JP2797772B2 - Wound iron core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer wound core having excellent manufacturability.

[0002]

2. Description of the Related Art In recent years, various types of transformer cores have been used. Among them, a one-turn cut wound core is widely adopted for medium-capacity distribution transformers in view of performance and manufacturability.

A conventional wound iron core of this type will be described with reference to FIGS. 3 and 4. FIG. As shown in the figure, the magnetic band 41 is made of silicon steel and has a thickness of 0.2 to 0.3 mm and is made of one sheet. Single magnetic bands 41a, 41b, 41
c, 41d are formed.

[0004] A specific example of a thin material is an amorphous magnetic alloy prepared by a rapid quenching method and has a thickness of about 25 microns. The work of assembling the iron core is performed in order from the single magnetic strip 41a, or
a, 41b, 41c, and 41d are divided into blocks to perform the processing in block units. Also, reference numeral 42 denotes a gap portion of the overlapping portion,
L shown in FIG. 5 is the overlap width. When the overlap width L is smaller than the specified value, the characteristics are deteriorated, so that sufficient consideration is required during the operation.

[0005]

In such a conventional wound iron core, the magnetic strip 41 is composed of a single magnetic strip 41a, 41b, 41.
Since c and 41d are formed by abutting each other with a constant overlap width L, there is a problem that it takes a long time to manufacture and the productivity of the transformer manufacturing is very low. An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a wound iron core capable of greatly improving workability of iron core assembly.

[0006]

According to the present invention, in order to achieve the above object, an auxiliary magnetic body is provided at a joining portion of a magnetic band of a winding core, and a magnetic material is filled in a gap between the joining portions. Fill the adhesive containing, the adhesive will move the magnetic core forward
It is solidified in a magnetized state .

[0007]

According to the present invention, at least one portion of the magnetic core wound in a ring shape is assembled as an iron core without being cut and rearranged, so that the assembling work can be completed in a short time, and further assists in lowering the characteristics in that case. There complement of a magnetic material and a magnetic material containing the adhesive, when solidifying the adhesive, the core sequence
Since it is magnetized in the direction, there is no characteristic deterioration at the abutting portion, and excellent characteristics as a magnetic core can be maintained.

[0008]

EXAMPLES (Example 1) Hereinafter, a description will be given of a first embodiment of the present invention while referring to Figure 1. As shown in the figure, the magnetic strip 1 uses a silicon steel plate or the like for a thick plate, and uses an amorphous magnetic alloy prepared by a rapid quenching method for a thin plate.
Its thickness is on the order of 25 microns. And
The gap of the adhesive 2 at the butt portion can be made to be 0.2 mm or less when the cutting or butt work is performed accurately, but becomes larger when the above-mentioned work is incorrect. The auxiliary magnetic materials 7 and 8 provided to prevent the characteristics from being degraded by the voids are made of the same material as the magnetic band 1 or a different material. Placed inside, outside and between the cores as shown.

Further , the adhesives 2 and 3 are made of iron powder particles or aluminum powder.
Contact of synthetic resin system mixed with magnetic material such as Rufus alloy powder
The higher the mixing ratio of the magnetic substance in the adhesive, the better the magnetic properties
However, the limit is about 95% due to workability. Also, contact
Epoxy resin, polyester resin, etc. as adhesive resin
Resin, PET resin, PBT resin, Polypropylene
Thermoplastic resins such as pyrene resin can be applied.

When the adhesive is solidified, its magnetic properties are improved by magnetizing the magnetic core in the forward direction.

Here, the auxiliary magnetic materials 7, 8 and 4 and the magnetic
The width of the wrap at the contact portion of the band 1 was
5 times or more the cross-sectional area of In addition,
The total cross-sectional area of the auxiliary magnetic materials 7, 8 and 4 is 1% of the cross-sectional area of the magnetic core.
Excellent magnetic properties can be obtained in the range of / 2 to 1/5
You.

Further, the magnetic characteristics of the magnetic belt 1 used for the wound iron core
The arrangement of the auxiliary magnetic materials 7, 8 and 4 depends on the magnetic permeability.
The effect is different, for example, iron with a maximum permeability of 600,000
Steel plate with a maximum magnetic permeability of 70,000 based amorphous alloy
Greater effect.

[0013] The position to dispose the auxiliary magnetic member 7 and 8 in addition to the magnetic core end face is a be the same effect of the position of the is obtained. The auxiliary magnetic members 7 and 8 also have the effect of mechanically reinforcing the butted portion of the magnetic core.

As apparent from the above invention, according to the present invention, an auxiliary magnetic body is provided at the butting portion of the magnetic band of the wound iron core, and the gap between the butting portions is filled with an adhesive containing a magnetic material. Since the adhesive solidifies in a state where the magnetic core is magnetized in the forward direction , the magnetic particles are arranged along the lines of magnetic force, so that the magnetic resistance is reduced. Is significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a wound core according to a first embodiment of the present invention.

FIG. 2 is a schematic front view of a conventional wound iron core.

FIG. 3 is an explanatory view illustrating an overlap width of a superposed portion of a conventional single magnetic body.

[Explanation of symbols]

 1 Magnetic band 2,3 Adhesive 3,7,8 Auxiliary magnetic material

Claims (1)

(57) [Claims] 1. A disposed an auxiliary magnetic material abutting portions of the magnetic strip, the wound core filled with adhesive containing a magnetic material in the gap portion of the butt portion, magnetic said adhesive core in the forward direction
A wound iron core that has been solidified in a solidified state .