JPH0199204A - Magnetic core - Google Patents

Abstract

PURPOSE:To uniformize the distribution of a magnetic flux and to improve electromagnetic properties by combining magnetic core member having a semicircular section formed by gathering linear members, and forming a winding coil unit having a circular section. CONSTITUTION:A magnetic core 1 has a semicircular section and two amorphous wire material core members 2A, 2B each including an overall elliptical shape. The linear parts of both the members 2A, 2B are bonded, and the parts becoming circular sections are employed as winding coil units 3. The members 2A, 2B are formed of noncrystal wire material having quenched composition of soft magnetic material containing as main ingredients Fe, Si, B, Co, etc. Thus, the distribution of the magnetic flux is uniformized, and preferably electromagnetic properties are provided.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a high-frequency transformer used for high-frequency high-voltage transformation, and a pulse voltage generator such as a mag-amp used for high-frequency pulse generation. The present invention relates to a magnetic core for forming a magnetic path in a choke or the like.

(Prior Art) Conventionally, magnetic cores of transformers and the like have mainly been made of silicon steel plates. Also, recently, Fe.

Si, 3. A magnetic core is also constructed by laminating amorphous tapes (ribbons), which are rapidly solidified alloys made of Co or the like.

Magnetic cores using amorphous tape have high magnetic permeability, low current loss, and non-directional magnetization characteristics, so they have good high frequency characteristics and low heat generation, that is, low power loss and low It also exhibits excellent electrical characteristics such as noise signal amplification.

In recent years, it has become easier to form linear magnetic core materials using amorphous materials.

However, in the case of a magnetic core made of laminated tape-shaped amorphous soft magnetic material, the cross section of this magnetic core is inevitably square, whereas the winding state of the coil wound around this magnetic core is essentially circular. Therefore, when a transformer or a choke coil is formed using such a magnetic core and coil, there is a problem in that a magnetic flux gap is likely to occur between the magnetic core and the coil.

In addition, as long as the cross section of the magnetic core is square, no matter how close to a circle the coil is wound, the magnetic flux distribution in the magnetic core will not be uniform in the center and periphery, and due to this non-uniform magnetic flux distribution. There is a problem that high frequency characteristics are inhibited.

On the other hand, in the case of small-sized, low-power magnetic cores, it is also possible to make the amorphous tape tapered at the beginning and end of the winding so that the cross section of the completed magnetic core has a circular shape. Small transformers and small choke coils using shaped magnetic cores have also been put into practical use.

However, when the above-described configuration is applied to a large-sized, high-power magnetic core, a large amount of the amorphous tape is discarded, which poses an economical problem.

It is also possible to form a magnetic core with a circular cross section by sintering amorphous magnetic powder, but in this case,
It is not suitable for practical use due to its magnetic and electrical characteristics, such as a marked decrease in magnetic permeability and large amounts of magnetic flux loss and heat generation.

Also, referring to silicon steel sheets, silicon steel is a soft magnetic material with excellent magnetic properties, but the more Si it contains, the worse its mechanical properties are, and its malleability is poor and it has almost no ductility, so it is easily broken. Therefore, such silicon steel has a thickness of 50 μm.
It is best to have a plate-like core, and it is impossible to make it into a wire, so it was inevitably impossible to manufacture a wire-like silicon steel magnetic core.

(Problems to be Solved by the Invention) As mentioned above, magnetic cores using amorphous tape are insufficient in terms of electromagnetic properties and economical efficiency, and magnetic cores made of silicon steel are mechanically unstable. There is a problem in that it is not possible to obtain satisfactory physical characteristics.

Therefore, an object of the present invention is to provide a magnetic core that is excellent in both electromagnetic properties and mechanical properties.

[Structure of the Invention] (Means for Solving the Problems) The magnetic core of the present invention has a winding portion having a circular cross section by combining magnetic core members each having a semicircular cross section formed by collecting linear members. was formed.

(Function) In the magnetic core having the above configuration, the cross-sectional shape of the winding portion is circular due to the combination of magnetic core members having a semicircular cross section formed by collecting wire members. By winding the winding around the winding portion and energizing it, the distribution of magnetic flux induced becomes uniform, resulting in good electromagnetic characteristics.

Furthermore, since the wire winding portion is a collection of linear members, the mechanical properties are also good.

(Example) The present invention will be described in detail below. The magnetic core 1 shown in FIGS. 1 and 2 has two magnetic core members 2A and 2B made of amorphous wire, each having a semicircular cross section and an elliptical overall shape. Then, the straight portions of both magnetic core members 2A and 2B are joined, and the portion having a circular cross section is used as the winding portion 3.

An example of manufacturing such a magnetic core 1 will be described with reference to FIGS. 3 to 6.

First, a winding frame 4 having a semicircular winding region 5 formed along its outer periphery as shown in FIGS. 3(a) and 3(b) is prepared. This winding frame 4 is an upper frame 4 having a vertically symmetrical shape in FIG. 3(a).
It is constructed by butting A and the lower frame 4B.

Next, as shown in FIG. 4(a), in the winding area 5 of the winding frame 4,
A wire rod 6 made of an amorphous soft magnetic material with a wire diameter of 10 to 200 μm is wound, and a semicircular winding area 5 is formed as shown in FIG. 4(b).
Wrap the entire area with the wire rod 6.

Due to recent technological advances, this wire rod 6 can be manufactured by quenching an amorphous soft magnetic material, and is known to have high strength and high tensile strength.

Next, in the state shown in FIG. 4(b), the wire rod 6 in the winding area 5 was impregnated with epoxy resin, polyester resin, polyether ether ketone (PEEK) resin, etc., and the wire rod 6 in the wound state was fixed. After that, the two upper frames 4A and the lower frame 4
If B is removed in a divided state, a magnetic core member 2A shown in FIGS. 5 and 6 can be obtained.

Then, if this magnetic core member 2A and another magnetic core member 2B manufactured in exactly the same manner in the above-mentioned manufacturing process are butted together so that their linear portions are joined, the results shown in FIGS.
As shown in the figure, a magnetic core 1 having a wire winding portion 3 having a circular cross section can be obtained.

By applying coil windings 7A and 7B to the winding portion 3 of this magnetic core 1 as shown in FIG. 7, it can be used as a high frequency transformer T.

According to this transformer T, for example, one coil winding 7
When a high frequency current is passed through A, the magnetic flux distribution of the line-marked winding portion 3 having a circular cross section becomes uniform, thereby providing good high frequency characteristics.

In addition, the magnetic core 1 itself has a wire rod 6 with high strength and high tensile strength.
Since it is used, its mechanical properties are also good.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.

For example, instead of the magnetic core 1 described above, it is also possible to use a magnetic core in which the magnetic core is divided into two vertically symmetrical shapes to facilitate insertion of coil windings.

[Effects of the Invention] According to the present invention described in detail above, a magnetic core with excellent electromagnetic and mechanical properties can be provided.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line I-I of the same, Fig. 3 (a) is a plan view of the winding frame, and Fig. 3 (b) is a plan view of the same -■ Line sectional view, Figure 4 (a> is a plan view showing the state in which the wire rod is wound around the winding frame, Figure 4 (b) is a cross-sectional view showing the state in which the wire rod is wound around the winding frame, Figure 5 is a plan view of the magnetic core member, Figure 6 is a cross-sectional view taken along the line ■-■ in Figure 5, and Figure 7 is a plan view of the magnetic core member.
The figure is a plan view showing a state in which a transformer is constructed using the magnetic core of this embodiment. DESCRIPTION OF SYMBOLS 1... Magnetic core, 2A, 2B... Magnetic core member, 3... Winding winding part. Agent Patent Attorney Nori Chika Ken Shu
Takeshi Kondo CG) Figure 3

Claims (2)

[Claims] (1) A magnetic core characterized by having a wire winding portion having a circular cross section formed by combining magnetic core members in which linear members are assembled so as to have a semicircular cross section. (2) The magnetic core according to claim 1, wherein the magnetic core member is formed of an amorphous wire material which is a quenched structure of a soft magnetic material mainly composed of Fe, Si, B, Co, etc.