JPS60182119A - Manufacture of wound core - Google Patents

Abstract

PURPOSE:To form a wound core without decreasing magnetic characteristic by winding an amorphous magnetic alloy strip on a bobbin of multiple stages aligned on the same axial line sequentially from those having smaller diameter of a plurality of winding units having different diameters, heat treating them, and then associating coaxially winding layers. CONSTITUTION:A bobbin 2 is used to wind a thin amorphous magnetic alloy strip 1. The bobbin has a plurality of winding units 2a-2d for winding the strips, the inner diameters d1-d4 for winding the strips 1 in the units 2a-2d are different from each other, and those having smaller diameter of the units 2a- 2d are sequentially aligned on the coaxial line in multiple stage. The bobbin 2 is rotated to sequentially feed the strip 2 from a supply reel 3, and wound on the units 2a-2d of the bobbin 2. The wound strips are heat treated to remove distortions, and the strips 1 wound on the units 2a-2d are displaced laterally and coaxially associated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a wound core made of an amorphous magnetic alloy ribbon.

[Technical background of the invention and its problems]

BACKGROUND ART Recently, it has been considered to manufacture wound cores used in transformers and the like using amorphous magnetic alloy materials having excellent magnetic properties. This amorphous magnetic alloy material is made into a thin ribbon manufactured by an ultra-quenching method using an alloy consisting of metals such as iron and cobalt and elements such as boron and carbon. It exhibits excellent excitation characteristics with significantly lower iron loss and excitation current than raw steel sheets.

However, since amorphous magnetic alloy materials (hereinafter referred to as amorphous magnetic alloy ribbons) are manufactured by an ultra-quenching method, thermal stress remains inside the material, so they are generally heat-treated in a magnetic field. Unless the strain is removed by annealing, the good magnetic properties that the material originally possesses cannot be obtained. Therefore, when manufacturing a wound core using an amorphous magnetic alloy ribbon, strain relief annealing is performed after the amorphous magnetic alloy ribbon is wound.

In this case, the range of appropriate heat treatment temperature conditions for the amorphous magnetic alloy ribbon is narrow, and in order to obtain good magnetic properties, it is necessary to set the temperature and holding time within a predetermined range. In other words, even if the heat treatment temperature is too low or too high, the recovery rate of the magnetic properties of the amorphous magnetic alloy ribbon (the rate at which internal strain is removed) is small, and the permissible temperature range is ±5.
℃ or less is considered to be good, and if it exceeds ±10℃, the magnetic properties deteriorate. In addition, as the holding time at the heat treatment temperature becomes longer,
The magnetic properties of the amorphous magnetic alloy ribbon 1 deteriorate. Therefore, in order to heat-treat the amorphous magnetic alloy ribbon for strain relief without impairing the excellent magnetic properties originally possessed by this material, it is necessary to heat the entire ribbon at a uniform temperature (±5°C) in a short time. It is necessary to do so.

Conventionally, when manufacturing a wound core using an amorphous magnetic alloy ribbon, the amorphous magnetic alloy ribbon 1 is placed around a winding form 2 as shown in FIGS. 1 and 2. The wound body 3 is formed by continuously winding it uniformly in the width direction, and the wound body 3 is subjected to a heat treatment to remove distortion.

However, when the winding body 3 having the winding configuration as described above is heat-treated, temperature differences occur between each part of the winding body 30 in the thickness direction and each part in the width direction, and one winding body 3 as a whole, that is, the winding It is difficult to raise and lower (cool) the entire amorphous magnetic alloy ribbon I to a uniform temperature in a short time, and as a result,
There was a problem in that the excellent magnetic properties of the amorphous magnetic alloy ribbon 1 were deteriorated. Figure 3 shows the temperature increase during heat treatment (410
12 is a diagram illustrating an example of the temperature distribution in the winding thickness direction of the wound body 3 at a temperature of 1 hour. According to this diagram, the temperature at the center in the thickness direction of the wound body 3 is particularly low compared to the temperature at the inner and outer circumferences, and a temperature difference of 5 to 25 degrees Celsius is unlikely to occur between the two. I understand. FIG. 4 is a diagram showing an example of the temperature distribution in the width direction of the wound body 30 during the same temperature increase as described above.

According to this diagram, the temperature at the center in the width direction of the wound body 3 is
It can be seen that the temperature is particularly low compared to the temperature at both ends, and a temperature difference of 2 to 5° C. occurs between the two ends. When the wound body 3 is heat-treated in this way, the temperature of the wound body 3 partially varies, resulting in uneven temperature distribution9, and it is not possible to maintain a uniform temperature throughout the wound body 3. . Therefore, if the temperature is maintained until the central part of the wound body 3 reaches a predetermined heat treatment temperature, the amorphous magnetic alloy will be The ribbon 1 reached a high temperature and began to crystallize, causing deterioration of magnetic properties.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and provides a method for manufacturing a wound core that can manufacture a wound core made of an amorphous magnetic alloy ribbon with excellent magnetic properties without deteriorating the magnetic properties. It is something to do.

[Summary of the invention]

The method for manufacturing a wound core of the present invention uses a winding form with a multistage configuration in which a plurality of winding portions having different winding inner diameters are lined up on the same axis in a j-line starting from the smallest diameter, and each winding of this winding form is Tori 9
The amorphous magnetic alloy ribbon is wound around the winding section of the winding die, and then the amorphous magnetic alloy ribbon is subjected to strain relief heat treatment, and then the amorphous magnetic alloy ribbon is wound around each winding section of the winding form. The wound core is formed by concentrically combining the respective winding layers. In other words, by performing strain relief υ heat treatment on an amorphous magnetic alloy ribbon that has been wound around a winding die in multiple layers, the entire wound amorphous magnetic alloy ribbon is removed during the heat treatment. The temperature is raised and lowered uniformly to a predetermined temperature in a short period of time, thereby preventing deterioration of the magnetic properties of the amorphous magnetic alloy ribbon.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in drawings.

First, an amorphous magnetic alloy ribbon 1 is wound using a winding form 2 shown in FIG. The winding form 2 has a plurality of winding sections 2a and 2b, each having a rectangular shape, for winding the amorphous magnetic alloy ribbon 1.
, 2c, 2d, each of these winding portions 2a to 2d.
The amorphous magnetic alloy ribbon 1 is wound in a multi-stage structure in which the winding inner diameters d1, rd2, +da, and d4 of the windings 2d are different from each other, and the windings 28 to 2d are arranged on the same axis in order from the smallest diameter. It is composed of That is, a wound body formed by winding the amorphous magnetic alloy ribbon 1 using the winding form 2 is divided into a plurality of winding layers in the direction of the winding thickness, and each turn of the amorphous magnetic alloy ribbon 1 is divided into a plurality of winding layers in the direction of the winding thickness. The inner diameter of the winding layer is set as the winding inner diameter d~d4 of each of the winding parts 2a~2d, respectively. Therefore, each of the winding sections 28 to 2d winds the amorphous magnetic alloy ribbon 1 according to each of the divided winding layers. In addition, the winding thickness of the amorphous magnetic alloy ribbon 1 wound in each winding part 2a to 2d and each winding part 9 part 2a to 2d
The sum of the thickness and the thickness is set so that the heat capacities of each of the winding sections 2a to 2d are as equal as possible. Further, the width dimension of each winding portion 2a to 2d is set equal to the width of the amorphous magnetic alloy ribbon 1 in this embodiment.

Then, as shown in FIG. 5, the winding form 2 is rotated by a device (not shown), and the amorphous magnetic alloy ribbon 1 is sequentially fed from the supply reel 3 to each winding section 28 of the winding form 2.
At ~2d, the amorphous magnetic alloy ribbon 1 is wound up. In this case, each of the winding sections 2a to 2d winds up the amorphous magnetic alloy ribbon 1 at a predetermined thickness in order of diameter starting from the smallest diameter. Therefore, the amorphous magnetic alloy ribbon 1 is divided and wound into winding layers of a predetermined thickness by each of the winding sections 2a to 2d, and these winding layers are staggered in the width direction of the ribbon. It is rolled up in the same position. The widthwise shift amount of this wound layer corresponds to the width dimension of the amorphous magnetic alloy ribbon 1. FIG. 6 shows a state in which the amorphous magnetic alloy ribbon 1 is wound around the winding form 2. As shown in FIG.

Next, the amorphous magnetic alloy ribbon 1 wound around the winding form 2 as described above is subjected to strain relief p heat treatment to remove the strain occurring in the amorphous magnetic alloy ribbon 1. This heat treatment is performed by heating the amorphous magnetic alloy ribbon 1 to a predetermined temperature in a processing furnace filled with an inert gas, and then cooling it to lower the temperature. Here, the amorphous magnetic alloy ribbon 1 is heated and cooled while being divided by the winding die 2 into a plurality of winding layers in multiple stages in the direction of the winding thickness of the winding core.

Therefore, each winding layer of the amorphous magnetic alloy ribbon 1 is heated and cooled by forced convection and heat conduction in the processing furnace.
The temperature is raised and lowered to a predetermined temperature in a short time in a uniform state. In addition, each winding layer conducts heat well,
The temperature difference in the width direction of the amorphous magnetic alloy ribbon 1 becomes smaller.

Therefore, the temperature distribution in each part of the amorphous magnetic alloy ribbon 1 wound around the winding form 2 is made uniform, and the entire amorphous magnetic alloy ribbon 1 is heated to a uniform predetermined temperature in a short time. and the temperature will decrease.

FIG. 9 is a diagram showing the temperature distribution in the winding thickness direction of the wound body of the amorphous magnetic alloy ribbon 1 during heat treatment (410° C. during heating, held for 1 hour). As is clear from this diagram, the difference between the temperature at the center in the direction of the winding thickness of the wound amorphous magnetic alloy thin body 1 and the temperature at the inner and outer circumferences is 6°C, as described above. We were able to keep the temperature within the permissible temperature range of ±5°C without degrading the magnetic properties. This made it possible to improve the core loss of the amorphous magnetic alloy ribbon 1 by about 10% compared to the conventional method.

After heat-treating the amorphous magnetic alloy ribbon 1 in this manner without degrading its magnetic properties, the amorphous magnetic alloy ribbon 1 wound around each winding section 2a to 2d of the winding form 2 is heated. By shifting them in the width direction and concentrically combining them, a wound core 4 shown in FIG. 8 is formed.

In the above-described embodiment, when the amorphous magnetic alloy ribbon 1 is wound around the winding form 2, the magnetic properties are improved between the winding layers of the amorphous magnetic alloy ribbon 1. It can be rolled up with a silicon steel plate interposed therebetween. That is, a silicon steel plate is wound in advance on each of the winding portions 2a to 2d of the winding form 2, and the amorphous magnetic alloy ribbon 1 is wound on each of the silicon steel plates. 2d amorphous magnetic alloy thin plate 1
By overlapping the silicon steel plates with the silicon steel plates shifted in the width direction, the silicon steel plates can be easily interposed between the 10 turns of the amorphous magnetic alloy thin plates. In this way, even if there is no insulation coating on the surface of the amorphous magnetic alloy ribbon 1, the layers of the amorphous magnetic alloy ribbon 1 are insulated by the silicon steel plate having the insulation coating. Therefore, the generation of eddy current can be reduced, and it is very effective in improving the magnetic properties of the wound core.

Further, in the winding process of the present invention, the amount by which the amorphous magnetic alloy ribbon 1 is shifted in the width direction is not limited to the same size as the ribbon width as in the above embodiment. When winding the amorphous magnetic alloy ribbon 1 in order from the winding section 2a on the small diameter side of the winding form 2, the width dimensions of each winding section 2a to 2d should be different as shown in FIG. By using the vertical winding form 2, the dimension in the width direction can be changed when winding the amorphous magnetic alloy ribbon 1. Winding form 2 shown in Figure 10
The width of the winding section 2a is set to be the same as the width of the amorphous magnetic alloy ribbon 1, and the width of the winding section 2b to 2d is set smaller than the width of the ribbon 1. There is. Therefore, when this winding form 2 is used, a part of each winding layer of the amorphous magnetic alloy ribbon 1 is polymerized in the width direction. In this way, when forming the wound core after heat treatment, each wound layer can be easily shifted in the width direction, and the formation of the wound core becomes easy.

Note that the present invention is not limited to rectangular cores, but can also be applied to circular cores.

〔Effect of the invention〕

As explained above, according to the method for manufacturing the wound core of the present invention, heat treatment is performed without impairing the magnetic properties of the amorphous magnetic alloy, and the wound core can exhibit the excellent magnetic properties of the amorphous magnetic alloy ribbon. You can get iron core.

[Brief explanation of drawings]

Fig. 1 is a front view showing a wound body formed by a conventional manufacturing method, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Figs. Diagrams showing the temperature distribution during heat treatment in the body, FIGS. 5 to 9 show an example of the manufacturing method of the present invention, FIG. 5 is an explanatory diagram showing the winding process, and FIG. 6 Figure 7 is an enlarged sectional view showing the winding form, Figure 8 is a perspective view showing the winding core, and Figure 9 is the winding form. Figure 10 is a diagram showing the temperature distribution when the amorphous magnetic alloy ribbon wound in the winding form is heat treated, and Figure 10 is a cross section showing the state in which the amorphous magnetic alloy ribbon is wound with a winding form in another example. It is a diagram. 1... Amorphous magnetic alloy ribbon, 2... Winding form, 2a-2
d... Winding part, 4... Winding core. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A winding form with a multi-stage configuration is used, in which multiple winding sections with different inner winding diameters are arranged on the same axis in order from the smallest diameter to the smallest.
An amorphous magnetic alloy ribbon is wound around each winding part of the winding form, and then, in this wound state, the amorphous magnetic alloy ribbon is subjected to strain relief υ heat treatment, and then the winding form is heated. A method for manufacturing a wound core, characterized in that the wound core is formed by concentrically combining the wound layers of the amorphous magnetic alloy ribbon wound on each of the nine winding portions.