JP3631553B2 - Amorphous wound iron core - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an amorphous wound core used as an iron core of a static induction electrical device such as a transformer or a reactor.
[0002]
[Prior art]
Since the amorphous magnetic material is manufactured in the form of a very thin ribbon, when the iron core is constituted by the magnetic material, it is usually in the form of a wound iron core. Since the ribbon of amorphous magnetic material is extremely thin, handling the ribbons one by one results in poor work efficiency. Therefore, a plurality of thin ribbons (two or more, usually dozens or dozens) are laminated together and cut into a length corresponding to the peripheral length of each part of the iron core to form a unit laminate. It has been practiced to form a rectangular wound iron core by laminating a large number of laminated bodies and laminating or butt-joining both ends thereof.
[0003]
FIG. 3 shows the unit laminated body Un arranged at the nth (n = 1, 2,...) From the innermost periphery of the amorphous wound core. When forming this unit laminated body, first, as shown in FIG. 5, a drum in which a strip of amorphous magnetic alloy ribbon is wound around a plurality of (5 in the illustrated example) uncoilers A1 to A5. A long strip having a thickness t by setting D1 to D5 and winding a plurality of amorphous magnetic alloy ribbon strips S1 to S5 unwound from these drums around one reel F The stacked body S is formed.
[0004]
Next, the strip laminated body S is cut into a predetermined length Ln by a cutting device (not shown) to form unit laminated bodies U 1, U 2,... That sequentially increase in length by 2πt as shown in FIG. Unit laminates U1 to U5 (5 in the illustrated example) are laminated while shifting the position of one end in the longitudinal direction by a predetermined displacement dimension ΔL to form a laminate block B1. Similarly, a predetermined number of unit laminated bodies U6, U7,... Are laminated while shifting the position of one end of each of the unit laminated bodies U6, U7,..., And forming laminated body blocks B2, B3,. These laminated body blocks are sequentially wound around a winding frame (not shown) and formed into a rectangular shape, and both ends of the unit laminated body constituting each laminated body block are butt-joined (butt joined), as shown in FIG. Get a wound core like this.
[0005]
In FIG. 2, for the sake of illustration, a considerably large gap g is shown at the butt joints at both ends of each unit laminate, but in practice this gap is made zero or sufficiently small.
[0006]
In the wound core formed in this way, a series of laminated body blocks B1, B2,... Constitute rectangular unit core blocks C1, C2,..., And these unit core blocks are arranged from the inner peripheral side to the outer periphery. A wound iron core is formed by sequentially laminating on the side.
[0007]
The number of laminated body blocks (unit core blocks) constituting the wound iron core and the number of unit laminated bodies constituting each laminated body block are not limited to the illustrated example, and are appropriately set according to the dimensions of the iron core. The
[0008]
In the example shown in FIG. 2, both ends of each unit laminate body Un are butt-joined, but joining in a state where both ends of each unit laminate body are overlapped with a predetermined overlap margin [lap joining (lap joining)] There is also a case.
[0009]
[Problems to be solved by the invention]
In the conventional amorphous wound iron core shown in FIG. 2, all the unit laminate bodies U1, U2,... Have the same thickness t. In order to obtain a low-loss wound core having excellent characteristics with such a structure, it is desirable to reduce the thickness t of the unit laminate as much as possible. However, if the thickness of the unit laminate is reduced, the unit laminate Since the number increases, man-hours for assembling the iron core increase, and it is inevitable that the manufacturing efficiency is lowered. Therefore, in this type of conventional wound core, the thickness of the unit laminate is increased to some extent. However, if the thickness of the unit laminate is increased, the spring back when forming the unit laminate into a rectangular shape increases. Therefore, there is a problem that a large force is required to form the unit laminated body on the inner peripheral side near the window portion of the iron core, and assembly is not easy.
[0010]
Therefore, as shown in JP-open flat 7-249537, the thickness of the unit laminate is disposed on the inner peripheral side of the wound core, the thickness of the unit laminate is disposed on the outer peripheral side By increasing the thickness, the spring core of the unit laminated body arranged on the inner peripheral side of the wound core is reduced, and a wound core that has been easily assembled has been proposed.
[0011]
However, in such a configuration, there is a problem in that it is difficult to improve the magnetic characteristics of the iron core because the thickness of the unit laminate body is increased at the outer peripheral portion of the iron core where the magnetic flux density is lowered.
[0012]
The object of the present invention is to prevent the springback of the unit laminated body from becoming large on the inner peripheral side of the iron core to facilitate the assembly of the iron core, and to reduce the magnetic flux on the outer peripheral side and inner peripheral side of the iron core where the magnetic flux density is reduced. It is an object of the present invention to provide an amorphous wound core that can improve the magnetic properties of the iron core by facilitating the flow of the iron.
[0013]
[Means for Solving the Problems]
The present invention is directed to a wound core composed of a thin ribbon of amorphous magnetic material. A wound iron core targeted by the present invention is a laminate comprising a plurality of unit laminates formed by laminating a plurality of amorphous magnetic alloy ribbons and sequentially laminating a plurality of units in a state shifted by a predetermined displacement dimension in the longitudinal direction. The unit has a structure in which three or more unit core blocks are stacked as a unit core block formed by forming a block into a rectangular shape and laminating or butt-joining each longitudinal end of each unit laminate. In addition, each joint portion of the plurality of unit laminated bodies constituting each unit core block is arranged in a step-like manner distributed on one yoke portion of the iron core.
[0014]
In the present invention, the unit laminated body constituting each of the unit core blocks arranged on the inner peripheral side and the unit core block arranged on the outer peripheral side is formed thinner than the unit laminated bodies constituting the other unit core blocks. .
[0015]
That is, in the present invention, the unit core block (singular or plural) constituted by the unit laminate body having the thickness t set relatively large is replaced by the unit core block (single or plural) formed by the unit laminate body having the thickness t set small. The structure is sandwiched between the peripheral unit core block and the peripheral unit core block.
[0016]
Since many magnetic fluxes flow on the inner and outer peripheral sides of the wound core, the unit core block disposed on the inner peripheral side and the unit core block disposed on the outer peripheral side are configured as described above. When the thickness of the unit laminated body is made thinner than the thickness of the unit laminated body constituting the unit core block disposed in the other part, the magnetic properties of the iron core can be improved. In addition, the unit core blocks other than the unit core blocks respectively arranged on the inner peripheral side and the outer peripheral side are configured by a unit laminate body having a large thickness. Therefore, the increase in the number of man-hours for assembling the core is suppressed, and the cost is increased. Can be suppressed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a main part of a wound core 1 according to the present invention. This wound core is entirely composed of left and right leg portions 1a and 1b, an upper yoke portion 1c, and a lower yoke portion 1d. It is comprised so that a substantially rectangular shape may be exhibited.
[0018]
1, U1, U2,... Are unit laminated bodies formed by laminating amorphous magnetic alloy ribbons as shown in FIG. 3, and are arranged in a state of being sequentially laminated from the inner peripheral side to the outer peripheral side of the iron core. The series of unit laminate bodies U1, U2,... Is longer by 2πt.
[0019]
In constructing the wound core 1, as shown in FIG. 4, a predetermined number of unit laminated bodies U1, U2,... Are laminated in such a state that one end of each longitudinal direction is shifted and the dimension ΔL is shifted. Are formed into a rectangular shape by sequentially winding these laminated blocks around the outer periphery of a rectangular winding frame (not shown) and constituting each laminated block. Both ends of the unit laminate are butt-joined at the upper yoke part 1c of the wound iron core.
[0020]
In the wound core 1 configured as described above, unit core blocks C1, C2,... Are constituted by the laminated blocks B1, B2,. These unit core blocks C1, C2,... Are arranged in a state of being sequentially laminated from the inner peripheral side to the outer peripheral side of the iron core, and the joints at both ends of the unit laminate constituting each laminate block are upper yoke parts. It arrange | positions in the state distributed stepwise in the part of 1c.
[0021]
In the present invention, instead of making all the thickness t of the unit laminated body constituting the wound core equal, the unit core block disposed on the inner peripheral side and the unit core block disposed on the outer peripheral side are respectively The unit laminated body to be formed is formed thinner than the unit laminated body constituting the other unit iron core block.
[0022]
In the example shown in FIG. 1, the thickness of the unit laminated bodies U1 to U5 constituting one unit core block C1 arranged on the innermost circumference side and one unit core block C3 arranged on the outermost circumference are constituted. The thickness of the unit laminate bodies U11 to U15 is set to be sufficiently thinner than the thickness of the unit laminate bodies U6 to U10 constituting the iron core block C2 disposed in the intermediate portion, and is constituted by a unit laminate body having a small thickness. Between the inner peripheral unit core block C1 and the outer peripheral unit core block C3, another unit core block C2 formed with a large thickness is sandwiched.
[0023]
Here, the thickness of the unit laminated body that constitutes each of the inner peripheral unit core block C1 and the outer peripheral unit core block C3 is within a range that does not significantly increase the number of man-hours for laminating the iron core. In addition, the magnetic flux density on the outer peripheral side is increased so as to improve the magnetic characteristics of the iron core. Further, the thickness of the unit laminated body constituting the unit core block C2 arranged in the intermediate portion is set to be relatively large in preference to reducing the man-hour of the iron core laminating work as in the prior art.
[0024]
After the rectangular wound core is constructed as described above, the iron core is placed in an annealing furnace and annealed, thereby maintaining the rectangular shape of the iron core and improving the magnetic properties of the amorphous magnetic alloy.
[0025]
When a transformer is configured by mounting a winding on the above wound core, a cover is attached so as to cover the left and right legs 1a and 1b and the lower yoke portion 1c as necessary, or these After taking measures to prevent the amorphous magnetic alloy fragments from being generated from the iron core by applying an appropriate protective coating to the portion, the joint existing in the upper yoke portion 1c is opened to the left and right, and the leg portion 1a and A winding is fitted to 1c. After fitting the windings to the leg portions 1a and 1b, rejoin the joint portion of the upper yoke portion 1c, and attach a cover to the upper yoke portion 1c as necessary, or apply an appropriate protective coating. To complete the main body of the transformer.
[0026]
In the above description, the wound core is composed of three unit core blocks. However, in the present invention, the number of unit core blocks constituting the wound core may be three or more, and the number is not limited.
[0027]
In the example shown in FIG. 1, each unit core block is composed of five unit stacks. However, in the present invention, the number of unit stacks constituting each unit core block is arbitrary, and for each unit core block The number of unit laminates may be different.
[0028]
The thickness of the unit laminate constituting the inner peripheral unit core block and the thickness of the unit laminate constituting the outer peripheral unit core block may be the same or different.
[0029]
As described above, when the thickness of the unit laminated body constituting the unit core block disposed on the inner peripheral side and the outer peripheral side of the wound core is reduced, the magnetic flux density on the inner peripheral side and the outer peripheral side of the core is made higher than that of the conventional one. Therefore, the magnetic properties of the iron core can be improved.
[0030]
The present inventor configures the unit core block arranged on the inner peripheral side as in the present invention when the thickness of the unit laminated body constituting all the unit core blocks of the amorphous wound core is made the same. The thickness of the unit laminate and the thickness of the unit laminate constituting the unit core block arranged on the outer peripheral side are made thinner than the thickness of the unit laminate constituting the other unit core block. Experiments were conducted to measure the magnetic flux density of each part. In this experiment, as shown in FIG. 6, an amorphous wound core composed of unit core blocks C1 to C5 was used, and the average magnetic flux density was variously changed to measure the magnetic flux density of each unit core block. FIG. 7 shows the measurement results, in which the vertical axis represents the magnetic flux density and the horizontal axis represents the measurement location (unit core block). 7 are the cases where the thickness of the unit laminated body constituting all the unit core blocks C1 to C5 is increased. The polygonal line B is the average magnetic flux density when the average magnetic flux density is 77%. Is 100%. From these results, it can be seen that in the amorphous wound iron core, the magnetic flux density on the inner peripheral side and the outer peripheral side is lower than the magnetic flux density at the center.
[0031]
A transformer using a normal amorphous wound core is designed with an average magnetic flux density of 100%. Therefore, the thickness of the unit laminated body constituting the unit core block C1 arranged on the inner peripheral side and the thickness of the unit laminated body constituting the unit core block C5 arranged on the outer peripheral side are determined as other unit laminated body blocks C2 to C2. About the case where it made thinner than the thickness of the unit laminated body block which respectively comprises C4, the average magnetic flux density was made into 100%, and when the magnetic flux density of each part was measured, the result of the broken line C of FIG. 7 was obtained. Thus, according to the present invention, it can be seen that the magnetic flux density on the inner peripheral side and the outer peripheral side of the wound iron core can be increased as compared with the case of the broken line B showing the conventional example having the same average magnetic flux density.
[0032]
In the above description, the unit laminated body is wound around a rectangular winding frame to form a rectangular iron core, but after a plurality of unit laminated bodies are sequentially wound around a circular winding frame to form a circular winding core, The present invention can also be applied to the case where the circular wound core is formed into a rectangular shape by forming the circular wound core.
[0033]
【The invention's effect】
As described above, in the present invention, the unit core block is disposed in the other portion with the thickness of the unit laminated body constituting the unit core block disposed on the inner peripheral side and the outer peripheral side of the wound core. Since the magnetic flux density on the inner peripheral side and outer peripheral side of the iron core is made higher than that of the conventional one by making it thinner than the thickness of the unit laminated body, there is an advantage that a wound core having better magnetic properties than before can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing a main part of an embodiment of the present invention.
FIG. 2 is a front view showing a main part of a conventional wound iron core.
FIG. 3 is a perspective view showing a structure of a unit laminated body used for constituting an amorphous wound iron core.
FIG. 4 is a perspective view showing a structure of a laminated body block used for constituting an amorphous wound iron core.
FIG. 5 is a configuration diagram of an apparatus used to form a unit laminate body.
FIG. 6 is a perspective view showing a half part of an iron core used in an experiment for measuring the magnetic flux density of each part.
7 is a diagram showing the results of measuring the magnetic flux density of each part of the iron core shown in FIG. 6 with various changes in the average magnetic flux density.
[Explanation of symbols]
1 wound iron core 1a, 1b leg 1c upper yoke part 1d lower yoke part U1-U15 unit laminated body B1-B3 laminated body block C1-C3 unit iron core block

Claims (1)

Each of the unit laminated bodies formed by laminating a plurality of thin ribbons of amorphous magnetic material is formed into a rectangular shape by sequentially laminating a plurality of unit blocks in a state shifted by a predetermined displacement dimension in the longitudinal direction. Each unit core block has a structure in which three or more unit core blocks are stacked, each unit core block having a structure in which one unit core block is formed by laminating or butt-joining both longitudinal ends of each unit laminate. In the amorphous wound iron core in which each joint portion of the unit laminated body is distributed stepwise in one yoke portion,
It is characterized in that the unit laminated bodies constituting the unit core blocks arranged on the inner peripheral side and the unit core blocks arranged on the outer peripheral side are formed thinner than the unit laminated bodies constituting the other unit core blocks. Amorphous wound iron core.

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