JPH0225215Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a wound core transformer using a wound core formed by winding an amorphous magnetic ribbon.

[Conventional technology]

Recently, as a magnetic material to replace the conventional silicon steel strip,
BACKGROUND ART Amorphous magnetic ribbons, which have extremely low iron loss, are attracting attention, and research and development efforts are currently underway to use them in wound cores of power distribution transformers and the like. However, due to the manufacturing process, it is difficult to make the amorphous magnetic ribbon as thick as a silicon steel strip, and it is usually very thin, at around 20 to 30 μm, and is highly elastic. Therefore, there were many problems in manufacturing, for example, the wound core of a power distribution transformer using amorphous magnetic ribbon. For example, when manufacturing a one-turn cut type wound core using an amorphous magnetic ribbon,
As in the case of manufacturing a wound core using a one-turn cut method using a silicon steel strip, as shown in Fig. 1, the cut portion 1 is inserted in the wrong place each time the amorphous magnetic ribbon T is wound. The circular core 4a is formed by sequentially cutting it with a cutting device (not shown) and winding it circularly with a winding machine 3.Then, as shown in FIG. 5 and a molded plate 5a to form a rectangular core 6, and this rectangular core 6 is wound with a tightening band 7 around its outer periphery while leaving the rectangular core 5 on its inner periphery. Keep the rectangular state. In this state, the rectangular core 6 was annealed in a magnetic field in order to improve the core properties and remove processing strain caused during forming, and a one-turn cut wound core 8 as shown in FIG. 3 was manufactured.
When assembling this wound core 8 into the coil 9 shown in FIG. The wound core 8 was assembled by fitting the core into the core insertion hole 9a and joining the cut portions 1 to each other.

[Problem to be solved by the invention] However, when assembling the wound core 8 to the coil 9, the length of the wound core 8 in the vertical direction within the window and the length of the coil 9 in the axial direction are As shown in Fig. 4, the window dimensions of the core 8 are longer by the gap g, so when the wound core 8 is fitted into the coil 9 one block at a time and the cut portion 1 is joined, the coil The joint part side of the wound core assembled in 9.
When pressed downward in the figure, the amorphous magnetic ribbon constituting the wound core 8 will move as described above.
It is very thin and weak, and when it is assembled into the coil 9, the leg iron part of the core may bend in the core insertion hole 9a of the coil 9, and the remaining wound core may be bent in the core insertion hole 9a of the coil 9.
In some cases, the assembly work became difficult.

Furthermore, when assembling the wound core 8, generally two coils 9 are arranged side by side as shown in FIG. When the wound core assembled into the core insertion hole 9a swings the coil 9 in the left-right direction in FIG. The support provided by the wall of the hole 9a is temporarily removed, and the core of the coil 9 becomes loose within the core insertion hole 9a, and as described above, there is a drawback that the wound core cannot be assembled smoothly.

As described above, there are various problems in manufacturing a transformer using a one-turn cut type wound core using an amorphous magnetic band, and it is difficult to rationally manufacture a transformer using this type of wound core. It was difficult.

The present invention solves the above-mentioned drawbacks, and makes it possible to quickly and reliably assemble a wound core manufactured by a one-turn cut method using an amorphous magnetic ribbon into a coil. An object of the present invention is to provide a wound core transformer that improves the productivity of a conventional transformer.

[Means to solve the problem]

The present invention consists of cutting a highly rigid insulator such as a press board into two pieces so that it can be fitted to the innermost periphery of a wound core formed by winding an amorphous magnetic ribbon a required number of times using a one-turn cut method. in this state, the reinforcing frames are bent into a U-shape to form a pair of reinforcing frames, and the pair of reinforcing frames are arranged in an opening shape between the coil and the inner periphery of the wound core to be assembled to the coil. In this state, the cores constituting the wound core are sequentially incorporated into the coil from the outside of the reinforcing frame to manufacture a transformer having a wound core made of amorphous magnetic ribbon.

[Effect]

In this invention, when assembling the winding core to the coil, a pair of reinforcing frames made by bending a rigid insulating material such as pressboard into a U-shape are inserted into the core insertion holes of the coil. In this state, the bent ends of the reinforcing frame protruding from the core insertion hole toward the end surface in the axial direction of the coil are fixed with adhesive or the like so as not to separate from each other, and then the reinforcing frame is The core is assembled by dividing the core into blocks from the outside and sequentially inserting them into the core insertion holes of the coil and joining the cut parts to each other. When assembling, if the core is divided into blocks and inserted into the core insertion hole of the coil, the coil can be inserted along the reinforcing frame and will be supported by the reinforcing frame after insertion. To prevent the core assembled into the core from breaking and to enable smooth assembly work of the wound core, and to improve the durability and productivity of the wound core using an amorphous magnetic ribbon. In addition, since the reinforcing frame is made of a rigid insulator with a predetermined thickness, when a transformer incorporating this wound core is operated, the reinforcing frame does not contain the wound core. Similar to metals, magnetic flux flows, but unlike metals, because they are insulators, their resistance is high and eddy currents do not flow, so they have the advantage of not deteriorating the characteristics of the transformer. Since the insulator made of the reinforcing frame is inserted in advance between the coil and the coil, there is no need to add another insulator between the wound core and the coil to maintain the insulation distance between the core and the coil. , this type of wound core can be made small and lightweight.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 4 to 6.

In addition, in FIGS. 4 to 6, the same reference numerals as those shown in FIGS. 1 to 3 indicate the same parts.

The difference between the wound core transformer of the present invention and the conventional one is as shown in Figs. 4 and 5.
A pair of reinforcing frames 1 with rigidity in the gap g created between the innermost circumference of the wound core 8 and the inner surface of the coil 9
0 is inserted, and a band-shaped insulator 12 is interposed between the outer circumferential surface of the wound core 8 and the tightening band 7 that tightens the outer circumference of the wound iron core 8.

Next, the configuration of the reinforcing frame 10 will be explained. This reinforcing frame 10 is made of a rigid insulating material such as a press board or a bendable synthetic resin, and is divided into two parts so as to match the innermost circumference of the wound core 8, as shown in FIG. The reinforcing frame 10 is formed into a U-shape, and the thickness of the reinforcing frame 10 is slightly smaller than the gap g shown in FIG.

When attaching the reinforcing frame 10 to the coil 9, as shown in FIG. 4, insert a pair of reinforcing frames 10 as shown in FIG. Insert individually.
That is, the bent pieces 1 on both sides of the bridge portion 10a of the reinforcing frame 10
0b and 10b are fitted into the coil 9 so that they are located on the axial end face side, respectively, and arranged in a mouth shape as shown in FIG. 4. In this state, the pair of reinforcing frames 10,
The mutually opposing protruding ends 11a of each of the ten bent pieces 10b, 10b are irreleasably joined with adhesive or adhesive tape, thereby maintaining the pair of opening-shaped reinforcing frames 10, 10 in the opening-shaped state. Since the pair of reinforcing frames have been attached to the inner surfaces of the coils 9 as described above, the coils 9 are fitted one after another while dividing the wound core 8 into blocks, and the outer sides of the reinforcing frames 10, Assemble the wound core 8. When assembling this wound core 8, the reinforcing frames 10, 10 are formed with a plate thickness such that the outer circumferential length thereof and the circumferential length of the innermost periphery of the wound iron core 8 are approximately the same length. The wound core 8 attached to the coil 9 along the reinforcing frames 10 , 10 is fixed at each inner corner of the wound core 8 even if the upper side of the wound core 8 is pressed downward in order to join the cut portions 1 . Since the leg portions 8a of the wound core 8 are received by the corner portions of the rigid reinforcing frames 10, 10, the leg iron portions 8a of the wound core 8 are not bent within the core insertion hole 9a of the coil 9. Furthermore, even if the coil 9 swings during the assembly of the wound core 8, since the reinforcing frames 10, 10 are not integrally constructed with the coil 9, a part of the assembled wound core may already be shaped. There is no possibility of collapse,
A part of the wound core 8 assembled to the coil 9 is supported and held by the reinforcing frame 10, and does not interfere with the insertion of the core of the next block to be assembled to the coil 9. In this way, the wound core 8 is connected to the coil 9.
After assembling the wound core 8, a thin insulating material 12 such as kraft paper or resin film is wrapped one to several times around the outermost periphery of the wound core 8, and the tightening band 7 is tightened from the outside of this insulating material 11. Complete assembly of step 8.

[Effect of idea]

As explained above, in the present invention, when attaching a wound core constructed by a one-turn cut method using an amorphous magnetic ribbon to a coil, the core insertion hole of the coil corresponding to the innermost circumference of the wound iron core is inserted into the core insertion hole of the coil. A pair of rigid, U-shaped insulating reinforcing frames are arranged in a square shape from the core insertion hole to the axial end face of the coil located in the window of the wound core, and the outer side of the reinforcing frames is Since the wound core is assembled by dividing the wound core into blocks one by one and sequentially inserting them into the core insertion holes of the coil, the present invention has the following effects.

(1) The present invention has developed a wound core formed by winding an amorphous magnetic ribbon, and a gap between the innermost circumference of the wound core and the corresponding inner surface of the coil, which has excellent rigidity. A pair of insulating U-shaped insulating frames are arranged so as to fill the gap between the axial end face of the coil and the inside of the window of the wound core, so that they cannot be separated when assembling the wound core. , divide the core constituting the wound core into blocks and insert them into the core insertion hole of the coil while pressing against the reinforcing frame,
Moreover, since the core can be assembled with the inner corner part of the reinforcing frame received in the corner part of the reinforcing frame, the upper part of the core can be pressed down when assembling the core, or if the coil swings. However, since the several blocks of wound core already assembled in the coil are securely supported by the reinforcing frame so that they do not move, the leg iron parts of the core do not bend inside the core insertion hole of the coil. Since there is no possibility that the core will bend or lose its shape, it is possible to quickly assemble the wound core into the coil.
This can be done smoothly, and since a pair of reinforcing frames are used, each of which is shaped like a rectangle, it is possible to attach the reinforcing frame to the wound core in one operation. Productivity can be significantly improved.

(2) In addition, the reinforcing frame can be formed by simply forming a thick insulator with excellent rigidity into a U-shape.
It can be manufactured at low cost without special effort,
Moreover, the installation to the coil is as described above.
This can be done quickly and easily using the core insertion hole.

(3) Furthermore, since the wound core of the present invention uses only amorphous magnetic ribbon as the core material, that is,
Since only a highly rigid reinforcing frame made of an insulating material is inserted in the gap between the wound core and the coil, when a transformer using this wound core is operated, the insulating frame Similar to the wound core, a small amount of magnetic flux flows through the core. However, in the present invention, since the reinforcing frame is made of an insulating material, the resistance value is high and eddy current does not flow, so no loss occurs. Therefore, the characteristics of the amorphous magnetic ribbon can be effectively utilized without degrading the characteristics of the transformer, making it possible to provide a transformer with excellent characteristics.

(4) Also, in this invention, a pair of highly rigid and insulating reinforcing frames are inserted in a non-separable manner by utilizing the gap created between the innermost periphery of the wound core and the coil. Therefore, by inserting this reinforcing frame, it is possible to maintain the insulation distance between the wound core and the coil, and as a result, the wound core only needs to be manufactured with the window inside dimensions to the minimum necessary size. Another advantage is that this seed-wound core can be made small and lightweight.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing how an amorphous magnetic ribbon is wound onto a winding frame, Fig. 2 is an explanatory diagram showing a state in which the wound core is formed into a rectangular shape, and Fig. 3 is a front view of the rectangular wound core. 4 is an explanatory view showing the wound core transformer of the present invention being assembled, FIG. 5 is a schematic diagram of the wound core transformer of the present invention, and FIG. 6 is a perspective view of the reinforcing frame. 8... Winding core, 9... Coil, 9a... Core insertion hole, 10... Reinforcement frame.

Claims (1)

[Scope of utility model registration request] An insulator with excellent insulation properties and rigidity, such as a press board, is cut into two halves so as to fit with the innermost periphery of a wound core 8, which is made by winding an amorphous magnetic ribbon a required number of times using a one-turn cut method. , and is bent into a U-shape to form a pair of reinforcing frames 10.
0 to the gap g between the innermost peripheral part of the wound core 8 and the core insertion hole 9a and both axial ends of the coil 9, the bridge part 10a to the core insertion hole 9a, and the bridge part 10
The bent pieces 10b, 10b on both sides of a are respectively positioned on the axial end face side of the coil 9 and arranged in a square shape,
Further, the opposed protruding ends 11a, 11a of the bent pieces 10a, 10a located on the axial end face side of the coil 9 of the pair of reinforcing frames 10 are fixed to each other with adhesive or the like in a manner that cannot be separated. Characteristic wound core transformer.