JPH10303028A - Inductance element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductance element in which a drum core is fixed so as to be always positioned at an almost center part of a sleeve core, and a part, where a flange part of the drum core and the sleeve core are overlapped with each other, is so fixed that a magnetic resistance is always kept constant. SOLUTION: An inductance element comprises a drum core 13 containing a cylindrical part 11 and flange parts 12a and 12b provided on both ends of the cylindrical part 11, a coil winding 14 wound around the cylindrical part 11 of the drum core 13, and a sleeve core 17 of a U-shaped cross section, which has a top surface 15a and two side surfaces 15b and 15c joined to the top surface 15a, and is provided with taper parts 16 at the inside of joining parts of the top surface 15a and the two side surfaces 15b and 15c. And the drum core 13 is so installed in the sleeve core 17 that the taper part 16 of the sleeve core 17 is brought into contact with an edge part 18 of one flange part 12a of the drum core 13. By providing the taper part 16, the drum core 13 is fixed at almost the center part of the sleeve core 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inductance element, and more particularly to an inductance element used for a choke coil and a transformer.

[0002]

2. Description of the Related Art FIG. 6 shows a sectional view of a conventional inductance element. The inductance element 50 includes a pillar 51 and flanges 52 a, 5 a provided at both ends of the pillar 51.
2b, a coil winding 54 wound around the pillar 51 of the drum core 53, and a sleeve core 56 having a substantially U-shaped cross section having an upper surface 55a and two side surfaces 55b and 55c joined to the upper surface 55a. Consists of And
The drum core 53 is mounted in the sleeve core 56 so that the drum core 53 is located at the center of the sleeve core 56.

[0003]

However, in the above-described conventional inductance element, when the drum core is mounted in the sleeve core, it is difficult to position the drum core. Therefore, the position of the drum core in the sleeve core is fixed. Without
As a result, there is a problem that the total magnetic resistance of the drum core and the sleeve core varies, and a desired inductance value cannot be obtained. In the worst case, the end of the flange portion of the drum core comes into contact with the inside of the sleeve core, which is a value far apart from a desired inductance value.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. The present invention has been made so that the drum core is always located substantially at the center of the sleeve core, and the flange core of the drum core and the sleeve core are not always connected. It is an object of the present invention to provide an inductance element capable of fixing an overlapping portion so that a magnetic resistance is constant.

[0005]

In order to solve the above-mentioned problems, an inductance element according to the present invention comprises a drum core having a column and flanges provided at both ends of the column;
A coil winding wound around the pillar portion of the drum core, an upper surface and two side surfaces joined to the upper surface, and a substantially U-shaped cross section including a taper portion inside a joint portion between the upper surface and the two side surfaces. Wherein the drum core is mounted in the sleeve core such that a tapered portion of the sleeve core contacts at least one flange portion of the drum core.

According to the inductance element of the present invention, since the tapered portion is provided inside the sleeve core and the drum core is mounted in the sleeve core such that the tapered portion contacts the flange portion of the drum core, the drum core is always mounted. It can be fixed so as to be located substantially at the center of the sleeve core, and so that the overlapping portion of the flange portion of the drum core and the sleeve core has a constant magnetic resistance.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an exploded perspective view and a sectional view of an embodiment of the inductance element according to the present invention. The inductance element 10 includes a drum core 13 having a pillar portion 11 and flange portions 12a and 12b provided at both ends of the pillar portion 11, a coil winding 14 wound around the pillar portion 11 of the drum core 13, and a flat upper surface. 15a and two side surfaces 15b and 15c joined to the upper surface 15a thereof,
It comprises a sleeve core 17 having a substantially U-shaped cross section provided with a tapered portion 16 inside the joint between the upper surface 15a and the two side surfaces 15b and 15c.

The tapered portion 1 of the sleeve core 17
The drum core 13 is mounted in the sleeve core 17 so that 6 contacts the edge portion 18 of one flange portion 12a of the drum core 13. Here, by providing the tapered portion 16 on the sleeve core 17, the drum core 13 can be fixed to a substantially central portion of the sleeve core 17.

FIG. 3 shows the flange portion 12 of the drum core 13.
The positional relationship between the drum core 13 and the sleeve core 17 when the width of a decreases from a1 to a2 is shown. This figure 3
Therefore, even if the width of the flange portion 12a of the drum core 13 is reduced, the contact point between the edge portion 18 of the flange portion 12a and the tapered portion 16 of the sleeve core 17 simply moves from s1 to s2, and the drum core 13 is always It can be seen that it can be fixed to the approximate center of the sleeve core 17.

The drum core 13 and the sleeve core 17
Is increased from T1 to T2, and the distance between the end face of the other flange portion 12b of the drum core 13 and the side surfaces 15b and 15c of the sleeve core 17 is increased from G1 to G2, so that the flange of the drum core 13 is increased. Part 1
Even if the width of 2a decreases from a1 to a2, the total magnetic resistance of the drum core 13 and the sleeve core 17 does not change.

That is, the flange portion 1 of the drum core 13
Even if the widths of 2a and 12b vary during the manufacturing process, the total magnetic resistance of the drum core 13 and the sleeve core 17 is
It can be seen that the constant can be always maintained, and as a result, the variation in the inductance value can be suppressed to a small value. The variation between the flange portion 12a and the flange portion 12b is substantially the same.

FIG. 4 shows the relationship between the width of the flange portion of the drum core 13 and the inductance value L. In FIG. 4, the solid line indicates the inductance value of the inductance element 10 of the present embodiment, and the broken line indicates the inductance value of the conventional inductance element 50 (FIG. 5).

From FIG. 4, it can be seen that the inductance element 10 of the present embodiment has less variation in inductance value than the inductance element 50 of the conventional example, that is, even if the width of the flange portion of the drum core 13 varies.
It was proved that the inductance value of the inductance element 10 hardly varied.

As described above, according to the inductance element of this embodiment, the tapered portion is provided inside the sleeve core, and the drum core is mounted in the sleeve core such that the tapered portion contacts the flange portion of the drum core. Therefore, even if the width of the flange portion of the drum core varies, the drum core is always positioned substantially at the center of the sleeve core, and the magnetic resistance of the overlapping portion between the flange portion of the drum core and the sleeve core is constant. Can be fixed. Therefore, since the total magnetic resistance of the drum core and the sleeve core can be always kept constant, the variation in the inductance value can be suppressed to a small value.

Further, even if the width of the flange portion of the drum core varies in the manufacturing process, variation in the inductance value of the inductance element can be suppressed.
The defective rate of the inductance element in the manufacturing process can be reduced.

In the above-described inductance element, as shown in FIG. 1, the drum core 13 is mounted in the sleeve core 17 from the one flange portion 12a side, and the one flange portion 12a of the drum core 13 is
7, the drum core 13 is mounted in the sleeve core 17 from the lateral direction, as shown in a modified example of FIG.
Of both sleeve portions 17a and 12b
The same effect can be obtained by contacting the tapered portion 16.

Also, the case where the pillar portion of the drum core has a substantially cylindrical shape has been described. However, the pillar portion may have any shape, and the same effect can be obtained, for example, when the pillar portion has a substantially rectangular shape.

Further, the case where the flange portion of the drum core and the sleeve core have a substantially rectangular shape has been described, but a similar effect can be obtained with a substantially circular shape, a substantially elliptical shape, and the like.

[0019]

According to the inductance element of the present invention,
The drum core is mounted inside the sleeve core so that the tapered part is provided inside the sleeve core and the tapered part contacts the flange part of the drum core. It can be fixed so as to be located substantially at the center of the core, and so that the overlapping portion of the flange portion of the drum core and the sleeve core has a constant magnetic resistance. Therefore, since the total magnetic resistance of the drum core and the sleeve core can be always kept constant, the variation in the inductance value can be suppressed to a small value.

Further, even if the width of the flange portion of the drum core varies in the manufacturing process, variation in the inductance value of the inductance element can be suppressed.
The defective rate of the inductance element in the manufacturing process can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment according to an inductance element of the present invention.

FIG. 2 is a cross-sectional view of the inductance element of FIG. 1 taken along line II-II.

FIG. 3 is a sectional view showing a positional relationship between a drum core and a sleeve core of the inductance element of FIG.

FIG. 4 is a diagram showing a relationship between a width of a flange portion of a drum core and an inductance value L.

FIG. 5 is an exploded perspective view showing a modification of the inductance element of FIG. 1;

FIG. 6 is a sectional view showing a conventional inductance element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inductance element 11 Column part (column part) 12a, 12b Flange part 13 Drum core 14 Coil winding 15a Upper surface 15b, 15c Side surface 16 Tapered part 17 Sleeve core

Claims (1)

[Claims] 1. A drum core having a pillar portion and flange portions provided at both ends of the pillar portion, a coil winding wound around the pillar portion of the drum core, an upper surface, and two side surfaces joined to the upper surface. A sleeve core having a substantially U-shaped cross section provided with a tapered portion inside a joint portion between the upper surface and the two side surfaces, wherein the drum core is provided in the sleeve core, and the tapered portion of the sleeve core is provided in the drum core. Characterized by being mounted so as to contact at least one of the flange portions.