JPS6378508A - Laminated core for transformer - Google Patents

Abstract

PURPOSE:To obtain a laminated core proper to the miniaturization and flattening of a transformer by bringing the shapes of magnetic plates to at least two kinds or more of different forms and forming sections shaping the outer side surfaces of each magnetic plate to the same shape. CONSTITUTION:A bobbin 11 on which a coil 12 is wound takes approximately a trapezoid, and an internal core 13a in a laminated core 13 inserted into the bobbin 11 also takes approximately the trapezoid. On the other hand, the upper surface of a side section core 13b is positioned at a section upper than the upper surface of the internal core 13a in the side section core 13b, and the side section core 13b takes a sectional shape forming a right angled triangle in which the upper surface and the side surface approximately cross at a right angle. The internal cores 13a in a pair of the laminated cores 13, 13 are inserted into the hole section of the bobbin 11 on which the coil 12 is wound previously from both sides of the bobbin 11, and each end surface of the internal cores 13a and the side section cores 13b is joined and bonded and fixed. A magnetic path is shaped by the internal cores 13a and side section cores 13b in a pair of laminated cores 13, 13. The outer side surfaces of the laminated cores 13, 13 are formed to a plane.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to a laminated core of a transformer used in electrical and communication equipment.

"Conventional technology" Conventional laminated cores of this type are shown in FIGS. 12 to 14.

The one shown in Fig. 12 is the so-called E-E type core 11 13
The one shown in the figure is a so-called E-I type core 2, and the one shown in FIG. 14 is a so-called F-F type core 3.

These cores 1, 2, and 3 are each formed by laminating an appropriate number of thin magnetic plates into an E shape, a square shape, and an F shape. To assemble a transformer using these cores, you can insert a laminated core made of laminated and glued magnetic plates from both sides of a cylindrical bobbin wrapped with a coil, or Insert the magnetic plates of the above shape into the bobbin one by one and assemble them by gluing them together.

"Problems to be Solved by the Invention" In the conventional laminated core described above, each of the magnetic plates to be laminated has the same shape, so a transformer using this laminated core has a relatively thick shape. (So, it is not necessarily suitable as a circuit component to be installed in a limited space.

That is, the above laminated core is assembled by inserting the inner core A into a bobbin equipped with a coil, but the transformer with this configuration has a built-in volume that takes into account the space between the upper and lower parts of the side core B and the yoke part C. It becomes necessary.

A space between the upper and lower parts of the side core B and the yoke part C is inevitably created as long as the laminated magnetic plates have the same shape, but the present invention effectively utilizes the above space to miniaturize the transformer form and reduce the built-in volume. The purpose of the present invention is to provide a laminated core for a transformer that can save energy.

"Means for Solving the Problems" In order to achieve the above object, the laminated core for a transformer according to the present invention is a laminated core for a transformer formed by laminating an appropriate number of magnetic plates. It is characterized in that it has at least two different shapes, and the portions of each magnetic plate corresponding to the portions forming the outer surface of the laminated core for a transformer have the same shape.

"Function" When the magnetic plates described above are laminated, a laminated core is completed, and the outer surface thereof becomes flat. Further, by changing the shape of each magnetic plate, the outer peripheral surface of the inner core and the inner surface of the side core can be made into a desired shape.

"Example" Hereinafter, the laminated core for a transformer according to the present invention will be specifically described based on the illustrated example.

First, a first embodiment shown in FIGS. 1 to 4 will be described.

As shown in FIG. 1, in the transformer 10, a coil 12 is wound around a bobbin 11, and a pair of laminated cores 13 and 13 according to the present invention are inserted into the holes of the bobbin 11 from both sides. A magnetic path is formed by facing each other.

Further, the lower part of the flange of the bobbin 11 is thickened, and a terminal pin 14 for connection with other electrical parts is implanted therein.

FIG. 2 is a cross-sectional view taken along line P-P in FIG. 8 to be done! The inner core 13a of the core 13 also has a substantially trapezoidal shape.

On the other hand, the side core 13b has a top surface located above the top surface of the inner core 13a, and has a cross-sectional shape of a right triangle in which the top surface and the side surface intersect at a substantially right angle.

The laminated core 13 is shown in FIG. 3, and an exploded perspective view thereof is shown in FIG. 4. As shown in FIG. 4, this laminated core 13 is constructed by laminating an appropriate number of magnetic plates made of silicon steel plates, permalloy, amorphous, or the like. The magnetic plate constituting the inner core 13a is an E-shaped magnetic plate 15 formed in a substantially E-shape, and the central protruding branch 15a at the center of this E-shape is laminated to form the inner core 13a. .

Also, a part of the side core 13b is formed by the side protrusion 15b on the side of this E-shape. Furthermore, a connecting portion 1 that supports the central protrusion 15a and the side protrusion branches 15b is provided.
5C constitutes a part of the yoke portion 13c of the laminated core 13. Then, the width of each of the central protruding branches 15a is made to gradually become smaller as the central protruding plate 15a is located above, so that the cross section of the central protruding branches 15a is approximately trapezoidal when stacked. be.

The magnetic plates that do not constitute the inner core 13a are the U-shaped magnetic plates 16 formed in a substantially U-shape, and the protruding branches 16a at both ends of this U-shape constitute a part of the side core 13b. Together with the side protrusion 15b of the plate 15, it constitutes the entire side core 13b. Further, a part of the yoke portion 13C of the laminated core 13 is constituted by the U-shaped connecting portion 16b, and the above-mentioned E
Together with the connecting portion 15c of the shaped magnetic plate 15, it constitutes the entire yoke portion 13C. Then, the inner edge of the side protrusion 15b of the E-shaped magnetic plate 15 and the inner edge of the protrusion 16a of the U-shaped magnetic plate 16 are gradually shaved down toward the lower magnetic plate, so that these are stacked. The cross section is approximately a right triangle.

To assemble a transformer having the laminated core 13 having the above-described structure, the E-shaped magnetic plate 15 and the U-shaped magnetic plate 16 are laminated and bonded in order.

Note that it is preferable that each end face of the inner core 13a and the side core 13b be polished.

Then, the inner cores 13a- of the pair of laminated cores 13.13 are inserted from both sides of the bobbin 11 into the holes of the bobbin 11 on which the coil 12 has been wound in advance, and the end surfaces of the inner cores 13a and the side cores 13b are joined. and fix with adhesive. Further, a magnetic path is formed by the inner core 13a and side core 13b of the pair of laminated cores 13, 13. Note that the laminated core 13.
The outer surface of 13 is formed into a flat surface.

The laminated core 31 shown in FIG. 5 has a set of two magnetic plates each having a different shape.

That is, E-shaped magnetic plates 17a, 17b, 17c, 17d
, 17e, side protrusion technique of E-shaped magnetic plates 17a and 17b, central protrusion technique of E-shaped magnetic plates 17b and 17c, side protrusion technique of E-shaped magnetic plates 17c and 17d, and E-shaped magnetic plate 17d.
The central projection techniques of 17e and 17e have the same shape.

In addition, U-shaped magnetic plates 18a, 1sb, 18c, 18d,
In 18e, the side protruding branches of the E-shaped magnetic plate 178, the protruding technique of the U-shaped magnetic plate 18a, the protruding techniques of the U-shaped magnetic plates 18b and 18c, and the protruding branches of the U-shaped magnetic plates 18d and 18e have the same shape. has been done.

In this way, in the laminated core 31 in which the shape of the magnetic plates is changed as a set of two, the side part of the inner core 19a and the side core 19b
Although the inner portion changes stepwise, it does not affect the formation of the magnetic path, so such a configuration is acceptable. Similarly, the shape of the magnetic plates can be changed to a set of three magnetic plates.

The laminated core 32 shown in FIG. 6 and FIG.
It is composed of. Of these E-shaped magnetic plates 21 and U-shaped magnetic plates 22, E-shaped magnetic plates 21a, 218, and 2
1b and 21d have a shape between each other, and the U-shaped magnetic plate 2
2a and 22f, 22b and 22e, and 22c and 22d have the same shape.

In this way, the E-shaped magnetic plates 21 of the same shape and the U-shaped magnetic plates 22 of the same shape may be appropriately combined and laminated, and in this case, f of the magnetic plates to be formed! It is possible to reduce the number of types.

The laminated core 33 shown in FIG. 8 has E-shaped magnetic slopes 23a, 2
3b, 23c, 23d, 23e, 23f.

It is composed of 23g, 23h, 23i, 23j and 23k. 23a and 2 of these E-shaped magnetic slopes 23
3k, 23b and 23j, 23c and 23i, 23d and 23
h, 23e, and 23g each have the same shape.

In such a laminated core 33, only the E-shaped magnetic plates 23 need be formed, and the types of E-shaped magnetic plates 23 to be formed can be reduced.

The laminated core 34 shown in FIG. 9 includes an E-shaped magnetic plate 24a,
24 b, 24 c, 24 d, 24 e, 24
f.

It is composed of 24g and 24h. Of these E-type magnetic plates 24, 24a, 24b, 24C124d and 2
4e has the same shape, and the remaining E-shaped magnetic slopes 24 gradually change as they move upward.

Since such a laminated core 34 has a large number of E-shaped magnetic slopes 24 having the same shape, the number of types of E-shaped magnetic plates 24 to be formed is reduced.

The embodiment shown in FIG. 10 is a pot-shaped laminated core 35 having a so-called bot core shape, and a cylindrical peripheral core 25b is provided so as to surround an inner core 25a. In addition,
In the figure, 25c is a lid core, which is bonded to the end surfaces of the inner core 25a and the peripheral core 25b after a coil (not shown) is inserted into the pot-shaped laminated core 35. This pot-shaped laminated core 3
5 can be formed by laminating magnetic plates formed by cutting a pot core along planes parallel to the axial direction.

Note that if these magnetic plates are formed in pairs with the same shape, the number of types of magnetic plates can be reduced.

The laminated core 36 shown in FIG. 11 is made by laminating an E-shaped magnetic plate 26 and a U-shaped magnetic plate 27. This laminated core 3
6 can be composed of E-shaped magnetic plates 26 that all have the same shape and U-shaped magnetic plates 27 that all have the same shape, so the number of shapes of the magnetic plates to be formed is two (reducing the number of manufacturing steps). (
can do.

In addition, in the embodiments shown in FIGS. 1 to 11, in order to simplify the explanation, the number of magnetic plates to be laminated is easily understood, but the number of magnetic plates is usually larger. .

Further, if the number of magnetic plates is increased, the side surface of the inner core and the inner surface of the side core can be made closer to a curved surface, and can be made to be more in line with the inner circumferential surface and outer circumferential surface of the coil.

The magnetic plates forming the laminated core may be sequentially inserted into the holes of the bobbin and then bonded together.

In addition to the above-mentioned E-shaped and U-shaped magnetic plates, the laminated core has
The same structure can be obtained by stacking E-shaped and I-shaped or F-shaped magnetic plates.

"Effects of the Invention" As explained above, according to the thin layer core for a transformer according to the present invention, the shape of each magnetic plate to be laminated can be adjusted to at least two
The parts of each magnetic plate corresponding to the outer surface of the laminated core for the transformer have the same shape, so the outer surface is almost a rectangular parallelepiped like the conventional laminated core. However, the outer peripheral surface of the inner core and the inner surface of the side cores can be formed into any shape. Therefore, the laminated core can be formed to match the shape of the coil, and is suitable for making the transformer smaller and flatter.

Further, since the cross-sectional areas of the inner core and the side cores can be easily changed, they are effective as a laminated core of a transformer to be installed in a predetermined volume part.

[Brief explanation of the drawing]

1 to 4 show a first embodiment, and FIG. 1 shows a transformer having a laminated core according to the present invention.
A cross-sectional view along the Q line, Figure 2 is also P in Figure 1.
3 is a perspective view of the laminated core, FIG. 4 is an exploded perspective view of the same laminated core, FIG. 5 is a front view of the laminated core showing the second embodiment, and FIG. 6 7 shows the third embodiment, FIG. 6 is a plan view of the laminated core, FIG. 7 is a front view of the same laminated core, and FIG. 8 is a front view of the laminated core according to the fourth embodiment. FIG. 9 is a front view of the laminated core according to the fifth embodiment, and the first
0 is a perspective view of the laminated core according to the sixth embodiment, FIG. 11 is a front view of the laminated core according to the seventh embodiment, and FIGS. 12 to 14.
The figure is a perspective view showing a conventional laminated core, and Fig. 12 is an E-E
FIG. 13 shows an E-1 type core, and FIG. 14 shows an F-F type core. 10...Transformer 11...Bobbin 12...Coil 13.31.32.33.34.35.36...Laminated core 13a...Inner core 13b...Side core 13C... Yoke part 15.17.21.23.24.26... E-shaped magnetic plate 16.18.22.27... U-shaped magnetic plate Figure 1, Figure 2. Figure 3 Figure 5 M9 Figure 10 Figure 11

Claims (1)

[Claims] In a laminated core for a transformer formed by laminating an appropriate number of magnetic plates, the magnetic plates have at least two different shapes, and a portion of each magnetic plate forms an outer surface of the laminated core for a transformer. A laminated core for a transformer, characterized in that portions corresponding to the same shape have the same shape.