodated.

  According to such a configuration, the leakage magnetic 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, It is more difficult to hit the surface of the first groove housing portion and the surface of the second groove housing portion of the conductor body. Therefore, the occurrence of AC loss can be further suppressed.

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

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

  In addition, the size of the interval between the core body and the first core member may be different from the size of the interval between the core body and the second core member.

  According to such a configuration, the DC superposition characteristic of the inductor element can take a plurality of inductance values in accordance with the DC current value.

  The first and second core members may be mechanically connected via a connecting portion and integrated.

  According to such a configuration, the DC bias characteristics with the first and second core members hardly change and become stable. Moreover, there are few manufacturing processes and it is preferable.

  The present invention can suppress the occurrence of AC loss.

1 is a perspective view of an inductor element according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view of the inductor element according to the first embodiment. FIG. 3 is a perspective view of a main part of the inductor element according to the first embodiment. FIG. 3 is an enlarged perspective view of the inductor element according to the first embodiment. 6 is a perspective view of an inductor element according to Embodiment 2. FIG. 6 is a transparent perspective view of an inductor element according to Embodiment 2. FIG. 6 is a cross-sectional view of an inductor element according to Embodiment 2. FIG. It is a graph which shows a direct current | flow superimposition characteristic. 3 is a graph showing AC loss in Example 1. It is a graph which shows a direct current | flow superimposition characteristic. FIG. 3 is a cross-sectional view of an example of an inductor element according to the first embodiment. It is a perspective view of the inductor element of related technology. It is sectional drawing of the inductor element of 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. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate. 1 to 7 and 11, a three-dimensional xyz orthogonal 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 body, for example, a magnetic body such as a dust core obtained by compacting a ferrite core or a metal magnetic powder, a laminated steel plate or the like can be used.

  An example of the core body 1 shown in FIGS. 1 to 3 includes a groove 1g that accommodates at least a part of the conductor 4, and the conductor 4 does not protrude from the opening of the groove 1g 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 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 the 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, names for specifying directions are given for an example portion of the core body 1, the top surface 1 a, the front surface 1 b, the back surface 1 c, the right side surface 1 d, the left side surface 1 e, and the bottom surface 1 f. It should be noted that 1a and the like are directed in a direction different from the direction related to the part name depending on the posture of the inductor element 10. The groove 1g includes an upper surface groove portion 1ga disposed on the upper surface 1a, a first groove portion 1gb disposed on the front surface 1b, and a second groove portion 1gc disposed on the back surface 1c. The first groove 1gb, the upper surface groove 1ga, and the second groove 1gc are continuous in this order.

  Referring to FIGS. 1 and 2, the first core member 2 is a plate-like body having a groove 2a, and the second core member 3 is a plate-like body having a groove 3a. As shown in FIG. 4, the depth of the groove 2 a is preferably equal to or greater than the thickness t <b> 1 of the conductor 4. The width of the groove 2a is preferably equal to or greater 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. Similar to the core body 1, the first core member 2 and the second core member 3 are made of a magnetic material.

  Referring again to FIG. 2, the entire first core member 2 is spaced a predetermined distance from the first groove 1 gb of the groove 1 g of the core body 1, and the entire second core member 3 is A predetermined interval may be provided from the second groove portion 1gc of the groove 1g. The first core member 2 has a predetermined distance D1 from the core body 1, and the second core member 3 has a predetermined distance 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 superposition characteristic of the inductor element 10 can take a 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 disposed 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 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 body 1 and the main surface 3c faces the opposite side of the main surface 3b. There are gap spaces between the first core member 2 and the core body 1 and between the second core member 3 and the core body 1, respectively. These gap spaces may be filled with a member made of a material that is nonmagnetic and nonmetallic. By this filling, a member made of a nonmagnetic and nonmetallic material is interposed between the space between the second core member 3 and the core body 1 and the space between the first core member 2 and the core body 1. To do. Therefore, it becomes difficult for the second core member 3 and the core body 1 to contact with each other, and the first core member 2 and the core body 1 are difficult to contact with each other. A gap space between the core member 2 and the core body 1 can be easily secured. Examples of such a non-magnetic and non-metallic material include an adhesive and a resin. This resin may be mixed with a filler.

  Referring again to FIG. 2, the conductor 4 includes a conductor body 41 and end portions 42, 43 connected to the conductor body 41. The conductor 4 is made of a conductive material that conducts electricity. Examples of such a conductive material 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 band-like body bent into a substantially U shape, but may have various shapes such as a string-like body and a rod-like body. The ends 42, 43 are connected to a power supply circuit (not shown) and supplied with direct current or alternating current.

  An example of the conductor body 41 shown in FIGS. 1 and 2 is wound around the core body 1 by being disposed in the groove 1 g of the core body 1. An example of the conductor body 41 extends from the front surface 1b through the upper surface 1a to the back surface 1c. Specifically, an example of the conductor main body 41 includes a first groove housing portion 41b, an upper surface groove housing portion 41a, and a second groove housing portion 41c. A part of the upper surface groove accommodating portion 41a may protrude upward from the upper surface groove portion 1ga, but the entire upper surface groove accommodating portion 41a may be accommodated in the upper surface groove portion 1ga. The entire first groove accommodating portion 41b is accommodated in the first groove portion 1gb. The entire second groove accommodating portion 41c may be accommodated in the second groove portion 1gc. The entire example of the conductor body 41 may be accommodated in the groove 1g. The upper surface groove accommodating portion 41a includes an upper surface 41aa facing the upper side of the core body 1, the first groove accommodating portion 41b includes an opposing surface 41bb facing the first core member 2, and the second groove accommodating portion. 41 c includes a facing surface 41 cc facing the second core member 3. The upper surface 41aa may be positioned closer to the bottom of the groove 1g than the upper surface 1a or the opening of the groove 1g, or may protrude from the opening of the upper surface 1a or the groove 1g. The facing surface 41bb may be positioned on the bottom side of the groove 1g with respect to the front surface 1b or the opening of the groove 1g, and the facing surface 41cc is positioned on the bottom side of the groove 1g with respect to 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 (here, the y-axis direction) of the conductor body 41, and the gap space between the second core member 3 and the core body 1 is a conductor. The main body 41 extends in the width direction (here, the y-axis direction).

  An example of the number of turns 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 accommodation portion 41 b of the conductor main body 41 to the first core member 2 and is disposed in the groove 2 a of the first core member 2. An example of the end portion 43 extends from the second groove accommodating portion 41 c of the conductor main body 41 to the outside of the second core member 3 and is disposed in the groove 3 a of the second core member 3. In addition, it is preferable that the end portions 42 and 43 protrude from the inside of the bottom surface 1f and the grooves 2a and 3a to the outside (here, the z-axis minus side) because they can be easily connected to the power supply circuit. Further, when the end portions 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. Note that one example of the end portions 42 and 43 may be located inside the grooves 2a and 3a, respectively, but it is preferable that the end portions 42 and 43 be positions where connection of the power supply circuit can be secured. An example of the end portion 42 may extend from the first groove accommodating portion 41 b of the conductor body 41 to the center of the bottom surface 1 f of the core body 1, and an example of the end portion 43 may be the second portion of the conductor body 41. You may extend from the groove accommodating part 41c to the center of the bottom face 1f of the core main body 1.

  As shown in FIG. 11, an example of the end portion 42 extends from the first groove accommodating portion 41 b of the conductor body 41 to the first core member 2 and passes through the groove 2 a of the first core member 2. , And 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 from the second groove accommodating portion 41 c of the conductor body 41 to the outside of the second core member 3 and passes through the groove 3 a of the second core member 3. It may extend to the center side (here, the z-axis plus side) of the major surface 3 c 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 a power supply circuit (not shown). Connected. One example of the end portion 42 is preferably flush with the bottom face 1 f and the opening of the groove 2 a because the height of the inductor element 10 can be suppressed. An example of the end 43 is preferably the same as the bottom surface 1f and the opening of 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 main body 41 is accommodated in the first groove portion 1gb. Therefore, although the leakage magnetic flux is generated from this gap space, it is difficult to hit the surface of the first groove accommodating portion 41b of the conductor body 41. Therefore, generation | occurrence | production of the eddy current in the surface of the conductor main body 41 can be suppressed, and generation | occurrence | production of alternating current loss can be suppressed.

  Furthermore, the inductor element 10 includes the second core member 3, and the core body 1 is disposed between the first core member 2 and the second core member 3. Between the core body 1 and the second core member 3, there is a gap space extending in the width direction of the conductor body 41. The entire second groove accommodating portion 41c of the conductor main body 41 is accommodated in the second groove portion 1gc. According to such a configuration, the leakage magnetic flux generated from the gap space between the core body 1 and the second core member 3 is less likely to hit the surface of the second groove accommodating portion 41 c of the conductor body 41. Therefore, generation | occurrence | production of the eddy current in the surface of the conductor main body 41 is suppressed, and generation | occurrence | production of alternating current loss is further suppressed.

  In the inductor element 10, the entire first core member 2 is spaced a predetermined distance from the first groove 1 gb of the groove 1 g of the core body 1, and the entire second core member 3 is There is a case where a predetermined interval is provided from the second groove portion 1gc of the groove 1g. In such a case, the whole of the first core member 2 and the second core member 3 are located outside the groove 1g, so they do not enter the inside of the groove 1g. That is, the first core member 2 and the second core member 3 suppress the generation of AC loss due to entering the inside of the groove 1g. Therefore, the occurrence of AC loss can be further suppressed.

  In addition, in the inductor element 10, one of the interval D1 and the interval D2 may be larger than the other. In such a case, the DC bias characteristics of the inductor element 10 can take the value of the inductance L in multiple stages according to the value of the DC current ldc.

  Furthermore, the inductor element 10 maintains good direct current superposition characteristics while suppressing the occurrence of alternating current loss. Even if the inductor element 10 is supplied with an alternating current having a high frequency, the inductor element 10 can suppress the occurrence of an alternating current loss. 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 direct current superposition characteristics even if it is small.

Second Embodiment
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. Below, the structure different from the inductor element 10 is demonstrated. In FIG. 6, although the conductor 4 is drawn using a thin line for easy understanding, it is 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 in a U-shape, a C-shape, or a U-shape. The core member 23 includes a first plate-like portion 23 b, a second plate-like portion 23 c, and a connection portion 23 a. The first plate-like portion 23 b and the second plate-like portion 23 c are mechanically connected via the connection portion 23 a. Specifically, the first plate-like portion 23b, the second plate-like portion 23c, and the connecting portion 23a are integrated, and are folded into a U shape, a C shape, or a U shape. Has the same shape as the body. An example of the inductor element 20 shown in FIGS. 5 to 7 has the same shape as a plate-like body bent in a U shape. The core body 1 is disposed between the first plate-like portion 23 b and the second plate-like portion 23 c. Between the core body 1 and the first plate-like portion 23b, there is a gap space extending in the width direction (here, the y-axis direction) of the conductor body 41. Between the core body 1 and the second plate-like portion 23c, there is a gap space extending in the width direction (here, the y-axis direction) of the conductor body 41. In addition, a gap space extending in the width direction (here, the y-axis direction) of the conductor main body 41 is present between the core main body 1 and the connection portion 23 a. The core member 23 is mechanically connected to the first core member 2 and the second core member 3 via the core member having the same shape as the connecting portion 23a, and has the same shape as the integrated plate-like body. Have The first plate-like portion 23b includes a groove 23d, and the groove 23d has the same configuration as the groove 2a of the first core member 2 (see FIGS. 1, 2, and 4). The second plate-like portion 23c is provided with 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-like portion 23 b 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 main body 41 is accommodated in the first groove portion 1gb. Therefore, although the leakage magnetic flux is generated from the gap space between the core body 1 and the first plate-like portion 23b, it is difficult to hit the surface of the first groove accommodating portion 41b of the conductor body 41. Therefore, similarly to the inductor element 10 (see FIGS. 1 to 4), generation of eddy current on the surface of the conductor body 41 can be suppressed, and generation of AC loss can be suppressed.

  In the inductor element 20, the core body 1 is disposed between the first plate-like portion 23b and the second plate-like portion 23c, and between the core body 1 and the second plate-like 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 main body 41 is accommodated in the second groove portion 1gc. According to such a configuration, the leakage magnetic flux generated from the gap space between the core body 1 and the second plate-like portion 23 c is less likely to hit the surface of the second groove accommodating portion 41 c of the conductor body 41. . Therefore, generation | occurrence | production of the eddy current in the surface of the conductor main body 41 is suppressed, and generation | occurrence | production of alternating current loss is further suppressed similarly to the inductor element 10 (refer FIGS. 1-4).

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

  In the inductor element 20, the entire first plate-like portion 23 b is spaced a predetermined distance from the first groove portion 1 gb of the groove 1 g of the core body 1, and the second plate-like portion 23 c is There is a case where a predetermined interval is provided from the second groove portion 1gc of the groove 1g, and the connecting portion 23a is further provided a predetermined interval from the upper surface groove portion 1ga of the groove 1g of the core body 1. In such a case, the first plate-like portion 23b, the second plate-like portion 23c, and the entire connection portion 23a are located outside the groove 1g, and therefore do not enter the inside of the groove 1g. That is, generation | occurrence | production of the alternating current loss by the 1st plate-like-part 23b, the 2nd plate-like-part 23c, and the connection part 23a entering inside the groove | channel 1g is suppressed. Therefore, the occurrence of AC loss can be further suppressed.

  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 superposition characteristics of the inductor element 20 can take values 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 second plate-like portion 23c is mechanically connected via the connection portion 23a. Therefore, unlike the first core member 2 and the second core member 3 in the inductor element 10, the first plate-like portion 23 b and the second plate-like portion 23 c in the inductor element 20 have uniform magnetic saturation. Can progress to. For this reason, the direct current superimposition characteristics of the inductor element 20 tend to have a smaller number of possible inductance L values than the direct current superimposition characteristics of the inductor element 10 (see FIGS. 1 to 4).

  Furthermore, the inductor element 20 maintains good DC superposition characteristics while suppressing the occurrence of AC loss. Even if the inductor element 20 is supplied with an alternating current having a high frequency, the inductor element 20 can suppress the occurrence of an alternating current loss. 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 direct current superposition characteristics even if it is small. Is preferable.

  The inductor element 20 includes a core body 1 and 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 body 1, a first core member 2, and a second core member 3, that is, three core members. Therefore, since the number of core members is small compared with the inductor element 10, the inductor element 20 has the advantage in the place where the number of manufacturing processes is small.

  Further, as described above, the direct current superposition characteristics of the inductor element 20 tend to have a smaller number of stages of inductance L values than the direct current superposition characteristics of the inductor element 10 (see FIGS. 1 to 4). The inductor elements 10 and 20 may be used properly according to the desired characteristics and application as the inductor element. For example, when it is desired to change the DC bias characteristics by changing the intervals D1 and D2 (see FIG. 2), the inductor element 10 may be used. In addition, when the number of manufacturing steps is small and stable DC bias characteristics are desired, the inductor element 20 may be used.

(Example)
Next, an example of 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 body 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. The magnetic body was provided with grooves having a width of 2.2 mm and a depth of 0.8 mm on the upper surface and on the surface facing the first core member and the second core member, respectively. A rectangular parallelepiped magnetic body having a width direction of 7 mm, a length direction of 2 mm, and a height direction of 10 mm was used as the first core member. A groove for forming a conductor terminal was 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. A magnetic body having the same configuration as that of the first core member was used as the second core member. The magnetic body was formed using a material having a relative permeability of 2000. The conductor was disposed so as to fit in a groove provided in the core body. The 1st core member and the 2nd core member were adjusted so that inductance might be set to 100 nH, and it fixed to the side of the core body in which a conductor was arranged using adhesives. The conductor terminals were created by bending along the grooves provided in the bottom surfaces of the first core member and the second core member. The distance between the core body and the first core member is the same as the distance between the core body and the second core member.

  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 is different from the distance between the core body and the second core member. Have

  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 body, a rectangular parallelepiped magnetic body 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 each having a width of 0.8 mm and a depth of 1.1 mm are provided on one side of the 10 mm square of the magnetic body at symmetrical positions from the central position in the length direction of the magnetic body. Formed with legs. The distance between the grooves was 4.4 mm. A conductor was wound around the center leg. Two such magnetic bodies were produced and arranged so as to face each other. These magnetic bodies were adjusted using the resin, adjusting the gap space between these magnetic bodies so that an inductance might be set to 100 nH.

  The inductor element according to Comparative Example 2 has the same configuration as the inductor element according to Example 1 except that the conductor protrudes 0.1 mm from the groove of the core body.

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

  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 DC current ldc [A] at which the inductance L starts to decrease is considered to be 100 to 110, which is higher than the values 90 to 100 in Comparative Example 1, and shows a good DC superposition characteristic.

  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 approximately 20% smaller AC loss than the inductor element according to the first comparative example. The inductor element according to the first embodiment has an AC loss of approximately 29% smaller than that of the inductor element according to the second comparative example.

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

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, although the inductor element 10 includes the second core member 3, the provision of the second core member 3 may be omitted according to the required characteristics.

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

Claims (6)

A conductor comprising a conductor body,
A core body on which the conductor body is wound;
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 receiving the conductor body,
The groove includes a first groove portion disposed on a facing surface of the core body facing the first core member,
The conductor body includes a first groove receiving portion,
The entire first groove receiving portion is received in the first groove portion,
Inductor element. Further comprising a second core member,
The core body is disposed 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 groove further includes a second groove portion disposed on the facing surface of the core body facing the second core member,
The conductor body further comprises a second groove receiving portion,
The entire second groove receiving portion is received in the second groove portion.
The inductor element according to claim 1, characterized in that: The groove receives the whole of the conductor body.
The inductor element according to claim 1 or 2, characterized in that: The entire first core member is spaced apart from the groove by a predetermined distance,
The entire second core member is spaced a predetermined distance from the groove,
The inductor element according to claim 2 or claim 3 dependent on claim 2. The size of the gap between the core body and the first core member is different from the size of the gap between the core body and the second core member.
The inductor element according to claim 2 or claim 3 dependent on claim 2, or claim 4. The first and second core members are mechanically connected and integrated through a connection portion.
The inductor element according to claim 3, claim 4, or claim 5 dependent on claim 2 or claim 2.

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