JP4397353B2 - Amorphous transformer - Google Patents

Description

  The present invention relates to an amorphous transformer and an insulating paper manufacturing machine, and more particularly, to an end surface treatment of a wound iron core made of a laminate of amorphous magnetic alloy steel ribbons, and an amorphous transformer manufactured thereby.

  Amorphous magnetic alloys are supplied in the form of ribbons that are extremely thin (for example, nominal plate thickness 0.025 mm). Therefore, when an amorphous magnetic alloy is used to form an iron core for a transformer, it takes the form of a wound iron core. Is normal.

  When manufacturing an amorphous transformer, for example, a plurality of unit laminates having a predetermined length and a predetermined number of unit laminates formed by cutting a laminate of thin strips are stacked while shifting the position in the longitudinal direction by a predetermined shift dimension. The laminated body is made into one laminated body block, a plurality of laminated body blocks are stacked horizontally, and wound around a core bar as an inner frame, and both ends of the unit laminated body of each laminated body block are butt joined (butt joined) or By carrying out lap joining (overlap joining), a rectangular wound iron core having a structure in which the joining portions are arranged stepwise on one yoke portion is manufactured.

  An example of a rectangular wound iron core is shown in FIG. Conventionally, a rectangular wound iron core manufactured as described above is carried into an annealing furnace and annealed for distortion removal.

  However, since the amorphous magnetic alloy becomes brittle by annealing, as shown in FIG. 5, when the work of fitting the iron core into the winding is performed, the iron core is chipped and large and small fragments are generated from the laminated surface. If this debris comes off the iron core and adheres to the winding or mixes with the insulating oil in the transformer case, the insulation performance of the transformer will deteriorate, and in the worst case, the transformer may burn out. There is. Therefore, in this type of transformer, it is necessary to take measures to contain the fragments so that the amorphous magnetic alloy fragments do not separate from the iron core.

  In the conventional method, the rectangular wound iron core is fixed by the adhesive tape 4 or the like so as to wrap the wound iron core with paper 3 or the like by hand as shown in FIG. Further, as shown in FIG. 3, the fragments are prevented from being scattered by wrapping them manually in a bandage with paper or the like and stopping the ends with adhesive tape. This work required many man-hours, paper, and tape due to the various iron core dimensions.

The rectangular wound iron core manufactured as described above once opens the joint as shown in FIG. Next, the iron core 2 is inserted into the coils 5A and 5B and reassembled in the direction of the arrow 6 to complete the contents of the amorphous transformer as shown in FIG. This is a finished product as a transformer (not shown) with a tank, insulating oil, and a lid.
JP-A-10-27716 JP-A-11-135349

  As described in Patent Document 1, the conventional measures to prevent debris of amorphous wound core are to apply an adhesive to the end of the wound core in advance and attach a U-shaped cover to prevent the insulating oil from passing through and prevent debris drifting. In order to improve, we spent a lot of material costs and man-hours such as attaching filters. Further, Patent Document 2 also attempts to prevent debris by applying an adhesive to the end of the wound iron core in advance and attaching a sponge to the wound iron core or the paper side. As another method, a paper having good oil permeability is used, and the whole is manually wrapped with a wrapping paper according to the model as shown in FIGS. 2 and 3, and fixed with tape. For this reason, a lot of man-hours are required, and since the cover becomes the whole, a lot of material costs (paper, adhesive tape, etc.) are required, and there are also many types of covers, which makes it difficult to find and manage is there.

  In the present invention, when the end portion of the wound core after annealing is wrapped with paper or the like, the wrapped paper and the fixing tape can be supplied as one body, and the thickness of the wound core (W1 in FIG. 15). The aim is to provide an amorphous transformer and an insulating paper making machine that have been creased in advance and minimized the folding length, and the supply width is standardized to facilitate management.

Amorphous transformer of the present invention, in order to achieve the above object, consists stack of conductors of the amorphous magnetic alloy steel, having a yoke portion and a leg portion, substantially bonded portion is provided on the yoke portion In an amorphous transformer comprising a rectangular wound iron core and a winding fitted to at least one leg of the wound iron core, the wound iron core is made of a laminate, and the insulating paper that holds down the wound iron core is: It has a predetermined width, is bent in a U-shape with folds that are substantially matched to the width of the side surface of the laminate, and has an end portion at both ends perpendicular to the fold direction. The wound iron core has an adhesive tape that protrudes, and presses both sides of the side surface of the laminated body in a U-shape by a plurality of sheets of the insulating paper so as to partially overlap the adjacent insulating paper That the end of the cover was covered without gaps And butterflies.

  According to the present invention, the debris generated on the end surface of the amorphous wound core can be pressed with the wrapping paper and the adhesive tape on the end surface with the width of the wound core and the minimum dimension of the U-shape. Use less. In addition, since paper is used, the end surface can be pressed with a small part of the folded surface and the end surface without using adhesive or resin, and the end surface is not constrained and the characteristics are not deteriorated, and fragments can be prevented. .

The best mode for carrying out the present invention will be described.
Embodiments of an amorphous transformer and an insulating paper manufacturing machine according to the present invention will be described with reference to the drawings.

  Examples will be described. This embodiment will be described with reference to the drawings. FIG. 15 shows an end face of a wound core with a width W1 using an insulating paper according to the present embodiment, with the end face of a substantially rectangular wound core 1 attached to a U-shape with an insulating paper 3 having a width W3 and a bending dimension H. This is an example in which the front and back surfaces are fixed with an adhesive tape 4. Also. FIG. 16 is a bird's-eye view when the joint part of the wound iron core of FIG. 15 is opened to be U-shaped.

  First, an insulating paper manufacturing machine according to an embodiment will be described. FIG. 7 is a schematic view thereof, and FIG. 8 is a bird's eye view. The wound body of the tape-like insulating paper 3 and the wound body of the adhesive tape 4 are arranged in each of them, sandwiched by the feed rollers 8a and 8b, and conveyed while superposing the insulating paper 3 and the adhesive tape 4 by the feed motor 7. A cutter 10 cuts the insulating paper 3 and the adhesive tape 4 and is moved up and down by a cylinder 13. The molds 11a and 11b have a position (interval) L2 by the motor 9 via the left and right screws 14a and 14b, and are mechanisms for making a crease in the setup cylinders 12a and 12b. The operation will be described below. First, as shown in FIG. 9, the dimension L2 is set up to match the end face thickness dimension W1 of the wound core. Further, the bending dimension H from the crease is also set up. As the operation, as shown in FIG. 10, the insulating paper 3 and the adhesive tape 4 are superposed and fed to a position where the predetermined dimension L2 and dimension H are obtained by the feed motor 7.

  Next, as shown in FIG. 11, the molds 11 a and 11 b are closed by the cylinders 12 a and 12 b to make a crease, the crease is made simultaneously on the insulating paper 3 and the adhesive tape 4, and the cutter 10 is further cut by the cylinder 13. . Then, as shown in FIG. 12, each part is released and the creased insulating paper 3 'is taken out. The obtained insulating paper 3 is shown in FIGS. 13 (a) and 13 (b), and the bent shape is shown in FIGS. 14 (a) and 14 (b). Next, as shown in FIGS. 15 (a) and 15 (b), the end of the wound iron core is bent into a U shape, and the insulating paper 3 with the adhesive tape 4 is attached. At this time, if the width W3 of the wrapping paper 3 is kept constant, the end of the wound core can be covered without any gap by adjusting the number of sheets to be pasted according to the length in the longitudinal direction of the wound core. . As another option, by preparing several types of insulating paper 3 having different widths W3, it is possible to reduce the number of times of pasting, and it is also possible to increase the width W3 of the insulating paper 3 so that only one time is required. Is possible. FIG. 16 shows an amorphous wound iron core manufactured by using the insulating paper manufactured by the insulating paper manufacturing machine of this embodiment, but the object can be achieved by other products regardless of the transformer.

  As described above in the embodiments, the present invention covers the end surface of the wound core with a wrapping paper with a crease and an adhesive tape in order to prevent the wound core from becoming fragile due to annealing and floating fragments in the wound core of the amorphous transformer. Thus, an amorphous transformer having a function of preventing the floating can be obtained easily and inexpensively.

  That is, in the present invention, the width W2 of the insulating paper that wraps the wound iron core as shown in FIG. 13 is determined in several kinds, so that the trouble of management and searching is saved, and the end face width of the wound iron core as shown in FIG. In accordance with the dimension L2 of the (winding thickness), crease is measured in advance, the dimension is measured one by one, and the adhesive tape 4 is preliminarily attached to the wound iron core so that it can be easily attached without being bent manually. From the width W3 dimension of the insulating paper 3, the paper that wraps the wound iron core is automatically taken out each time so that the end portion of the tape 4 comes out about half or more. If the paper width W3 of the roll-shaped insulating paper 3 and the adhesive tape 4 are simultaneously sandwiched by the rollers 8a and 8b and are fed by a predetermined amount by the feed motor 7, the insulating wrapping paper is automatically ejected, thereby greatly reducing the packaging time. Can do.

  Further, the wrapping paper produced as described above is folded and bent into a U shape as shown in FIG. 14, and the paper and adhesive tape can be greatly reduced by reducing the H dimension as much as possible. Also, by fitting the crease to the wound core dimensions, the operator's dimension measurement can be greatly reduced.

Explanatory drawing of an amorphous wound iron core. Explanatory drawing of the amorphous wound iron core wrapped with the conventional paper. Explanatory drawing of the method of wrapping the conventional amorphous winding core with paper. Explanatory drawing before the assembly of the amorphous wound iron core wrapped with the conventional paper. Explanatory drawing of the assembly of the conventional amorphous winding core and winding. Explanatory drawing after the assembly of the conventional amorphous winding core and winding. Explanatory drawing of the insulating paper manufacturing machine of an Example. The principal part expansion explanatory drawing of the insulating paper manufacturing machine of an Example. Explanatory drawing of the manufacturing process 1 of the insulating paper in an Example. Explanatory drawing of the manufacturing process 2 of the insulating paper in an Example. Explanatory drawing of the manufacturing process 3 of the insulating paper in an Example. Explanatory drawing of the manufacturing process 4 of the insulating paper in an Example. Explanatory drawing of the insulating paper in an Example. Explanatory drawing of the fold of the insulating paper in an Example. Explanatory drawing of the amorphous wound iron core in an Example. The bird's-eye view of the amorphous wound iron core in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Amorphous winding core 2 Iron core 3 Insulation paper 4 Adhesive tape 7 Feed motor 8 Roller 9 Motor 10 Cutter 11 Screw 12, 13 Cylinder

Claims (1)

It consists stack of conductors of the amorphous magnetic alloy steel, having a yoke portion and a leg portion, a generally rectangular wound iron core joint portion is provided on the yoke section, at least one leg of the winding core In an amorphous transformer with windings fitted in
The wound iron core is made of a laminate,
The insulating paper that holds down the wound iron core has a predetermined width, is bent in a U-shape with folds that are substantially aligned with the width of the side surface of the laminate, and is orthogonal to the crease direction. Have both ends of the adhesive tape with part of the end protruding
By pressing the both sides of the side surface of the laminate in a U-shape with a plurality of sheets of the insulating paper so as to partially overlap the adjacent insulating paper, the end of the wound core is covered without any gaps. amorphous transformer, characterized in that the.

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