JPH0782956B2 - Method for manufacturing amorphous magnetic alloy laminated core - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an amorphous magnetic alloy laminated iron core.

[Conventional technology]

When forming a laminated iron core using amorphous magnetic alloy ribbon,
Since the ribbon is as thin as around 30 μm, it takes a lot of time to manufacture the iron core. In order to improve this point, it is conceivable that a laminate of a plurality of thin strips is used as a unit laminate block, and this is used to construct a laminated core.

Conventionally, as described in Japanese Patent Laid-Open No. 59-11609, it has been considered to laminate a plurality of wound thin strips by pressure molding as a unit laminated block. However, when an iron core is constructed with such unit laminated blocks, the space factor is deteriorated because only a part of the end surface of the joint between the leg and the yoke comes into contact, and the space factor deteriorates in the end surface of each unit laminated block. , The eddy current is generated in the amorphous magnetic alloy ribbon to increase the loss.

That is, as shown in FIG. 8 which shows a conventional example of a joint portion of an iron core using an amorphous magnetic alloy ribbon, a unit laminate obtained by rolling and pressing an amorphous magnetic alloy ribbon in a circle. A unit laminated block 1 of an iron core 2 formed by laminating blocks 1
At the joining position of the end portion 3 of the above, there is a disadvantage that the space factor is lowered because the void 4 is inevitably generated. Further, since each unit laminated block 1 is continuous, the eddy current i _{e is} applied to the end portion 3 of the unit laminated block 1 by the magnetic flux B flowing across the air gap 4.
Flows and eddy current loss occurs. Further, in the conventional example, since the iron core can be formed only by 90 ° joining, the magnetic flux density at the joining portion becomes high, and both the iron loss and the exciting capacity increase.

[Problems to be solved by the invention]

In the above-mentioned prior art, since the unit core block having both end faces formed by pressing the wound amorphous magnetic alloy ribbon is laminated as it is to form the iron core of the transformer or the like, the joint portion between the leg and the yoke is formed. No consideration was given to the decrease of the space factor in the magnetic field, the penetration of magnetic flux in the stacking direction, etc., and the increase of the excitation capacity due to the decrease of the space factor and the penetration of the amorphous magnetic alloy ribbon in the stacking direction. There was a problem of increased eddy current loss due to magnetic flux.

The present invention has been made in view of the above circumstances, and an object of the present invention is to smoothly manufacture the seed core and to improve a space factor at a joint between adjacent cores, that is, a joint between a leg and a yoke. At the same time, another object of the present invention is to provide a method for manufacturing this kind of amorphous magnetic alloy laminated iron core that can reduce the generated loss by eliminating the magnetic flux penetrating the amorphous magnetic alloy ribbon.

That is, according to the present invention, in manufacturing the seed core, a step of continuously laminating and press-molding amorphous magnetic alloy ribbons to form a laminated block having bent portions at both ends, and bending the laminated block. A step of cutting the end portion while leaving a part of the bent portion to form a unit laminated block, and a step of arranging and laminating the unit laminated block side by side so that a cut surface of the unit laminated block abuts an adjacent laminated block. It is intended to achieve the intended purpose without being equipped with.

[Action]

That is, according to such a method for manufacturing an amorphous magnetic alloy laminated iron core, the abutting portion between the adjacent iron core blocks is joined through the cut surface, and the space factor in the joined portion is remarkably increased. Moreover, the magnetic flux in this joint flows from the cut surface of the joint to the cut surface, and does not penetrate through the amorphous magnetic alloy ribbon in the thickness direction as in the conventional case. The generated loss can be greatly reduced.

Further, according to this manufacturing method, since a part of the unit laminated block is not cut, there is no fear that the thin strips will come apart during lamination or when carrying it, and the iron core can be smoothly manufactured. is there.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. Since the same parts as those of the prior art are designated by the same reference numerals, the description thereof will be omitted. In this embodiment, the amorphous magnetic alloy ribbon 5 is continuously laminated and pressed to form a laminated block 6, and this end portion is cut to leave a part 7 as a unit laminated block 8. The unit laminated blocks 8 are arranged side by side and laminated so that their cut surfaces come into contact with the adjacent laminated blocks. By doing so, the space factor of the joint portion between the leg and the yoke is improved, and the magnetic flux penetrating the amorphous magnetic alloy ribbon 5 is eliminated to reduce the generated loss. It is possible to obtain an amorphous magnetic alloy laminated iron core which is capable of improving the space factor in the joint portion and reducing the loss generated by eliminating the magnetic flux penetrating the amorphous magnetic alloy ribbon 5.

That is, as shown in FIG. 1 (a), the amorphous magnetic alloy thin ribbons 5 folded and folded a plurality of times are press-molded as shown in FIG. 1 (b) to form a laminated block 6. As shown in FIG. 7C, the press-molded laminated block 6 is cut at an angle θ while leaving a part (non-cutting portions) 7 at both ends thereof, and a unit laminate shown in FIG. A block 8 was prepared, and the unit laminated block 8 was used to form a bipod core shown in FIG. By doing so, it is not necessary to handle each of the amorphous magnetic alloy thin ribbons 5 as a single plate, the working efficiency is improved, and an iron core having good characteristics, that is, an amorphous magnetic alloy laminated iron core is obtained. be able to.

That is, as shown in FIG. 2 which shows the joint portion of the amorphous magnetic alloy laminated core formed by laminating the unit laminated block 8 shown in FIG. Since the contact surface is dense, the gap 4 can be made much smaller than in the conventional example, and the space factor can be greatly improved. Further, the magnetic flux B does not penetrate through the continuous amorphous magnetic alloy ribbon, and the generation of eddy current can be prevented. Further, according to the present embodiment, it is possible to realize a 45 ° junction which could not be realized conventionally, and it is possible to reduce the iron loss and the exciting capacity due to the partial concentration of the magnetic flux B.

As described above, according to the present embodiment, the workability of stacking the iron core is as good as that of the silicon steel plate, the loss is reduced due to the increase in the space factor at the joint between the leg and the yoke, and the vortex generated by the magnetic flux penetrating in the stacking direction. Current loss can be reduced.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the width of the yoke 10 is larger than that of the leg 9 in the case of a two-leg iron core. In this case as well, it can be carried out in the same manner as in the case described above, and the same effect as that in the case described above can be obtained.

That is, as shown in FIG.
When the width of 10 is increased, the angles θ ′ and θ ″ of the unit laminated block are set so that the joints between the legs 9 and the yoke 10 come into contact with each other.
You can achieve the intended purpose by changing and and manufacturing and combining.

FIG. 4 shows still another embodiment of the present invention. Although the present embodiment is a case where the shape of the legs and the yoke is not uniform in the tripod core, it can be carried out in the same manner as in the above case and the same effect as the above case can be obtained.

That is, in the case of forming a tripod core in which the legs and the yoke are not uniform in shape as shown in FIG. 7E, it is necessary to use only the unit laminated block 8 having the shape as shown in FIG. Since it is insufficient, the unit laminate block 8 is formed by cutting the laminate block 6 in parallel at an angle θ, leaving a part 7 at both ends in addition to the unit laminate block 8 as shown in FIGS. Block 8a (see FIG. 2B) and laminated block 6
A unit laminated block 8b (FIG. 2 (d) is formed by cutting one end at an angle θ, leaving a part 7 thereof, and cutting the other end uniformly from the position of the two-dot chain line in the figure by a predetermined width. ) Reference) should be prepared. By using the unit laminated blocks 8a, 8b manufactured in this way, a tripod core as shown in FIG. 8E can be constructed. In this case, both of the unit laminated blocks 8a and 8b are not cut, so that they do not come apart during handling.

FIG. 5 shows still another embodiment of the present invention. In this embodiment, the shape of the legs and the yoke is not the same as in the case described above in the case of a tripod core, but in this case as well, it can be carried out in the same manner as in the case described above, and the above-mentioned effects can be obtained. it can.

That is, in addition to the unit laminated block 8 shown in FIG. 1 described above, a unit laminated block formed by cutting a portion 7 at both ends of the laminated block 6 as shown in FIG. 8c (see FIG. 8 (b)) and as shown in FIG. 8 (c), a unit laminate formed by cutting two portions on both sides at an angle θ ₀ while leaving one portion 7 at the center of both ends of the lamination block 6. Prepare the block 8d (see FIG. 6 (d)). By doing so, a tripod core as shown in FIG. 7E can be constructed, but in this case, the unit laminated block 8d
Since the joint between the center leg and the yoke by the unit laminated block 8c does not form 90 °, the generated loss can be reduced more than in the above case.

FIG. 6 shows still another embodiment of the present invention. In the present embodiment, the unit laminated block 8e in which the legs and the yoke are formed in a strip shape with a two-leg iron core is used. In this case, the cutting operation of the laminated block and the laminating operation of the unit laminated block 8e can be made easier than in the above case.

That is, a strip-shaped unit laminated block 8e (see FIG. 2B) formed by cutting the laminated block 6 from the position of the chain double-dashed line as shown in FIG. Construct a bipod core as shown in. In this case, since the joint between the leg and the yoke is a 90 ° joint, there is some increase in generated loss, but the laminated block 6 is cut into strips, and the unit laminated block 8e formed by laminating into strips is combined. Therefore, the cutting and laminating operations can be facilitated as described above.

FIG. 7 shows still another embodiment of the present invention. In the present embodiment, the two-leg iron core is composed of a unit laminated block 8f formed by obliquely cutting the end portion of the laminated block in the laminating direction. In this case as well, it is possible to obtain the same effects as the case described before.

That is, both sides of the laminated block are cut diagonally in the direction perpendicular to the laminating direction, and at the same time, they are cut diagonally in the laminating direction to form a unit laminated block as shown in FIGS.
Make 8f. If the bipod core shown in FIG. 7C is constructed by using the unit laminated block 8f formed by obliquely cutting in both directions at the same time, the joining portion will be in the step-up state and the amorphous magnetic alloy thin film will be formed. It is possible to obtain characteristics close to when one band is laminated, and it is possible to greatly reduce the generated loss.

In each of these examples, the amorphous magnetic alloy ribbon was continuously folded to form the laminated block, but the present invention is not limited to this, and the amorphous magnetic alloy ribbon is continuously wound and formed. You may do it.

〔The invention's effect〕

As described above, according to the present invention, the space factor at the joint can be significantly improved, and the magnetic flux at the joint flows from the cut surface of the joint to the cut surface, and It is possible to greatly reduce the generated loss,
Since part of the unit laminated block is not cut,
The manufacturing work of this seed iron core can be performed smoothly.

[Brief description of drawings]

FIGS. 1 (a) to 1 (e) show a case where a bipod core of an embodiment of an amorphous magnetic alloy laminated core of the present invention is constructed, and FIG. 1 (a) shows an amorphous magnetic alloy ribbon. A side view showing a folded state, (b) a side view of the laminated block, (c) a front view showing a cut portion of the laminated block, (d) a front view of the unit laminated block, and (e) of (d). FIG. 3 is a front view of a two-leg iron core having a unit laminated block, FIG. 2 is a perspective view showing a state of a joint portion of the same embodiment, and FIG. 3 is another embodiment of the amorphous magnetic alloy laminated core of the present invention. FIGS. 4 (a) to 4 (e) are front views of a two-leg iron core, showing a case where a tripod iron core of still another embodiment of the amorphous magnetic alloy laminated iron core of the present invention is constituted. The front view showing the cut part of the laminated block, (b) the front view of the unit laminated block made from the laminated block of (a), (c) the laminated block. Front view of a cutting portion of the stick,
(D) is a front view of a unit laminated block made from the laminated block of (c), (e) is a front view of a tripod core having the unit laminated blocks of (b) and (d), and FIG. (E)
Shows a case where a tripod core of still another embodiment of the amorphous magnetic alloy laminated core of the present invention is constituted, (a) is a front view showing a cut portion of the laminated block, and (b) is (a). A front view of the unit laminated block made from (c) is a front view showing a cut portion of the laminated block, (d) is a front view of the unit laminated block made from (c), (e) is (b), ( The front view of the tripod core having the unit laminated block of d), FIG.
(C) shows a case where a bipod core of still another embodiment of the amorphous magnetic alloy laminated core of the present invention is constituted, (a) is a front view showing a cut portion of the laminated block, (b). Is a front view of a unit laminated block made from (a), (c) is a front view of a bipod core having the unit laminated block of (b), and FIGS. 7 (a) to 7 (c) are amorphous of the present invention. The present invention shows a case where a bipedal core of another embodiment of a magnetic alloy laminated core is constituted. (A) is a front view of a unit laminated block, (b) is a side view of (a), and (c) is FIG. 8A is a front view of a two-leg iron core having a unit laminated block of FIG. 8A, and FIG. 8 is a perspective view showing a state of a joint portion of a conventional amorphous magnetic alloy laminated core. 5 ... Amorphous magnetic alloy ribbon, 6 ... Laminated block, 7 ... Part of laminated block, 8,8a, 8b, 8c, 8d, 8e, 8f ... Unit laminated block, 9 ... Leg, 10 ... Yoke.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Higaki 4026 Kuji Town, Hitachi City, Ibaraki Prefecture Hitachi Research Laboratory, Hitachi, Ltd. (56) References JP 59-11609 (JP, A) JP 58 -148419 (JP, A) JP-A-57-107015 (JP, A)

Claims (3)

[Claims] 1. A method for manufacturing an amorphous magnetic alloy laminated iron core having a yoke and legs and laminated with amorphous magnetic alloy ribbons, wherein the amorphous magnetic alloy ribbons are continuously laminated. Forming a laminated block having bent portions at both ends by press molding, cutting a bent end portion of the laminated block leaving a part of the bent portion to form a unit laminated block, A method of manufacturing an amorphous magnetic alloy laminated core, comprising: arranging unit laminated blocks side by side so that a cut surface thereof abuts an adjacent laminated block, and laminating. 2. The unit laminated block is formed by obliquely cutting an end portion of the laminated block so that a joint portion between a leg of the iron core and a yoke comes into contact with each other.
A method of manufacturing an amorphous magnetic alloy laminated core according to the item. 3. The method for manufacturing an amorphous magnetic alloy laminated iron core according to claim 1, wherein the unit laminated block is formed by cutting an end portion of the laminated block obliquely in a laminating direction.