JPH04302110A - Amorphous core transformer - Google Patents

Abstract

PURPOSE:To obtain an amorphous core transformer having excellent workability in reassembling core when a coil is installed and also having excellent magnetic characteristics by suppression to the smallest limit the increase in external shape of the cut-lap core using amorphous magnetic material. CONSTITUTION:A lapping part (s), on which blocks 1,2,3... and (n) are alternately wound from a distance (a) on both sides of the X-X line of the symmetrical center line of a core yoke part 6 where one end of the lap part (s) is fastened to each block of an amorphous magnetic material, is provided. Lapping margines s1, s2,s3... and sn are gradually increased at least by a prescribed amount in each block, the limit of the lapping part (s) is the 45 deg. line of the corner of the yoke part, and when the 45 deg. line is exceeded, the lapping margine is restored to the position of the lapping part (s) of the block 1 or 2, and then the blocks are wound by successively increasing the lapping margine from the same size of the lapping margines s1 and w2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous core transformer, and more particularly to a joining structure for the lap portion of a cut-lap core transformer using an amorphous magnetic material.

0002

2. Description of the Related Art A conventional cut-lap iron core transformer using an amorphous magnetic material is constructed so that the joint portion wraps at one predetermined position, as shown in FIG. Further, Japanese Patent Application Laid-Open No. 59-175110 discloses a wound core constructed of a step lap joint block and a lap joint block.

0003

[Problems to be Solved by the Invention] The above-mentioned prior art shown in FIG. 8 has a problem in that the outer dimensions of the core increase due to an increase in the lamination thickness at that location because the joints overlap at one location. . Furthermore, in the conventional technology, since the wrap margin is constant, the wrap portion of the core is opened in a U-shape and then the coil is inserted and assembled. At this time, the separation margin c of each magnetic material piece is ( Thickness of magnetic material/2)×π. For example, if the plate thickness is 0.3 mm, the separation margin c is as small as 0.47 mm according to the above calculation formula, so by moving the stopper 10 in contact with the separation margin c in the direction of arrow A, annealing will cause magnetic The urging force applied to the material closes both ends of the U-shape and reassembles the core.
There was a problem in that it became difficult to separate the so-called magnetic material terminals.

An object of the present invention is to provide an amorphous core transformer which minimizes the increase in the outer dimensions of the core and has excellent workability for reassembling the core and excellent magnetic properties.

[0005]

Means for solving the above problems are described in the claims. That is, an object of the present invention is to position one end of the wrap portion s of each block at a predetermined distance a on both sides of the center line of symmetry of the core yoke portion,
The wrap portions s are alternately shifted in the yoke portion of the iron core for each block, and the wrap portions s1 to s are wrapped for each block.
In addition to gradually increasing n by at least a predetermined amount, the end of the wrap portion s is limited to the 45° line passing through the corner of the yoke portion 6, and if it exceeds the 45° line, it is returned to the position of the wrap portion s of the innermost block. This is achieved by laminating the layers by sequentially increasing the wrapping margin starting from the same size as the wrapping margin s1 or s2. In addition, in order to suppress the increase in the outer dimensions of the core, the wrap margin is made constant for each block, and the position of the wrap portion s is shifted from the yoke straight portion to the corner portion, so that the end of the wrap portion s is located at the yoke portion 6. This is achieved by arranging that when the position exceeds the 45° line passing through the corner of the block, it is returned to the same relative position as the wrap portion s of the innermost block, and thereafter the wrap position is sequentially shifted again.

[0006]

[Operation] With the above configuration, the cross-sectional area of the lap portion is approximately 2
By doubling it, the magnetic flux density of the magnetic field generated in the coil becomes 1/2, and as a result, the magnetic loss in the lap portion is reduced, and the leakage magnetic flux to the outside of the iron core is almost eliminated, and the magnetic properties are greatly improved. In addition, since the magnetic material ends of each block of the iron core are wrapped, each block is stacked sequentially by pressing down on the lower layer of the wrap, so there is no damage caused by the rubbing of both end faces as in the conventional method. Iron core assembly becomes easier. In addition, since the end of the lap part moves from the center part to the corner part, the iron core is opened in a U-shape when it is combined with the coil, but at this time, it is necessary to separate one block from the next block to be separated. The difference in height, that is, the separation margin, is (Δt/2)×π+b, making separation easier.

[0007] Here, Δt indicates the thickness of one block of magnetic material, and b is a constant value set in advance for the wrap portion s.

Furthermore, by keeping the lap margins s1 to sn at constant values and shifting them sequentially from the yoke 1.5 times or less, and the overall height of the wound core can be reduced.

[0009]

[Embodiments] Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a front view showing the configuration of an embodiment of an amorphous core transformer according to the present invention, and FIG. 2 is an enlarged view of the lap portion s of the lower yoke portion in FIG. In Figure 1, a plurality of blocks formed by closely adhering amorphous magnetic material sheets are sequentially wound with wrap portions s provided to form an iron core, and after annealing, this is once opened into a U-shape (Fig. 5) shows an iron core transformer formed by inserting the coil 11 into the inside and then reassembling the core part 7 and the yoke part 6.
It consists of As illustrated, the wrap portion s is provided on the lower yoke portion 6.

In this embodiment, the number of amorphous magnetic material pieces in one block is 10 to 30, and the wrap portion s is sequentially formed from the innermost first block 1 to the outermost nth block.
The blocks are stacked so that the blocks have overlap margins s1, s2, . . . , sn. In other words, the symmetry center line X of the yoke portion 6
- A first wrapping margin s1 is provided at a position shifted by a predetermined dimension a from the X-ray, and the ends are overlapped with each other. Next, a second block 2 having a second wrapping margin s2 is formed on the opposite side of the first wrapping margin s1 with respect to the X-X line, shifted by a predetermined dimension a. The predetermined dimension a is 5 to 30 mm,
Appropriately, the first and second wrapping margins s1 and s2 are 5 to 30 mm.

The third block 3 is provided with a third lap margin s3 on the same side as the first block 1, shifted by a predetermined dimension a. The third wrapping margin s3 is set to be larger than the first wrapping margin s1, and if the increment is b, the third wrapping margin s3 is set as s3=s1+b. The fourth block 4 has a predetermined dimension a from the X-X line at a position opposite to the third block 3.
A fourth wrapping margin s4 is provided by shifting by s4 = s2.
+b.

In this way, the wrap portions s are sequentially provided so that sn=sn-2+b is satisfied up to the n-th block where the end of the n-th wrap sn is coincident with the 45° line of the corner portion of the yoke portion 6. When the end of the n-th lap sn exceeds the 45° line, the shape of the core affects the laminated thickness of the core portion 7, causing the core portion 7 to swell outward. In this embodiment, the number of wrap portions s from the first block to the nth block is 2 to 15 on one side.

When the end of the n-th wrap section reaches the limit exceeding the 45° line, if the first block to the n-th block are set as the first unit 8, the wrapping margin of the next n+1 block will be sn+1. The position of is shifted by a from the center line of symmetry of the straight part of the yoke 6 to match the position of the lap margin s1.
It is constructed in the same manner as Unit 8, and is wound until the core has a predetermined thickness. The number of blocks in each unit does not necessarily have to be equal. In the amorphous wound core configured in this way, the magnetic flux density in the lap portion s is 1/2 of that in other portions, and the magnetic properties are improved.

FIG. 6 is a characteristic diagram comparing the relationship between the magnetic flux density and iron loss of the wrap core core A according to the embodiment of the present invention and the conventional uncut core core B, and FIG. 7 similarly shows the relationship between the magnetic flux density and the excitation capacity. The comparative characteristic diagram shows that both wrapped core core A and uncut core core B have almost the same characteristics, and overall there is no significant difference in the characteristics of the amorphous core between wrapped core A and uncut core B. It is not allowed. Since the lap portion s is added by a predetermined amount b to the increment due to the block thickness, it becomes easy to separate the n-th block and the (n-2)th block on the same side.

Another embodiment is shown in FIG. FIG. 4 is an enlarged view showing details of the wrap portion s by a wrap method different from that shown in FIG. This is to provide each wrap portion s alternately on the left and right from the X-X line of the yoke 6, but when compared with FIG.
The second wrapping margin s1 and the second wrapping margin s2 are the same as those in the embodiment shown in FIG. 2, and their dimensions are suitably 10 to 30 mm. The end position of the third wrapping margin s3 is the same as in FIG. 2, but the wrapping margin is equal to s1, and the fourth wrapping margin s4 is equal to the second wrapping margin s2. Moreover, this embodiment is characterized in that the upper and lower wrap portions s located in the same direction do not overlap with each other. In this way, the blocks are sequentially stacked so that the end of the n-th lap part s is located at the yoke corner part.
When the process reaches the 5° line, the first unit is completed, and the process returns to the center again to form the second unit 9.

With the above structure, the laminated thickness of the lap part s is approximately 1.3 times that of the core part, making it possible to reduce the overall height of the core, and there is no significant difference in magnetic properties from that of the uncut core. Further, regarding the separation of the blocks from the U-shaped open state, the same effect as the embodiment shown in FIG. 2 is obtained.

The embodiment shown in FIG. 3 is based on the wrapping method of the embodiment shown in FIG. 2, but only the first block 1 is overlapped so that the wrapping margin s1 is reversed from the inside to the outside from that in FIG. It is something. As a result, the second block 2
They are stacked so that they are approximately parallel to the line of the inner frame, making assembly easier.

FIG. 5 shows a state in which the yoke wrap portion of the embodiment shown in FIG. 1 is opened, and the value of the separation margin c required for separation is (Δt/2)×π+b. The two-dot chain line in the figure shows the wrapped state in which the first and second blocks are assembled from the innermost side.

According to the above embodiment, the amorphous magnetism, which is extremely brittle in terms of material, can be made from cut ends by providing a wrap portion s for each block, which suppresses the increase in magnetic flux density and does not impair the magnetic properties compared to an uncut core. The blocks do not come into contact and are damaged, and the work of separating each block becomes easy. Each block presses down the lap part s of the block below and wraps it one after another, improving the workability of core assembly.

[0020]

[Effects of the Invention] By carrying out the present invention, the increase in the outer dimensions of the core at the lap portion is suppressed to a minimum, making it easier to separate the ends of the magnetic material when reassembling the amorphous core, and reducing costs by improving assembly workability. It is possible to provide an amorphous iron core transformer that is extremely effective and has excellent magnetic properties.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of an amorphous core transformer of the present invention.

FIG. 2 is an enlarged view showing a lap portion of the wound core of FIG. 1;

FIG. 3 is an enlarged view showing a lap portion of a wound core according to another embodiment of the present invention.

FIG. 4 is an enlarged view showing a lap portion of a wound core according to still another embodiment of the present invention.

FIG. 5 is a diagram showing an open state of the wrap portion of the embodiment shown in FIG. 1;

FIG. 6 is a characteristic diagram comparing the relationship between magnetic flux density and iron loss of a wrap core core A according to an embodiment of the present invention and a conventional uncut core core B. FIG.

FIG. 7 is a characteristic diagram comparing the relationship between magnetic flux density and excitation capacity of a wrap core core A according to an embodiment of the present invention and a conventional uncut core core B.

FIG. 8 is a diagram showing an open state of a conventional wrap portion.

[Explanation of symbols]

1 to n 1st to nth blocks 6 Yoke part 7 Core part 8 1st unit 9 2nd unit 10 Stopper 11 Coil a Wrap shift amount b Wrap constant value c Separate s Wrap part s1~sn Rap it

Claims (4)

[Claims] 1. An amorphous core transformer having a laminated core in which a plurality of blocks made of at least one amorphous magnetic material are sequentially wound, each block starting at a distance a on either side of a center line of symmetry of a yoke portion. Wrap portions s are provided alternately, and a wrap portion s is provided for each block.
1. An amorphous iron core transformer, characterized in that 1 to sn are configured to gradually increase by at least a predetermined amount. 2. The end of the wrap portion s is configured to return to the position of the wrap portion s of the innermost block when the end exceeds a 45° line passing through the corner of the yoke portion. 1. The amorphous iron core transformer according to 1. 3. The amorphous core transformer according to claim 1, wherein only the innermost block has a structure in which the inside and outside of the wrap portion are reversely overlapped. 4. An amorphous core transformer having a laminated core in which a plurality of blocks made of at least one amorphous magnetic material are sequentially wound, each block having a wrap portion s on both sides of a center line of symmetry of the yoke portion. The wrap portions s which are alternately provided and located on the same side change their positions block by block toward the outside of the symmetry center line with a certain wrap margin so as to at least not overlap with each other,
The end of the wrap portion s passes through the corner of the yoke portion 4
An amorphous-wound iron core transformer characterized in that it is configured to return to the position of the wrap portion s of the innermost block when the 5° line is exceeded.