JPH09246057A - Amorphous winding iron core - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To improve the magnetic characteristics of an amorphous winding iron core constituted by a ribbon of an amorphous magnetic alloy. SOLUTION: By forming unit blocks U1, U2, ... In this order, the unit blocks U1, U2, ... Unit core block C1, C
2 and C3 are formed, and the unit core blocks are sequentially laminated to form the wound core 1. The shift dimension of the unit laminated body is set larger for the unit iron core blocks arranged on the outer peripheral side such that the unit core blocks located on the outer peripheral side of the iron core have larger intervals between the joints j of the unit laminated body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous winding iron core used as an iron core of a static induction electric device such as a transformer or a reactor.

[0002]

2. Description of the Related Art Since an amorphous magnetic material is manufactured in the form of a very thin ribbon, when the iron core is made of the magnetic material, it usually takes the form of a wound iron core. Since the ribbon of the amorphous magnetic material is extremely thin, it is not efficient to handle the ribbons one by one. Therefore, a plurality of thin strips (two or more, usually dozens or tens of sheets) 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, and the unit A rectangular wound iron core is formed by stacking a large number of laminated bodies and laminating and joining both ends thereof.

FIG. 6 shows n from the innermost circumference of the amorphous winding iron core.
The unit laminated body Un arranged at the n-th position (n = 1, 2, ...) Is shown. When forming this unit laminate,
First, as shown in FIG. 8, a plurality of units (5 units in the illustrated example)
The drums D1 to D5 on which strips of amorphous magnetic alloy ribbon are wound are respectively set on the uncoilers A1 to A5 of FIG. The strip strip S having a thickness t is formed by collectively winding the strip on the reel F.

Next, the strip laminated body S is cut into a predetermined length Ln by a cutting device (not shown), and as shown in FIG. 7, a unit laminated body U1 whose length gradually increases by 2πt.
, U2, ..., and a predetermined number (5 in the illustrated example).
The individual unit laminate bodies U1 to U5 are laminated by shifting the positions of one ends of the unit laminate bodies U1 to U5 by a predetermined displacement dimension .DELTA.L in the longitudinal direction to form a laminated body block B1. Similarly, a predetermined number of unit laminate bodies U6, U7, ... Are laminated by displacing the position of one end of each of them by a dimension .DELTA.L to form laminate blocks B2, B3 ,. As shown in FIG. 5, these laminated body blocks are sequentially wound around a winding frame (not shown) to be formed into a rectangular shape, and both ends of the unit laminated body constituting each laminated body block are butt-joined (butt joined). Get a winding iron core like this.

In FIG. 5, for convenience of illustration, a considerably large gap g is shown at the butt joints j at both ends of each unit laminated body, but in reality, this gap is made zero or sufficiently small.

In the wound iron core thus formed, a series of laminated body blocks B1, B2, ... Form rectangular unit core blocks C1, C2 ,. Side to outer peripheral side is sequentially laminated to form a wound iron core.

The number of laminated body blocks (unit iron core blocks) constituting the wound iron core and the number of unit laminated bodies constituting each laminated body block are not limited to the examples shown in the drawings, but may be appropriately changed according to the dimensions of the iron core. Is set to.

In the example shown in FIG. 5, both ends of each unit laminated body Un are butt-joined, but both ends of each unit laminated body are overlapped and overlapped with a predetermined overlap margin (lap joining). There is also.

In the conventional amorphous wound iron core shown in FIG. 5, since the displacement dimension ΔL of the unit laminated body is set to be equal in all the unit iron core blocks, the corresponding units of all the unit iron core blocks C1, C2, ... The respective joints j of the stack are arranged in a straight line in the stacking direction.

In the present specification, the correspondence relationship between the unit laminates respectively constituting the plurality of unit core blocks forming the winding core is defined by the order of arrangement of the unit laminates in each unit core block (each unit core block). The order of arrangement of the unit laminate bodies shall be counted in order from the inner peripheral side of the above.). For example, the unit laminated body U1 arranged on the innermost peripheral side of the unit iron core block C1 is arranged on the innermost peripheral side of the unit laminated body U6 and the unit iron core block C3 arranged on the innermost peripheral side of the unit iron core block C2. Corresponding to the unit laminate U11. Unit core block C1
The unit laminated body U2 arranged second from the innermost circumference of the unit core block C2 is the unit laminated body U7 arranged second from the innermost circumference of the unit iron core block C2 and 2 from the innermost circumference of the unit iron core block C3.
This corresponds to the unit laminated body U12 arranged in the second position. In general,
Nth from the innermost circumference of each unit core block (n = 1, 2,
..) corresponds to the unit laminate body arranged nth from the innermost circumference of the other unit core blocks.

[0011]

In the conventional wound core shown in FIG. 5, the joints j of the corresponding unit laminates of all the unit core blocks C1, C2, ... Are aligned in the laminating direction. However, since there are many joints on the same cross section of the upper yoke, there is a problem that the magnetic characteristics of the iron core deteriorate.

The object of the present invention is to improve the magnetic characteristics of the iron core by reducing the number of joints arranged on the same cross section in the yoke portion where the joints are arranged. To provide an iron core.

[0013]

SUMMARY OF THE INVENTION The present invention is directed to a wound iron core made of a ribbon of amorphous magnetic material. The wound core to which the present invention is directed is a laminate formed by laminating a plurality of unit laminates formed by laminating a plurality of thin strips of an amorphous magnetic material in the longitudinal direction in a state of being displaced by a predetermined displacement dimension. A body block is formed into a rectangular shape, and each unit laminated body is laminated or butt-joined at both ends in the longitudinal direction to form one unit iron core block, and has a structure in which three or more unit iron core blocks are laminated. Then, the joints of the plurality of unit laminated bodies that form each unit core block are arranged in one yoke portion in a stepwise distributed state.

In the present invention, the unit core blocks arranged on the outer peripheral side are arranged so that the unit core blocks located on the outer peripheral side have a larger interval between the joint portions of the unit laminates forming the unit core blocks. Set a large shift size for the unit laminate.

Further, in the present invention, a series of unit core blocks forming the winding core is divided into a plurality of groups arranged in order from the inner peripheral side to the outer peripheral side of the iron core, and the unit core blocks belonging to the groups located on the outer peripheral side are divided into groups. In order to widen the intervals between the joints of the unit laminates constituting the unit core block, the unit core blocks belonging to the groups arranged on the outer peripheral side may be set to have a larger displacement size of the unit laminates. Good.

With the above construction, the number of joints arranged on the same cross section in the yoke portion in which the joint portion is arranged can be reduced, so that the flow of magnetic flux in the yoke portion can be made smooth. The magnetic characteristics of the iron core can be improved.

In the present invention, the unit laminated body constituting the unit iron core block arranged on the inner peripheral side is formed thinner than the unit laminated body constituting the other unit iron core blocks, or is formed on the inner peripheral side. It is preferable that the unit laminate body forming the unit core block to be arranged and the unit laminate body forming the unit core block arranged on the outer peripheral side are formed thinner than the unit laminate bodies forming the other unit core blocks.

In the wound iron core, it is difficult for the magnetic flux to pass through on the inner peripheral side where the radius of curvature is small, and the magnetic flux density tends to be low. Therefore, as described above, when the thickness of the unit laminated body forming the unit iron core block arranged on the inner peripheral side of the iron core is made thinner than the thickness of the unit laminated body forming the unit iron core block arranged in the other portion. Since the magnetic flux can be improved on the inner circumference side of the iron core to increase the magnetic flux density, the magnetic characteristics of the iron core can be improved.

Further, since the magnetic path length is long on the outer peripheral side of the wound iron core, it is difficult for the magnetic flux to pass therethrough, and the magnetic flux density tends to be low like the inner peripheral side. Therefore, if the thickness of the unit laminated body constituting the unit iron core block arranged on the outer peripheral side of the iron core is made thinner than the thickness of the unit laminated body constituting the unit iron core block arranged in other parts, the outer periphery of the iron core Since the magnetic flux can be improved on the side to increase the magnetic flux density, the magnetic characteristics of the iron core can be improved.

Therefore, in the present invention, the thickness of the unit laminate body forming the unit core block on the inner circumference side of the iron core is made thinner than the thickness of the unit laminate body forming the other unit core blocks, or the inner circumference is made smaller. If the thickness of the unit laminates that respectively form both the unit core blocks on the side and the unit cores on the outer periphery side is smaller than the thickness of the unit laminates that form the other unit core blocks, The number of joints arranged on the same transverse cross section of the yoke is reduced by continuously or stepwise varying the displacement dimension of the unit laminates from the inner circumference to the outer circumference. Therefore, the magnetic characteristics of the iron core can be further improved.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a main part of a wound iron core 1 according to the present invention. This wound iron core has left and right leg portions 1a and 1a.
b, the upper yoke portion 1c, and the lower yoke portion 1d are configured to have a substantially rectangular overall shape.

In FIG. 1, U1, U2, ... Are unit laminates formed by laminating amorphous magnetic alloy ribbons as shown in FIG. 6, and as shown in FIG. 7, from the inner peripheral side to the outer peripheral side of the iron core. A series of unit laminated bodies U1, U2, ... Arranged in the state of being sequentially laminated to each other has a length increased by 2πt.

In constructing the wound iron core 1, as shown in FIG. 7, a predetermined number of unit laminated bodies U1, U2, ...
Layered blocks B1 and B2 are formed by stacking with one end in the longitudinal direction being displaced by a displacement dimension ΔL.
, Are formed, and these laminated body blocks are sequentially wound around the outer periphery of a rectangular winding frame (not shown) to form a rectangular shape, and both ends of the unit laminated body constituting each laminated body block are The upper yoke portion 1c of the wound core is butt-joined.

In the wound core 1 thus constructed, the rectangular laminated block B1, B2,
.. respectively form unit core blocks C1, C2, .... 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 j at both ends of the unit laminated body U constituting each laminated body block are stepwise in the upper yoke portion 1c. Are arranged in a distributed state.

In the example shown in FIG. 1, a wound core 1 is composed of four unit core blocks C1 to C4 which are sequentially laminated from the inner peripheral side to the outer peripheral side. The laminated blocks B1 to B3 respectively constituting the blocks C1 to C3 are composed of five unit laminated bodies, and the laminated body block B4 constituting the unit core block C4 arranged on the outermost peripheral side is composed of four unit laminated bodies. Has become.

In the present invention, the unit core blocks arranged on the outer peripheral side are arranged so that the unit core blocks located on the outer peripheral side have a wider space between the joint portions of the unit laminates forming the unit core blocks. Set a large shift size for the unit laminate.

In the example shown in FIG. 1, the joint parts j of the corresponding unit laminates of the unit core blocks B1 to B4 sequentially laminated from the inner circumference side to the outer circumference side are arranged in the radial direction.
The displacement dimension ΔL (see FIG. 7) of the unit laminated body is set to be smaller for the unit iron core block arranged on the inner peripheral side.

After the rectangular wound iron core is constructed as described above, the iron core is put into an annealing furnace and annealed, thereby maintaining the rectangular shape of the iron core and improving the magnetic characteristics of the amorphous magnetic alloy. To do.

When a winding is attached to the above winding core to form a transformer, a cover is attached so as to cover the left and right leg portions 1a and 1b and the lower yoke portion 1d, if necessary.
Or, after applying a suitable protective coating to these parts to prevent the fragments of the amorphous magnetic alloy from being generated from the iron core, open the joint part existing in the part of the upper yoke part 1c to the left and right, The winding is fitted on the portions 1a and 1b. After fitting the windings to the leg portions 1a and 1b, respectively, the joint portion of the upper yoke portion 1c is rejoined, and if necessary, a cover is attached to the upper yoke portion 1c, or an appropriate protective coating is provided. Apply to complete the body of the transformer.

As described above, a series of unit core blocks C
The unit stacks of 1, C2, ... Are made to have different displacement sizes in order, and the joint portions of the corresponding unit stacks of the unit core blocks C1, C2 ,. By arranging them, when the intervals between the joint parts j of the unit laminate body are continuously widened from the unit core blocks arranged on the inner peripheral side of the iron core toward the unit core blocks arranged on the outer peripheral side, Since it is possible to reduce the number of joints arranged on the same cross section in the yoke portion in which the joint j is arranged, the flow of magnetic flux in the yoke portion is smoothed to improve the magnetic characteristics of the iron core. be able to.

FIG. 2 shows another embodiment of the present invention. In this example, two unit core blocks C1 and C2 each composed of laminate blocks B1 and B2 each consisting of five unit laminates. The wound core 1 is composed of C2 and a unit core block C3 composed of a laminated body block B3 composed of four unit laminated bodies. In this example, not all the thicknesses t of the unit laminate bodies constituting the winding iron core are made the same, but the unit laminate bodies U1 to U5 constituting one unit iron core block C1 arranged on the innermost peripheral side are Unit laminates U6, U7 constituting other unit core blocks,
It is thinner than ...

In the example shown in FIG. 2, the thickness of the unit laminate forming the inner peripheral unit core block C1 does not significantly increase the number of man-hours required for laminating the iron core. Set it small enough to make it good and reduce iron loss. The thickness of the unit laminated body forming the other unit core blocks C2 and C3 is set to be relatively large in the same manner as in the conventional case, with priority given to the reduction of the man-hours required for laminating the iron cores.

FIG. 3 shows still another embodiment of the present invention. In this example, the unit laminated bodies U1 to U5 constituting one unit iron core block C1 arranged on the innermost peripheral side.
And the thickness of the unit laminates U11 to U15 constituting one unit iron core block C3 arranged on the outermost periphery are the thicknesses of the unit laminates U6 to U10 constituting the iron core block C2 arranged in the middle part. Other unit core blocks C2 formed to be thicker between the inner unit core block C1 and the outer unit core block C3 which are set to be sufficiently thinner than the unit core and are made of a thin unit laminate. Are placed in a sandwiched state.

As shown in FIG. 3, the thickness of the unit laminates forming the inner core block C1 and the outer unit core block C3 is calculated from the thickness of the unit laminates forming the other unit core blocks. In the case of making the thickness even thinner, within the range that does not significantly increase the man-hours for stacking the iron core,
In order to improve the magnetic characteristics of the iron core, the thickness of the unit laminated body constituting the inner peripheral side unit iron core block C1 and the outer peripheral side unit iron core block C3 is set to be sufficiently small, and the unit iron core block C2 arranged in the middle portion. As in the conventional case, the thickness of the unit laminated body constituting the above is set to be relatively large, giving priority to the reduction of the man-hours for the iron core laminating work.

As described above, when the thickness of the unit laminated body constituting the unit core blocks arranged on the inner peripheral side and the outer peripheral side of the wound core is reduced, the unit laminated body constituting the unit core block becomes thinner. Compared to the case where the thickness is increased, the magnetic flux can be improved on the inner and outer circumference sides of the iron core, where the magnetic flux density tends to be low, and the magnetic flux density can be increased, thus improving the magnetic characteristics of the iron core. be able to.

In the above description, the winding iron core is made up of four unit iron core blocks or three unit iron core blocks, but in the present invention, the number of unit iron core blocks constituting the winding iron core may be 3 or more, and the number thereof may be three. It doesn't matter.

In the present invention, the number of unit laminates forming each unit iron core block is arbitrary, and the number of unit laminates forming all unit iron core blocks may be equal, and a unit iron core block may be a unit. The number of laminated bodies may be different.

In the example of FIG. 3, the thickness of the unit laminated body forming the inner peripheral side unit core block C1 and the thickness of the unit laminated body forming the outer peripheral side unit iron core block C3 may be the same or different. Good.

In each of the above examples, the unit core blocks located on the outer peripheral side are arranged in order from the inner peripheral side to the outer peripheral side so that the intervals between the joints j of the unit laminated bodies forming the unit core blocks are increased. The offset dimensions of the unit laminates that make up each of the laminated unit core blocks are set to increase sequentially from the unit core blocks on the inner circumference side to the unit core blocks on the outer circumference side. A series of unit core blocks are divided into a plurality of groups which are sequentially arranged from the inner circumference side to the outer circumference side of the winding core, and unit core blocks belonging to groups located on the outer circumference side are joined to the unit laminate body forming the unit core blocks. In order to widen the interval between them, the unit iron core blocks belonging to the group arranged on the outer peripheral side may be set to have a larger displacement size of the unit laminated body. FIG. 4 shows an example in which the unit core blocks constituting the wound core are divided into a plurality of groups, and the unit stacks have different shift dimensions for each group.

In the example shown in FIG. 4, a wound iron core is formed by sequentially laminating the unit iron core blocks C1, C2, ... C7 from the inner circumference side to the outer circumference side. In this example, a series of unit iron core blocks C1 to C7 forming a winding iron core are three groups G1 arranged in order from the inner circumference side to the outer circumference side of the iron core.
G2 and G3 are divided into two unit core blocks C1 and C2 belonging to the group G1 and each of the plurality of unit laminates has the same displacement ΔL1, and the group G2 is arranged in the center of the lamination direction. The offset size of the unit laminates constituting the respective unit core blocks C3 to C5 is set to a value .DELTA.L2 larger than .DELTA.L1. Further, the shift size of the unit laminated bodies constituting the unit core blocks C6 and C7 belonging to the group G3 arranged on the outer peripheral side is set to a value .DELTA.L3 which is larger than .DELTA.L2.

That is, in the example shown in FIG. 4, a series of unit core blocks C1 to C7 constituting the winding iron core are divided into three groups G1 to G3 which are sequentially arranged from the inner circumference side to the outer circumference side of the winding iron core, and the outer circumference is divided. The unit core blocks belonging to the groups arranged closer to the outer periphery side are arranged so that the unit core blocks belonging to the group located closer to the side have a wider space between the joint portions of the unit laminate structures forming the unit core blocks. The shift size is set to a large value.

Even in the case of such a configuration, since the number of joint portions arranged on the same cross section in the yoke portion where the joint portion j is arranged can be reduced, the magnetic flux of the magnetic flux in the yoke portion can be reduced. The flow can be smoothed to improve the magnetic properties of the iron core.

When the unit core blocks forming the wound core are divided into a plurality of groups as described above, a group consisting of only one unit core block may be included in the plurality of groups.

In the above description, the unit laminated body is wound around the rectangular winding frame to form the rectangular iron core, but a plurality of unit laminated bodies are sequentially wound around the circular winding frame to form the circular winding iron core. After that, the present invention can be applied to a case where the circular wound iron core is formed into a rectangular shape to form a rectangular wound iron core.

[0045]

As described above, according to the present invention, since the number of joints arranged on the same cross section in the yoke portion where the joints are arranged can be reduced, the magnetic characteristics of the iron core can be reduced. Can be improved.

Further, in the present invention, the thickness of the unit laminated body constituting the unit core block arranged on the inner peripheral side of the wound core, or the unit core block arranged on the inner peripheral side and the unit arranged on the outer peripheral side. If the thickness of the unit laminate that constitutes both of the iron core blocks is made thinner than the thickness of the unit laminate that constitutes the unit iron core block that is placed in another part, the magnetic flux density that tends to decrease Since it is possible to improve the magnetic characteristics of the iron core by thinning the thickness of the unit laminated body in both the peripheral side portion and the peripheral side portion where the magnetic path length is long and magnetic flux does not easily flow, they are arranged on the same cross section. Combined with the reduction in the number of joints, it is possible to obtain a wound iron core having better magnetic characteristics than before.

[Brief description of 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 another embodiment of the present invention.

FIG. 3 is a front view showing a main part of still another embodiment of the present invention.

FIG. 4 is a front view showing a main part of still another embodiment of the present invention.

FIG. 5 is a front view showing a main part of a conventional wound iron core.

FIG. 6 is a perspective view showing a structure of a unit laminated body used for forming an amorphous winding iron core.

FIG. 7 is a perspective view showing a structure of a laminated body block used to form an amorphous winding iron core.

FIG. 8 is a configuration diagram of an apparatus used to form a unit laminate.

[Explanation of symbols]

 1 Winding iron core 1a, 1b Leg part 1c Upper yoke part 1d Lower yoke part U1 to U19 Unit laminated body B1 to B4 Laminated body block C1 to C7 Unit iron core block j Joint part

Claims (4)

[Claims] 1. A rectangular laminated block formed by laminating a plurality of unit laminated bodies formed by stacking a plurality of thin strips of an amorphous magnetic material in the longitudinal direction with a predetermined displacement size. Each unit laminate has a structure in which three or more unit core blocks are laminated by stacking or butt-joining the respective longitudinal ends of each unit laminate body into one unit core block, and each unit core block is laminated. In an amorphous winding core in which the joints of a plurality of unit laminates that form a block are distributed stepwise in one yoke portion, the unit core blocks that are located closer to the outer periphery side are the units that form the unit core block. In order to increase the distance between the joints of the laminated body, the unit iron core blocks arranged on the outer peripheral side are set to have a larger displacement size of the unit laminated body. Amorphous wound iron core according to claim. 2. A rectangular laminated block formed by laminating a plurality of unit laminated bodies formed by stacking a plurality of thin strips of an amorphous magnetic material in the longitudinal direction in a state of being displaced by a predetermined displacement dimension. Each unit laminate has a structure in which three or more unit core blocks are laminated by stacking or butt-joining the respective longitudinal ends of each unit laminate body into one unit core block, and each unit core block is laminated. In an amorphous winding core in which the joints of multiple unit laminates that form a block are distributed stepwise on one yoke part, a series of unit core blocks that form the winding core are arranged from the inner circumference side of the core. Divided into multiple groups lined up on the outer circumference side,
The unit core blocks belonging to the groups arranged on the outer peripheral side are arranged in such a manner that the unit core blocks belonging to the groups located on the outer peripheral side have larger intervals between the joints of the unit laminated bodies forming the unit core blocks. Amorphous wound iron core, which has a large body displacement. 3. The unit laminate body forming a unit core block arranged on the inner peripheral side is formed thinner than a unit laminate body forming another unit core block. Amorphous winding iron core. 4. A unit laminate body forming a unit iron core block arranged on the inner peripheral side and a unit laminate body forming a unit iron core block arranged on the outer periphery side are separated from unit laminate bodies forming other unit iron core blocks. The amorphous winding iron core according to claim 1 or 2, wherein the amorphous winding iron core is also formed thin.