JPH04326502A - Wound core transformer and its manufacture - Google Patents

Abstract

PURPOSE:To constitute a wound core transformer by covering a wound core, which is formed by rectangularly winding thin belt of amorphous magnetic alloy, with a coating cloth composed of a fiber cloth which is excellent in flexibilty and has fine mesh size. CONSTITUTION:Reinforcement frames 16-18 formed of material whose plate thickness is larger than iron core material are arranged on the inner and the outer peripheral surfaces of a wound core 27. An insulation inforcement part 32 for increasing rigidity is formed around a leg iron part (d). The whole periphery of the wound core 27 is covered with a sleeve type coating cloth 52 excellent in flexibility. Thereby fragments of an amorphous magnetic alloy thin belt T generated by the damage due to external force can be prevented from being scattered outside and is enclosed within the coating cloth 52.

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 core made of amorphous magnetic alloy ribbon, and a method for manufacturing the transformer.

0002

[Prior Art] In recent years, amorphous magnetic alloy ribbons (hereinafter simply referred to as magnetic ribbons) have been used instead of silicon steel strips as the core material for wound iron cores used in power distribution transformers, etc. Various methods are being considered. This magnetic ribbon is manufactured by ultra-quenching a molten magnetic alloy, and has excellent magnetic properties with extremely low iron loss. For example, when manufacturing a power distribution transformer using a wound core made of the magnetic ribbon, the magnetic ribbon is continuously wound to create an uncut winding having no joints. Often uses an iron core. However, the uncut type wound core is
Since the winding wire must be wound directly onto the core, the winding work is time-consuming, and in order to maintain a good proportion of the core in the insulating cylinder inside the winding, the cross section of the core has to be close to circular. The stepped structure complicates the manufacturing process for the wound core. Furthermore, since the winding wire itself was wound using a special jig, the diameter inevitably became larger.
There were problems such as not only the transformer as a whole became larger and heavier, but also the manufacturing cost increased as a result.

[0003] On the other hand, a wound core of a one-turn cut method is sometimes used, in which a magnetic ribbon cut after each turn is sequentially inserted into the winding. In this case, the wound core is, for example, a plurality of unit cores (number + pieces) made by cutting a magnetic ribbon for each turn.
This unit laminated core is further laminated in multiple layers to form a unit laminated block (hereinafter simply referred to as a laminated block). When assembling the wound core, the laminated block is The unit laminated iron cores were wound in a circle, and both ends of the unit laminated core were sequentially shifted stepwise and joined by butting or overlapping, and this laminated block was further wound and laminated in the same manner as above for the required number of layers to obtain a predetermined lamination thickness. It consisted of a one-turn cut type wound core.

[0004] The one-turn cut wound core constructed as described above is formed into a rectangular shape with the butt or other joints located on one side of the yoke, and then subjected to magnetic field annealing. After the annealing, the wound core opens the joint of the yoke for each laminated block, and as shown in FIG.
, 1b are sequentially assembled into the core insertion hole 2a of the winding 2, and the joint portions 3 of each laminated block 1a, 1b are joined again to complete the linkage between the magnetic circuit and the conductive circuit, and the wound core 4 is assembled. was going on.

[0005]

However, when manufacturing a one-turn cut type wound core using the prior art described above, there are various problems as follows.

(1) Since magnetic ribbons have poor rigidity and are extremely brittle due to annealing, when assembling the core by sequentially inserting each laminated block into the windings, If the laminated block collides with the winding, collides with a laminated block already assembled in the winding, or when the core is assembled into a transformer after the core is assembled, the core When an external force is applied to the laminated end face, outer peripheral surface, etc., the corner portions of the wound core and the laminated end face are easily damaged or peeled off, resulting in fragments. If these fragments remain in the core insertion hole of the winding after the core has been assembled, they will drift and penetrate between the layers of the winding during operation of the transformer, taking advantage of the convection generated by the temperature rise of the insulating oil. If this happens, there is a risk of causing an interlayer short circuit accident.

(2) Furthermore, since magnetic ribbons are manufactured to be extremely thin and are made brittle by annealing,
When each laminated block is assembled into a winding wire one after another, the self-supporting properties are extremely poor, and the structure often ends up in a broken state. For this reason, it was necessary to use a special jig or the like to keep the previous layer of laminated blocks inserted into the winding wire free-standing until the next layer of laminated blocks were inserted. Therefore, the efficiency of assembling the wound core is very poor, and this has been a major factor preventing improvement in the productivity of this type of seed-wound core and transformers using this wound core.

(3) Furthermore, the thickness of the magnetic ribbon is about 1/10 that of the silicon steel strip, and as mentioned above, it becomes extremely brittle due to annealing, so it is difficult to assemble the wound core. When assembling the laminated blocks by dividing them into individual blocks, as shown in Figure 16, the rectangular shape is partially broken, and the core of each laminated block is widened and expanded at the joint 3 side, and the wound core is rolled up. Since the required assembly is likely to cause internal distortion, which may have an adverse effect on the magnetic properties of the wound core, the core assembly had to be carried out with great care. In particular, although the magnetic ribbon has become brittle due to annealing, it still has some toughness, so if it peels off due to external force during assembly work, the pieces generated by the peeling will bounce back and cause damage to the worker's body. In other words, hands exposed through clothing or the face may be pierced, so work must be done with safety in mind, and there was a problem in which the assembly work of this kind of core could not be carried out smoothly and well. .

In view of the various problems mentioned above, the present invention protects the wound iron core by completely covering it with a sleeve-like fiber cloth when assembling the wound iron core, and removes the weakened magnetic thin film after annealing. It is an object of the present invention to provide a wound core transformer and a method for manufacturing the same in which peeling or damage of the magnetic ribbon is suppressed as much as possible when handling the ribbon.

0010

[Means for Solving the Problems] The present invention provides magnetic ribbons in one
A required number of reinforcing frames made of, for example, silicon steel strip, which is thicker than the magnetic thin strip, are arranged on the inner and outer peripheral surfaces of the wound core element wound by the turn-cut method, and in this state, the above-mentioned winding The core body is formed into a rectangular shape and subjected to magnetic field annealing to form a wound core. After this magnetic field annealing, the reinforcing frame located at the innermost side of the plurality of reinforcing frames arranged on the inner peripheral surface of the wound core is Temporarily remove part of the frame. Next, in order to prevent peeling and strengthen the rigidity of the laminated end face of the leg iron part, which has become brittle due to the annealing of the wound core, for example, a room temperature curing adhesive is applied partially at predetermined intervals. In this state, a thin insulating material such as insulating paper is attached so as to wrap around the entire leg iron part, and then an adhesive tape is wound and attached over the insulating material to form an insulation reinforcing part.

[0011] Next, the upper yoke part is opened in a direction colinear with the leg parts so that the planar shape becomes U-shaped using the joint provided in the upper yoke part of the wound core. Next, the U-shaped open wound core is covered with a sleeve-shaped covering made of, for example, a fiber cloth that is highly elastic and has a very fine mesh on the micron scale. Cover the entire area along the line in a tight state, and in this state, use the open yoke part to wrap the wound core,
Insert the removed reinforcing frame into the core insertion hole of the winding wire provided inside, and then move the cover cloth covering the opened yoke a little toward the leg iron part, and The yoke part,
At the joint part, the winding core is re-joined to form a rectangular shape, and the part of the covering cloth shifted toward the leg iron part is opened at the yoke part side where the covering cloth was rejoined. The ends are pulled back so that they overlap each other to completely cover the yoke. Finally, adhesive is applied from above the covering cloth onto the laminated end surfaces of the upper and lower yoke parts of the wound core, and the magnetic thin The present invention is characterized in that the transformer is configured with a wound core made of a band.

0012

[Operation] In the present invention, when incorporating a wound core made of magnetic ribbon into a winding, the rectangular wound core is opened in a U-shape, and then the entire area of the wound iron core is expanded and contracted. The wound iron core is inserted into the winding wire through a sleeve-like covering cloth made of a very fine fiber cloth with a rich mesh, so that the wound core is tightly covered by the covering cloth and is incorporated into the winding wire. Even if the magnetic thin strips that make up the wound core come off due to external force and fragments are generated, these fragments are contained within the bag-like covering that envelops the entire wound core and will never scatter to the outside. Therefore, it is possible to reliably eliminate problems such as deterioration in the insulation of the windings caused by the generation of fragments. In addition, by using the covering fabric made of a fiber cloth with a very fine mesh that has excellent elasticity, when this covering fabric is wrapped around the wound core, the shape of the wound core is changed due to its elasticity. It is now possible to closely adhere and encapsulate according to the
As a result, when assembling the core, fragments caused by the flaking phenomenon may scatter, causing a negative impact on the safety of workers, or the covering itself may shift, causing problems in assembling the core. Therefore, the assembly work of this kind of wound core can be carried out smoothly and efficiently, and the production efficiency of the wound core transformer can be significantly improved.

[0013]

Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 15. In FIG. 1, reference numeral 11 denotes a winding shaft connected to a winding machine (not shown), and a circular winding frame 12 is attached to this winding shaft 11.
The winding frame 12 is rotated, and 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 While cutting the thin ribbon T, it is wound circularly a predetermined number of times to form a wound core body 14 that is the original form of a one-turn cut type wound core. In addition, when winding the wound core body 14, the winding frame 12
A rubber belt (not shown) is wrapped around the circumferential surface of the wound core body 14 via a guide roller 15 so that the veneer of the magnetic ribbon that is cut during winding does not fall off the winding frame 12. It is being

The circular wound core body 14 wound in the above manner is attached with, for example, an adhesive tape (not shown) to its outermost periphery, and is rolled from the winding shaft 11 to the winding frame while maintaining the circular state. Remove it together with 12. Thereafter, as shown in FIG. 2, the wound core body 14 removed from the winder 12 has a silicon steel strip thicker than the magnetic ribbon T on its outer circumferential surface, for example, by a little over one turn. The outer reinforcing frame 16 is provided by winding the outer reinforcing frame 16 by temporarily fixing the overlapping portion with adhesive tape or the like. on the other hand,
After removing the winding frame 12 from the inner circumferential surface, as shown in FIG. ), and the innermost reinforcing frame is ring-shaped within a range that does not form one turn (the abutting part c at the tip).
is located on the opposite side of the opening part a of the inner reinforcing frame 17. ) 18 are respectively inserted and arranged to maintain the circular state of the wound core body 14.

Next, as shown in FIG. 3, the circular wound core body 14 is pressed simultaneously from the front, rear, left and right directions using a hydraulic press or the like via forming plates 19 and 20 to form an oval shape. transforms into Then, with the wound core body 14 pressed and held in an oval shape as shown in FIG.
The grooves 23 formed in the molds 21 and 22 are inserted so as to face each other, and in this state, a tapered mold is formed between the grooves 23 and 23, with the lower end being slightly shorter in length than the upper end. While pressing the plates 24, 24 (see FIG. 4) between the grooves 23, 23 with a press, the wound core body 14, which has been processed into an oval shape, is kept pressed by the forming plates 19, 20, and as shown in FIG. Form into a rectangular shape as shown. After forming the wound core body 14 into a rectangular shape, the forming plates 19 and 20 are fixed to each other using tightening bolts (not shown), and then framed into a rectangular shape as shown in FIG. 4 to form a formed holding frame 25. As a result, even if the pressing of the molding plates 19 and 20 is released, the wound core body 14 remains in a rectangular state due to the pressing force of the molding plate 24 press-fitted between the molding holding frame 25 and the molding dies 21 and 22. It can be held well. In addition, the outer reinforcing frame 16 has a rectangular shape with one turn, the inner reinforcing frame 17 has a U-shape, and the innermost reinforcing frame 18 has a rectangular shape without forming one turn. It is molded and held in the same way as the element body 14.

Next, as shown in FIG. 4, a heat-resistant electric wire is wound from one leg part d of the wound core body 14 to the molded holding frame 25 to form an excitation coil for magnetic field annealing. After that, the wound core body 14 is placed in an annealing furnace filled with inert gas, and the excitation coil 2 is placed in the annealing furnace filled with inert gas.
At the same time, magnetic field annealing is performed at a predetermined heating temperature while a constant current is applied to 6. After the magnetic field annealing, as shown in FIG.
By extracting the template 24 from the molding die 23 and removing it from the wound core body 14 together with the molding dies 21 and 22, the rectangular shape of the wound core body 14 is released, and a wound core 27 is formed. As described above, when magnetic field annealing is performed, the wound core 27 is sufficiently shaped to maintain its rectangular state, and the rectangular state can be maintained well due to the presence of the inner and outer reinforcing frames 16 to 18. (See Figure 5).

Next, from the rectangular wound core 27, only the innermost reinforcing frame 18, which is formed into a rectangular shape within a range that does not form one turn, is temporarily removed, and in this state, as shown in FIG. Inside the window of the formed wound core 27, second forming molds 28 and 29 are placed on the yoke parts e and f sides, and the second
A plate-shaped template 30 is inserted into a groove 30a between the molding molds 28 and 29.
This prevents the wound core 27 from losing its shape due to external force. As mentioned above, the second mold 28, 2
9 and template 30 to prevent the wound core 27 from losing its shape, as shown in FIG.
For example, the adhesive part 31 is formed by applying a cold-setting adhesive at a plurality of locations at predetermined intervals in the length direction of the leg iron part d on both sides of the laminated end face. After this adhesive part 31 is formed, and before the adhesive hardens, the inner part of a pair of relatively thin insulating paper is bent into a U-shape having the length and width of the leg iron part d. The same adhesive as above is applied to the insulating paper, and the pair of insulating papers are pasted so as to wrap the entire leg iron part d of the wound iron core 27 so as to face each other from the stacking direction of the laminated end surface of the leg iron part d.

The insulating paper is immovably stuck to the leg iron part d because the adhesive applied to the insulating paper itself and the adhesive already applied to the laminated end surface of the leg iron part d blend well together. be able to. In this way, the laminated end surface of the leg iron part d of the wound iron core 27 is damaged by the external force caused by the collision of the jig, etc.
An insulation reinforcing portion 32 is formed to prevent the magnetic ribbon T, which has become brittle due to annealing, from chipping or peeling off.

In order to prevent the insulation reinforcing portion 32 from moving or peeling off on the leg iron portion d, stress is applied to the wound iron core 27 around the outer periphery of the insulation reinforcing portion 32 attached to the leg iron portion d. The insulation reinforcing portion 32 may be formed by wrapping an adhesive tape 33 to the extent that no damage is caused. Alternatively, instead of bending the insulating paper into a U-shape, it can be wound around the leg iron part d once or twice, and then adhesive tape is wound and adhered from the outer periphery of the insulating paper as described above. The insulation reinforcing portion may also be formed by Furthermore, the reason why the adhesive part 31 is formed on the leg iron part d is to prevent the insulation reinforcing part 32 from moving, and therefore it is not necessary to provide the adhesive part 31 on the entire leg iron part d. After forming the insulation reinforcing portion 32 on the leg iron portion d, the second molding fittings 28, 29 and the template 30 are removed from the wound core 27 (see FIG. 7).

As described above, since the insulation reinforcing portion 32 is formed on the leg iron portion d of the wound core 27, the laminated end face of the leg iron portion d of the wound iron core 27 is prevented from peeling off due to external force. In addition, together with the presence of the inner and outer reinforcing frames 16 and 17, it becomes possible to strengthen the rigidity of the leg iron part d itself. After this, the temporary fixing of the overlapping part of the outer reinforcing frame 16 (the upper end surface of the upper yoke part e of the wound core 27) is released. In this case, since the reinforcing frame 16 is annealed at the annealing temperature of the magnetic ribbon T, which is approximately half the annealing temperature of the reinforcing frame 16, the elastic force of the material itself remains, so that the reinforcing frame 16 can be easily opened. It can be expanded to a position almost on the same line as the leg iron part d of. Next, the upper yoke part e, where the joint part b of the wound core 27 around which the magnetic ribbon T is wound is located, is opened at the position of the joint part b. That is, the wound core 27 is opened from the rectangular state shown in FIG. 7 to a U-shape in plan view until the yoke e reaches a position substantially on the same line as the leg part d, as shown in FIG. In this case, the magnetic thin strip T constitutes the outer reinforcing frame 16. For example, the thickness of the magnetic thin strip T is about 1/1 compared to that of the silicon steel strip.
10 or less, it is possible to easily expand the outer reinforcing frame 16 to the open position without causing almost any internal distortion in the wound core 27 itself. In addition, the above-mentioned opening work of the yoke part e is performed by removing the insulation reinforcing part 32 formed on the leg part d of the wound core 27, the reinforcing frame 16 arranged on the outer circumferential surface of the wound iron core 27, and the U-shape arranged on the inner circumferential surface. Since the rigidity of the wound core 27 itself is sufficiently maintained by the inner reinforcing frame 17 having a shape of It can be opened in a good U-shape.

Next, on the upper yoke e side of the U-shaped open wound core 27, for example, the bottom of the tip is inclined in the opposite direction, as shown by the two-dot chain line in FIG. A pair of bottomed cylindrical resin caps 50 are fitted with their bottoms facing upward until they come into contact with the insulation reinforcing portion 32 . Subsequently, an insulating tape 51 is applied to a sharp corner that forms a boundary between the laminated end face of the lower yoke part f and the inner and outer circumferential surfaces thereof to cover the edge part of the lower yoke part f. Thereafter, a sleeve-shaped covering cloth 52 shown in FIG. 9 is placed over one side of the upper yoke part e of the wound core 27 opened in the U-shape. The covering cloth 52 is
For example, women's socks (synthetic fibers) are made of highly elastic fiber cloth with very finely woven meshes of micron size, and are made of a horizontally long fiber cloth with both ends open. When fitting the covering cloth 52 into the wound core 27, one open end is expanded using the elasticity of the covering cloth 52, and the cap 50 is fitted on one side of the upper yoke e, as if wearing socks. Fit it from the outside, pass it through the insulation reinforcement part 32 of one leg part d, and turn it to one corner part of the lower yoke part f.
After covering the whole part, the insulation reinforcing part 32 provided on the other leg part d is covered and pulled up from the other side of the upper yoke part f, as shown in FIG. The entire wound core 27 opened in a U-shape is covered with a covering cloth 52.

The covering cloth 52 is made of a fiber cloth with excellent elasticity, and the U-shaped open wound core 27 covered by the covering cloth 52 is arranged on the inner and outer peripheral surfaces. Rigidity is maintained by the reinforcing frames 16 and 17 provided, and the edges are completely covered by the cap 50, the insulating reinforcing part 32, and the insulating tape 51 from above as shown in FIG. The work of covering the wound core 27 with the covering cloth 52 can be carried out smoothly and satisfactorily in approximately one operation, such as, for example, covering a bent metal member with an insulating tube. In addition, all edges of the wound core 27 are surrounded by an insulating material so as not to be exposed to the outside.
In the work of wrapping the covering cloth 52 around the wound core 27, the covering cloth 52 can be wrapped well without being torn at the edge portions. Furthermore, since the covering cloth 52 is highly elastic, it can be tightly covered with the wound core 27 after wrapping, as shown in FIG. 10, and as a result, no external force is applied to the wound core 27. Even if a part of the laminated end face peels off and fragments are generated, the fragments have a very fine mesh and are prevented from being exposed to the outside by the bag-like covering cloth 52 that tightly covers the wound core 27 itself. It becomes possible to completely confine it within the covering cloth 52 without scattering. Incidentally, after the covering cloth 52 is placed over the wound core 27 as described above, the cap 50 fitted onto the upper yoke portion e is pulled out from the open end of the covering cloth 52.

On the other hand, as shown in FIG. 10, the winding 34 fitted into the wound core 27 has one turn removed when forming the insulation reinforcing portion 32 on the leg iron portion d of the wound core 27. As shown in FIG. 10, the innermost reinforcing frame 18, which is formed into a rectangular shape to the extent possible, is fitted into the innermost part of the core insertion hole 35 in a rectangular shape. In the above state, the wound core 27 opened in a U-shape and covered with the covering cloth 52 is placed so that the joint part b of the opened yoke part e is opposed to the core insertion hole 35 of the winding 34, as shown in FIG. Then, the wound core 27 is inserted into the core insertion hole 35 of the winding 34 from the yoke part e provided with the joint part b. In this case, the wound core 27 has an insulation reinforcing part 32 formed on the leg iron part d, which serves both to prevent peeling of the magnetic ribbon T and to strengthen the rigidity. Coupled with the arrangement of the innermost reinforcing frame 18, for example, when the wound core 27 is pushed toward the winding 34 in FIG. 10 and fitted into the winding 34, the entire area of the wound core 27 The winding core 27 is covered with a covering cloth 52, and the innermost reinforcing frame 18 is fitted into the winding 34 to serve as a guide. The reinforcing frame 18 can be fitted into the winding 34 from the yoke part e to the leg part d in almost one motion while slidingly contacting the covering cloth 52 and the insulation reinforcing part 32 without contacting them. Therefore, when assembling the wound core 27, since the wound core 27 is provided with the insulation reinforcing portion 32 on the leg iron portion d, the wound core 27 is not deformed by its own weight when fitted into the winding 34, The magnetic ribbon T does not come off and can be quickly and easily fitted into the winding 34 (see FIG. 11). At this time, since the covering cloth 52 is in close contact with the wound core 27, there is no possibility that the covering will slide against the winding 34 and shift when the wound core 27 is inserted into the winding 34.

After inserting the leg iron part d of the winding core 27 into the winding wire 34 as described above, as shown in FIG. Once the winding 3
4 to one end face side, and remove the upper yoke part e as shown in Figure 1.
1, and then in the space between the axial end of the winding 34 and the innermost reinforcing frame 18,
As shown in , spacers 36 and 37 made of an insulating material (the spacer 36 is thinner than the spacer 37) are inserted. After that, as shown in FIG. 12, the whole yoke part e of the opened wound core 27 is tilted in the direction opposite to each other, and the lowered covering cloth 52 is adjusted to match the inclination of the yoke part e. Sequentially pull back the yoke part e toward the open part g side. Then, the yoke e is sequentially bent from its innermost layer to the unreleased state, and the open pieces g are rejoined to each other in order to form the joint b again. The free end of the outer reinforcing frame 16 arranged on the outer periphery of the rear-wound core 27 is overlapped with the outer circumferential surface of the yoke part e where the joint part b is located, and this part is fixed by spot welding or the like. As shown at 13, the assembly work of the wound core 27 to the winding 34 is completed. Then, when the rejoining of the joint part b is completed, the open ends of the covering cloth 52 are pulled back in the direction facing each other, and the other open end is inserted into one open end to overlap the covering cloth 52. The open ends of the cloth 52 are closed together to form the upper yoke part e.
is completely encapsulated as shown in FIG. After the wound core 27 is covered with the covering cloth 52, a wedge 38 is inserted into the gap between the spacer 36 and the innermost reinforcing frame 18, and the winding 34 is wrapped around the wound core 34.
Of course, it can be fixed within the window.

When the joint part b of the wound core 27 is rejoined, the leg part d is firmly fixed and held by the insulation reinforcing frame 32 and the inner and outer reinforcing frames 16, 17, and 18.
Accurately performs rejoining work without causing deformation or misalignment.
In addition, the wrapping with the covering cloth 52 causes almost no fragmentation of the magnetic ribbon T, and can be carried out quickly and easily. As a result, the wound core 27 can be completely wrapped in the covering cloth 52, as shown in FIG. Moreover, the covering cloth 52 is
When the wound core 27 is inserted into the winding 34, it is held in a pinched state between the inner peripheral surface of the wound core 27 and the inner peripheral surface of the wound iron core 27 by the innermost reinforcing frame 18 fitted into the winding 34 side. In addition, since the covering cloth 52 itself is in close contact with the wound core 27, there is no possibility that the covering cloth 52 will shift and cause any inconvenience to the rejoining work when the joint part b is rejoined. The work of assembling the wound core 27 to the winding 34 can be performed smoothly, quickly and reliably. Moreover, since the innermost reinforcing frame 18 is interposed when the wedge 38 is inserted,
It is possible to reduce the impact and the like at the time of fitting, and to prevent the joint part b from being adversely affected by the impact.

After assembling the wound core 27 by fitting the leg part d of the wound core 27 into the winding 34, as shown in FIG. 14, the upper and lower yoke parts e and f of the wound core 27 are laminated. An adhesive is applied to the entire end face from the outside of the covering cloth 52 to form an application surface 39, and the covering cloth 52 is adhered to the yoke parts e and f,
By pasting a covering paper 40 made of a thin insulating material on the coated surface 39, the assembly work of the wound core 27 is finally completed, as shown in FIG. As a result, the laminated end face of the wound core 27 is completely covered with the insulation reinforcing portion 32, the covering cloth 52, and the end face covering paper 40, and the inner and outer peripheral surfaces of the wound core 27 are covered with the reinforcing frames 16 to 18. Since the wound iron core 27 is surrounded by an external force, vibration, etc., the magnetic thin ribbon T will never be damaged or peeled off. In addition, even if the magnetic ribbon T is damaged and fragments are generated, the outer surface of the wound core 27 is covered with a double layer structure and shielded from the outside by the covering cloth 52 and the covering paper 40. There is no possibility that debris will leak outside and cause negative effects such as deterioration of insulation. Note that instead of providing the application surface 39 with adhesive, a covering paper made of adhesive insulating paper may be pasted onto the covering cloth 52 on the laminated end faces of the yoke parts e and f.

[0027]

[Effects of the Invention] As explained above, in the present invention, a wound core made of amorphous magnetic alloy ribbon is provided with a reinforcing frame on its inner and outer circumferential surfaces, and the leg iron portion includes the reinforcing frame. The core is covered with an insulating reinforcing part, and the entire area of the core is tightly covered with a bag-like covering made of fiber cloth with excellent elasticity, making it easy to assemble the core into a winding. At this time, it is possible to reliably eliminate the problem of the magnetic ribbon peeling off due to the impact caused when an external force is applied to the wound core. In addition, even if fragments of the magnetic ribbon were to occur due to peeling off, the entire wound core is sealed with a covering cloth that has excellent elasticity, making it possible to contain the fragments within the wound core. It is possible to prevent the problem of debris scattering outside or floating in the oil. Furthermore, the covering cloth that covers the wound core has a fine mesh, is highly elastic, and is shaped like a horizontally long sleeve.
When encasing the wound core, by effectively utilizing its elasticity, it can be passed through the wound core and encapsulated in almost one motion, making assembly of the wound core quick and easy. In addition to this, damage to the wound core can be reduced, and a wound core with excellent magnetic properties can be rationally produced.
Its productivity can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic view showing a state in which an amorphous magnetic alloy ribbon is wound.

FIG. 2 is a plan view of a wound core element body wound in a circular shape.

FIG. 3 is an explanatory diagram showing the process of forming a wound core body.

FIG. 4 is an explanatory diagram showing a state in which a wound core body is formed into a rectangle and subjected to an annealing treatment.

FIG. 5 is a plan view of a wound core that has been annealed and shaped into a rectangular shape.

FIG. 6 shows the main parts of the manufacturing method of the present invention, and this figure is an explanatory view showing the in progress of forming the insulation reinforcing part to be formed on the leg part of the wound core.

FIG. 7 is a plan view of a wound core in which an insulation reinforcing portion is formed on a leg iron portion.

FIG. 8 is a plan view showing a state in which the wound core is opened in a U-shape.

FIG. 9 is a perspective view of a covering cloth that covers the wound core.

FIG. 10 is an explanatory diagram showing a case where a winding is assembled into a wound core opened in a U-shape.

FIG. 11 is an explanatory diagram showing a state in which windings are inserted into a U-shaped open wound core.

FIG. 12 is an explanatory diagram showing the wound core in the middle of being assembled.

FIG. 13 is an explanatory diagram showing a state in which the winding is assembled into the wound core.

FIG. 14 is an explanatory diagram showing a state in which a covering paper is attached to the end face of the yoke portion of the wound core.

FIG. 15 is a perspective view showing the wound core of the present invention.

FIG. 16 is a perspective view showing a conventional wound core in the middle of being assembled.

[Explanation of symbols]

16 Inner reinforcement frame 17 Outside reinforcement frame 18 Innermost reinforcement frame 27 winding iron core 32 Insulation reinforcement part 34 Winding wire 35 Core insertion hole 39 Coated surface 40 Covered paper 52 Covering cloth T Amorphous magnetic alloy ribbon b Joint part d Leg iron part e Upper yoke part f Lower yoke part

Claims (3)

[Claims] 1. A one-turn cut type wound core in which an amorphous magnetic alloy ribbon is wound a predetermined number of times and at least one part of the wound core is cut to provide a joint such as a butt. , A reinforcing frame made of a metal material thicker than the amorphous magnetic alloy ribbon is provided on the outer circumferential surface, and an insulating insulator is placed around the leg iron part of the wound core equipped with the reinforcing frame. In addition to forming the reinforcing portion, the leg iron portion provided with the insulation reinforcing portion and the entire area of the upper and lower yoke portions connected to the leg iron portion are covered with a covering fabric made of fiber cloth formed into a sleeve shape. ,
A wound core transformer characterized in that a winding is fitted into a leg portion of the wound core covered with the insulation reinforcing portion and the covering cloth. [Claim 2] The covering cloth has a fine mesh, and
2. The wound core transformer according to claim 1, wherein the wound core transformer is formed into a sleeve shape from highly elastic fiber cloth. 3. A wound core in which an amorphous magnetic alloy ribbon is wound a predetermined number of times, and at least one part of the wound core is cut to form a joint such as a butt. A step of forming a rectangle by providing a reinforcing frame formed with a thicker plate than a magnetic alloy thin strip, and providing a plurality of reinforcing frames also formed with a thicker plate on the inner peripheral surface, A step of annealing the wound core in a magnetic field, a step of temporarily removing only the innermost reinforcing frame of the wound iron core that has been annealed in a magnetic field, and a step of adding insulation reinforcement parts to the leg iron parts of the wound iron core from which the innermost reinforcing frame has been removed. a step of opening the yoke portion of the wound core having the joint portion into a U-shape, and a step of forming a sleeve-like covering over the entire area from the leg iron portion of the wound core opened in the U-shape to the yoke portion. A process of closely covering the cloth with the cloth, and incorporating the winding wire into the leg iron part of the wound core to which the cloth is tightly adhered, with the removed innermost reinforcing frame interposed, and opening the open joint. A wound core transformation characterized by comprising the steps of retreating a part of the covering cloth and rejoining it, and further covering the rejoined yoke part with the retreated covering cloth. How to manufacture the vessel