JPS60182116A - Manufacture of wound core - Google Patents

Abstract

PURPOSE:To improve the rigidity of a wound core and to improve the magnetic characteristic by inserting and winding a reinforcing plate having good thermal conductivity equal to the entire width of the core at every prescribed winding number position when aligning and winding a plurality of thin amorphous magnetic alloy strips in the lateral direction of the core. CONSTITUTION:Two long and thin amorphous alloy strips 1A, 1B are aligned in the lateral direction of a core, and simultaneously wound to the prescribed winding positions. Then, the strips 1A, 1B are simultaneously wound while inserting a reinforcing plate 2 to between the outer periphery of the winding units of the strips 1A, 1B and the strips 1A, 1B to be subsequently wound. The plate 2 is made of a metal such as aluminum or copper having good thermal conductivity, and formed as a strip having the lateral size substantially equal to the entire width of the core and the lengthwise size matched to the winding length of the strips 1A, 1B of the inserted portion of the core. The winding operation is repeated, the plate 2 is inserted at every prescribed winding number position for one winding, and the strips 1A, 1B are wound to the prescribed outer diameter while winding.

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 used in electromagnetic induction equipment such as a transformer.

[Technical background of the invention and its problems]

In recent years, in response to the demand for the development of energy-saving electrical equipment, the development of amorphous magnetic materials with low iron loss and excellent magnetic properties has progressed, and these materials have become the material for iron cores in electrical equipment, replacing the conventional silicon steel strip. It has come to be put into practical use as a The use of amorphous magnetic alloy ribbons in wound cores, especially large-sized wound cores, is also being considered.

However, this amorphous magnetic alloy ribbon cannot be produced by ultra-quenching.
It is a thin strip produced in a strip shape with a thickness of about 30 to 100 μm using a high-speed winding method, and currently it can only be produced with a small width of about 200 mm. Therefore, when manufacturing a large-sized wound core using amorphous magnetic alloy ribbon, two or more strips of amorphous magnetic alloy ribbon are applied in the width direction of the core because the width of the large-sized wound core is large. They are made by arranging them, combining them, and winding them. However, since the thickness of amorphous magnetic alloy ribbon is much thinner than that of silicon steel strip, it is not possible to simply wind the ribbon in the same way as when using conventional silicon steel strip. When manufacturing a wound core, there are problems such as the rigidity of the wound core is low, the wound core is deformed when the core is assembled, and the magnetic properties of the amorphous magnetic alloy ribbon are deteriorated due to the addition of stress.

In addition, the amorphous magnetic alloy ribbon has extremely poor magnetic properties as it is due to distortion generated during rapid cooling in the manufacturing process, and iron loss increases. Therefore, when manufacturing a wound core using an amorphous magnetic alloy ribbon, the wound core is strained in a magnetic field in a non-oxidizing atmosphere at a temperature of about 400°C for 30 to 2 hours. Heat treatment (annealing) is applied to the part to be removed.
We are working to improve the core loss and magnetization properties of amorphous magnetic alloy ribbons.

However, when an amorphous magnetic alloy ribbon is annealed in a magnetic field, the range of appropriate annealing conditions is very narrow, and in order to obtain good magnetic properties, the entire wound core must be heated to a uniform predetermined temperature in a short time. It is necessary to increase and decrease the temperature. However, since the amorphous magnetic alloy ribbon is thin and has irregularities on its surface, the core space factor of the wound core is as small as about 80%. For this reason, when the wound core is annealed in a magnetic field, the thermal conductivity in the direction of the winding thickness deteriorates, and a difference between the surface temperature and the internal temperature of the wound core tends to occur. especially,
Due to the large size of a large wound core, there is a large temperature difference between the surface of the core and the inside of the core, resulting in uneven temperature distribution, making it difficult to raise and cool down the entire wound core uniformly in a short period of time. . For this reason, the magnetic properties of small wound cores tend to deteriorate, and measures must be taken to make the temperature distribution inside the core uniform during annealing.

In other words, when manufacturing a large-sized wound core using this amorphous magnetic alloy ribbon, measures are not taken to improve the rigidity of the wound core and to make the temperature distribution inside the wound core uniform during annealing in a magnetic field. There was a problem that the magnetic properties deteriorated.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a method for manufacturing a wound core that can improve the rigidity of the wound core and produce a large-sized wound core that can sufficiently exhibit the excellent magnetic properties that are the inherent characteristics of an amorphous magnetic alloy ribbon. It is something.

[Summary of the invention]

The method for manufacturing a wound core of the present invention involves winding a plurality of amorphous magnetic alloy thin strips in the width direction of the core, using aluminum or copper, which has good thermal conductivity and has a width dimension that is approximately equal to the total core width. A reinforcing plate made of a metal of , the temperature difference between the inside and outside of the wound core during annealing in a magnetic field is reduced, the temperature distribution is made uniform, and deterioration of magnetic properties is prevented.

[Embodiments of the invention]

An embodiment of the present invention illustrated in the drawings will be described below. 1 to 3 show an example in which the present invention is applied to the production of a wound core in which two amorphous magnetic alloy ribbons are combined.

As shown in Figure 1, two long amorphous magnetic alloy ribbons I
k, , IB are lined up in the width direction of the core and simultaneously wound to a predetermined winding position. In this winding operation, a winding form (not shown) is rotated by a winding machine, and the amorphous magnetic alloy ribbon JA is fed from the supply reel 4.4.

This is done by unwinding the IBs, arranging them on a winding form, and winding them up. Next, the reinforcing plate 2 is attached to the already wound amorphous magnetic alloy ribbon 1 between the outer periphery of the wound body of IB and the subsequently wound amorphous magnetic alloy ribbons IA and JR. While inserting it into
Roll it up one turn together with the amorphous magnetic alloy ribbons IA and IB.

The reinforcing plate 2 is made of a metal such as aluminum or copper that has good thermal conductivity, and has a width that is approximately equal to the total core width and a winding of the amorphous magnetic alloy thin strips JA and JB in the inserted part of the wound core. It is formed as a strip with a length dimension that matches the length. Note that this reinforcing plate 2 is made of amorphous magnetic alloy ribbon JA,
The board is thicker than ZB. Then, repeat the above winding operation, insert one turn of reinforcing plate 2 at each predetermined winding position, and wind the amorphous magnetic alloy ribbons JA and JB to the predetermined outer diameter while winding. do.

FIG. 2 shows a wound core 3 manufactured by such a method, and FIG. 3 is an enlarged cross-sectional view thereof taken along the line 11-1. In the wound core 3, reinforcing plates 2 are inserted at a plurality of winding positions spaced apart in the direction of the winding thickness. Since the reinforcing plate 2 is cut equally to the entire core width, it is inserted across the width direction of the amorphous magnetic alloy ribbons IA and IB. Therefore, in the wound core 3,
The reinforcing plate 2 with a large plate thickness allows the amorphous magnetic alloy ribbon I
Since A and IB are connected and reinforced, the core rigidity is improved. In addition, amorphous magnetic alloy ribbon I
A and IB tend to cause misalignment in the core width direction between the ribbons, but this misalignment is suppressed by the reinforcing plate 2, and a strong wound core 3 with a good core shape can be obtained. Therefore, when assembling the wound core 3, it is possible to prevent the wound core 3 from being deformed by external force and the magnetic properties of the amorphous magnetic alloy ribbons IA and IB from being deteriorated by the addition of stress.

Furthermore, the wound core 3 is annealed in a magnetic field to remove the strain in the amorphous magnetic alloy ribbons JA and JH.

When this annealing is performed, the temperature difference between the surface and the inside of the wound core 3 can be reduced to make the temperature distribution uniform. That is, as described above, the range of appropriate annealing conditions for an amorphous magnetic alloy ribbon during magnetic field annealing is very narrow, and the magnetic properties vary greatly depending on the annealing conditions. In particular, with large wound cores, there is a large temperature difference between the core surface and the inside of the core due to the large size, so it is necessary to equalize the temperature distribution of the wound core. In the present invention, the reinforcing plate 2 made of a metal such as aluminum or copper, which has a higher thermal conductivity than the amorphous magnetic alloy ribbon JA, 2B, is inserted inside the wound core 3 and wound. 3, the heat conduction in the direction of the winding thickness is improved, and the temperature distribution inside the winding core 3 is made uniform. , annealing can be performed within the range of appropriate annealing conditions, improving magnetic properties such as iron loss, and producing amorphous magnetic alloy ribbon 1.
In addition, the inherent low loss characteristics of IB can be exhibited.

The diagram in FIG. 4 shows the rise and fall temperature curve during annealing in a large wound core. Solid lines a and b in the figure indicate the temperature curves on the core surface and inside the core of the wound core according to the present invention, respectively,
Further, broken mc and d indicate the temperature curves on the core surface and inside the core, respectively, due to a conventional wound core. From Figure 9, in the present invention, the difference between the surface temperature and internal temperature of the wound core at the appropriate annealing temperature of 400°C is smaller than in the conventional example9.
Moreover, it is recognized that the difference in the holding time between the surface temperature and internal temperature of the wound core at the appropriate annealing temperature is also small.

For this reason, the magnetic properties of a large wound core using multiple strips of amorphous magnetic alloy ribbon are improved after annealing in a magnetic field.

〔Effect of the invention〕

As explained above, according to the present invention, when forming a wound core by arranging a plurality of amorphous magnetic alloy ribbons in the core width direction, the entire amorphous magnetic alloy ribbon is completely wound at each predetermined winding position. Since a reinforcing plate made of a metal with good thermal conductivity and having a width equal to the core width is inserted, the rigidity of the wound core can be improved. Also,
When strain-relieving and annealing the wound core, the magnetic properties of the amorphous magnetic alloy ribbon can be improved by using reinforcing plates with good thermal conductivity to make the temperature distribution of the wound core uniform.

Therefore, it is possible to obtain a large-sized wound core made of an amorphous magnetic alloy ribbon that has high core rigidity and can exhibit good magnetic properties.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the method for manufacturing a wound core of the present invention, FIG. 2 is a perspective view showing the wound core, and FIG. 3 is a diagram of FIG.
FIG. 4 is an enlarged cross-sectional view taken along line 11-1, and is a diagram showing rising and falling temperature characteristic curves during annealing of wound cores in the present invention and a conventional example. JA, JB...Amorphous magnetic alloy ribbon, 2...Reinforcement plate, 3...Wound iron core. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 4 Space (Hr)

Claims (1)

[Claims] When winding a plurality of amorphous magnetic alloy ribbons side by side in the core width direction, each predetermined winding position of the amorphous magnetic alloy ribbon has a thermal conductivity that has a width dimension equal to the total core width. A method for manufacturing a wound iron core, which comprises inserting a reinforcing plate made of a good metal and winding this reinforcing plate together with the amorphous magnetic alloy ribbon.