JPH0460324B2 - - 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 electric wire-wound component is suitable for mass production because the demand for it is extremely large, and miniaturization is an important issue for this type of wire-wound component, which is often used in telecommunications equipment. ing.

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

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 bobbin 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 to the terminal pin 5; ing.

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
There are small transformers with 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-
The accuracy is lower than that of a transformer using an I-type core where each leg does not have a joint surface.

(2) In a transformer whose length and width are approximately 10 mm, each of the left and right legs of cores 1 and ² has 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) There may be resin particles or other dust attached to the cylindrical inner surface of the bobbin 3, and such deposits may be caught between the end surfaces of the center legs by inserting the cores 1 and 2. , the transformer itself may be defective.

(4) A composite transformer is often constructed in order to adjust the 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.

However, in the present invention, in an electric winding component configured to combine a plurality of cores to form a closed magnetic path around the coil, the columnar central core portion and the middle portion are integrally connected by the central core portion. A main core consisting of a plurality of shunt core parts extending perpendicularly from a central core part, and two outer cores connecting the respective shunt core parts on both sides of the main core are provided, and further, A winding part forming a first fitting part into which the central core part of the main body core fits, and a plurality of collar parts forming a second fitting part into which the shunt core part of the main body core fits. Each of the flanges is provided with a bobbin in which a notch is formed that communicates with the first fitting part from the outer end of the collar for guiding the central core part to the first fitting part, and the main core The present invention proposes an electric winding component characterized in that a coil is fitted to a bobbin, a coil is mounted on a bobbin winding section, and then an outer core is fixed to a shunt core section of a main core.

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, schematically showing the coil.

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 the sixth
It is formed as shown in the figure. That is, the main core 6 includes a columnar central core portion 6a and shunt core portions 6b and 6c connected by the central core portion 6a.
The central core portion 6a is formed into an H shape.
are connected to positions closer to one side in the width direction of the shunt core portions 6b, 6c.

The outer cores 7a, 7b are plate-shaped I-shaped cores so that they can be fixed to the tip surfaces of the shunt core parts 6b, 6c on both sides of the central core part 6a. In addition, the above-mentioned main core 6 and outer cores 7a, 7
b is 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, which serves as a fitting part for fitting the central core part 6a of the main body core 6, and a large-walled winding part 8a connected by this winding part 8a. pedestal part 8b and pedestal part 8b
The flange 8c is made upright with notches spaced apart from each other.
A cross section is provided between the base portion 8b and the flange portion 8c, and serves as a fitting portion into which the shunt core portions 6b and 6c of the main body core 6 are fitted. 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 placed on the bobbin 8.
to fit. In this case, the central core part 6a is housed in the winding part 8a of the bobbin 8, and the shunt core part 6b,
6c is placed on the bobbin stand portion 8b and fitted into the stepped portion.

FIG. 5 shows the state assembled in this way, but if there is a risk that the main core 6 will easily separate from the bobbin 8, the bobbin winding portion 8a
Adhesive tape 11 (see FIG. 4) may be wrapped around it. Note that this adhesive tape 11 is preferably electrically insulating.

With the main core 6 fitted to the bobbin 8 in the state shown in FIG. do.

The outer cores 7a, 7b are fixed to the end surfaces of the shunt core parts 6b, 6c after the winding described above, and these shunt core parts 6b, 6c are connected to the outer cores 7a, 7b provided outside the coil 9. and connect them.

In addition, if the horizontal length of the bobbin stand part 8b is made slightly larger than the horizontal length of the shunt core parts 6b and 6c, an L-shaped outer core assembly position can be formed on both sides of the shunt core parts 6b and 6c. is conveniently formed.

The transformer configured as described above has a shunt core section 6.
Bonding surfaces are formed at four locations on both ends of each of b and 6c, but since there are no bonding surfaces in the magnetic paths between the central core portion 6a and the outer cores 7a and 7b, the effect of these bonding surfaces on accuracy is greater than the conventional method described above. The cores 7a and 7b are produced separately from the main core 6 and need only be glued to the shunt core parts 6b and 6c when assembled, so the production of the core or transformer is considerably easier than that of a transformer. It is extremely unlikely that these cores will be damaged in the process.

Further, since the winding portion 8a of the bobbin 8 has a U-shaped cross section, dust etc. adhering to the inside of the winding portion can be easily removed.
Since the leg end surfaces are not joined in a,
Failures due to dust trapped between the end faces of the legs do not occur.

Next, FIG. 8 is a sectional view similar to FIG. 4 showing an embodiment in which the winding portion 8a of the bobbin 8 is modified, and in this embodiment, two parallel plates are connected to both sides of the central core portion 6a. The winding portion 8a is formed by.

In this case, between the two parallel plates is the central core portion 6a.
This is the fitting part of the

In the above embodiment, the coil 9 comes into direct contact with the central core part 6a, so if the main core 6 and outer cores 7a and 7b have low electrical insulation properties, such as manganese-based ferrite materials, conduction between the wires will occur. This may cause a failure, but this problem can be solved by wrapping an electrically insulating detachable tape 11 around the central core portion 6a or by applying an electrically insulating melting material or the like.

Moreover, 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 as any fitting portion such as a U-shaped cross section or an L-shaped cross section.

In the transformers shown in each of the above embodiments, the wire is clamped and wound by the shunt core part 6b or 6c, the bobbin fitting part 8b, and the chuck, but as the transformer becomes smaller, the area of the clamping part decreases. The chuck grip becomes unstable. It is also possible to strengthen the clamping force of the chuck to securely hold it, but if this clamping force is made too strong, the shunt core portion 6b or 6c 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 off from its base to construct 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.

FIG. 12 shows another embodiment in which the present invention is implemented as a composite transformer. In this embodiment, four shunt core sections 13b, 13
main core 13 provided with cores 13c, 13d, and 13e, and the above-mentioned shunt core portions 13b to 13 on both sides of main core 13.
Two outer cores 14a and 14b that commonly connect e.
It is equipped with

Further, the bobbin 15 of this embodiment has a central core portion 1
A winding part 15a into which the wire 3a is fitted, and a stand part 15 provided corresponding to each of the shunt core parts 13b to 13e.
b and a flange portion 15c having a fitting portion for the shunt core portion, and a terminal pin 10 is implanted in each bobbin stand portion 15b.

The rest of the configuration is the same as the transformer shown in FIG.
A composite transformer shown in a vertical cross-sectional view in FIG. 3 is constructed.

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 FIG. 8, and the main core 13 may be provided with a support piece as shown in FIG.

Next, FIGS. 14 to 16 show another embodiment using an H-shaped main core, and in this embodiment, an H-shaped main core 16 and two I-shaped outer cores 17a, 1
7b, and a winding portion 18a having a U-shaped cross section.
The main body core 16 is fitted into a bobbin 18 having a diameter. That is, the bobbin 18
are provided with flange portions 18b, 18c, and a notch 18c is formed in these flange portions 18b, 18c that communicates with the inside of the winding portion 18a, and the main core 16 is inserted through this notch 18c. Winding part 1
8a.

The rest of the structure is almost the same as the embodiment shown in FIG. 3, and after winding, outer cores 17a and 17b are fixed to the tips of shunt core parts 16a and 16b.

As described above, the electrical winding component according to the present invention includes:
After fitting the central core part of the main core to the winding part of the bobbin and the shunt core part to the flange part of the bobbin, the wires are wound to equip the coils, and then the outer core is fixed and each branch is fitted. Since the structure is such that the road core parts are connected,
There are no joint surfaces in the magnetic path of the core legs, reducing the reduction in precision that would occur due to the joint surfaces of each leg, as in conventional transformers.In addition, the outer core can be fixed by simply gluing it from both sides of the main core. This makes it extremely unlikely that the core will be damaged during the production process of the core or electrical winding parts.Furthermore, the winding part of the bobbin can be formed into a mating part of any shape, such as a U-shaped cross section, without having to be cylindrical. This prevents dust adhering to the inside of the winding from getting caught in the end face of the core leg and causing a malfunction.

In particular, in the present invention, a plurality of shunt core sections are commonly connected by two outer cores on both sides of the main core, so that the structure of the composite transformer is simplified and its production is facilitated.

Note that although the above embodiments have been described with respect to a transformer, the present invention can be similarly implemented with respect to other electric winding components.

[Brief explanation of the drawing]

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. Fig. 3 is a perspective view of a transformer using an H-shaped main core, Fig. 4 is a cross-sectional view taken along the line B-B in Fig. 3 showing a simplified coil, and Fig. 5 is a transformer. Fig. 6 is a perspective view of the main core and outer core used in the transformer shown in Fig. 3, Fig. 7 is a perspective view of the bobbin, and Fig. 8 shows a modified example of the bobbin. 4 is a cross-sectional view similar to that shown in FIG. 4, FIG. 9 is a perspective view of the main core integrally formed with a support piece for winding, and FIG. 10 is a state in which the main core shown in FIG. 9 is fitted into a bobbin. FIG. 11 is a vertical sectional view of a composite transformer using a main core with a support piece, FIG. 12 is a perspective view showing the production process of the composite transformer, and FIG. 13 is the composite transformer shown in FIG. 12. FIG. 14 is a perspective view showing another embodiment of the transformer using an H-shaped main core, FIG. 15 is a cross-sectional view of the transformer shown in FIG. 14,
FIG. 16 is a perspective view showing the core and bobbin of the transformer shown in FIG. 14. 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, 13...Main core, 13a...
Central core part, 13b to 13e...Shunt core part, 1
4a, 14b...outer core, 15...bobbin, 16
...Main core, 16a, 16b...Shunt core part,
17a, 17b...outer core, 18...bobbin.

Claims (1)

[Claims] 1. In an electrical winding component configured to combine multiple cores to form a closed magnetic path around the coil, the columnar central core portion and the middle are integrally connected by the central core portion, and the central core portion is orthogonal to the central core portion. A main core consisting of a plurality of shunt core sections extending so as to extend, and two outer cores connecting the respective shunt core sections on both sides of the main core, and a center core of the main core. It has a winding portion forming a first fitting portion into which the core portion is fitted, and a plurality of collar portions forming a second fitting portion into which the shunt core portion of the main core is fitted; Each flange is provided with a bobbin in which a notch is formed that communicates with the first fitting part from the outer end of the flange for guiding the central core part to the first fitting part, and the main core is fitted to the bobbin. An electric winding component characterized in that the bobbin winding section is equipped with a coil after the coil is attached to the bobbin winding section, and then the outer core is fixed to the shunt core section of the main core.