JPH0648651B2 - Electric winding parts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a small electric winding component,
For example, it relates to electric winding parts such as small transformers and choke coils.

[0002]

2. Description of the Related Art Electric winding parts of this type are extremely demanded and are therefore suitable for mass production, and the winding parts of this kind which are often used in telecommunications equipment can be miniaturized. It has become an important issue.

FIG. 7 is a perspective view of a small transformer showing a conventional example, and FIG. 8 is a vertical sectional view of the transformer taken along line AA in FIG. In these drawings,
Each of 1 and 2 is an E-shaped core of the same shape made of a ferrite material, 3 is an electrically insulating bobbin having flanges at both ends of a tubular winding portion, 4 is a primary wound around the bobbin 3, A coil 5 composed of a secondary coil or a tertiary coil is a terminal pin implanted in the collar portion of the bobbin 3, and a coil end is fixed to the terminal pin 5.

In the above transformer, the bobbin 3 is wound and the coil 4 is mounted on the bobbin 3. After that, the cores 1 and 2 are inserted from the vertical direction of the bobbin 3 and the leg end surfaces of the joined cores 1 and 2 are fixed. I am allowed. There are various sizes of such transformers, but in the case of a small-sized transformer, the length and width are 1
There is a transformer around 0 mm.

[0005]

The transformers described above are convenient for firing the cores because it is sufficient to prepare cores 1 and 2 of the same shape. However, the following drawbacks are also encountered. I have it.

(1) Since the end surfaces of the legs of the cores 1 and 2 are adhered to each other, a joining surface is formed in the magnetic paths of the central leg and the left and right legs.
-The accuracy is lower than that of a transformer using an I-type core that does not have a joint surface on each leg.

(2) In a transformer having a length of about 10 mm in length and width, each of the left and right legs of the cores 1 and 2 is 4.8 ×.
Since the cross-sectional area is as small as 1.2 mm ² , these left and right legs may be damaged during the core or transformer production process.

(3) A resin piece or other dust may adhere to the inner surface of the bobbin 3 in a cylindrical shape, and such an adhered object is caught between the end surfaces of the central leg when the cores 1 and 2 are inserted. In rare cases, the transformer itself may be defective.

(4) A composite transformer is often used in order to save the built-in area, but it is difficult to construct a composite transformer by using the E-shaped cores 1 and 2 described above.

The present invention was developed with the main purpose of solving the above-mentioned various drawbacks, but it is sufficiently effective even if it is applied to an electric winding component other than a transformer.

[0011]

In order to achieve the above object, according to the present invention, in an electric winding component having a structure in which a plurality of cores are combined to form a closed magnetic circuit around a coil, a columnar center forming a winding portion is formed. A main core composed of a plurality of shunt cores that are integrally connected to the core and the middle by the central core and extend orthogonally to the central core, and the cores on both sides of the main core. Connecting the road cores 2
Two outer cores are provided, and a plurality of terminal pin fixing plates each having a fitting portion to be fitted to the shunt core portion of the main body core and a cutout portion to guide the central core portion to substantially the center are provided.
An electric winding characterized in that the terminal pin fixing plate is fitted and fixed to the shunt core part of the main core, the central core part is equipped with a coil, and then the outer core is fixed to the shunt core part. Propose line parts.

[0012]

Function: The fitting portion of the terminal pin fixing plate is fitted to each shunt core portion of the main core, and each terminal pin fixing plate is fixed to each shunt core portion. After that, a coil is provided by winding around the central core portion of the main core, and then the outer core is fixed so as to connect the shunt core portions.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of a transformer showing a basic example of the present invention, and FIG. 2 is a simplified view of a coil BB on FIG.
It is a line sectional view.

In these figures, 6 is an H-shaped main core, 7a and 7b are I-shaped outer cores, 8 is a bobbin, 9 is a coil, and 10 is a terminal pin. The main core 6 and the outer cores 7a and 7b described above are formed as shown in FIG. That is, the main core 6 is formed in an H shape with the central core portion 6a forming the winding portion and the shunt core portions 6b and 6c connected by the central core portion 6a, and the central core portion 6a is The shunt core portions 6b and 6c are connected to one side in the width direction.

The outer cores 7a and 7b are plate-shaped I-shaped cores so that they can be fixed to the tip surfaces of the shunt core portions 6b and 6c on both sides of the central core portion 6a. In addition,
The main core 6 and the outer cores 7a and 7b described above are formed by firing a ferrite material.

The bobbin 8 described above is formed as shown in FIG. That is, the bobbin 8 is provided with a winding portion 8a having a U-shaped cross section, a thick-walled base portion 8b connected by the winding portion 8a, and a notched portion having an interval L from the base portion 8b so as to stand upright. It is formed by the portion 8c and the base portion 8b and the collar portion 8
A stepped portion which is a fitting portion of the shunt core portions 6b and 6c of the main core 6 is provided between the stepped portion and c. The bobbin 8 can be integrally formed of a synthetic resin material which is an electric insulating material.

Although the above-mentioned terminal pins 10 are implanted in the bobbin base portion 8b, the number of pins and the pin shape can be arbitrarily determined, and these terminal pins 10 are as shown by a phantom line in FIG. It may be projected laterally.

When winding, the main core 6 is fitted to the bobbin 8. In this case, the central core portion 6a is incorporated in the winding portion 8a of the bobbin 8 and the shunt core portions 6b and 6c are placed on the bobbin base portion 8b. FIG. 3 shows a state in which the main core 6 and the bobbin 8 can be easily separated from the bobbin 8, but the adhesive tape 11 is provided around the bobbin winding portion 8a (see FIG. 2). Can be wrapped around. The adhesive tape 11 is preferably electrically insulating. In the state shown in FIG. 3 in which the main core 6 is fitted to the bobbin 8, the bobbin winding portion 8a is wound and the coil 9 is provided, and the coil end is fixed to the terminal pin 10 by soldering means or the like. . The outer cores 7a and 7b are fixed to the tip surfaces of the shunt core portions 6b and 6c after the above-mentioned windings, and these shunt core portions 6b and 6c are connected by the outer cores 7a and 7b provided outside the coil 9. Let

If the lateral length of the bobbin base portion 8b is made slightly larger than the lateral length of the shunt core portions 6b and 6c, an L-shaped outer portion is formed on both sides of the shunt core portions 6b and 6c. It is convenient because the core mounting position is formed.

In the transformer constructed as described above, bonding surfaces are formed at four positions on both ends of each of the shunt core parts 6b and 6c, but the magnetic paths between the central core part 6a and the outer cores 7a and 7b have no bonding surfaces. Therefore, the influence of this joint surface on accuracy is considerably smaller than that of the above-mentioned conventional transformer, and the outer cores 7a and 7b are produced separately from the main core 6, and when assembled, the shunt core portion 6b, Since it is only necessary to adhere to 6c, it is extremely unlikely to damage these cores during the production process of the cores or the transformer. Further, since the winding portion 8a of the bobbin 8 has a U-shaped cross section, dust and the like adhering to the inside of the winding portion can be easily removed, and the leg end surfaces are not joined in the winding portion 8a. Therefore, there is no failure due to dust caught between the end faces of the legs.

Next, FIG. 6 shows an embodiment of the present invention shown in FIG.
It is a similar sectional view, in this embodiment, the winding portion 8a is removed, the bobbin base portion 8b and the collar portion 8c are formed as terminal pin fixing plates, and these are bonded to the shunt core portions 6b and 6c. Other configurations are the same as those of the basic example described above, and after winding, the outer cores 7a, 7c are attached to the tips of the shunt cores 6b, 6c.
Fix b.

In the above embodiment, the coil 9 has the central core portion 6
Since the main core 6 and the outer cores 7a and 7b have a low electrical insulating property such as a manganese-based ferrite material, they may cause a failure due to line continuity. This problem can be solved by wrapping an electrically insulating adhesive tape 11 around the sheet, or by coating an electrically insulating melt material or the like. Further, if a cement wire or the like is used as the winding wire, it is not necessary to apply the above-mentioned electrically insulating melt material.

Although one embodiment of the present invention has been described above, the main core 6 is provided with a similar shunt core portion between the shunt core portions 6b and 6c, and a terminal is fixed to each shunt core portion. The plate may be fixed, or a so-called vertical transformer in which the central core portion 6a of the main core 6 is vertical may be similarly configured.

[0024]

As described above, in the electric winding component according to the present invention, the main core is provided by the central core portion forming the winding portion and the plurality of shunt core portions orthogonal to the central core portion. Since the terminal pin fixing plate is fixed to each shunt core part, the coil wound around the central core part is installed, and then the outer core is fixed so as to connect between the shunt core parts. Since there is no joint surface in the magnetic path of, the decrease in accuracy caused by the joint surface of each leg like a conventional transformer is mitigated, and the outer core can be bonded and fixed from both sides of the main core. Also, the core is extremely unlikely to be damaged in the production process of electric winding parts, and further, dust adhering to the inside of the winding part will not be caught in the leg end faces of the core leg and cause a failure. .

[Brief description of drawings]

FIG. 1 is a perspective view of a transformer showing a basic example of the present invention using an H type main core.

FIG. 2 is a cross-sectional view taken along line BB in FIG. 1 showing a coil in a simplified manner.

FIG. 3 is an exploded perspective view showing a production process of the transformer of FIG.

4 is a perspective view of a main core and an outer core used in the transformer shown in FIG.

5 is a bobbin perspective view of the transformer shown in FIG. 1. FIG.

FIG. 6 is a sectional view similar to FIG. 2, showing an embodiment of the present invention.

FIG. 7 is a perspective view of a conventional transformer.

8 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 6 Main core 6a Central core part 6b, 6c Shunt core part 7a, 7b Outer core 8 Bobbin 9 Coil 10 Terminal pin 12 Coil

Claims (1)

[Claims] 1. An electric winding component having a structure in which a closed magnetic circuit is formed around a coil by combining a plurality of cores, and a columnar central core portion and a middle portion forming a winding portion are integrally connected by the central core portion. A main core consisting of a plurality of shunt cores extending orthogonally from the lever central core and two outer cores connecting the shunt cores on both sides of the main core are provided. Further, a plurality of terminal pin fixing plates having a fitting portion to be fitted into the shunt core portion of the main core and a cutout portion for guiding the central core portion to substantially the center are provided, and the terminal pin fixing plate is used as the main core. An electric winding component, characterized in that the coil is mounted on the central core portion after being fitted and fixed to the shunt core portion, and then the outer core is fixed to the shunt core portion.