JP2876313B2 - Inductance adjusting member and inductance adjusting method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inductance adjusting member and an inductance adjusting method.

[0002]

2. Description of the Related Art In an inductance element having a core and a coil, it is not possible to obtain a high-precision inductance simply by winding the coil around the core because of the winding accuracy of the coil. Therefore, in order to obtain an element having high-precision inductance, a method of trimming (cutting out the core), inserting an inductance adjusting member, or the like after the winding operation of the coil around the core is adopted.

[0003] In the trimming method, it takes time and effort to cut out the core, and a more accurate inductance cannot be obtained as in the method of inserting the inductance adjusting member described below.

Hereinafter, a conventional inductance element using an inductance adjusting member insertion method will be described with reference to FIG.

[0005] 1 is an inductance element using a drum-type core, 13 is a drum-type core made of ferrite having a flange portion 12, 13 a is a through hole provided in the center of the core 13, and 14 is an outer periphery of the core 13 Is an inductance adjusting member made of ferrite having a slit 4a provided on the head end side, a male screw 4b provided on the outer periphery of the cylindrical portion 4d, and an inductance adjusting shaft 4c provided at the center. The inductance adjuster 5 has a bottom part 5b and a cylindrical part 5c, and is provided with a female screw 5d screwed to the male screw 4b on the inner periphery of the cylindrical part 5c. A is a lead wire led out from a lead hole (not shown) of the flange portion 12 and the bottom portion 5b of the core 13 and A is a magnetic path center formed by the inductance element 1.

The center of the through hole 13a is located at the magnetic path center A.
Therefore, the inductance adjustment shaft 4c coincides with the magnetic path center A.

Here, a method of finely adjusting the inductance will be described. After the coil 14 is wound around the core 13, the male screw 4b is screwed into the female screw 5d by turning the slit 4a of the inductance adjuster 4 with a flathead screwdriver or the like so that the inductance adjustment shaft 4c is inserted into the through hole 13a. Combine. Then, the inductance adjuster 4 is moved in the direction of arrow B to finely adjust the inductance.

[0008]

As described above, in the conventional inductance element, since the inductance adjusting tool is only fixed by screwing, when the inductance element is subjected to vibration, the inductance adjusting axis is moved by the arrow. Since there is a possibility that the inductance may fluctuate by moving in the direction B, reliability is lacking.

Further, since the inductance adjusting shaft is a rigid body, it cannot be easily bent. For this reason, it cannot be applied to an inductance element having a bent insertion portion, which is the center of a magnetic path such as a toroidal core, and its application range is limited.

An object of the present invention is to provide an inductance adjusting member having high accuracy and high reliability, which can be applied to an inductance element having a bent insertion portion such as a toroidal core, and an inductance adjusting method using the same. Is to provide.

[0011]

An inductance adjusting member according to the present invention is inserted through the insertion portion of an inductance element comprising a core, an insertion portion provided at the center of the core axis, and a coil wound around the core. Wherein the adjusting member is a thin wire having a magnetic portion and a non-magnetic portion.

[0012] The inductance adjusting method of the present invention is directed to an inductance adjusting method of an inductance element comprising a core, an insertion portion provided at the center of the axis of the core, and a coil wound around the core. The present invention is characterized in that an inductance adjusting member made of a thin wire having a body portion is inserted into the insertion portion, and the inductance is adjusted by changing the insertion position.

When the winding of the coil around the core is completed,
A certain target inductance is obtained. Next, an inductance adjustment line is arranged in the insertion portion, and the inductance adjustment member is moved along the insertion portion to finely adjust the inductance to obtain a target inductance.

When both ends of the adjusting member having the magnetic member and the non-magnetic member are fixed to the flange end face by the movement preventing member so that the inductance adjusting member does not move, a highly reliable inductance element in which the inductance does not fluctuate can be obtained. Can be

[0015]

FIG. 1 is a sectional view of an inductance element according to a first embodiment of the present invention.

Reference numeral 10 denotes an inductance element using a drum core, 11 denotes a magnetic wire 11a and a non-magnetic wire 11b.
An inductance adjusting member (having a magnetic part and a non-magnetic part) (see FIG. 4 (a)), which is an inductance adjusting member, and 13 a drum-shaped core made of ferrite having a flange 12; 13a is the core 1
A through-hole, which is an insertion portion provided at the center of 3, a coil 14 wound around the core 13, and a lead wire 16 extending from the coil 14 through the lower flange 12. ,
C is the center of the magnetic path formed by the inductance element 10, and 15 is a resin which is a movement preventing member for preventing the movement of the inductance adjustment line 11.

The order of assembling the inductance element 10 will be described.

A coil 14 is wound around the core 13 and a lead wire 16 is led out from a lead hole (not shown) of the lower flange portion 12 to obtain a target inductance to some extent.

Next, the inductance adjusting member 11 is inserted into the center of the through hole 13a (magnetic path center C) to finely adjust the inductance.

Then, the inductance adjusting line 11 is moved in the direction of arrow D to find a position where the target inductance is obtained. When the position is determined, the flange 12 and the inductance adjusting member are made of resin 15 which is a movement preventing member. 11 is fixed. Thereafter, the protruding portion 11 'of the non-magnetic material portion 11b shown by the two-dot chain line in FIG. 1 is cut.

FIG. 2 shows a second embodiment of the present invention. FIG. 2 (a) is a plan view, and FIG. 2 (b) is a sectional view taken along line EE of FIG. 2 (a).

Numeral 20 denotes an inductance element using a ring-shaped or toroidal core. Numeral 21 denotes an inductance adjusting member (FIG. 4) formed by connecting a magnetic portion 21a and a non-magnetic portion 21b at both ends thereof to form a ring. (B)), 23 is a ring-shaped core made of ferrite;
a is a concave groove which is an insertion portion provided in a ring shape on the upper surface of the core 23 as shown in FIG. 2 (b); 23b is a groove connected to a part of the concave groove 23a; Is the core 23
26 is a coil wound in a toroidal shape, 26 is a coil 24
Is a bent portion where the portion of the inductance adjusting member 21 constituting the movement preventing member that protrudes from the coil 24 is bent, and F is the center of the magnetic path bent in a ring shape.

FIG. 3 shows a modified example of the concave groove 23a which is the insertion portion of the inductance element 20 according to the second embodiment. FIG. 3A shows a concave groove 23c provided on the outer periphery of the core 23. In the example shown in the drawing, FIG.
3 is an example provided on the inner circumference. Thus, if the inductance adjusting line 21 is a groove passing through the center of the magnetic path, the inductance can be adjusted effectively.

FIG. 4A shows a first example of the inductance adjusting member 11 used in the first embodiment of FIG. 1, and FIG. 4B shows the inductance adjusting member 11 of the second embodiment in FIGS. A second example of the inductance adjusting member 21 is shown, and FIG. 3C shows an inductance adjusting member 31 of a third embodiment.

As described above, the inductance adjusting member 11 of the first embodiment is made of a magnetic material of 1 to 5 mm.
A rod-shaped wire 11a having a diameter and a wire 11a made of a non-magnetic material
And a rod-shaped wire 11b having the same diameter as that of the rod 11b butted by a butted portion 11c.

As described above, the inductance adjusting member 21 of the second embodiment includes a rod-shaped wire 21a having a diameter of 1 to 5 mm made of a magnetic material and a rod-shaped wire 21a made of a non-magnetic material and having the same diameter as the wire 21a. Is connected by butting portions 21c at both ends to form a loop.

On the other hand, the inductance adjusting line 31 according to the third embodiment has a rod line 31b of 1 to 5 mm square made of non-magnetic material and a rod line 31a of 1 to 5 mm made of magnetic material.
Are formed by bonding at the bonding surface 31c.

Examples of the material of the magnetic wires 11a, 21a, 31a include permalloy, an amorphous alloy, a ferritic stainless steel, etc., and the nonmagnetic wires 11b, 21a.
Examples of the materials b and 31b include aluminum, austenitic stainless steel, and polymer fibers. Also,
The butting portions 11c and 21c can be joined by ultrasonic welding or the like, and the joining surface 31c can be joined by an adhesive or the like, and can be easily bent because it is as thin as 1 to 5 mm.

Since the present invention is configured as described above, the following effects can be obtained.

(A) Inductance adjusting members 11, 21, 21
Since 31 is as thin as 1 to 5 mm, it can be easily bent. Furthermore, since it has not only the wires (portions) 11a, 21a, 31a of the magnetic material affecting the inductance but also the wires (portions) 11b, 21b, 31b of the non-magnetic material,
The adjusting members 11, 21, 31 can be easily bent by applying a force to both ends.

Therefore, the groove 23 which is a bent insertion portion (the center of the magnetic path) such as a ring-shaped or toroidal core is provided.
a, 23b, and 23c are magnetic wires 11a, 21a, and 31 respectively.
Since a can be disposed, the application range of the method of inserting the inductance adjusting member can be expanded, and an inductance element having high-precision inductance can be obtained.

(B) By fixing both ends of the inductance adjusting member, the inductance adjusting member does not move, so that the reliability of the inductance is improved.

(C) Since the inductance adjusting member 21 of the inductance element 20 is simply bent at the bending portion 25, the time and effort for cutting can be saved unlike the inductance element 10.

The embodiments have been described above.
The present invention is not limited to this, and can be variously modified without changing the gist.

For example, a ring-shaped inductance adjusting member 21 is used for the inductance element 20. Both ends of the inductance adjusting members 11, 31 are shown in FIG. It may be bent as follows.

Although the inductance adjusting member 11 of the inductance element 10 is fixed by the resin 15, both ends of the inductance adjusting member 11 may be bent.

[0037]

As described above, the present invention has the following advantages.

By making the inductance adjusting member thin, it can be easily bent and can be easily moved in the insertion hole of the core.

Therefore, the magnetic material line can be arranged at the bent insertion portion (the center of the magnetic path) such as a ring-shaped or toroidal core, so that the application range of the insertion of the inductance adjusting member can be expanded and the height can be increased. An inductance element having an accurate inductance can be obtained.

Furthermore, since it has not only a magnetic part but also a non-magnetic part which affects the inductance, fine adjustment of the inductance can be performed by easily applying a force to both ends of the adjusting member and moving it. By changing the insertion position, highly accurate inductance adjustment can be performed.

Next, since the inductance adjusting member is fixed at both ends of the magnetic body portion and the non-magnetic material portion, the movement of the inductance adjusting member can be reliably prevented, so that the reliability of the inductance element is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an inductance element using a drum core according to a first embodiment of the present invention.

2A and 2B are diagrams illustrating an inductance element using a ring-shaped core according to a second embodiment, where FIG. 2A is a plan view and FIG.
Is an EE cross-sectional view.

FIGS. 3A and 3B are cross-sectional views showing another embodiment.

4A and 4B are external views of an inductance adjusting member, wherein FIG. 4A shows a first embodiment, FIG. 4B shows a second embodiment, and FIG. 4C shows a third embodiment.

FIG. 5 is a cross-sectional view of an inductance element using a conventional drum core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inductance element 11 Inductance adjustment member 11a Wire made of a magnetic material 11b Wire made of a non-magnetic material 13 Core 13a Through hole (insertion part) 14 Coil

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) E01F 17/00-17/08 E01F 21/06 E01F 41/00

Claims (2)

(57) [Claims] 1. An inductance adjusting member inserted into an insertion portion of an inductance element including a core, an insertion portion provided at the center of the core axis, and a coil wound around the core, wherein the adjustment member is a magnetic material. An inductance adjusting member comprising a thin wire having a portion and a nonmagnetic portion. 2. A method for adjusting the inductance of an inductance element comprising a core, an insertion portion provided at the center of the axis of the core, and a coil wound on the core, wherein the thin wire includes a magnetic portion and a non-magnetic portion. An inductance adjusting method comprising: inserting an inductance adjusting member made of the above through the insertion portion; and adjusting the inductance by changing the insertion position.