JPH07263249A - Transformer - Google Patents

Abstract

PURPOSE:To prevent irregularity, in the performance of a transformer, which is caused by a gap produced between core materials which are combined so as to constitute a core for a transformer. CONSTITUTION:A core 10 for a transformer which is constituted so as to be provided with a coil 40 is constituted by combining one pair of core materials 11, 11. The pair of core materials 11, 11 are assembled by an attachment plate 30 which is attached and mounted acorss side faces 11c, 11c situated on both sides of mutual bonding edges of the pair of core materials 11, 11 and which is bonded to the side faces 11c, 11c by an adhesive material 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used for various purposes, and more particularly to a transformer having a pair of magnetic core members which are combined with each other to form a magnetic core.

[0002]

2. Description of the Related Art For the purpose of facilitating the work of installing a coil in a magnetic core of a transformer, as shown in FIG. 4, for example, a combination of a pair of E-shaped magnetic core members 101, 101 is used. A technique of forming a magnetic core from a pair of magnetic core materials, such as the EE type magnetic core 100, is used.

According to this, for example, a cylindrical bobbin 301
The coil 300 is separately wound around the bobbin 301.
The core material 101, 1
Since the magnetic core 100 can be configured by assembling 01, the manufacturing of the transformer becomes extremely easy as compared with the case where the integrated magnetic core is provided with the coil.

The pair of magnetic core members 101, 101 constituting the magnetic core 100 are the same as the pair of magnetic core members 101, 10.
1 are the end faces 103a of their outer legs 103, 103,
After the 103a is combined so as to be in close contact with the end faces 103a, 103a of the outer legs 103, 103 of the other magnetic core material 101, the tape is wound around the peripheral side surfaces of the pair of magnetic core materials 101, 101. Pair of magnetic core materials 1
01, 101 from the outside of the outer foot 103
Was attached and both magnetic core materials 101, 101 were adhered to each other to be assembled.

[0005]

However, the assembling method of winding the tape around the peripheral side surfaces of the pair of magnetic core members 101, 101 requires a special manufacturing process for winding the tape, and therefore the manufacturing cost of this type of transformer is high. From the standpoint of cost reduction, etc., it was not always an appropriate assembly method.

Further, as shown in FIG. 4, when the adhesive agent 200 is simply applied to the joint edge F of the outer legs 103, 103 of the pair of magnetic core materials 101, 101, both magnetic core materials 1
Since Nos. 01 and 101 are assembled only in the portion to which the adhesive 200 is applied, it is difficult to secure the assembled state. Therefore, the assembled state due to this adhesion is loosened, and the end faces 103a, 1 of the outer legs 103, 103 are
There is an inconvenience that a gap is generated between 03a.

Further, in particular, as shown in the lower diagram of FIG. 4, which is an enlarged view of the A portion shown in the upper diagram of FIG. 4, the outer edges 103 and 103 are simply bonded to the joint edge F. When the agent 200 is applied, the joined outer foot 10
It often happens that the adhesive before curing is soaked between the end faces 103a and 103a of the outer legs 103 and 103 due to the capillary phenomenon.
However, there is a problem that a gap is generated between the end surfaces 103a and 103a.

As described above, the magnetic core 10 of the transformer is
When a gap is formed between the joint edges F of the magnetic core members 101, 101 forming 0, there is a disadvantage that it is difficult to maintain the inductance of the transformer at a constant value. That is, as shown in FIG. 3, the inductance (L) changes with the change in the gap (t) generated between the joint edges F of the magnetic core members 101, 101.
Is known to decrease as the gap (t) increases. This inductance (L)
As shown in FIG. 3, the change of becomes more severe as the gap (t) becomes closer to zero.

Therefore, when assembling the magnetic core materials 101, 101 constituting the magnetic core 100 of the transformer, the end faces 103a of the outer legs 103, 103 of the magnetic core materials 101, 101,
The conventional assembling method in which a large amount of gap is formed between the 103a is, even if such a gap is extremely small, causes a large variation in the inductance as described above. There has been a strong demand for improvement from the viewpoint of preventing variations.

Therefore, the present invention prevents, as much as possible, a situation in which a gap is formed between the magnetic core materials that are combined to form the magnetic core of the transformer, that is, variations in the performance of the transformer due to such a gap. The purpose is to prevent.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a magnetic core 10 of a transformer including a coil 40 is constructed by combining a pair of magnetic core materials 11 and 11. A pair of magnetic core materials 11, 11,
The pair of magnetic core members 11, excluding the mounting portion of the coil 40,
11 The pair of magnetic cores 11 located on both sides of the mutual joining edge F are mounted over the side surfaces 11c, 11c of the pair of magnetic core materials 11, 11,
Moreover, the transformer is constructed by attaching the side plates 11c, 11c by the attachment plate 30 adhered by the adhesive 50.

[0012]

According to the present invention, since the magnetic core 10 of the transformer including the coil 40 is composed of the pair of magnetic core members 11 and 11, the coil 40 can be easily mounted on the coil mounting portion of the transformer. It

Further, the pair of magnetic core members 11, 11 are provided between the side faces 11c, 11c of the pair of magnetic core members 11, 11 which are located on both sides of the joint edge F of the pair of magnetic core members 11, 11. Since the attachment plate 30 attached to the side surfaces 11c and 11c is adhered to the side surfaces 11c and 11c with the adhesive 50, the assembled state of the pair of magnetic core materials 11 and 11 can be stably maintained.

Further, the attachment plate 30 and the pair of magnetic core members 1
1, 11 between the side faces 11c, 11c of the pair of magnetic core members 11, 11 located on both sides of the joint edge F of each other, the attachment plate 30 is attached to the side faces 11c, 11 of the pair of magnetic core members 11, 11.
The adhesive 50 to be adhered to c can be thinly stretched.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of the transformer according to the present invention will be described below with reference to FIGS. Note that FIG.
2 shows the overall structure of the transformer according to this embodiment.

As shown in FIG. 1, the transformer according to this embodiment is a so-called EE type magnetic core 10 which is constructed by combining a pair of E-shaped magnetic core members 11 and 11.
A cylindrical bobbin 20 having a coil 40 wound around its outer circumference is fitted in the portions 1a and 11a. Note that the reference numeral 21 in the figure denotes a terminal.

A pair of E-shaped magnetic core members 11, 11
Is the end surface 11a 'of the middle foot 11a and the middle foot 11a.
End faces 11 of the outer legs 11b, 11b located on both sides of the
b ′ and 11b ′ are replaced by the middle foot 1 of the other pair of magnetic cores 11a.
The end surface 1a of 1a and the end surface 1 of the outer legs 11b, 11b
It is assembled in close contact with 1b 'and 11b'.

In this way, the outer legs 11b, 1
In a state in which the end faces 11b ', 11b' of 1b are in close contact with each other, the attachment plate 30 is adhered to the side faces 11c, 11c of the outer legs 11b, 11b that do not face the middle leg 11a, and the pair of magnetic core members 11, 11 is assembled. That is,
The joining edge F of the pair of magnetic core members 11, 11 to each other, that is, the end faces 11b ', 11b' of the outer legs 11b, 11b.
By attaching and adhering the attachment plate 30 so as to cover the side surfaces 11c and 11c of the pair of magnetic core members 11 and 11 located on both sides of the edge, the pair of magnetic core members 11 and 11 are attached.
Attaches the bobbin 20 through the coil 40 to the midfoot 1
It is assembled in the state of being fitted into 1a to form a so-called EE type magnetic core.

By the attachment and adhesion of the attachment plate 30, the pair of magnetic core members 11 and 11 are positioned on both sides of the joint edge F of both the magnetic core members 11 and 11 via the attachment plate 30. Since the side surfaces 11c and 11c are fixed to the other magnetic core 11 forming a pair, the assembled state of the pair of magnetic core members 11 and 11 is sufficiently secured. Therefore, after the pair of magnetic core members 11, 11 are assembled, the assembled state is loosened and the outer legs 11b, 1
The gap itself between the end faces 11b 'and 11b' of 1b can be sufficiently prevented. The attachment plate 30 has the joint edge F.
11c, 11c of the outer legs 11b, 11b on both sides of the
However, it is not limited to the shape and size shown in this embodiment. For example, the outer legs 11b and 11 of the pair of magnetic core members 11 and 11 are configured to more firmly secure the assembled state of the pair of magnetic core members 11 and 11.
The attachment plate 30 may be configured to have a length extending between the base portions of b, and the outer legs 11b, 11 may be formed on both sides of the joint edge F.
The outer legs 11 of the pair of magnetic core members 11, 11 are arranged in parallel with a plurality of attachment plates having a length attached to the side faces 11c, 11c of b.
You may attach and adhere to the side surfaces 11c and 11c of b and 11b. Further, for example, when the outer legs 11b, 11b are columnar, the attachment plate 3 is arranged along the arc of the column.
It is also possible to bend 0 to carry out the attachment and the adhesion.

By applying the attachment plate 30, the adhesive 50 is attached to the side face 1 of the attachment plate 30 and the magnetic core members 11, 11.
It becomes possible to thinly extend between 1c and 11c, and the curing of the adhesive 50 can be accelerated. As a result, the adhesive 50 before curing is caused by the capillary phenomenon to cause the pair of magnetic core members 1
The pair of magnetic core materials 1 are soaked between the joining edges F of Nos. 1 and 11.
End faces 11b 'of the outer legs 11b, 11b of 1, 11
A situation in which a gap is formed between 1b 'is less likely to occur.

In order to further prevent such an adhesive from seeping into the space between the joint edges F, an adhesive for which so-called quick-drying can be expected relatively, for example, a heavy / condensation type adhesive or a solvent type adhesive. It is preferable that the attachment plate 30 is adhered by using an agent, a so-called two-liquid type adhesive which is cured and adhered by reacting with two liquids.

In addition to the embodiment described above, a splint plate is provided so as to extend over both side surfaces of the joining edge of the E-shaped magnetic core material forming the so-called EI type magnetic core and the I-shaped magnetic core material. When the magnetic core material configured by dividing the magnetic core of the transformer is assembled, for example, by mounting or adhering to form an EI type magnetic core, the mounting method described in the present embodiment can be widely used.

The structure of the magnetic core described above can be widely used in the case where the magnetic core of a line filter, a choke coil or the like is divided.

[0024]

According to the transformer of the present invention, the magnetic core 10 is composed of a pair of magnetic core members 11, 11 so that the magnetic core 10 constituting the transformer can be easily provided with the coil 40. Magnetic core material 1
Since the structures 1 and 11 are bonded and assembled through the attachment plate 30, both magnetic core materials 11 and 11 can be assembled relatively easily, and the magnetic core materials 11 and 11 can be attached by the attachment plate 30. The assembled state of 11 can be maintained at a high level. Therefore, it is possible to prevent a situation where a loosened assembled state causes a gap at the joint edges of the two magnetic core members 11, 11 as much as possible.

Further, an adhesive is provided between the attachment plate 30 and the side surfaces 11c, 11c of the pair of magnetic core materials 11, 11 which are located on both sides of the joint edge F of the pair of magnetic core materials 11, 11. Since the adhesive 50 can be thinly stretched, the adhesive 50 can be hardened relatively easily. As a result, the adhesive 50 before hardening is soaked between the joint edges F, and the pair of magnetic core materials 11 It is possible to prevent a situation in which the gap t is generated at the joint edge F of the joints 11, 11.

Therefore, the pair of magnetic core materials 11, 11
The variation in the value of the inductance L of the transformer due to the gap t generated at the junction edge F can be reduced as much as possible, and variations in the performance of the transformer can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of a transformer according to an embodiment.

FIG. 2 is a cross-sectional view (upper side view) showing a magnetic core 10 part of a transformer according to an embodiment and an enlarged cross-sectional view (lower side view) of a portion A in the cross-sectional view.

FIG. 3 shows outer legs 11b and 11b of a pair of magnetic core materials 11 and 11.
It is a figure which shows the correlation of the clearance L between the end surfaces 11b 'and 11b' of FIG.

FIG. 4 is a cross-sectional view (upper view) showing a magnetic core 100 of a transformer according to a conventional example and an enlarged cross-sectional view (lower view) of a B portion in the cross-sectional view.

[Explanation of symbols]

 10 magnetic core 11 magnetic core material 20 bobbin 30 attachment plate 40 coil 50 adhesive

Claims (1)

[Claims] 1. A magnetic core of a transformer including a coil, the magnetic core comprising a pair of magnetic core materials formed by combining the magnetic cores, the pair of magnetic core materials excluding a mounting portion of the coil. , A pair of magnetic core members mounted on both sides of a joint edge of the magnetic core members, mounted between side faces of the pair of magnetic core members, and assembled by an attachment plate adhered to the side faces by an adhesive. A transformer characterized by that.