JP2722091B2 - Inductance element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an inductance element having high inductance.

(Conventional technology) In an inductance element having a core and a coil, a high-precision inductance cannot be obtained only by winding the coil around the core due to the winding accuracy of the coil. Therefore, to obtain an element with high-precision inductance,
After the coil winding operation on the core is completed, a method such as trimming (cutting of the core) and inserting an inductance adjusting member is employed.

In the trimming method, it takes time and effort to cut 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 by the method of inserting the inductance adjusting member will be described with reference to FIG.

1 is an inductance element using a drum core, 13 is a drum core made of ferrite having a flange 12, 13
a is a through hole provided in the center of the core 13, 14 is a coil wound around the outer periphery of the core 13, 4 is a slit 4a provided on the head end side and a male screw provided on the outer periphery of the cylindrical portion 4d. 4b and an inductance adjuster, which is an inductance adjuster made of ferrite having an inductance adjustment shaft 4c disposed at the center, 5 is a male screw having a bottom 5b and a cylindrical portion 5c.
A shield case 16 in which a female screw 5d screwed to 4b is provided on the inner periphery of the cylindrical portion 5c, and a lead wire 16 is led from the coil 14 through a not-shown lead hole of the flange portion 12 of the core 13 and the bottom portion 5b. , A are the magnetic path centers formed by the inductance elements 1.

Since the center of the through hole 13a is provided so as to coincide with the magnetic path center A, the inductance adjusting shaft 4c
Will coincide with the magnetic path center A.

Here, a method of finely adjusting the inductance will be described. After winding the coil 14 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. Let it. Then, the inductance adjuster 4 is moved in the direction of arrow B to finely adjust the inductance.

(Problems to be Solved by the Invention) As described above, in the conventional inductance element, since the inductance adjustment tool is fixed only by screwing, when the inductance element is subjected to vibration, the inductance adjustment 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 apply the method of inserting the inductance adjusting member to an inductance element having high accuracy, high reliability, and in which an insertion portion which is a magnetic path center of a toroidal core or the like is bent. An object of the present invention is to provide an inductance element.

[Structure of the Invention] (Means for Solving the Problems) According to a structure of the present invention, in an inductance element having a core and a coil, a magnetic material portion and a non-magnetic material are inserted into an insertion portion provided at the center of the core. And an inductance adjusting member is arranged and fixed to the end of the insertion portion.

(Operation) When the winding operation of the coil around the core is completed, a certain target inductance is obtained. Then, after the inductance adjusting member is arranged in the insertion portion, the inductance adjustment member is moved up and down along the insertion portion to adjust the inductance value to a target inductance value. Finally, by fixing the inductance adjusting member to the end of the insertion portion using a movement preventing member so that the inductance adjusting member does not move, a highly reliable inductance element in which the inductance does not change can be obtained.

(Example) FIG. 1 is a sectional view of an inductance element according to a first example of the present invention.

Reference numeral 10 denotes an inductance element using a drum-type core, 11 denotes an inductance adjusting member (refer to FIG. 4 (a)) which is an inductance adjusting member in which a magnetic wire 11a and a non-magnetic wire 11b are butt-connected. A drum-shaped core made of ferrite having a flange portion 12, a through hole 13 a is an insertion portion (also referred to as an insertion portion) serving as a center of a magnetic path such as a core provided in the center of the core 13, and 14 is the core A coil wound around 13, 16 is a lead wire extending from the coil 14 through the lower flange 12, and C is the inductance element 10.
The magnetic path center 15 formed by the resin is a resin which is a movement preventing member for preventing the inductance adjusting line 11 from moving.

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-out hole (not shown) of the lower flange portion 12, and a target inductance is obtained to some extent.

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

Then, the inductance adjustment line 11 is moved in the direction of arrow D to obtain a position at which the target inductance is obtained.
Once this position has been determined, the resin
At 15, the flange 12 is fixed to the inductance adjustment wire 11. Thereafter, the protruding portion 11 'of the nonmagnetic line 11b shown by the two-dot chain line in FIG. 1 is cut.

FIG. 2 shows a second embodiment according to the present invention. FIG. 2 (a) is a plan view, and FIG. 2 (b) is an EE sectional view of FIG. 2 (a).

20 is an inductance element using a ring-shaped core, 21
Is an inductance adjustment line formed by connecting a magnetic material wire 21a and a non-magnetic material wire 21b at both ends thereof in a loop shape (see FIG. 4 (b)), 23 is a ring-shaped core made of ferrite, As shown in FIG. 2 (b), reference numeral 23a denotes a concave groove which is an insertion portion provided in a ring shape on the upper surface of the core 23;
b is a groove connected to a part of the concave groove 23a, and 24 is a core.
23 is a coil wound in a toroidal shape, 26 is a lead wire derived from the coil 24, 25 is a bent portion of a part of the inductance adjustment wire 21 constituting the movement preventing member that protrudes from the coil 24, F is This is the center of the magnetic path bent in a ring shape. The core 23 is not limited to the ring shape described above, but may be a toroidal 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 an example in which a concave groove 23c is provided on the outer periphery of the core 23. FIG. 3B shows an example in which a concave groove 23 d is provided on the inner periphery of the core 23. 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 the inductance adjusting line 11 of the first example used in the first embodiment of FIG. 1, and FIG. 4B shows the inductance adjusting line 11 used in the second embodiment of FIGS. A second example inductance adjustment line 21 is shown, and FIG. 3C shows a third example inductance adjustment line 31.

As described above, the inductance adjusting wire 11 of the first example is formed by abutting a rod-shaped wire 11a having a diameter of 1 to 5 mm made of a magnetic material and a rod-shaped wire 11b made of a non-magnetic material and having the same diameter as the wire 11a. This is the one connected by butt in 11c.

The inductance adjusting line 21 of the second example is a rod-shaped wire 21a having a diameter of 1 to 5 mm made of a magnetic material as described above.
And a rod-shaped wire 21b made of a non-magnetic material and having the same diameter as the wire 21a are butt-connected at butt portions 21c at both ends to form a ring.

On the other hand, the inductance adjusting wire 31 of the third example is formed by joining a rod wire 31a of 1 to 5 mm made of a magnetic material to a rod wire 31a of 1 to 5 mm square made of a non-magnetic material at a joining surface 31c. It is.

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

As described above, the inductance element of the present invention has the following effects.

(A) The inductance adjusting wires 11, 21, 31 can be easily bent because they are as thin as 1 to 5 mm. Further, not only the magnetic wires 11a, 21a, 31a affecting the inductance but also the non-magnetic wires 11b, 21b are provided. , 31b, the adjustment lines 11, 2
1,31 can be easily bent by applying force to both ends.

Therefore, the magnetic wires 11a, 21a, 31a can be arranged in the grooves 23a, 23b, 23c which are bent insertion portions (magnetic path centers) such as ring-shaped (toroidal) cores. 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) Since the both ends of the magnetic wire and the non-magnetic wire can be fixed, the inductance adjusting wire does not move, so that the reliability of the inductance is improved.

(C) Inductance adjustment line 21 of inductance element 20
Is simply bent at the bending portion 25, so that the trouble of cutting like the inductance element 10 can be omitted.

As mentioned above, although one Example was described, this invention is not limited to this, A various deformation | transformation implementation is possible in the range which does not change the summary.

For example, although a ring-shaped inductance adjustment line 21 is used for the inductance element 20, a rod-shaped inductance adjustment line 1 is used.
Both ends of the inductance adjusting lines 11, 31 may be bent as shown at 25 in FIG. Further, the inductance adjustment line 11 of the inductance element 10 is fixed with the resin 15, but both ends of the inductance adjustment line 11 may be bent.

[Effects of the Invention] The present invention is configured as described above, and has the following effects.

By making the inductance adjustment member a thin wire,
It can be bent easily and can be easily moved to the insertion portion of the core.

Also, a magnetic part that affects the inductance,
Since the adjusting member has a nonmagnetic portion, fine adjustment of inductance can be performed by applying a force to both ends of the adjusting member and moving the adjusting member.

Accordingly, the magnetic wire can be arranged at the bent insertion portion (the center of the magnetic path) such as a toroidal core, so that the application range of the method of inserting the inductance adjusting member can be expanded, and a high-precision inductance can be obtained. Can be obtained.

Next, since both ends of the magnetic wire and the non-magnetic wire can be fixed to the inductance adjustment line, the movement of the inductance adjustment line can be reliably prevented, so that the reliability of the inductance element is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an inductance element using a drum-shaped core of the first embodiment according to the present invention, and FIG. 2 is a diagram relating to an inductance element using a ring-shaped core of the second embodiment. a) is a plan view, and FIG.
3A and FIG. 3B are views corresponding to the EE section showing a modified example of the EE section in FIG. 2, and FIG. 4 is an external view of an inductance adjustment line. 4) shows a first example, FIG. 4 (b) shows a second example, and FIG. 5 (c) shows a third example. FIG. 5 is a cross-sectional view of a conventional example of an inductance element using a drum core. 10 ... Inductance element, 11 ... Inductance adjustment line, 11a ... Line made of magnetic material, 11b ... Line made of non-magnetic material, 13 ... Core, 13a ... Through hole (insertion part), 14 ... …
coil.

Claims (3)

(57) [Claims] 1. An inductance element having a core and a coil, wherein an inductance adjusting member made of a thin wire having a magnetic portion and a non-magnetic portion is arranged in an insertion portion provided at a center portion of the core. An inductance element characterized by being fixed to an end. 2. The inductance element according to claim 1, wherein the insertion portion provided at the center of the core is a through hole provided in the core. 3. The inductance element according to claim 1, wherein said core is formed in a ring shape or a toroidal shape.