JPH08227816A - Amorphous wound core - Google Patents

Abstract

PURPOSE: To increase a productivity and magnetic characteristics of a core by forming the core in such a structure that nearly rectangular blocks which are made by winding thin belts in the stacking direction in a specified thickness and which have specified outer diameters are substantially adhered tightly to each other. CONSTITUTION: An amorphous magnetic alloy-made thin belt 2 is wound from a material hoop 4 around an iron block 3 which is nearly square and has a specified size. By this method, a set of nearly square-shaped three iron blocks 3a, 3b, and 3c, each of which has curved sections only at four corners, are adhered tightly at linear sections. At the four corners, nearly crescent-shaped spaces 7 are formed between the iron blocks 3a, 3b, and 3c. By this, over- tightening is prevented at the corners of a core and thereby the transmission of excess compressive force to the inside of a core window can be prevented and the deterioration in characteristics of the amorphous magnetic alloy-made thin belts can be remarkably lessened.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous magnetic alloy wound iron core. BACKGROUND OF THE INVENTION Recently, an attempt has been made to construct an iron core of an induction electric appliance such as a transformer by using a ribbon of an amorphous magnetic alloy, and to significantly reduce the iron loss as compared with a conventional silicon steel sheet. It is being actively conducted. The ribbon of this amorphous magnetic alloy is made of metal (Fe, Co
Etc.) and non-metallic elements (B, Si, etc.) are sprayed from a nozzle onto a drum that rotates at high speed and are super-cooled to produce a very thin, approximately 30 μm thick, hard and brittle property. Have Since it is usually not easy to manufacture a laminated core using a ribbon of an amorphous magnetic alloy having such a property, it is generally used as a wound core, but if it is rapidly cooled, there is a large residual strain and the original Since low iron loss characteristics cannot be fully exhibited, annealing is always performed in advance. At this time, in order to align the 180 degree magnetic domains, a magnetic field is applied in the circumferential direction of the wound core. Amorphous magnetic alloy thin ribbon winding cores manufactured in this manner are disclosed in Japanese Patent Laid-Open No. 59-27511 and FIG.
As shown in Fig. 0, the iron core blocks 1a to 1g are combined, a part of the leg and the yoke part is a straight line and the other is a curve, and the radius of the curved part is closer to the outer peripheral part. It is almost oval in shape and its cross-sectional shape is shown in Figure 1.
Most of them were almost circular as shown in 1. When it is attempted to manufacture a wound core of a ribbon of amorphous magnetic alloy having a capacity of several tens kVA to several hundreds kVA with such a structure, a thin ribbon having a plate thickness of about 30 μm is wound several thousand to tens of thousands of times. I have to turn. For this reason, an excessive winding tightening phenomenon occurs in the curved portion of FIG. 10, and the compressive force F indicated by the arrow in the drawing acts in the inward direction of the iron core window, so that the characteristics of the ribbon of the amorphous magnetic alloy, which is sensitive to stress, is significantly impaired. . In addition, if a large-sized wound iron core is manufactured by using a ribbon of an amorphous magnetic alloy, a big problem also occurs in terms of annealing. Normal annealing is carried out under the condition that the temperature is maintained in an inert gas at a temperature of 350 to 400 ° C for 1 to 2 hours, but with a large wound iron core, the annealing furnace itself that creates such an atmosphere becomes large. Inevitably, the temperature distribution of each part of the wound iron core will be nonuniform. Therefore, the outer layer side of the wound core is over-annealed and the inner side is under-annealed, and the original low iron loss characteristics of the amorphous magnetic alloy ribbon cannot be sufficiently drawn out. Then, it was an obstacle to the realization of a large wound iron core. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an amorphous wound iron core excellent in productivity and magnetic characteristics. SUMMARY OF THE INVENTION That is, according to the present invention, in an amorphous winding iron core formed by winding a ribbon of an amorphous magnetic alloy into a substantially rectangular shape, the ribbon has a predetermined thickness in the stacking direction. A first block having a substantially rectangular shape and having a predetermined outer diameter, and a substantially rectangular block having a predetermined thickness in the laminating direction and having an inner diameter substantially equal to the outer shape of the first block. At least a second block having a shape is provided, and the second block is substantially in close contact with the outside of the first block. In a preferred embodiment, the first block and the second block are formed to have substantially the same thickness in the stacking direction. In another preferred embodiment, the thickness of the second block in the stacking direction is formed to be larger than the thickness of the first block in the stacking direction. 4. In a further preferred embodiment,
The first block and the second block have a rigid member that is arranged along the inner shape of each block and is stiffer than the ribbon. BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on the illustrated embodiments. 1 (A), (B), (C) to FIG. 5 show an embodiment of the present invention. The same parts as those in the related art are denoted by the same reference numerals, and the description thereof will be omitted. In this embodiment, the wound core is divided into a plurality of amorphous magnetic alloy ribbons 2 in the stacking direction, and is composed of a plurality of core blocks 3a, 3b and 3c which are wound and annealed into a predetermined shape. By doing so, the wound core is divided in the stacking direction of the ribbons 2, and the plurality of core blocks 3 wound and annealed into a predetermined shape are formed.
Since it is composed of a, 3b and 3c, the winding tightening phenomenon and the non-uniform annealing can be prevented, and the low iron loss characteristic of the ribbon 2 of the amorphous magnetic alloy can be sufficiently secured. It is possible to obtain a possible amorphous magnetic alloy wound iron core. That is, as shown in (A) of FIGS. 1A, 1B, and 1C, a ribbon 2 of amorphous magnetic alloy is used.
Is wound from the material hoop 4 and wound around an iron core block 3 (3a, 3b, 3c) having a substantially rectangular shape and a predetermined size. Then, as shown in FIG. 2B, the exciting coil 5 is wound around the iron core block 3 formed to have a predetermined size, and a direct current or an alternating current is passed through the iron core block 3 to flow a magnetic flux. Anneal. At this time, the material is annealed in a container 6 filled with an inert gas in order to prevent the material from being oxidized. The iron core blocks 3a, 3b and 3c thus wound and annealed are assembled through necessary electric insulating materials and spacers for adjusting dimensions as shown in FIG. In this way, the iron core blocks 3a, 3b, 3c which are individually wound and annealed are assembled, and the iron core blocks 3a, 3b, 3c are similar to each other, as shown in FIG. age,
The inner diameter Ri, the outer diameter R0, and the laminated thickness t of the curved portion are made substantially the same. By doing so, as shown in FIG. 3, in the wound iron core, three sets of substantially quadrangular iron core blocks 3a, 3b, 3c whose curved portions are seen only at the four corners adhere to each other at the straight portions. , Core blocks 3a, 3b, 3c at the four corners
A space 7 with a shape close to a crescent shape is formed between the winding cores to prevent the winding tightening phenomenon at the corners of the winding core, preventing the transmission of excessive compressive force to the inside of the winding core window. Therefore, the characteristic deterioration of the ribbon of the amorphous magnetic alloy can be remarkably alleviated. Also, three core blocks 3a, 3b, 3c
Since they were annealed separately as described above, over-annealing and under-annealing due to the uneven temperature distribution of each part of the wound iron core, which is a problem when annealed integrally, is eliminated, and it is required for the amorphous magnetic alloy ribbon. Satisfactory annealing temperature conditions can be satisfied and deterioration of properties can be prevented. Further, each core block 3a, 3b,
As shown in FIGS. 4 and 5, 3c closely adheres to each other in a straight line portion and a void 7 is generated in a curved portion in a corner, so that the core width is apparently widened by the number of the space dimension g. Become. Therefore, a jig or the like can be arranged in the space 7 to facilitate the assembly of the iron core blocks 3a, 3b, 3c, and no stress that would deteriorate the characteristics of the iron core by inserting a member into the space 7 is applied. Can also be supported.
Further, even when the void 7 is left as it is, the void 7
Thus, sufficient oil cooling and air cooling can be performed through the heat generation, and heat generation inside the iron core, which is usually a problem, can be efficiently removed. In this embodiment, the iron core blocks 3a,
Although the case where the inner diameter Ri, the outer diameter R0 and the laminated thickness t of the curved portions 3b and 3c are substantially the same has been described, the present invention is not limited to this, and only the inner diameter Ri of the curved portion may be substantially the same. Voids 7 having a shape close to a crescent shape can be formed at the four corners between the core blocks 3a, 3b, 3c,
It is possible to achieve the same effect as the above case. In this case, it goes without saying that the iron core blocks 3a, 3b, 3c are formed in a substantially quadrangular shape having curved corners. Also, the number of iron core divisions (number of iron core blocks),
The winding thickness, inner and outer diameters, etc. can be appropriately selected according to the specifications and capacity of the wound core. As described above, according to this embodiment, the following effects can be obtained. (1) Since the iron core block having the same width is wound around the curved portion into a substantially square shape having substantially the same inner diameter and outer diameter,
Necessary jigs and processes are unified and workability is greatly improved. (2) Since the number of windings of the iron core (thin band) is reduced by the number of divisions of the iron core block, the winding tightening phenomenon, which has been regarded as a problem in the past, is greatly alleviated, and the deterioration of iron loss characteristics can be prevented. (3) Since the iron core is divided, it is easy to anneal, local over-annealing and under-annealing due to temperature unevenness in the iron core are eliminated, and the original low iron loss characteristic of the ribbon of the amorphous magnetic alloy is eliminated. Can be demonstrated. (4) Since voids can be formed at the four corners of the iron core, the voids can be used to assemble and support the iron core,
Further, the inside of the iron core can be cooled efficiently. FIG. 6 shows another embodiment of the present invention. In this embodiment, three sets of iron core blocks 3a, 3b, 3c
A rigid member 8 having a rigidity higher than that of a ribbon of an amorphous magnetic alloy was arranged inside the above, along the inner shape. By doing so, the mechanical strength of the wound core can be improved as compared with the case described above. That is, since the thin ribbon of the present amorphous magnetic alloy is as thin as about 30 μm and its mechanical strength is weak, it may be deformed when assembling the iron core blocks 3a, 3b, 3c and sufficient assembling accuracy. In order to solve the problem that it is not possible to secure the above, it is conceivable that the rigid member 8 is made of, for example, a silicon steel strip which is close in composition to the amorphous magnetic alloy ribbon and has rigidity. FIG. 7 shows still another embodiment of the present invention. In this embodiment, when the core width is the same and the winding thickness (lamination thickness) is large, the cores are divided like the core blocks 3b1 and 3b2, and the voids 7 are formed between them. Also in this case, the void 7 is formed in the portion where the winding thickness is large, and the same effect as the above case can be obtained. That is, in the above-described embodiments, the iron core is divided into the same iron core widths (the iron core blocks are formed), but in the present embodiment, the winding thickness is large even with the same iron core width unlike the previous examples. In this case, the portion having a large winding thickness is divided into iron core blocks 3b1 and 3b2 to form the voids 7, which is particularly effective when the iron core becomes large. Further, in the above-mentioned embodiments, an example in which the iron core is divided only in the stacking direction is shown. However, considering that the maximum iron core width is about 200 mm in the current amorphous magnetic alloy thin ribbon, a predetermined iron core is given. To make the width, iron cores must be combined in the width direction. Even in such a case, the same configuration as that shown in the embodiment is naturally possible. FIG. 8 shows still another embodiment of the present invention. In this embodiment, a steel strip 9 having mechanical strength superior to that of the amorphous magnetic alloy ribbon is disposed inside the iron core blocks 3a, 3b, 3c. And this steel strip 9 is several times to several tens times thicker than the usual thickness 30 μm of the amorphous magnetic alloy,
It was formed of an amorphous magnetic alloy having excellent mechanical strength. By doing so, each core block 3a, 3b, 3c
It is possible to prevent the deformation of the iron core due to the winding tightening phenomenon that increases inside the core, and to prevent the iron core blocks 3a, 3b,
The assembly of 3c can be facilitated. In the present embodiment, the steel strip 9 is arranged very slightly inside the core blocks 3a, 3b, 3c (with respect to the stacking thickness t), but the ratio is the stacking of the core blocks 3a, 3b, 3c. The arrangement amount is appropriately determined depending on the thickness (roll thickness) t and the degree of stress due to winding tightening. FIG. 9 shows still another embodiment of the present invention. In this embodiment, the amorphous magnetic alloy 10 having an insulating film and excellent in mechanical strength is arranged inside the iron core blocks 3a, 3b, 3c. By doing so, electrical insulation between the core blocks 3a, 3b, 3c can be ensured, and an increase in iron loss due to an eddy current flowing between the core blocks 3a, 3b, 3c can be prevented. According to the present invention, it is possible to obtain an amorphous wound iron core excellent in productivity and magnetic characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an assembly of a winding core by an iron core block of an amorphous winding core according to an embodiment of the present invention.
Is a perspective view showing a wound state of the iron core block, FIG. 7B is a perspective view showing an annealed state of the iron core block, and FIG. 8C is a perspective view showing an assembled state of each iron core block after annealing. . FIG. 2 is an enlarged plan view around a curved portion of an amorphous winding iron core according to an embodiment of the present invention. FIG. 3 is a plan view of an amorphous wound iron core according to an embodiment of the present invention. FIG. 4 shows P- of FIG. 3 of an amorphous winding iron core of one embodiment of the present invention.
It is sectional drawing which follows the P line. 5 is a graph of Q- of FIG. 3 of the amorphous wound iron core of one embodiment of the present invention.
It is sectional drawing which follows the Q line. FIG. 6 is an enlarged plan view around a curved portion of an amorphous winding iron core according to another embodiment of the present invention. FIG. 7 is a cross-sectional view around a curved portion (a portion corresponding to the line Q-Q in FIG. 3) of an amorphous winding iron core according to still another embodiment of the present invention. FIG. 8 is an enlarged plan view around a curved portion of an amorphous winding iron core according to still another embodiment of the present invention. FIG. 9 is a cross-sectional view of both straight line portions (portions corresponding to the line P-P in FIG. 3) of an amorphous wound iron core according to still another example of the present invention. FIG. 10 is a plan view of a conventional amorphous wound iron core. 11 is a cross-sectional view of a conventional amorphous wound iron core taken along line XX in FIG. [Explanation of Codes] 2 ... Amorphous magnetic alloy ribbon, 3, 3a, 3b, 3b1,
3b2, 3c ... iron core block, 4 ... material hoop, 5 ... excitation coil, 6 ... container, 7 ... void, 8 ... rigid member, 9 ... steel strip, 10 ... amorphous magnetic alloy, t ... laminated thickness (winding thickness),
g ... spatial dimensions.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akiyo Yamaguchi             46-1 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture             Hitachi Ltd. Nakajo Factory (72) Inventor Masaru Sakamoto             46-1 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture             Hitachi Ltd. Nakajo Factory (72) Inventor Koji Yamanaka             46-1 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture             Hitachi Ltd. Nakajo Factory

Claims (1)

[Claims] 1. In an amorphous winding iron core formed by winding a ribbon of an amorphous magnetic alloy into a substantially rectangular shape, the ribbon is wound in a stacking direction with a predetermined thickness and has a predetermined outer diameter. At least a rectangular first block and a substantially rectangular second block in which the strips are wound in a stacking direction with a predetermined thickness and have an inner diameter substantially equal to the outer shape of the first block, An amorphous winding iron core, characterized in that the second block is substantially brought into close contact with the outside of the first block. 2. The amorphous winding iron core according to claim 1, wherein the first block and the second block are formed to have substantially the same thickness in the stacking direction. 3. The amorphous wound iron core according to claim 1, wherein the second block is formed so that the thickness in the stacking direction is larger than the thickness in the stacking direction of the first block. 4. The first block and the second block have a rigid member that is arranged along the inner shape of each block and is stiffer than the ribbon. Amorphous winding iron core.