JPH06260347A - Magnetic material core - Google Patents

Abstract

PURPOSE:To provide a magnetic material core of split type of less leakage magnetic flux, with its manufacture being very easy. CONSTITUTION:Relating to a magnetic material wherein magnetic path is formed by coupling split magnetic material cores, a butt part of magnetic material core's split bodies 11 is formed with mount surfaces consisting of a butt surface 11 and a non-butt surface 13, and the non-butt surface 13 is non- contacting surface. By establishing contact with the non-butt surface 13, leakage magnetic flux is reduced than before, magnetism reluctance increase is reduced and drop of effective magnetic permeability is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a transformer, N.
The present invention relates to a magnetic core used when MR-CT or other cores need to be divided.

[0002]

2. Description of the Related Art From the viewpoint of performance of a transformer or the like, a magnetic core is formed into a ring shape without being divided, and a special machine such as a toroidal winding machine is used to wind a coil as thinly as possible. Is good. General CT (Current T)
(transformer) is still manufactured by this method. However, with this method, the winding speed of the coil is slow,
Especially when the wire diameter becomes thick, it is difficult to mass-produce industrially.
Therefore, in a transformer or the like, it is generally used that the magnetic cores are not divided into rings, but the magnetic cores are separately wound and then the magnetic cores are abutted or bonded together.

FIG. 6, FIG. 7 and FIG. 8 show a general shape of a split type magnetic core used in a conventional transformer. 6A is what is called an EI core, FIG. 6B is what is called an EE core,
(C) is what is called a UU core. 7 and 8 show another type of magnetic core, which is shown in FIG.
There is a core and what is commonly called a mountain core in FIG.
There are various shapes other than the above.

In the laminated type magnetic core shown in FIG.
As shown in (A) above, two magnetic core divided bodies 1 and 1 made of E-shaped thin plates are opposed to each other in opposite directions, and are vertically displaced by the thickness, and a part thereof is removed as shown in (B) of the same figure. The magnetic paths are formed by sliding them so as to overlap with each other, stacking them in a plurality of layers in the thickness direction as shown in FIG. 7C, and bringing them into contact with each other through an adhesive layer (not shown). In the magnetic core of FIG. 8,
As shown in (A) of the figure, a pair of mountain-shaped magnetic core divided bodies 2 and 2 face each other at the same level, and end faces thereof abut each other to form a magnetic path.

[0005]

However, if the magnetic core divided bodies having the shape shown in FIG. 6 are butted and formed into a ring-shaped magnetic core by means such as bonding, the split cores from the butted or bonded parts are used. The leakage magnetic flux is large, the magnetic resistance increases, the effective magnetic permeability of the core decreases, and the performance of the transformer and the like decreases. In order to reduce the leakage magnetic flux at the butt section, it is necessary to give a precise surface finish to the end surface without adhering the butt section and fix it by tightening with a jig, which complicates the manufacturing process. there were.

On the other hand, in the case of the laminated type magnetic core shown in FIG. 7, it is not necessary to precisely process the end face of each magnetic core divided body.
However, since the magnetic core divided bodies are in surface contact with each other in an insulating state, there is a problem that the eddy current loss is reduced but the leakage magnetic flux is increased and the performance of the transformer or the like is deteriorated. Further, in the case of the magnetic core of FIG. 8, there is an effect that the leakage magnetic flux is reduced by increasing the surface area of the abutting portion 3 of each magnetic core divided body 2, but the leakage magnetic flux from the abutting portion 3 is as much as possible. In order to reduce the number, it is necessary to finish the abutting end surface of each magnetic core divided body 2 with high accuracy, which also causes a problem that the manufacturing process becomes complicated.

Particularly, in the case of a large magnetic core, it is inevitable that the core is divided, and the joining thereof becomes a problem. At present, there is no suitable method, and there are many examples in which the end surface of the magnetic core divided body is finished with high precision as described above and bonded, but not only the leakage flux due to the gap of the bonded surface but also the weight is heavy. The problem is that the adhesive strength must be sufficiently high.

As described above, in the conventional split type magnetic core, the leakage magnetic flux is increased, the magnetic resistance is increased, and the effective magnetic permeability of the core is lowered. In order to reduce the leakage magnetic flux, it is necessary to precisely process the abutting end faces of each magnetic core divided body, and in some cases, the manufacturing process becomes complicated, such as fixing with a special jig. In the case of a large-sized magnetic core, it is usual that the abutting portions of the magnetic core divided bodies are bonded and integrated, but it is necessary to secure the end face finishing processing and the bonding strength of the bonding surface. There was an unsolved problem such as.

The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a magnetic core which has a small leakage magnetic flux and is extremely easy to manufacture even if it is a split type. Has an aim.

[0011]

SUMMARY OF THE INVENTION The inventors of the present invention utilize the advantages of the butt and stacking methods of the prior art, solve the above-mentioned problems, and further facilitate assembly and joining. As a result of earnest efforts, the present invention has been achieved.
That is, according to the present invention, in a magnetic core in which magnetic core divided bodies are assembled to form a magnetic path, the abutting portions of the magnetic core divided bodies are formed by a plurality of surfaces, and The butt surface is a contact surface.

Hereinafter, the details of the present invention will be described with reference to the drawings. First, the case of a sintered body or a bonded body core will be described. 1A and 1B show abutting portions 22 of a pair of magnetic core divided bodies 11. FIG. 1A is a sectional view and FIG. 1B is a plan view.

In the magnetic core of the present invention, unlike the conventional one, the abutting portion 22 of the magnetic core divided body 11 is formed by a plurality of surfaces including the abutting surface 12 and the non-abutting surface 13, and the non-abutting surface 13 is formed. It is considered to be the contact surface.
In the case of FIG. 1, the end portions of the magnetic core divided body 11 are stepped in the thickness direction to form the two abutting faces 12a and 12b with a shift, and the abutting faces 12a and 12b are also formed.
The non-butting surface 13 parallel to the core plane 11a is located between b.
Is provided.

When assembling the pair of magnetic core divided bodies 11, the abutting surface 12 of one magnetic core divided body 11 is assembled.
The a and 12b are made to face the abutting surfaces 12b and 12a of the other magnetic core divided body 11, respectively, and both non-abutting surfaces 13 are made to contact. Each abutting surface 12a and 1
The voids 14 and 15 may be present together with either or both of them. Even if the gaps 14 and 15 are present in the abutting portion 22 of the assembled magnetic core, a detour magnetic path is easily formed by the non-abutting surface 13 in contact with each other, and the detour magnetic path is slightly formed from the surface layer of the magnetic core. The magnetic flux only leaks to the outside. Therefore, the non-butting surface 1
3 has a long and wide surface as much as possible, and the effect of preventing magnetic flux leakage is increased by increasing the contact area.

The cross-sectional shape of the butted portion 22 of FIG. 1 may be variously modified as shown in FIG. In FIG. 2A, the non-butting surface 13 is an inclined surface, which is easier to assemble than that in FIG. In FIG. 2B, the non-butting surface 13 is an inclined surface, and the height of each of the abutting surfaces 12a and 12b is made higher to increase the facing area. The magnetic flux leakage from the abutting portion 22 is as described above. It is less than that of FIGS. 1 and 2A. Further, the non-butting surface 13 which is the contact surface may be two or more surfaces as shown in FIG.

In any case, in the case of the present invention, it is not necessary to perform end face machining with high precision on the magnetic core divided body as in the conventional case. FIG. 3 shows a case where the present invention is applied to a laminated magnetic core made of thin plates. 3A, the abutting portion 22 of the magnetic core divided body 11 made of a thin plate has an abutting surface 12 at the end surface and a non-butting surface 13 at the thin plate surface.
And the non-butting surface 13 is the contact surface. The magnetic core divided bodies 11 are abutted one by one on the abutting surface 12, and then the abutting portions 22 are alternately shifted to be laminated in a multi-layer in the thickness direction, and the non-abutting surfaces 13 are brought into contact with each other to be laminated.

The abutting portions 22 may not be alternately staggered in each layer in this way, but may be stacked in a plurality of layers as shown in FIG. 3B. FIG. 3C is a plan view. In principle, the lamination of thin plates increases the effect of preventing magnetic flux leakage. Further, although the abutting portions 22 are aligned in the thickness direction in the figure, the positions of the layers may not necessarily be aligned as shown in the figure but may be different. The present invention can also be applied to a ring-shaped core. FIG. 4A is a two-divided type of a sintered body and a bonded body, and FIG. 4B is a thin plate laminated type. In (B) of the figure, two layers are used for the sake of simplicity.
There may be any number of layers, and the butted portions do not have to be at the same position.

The magnet used in the present invention is not particularly limited, and examples thereof include ferrite magnets and rare earth magnets. As the rare earth magnet, a magnet containing Sm, Co as a main component, a magnet containing Nd, Fe, B as a main component, or Sm, F
There are magnets mainly composed of e and N.

[0019]

EXAMPLES Examples of the present invention will be shown below. Example 1 Ferrite cores having a shape as shown in FIG. 5A were combined and the strength of the magnetic field was measured at a location 2.5 mm away from the D surface. On the other hand, as a comparative example, a ferrite core was combined as shown in FIG. 5B, and the magnetic field strength at a location 2.5 mm away from the D surface was measured and compared with the magnetic field strength of the example. As a result, when the magnetic field strength of the comparative example was 1.0, the magnetic field strength of the example was 1.5.

Example 2 A magnetic field of Comparative Example 1 was measured by combining the magnetic cores of FIG. 5A formed mainly of SmCo and measuring the magnetic field strength 2.5 mm away from the D surface. The magnetic field strength was 1.7 times that of the comparative example.

Example 3 A magnetic core having Nd, Fe and B as main components and having a magnetic core as shown in FIG. 5A was combined, and the strength of the magnetic field at a location 2.5 mm away from the D surface was measured. When compared with the magnetic field strength of No. 1, the magnetic field strength was 1.5 times that of the comparative example.

Example 4 A bonded magnetic core containing Sm, Fe and N as main components and having a shape as shown in FIG.
The strength of the magnetic field at a distance of m was measured and compared with the strength of the magnetic field of the comparative example, the magnetic field strength was 1.6 times that of the comparative example.

[0023]

According to the present invention, the abutting portions of the magnetic core divided bodies are formed by a plurality of surfaces, and the non-abutting surface of the plurality of surfaces is used as the contact surface. Even if there is, the magnetic flux leakage can be reduced, and the magnetic core having a small magnetic flux leakage can be industrially very easily produced by the split type.

Further, by having a contact surface at the non-butting portion and adhering this contact surface, not only magnetic flux leakage is small, but also the cores can be easily joined and strengthened. Furthermore, since there is little problem even if there is a slight gap at the abutting portion, when importance is attached to the adhesive strength, it is possible to obtain an effect that the abutting portion can adhere and the leakage magnetic flux is small.

[0025]

[Brief description of drawings]

FIG. 1 shows a butted portion of a magnetic core made of a sintered body or a bonded body according to the present invention, (A) is a sectional view,
(B) is a plan view.

2A, 2B, and 2C are cross-sectional views showing an example of modification of FIG. 1 by a sintered body or a bonded body.

3A and 3B show a case of the thin plate laminating system of the present invention, in which FIG. 3A is a cross-sectional view of the layers laminated by butting each other, FIG. 3B is a cross-sectional view of another laminating system, and FIG. .

FIG. 4A is a perspective view of a sintered body or a bonded body, and FIG. 4B is a perspective view of a laminated body in the case of a ring core division method.

FIG. 5A is a side view of the magnetic core of the embodiment, and FIG.
FIG. 4 is a side view of a magnetic core of Comparative Example.

6 (A), (B) and (C) are plan views of a conventional split type magnetic core.

7A is a plan view of a conventional E-type laminated magnetic core before lamination, FIG. 7B is a plan view of an E-type laminated magnetic core after lamination, and FIG. 7C is a side view after lamination. is there.

FIG. 8A is a plan view of a conventional mountain-shaped laminated magnetic core,
(B) is a side view thereof.

[Explanation of symbols]

 11 magnetic core divided body 12 butt surface 13 non-butt surface 22 butt portion

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[Procedure amendment]

[Submission date] October 25, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure amendment]

[Submission date] December 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

In the laminated type magnetic core shown in FIG.
As shown in (A) above, two magnetic core divided bodies 1 and 1 made of E-shaped thin plates are opposed to each other in opposite directions, and are vertically displaced by the thickness, and a part thereof is removed as shown in (B) of the same figure. Slide them so that they overlap, leaving (C) in the figure ( plan view of (B))
As described above, the magnetic paths are formed by stacking the layers in a plurality of layers in the thickness direction and bringing them into contact with each other through an adhesive layer (not shown). Figure 8
In the magnetic core of No. 2, as shown in (A) of the same figure, a pair of mountain-shaped magnetic core divided bodies 2 and 2 are made to face each other at the same level and end faces are abutted to form a magnetic path. is doing. ((B) is a plan view of (A) and 3 is abutting.
Kake part)

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

In the magnetic core of the present invention, unlike the conventional one, the abutting portion of the magnetic core divided body 11 is formed by a plurality of surfaces including the abutting surface 12 and the non-abutting surface 13, and the non-abutting surface 13 is in contact. It is regarded as a face. Figure 1
In the case of, the end portions of the magnetic core divided body 11 are stepped in the thickness direction and the two abutting surfaces 12a and 12b are displaced from each other, and a core plane is formed between the abutting surfaces 12a and 12b. A non-butting surface 13 parallel to 11a is provided.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

The cross-sectional shape of the butted portion in FIG. 1 may be variously modified as shown in FIG. In FIG. 2A, the non-butting surface 13 is an inclined surface, which is easier to assemble than that in FIG. In FIG. 2B, the non-butting surface 13 is an inclined surface, and the height of each of the abutting surfaces 12a and 12b is made higher to increase the facing area. The magnetic flux leakage from the abutting portion 22 is as described above. It is less than that of FIGS. 1 and 2A. Further, the non-butting surface 13 which is the contact surface may be two or more surfaces as shown in FIG.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

The combination of the magnetic core of FIG. 5 (A) formed in Example 2 Sm, Co as a main component, and measuring the intensity of the magnetic field at a distance 2.5mm from surface D, Example 1 Similar shape to the comparative example
When compared with the magnetic field strength of the magnet containing Sm and Co as the main components, the magnetic field strength was 1.7 times that of the comparative example.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

The combination of the magnetic core of Example 3 Nd, Fe, B of FIG. 5 as a main component (A), measuring the strength of the magnetic field at a distance 2.5mm from surface D, Example N of the same shape as the comparative example of No. 1
When compared with the magnetic field strength of the magnet containing d, Fe, and B as the main components, the magnetic field strength was 1.5 times that of the comparative example.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Example 4 A bonded magnetic core containing Sm, Fe and N as main components and having a shape as shown in FIG.
The strength of the magnetic field was measured at a distance of m , and comparison with Example 1 was made.
Of a magnet mainly composed of Sm, Fe and N having the same shape as the example
When compared with the magnetic field strength, the magnetic field strength was 1.6 times that of the comparative example.

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (1)

[Claims] 1. In a magnetic core for assembling a magnetic core divided body to form a magnetic path, abutting portions of the magnetic core divided bodies are formed by a plurality of surfaces, and a non-contacting portion of the plurality of surfaces is formed. A magnetic core characterized in that the abutting surfaces are contact surfaces.