JPH05347219A - Wound core transformer and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a wound core transformer by a method wherein the yoke part of the wound core, which is formed by winding an amorphous magnetic alloy thin band, is enveloped by an insulating material having excellent buffering efficiency. CONSTITUTION:A plurality of reinforcement frames, made of metal material thicker than iron-core material, are arranged on the inside and the outside surfaces of a wound core 27, and an insulating reinforcement part 32 and an insulating covering part 50 are formed on an iron leg part (d) and the lower yoke part before assembling of the wound core. An insulating covering part 58, which is the same as the lower yoke part, is formed on the upper yoke part after assembling, and by completely covering the wound core 27 in such a manner that its surface is not exposed to outside, the adverse effect caused by the exfoliation of an amorphous magnetic alloy thin band can be prevented completely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer using a one-turn cut type winding core made of an amorphous magnetic alloy ribbon and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, various studies have been made on the use of amorphous magnetic alloy ribbons (hereinafter simply referred to as magnetic ribbons) as core materials for wound cores used in distribution transformers and the like.
This magnetic ribbon is manufactured by rapidly quenching a melt of a magnetic alloy, and has an extremely small iron loss and excellent magnetic characteristics. Then, for example, in the case of manufacturing a transformer for distribution using the wound core made of the magnetic ribbon, a uncut type wound core having no joint formed by continuously winding the magnetic ribbon is adopted. Often. However, in the uncut type winding core, the winding has to be directly wound around the iron core, so that the winding work is troublesome and the occupation ratio of the iron core in the insulating cylinder inside the winding is improved. In order to keep it, the cross section of the iron core has a stepped shape close to a circle, which complicates the manufacturing process of the wound iron core. Besides, since the winding itself was wound using a special jig,
Inevitably, the diameter size increases, and the entire transformer becomes larger,
There is a problem that not only the weight is increased but also the manufacturing cost is inevitably increased.

On the other hand, there is also a case where a wound iron core of a one-turn cut type is used in which magnetic thin strips cut one by one are sequentially inserted into a winding. In this wound core, for example, a unit laminated core is formed by uniting a plurality of unit cores (number + sheets) obtained by cutting a magnetic ribbon for each turn, and further laminating the unit laminated core into a plurality of layers. A laminated block (hereinafter, simply referred to as a laminated block) is formed, and when the wound core is assembled, the laminated block is wound in a circle and the ends of the unit laminated core are sequentially abutted or overlapped while being joined in a staggered manner. Then, the laminated block was further wound and laminated in the same manner as the required number of layers to form a one-turn cut type winding core having a predetermined laminated thickness.

In the wound core of the one-turn cut type constructed as described above, a joint such as a butt is located on one side of the yoke portion and formed into a rectangular shape, and then magnetic field annealing is performed. After the annealing, the wound core opens the joint portion of the yoke portion for each laminated block, and as shown in FIG. 25, each laminated block 1a, 1
By sequentially incorporating b into the iron core insertion hole 2a of the winding 2 and rejoining the joining portions 3 of the laminated blocks 1a and 1b,
The winding iron core 4 was assembled after the interlinking of the magnetic circuit and the conductive circuit was completed.

[0005]

However, when the wound core of the one-turn cut type is manufactured by the conventional technique, there are various problems as described below.

(1) Since the magnetic ribbon has poor rigidity and is extremely weakened by annealing, as described above, when the cores are assembled by sequentially inserting the laminated blocks into the windings, When the laminated block collides with the winding, collides with the laminated block already incorporated in the winding, or when the transformer core is assembled using the wound core after the winding core is assembled, the laminated end face of the iron core, etc. When an external force is applied to the corners, the corners of the wound core and the laminated end faces are easily broken or peeled off to generate fragments. If the debris remains in the core insertion hole of the winding after the winding core is assembled, during operation of the transformer,
There has been a problem that the insulating oil is stranded on the convection of the insulating oil and strays, invades between the layers of the winding wire, and causes an interlayer short-circuit accident.

(2) Further, as described above, since the magnetic ribbon is poor in rigidity, when the laminated blocks are individually divided and assembled in assembling the wound core, as shown in FIG. Since the shape of No. 1 was once collapsed and the iron core was expanded by expanding the iron core for each laminated block on the side of the joint 3 side, the laminated block already inserted in the winding will undergo self-weight deformation, internal distortion, etc. Since this may cause adverse effects on the magnetic characteristics, it is necessary to pay close attention to the assembly work, and the transformer assembly work using this kind of core can be performed smoothly and efficiently. There was no problem.

(3) Further, since the magnetic ribbon is manufactured to be extremely thin and is weakened by annealing, when each laminated block is sequentially incorporated in the winding, the self-sustaining property is extremely poor, and it is crushed. It often becomes the state of. For this reason, it is necessary to make the laminated block of the previous layer inserted in the winding stand by using a special jig or the like until the laminated block of the next layer is inserted. Therefore, the assembly efficiency of the wound core is very poor, which is a major factor that hinders the mass productivity of this type of wound core and the transformer using the wound core.

The present invention solves the above-mentioned problems, reliably prevents the magnetic ribbon from peeling and breaking due to an external force at the time of assembling the iron core, prevents the generation of debris due to the damage of the magnetic ribbon, and An object of the present invention is to provide a wound iron core transformer excellent in magnetic characteristics and productivity by providing the iron core itself with self-sustaining property, and a manufacturing method thereof.

[0010]

The present invention provides a magnetic ribbon 1
A required number of reinforcing frames made of, for example, a silicon steel strip having a plate thickness thicker than that of the magnetic thin strip are arranged on the outer peripheral surface of the wound core body wound by the turn-cut method. The iron core element is formed into a rectangular shape and magnetic field annealed to form a wound iron core.After this magnetic field annealing, among the plurality of reinforcement frames arranged on the inner peripheral surface of the wound iron core, the innermost peripheral portion is positioned. Remove part of the reinforcement frame. Next, in the lower yoke part that does not have the joint part of the winding iron core, two corner parts connected to the leg iron part and three straight parts existing between these corner parts are suitable for insulating oil. In addition, an insulating member made of a resinous non-woven fabric having excellent heat resistance and flexibility and having a high porosity is used, and the laminated end face of the yoke portion is externally provided between the wound core element body and the inner and outer reinforcing frames. It is temporarily fixed by interposing it so that it can be completely covered without being exposed.

Subsequently, the leg iron portion of the wound iron core is, for example, at room temperature hardenability in order to prevent peeling of the laminated end surface of the leg iron portion weakened by annealing and to strengthen the leg iron portion itself. Partly apply the adhesive of at a predetermined interval,
In this state, a thin insulating material such as insulating paper is pasted so as to wrap around the entire leg iron portion, with one end in the lengthwise direction thereof submerged under the insulating member. , An insulating reinforcing portion is formed by winding the magnetic ribbon with an adhesive tape so that the magnetic ribbon is not stressed.

Next, by utilizing the joint portion of the winding core, the upper yoke portion side having this joint portion is opened so as to have a U-shaped planar shape in the direction of the same line as the leg iron portion, Using the opened yoke portion, the winding having the removed reinforcing frame is fitted into the leg iron portion from the opened yoke portion, and then the released yoke portion is joined to the joint portion. And rejoining to form the wound core again in a rectangular shape. At the time of reforming the opened yoke portion, as in the lower yoke portion having no joint portion, an insulating member is interposed between the reinforcing frame at the innermost circumference and the wound core to re-form the yoke portion. After joining, the insulating member is also interposed between the reinforcing frame on the outer peripheral surface side and the wound core after joining.

Then, after the winding is assembled, the temporarily fixed insulating member is opened, and, for example, a room temperature curable adhesive is applied to each laminated end surface of the yoke portions located above and below the winding core. Apply
After this, including the insulating member with the temporary fixing released, the insulating member interposed in each yoke portion was adhered to the laminated end surface of the adhesive-coated yoke portion, and this laminated end surface was completely exposed to the outside. It is characterized in that the work for assembling the winding core with the winding is completed by forming an insulating coating on the yoke portion by shielding and enclosing it.

[0014]

According to the present invention, a reinforcing frame made of a material different from that of the magnetic ribbon is provided on the inner and outer peripheral surfaces of the wound core around which the magnetic ribbon is wound, and the leg iron portion is prevented from being damaged. Insulation reinforcement is formed by winding an insulating material for insulation, and the laminated end face of the yoke part is interposed between the reinforcement frame inside and outside the winding core and the inside and outside peripheral faces of the winding core. If the winding core is weakened by annealing by wrapping it so that it is not exposed to the outside by the insulating coating, if external force is applied during assembly or mechanical vibration etc. is transmitted during transfer, the winding core Of the inner core, outer peripheral surface, and laminated end surface side can be buffered by the reinforcing frame and the insulating coating, and the wound core is damaged, causing magnetic ribbon fragments and internal distortion. To provide a wound core transformer with excellent magnetic characteristics that prevents the Rukoto can.

As described above, the wound core itself is completely wrapped by the insulating reinforcing portion and the insulating coating portion so that the laminated end surfaces of the leg iron portion and the yoke portion, which are the most vulnerable to impact, are not exposed to the outside. Since the magnetic ribbon forming the wound iron core is peeled off due to external force or the like to generate debris, this debris is securely contained inside the wound iron core and does not leak to the outside. It is possible to reliably eliminate harmful effects such as an interlayer short-circuit accident caused by the generation of fragments. Further, in the present invention, since the reinforcing frame made of, for example, a silicon steel strip, which is thicker than the magnetic ribbon, is arranged on the inner and outer peripheral surfaces of the winding iron core, the winding iron core can improve the rigidity. In combination with what can be done, it becomes possible to strengthen the self-supporting property, and it is possible to surely prevent self-weight deformation and deformation when assembling the wound core. As a result, there is no need to divide and assemble the wound core into unit laminated blocks having an appropriate thickness, and the wound core is spread in a U shape by utilizing the joint portion of the yoke portion and wound. The wound iron core can be assembled by fitting the wire into the iron core insertion hole in almost one operation. Moreover, since the insulating coating part enclosing the yoke part of the wound core uses a porous non-woven fabric with high flexibility, it has excellent cushioning properties and is exposed from the winding after the winding core is assembled. By completely covering the laminated end surface of the yoke part, it is possible to effectively absorb external force when applied and to alleviate the stress applied to the wound core. When assembling and assembling a transformer using this wound iron core, it is possible to prevent damage to the magnetic ribbon reliably and to perform smooth and good assembly work, and to significantly improve the productivity of the wound iron core made of magnetic ribbon. Can be made

[0016]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 2, 11 is a winding shaft drivingly connected to a winding machine (not shown), and the winding frame 1 has a circular shape.
2 is detachably attached, and the winding frame 12 is rotated,
Each time an amorphous magnetic alloy ribbon (hereinafter referred to as a magnetic ribbon) T is wound around the winding frame 12, the cutting device 13 cuts the magnetic ribbon T in a circular shape a predetermined number of times for one turn. A wound core element body 14 that is a prototype of the cut wound core is formed.
The winding frame 1 is used for winding the wound core body 14.
A magnetic belt (not shown) is wound around the peripheral surface of the winding core element body 14 via the guide roller 15 so that the single sheet of the magnetic ribbon cut during the winding of the winding wire 2 does not fall off the winding frame 12. It is hung.

The circular wound core element 14 wound in the above-described manner has an outermost outer periphery thereof attached with, for example, an adhesive tape (not shown), and the winding frame is wound from the winding shaft 11 while maintaining the circular state. Remove with 12. As shown in FIG. 3, the wound core body 14 removed from the winder 12 is wound around the outer peripheral surface thereof with a thickness larger than that of the magnetic ribbon T, for example, a silicon steel strip slightly over one turn. The outer reinforcing frame 16 is provided by temporarily fixing the overlapping portion with an adhesive tape or the like. On the other hand, after removing the winding frame 12 on the inner peripheral surface, as shown in FIG.
An inner reinforcing frame 17 having a substantially C-shaped plane using a silicon steel strip (the opening a is opposed to the position of the joint b of the wound core body 14) and a ring within a range not forming one turn. The innermost reinforcing frame (the abutting part c of the tip is located on the opposite side of the opening part a of the inner reinforcing frame 17) 18 in the shape is inserted and arranged to maintain the circular state of the wound core element body 14. Let

When the winding core body 14 is wound, the innermost and innermost reinforcing frames 1 are provided on the outer periphery of the winding frame 12.
The wound core element body 14 may be formed by attaching 7 and 18 in advance, winding the magnetic ribbon T, and forming the outer reinforcing frame 16 after winding.

Next, as shown in FIG. 4, the circular wound iron core element 14 is pressed simultaneously from the front / rear and left / right directions by a hydraulic press or the like through the forming plates 19 and 20 to form an oval shape. Transforms into. Then, as shown in FIG. 4, with the wound core element body 14 pressed and held in an oval shape, at a position corresponding to the yoke portion of the wound core, a pair of molding dies 21 and 22 are
The recessed grooves 23 recessed in the molds 21 and 22 are inserted and arranged so as to face each other, and in this state, the lower end between the recessed grooves 23 and 23 is a taper-shaped die whose length dimension is slightly shorter than the upper end. While press-fitting the plates 24, 24 (see FIG. 5) between the recessed grooves 23, 23 by pressing, at the same time, the oblong core element body 14 is further pressed by the forming plates 19, 20. As shown by, it is formed into a rectangular shape. After the wound core element body 14 is formed into a rectangular shape, the forming plates 19 and 20 are fixed to each other with tightening bolts (not shown), and the forming holding frame 25 is formed by forming a rectangular frame as shown in FIG. As a result, the wound core element body 14 has a rectangular shape due to the pressing biasing force of the molding holding frame 25 and the mold plate 24 press-fitted between the molding dies 21 and 22 even if the pressing of the molding plates 19 and 20 is released. Can be held satisfactorily. Further, the outer reinforcing frame 16 forms one turn into a rectangular shape, the inner reinforcing frame 17 has a U shape, and the innermost reinforcing frame 18 has a rectangular shape within a range where one turn is not formed. It is molded and held in the same manner as the body 14. Instead of forming the forming and holding frame 25 using the forming plates 19 and 20, the wound core element body 14 may be formed into a rectangular shape and then fitted and held by a separately formed forming and holding frame.

Subsequently, as shown in FIG. 5, a heat-resistant electric wire is wound from one leg iron portion d of the wound core element body 14 over the forming and holding frame 25 to thereby excite the magnetic field annealing coil. 26, and thereafter, the wound core body 14 is placed in an annealing furnace filled with an inert gas, and the exciting coil 2
At the same time, a constant current is applied to 6 and magnetic field annealing is performed at a predetermined heating temperature. After the magnetic field annealing, as shown in FIG. 6, the exciting coil 26 is removed from the wound core element body 14, the forming holding frame 25 is disassembled, and further, the concave grooves 23 of the forming dies 21 and 22,
By removing the template 24 from 23 and removing it from the wound core element body 14 together with the molding dies 21, 22, the rectangular holding state of the wound core element body 14 is released, and the wound core 27 is formed. As described above, when the magnetic field annealing is performed, the wound iron core 27 is completely shaped so as to maintain the rectangular shape, and the presence of the inner and outer reinforcing frames 16 to 18 allows the wound iron core 27 to maintain the good rectangular shape. Is possible (see FIG. 6).

Next, the innermost reinforcing frame 18 and the inner and outer reinforcing frames 16 and 17 are once removed from the wound core 27 as shown in FIG. 7, and a characteristic test of the wound core 27 is performed. In this case, in order to prevent the winding iron core 27 from losing its shape, the characteristic test may be performed with the inner and outer reinforcing frames 16 and 17 and the like being provided in the winding iron core 27 as shown in FIG. Is. Subsequently, only the inner and outer reinforcing frames 16 and 17 are rearranged in the wound iron core 27 which has been subjected to the characteristic test. When rearranging the reinforcing frames 16 and 17, as shown in FIG. 8, the lower yoke portion f located on the opposite side of the upper yoke portion e having the joint b of the wound iron core 27 is insulated from the insulating sheath portion 50. To pre-coat in a temporarily fixed state.

When forming the insulating covering portion 50, the corner portions of the yoke portion f are covered with the corner covering cloths 51 and 52 shown in FIGS. 14 and 15. That is, in the corner covering 51 shown in FIG. 14, the planar shape has a repulsive shamisen repellency, and the base tongue piece 51a is attached to the corner inside the yoke portion f with an adhesive or the like to form a fan-shaped wide portion Figure 8
As shown by the dotted line, by folding toward the outside of the corner portion of the yoke portion f, the laminated end surface of the corner portion of the yoke portion f is covered. On the other hand, the corner covering 52 shown in FIG. 15 is formed in a fan shape, a notch 52a is provided along the inner corner of the yoke portion f in the main part, and the outer peripheral side is the edge of the outer corner. Bend at a substantially right angle along the corner at a position that coincides with (the dotted line portion shown in FIG. 15B). In addition, in the case of bending in an arc shape along the corner portion, the notch 52 is formed in the bent portion 52b to facilitate bending.
It is preferable to provide an appropriate number of c (see FIG. 15B). The corner covering cloth 52 formed as described above is provided with the bent portion 5
2b is attached to the peripheral surface of the outer corner portion of the yoke portion f with an adhesive or the like, and then the fan-shaped portion 52d is folded onto the laminated end surface of the corner portion of the yoke portion f, so that the corner cover 51 Fold it up (see FIGS. 8 and 13B). As described above, after covering one corner laminated end surface of the yoke portion f so as to be wrapped with the corner coverings 51 and 52, the other yoke portion f corner portion is similarly covered with the corner coverings 51 and 52. Wrap it in. In this way, after the corner portions of the yoke portion f are covered with the cover cloths 51 and 52, the remaining straight portions of the yoke portion f are, as shown in FIG.
In the state of being overlapped with the edge portion, the linear portion covering cloth 53 formed in a band shape is wound in a range slightly exceeding one turn to wrap and cover the entire linear portion of the yoke portion f. The corner coverings 51, 52 and the straight part covering 53 are temporarily fixed so that they can be reopened to the yoke portion f by using an adhesive tape or the like when the yoke portion f is covered as described above. To do. or,
Each of the corner coverings 51 to 53 has excellent heat resistance and flexibility, and is made of a resin having a high porosity that is well compatible with insulating oil because of its good compatibility with the yoke portion f of the winding iron core 27. Non-woven fabric, for example, the product name “Vilene” manufactured by Japan Vilene Co., Ltd. is used. However, the present invention is not limited to the above-mentioned non-woven fabric, and it is needless to say that the insulating covering portion for covering the yoke portion f of the wound iron core 27 may be formed using an insulating member made of ordinary insulating paper. is there.

Next, after the insulating coating portion 50 is temporarily fixed to the yoke portion f of the winding iron core 27, as shown in FIG.
On the inner peripheral surface side of 7, an U-shaped inner reinforcing frame 17 once removed after the annealing is arranged with its opening portion a facing the yoke portion e where the joint portion b is located, and also The outer reinforcement frame 16
Is applied to the outer peripheral surface of the wound iron core 27, and in the state where one turn is formed, the free end is superposed on the outer periphery of the yoke portion e provided with the joint portion b and temporarily fixed (see FIG. 8). As a result, the winding iron core 27
Each corner cover cloth 51 for covering the yoke portion f of
˜53 is due to the arrangement of the inner and outer reinforcing frames 16 and 17,
In the state where the laminated end surface of the yoke portion f is covered, it can be satisfactorily sandwiched between the inner and outer peripheral surfaces of the yoke portion f. In addition, winding core 2
When the core characteristics are tested with the reinforcing frames 16 and 17 arranged in advance on the inner and outer peripheral surfaces of 7, the corner coverings 51 to 53 are provided on the inner and outer peripheries of the reinforcing frames 16 and 17 and the yoke portion f. The yoke portion f may be covered by being inserted between the surface and the surface. In the above state, as shown in FIG. 9, the second forming dies 28 and 29 are arranged on the yoke portions e and f sides in the window of the rectangularly formed wound iron core 27. Mold 28, 29
A plate-shaped template plate 30 is press-fitted in between by using the concave groove 30a to prevent the wound iron core 27 from being deformed by an external force or the like. The winding core 2 is formed by the second molding dies 28, 29 and the template 30.
After the shape-retaining treatment is applied to 7, the room temperature core 27 is provided with, for example, a room temperature curable adhesive on both sides of the laminated end surface of the leg iron portion d of the winding iron core 27 in the longitudinal direction of the leg iron portion d. Then, the adhesive portion 31 is formed by applying the adhesive portion 31 at a plurality of positions at a predetermined interval.
After the adhesive portion 31 is formed, before the adhesive is cured, the adhesive portion 31 has a length dimension that overlaps with the end portion of the insulating coating portion 50 extending to the leg iron portion d side, and has a U-shaped width dimension. An adhesive similar to the above is applied to the inner parts of a pair of relatively thin insulating papers bent in a shape, and these insulating papers are shown in FIGS. 10 and 13 (A).
As shown in, on the laminated end surface of the leg iron portion d, the whole leg iron portion d is wrapped from the direction of the outer peripheral surface of the leg iron portion d,
Stick it.

In the insulating paper, the adhesive applied to the insulating paper itself and the adhesive already applied to the laminated end surface side of the leg iron portion d are well adapted to each other, and the insulating paper is immovably attached to the leg iron portion d. be able to. In this manner, the leg iron portion d of the winding iron core 27 is damaged by the laminated end surface of the leg iron portion d, and the magnetic ribbon which is brittle due to external impact or annealing by a jig or the like is missing. The insulating reinforcing portion 32 is formed to prevent the insulating reinforcing portion 32 from peeling off. In addition, in order to prevent the insulation reinforcing portion 32 from peeling off from the leg iron portion d or causing a position shift as necessary, from the outside of the insulating paper attached to the leg iron portion d,
Adhesive tape 33 with a tightening force that does not stress 7
May be wound and adhered to form the insulating reinforcing portion. Further, instead of folding the insulating paper in a U-shape, after winding it about 1 to 2 times around the leg iron portion d, the adhesive tape is wound and adhered from the outer periphery of the insulating paper as described above. You may make it form an insulation reinforcement part. Further, the adhesive portion 31 is formed on the leg iron portion d to prevent the insulation reinforcing portion 32 from moving, and therefore, it is not necessary to provide the adhesive portion 31 on the entire leg iron portion d. On the other hand, in the case of forming the insulating reinforcing portion 32, on the laminated end surface of the end portion of the insulating coating portion 50 and the winding core 27, the end portion of the insulating reinforcing portion 32 in the length direction is extended to the leg iron portion d side. In order to cause the polymerization, the temporary fixing of the insulating coating portion 50 is temporarily released, and the end portion in the length direction of the insulating reinforcing portion 32 is made to sink under the insulating coating portion 50 to form the insulating reinforcing portion 32. At this time, the end portion of the insulating coating portion 50 extending to the leg iron portion d side is dissociated by the portion of the corner portion of the yoke portion f located on the outer peripheral surface being adhered with an adhesive or the like. Since it is not possible, the end portions of the corner coverings 51, 52 forming the insulating coating portion 50 that overlap with the insulating reinforcing portion 32 are formed at the boundary (corner) between the laminated end surface of the yoke portion f and the inner and outer peripheral surfaces. By the notches 51b and 52e (see FIG. 14 and FIG. 15) provided in the part), the end part of the insulation reinforcing part 32 is overlapped with the end part of the insulating reinforcing part 32 by being slightly separated from the laminated end surface of the yoke part f. As a result, the laminated end surface of the leg iron part d and the yoke part f of the winding iron core 27 is
The insulation reinforcement portion 32 and the insulation coating portion 50 can completely cover and cover the outside. After forming the insulating reinforcing portion 32 on the leg iron portion d, the second molding fittings 28, 29 and the template 30 are removed from the wound iron core 27 (see FIG. 10).

As described above, by forming the insulating reinforcing portion 32 on the leg iron portion d of the winding iron core 27, the laminated end faces of the leg iron portion d and the yoke portion f of the winding iron core 27 are subjected to external force or the like. It can be prevented from falling off, and the inner and outer reinforcement frames 1
In combination with the existence of Nos. 6 and 17, the rigidity of the leg iron portion d itself can be enhanced. In this state,
The temporary fixing of the overlapping portion (the upper end surface of the upper yoke portion e of the wound iron core 27) of the outer reinforcing frame 16 is released again. In this case, the reinforcing frame 16
Since it is annealed at the annealing temperature of the magnetic ribbon T which is about half the annealing temperature of itself, the elastic force of the material itself remains, so that it can be easily opened and the leg iron portion d of the wound iron core 27 is
It can be expanded to a position almost on the same line. on the other hand,
The wound iron core 27 around which the magnetic ribbon T is wound releases the yoke portion e where the joint b is located at the position of the joint b. That is, as shown in FIG. 11, the wound iron core 27 is opened from the rectangular state of FIG. 10 to the position where the yoke portion e is substantially on the same line as the leg iron portion d so that the planar shape is U-shaped. In this case, the magnetic ribbon T constitutes the outer reinforcing frame 16, for example, since the plate thickness thereof is about 1/10 or less as compared with the silicon steel strip, the wound iron core 27
The outer reinforcing frame 16 can be easily expanded to the open position with almost no internal distortion.
Further, the opening work of the yoke portion e is performed by the insulating reinforcing portion 32 formed on the leg iron portion d of the winding iron core 27, the outer reinforcing frame 16 arranged on the outer peripheral surface of the winding iron core 27 and the U arranged on the inner peripheral surface. The winding iron core 27 has sufficient rigidity maintained by the character-shaped inner reinforcing frame 17, and moreover, the laminated end surfaces of the leg iron portion d and the lower yoke portion f are the insulating reinforcing portion 32 and the insulating coating portion 50. Since it is wrapped and covered in a state of being completely shielded from the outside by the, the winding iron core 27 is deformed by its own weight or deformed, or
It is possible to smoothly and satisfactorily open the yoke portion e side having the joint portion b of the wound core 27 without causing a peeling phenomenon or the like on the laminated end faces.

On the other hand, as shown in FIGS. 11 and 12, the winding 34 incorporated in the winding iron core 27 is formed in a rectangular shape within the range where one turn removed during the characteristic test of the winding iron core 27 is not formed. The innermost reinforcing frame 18 is fitted in advance inside the iron core insertion hole 35 in a state of being formed into a rectangular shape as shown in FIG. 11. In the above-mentioned state, the wound core 27 opened in a U-shape and the joint b of the opened yoke portion e are shown in FIG.
Like 1 and 12, the winding iron core 27 is fitted into the iron core inserting hole 35 of the winding 34 from the side of the yoke portion e provided with the joint b at a stroke while facing the iron core inserting hole 35 of the winding 34. In this case, in the winding iron core 27, the leg reinforcing portion d is provided with the insulating reinforcing portion 32 that prevents the magnetic ribbon T from peeling and also strengthens the rigidity, and furthermore, on the winding 34 side, in the iron core insertion hole 35. Coupled with the arrangement of the innermost reinforcing frame 18, for example, when the winding iron core 27 is pushed into the winding 34 side in FIG. The frame 16 serves as a guide, and the reinforcing frame 18 serves as the insulating reinforcing portion 32 and the outer reinforcing frame 16 serves as the iron core insertion hole 35 without the magnetic ribbon T of the winding iron core 27 coming into contact with the winding 34. The winding core 34 is slidably contacted with each other, and the winding core 34 is fitted into the winding 34 by almost one operation from the yoke portion e to the leg iron portion d to assemble it. In this way, when the winding iron core 27 is assembled, the winding iron core 2
Since the leg reinforcing portion 32 is provided with the insulation reinforcing portion 32 in Fig. 7, when the winding 34 is fitted, the winding 34 is not deformed by its own weight and the magnetic ribbon T is not peeled off. It is possible to perform the work of fitting into 34 (see FIG. 16).

As shown in FIG. 16, after the wound iron core 27 opened in the U-shape is fitted into the winding 34, between the axial end of the winding 34 and the innermost reinforcing frame 18. Figure 17
, Spacers 36 and 37 made of an insulating material (the spacer 36 is thinner than 37) are inserted, and subsequently, the yoke portion e of the open wound iron core 27 is inserted. The innermost layer portion is sequentially bent to the state before opening (inside), and the open portion pieces g are re-joined to each other as shown in FIG. 17, thereby forming the joint portion b again. that time,
That is, as shown in FIG. 17, for example, first, the opening piece g
Immediately after performing the rejoining of No. 3, between the innermost layer of the rejoined yoke portion e and the innermost reinforcing frame 18, the same as when the yoke portion f is covered with the insulating coating member 50. In addition, the tongue pieces 51a of the corner covering 51 shown in FIG. 14 are respectively sandwiched (fixed with an adhesive or an adhesive tape), and a straight line is similarly applied to a portion corresponding to the straight line portion of the yoke portion e. The part covering cloth 53 is sandwiched and inserted so as to be wound around the yoke portion e. In this case, each of the covering cloths 51 and 53 may be temporarily fixed to, for example, the outer peripheral surface side of the winding 34 so as not to interfere with the re-joining work of the remaining open piece g. As described above, after the corner covering cloth 51 and the straight portion covering cloth 53 are clamped, the remaining open piece g is rejoined, and when the joining work of the outermost periphery of the yoke portion e is completed, this The bent portion 52b of the corner covering cloth 52 is attached to the corner portion of the outermost peripheral portion of the yoke portion e with an adhesive (see FIG. 19). After rejoining the yoke portion e, the outermost periphery of the joint b is temporarily fixed with tape or the like until the free end of the outer reinforcing frame 16 is polymerized and fixed, and the joint b is dissociated. Prevent from doing.

As described above, the yoke portion e of the winding iron core 27
When the re-joining is completed, the temporary fixing of the insulating coating portion 50 temporarily fixed to the other yoke portion f is released, and the corner covering cloths 51 and 52 and the straight portion forming the insulating coating portion 50 are released. As shown in FIG. 19, the cover cloth 53 is expanded in the direction in which the folded portion is separated from the laminated end surface Z of the yoke portions e and f. And
An adhesive is applied to the corresponding positions of the laminated end surface Z and each of the covering cloths 51 to 53, and then, as shown in FIG. 13B, first, the fan-shaped portions of the corner covering cloth 51 are divided. It folds and adheres on the laminated end faces located at the corners of the yoke portions e and f. Next, the other corner cover cloth 5
The two fan-shaped portions 52d are folded and adhered onto the corner cover cloth 51. As described above, after the corner covering cloths 51 and 52 are folded and adhered to the laminated end surfaces of the corner portions of the yoke portions e and f, the free ends of the remaining linear portion covering cloths 53 are fixed to the yoke portions e and f. It is laminated and stuck on the end face of the straight part of f. In addition, since the straight portion covering cloth 53 is wound around the straight portions of the yoke portions e and f in advance for a little more than one turn, the winding portions excluding the free end side correspond to the yoke portions e and f. Since the adhesive cannot be directly applied to the laminated end surface, the covering cloth 5
The free end side of No. 3 is attached to its corresponding laminated end surface and wound around the yoke portions e and f, and then an adhesive is applied from the outside of the winding portion (cover cloth 53 portion) to wind the winding portion. The insulating covering portion 50 is formed by attaching the portions to the laminated end surfaces of the corresponding yoke portions e and f. In addition, if necessary, after attaching the corner covering cloths 51, 52 and the straight line covering cloth 53 to the yoke portions e, f, an adhesive is applied from above the covering cloths 51-53, You may make it further improve the adhesive effect of the covering cloths 51-53 and the laminated end surface of each yoke part e, f.

Further, when the corner covering cloths 51 and 52 and the straight portion covering cloth 53 are attached to the laminated end surfaces of the yoke portions e and f, the respective edge portions correspond to the edge portions of the corresponding members. It is formed in such a size that it can overlap with each other
Since the edge portions of the insulating coating portion 50 and the insulating reinforcing portion 32 formed in FIGS.
As shown in FIG. 8, by forming the insulating coating portions 50 on the respective yoke portions e and f of the wound iron core 27 as described above, the laminated end surfaces of the yoke portions e and f become the insulating coating portions 50. With this, it is possible to completely cover and to be covered while being surely shielded from the outside. Subsequently, the free end of the outer reinforcing frame 16 arranged on the outer periphery of the wound iron core 27 is superposed on the outer peripheral surface of the yoke portion e where the joint portion is located, and this portion is fixed by spot welding or the like. As shown by 20, 21, the assembling work of the winding iron core 27 to the winding wire 34 is completed. After fixing the overlapping portion of the outer reinforcing portion 16, a wedge 38 is fitted in the gap between the spacer 36 and the innermost reinforcing frame 18 to fix the winding 34 in the window of the winding core 34. Of course. When rejoining the joint b of the winding iron core 27, the leg iron d
However, the insulating reinforcing frame 32 and the inner and outer reinforcing frames 16, 17, 1
Since it is firmly fixed and held by 8, the re-joining work can be performed accurately without causing deformation or misalignment, and without causing fragments of the magnetic ribbon T to be performed quickly and reliably. In addition, since the innermost reinforcing frame 18 is interposed when the wedge 38 is fitted, the impact at the time of fitting is alleviated, and the insulating member forming the joint b and the insulating coating 50 is adversely affected by the impact. Can be avoided. In addition, the laminated end surface of the wound iron core 27 has an insulating reinforcing portion 32,
It is completely wrapped and covered by the insulating coating portion 50, and the inner and outer peripheral surfaces of the wound iron core 27 are reinforced by the reinforcing frames 16 to 1.
Since the winding iron core 27 is surrounded by 8, the magnetic ribbon T is not damaged or peeled off due to external force, vibration, or the like. In addition, even if debris is generated due to a loss of the magnetic ribbon T, the wound iron core 27
Since the outer surface of is covered with the insulating coating portion 50 and the like in a state of being completely shielded from the outside, it is possible to reliably solve the situation where debris leaks to the outside and adversely affects insulation and the like. .. Furthermore, since the insulating reinforcing portion 32 and the insulating coating portion 50 are formed so as to wrap around the leg iron portions d and the yoke portions e and f of the winding iron core 27 without applying stress to them, the magnetic ribbon It is possible to manufacture the wound iron core 27 having excellent magnetic characteristics without damaging T.

FIG. 22 shows another embodiment of the insulating coating portion 55 formed on the yoke portions e and f of the wound iron core 27.
The details will be described in 3, 24. In FIG. 24, a tongue piece of a corner covering cloth 56 covering the laminated end surface of the corner portion between the inner reinforcing frame 17 and the innermost reinforcing frame 18 inside each corner portion of the yoke portion f of the wound iron core 27 ( Corner covering 5
(The same as the one tongue piece 51a) is sandwiched to widen the portion 56a.
Is bent on the laminated end face, and in the straight portion of the yoke portion f, the straight portion having a length that can be wound around the yoke portion f between the inner reinforcing frame 17 and the innermost reinforcing frame 18 in advance. The cover cloth 57 is sandwiched and inserted. Then, the corner cover cloth 56
Also, the straight portion covering cloth 57 is formed by attaching a base portion to a predetermined position of the inner reinforcing frame 17 and forming a free end side of the yoke portion f before forming the insulating reinforcing portion 32 on the leg iron portion d of the winding iron core 27. It is mounted on the stacking end surface of and temporarily fixed. In this case, naturally, the covering cloths 56 and 57 of the yoke portion f are exposed to the outside of the stacking end surface where there is no. After doing the above,
As shown in FIG. 2, as described in the first embodiment, the insulating reinforcing portion 32 is formed on the leg iron portion d, and subsequently, the yoke portion e side having the joint portion b is opened and the winding 34 is wound. The wound iron core 27 is assembled by incorporating it into the leg iron portion d of the iron core 27 and closing the joint portion b of the yoke portion e again. At the time of reclosing the yoke portion e, as in the case of the yoke portion f, the corner covering 56 and the straight portion covering 57 are provided between the innermost reinforcing frame 18 and the innermost layer of the yoke portion e. It is sandwiched and inserted.

As described above, in the second embodiment, after the rejoining of the yoke portion e of the wound iron core 27, the covering cloth 56 already mounted on the laminated end surfaces of the laminated end surfaces of the yoke portions e and f. , 57, and after applying an adhesive, only the cover cloth 56 is attached again to the laminated end surfaces of the yoke portions e and f. After that, the adhesive is sufficiently applied from above the adhered cover cloth 56, and in this state, for example, as shown in the example of performing the yoke portion f in FIG. 24, for example, the outer peripheral surface of the yoke portion f. The yoke cover cloth 58 having the bent portion 58a temporarily fixed thereto is attached to the laminated end face so as to cover the innermost reinforcing frame 18, and then the straight line cover cloth 57 is attached to the yoke portion e, As shown in FIG. 23, it is wound from the inner side of f over the outer peripheral surface side, and its free ends are superposed and fastened on the outer peripheral surface side of the yoke portions e, f. In addition, if necessary, the yoke cover 58
Further, an adhesive is further applied from above the straight portion covering cloth 57,
These covering cloths 58, 57 may be firmly adhered to the laminated end surface of the yoke portion f so that the work of wrapping the yoke portion f can be performed reliably. In addition, the wrapping with the covering cloths 57 and 58 is similarly performed for the upper yoke portion e. And finally, the winding iron core 2
An insulating coating portion 55 is formed on the yoke portions e and f by, for example, winding and adhering an adhesive insulating paper 59 on the outer peripheral surface of 7 to cover the bent portion 58a of the yoke cover 58. Winding iron core 2
The present invention can be realized even if 7 is assembled.
Further, in the second embodiment of the present invention, instead of dividing the yoke cover cloth 58 into two and adhering them to the yoke portions e and f, one yoke cover cloth is processed into a U-shape and the yoke portion is formed. It may be attached from outside the outer reinforcing frame 16 of e and f so as to cover the upper and lower portions of the laminated end surfaces of the yoke portions e and f.

[0032]

According to the present invention, a wound iron core made of an amorphous magnetic alloy ribbon is provided with a reinforcing frame on its inner and outer peripheral surfaces, and the leg iron portion is insulated and reinforced including the reinforcing frame. On the other hand, since the yoke portion surrounds the amorphous magnetic alloy ribbon and the insulating coating portion is formed, the magnetic ribbon strips off and scatters to the outside when the wound iron core is assembled. Resolve the evil surely,
A wound iron core having excellent magnetic characteristics and insulation performance can be provided. Further, particularly in the yoke portion, the insulating coating formed between the amorphous magnetic alloy ribbon and the reinforcing frame or surrounding the amorphous magnetic alloy ribbon from the outside of the reinforcing frame has a buffer performance. Since the insulating member such as abundant non-woven fabric is used, it is possible to buffer the external force applied to the wound iron core in a buffered manner and significantly suppress the wound iron core from being damaged. Moreover, since the amorphous magnetic alloy ribbon is formed by completely enclosing the yoke portion projecting from the winding, it is possible to reliably prevent the fragments of the amorphous magnetic alloy ribbon from being released to the outside. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view showing a manufacturing process of a wound core of the present invention.

FIG. 2 is a schematic view showing a winding state of an amorphous magnetic alloy ribbon.

FIG. 3 is a plan view of a wound core element body wound in a circular shape.

FIG. 4 is an explanatory view showing a process of forming a wound core element body.

FIG. 5 is an explanatory diagram showing a state where a wound core element body is rectangularly formed and an annealing treatment is performed.

FIG. 6 is a plan view of a wound iron core that is annealed and shaped into a rectangular shape.

FIG. 7 shows an essential part of a manufacturing process of a wound core of the present invention, and is a plan view showing a state where a reinforcing frame is removed from the wound core.

FIG. 8 is an explanatory diagram showing a state in which an insulating coating portion is temporarily fixed to one yoke portion of a wound iron core.

FIG. 9 is an explanatory view showing a process of forming an insulation reinforcing portion formed on a leg iron portion of a wound iron core.

FIG. 10 is a plan view of the wound core showing a state in which an insulation reinforcing portion is formed on the leg iron portion by being connected to the insulation coating portion temporarily fixed to one of the yoke portions.

FIG. 11 is an explanatory view showing an assembling relationship between a wound iron core opened in a U shape and windings incorporated in the wound iron core.

FIG. 12 is a perspective view showing a built-in relationship between a wound iron core and windings of the same.

13A is a sectional view taken along line XX of FIG. 10, and FIG. 13B is a sectional view taken along line YY of FIG.

14A is a perspective view showing a corner covering cloth 51, and FIG. 14B is a developed view of the same.

15A is a perspective view showing a corner cover cloth 52, and FIG. 15B is a developed view of the same.

FIG. 16 is an explanatory diagram showing a state in which a winding is inserted in a wound iron core opened in a U shape.

FIG. 17 is an explanatory view showing the process of assembling the wound core.

FIG. 18 is an explanatory view showing a state in which a wound iron core is incorporated in a winding and an insulating coating member is attached to a yoke portion having a joint.

FIG. 19 is an enlarged cross-sectional view of a main part of a wound iron core showing a process of forming an insulating coating.

FIG. 20 is a plan view showing a state in which a wound iron core is incorporated in a winding.

FIG. 21 is a perspective view of a wound iron core completed according to the present invention.

FIG. 22 is a perspective view of a wound iron core showing another embodiment of the present invention.

23 is an enlarged vertical sectional view showing a main part of the wound iron core shown in FIG. 22.

FIG. 24 is an enlarged perspective view of a main part of the wound iron core shown in FIG. 22.

FIG. 24 is a perspective view showing an assembling process of a conventional wound core.

[Explanation of symbols]

 16 Inner Reinforcement Frame 17 Outer Reinforcement Frame 18 Innermost Reinforcement Frame 27 Winding Iron Core 32 Insulation Reinforcement Part 34 Winding 50 Insulation Covering Part 51 Corner Covering 52 Corner Covering 55 Insulation Covering 58 Yoke Covering b Joining d Leg Iron e Upper yoke part f Lower yoke part

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 31, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view showing a manufacturing process of a wound core of the present invention.

FIG. 2 is a schematic view showing a winding state of an amorphous magnetic alloy ribbon.

FIG. 3 is a plan view of a wound core element body wound in a circular shape.

FIG. 4 is an explanatory view showing a process of forming a wound core element body.

FIG. 5 is an explanatory diagram showing a state where a wound core element body is rectangularly formed and an annealing treatment is performed.

FIG. 6 is a plan view of a wound iron core that is annealed and shaped into a rectangular shape.

FIG. 7 shows an essential part of a manufacturing process of a wound core of the present invention, and is a plan view showing a state where a reinforcing frame is removed from the wound core.

FIG. 8 is an explanatory diagram showing a state in which an insulating coating portion is temporarily fixed to one yoke portion of a wound iron core.

FIG. 9 is an explanatory view showing a process of forming an insulation reinforcing portion formed on a leg iron portion of a wound iron core.

FIG. 10 is a plan view of the wound core showing a state in which an insulation reinforcing portion is formed on the leg iron portion by being connected to the insulation coating portion temporarily fixed to one of the yoke portions.

FIG. 11 is an explanatory view showing an assembling relationship between a wound iron core opened in a U shape and windings incorporated in the wound iron core.

FIG. 12 is a perspective view showing a built-in relationship between a wound iron core and windings of the same.

13A is a sectional view taken along line XX of FIG. 10, and FIG. 13B is a sectional view taken along line YY of FIG.

14A is a perspective view showing a corner covering cloth 51, and FIG. 14B is a developed view of the same.

15A is a perspective view showing a corner cover cloth 52, and FIG. 15B is a developed view of the same.

FIG. 16 is an explanatory diagram showing a state in which a winding is inserted in a wound iron core opened in a U shape.

FIG. 17 is an explanatory view showing the process of assembling the wound core.

FIG. 18 is an explanatory view showing a state in which a wound iron core is incorporated in a winding and an insulating coating member is attached to a yoke portion having a joint.

FIG. 19 is an enlarged cross-sectional view of a main part of a wound iron core showing a process of forming an insulating coating.

FIG. 20 is a plan view showing a state in which a wound iron core is incorporated in a winding.

FIG. 21 is a perspective view of a wound iron core completed according to the present invention.

FIG. 22 is a perspective view of a wound iron core showing another embodiment of the present invention.

23 is an enlarged vertical sectional view showing a main part of the wound iron core shown in FIG. 22.

FIG. 24 is an enlarged perspective view of a main part of the wound iron core shown in FIG. 22.

FIG. 25 is a perspective view showing an assembling process of a conventional wound iron core.

[Explanation of Codes] 16 Inner Reinforcement Frame 17 Outer Reinforcement Frame 18 Innermost Reinforcement Frame 27 Winding Core 32 Insulation Reinforcement Part 34 Winding 50 Insulation Covering Part 51 Corner Covering Cloth 52 Corner Covering Cloth 55 Insulation Covering Part 58 Yoke Covering b Bonding Part d Leg iron part e Upper yoke part f Lower yoke part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Nagata 1 Aichi-cho, Aichi-cho, Kasugai-shi, Aichi Prefecture (72) Inventor Tetsunari Ichi-ichi, Aichi-cho, Aichi-machi, Aichi-cho, Aichi

Claims (4)

[Claims] 1. An amorphous magnetic alloy ribbon is wound a predetermined number of times,
In addition, in a wound core provided with a joint such as a butt by cutting at least one portion thereof, a reinforcing frame made of a metal material having a plate thickness thicker than that of the amorphous magnetic alloy ribbon on the inner and outer peripheral surfaces of the wound core. The leg iron portion of the wound iron core provided with the reinforcing frame is formed with an insulating reinforcement portion so as to wrap it around, and the yoke portion of the wound iron core includes the insulating reinforcement portion and a part thereof. An insulating coating is formed by polymerizing the amorphous magnetic alloy ribbon of the yoke to form an insulating coating, and the winding is fitted to the leg iron of the winding core including the insulating reinforcing portion and the insulating coating. A wound iron core transformer characterized in that 2. The insulating coating part, in the yoke part of the wound iron core, encloses the amorphous magnetic alloy ribbon with an insulating member between the inner and outer reinforcing frames and the amorphous magnetic alloy ribbon. The wound-core transformer according to claim 1, wherein the wound-core transformer is arranged. 3. The insulating coating portion is arranged such that one of the insulating members is arranged on the inner reinforcing frame inside the yoke portion of the wound core, and the other insulating member is arranged on the outside of the yoke portion. 2. The wound core transformer according to claim 1, wherein the free ends facing each other are superposed on the laminated end surface of the yoke portion to enclose the amorphous magnetic alloy ribbon. 4. An amorphous magnetic alloy ribbon is wound a predetermined number of times,
Further, in a wound core of a static induction electric device having a joint such as a butt by cutting at least one portion thereof, the wound core is formed on its outer peripheral surface with a thickness larger than that of an amorphous magnetic alloy ribbon. A step of forming a rectangular shape by providing a plurality of reinforcing frames formed by increasing the plate thickness on the inner peripheral surface, and a step of magnetically annealing the rectangular formed wound iron core,
A step of temporarily removing only the innermost reinforcing frame of the wound iron core that has been magnetically annealed, and an insulating reinforcing portion and an insulating coating portion on the leg iron portion and the lower yoke portion of the wound iron core from which the innermost reinforcing frame has been removed. Forming individually and by overlapping corresponding edges, forming a U-shape by opening the yoke core side of the winding core having the joint, and forming a U-shape Incorporating the winding in a state in which the removed innermost reinforcing frame is provided on the leg iron portion of the open wound iron core, and rejoining the opened yoke portion, and further installing the winding. And a step of forming an insulating coating on the laminated end surface of the upper yoke portion of the wound core by overlapping a part of the insulating member with the insulating reinforcing portion to wrap the amorphous magnetic alloy ribbon. A method of manufacturing a wound core transformer.