JP6084499B2 - Amorphous winding core transformer - Google Patents

Description

  The present invention relates to an amorphous wound core transformer including a wound core made of a laminated body of amorphous magnetic alloy ribbons and a coil attached to the wound core.

  Amorphous magnetic alloys are supplied in the form of very thin ribbons. Therefore, when an iron core for a transformer is formed using a thin ribbon of amorphous magnetic alloy (hereinafter also simply referred to as a thin ribbon), it is common to take the form of a wound core. In this specification, a wound iron core configured using a thin ribbon of an amorphous magnetic alloy is referred to as an amorphous wound core, and a transformer configured by combining a coil with this wound core is referred to as an amorphous wound core transformer.

  When manufacturing an amorphous wound iron core transformer, for example, a plurality of unit laminates having a predetermined length formed by cutting a laminate of thin ribbons 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 sequentially wound around the winding frame, and both ends of the unit laminated body of each laminated body block are butt joined (butt joint) or lap joined (overlapping joined). ) To produce a rectangular wound core having a structure in which the joints are arranged stepwise on one yoke part.

  Of the portions of the rectangular wound core, the portions extending in parallel with each other and disposed in the window portions of the first and second coils are called first and second legs, and these legs are outside the coil. The part which connects between one end and between the other ends of a part is called a 1st yoke part and a 2nd yoke part. In the wound core, a joint is provided in one yoke part. In the present specification, it is assumed that a joint portion is provided in the second yoke portion.

  The amorphous wound iron core has first and second leg portions extending in parallel with each other, and first and second yoke portions that connect between one end and the other end of the first and second leg portions, respectively. After being shaped into a rectangular shape, it is annealed. Amorphous magnetic alloy becomes brittle due to annealing and is easily chipped, so that the thin ribbon that forms the wound core is missing due to external forces acting when inserting the legs of the wound core into the window of the coil. Fine fragments of the amorphous magnetic alloy may be generated, and the fragments may remain attached to the wound core. When such an amorphous wound core transformer is housed in a tank filled with insulating oil to form an oil-filled transformer, amorphous magnetic alloy fragments leak from the laminated surface of the wound core and float in the insulating oil. There are things to do. Since the amorphous magnetic alloy has conductivity, it is not preferable for the insulation of the transformer that the fragments float in the insulating oil. Therefore, in an amorphous wound iron core transformer used in the form of an oil-filled transformer, a cover that covers the wound iron core is attached, or the laminated surface of the wound iron core that is liable to generate debris is covered with a resin. This prevents the debris from leaking into the insulating oil.

  Patent Document 1 discloses an amorphous wound iron core transformer that takes measures to prevent amorphous magnetic alloy fragments from leaking into insulating oil. In the transformer shown in Patent Document 1, a U-shaped cover is attached to a U-shaped portion excluding the second yoke portion provided with the joint portion of the wound core, and the laminated surface, the inner peripheral surface, Covering the end area of the outer peripheral surface near the laminated surface and covering the laminated surface of the second yoke part not covered with the U-shaped cover with a resin coating layer, the amorphous winding core is laminated from the laminated surface. Magnetic alloy fragments are prevented from leaking.

  The U-shaped cover used in the amorphous wound core transformer disclosed in Patent Document 1 has a U-shape corresponding to each laminated surface of the U-shaped core portion of the wound iron core, and is attached to each laminated surface. U-shaped laminated surface covering portions arranged in the manner described above, and the outer peripheral surface of the U-shaped core portion of the wound iron core and the end closer to the laminated surface of the inner peripheral surface by bending from the outer peripheral edge and inner peripheral edge of the U-shaped laminated surface covered portion, respectively The outer peripheral side covering part and the inner peripheral side covering part, which are formed so as to cover the vicinity of the part and are respectively attached to the outer peripheral surface and the inner peripheral surface of the U-shaped core part without any gap by an adhesive tape. The U-shaped cover shown in Patent Document 1 also has a window portion in a part of the U-shaped laminated surface covering portion that covers the laminated surface of the first yoke portion, and each U-shaped cover window. A first filter sheet is disposed between the portion and the laminated surface of the U-shaped core portion. Furthermore, the 2nd filter sheet | seat is each arrange | positioned between the both ends of each U-shaped cover, and the laminated surface of a U-shaped iron core part. The filter sheet is provided to replace the air and oil inside the U-shaped cover when vacuum lubrication is performed.

  In addition, as shown in Patent Document 2, there is also a proposal to prevent leakage of amorphous magnetic alloy fragments from the laminated surface of the yoke portion by wrapping the yoke portion protruding from the coil of the wound core with a nonwoven fabric. Has been made.

JP-A-10-27716 JP 2011-216632 A

  In the amorphous wound core transformer shown in Patent Document 1, the outer peripheral side covering portion and the inner peripheral side covering portion of the U-shaped cover are provided over the entire peripheral edge of the U-shaped core portion, and the U-shaped In the portion along the corner portion of the iron core portion, the outer peripheral side covering portion and the inner peripheral side covering portion are formed in a shape along the curved corner portion of the U-shaped iron core portion, so that the structure and shape of the U-shaped cover become complicated. The processing cost was unavoidable.

  Further, in the amorphous wound core transformer disclosed in Patent Document 1, since the laminated surface of the second yoke portion where the joint portion of the wound core is provided is covered with the resin coating layer, the second yoke A large number of man-hours are required for the step of applying and curing the resin on the laminated surface of the part, and it is inevitable that the manufacturing cost is increased.

  As in the amorphous wound core transformer shown in Patent Document 2, if the yoke part protruding outside from the coil of the wound core is wrapped with a nonwoven fabric, the amorphous magnetic alloy fragments will leak from the laminated surface of the yoke part Can be prevented. However, in order to prevent debris generated from the laminated surface of the legs arranged in the coil of the wound core with such a structure from leaking into the insulating oil from both ends of the coil, both ends of the coil window are closed. For this reason, a troublesome operation of folding a part of the nonwoven fabric into the window portion of the coil and adhering it to the inner peripheral surface of the coil is necessary, so that it is inevitable that the assembly work efficiency of the transformer is lowered. In addition, in order to wrap the yoke part of the wound core with a nonwoven fabric, it is necessary to use a thin nonwoven fabric that is easy to bend. Therefore, in the process of inserting the legs of the wound core into the coil window, There is a risk of tearing. In the unlikely event that the nonwoven fabric is torn, it is necessary to redo the work of wrapping the yoke part of the wound core with the nonwoven fabric, which lowers the assembly efficiency of the transformer.

  The object of the present invention is to eliminate the need to use a cover having a complicated structure, to cover the laminated surface of the yoke portion provided with the joint portion of the wound core with resin, and to improve the assembly work efficiency of the transformer. An object of the present invention is to provide an amorphous wound core transformer that can prevent leakage of amorphous magnetic alloy fragments without using a member that may cause a decrease.

  The present invention comprises a laminated body of amorphous magnetic alloy ribbons, and the first and second legs extending in parallel to each other are connected to one end and the other end of the first and second legs, respectively. A first yoke part and a second yoke part, and a substantially rectangular wound core in which a joint is provided on the second yoke part, and the first and second wound cores The object is an amorphous wound core transformer including first and second coils arranged in a state of surrounding the legs.

  In the present invention, the first and second leg covering portions that are parallel to each other and cover the laminated surfaces of the first leg portion and the second leg portion of the wound iron core, respectively, and the first And a first yoke covering portion provided so as to connect one end of the second leg portion covering portion and covering a laminated surface of the first yoke portion of the wound core. A cover is provided for each of the one laminated surface and the other laminated surface of the wound core, and the first and second leg covering portions of each first cover are attached to the first and second wound cores by an adhesive tape. The first yoke covering portion is fixed to the first yoke portion of the wound core with an adhesive tape. Each of the pair of plate-like second yoke covering portions covering the one laminated surface and the other laminated surface of the second yoke portion of the wound iron core, and the pair of second yoke covering portions, respectively. A second cover having a belt-like connecting portion connecting the intermediate portions to each other, and the connecting portion of the second cover is the second yoke portion of the first and second coils. Fixed to the end of the side. And the 1st felt which contact | connects the corresponding lamination surface of the 1st yoke part of a wound iron core is affixed on the surface at the side of the wound iron core of the 1st yoke coating | coated part of each 1st cover, 2nd A second felt in contact with the corresponding laminated surface of the second yoke part of the wound core is attached to the surface of each of the pair of second yoke covering portions of the cover on the side of the wound core. Moreover, a pair of 2nd yoke covering part is being fixed to the 2nd yoke part of the wound iron core with the adhesive tape.

  The felt has a structure in which fibers are intertwined, has a cushioning property, and adapts well to the unevenness of the laminated surface when brought into contact with the laminated surface of the wound core. If the felt is kept in contact with the laminated surface of the yoke portion and the laminated surface of the second yoke portion, the amorphous magnetic alloy fragments generated from the laminated surface of the yoke portion are separated from the laminated surface. It can be prevented from leaving. For this reason, amorphous magnetic alloy fragments can leak from the laminated surface of the yoke part without using a cover with a complicated shape following the shape of the yoke part of the wound core or coating the laminated surface with resin. Can be prevented.

  In addition, as described above, the first cover is provided with the first and second leg covering portions that respectively cover the first and second leg portions of the wound core, and these leg covering portions are attached to the wound core. If it is affixed to the leg portion of the coil, it is possible to prevent the amorphous magnetic alloy fragments adhering to the laminated surface of each leg portion of the wound core located in the window portion of the coil from leaking to the outside. Therefore, according to the present invention, the leakage of amorphous magnetic alloy fragments can be prevented without using a cover having a complicated shape, and the cost of the transformer can be reduced by reducing the cost of the cover. it can. Moreover, the felt to be brought into contact with the yoke part of the wound core need only be held in contact with the laminated surface of the yoke part, and it is not necessary to wrap the wound core, so that the felt has a sufficient thickness. Things can be used. Therefore, in the process of inserting the leg portion of the wound core into the window portion of the coil, there is no possibility that the felt covering the laminated surface of the yoke portion of the wound core is damaged, and the assembly work of the transformer is delayed.

  In a preferred aspect of the present invention, the adhesive tape for fixing the first yoke covering portion of each first cover to the wound core is between the first yoke covering portion and the first yoke portion of the wound core. Only a part of the first yoke covering portion is provided to be fixed to the first yoke portion of the wound core so that the outer periphery of the first felt is exposed from the gap. Further, the adhesive tape for fixing the second yoke covering portion of the second cover to the wound core has the second felt from the gap between the second yoke covering portion and the second yoke portion of the wound core. Only a part of the second yoke covering portion is provided so as to be fixed to the second yoke portion of the wound core so as to expose the outer peripheral portion.

  As described above, the outer periphery of the first felt is exposed from the gap between the first yoke covering portion and the first yoke portion of the wound core, and the second yoke covering portion and the wound core are exposed. When the outer periphery of the second felt is exposed from the gap between the second yoke portion and the transformer is stored in the tank, the first and second oils are applied when vacuum lubrication is performed. Since the air and oil inside the cover can be replaced through the felt, vacuum lubrication can be performed without hindrance.

  In a preferred aspect of the present invention, each first cover has an inner peripheral surface side and an outer peripheral surface of the wound iron core from one end and the other end edge in the width direction of each of the first and second leg covering portions. An inner peripheral surface covering portion and an outer peripheral surface covering portion that are bent to the side and cover the vicinity of the end portions of the inner peripheral surface and outer peripheral surface near the laminated surface of the wound core, and the inner peripheral surface covering portion of each first cover; The outer peripheral surface covering portion is attached to the wound iron core with an adhesive tape provided over the entire length.

  When configured as described above, the gap between the first and second leg covering portions of the first cover and the laminated surfaces of the first and second leg portions of the wound core is reliably closed. Therefore, leakage of the amorphous magnetic alloy fragments from the laminated surface of the first and second leg portions of the wound core can be reliably prevented.

  In another preferred aspect of the present invention, the first and second end edges in the width direction of the first and second leg covering portions of the first covers are respectively the first and second ends of the wound core. It is provided so as to terminate at a position along the inner and outer peripheral edges of the leg. In this case, the first and second leg covering portions of each first cover are wound with an adhesive tape in which regions in the width direction near one end and the other end are located over the entire length. Affixed to the inner and outer peripheral surfaces of the iron core.

  Even when configured as described above, it is possible to completely close the gap between the first and second leg covering portions of the first cover and the laminated surfaces of the first and second leg portions of the wound core. Therefore, it is possible to reliably prevent the leakage of the amorphous magnetic alloy fragments from the laminated surfaces of the first and second leg portions of the wound core.

  In another aspect of the present invention, a third felt that covers the entire laminated surface of the first leg portion and the second leg portion of the wound core is further provided.

  The third felt that covers the entire laminated surfaces of the first leg portion and the second leg portion of the wound core is provided integrally with the first felt that covers the laminated surfaces of the first yoke portion. You can also

  As described above, when the entire laminated surface of the first leg portion and the second leg portion of the wound core is covered with the third felt, leakage of fragments from the laminated surface of the leg portions of the wound core is prevented. Furthermore, it can prevent reliably.

  In another aspect of the present invention, the first yoke portion and the outer periphery side of the first yoke portion of the wound iron core to which the first and second coils are attached are respectively disposed on the outer periphery side of the first yoke portion and the second yoke portion. First and second core fasteners that are opposed to the opposing direction of the second yoke portion are provided, and the first core fastener and the ends of the first and second coils on the first core fastener side. And a pair of first coil bases that press the first and second coils from one end side in the axial direction of each of the first and second laminated surfaces of the first yoke portion. The first and second coils are provided in close proximity to each other, and are disposed between the second core fastener and the ends of the first and second coils on the second core fastener side. A pair of second coil bases that hold the first coil surface from the other end side in the respective axial directions are provided on one laminated surface of the second yoke portion and the other Provided in a state of being respectively close to the layer surface. In this case, the pair of first coil bases is in contact with the pair of first covers and covers the first laminated surface of the first yoke portion of the wound core and the first yoke portion. The first felt covering the other laminated surface is provided so as to be held in contact with one laminated surface and the other laminated surface of the first yoke portion. Further, the pair of second coil bases are in contact with the pair of second yoke covering portions of the second cover so as to cover one laminated surface of the second yoke portion of the wound core, and the second felt The second felt covering the other laminated surface of the second yoke portion is provided so as to be in contact with one laminated surface and the other laminated surface of the second yoke portion, respectively. The first core fastener and the second core fastener are tightened in a direction in which they are pulled toward each other by the fastener.

  As described above, the first and second covering the respective laminated surfaces of the first yoke portion and the second yoke portion of the wound core using the coil base essential for positioning the coil of the transformer. If the felt of 2 is configured to be held in contact with the respective laminated surfaces of the first yoke portion and the second yoke portion, a special member for positioning and fixing the felt is provided. Without being provided, each felt can be held in contact with the corresponding laminated surface with certainty, and the position of the felt can be prevented from shifting due to electromagnetic vibration of the transformer, etc., and the reliability can be improved. Further, if the felt is held in contact with the respective laminated surfaces of the first yoke part and the second yoke part using the coil base, the first and second covers are formed. Even if the fixing with the adhesive tape is simplified, it is possible to prevent the positions of the cover and the felt from being shifted, so that the taping work for fixing the cover can be facilitated.

  According to the present invention, it is possible to prevent leakage of amorphous magnetic alloy fragments without using a cover having a complicated shape and without covering the laminated surface of the wound core with a resin, thereby reducing the cost of the cover. Thus, the cost of the transformer can be reduced. Also, the felt to be brought into contact with the yoke part of the wound core need only be held in contact with the laminated surface of the yoke part, and it is not necessary to wrap the wound core, so that the felt has a sufficient thickness. Can be used. Therefore, it is possible to eliminate the possibility that the felt covering the laminated surface of the yoke part of the wound core breaks in the process of assembling the transformer, causing a delay in the assembly work of the transformer.

  In particular, in the present invention, the first and second felts covering the respective laminated surfaces of the first yoke part and the second yoke part of the wound iron core are arranged by a coil base for positioning and fixing the coil of the transformer. In the case where the first yoke part and the second yoke part are configured to be kept in contact with the respective laminated surfaces, the felts are reliably brought into contact with the corresponding laminated surface. Since it can hold | maintain and it can prevent that the position of a cover shifts | deviates by the electromagnetic vibration of a transformer, etc., reliability can be improved. Further, even if the fixing of the first and second covers with the adhesive tape is simplified, it is possible to prevent the positions of these covers from being shifted, so that the covers can be easily attached.

It is the front view which showed the structure of one Embodiment of the transformer which concerns on this invention in a partial cross section. It is a side view of the transformer shown in FIG. In the transformer shown in FIG. 1, it is the perspective view which showed schematically the structure of the cover which covers the laminated surface of a wound iron core. The 1st cover used by this embodiment is shown, (A) is a front view, (B) is a top view, (C) and (D) are a left side view and a right side view, and (E) is, respectively. It is a bottom view. The 2nd cover used by this embodiment is shown, (A) is a front view, (B) is a bottom view. It is the front view which showed the state which performed the taping process to the wound iron core before covering a wound iron core with a cover. It is the front view which showed the state which attached the 1st cover to the wound iron core shown by FIG. In the process of assembling the transformer of the present embodiment, the joint portion of the second yoke portion of the wound core to which the first cover is attached is opened, and the joint portion is protected by the opened second yoke portion. It is the front view which showed the state which attached the protector for this. When assembling the transformer of this embodiment, the first and second coils attached to the first and second legs of the wound iron core are aligned and fixed by the inner frame, and the second cover is secured by the inner frame. It is front sectional drawing which showed the state fixed to the coil. FIG. 10 is a bottom view of FIG. 9. It is the front view which showed the state which inserted the wound iron core shown in FIG. 8 in the window part of the 1st and 2nd coil shown by FIG. The joint portion of the second yoke portion of the wound core shown in FIG. 11 is rejoined, the second yoke covering portion of the second cover is bent, and the second joint of the second cover is folded. It is the front view which showed the state which covered the lamination surface of the 2nd yoke part with the iron coating | coated part.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the overall configuration of the transformer 1 according to the present embodiment in a partial cross section, and FIG. 2 is a side view of the same embodiment. In these drawings, reference numeral 2 denotes a substantially rectangular amorphous wound core made of a laminated body of amorphous magnetic alloy ribbons (hereinafter also simply referred to as ribbons). The illustrated wound iron core 2 includes first and second leg portions 2a and 2b extending in parallel with each other, and first and second ends connecting the one end and the other end of the first and second leg portions 2a and 2b, respectively. It has a yoke portion 2c and a second yoke portion 2d, and a junction j is provided on the second yoke portion 2d.

  The illustrated amorphous wound core 2 is formed by laminating a plurality of unit laminated bodies L having a predetermined thickness formed by cutting and developing a thin wound body at one place, Both ends are joined by the second yoke portion 2d. In the joint portion j of each unit laminate body L, the cut end portions of the ribbons of the amorphous magnetic alloy are joined in a superposed state or joined in a butted state. The corner portions 2ca and 2cb on both sides of the first yoke portion 2c and the corner portions 2da and 2db on both sides of the second yoke portion 2d are curved so as to have an arc shape. The amorphous wound iron core shown in the drawing is formed by laminating a plurality of unit laminate bodies L having a predetermined thickness formed by cutting and developing a thin strip wound body at one place, and both ends of each unit laminate body L. Are joined by the second yoke portion 2d, and at the joint j of each unit laminate body L, the cut ends of the ribbons of the amorphous magnetic alloy are joined in a superimposed state, Or it is joined in a face-to-face state.

  The first and second coils 3A and 3B are disposed in a state of surrounding the first and second legs 2a and 2b of the amorphous wound core 2, respectively. The first coil 3A has a structure in which a low voltage coil and a high voltage coil are arranged concentrically. Similarly, the second coil 3B has a structure in which a low voltage coil and a high voltage coil are arranged concentrically. When the coils 3A and 3B are assembled to the wound core 2, the joint portion of the second yoke portion 2d of the wound core 2 is once opened, and the first and second legs 2a and 2b of the wound core 2 are respectively opened. After being inserted into the window portions of the first and second coils 3A and 3B, the respective joint portions j of the second yoke portion 2b are rejoined.

  The wound iron core 2 is annealed after being shaped into a rectangular shape, but during this annealing, the amorphous magnetic alloy ribbon becomes brittle and is easily chipped. Therefore, when opening the joint part of the second yoke part of the wound core, inserting the leg part of the wound core into the window part of the coil, or after inserting the leg part of the wound core into the window part of the coil When rejoining the joint portion of the second yoke portion 2d, fragments of the wound iron core may occur. If these fragments float in the insulating oil, it is not preferable for the insulation of the transformer. Therefore, it is necessary to take measures to prevent the fragments generated from the wound core from separating and leaking into the insulating oil as much as possible. Therefore, the laminated surface of each part of the wound core 2 is covered with the cover. FIG. 1 shows a portion (first yoke covering portion) that covers a laminated surface of the first yoke portion 2c of the wound core 2 and a laminated surface of the second yoke portion 2d in each part of the cover. A covering portion (second yoke covering portion) is shown. The detailed structure of the cover that covers the laminated surface of the wound core will be described later.

  After the coils 3A and 3B are mounted on the amorphous wound core 2, the laminated surfaces on both sides of the first yoke portion 2c of the wound core projecting outward from one axial end of the first and second coils 3A and 3B A strip-shaped first coil base 4, 4 having a sufficient thickness is disposed along the cover covering the coil 3, and these coil bases 4, 4 are brought into contact with one end in the axial direction of the coils 3 A and 3 B. The Similarly, the second coil base 4 ′, the second coil base 4 ′, and the cover covering the laminated surfaces on both sides of the second yoke portion 2d of the wound core 2 projecting outward from the other axial end of the coils 3A and 3B. 4 'is arrange | positioned and these coil stand 4', 4 'is contact | abutted by the other end of the axial direction of coil 3A and 3B.

  In the illustrated example, notched grooves 4a and 4a for passing lead wires (not shown) drawn from the coils are provided in the coil base 4 arranged on one end side in the axial direction of the coils 3A and 3B. It has been. Lead wires are not drawn from the coils, and the coil bases 4 'and 4' arranged on the other end side in the axial direction of the coils 3A and 3B (lower side in FIGS. 1 and 2) are used for passing the lead wires. Although it is not necessary to provide a notch groove, in this embodiment, in order to reduce the number of components, the same coil base 4 'as the coil base 4 (having the notch grooves 4a' and 4a ') is used. .

  As described above, after the coil bases 4 and 4 ′ are disposed at one end and the other end in the axial direction of the first and second coils 3 </ b> A and 3 </ b> B, respectively, the first yoke portion 2 c side of the wound core 2 and A first core fastener 5 and a second core fastener 6 are disposed on the second yoke portion 2d side, respectively. The first core fastener 5 and the second core fastener 6 are formed in a box shape, and are arranged in a state in which the coil bases 4 and 4 ′ are fitted inside. In the state where the core fasteners 5 and 6 are arranged in this manner, the coil bases 4 and 4 ′ in which the bottom wall portions 5 a and 6 a of the core fasteners 5 and 6 are respectively fitted inside and the first of the wound core 2. And it is contact | abutted with the outer periphery of the 2nd yoke part.

  The bottom walls 5a and 6a of the first and second core fasteners 5 and 6 have a pair of holes 5b1, 5b2 and 6b1, 6b2 spaced apart in the length direction of the yoke portion of the wound core. A band 8 inserted through the holes 6b1 and 6b2 of the second core fastener 6 and inserted into the windows of the coils 3A and 3B passes through the outer peripheral surfaces of the legs 2a and 2b of the wound core 2. Then, it is led upward through the holes 5b1 and 5b2 of the first core fastener 5. One end 8a of the band 8 led out from one hole portion 5b1 of the first core fastener 5 is formed in a bowl shape, for example, and is adjacent to the other hole 5b2 of the first core fastener 5 It is hooked and locked to the peripheral edge of the hole provided in the bottom wall portion 5a of the metal fitting 5. The portion near the other end 8b of the band 8 derived from the other window portion 5b2 of the first core fastener 5 is overlapped with the portion near the one end of the band 8 on the first core fastener 5. Arranged, the overlapping parts of the band 8 are joined by welding. The first and second core fasteners 5 and 6 are tightened in the direction in which the first and second core fasteners 5 and 6 are attracted to each other by the band 8, and the first and second coil fasteners 4 and 4 ′. Then, the coils 3A and 3B are tightened in the axial direction. Further, by this tightening, the wound iron core 2 is appropriately tightened in the axial direction of the coil.

  Referring to FIGS. 3 to 5, in the present embodiment, a structure of a cover attached to the wound core 2 in order to prevent the amorphous magnetic alloy fragments from leaking from the laminated surface of the wound core 2 is shown. In the present embodiment, as shown in FIG. 3, the first and second leg portions 2a and 2b of the wound core 2 and a first yoke portion 2c that connects one end of both the leg portions. A pair of first covers 10 and 10 that respectively cover one laminated surface and the other laminated surface of the character-shaped portion, and one laminated surface and the other laminated surface of the second yoke portion 2d of the wound core 2 are respectively covered. A second cover 11 is provided.

  FIGS. 4A to 4E show one of the pair of first covers 10, 10 that is illustrated as being separated from the wound core 2 in FIG. 3 (on the back side of the wound core 2). 1 shows the structure of one cover 10. The first cover 10 is made of thick insulating paper, and is provided in parallel with each other so as to cover the laminated surfaces of the first leg 2a and the second leg 2b of the wound core 2 respectively. The first yoke portion 2c of the wound core 2 is provided so as to connect the first and second leg covering portions 10a and 10b and one end of the first and second leg covering portions 10a and 10b. The first yoke covering portion 10c covering the laminated surface is formed so as to exhibit a U-shape as a whole.

  At the one end and the other end in the width direction of the first leg portion covering portion 10a of the first cover 10, the inner peripheral surface side of the leg portion 2a of the wound core 2 from one end and the other end edge in the width direction. Further, an inner peripheral surface covering portion 10a1 and an outer peripheral surface covering portion 10a2 are formed which are bent to the outer peripheral surface side and respectively cover the inner peripheral surface of the leg 2a of the wound core 2 and the vicinity of the end portion of the outer peripheral surface near the laminated surface. Similarly, one end and the other end in the width direction of the second leg portion covering portion 10b of the first cover 10 are connected to the inside of the leg portion 2b of the wound iron core 2 from one end and the other end edge in the width direction. An inner peripheral surface covering portion 10b1 and an outer peripheral surface covering portion 10b2 are formed which are bent toward the peripheral surface side and the outer peripheral surface side and respectively cover the inner peripheral surface of the leg portion 2b of the wound core 2 and the vicinity of the end portion of the outer peripheral surface near the laminated surface. ing. Moreover, the 1st felt 12 which contact | connects the corresponding lamination surface of the 1st yoke part 2a of the wound core 2 is affixed on the surface at the side of the wound core of the 1st yoke coating | cover part 10c of each 1st cover 10. It is attached.

  In FIG. 3, another first cover 10 illustrated in contact with the wound core 2 on the front side of the wound core 2 covers the first and second legs 2 a and 2 b of the wound core 2, respectively. The structure of the first and second leg covering portions 10a and 10b is the same as that of one of the first covers 10 shown in FIGS. . That is, the same one can be used as the pair of first covers 10 and 10.

  The first cover 10 provided for each laminated surface of the U-shaped portion of the wound core 2 has first and second leg covering portions 10a and 10b, respectively, of the wound core 2. The first and second leg portions are arranged so as to cover the laminated surface of the leg portions 2a and 2b, and the first yoke covering portion 10c covers the laminated surface of the first yoke portion 2c of the wound core 2. The covering portions 10a and 10b are fixed to the first and second leg portions 2a and 2b of the wound core with an adhesive tape, and the first yoke covering portion 10c is fixed to the first yoke portion of the wound core with an adhesive tape. It is attached to the wound core 2 by being fixed to 2c.

  The second cover 11 that covers the laminated surface of the second yoke portion 2d of the wound core 2 has the second cover 11 of the wound core 2 as shown in FIGS. A pair of plate-like second yoke covering portions 11a and 11b that respectively cover one laminated surface and the other laminated surface of the yoke portion 2d, and intermediate portions of the pair of second yoke covered portions, respectively. A band-plate-like connecting portion 11c connected to each other is integrally formed, and the surface of each of the pair of second yoke covering portions 11a and 11b on the side of the wound core is connected to the second portion of the wound core 2. The 2nd felt 13 which contact | connects the corresponding laminated surface of the 2 yoke part 2b is affixed. As will be described later, the second cover 11 is disposed in a state in which the connecting portion 11c is fixed to the end portions of the first and second coils 3A and 3B on the second yoke portion 2d side.

  In the present embodiment, the first and second coils 3A and 3B are disposed between the first core fastener 5 and the end portions of the first and second coils 3A and 3B on the first core fastener side. A pair of first coil bases 4 and 4 for pressing 3B from one end side in each axial direction are provided in a state of being close to one laminated surface and the other laminated surface of the first yoke portion 2c. Thus, the outer surfaces of the first yoke covering portions 10c and 10c of the first covers 10 and 10 in which the coil bases 4 and 4 respectively cover both the laminated surfaces of the first yoke portion 2c of the wound core 2. It is in contact with. In this way, the first yoke coating of the first covers 10, 10 is made by the coil bases 4, 4 being brought into contact with the first yoke coating portions 10 c, 10 c of the first covers 10, 10. The felts 12 and 12 attached to the parts 10c and 10c are held in contact with the corresponding laminated surface of the first yoke part 2c.

  The pair of second coil mounts 4 ′ and 4 ′ includes a second yoke covering portion 11 a provided on the second cover 11 covering both laminated surfaces of the second yoke portion 2 d of the wound core. 11a, the coil bases 4 'and 4' are in contact with the outer surfaces of the second yoke covering portions 11a and 11a, so that the second yoke covering portions 11a and 11a, The second felts 13 and 13 respectively attached to 11a are held in contact with the corresponding laminated surface of the second yoke portion 2d.

  Next, a procedure for assembling the transformer of this embodiment will be described. In inserting the first and second legs 2a and 2b of the wound core 2 into the windows of the coils 3A and 3B, respectively, in order to maintain the shape of the wound core 2, first, as shown in FIG. Adhesive tape 20 is wound around both longitudinal ends of first and second leg portions 2a and 2b of wound core 2 in a state where the joint portion of second yoke portion 2d is closed.

  Next, as shown in FIG. 7, first covers 10 and 10 that respectively cover one laminated surface and the other laminated surface of the U-shaped portion composed of the leg portions 2 a and 2 b of the wound core 2 and the yoke portion 2 c are provided. Attach to the wound core 2. Each first cover 10 has its first leg covering portion 10a and second leg covering portion 10b attached to the laminated surface of the first and second leg portions 2a and 2b of the wound core 2, respectively. After the inner peripheral surface covering portions 10a1 and 10b1 and the outer peripheral surface covering portions 10a2 and 10b2 are arranged in contact with the inner peripheral surface and the outer peripheral surface of the wound core, the first and second leg portion covering portions 10a are arranged. And 10b are attached by sticking both ends in the width direction to the wound core with the adhesive tape 21. In the present embodiment, both ends in the width direction of the first and second leg covering portions 10a and 10b are spaced from each other in the wound core by the adhesive tape 21 over the entire length in the longitudinal direction (first and first). 2 leg covering portions 10a and 10b and the laminated surface of the leg portions 2a and 2b of the wound core) without any gaps opening outside). Also, by attaching a part of the first yoke covering portion 10c of each first cover 10 to the first yoke portion 2c with the adhesive tape 22, the first yoke covering portion 10c and the wound core The first yoke covering portion 10c is fixed to the first yoke portion 2c of the wound core 2 with the outer periphery of the first felt 12 exposed from the gap with the first yoke portion 2c. Then, the first felt 12 attached to the first yoke covering portion 10c is brought into contact with the laminated surface of the first yoke portion 2c.

  After attaching the 1st covers 10 and 10 which cover the both laminated surfaces to the U-shaped part of winding iron core 2 as mentioned above, the 1st and 2nd coils 3A and 3B of winding iron core 2 in the window part of 3B are attached. The operation of inserting the first and second legs 2a and 2b is performed. In performing this operation, as shown in FIG. 8, the joint portion of the second yoke portion 2d of the wound core 2 to which the first cover 10 is attached is opened, and the joint portion is opened. The protectors 25 and 25 are attached to the left and right halves 2d1 and 2d1 of the separated second yoke portion 2d, respectively.

  The protectors 25 and 25 are case-like members that are held by the wound core 2 in a state where the left and right halves 2d1 and 2d1 of the second yoke portion 2d are received, respectively, and the legs 2a and 2b of the wound core are coiled. Each shape has been devised so as to facilitate the work of inserting into the window portion. The illustrated protectors 25 and 25 include a rectangular tubular portion 25a for receiving the left and right halves 2d1 and 2d1 of the second yoke portion 2d, respectively, and one end of the rectangular tubular portion 25a. Provided in a state of protruding from the opposite side wall portion of the other end of the rectangular tube-shaped portion 25a, the guide portion 25b whose width becomes narrower as it moves away, and frictional contact with the laminated surface of the leg portions 2a and 2b of the wound core 2 Holding part 25c. The protector 25 is held on the wound iron core 2 by frictional contact between the holding portion 25c and the leg portions 2a and 2b.

  As shown in FIGS. 9 and 10, the first and second coils 3 </ b> A and 3 </ b> B are arranged adjacent to each other with their central axes parallel to each other, and the first and second coils arranged adjacent to each other. By attaching an inner frame 27 formed by bending a stainless steel plate to adjacent portions, the first and second coils are mechanically connected. The inner frame 27 rises from both ends of the base portion 27a and a base portion 27a that is disposed facing the end faces of the coils 3A and 3B that are to be disposed on the second yoke portion 2d side of the wound core. And a pair of side wall portions 27b and 27b rising parallel to each other along the inner surfaces of adjacent portions of the coils 3A and 3B, and bent portions 27c and 27c bent at a right angle in a direction approaching each other from the tips of the side wall portions 27b and 27b. The bent portions 27c and 27c are held by the coils 3A and 3B by engaging the end surfaces of the adjacent portions of the first and second coils 3A and 3B.

  When attaching the inner frame 27 to the adjacent portions of the first and second coils 3A and 3B in order to fix the connecting portion 11c of the second cover 11 to the end portions of the first and second coils, the wound core The connecting portion 11c of the second cover 11 is brought into contact with the end surfaces of the coils 3A and 3B to be arranged on the second yoke portion 2d side. By attaching the inner frame 27 to the coils 3A and 3B in this state, the connecting portion 11c of the second cover 11 is sandwiched between the base portion 27a of the inner frame 27 and the end surfaces of the coils 3A and 3B. The two covers 11 are fixed to the end portions of the first and second coils on the second yoke portion side.

  After the second cover 11 is held by the first and second coils 3A and 3B as described above, the joint portion is opened and the legs of the wound core 2 to which the protector 25 is attached as shown in FIG. 2a and 2b are inserted into the windows of the coils 3A and 3B. At this time, the protector 25 slides on the outer surface of the inner frame 27 (not shown in FIG. 11) to guide the wound core 2, so that the wound core can be easily inserted.

  After inserting the leg portions 2a and 2b of the wound core 2 into the windows of the coils 3A and 3B, the protectors 25 and 25 are removed, and the joint portion of the second yoke portion 2d of the wound core 2 as shown in FIG. Rejoin. After that, the second yoke covering portion 11a, 11b of the second cover 11 is bent to the laminated surface side of the second yoke portion 2d of the wound core, and the second yoke covering of the second cover 11 is made. The felts 13, 13 attached to the parts 11a, 11b are brought into contact with the laminated surface of the second yoke part of the wound core. In this state, a part of the second yoke covering portion 11a, 11b of the second cover 11 is attached to the second yoke portion 2d of the wound core with the adhesive tape 23, whereby the second yoke covering portion. The second yoke covering portions 11a and 11b are wound around the core with the outer periphery of the second felt 13 and 13 exposed from the gap between the second yoke portion 2d of the wound core and 11a and 11b. The second felts 13 and 13 attached to the second yoke covering portions 11a and 11b are held in contact with the laminated surface of the second yoke portion 2d of the wound core. . In FIG. 12, the illustration of the inner frame 27 (see FIG. 9) is omitted.

  After the coils 3A and 3B are mounted on the legs 2a and 2b of the wound iron core 2 as described above, the coil bases 4 and 4 'and the core fasteners 5 and 6 are disposed, and the lead wires from the coils 3A and 3B are arranged. Is pulled out through the notch groove 4a of the coil base 4, and then the core fasteners 5 and 6 are fastened by the band 8 to complete the amorphous wound core transformer shown in FIGS.

  According to the above embodiment, it is possible to prevent leakage of amorphous magnetic alloy fragments from the wound iron core without using a cover having a complicated shape, thereby reducing the cost of the cover and reducing the cost of the transformer. Can be achieved. Further, the felts 12 and 13 to be brought into contact with the yoke part of the wound core are merely held in contact with the corresponding laminated surface of the yoke part, and it is not necessary to wrap the wound iron core. What has thickness can be used. Therefore, there is no possibility that the felt covering the laminated surface of the yoke portion of the wound core will be damaged in the process of assembling the transformer and hinder the assembly work of the transformer. Moreover, since the operation | work which wraps the yoke part of a wound iron core is not required, the amorphous wound iron core transformer which can prevent the leakage of the fragment of an amorphous magnetic alloy can be obtained without accompanying a complicated assembly operation.

  In the above-described embodiment, the first cover 10 is provided on the inner peripheral surface side of the wound iron core 2 from one end and the other end edge in the width direction of the first and second leg covering portions 10a and 10b. And inner peripheral surface covering portions 10a1 and 10b1 and outer peripheral surface covering portions 10a2 and 10b2 which are bent toward the outer peripheral surface side and cover the vicinity of the inner peripheral surface of the wound iron core and the end portion near the laminated surface of the outer peripheral surface, respectively. The covering portions 10a1 and 10b1 and the outer peripheral surface covering portions 10a2 and 10b2 are adhered to the wound iron core without any gaps by the adhesive tape provided over the entire length, but the adhesive tape is not necessarily the inner peripheral surface covering portions 10a1 and 10b1. And it is not necessary to provide over the full length of outer peripheral surface coating | coated part 10a2, 10b2. Further, without providing the inner peripheral surface covering portions 10a1, 10b1 and the outer peripheral surface covering portions 10a2, 10b2, one end in the width direction of each of the first and second leg portion covering portions 10a, 10b of each first cover 10 and The end edges of the other ends are terminated at positions along the inner and outer peripheral edges of the first and second leg portions 2a and 2b of the wound core 2, respectively. The leg portions 2a of the wound core 2 are covered with an adhesive tape (preferably an adhesive tape provided over the entire length) of one end and the other end in the width direction of the leg covering portions 10a and 10b. And 2b may be attached without any gap. In short, between the first and second leg covering portions of the first cover 10 and the inner and outer peripheral edges (edges at both ends in the width direction) of the legs 2a and 2b of the wound core, The first leg covering portion 10a and the second leg covering portion 10b are attached to the first and second leg portions 2a and 2b of the wound iron core with an adhesive tape in a state where no gap is formed in the opening. do it.

  In the above embodiment, the laminated surfaces of the first leg 2a and the second leg 2b of the wound core 2 are not covered with felt, but the first leg 2a and the second leg of the wound core are not covered. You may make it provide the 3rd felt which coat | covers the whole each laminated surface of the part 2b. In this case, it is preferable that the third felt is provided integrally with the first felt 12 that covers each laminated surface of the first yoke portion 2c of the wound iron core.

  As described above, if the entire laminated surfaces of the first leg 2a and the second leg 2b of the wound core 2 are covered with the third felt, fragments from the laminated surface of the legs of the wound core 2 Can be more reliably prevented.

  As the felt, it is preferable to use a felt that is flexible enough to conform to the unevenness of the laminated surface of the wound core and that has a sufficient thickness so as not to be damaged in the process of assembling the transformer. There are two types of felts: one processed wool and one processed non-woven fabric (nonwoven fabric). In practicing the present invention, any felt can be used as long as the above conditions are satisfied. Also good.

  In addition, when providing the 1st felt which covers the lamination surface of the 1st yoke part of the wound iron core 2, and the 3rd felt which covers the lamination surface of the 1st and 2nd leg part integrally, these felts are provided. Thereby, the U-shaped cover which covers the whole lamination surface of a U-shaped part except the yoke part in which the junction part of the wound iron core was provided is comprised. When the U-shaped cover is formed of felt in this way, the first cover made of insulating paper is omitted, and the U-shaped cover itself made of felt is fixed to the wound iron core, so that the U-shaped portion of the wound iron core is fixed. It is also possible to take a configuration that prevents fragments from leaking from the laminated surface.

DESCRIPTION OF SYMBOLS 1 Amorphous volume iron core transformer 2 Winding core 2a 1st leg 2b 2nd leg 2c 1st yoke part 2d 2nd yoke part 3A 1st coil 3B 2nd coil 4, 4 'coil Base 5 First core fastener 6 Second core fastener 8 Band (fastener)
DESCRIPTION OF SYMBOLS 10 1st cover 10a 1st leg part covering part 10a1 Inner peripheral surface covering part 10a2 Outer peripheral surface covering part 10b Second leg part covering part 10b1 Inner peripheral surface covering part 10b2 Outer peripheral surface covering part 10c First yoke covering Part 11 Second cover 11a, 11b Second yoke covering part 11c Connecting part 12 First felt 13 Second felt 25 Protector 27 Inner frame

Claims (7)

The first and second legs extending in parallel to each other, and the first and second legs are connected to each other between the first end and the other end of the first and second legs. A substantially rectangular wound iron core having a yoke part and a second yoke part, and having a joint provided on the second yoke part, and first and second leg parts of the wound iron core In an amorphous wound core transformer comprising first and second coils arranged in a state of surrounding each of
Strip-shaped first and second leg covering portions provided in parallel to each other and covering the laminated surfaces of the first leg portion and the second leg portion of the wound iron core, respectively, and the first and second leg portions A U-shaped first cover having a first yoke covering portion provided so as to connect one end of the leg portion covering portion and covering a laminated surface of the first yoke portion of the wound core; The first and second leg covering portions of each of the first covers are provided on each of the one laminated surface and the other laminated surface of the wound core, and the first and second legs of the wound core are bonded with adhesive tape. And the first yoke covering portion is fixed to the first yoke portion of the wound iron core with an adhesive tape,
Each of the pair of plate-like second yoke covering portions respectively covering one laminated surface and the other laminated surface of the second yoke portion of the wound iron core, and each of the pair of second yoke covering portions A second cover having a strip-shaped connecting portion connecting the intermediate portions to each other, and the connecting portion of the second cover is connected to the second joint of the first and second coils. Fixed to the end on the iron side,
A first felt contacting the corresponding laminated surface of the first yoke portion of the wound core is attached to the surface of the first yoke covering portion of each first cover on the side of the wound core;
A second felt that is in contact with a corresponding laminated surface of the second yoke portion of the wound core is attached to each of the wound core side surfaces of the pair of second yoke covering portions of the second cover;
The pair of second yoke covering portions are fixed to the second yoke portion of the wound core by an adhesive tape;
Amorphous wound iron core transformer. The adhesive tape for fixing the first yoke covering portion of each first cover to the wound core is the first tape from the gap between the first yoke covering portion and the first yoke portion of the wound core. So that only a part of the first yoke covering portion is fixed to the first yoke portion of the wound core so as to expose the outer peripheral portion of the felt,
The adhesive tape for fixing the second yoke covering portion of the second cover to the wound core is the second tape from the gap between the second yoke covering portion and the second yoke portion of the wound core. A part of the second yoke covering portion is provided so as to be fixed to the second yoke portion of the wound core so that the outer periphery of the felt is exposed. The amorphous wound core transformer according to 1. Each of the first covers is bent toward the inner peripheral surface side and the outer peripheral surface side of the wound core from one end and the other end edge in the width direction of each of the first and second leg cover portions. An inner peripheral surface covering portion and an outer peripheral surface covering portion that respectively cover the vicinity of the end portions of the inner peripheral surface and outer peripheral surface of the iron core near the laminated surface
The inner peripheral surface covering portion and the outer peripheral surface covering portion of each first cover are attached to the wound iron core by an adhesive tape provided over the entire length of each of the first covers. Amorphous winding core transformer. The first and second leg covering portions of each first cover have one end in the width direction and the other end edge at the inner and outer edges of the first and second legs of the wound core, respectively. Provided to terminate at a position along the periphery,
Each of the first and second leg covering portions of each first cover has an area near one end in the width direction and a region near the end edge of the other end of the first core by an adhesive tape provided over the entire length of each of the wound cores. Affixed to the inner and outer peripheral surfaces of the first and second legs,
The amorphous wound core transformer according to claim 1 or 2, wherein   The amorphous wound core transformer according to claim 1, further comprising a third felt that covers the entire laminated surface of the first leg portion and the second leg portion of the wound core.   The third felt covering the entire laminated surface of the first leg portion and the second leg portion of the wound iron core is integrated with the first felt covering the laminated surface of the first yoke portion. The amorphous wound core transformer according to claim 5, which is provided. The first yoke part and the second yoke part on the outer periphery side of the first yoke part and the outer periphery side of the second yoke part of the wound core to which the first and second coils are attached, respectively. First and second core fasteners facing each other in the opposite direction are provided,
The first and second coils are arranged between the first core fastener and the end portions of the first and second coils on the first core fastener side, and the first and second coils are respectively connected to one end side in the axial direction. A pair of first coil bases that are pressed from each other are provided in proximity to each of the one laminated surface and the other laminated surface of the first yoke portion, and the second core fastener and the first A pair of second coil bases disposed between the end portions of the first and second coils on the second core fastener side and pressing the first and second coils from the other end side in the axial direction. Are provided in a state of being close to the one laminated surface and the other laminated surface of the second yoke part,
The pair of first coil mounts is in contact with the pair of first covers and covers the first laminated surface of the first yoke portion of the wound core and the first yoke portion. The first felt covering the other laminated surface is provided so as to be in contact with one laminated surface and the other laminated surface of the first yoke portion, respectively.
The pair of second coil mounts are in contact with the pair of second yoke covering portions of the second cover and cover one laminated surface of the second yoke portion of the wound core. And the second felt covering the other laminated surface of the second yoke part is provided so as to be in contact with one laminated surface and the other laminated surface of the second yoke part, respectively.
The first core fastener and the second core fastener are tightened in a direction in which the first core fastener and the second core fastener are pulled toward each other;
The amorphous wound core transformer according to any one of claims 1 to 6.

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