JPH0517687B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to small electrical winding components, such as small transformers and chiyoke coils.

This type of electrical winding component is suitable for mass production as the demand is extremely large, and miniaturization of the form is an important issue for this type of winding component, which is often used in telecommunications equipment. ing.

FIG. 1 is a perspective view of a conventional small transformer, and FIG. 2 is a longitudinal sectional view of the transformer taken along line A--A in FIG. 1.

In these drawings, each of 1 and 2 is an E-shaped core of the same shape made of ferrite material, 3 is an electrically insulating bohin having flanges at both ends of a cylindrical winding part,
4 is a coil consisting of a primary, secondary or tertiary coil wound around the bobbin 3; 5 is a terminal pin implanted in the flange of the bobbin 3;
The end of the coil is fixed.

The above transformer is wound around bobbin 3 and coil 4
is mounted on the bobbin 3, and then the cores 1 and 2 are inserted from above and below the bobbin 3, and the end surfaces of the legs of the joined cores 1 and 2 are fixed.

The sizes of such transformers vary, but
Small transformers have a length and width of around 10mm.

Now, since the above-mentioned transformer only needs to prepare cores 1 and 2 of the same shape, it is convenient for firing the cores, but it also has the following drawbacks.

(1) Due to the relationship between adhering the end surfaces of each leg of cores 1 and 2,
A joint surface is created in the magnetic path of the center leg and left and right legs, and E-
Accuracy is lower than that of a transformer that uses a type 1 core and does not have a joint surface on each leg.

(2) In a transformer whose vertical and horizontal lengths are approximately 10 mm, the left and right legs of cores 1 and ² each have a very small cross-sectional area of approximately 4.8 x 1.2 mm2, so in the production process of the core or transformer, These left and right legs may be damaged.

(3) Resin pieces and other dust may adhere to the cylindrical inner surface of the bobbin 3, and such adhesion may become trapped between the end faces of the center legs when the cores 1 and 2 are inserted, and the transformer The product itself may be defective.

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

Although the present invention was developed primarily to solve the above-mentioned drawbacks, it is also sufficiently effective when applied to electrical winding components other than transformers.

The present invention provides an electric winding component configured by combining two cores to form a closed magnetic path in a coil.
A main core consisting of a plurality of rectangular branch core parts each having a central core part having a quadrilateral cross section and a plurality of rectangular branch core parts connected by the central core part and extending perpendicularly from the central core part; It has a flange part connected by a winding part such as a concave cross section into which the central core part of the main core fits, and the flange part has a flange part connected to the winding part from outside the flange so as to guide the central core part to the winding part. A bobbin is provided with a notch that communicates with the winding part, and a main core is assembled to this bobbin, and after winding the wire around the winding part to form a coil, We propose an electrical winding component characterized by being composed of a plate-shaped outer core that connects one side of a shunt core part in common.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a perspective view of a transformer showing the first embodiment of the present invention, and FIG. 4 is a sectional view taken along the line B--B in FIG. 3, showing a simplified coil.

In these drawings, 6 is a main core formed in an H shape, 7 is an outer core formed in a rectangular plate shape, 8 is a bobbin, 9 is a coil, and 10 is a terminal pin.

The main core 6 and outer core 7 described above are formed as shown in FIG. That is, the main core 6 includes a central core portion 6a forming a winding portion, and a central core portion 6a that forms a winding portion.
The shunt core portions 6b and 6c are connected by a line a to form an H-shape, and the central core portion 6a is connected to one side of the shunt core portions 6b and 6c in the width direction. be.

The outer core 7 is a rectangular thin plate core so that it can be fixed to the upper surface of the shunt core portions 6b, 6c.

The main core 6 and the outer core 7 described above are formed by firing a ferrite material.

The bobbin 8 described above is formed as shown in FIG. That is, this bobbin 8 includes a winding part 8a having a U-shaped cross section, a thick base part 8b connected by the winding part 8a, and a collar part standing upright at a distance l from the base part 8b. 8c, and a stepped portion is provided between the base portion 8b and the collar portion 8c. This bobbin 8 can be integrally formed of a synthetic resin material that is an electrically insulating material.

The terminal pins 10 described above are implanted in the bobbin base portion 8b, but the number and shape of the pins can be determined arbitrarily, and these terminal pins 10 can be arranged as shown with temporary lines in FIG. It may also be made to protrude laterally. When winding, the main core 6 is fitted onto the bobbin 8. In this case, the central core portion 6a
are placed inside the winding portion 8a of the bobbin 8, and the shunt core portions 6b, 6c are placed on the bobbin stand portion 8b. If there is a possibility that the main core 6 will easily separate from the bobbin 8 in this fitted state, an adhesive tape 11 (see FIG. 4) may be wrapped around the bobbin winding portion 8a. Note that this adhesive tape 11 is preferably electrically insulating.

With the main body core 6 fitted onto the bobbin 8, the bobbin winding portion 8a is wound with a coil 9, and the end of the coil is fixed to the terminal pin 10 by soldering means or the like.

The outer core 7 has a shunt core section 6 after the winding described above.
b, 6c, and these shunt core parts 6
b and 6c are bridged by an outer core 7 provided outside the coil 9.

In the transformer configured as described above, the shunt core section 6
There are bonding surfaces at two places on the upper surface of each of b and 6c, but there is no bonding surface in the magnetic path between the central core part 6a and the outer core 7, and there are two bonding surfaces between the main core 6 and the outer core 7. Therefore, the effect of this joint surface on accuracy is very small compared to the conventional transformer described above.In addition, the outer core 7 is produced separately from the main core 6, and when assembled, the shunt core part 6
Since it is only necessary to bond to the cores b and 6c, it is extremely unlikely that the core will be damaged during the production process of the core or transformer. Furthermore, the winding portion 8a of the bobbin 8
Since it has a U-shaped cross section, dust adhering to the inside of the winding can be easily removed.
Since the end faces of the legs are not joined within the winding portion 8a, failures due to dust or the like caught between the end faces of the legs do not occur.

Next, FIGS. 7 and 8 show the winding portion 8 of the bobbin 8.
7 is a cross-sectional view similar to FIG. 4 showing a modified embodiment of FIG. 7a; in the embodiment of FIG. In the embodiment shown in FIG. 8, the winding portion 8a is removed and the bobbin stand portion 8b and collar portion 8c are bonded to the shunt core portions 6b, 6c.

In the above embodiment, the coil 9 comes into direct contact with the central core part 6a, so if the main core 6 and the outer core 7 have low electrical insulation properties, such as those made of manganese-based ferrite, failures due to conduction between the lines may occur. However, this problem can be solved by wrapping an electrically insulating adhesive tape 11 around the central core portion 6a or by applying an electrically insulating melting material or the like. Further, if cement wire or the like is used as the winding wire, there is no need to apply the electrically insulating melt material as described above.

As can be seen from the above, the bobbin winding portion 8a can be formed in any desired shape, such as a U-shaped cross section or an L-shaped cross section.

In the transformers shown in the above embodiments, the shunt core part 6b or 6c and the bobbin stand part 8b are held together by chucks for winding, but as the form of the transformer becomes smaller, the area of the holding part becomes smaller. The chuck grip becomes unstable. In addition, it is possible to strengthen the clamping force of the chuck to securely hold it, but if this clamping force is too strong, the shunt core portion 6b or
c may be damaged.

Therefore, it is effective to provide the main core 6 with a supporting piece 6d as shown in FIG. 9, and to wind the supporting piece 6d by holding the supporting piece 6d between chucks.

The support piece 6d is formed integrally with the main core 6 so as to protrude on an extension of the central core portion 6a, and when the main core 6 is fitted onto the bobbin 8, the state shown in FIG. 10 is obtained.

The support piece 6d is wound and then cut from its base to form a transformer as shown in FIG. 3.

Moreover, the support piece 6d may be equipped with a coil to form a composite transformer without being cut off. That is, if the support piece 6d is equipped with the coil 12 which has been pre-wound around a bobbin, a composite transformer as shown in FIG. 11 will be obtained. In addition, the outer core 7 of this composite transformer may be extended as shown by the tentative line in the figure.

FIG. 12 shows another embodiment in which the present invention is implemented as a composite transformer. In this embodiment, five shunt core sections 13b, 13
Main body core 1 provided with c, 13d, 13e, 13f
3, and a rectangular plate-shaped outer core 14 that is fixed to the upper surface of the shunt core portions 13b to 13f and commonly connects the shunt core portions. Further, the bobbin 15 of this embodiment has a winding part 15a into which the central core part 13a is fitted, and each branch core part 13b to
13f, and a flanged base part 15b provided corresponding to the bobbin base part 15b, and a terminal pin 10 is implanted in each bobbin base part 15b.

The rest of the configuration is the same as the transformer shown in FIG. 3, and if the outer core 14 is fixed after winding and equipping the coil 9, the transformer shown in FIG. A transformer is configured.

As described above, according to the present invention, not only the configuration of the composite transformer becomes simple, but also the number of transformers to be integrally configured can be arbitrarily determined by providing a shunt core portion as necessary.

The bobbin 15 of the composite transformer may be deformed as shown in FIGS. 7 and 8, and the main core 13 may be provided with a support piece as shown in FIG. 9. Next, FIGS. 14 to 16 show other embodiments of a transformer using an H-shaped main core.
In this embodiment, the shunt core portion 16 of the main core 16
A notch 16d is provided in b and 16c, and a part of the bobbin stand 17b is fitted into the notch 16d.The other configuration is the same as the embodiment shown in FIG. 3, with 9 being a coil and 10 being a terminal. Pin, 16a is central core part, 17 is bobbin, 17
A indicates a winding portion, and 18 indicates an outer core. When the shape of the transformer becomes smaller, the area of the bobbin base portion 17b in which the terminal pins 10 are implanted becomes narrower, making it difficult to implant the required number of terminal pins 10. For this reason, in the embodiment described above, a part of the bobbin stand portion 17b is fitted into the notches 16d of the shunt core portions 16b, 16c to enlarge the area where the terminal pins 10 are installed.

As described above, the electrical winding component according to the present invention has a main core formed by a central core portion constituting the winding component and a plurality of shunt core portions orthogonal to this central core portion, and after winding, the Since the structure is such that a closed magnetic path is formed by the outer core fixed to one side of the shunt core part, no bonding surface is formed in the magnetic path within the core legs.
In addition, the number of joints between the main core and the outer core is reduced; for example, an H-shaped main core is joined to the outer core at two places, which makes it difficult to connect each leg as in conventional transformers. The reduction in accuracy caused by the joint surfaces is sufficiently reduced. In addition, because the outer core can be formed as a thin plate core, and the bobbin and main core are produced separately, and the main core is assembled to the bobbin and wound, thin bobbins can be mass-produced with high precision, and the bobbin Since the wall thickness of the transformer can be made thinner, the transformer form can be made smaller, and furthermore, the bobbin flange and the shunt core can be held together by a chuck, etc., for winding.
The clamping becomes reliable, and a small transformer that is easy to wind and suitable for mass production can be provided.

Furthermore, since the outer core is in the form of a wide plate and only needs to be adhered to the main core, damage to the core during the production process of the core or electrical winding components is extremely rare.

On the other hand, in the present invention, since the end surfaces of the core legs are not joined at the winding section of the bobbin, there is no possibility that dust adhering to the winding section will be caught between the end surfaces of the core legs and cause a malfunction. .

In particular, in the present invention, since a plurality of shunt core sections are commonly bridged by one plate-shaped outer core, the structure of the composite transformer becomes simple and its production becomes easy.

Although the above embodiments have been described with respect to a transformer, the present invention can be implemented in the same way with other electric winding parts, and the main core and the outer core are not limited to ferrite cores, but may be laminated cores.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional transformer, FIG. 2 is a vertical sectional view of the transformer taken along line A-A in FIG. 3 is a perspective view of a transformer using an H-shaped main core, FIG. 4 is a sectional view taken along line B-B in FIG. Fig. 3 is a perspective view of the main core and outer core used in the transformer, Fig. 6 is a perspective view of the bobbin, Figs. 7 and 8 are sectional views similar to Fig. 4 showing modifications of the bobbin, and Fig. FIG. 9 is a perspective view of a main core with an integral support piece for winding, FIG. 10 is a perspective view showing the main core shown in FIG. 9 fitted into a bobbin,
Fig. 11 is a vertical cross-section of a composite transformer using a main core with a supporting piece, Fig. 12 is a perspective view showing the production process of the composite transformer, and Fig. 13 is a longitudinal cross-section of the composite transformer shown in Fig. 12. , FIG. 14 is a vertical cross-sectional view showing another embodiment of a transformer using an H-shaped main core, FIG. 15 is a cross-sectional view taken along the line CC in FIG. 14, and FIG. FIG. 3 is a perspective view showing the core and bobbin of the transformer. 6...Main core, 6a...Central core part, 6b,
6c...Shunt core part, 7...Outer core, 8...Bobbin, 9...Coil, 10...Terminal pin, 12...
Coil, 13...Main core, 13a...Central core portion, 13b to 13f...Shunt core portion, 14...Outer core, 15...Bobbin, 16...Main core, 16
a... Central core part, 16b, 16c... Shunt core part, 16d... Notch, 17... Bobbin, 18
...outer core.

Claims (1)

[Claims] 1. In an electric winding component configured to combine two cores to form a closed magnetic path in the coil, the central core part and the middle part having a quadrilateral cross section are connected by the central core part, and the central core part and the middle part are connected orthogonally from this central core part. It has a main core consisting of a plurality of rectangular shunt core parts extending so as to extend, and a flange part connected by a winding part such as a concave cross section into which the central core part of the main core fits, The flange includes a bobbin provided with a notch that communicates with the winding from outside the flange so as to guide the central core to the winding. An electric winding comprising a plate-shaped outer core that commonly connects one side of the plurality of shunt core parts in a direction perpendicular to the central core part after winding to form a coil. wire parts.