JP2921683B2 - Wound iron core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wound core made of an amorphous magnetic alloy ribbon.

[Prior Art] Recently, amorphous magnetic alloys have attracted attention as low-loss iron core materials, and transformers for power distribution are manufactured using amorphous magnetic alloy ribbons (hereinafter, also simply referred to as ribbons). It is considered to be.

Conventionally, the core of the distribution transformer is made of silicon steel plate. In this case, a one-turn cut rectangular iron core is often used. For a one-turn cut wound core, 1
A laminate of silicon steel strips cut so as to have a length slightly longer than the turn is shaped into a rectangular shape, and both ends of the laminate are overlapped in a step-like manner to form a laminate block. A plurality of body blocks are further laminated to form an iron core.

In manufacturing this one-turn cut iron core, for example, a silicon steel strip is cut to a length slightly longer than one turn, and the cut silicon steel sheets are sequentially wound by shifting the position of the joint. Form a circular wound core. Next, the circular core is shaped to form a rectangular core, and the rectangular core is annealed. Thereafter, the overlapped joint of the wound core is once opened, the wound core is fitted, the winding is fitted, and then the overlapped joint is closed to assemble the transformer.

In the case where a wound core is formed from an amorphous magnetic alloy ribbon, the same method as described above has been studied. However, since the amorphous magnetic alloy ribbon has a thickness of only about 25 μ, it is very troublesome to handle and the working efficiency is extremely poor.

Therefore, a method has been proposed in which a plurality of thin ribbons (several dozens to several tens) are combined to form a unit laminate, and a plurality of the unit laminates are used to form a wound core. In this method, a laminate block formed by laminating a plurality of unit laminates is wound, and both ends of the unit laminate are staggered and overlapped and joined, and a plurality of the laminate blocks are further laminated. An iron core having a predetermined thickness is formed.

The iron core laminated to a predetermined thickness is shaped into a rectangular shape with the overlapped joint positioned on one side of the yoke, and then magnetically annealed. Due to this magnetic field annealing, the magnetic properties that have been lowered due to the strain applied in the iron core manufacturing process are recovered. Thereafter, the overlapping joint of the iron core is once opened, the winding is fitted to the leg of the iron core, and the overlapping joint of the iron core is closed again. This completes the linkage connection between the magnetic circuit and the conductive circuit, and the stationary induction electric device has its basic functions (voltage conversion, induction reactance element, etc.).

The work efficiency is improved by treating the unit laminate as if it were a single magnetic steel sheet as a unit laminate having an appropriate thickness by gathering the ribbons as described above, but the unit laminate simply consists of the ribbon. The mechanical properties of the ribbon are not particularly changed by forming a unit laminate because they are merely layers. Therefore, low rigidity due to the extremely thin ribbon and difficulty in handling due to the extremely brittle ribbon after magnetic field annealing still exist. Therefore, extremely careful handling of the iron core after annealing is required. Further, a frame is attached to the inner peripheral surface of the core to reinforce the core, or the core is covered with a protective cover to protect the core.

[Problems to be Solved by the Invention] In a completed state of a stationary induction electric device using an iron core having thin ribbons stacked thereon, various reinforcing materials and protective covers are attached to the iron core to protect the core against external force. The belt is not easily damaged.

However, the ribbon is often damaged during the manufacturing process of the iron core and the manufacturing process of the stationary induction electric equipment in which the windings are fitted to the iron core. There is a problem that it frequently occurs in thin ribbons.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wound core in which the inner peripheral portion of the iron core is mainly protected to reduce the risk of damage to the ribbon when handling a weakened ribbon after annealing.

[Means for Solving the Problems] The present invention further comprises stacking a plurality of stacked blocks each formed by stacking a plurality of unit stacks each formed by stacking a predetermined number of amorphous magnetic alloy ribbons, The present invention relates to a rectangular core having a structure in which both ends of each unit laminated body of each laminated block are overlapped and joined to form an overlapped joint.

In the present invention, the inside of the innermost laminate block,
Alternatively, a protective sheet made of a metal or a heat-resistant insulator having the same width as the amorphous magnetic alloy ribbon is laid inside the unit laminate of the innermost layer. This protective sheet is made of a material having heat resistance to withstand the annealing temperature of the amorphous magnetic alloy ribbon, and has a flexibility that can follow the deformation accompanying opening and closing of the lap joint of the unit laminate. It is formed sufficiently thin.

[Function] As described above, if a protective sheet is laid inside the innermost layered laminate block of the wound core or the innermost unit laminated body, it is used for shaping the wound core into a rectangular shape. When the rectangular shaping bracket is removed, the risk of damaging the amorphous magnetic alloy ribbon on the inner peripheral portion of the iron core can be reduced.

Also, as described above, the inside of the innermost layered laminate block of the wound core, or the innermost of the innermost layered unit laminate, is made of a material having heat resistance to withstand the annealing temperature of the amorphous magnetic alloy ribbon, If a protective sheet that is formed thin enough to have the flexibility to follow the deformation accompanying the opening and closing of the lap joint of the unit laminate is laid, the lap joint can be opened and the lap joint can be opened. When the cover is closed again, the protective sheet deforms following the deformation of the overlapped joint of the iron core without difficulty.Force force is applied from the protective sheet to the amorphous magnetic alloy ribbon on the inner periphery of the iron core. The possibility that the amorphous magnetic alloy ribbon on the inner periphery of the iron core is damaged can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an outline of the configuration of a wound core C according to the present invention. The wound iron core C is formed by laminating amorphous magnetic alloy ribbons (hereinafter, also simply referred to as ribbons) and forming it into a rectangular shape, and has a protective sheet P _s made of a stainless plate or the like on its inner peripheral surface. Are arranged.

In order to manufacture the wound core C, first, as shown in FIG. 2, the amorphous magnetic alloy ribbon F is wound around a winding frame (not shown).
A ring-shaped laminate R is formed. As described above, the thickness of the ribbon F is extremely thin, about 25 μm. FIG. 2 shows a state where the winding of the ribbon F is completed. After the winding of the ribbon is completed, the ribbon is cut off at the point X shown in the figure.
The ring-shaped laminate R is taken out. The ring-shaped laminate R is cut at one location in the lamination direction and developed to form a developed laminate S, and then a plurality of unit laminates U are formed, and a plurality of the unit laminates U are laminated. Laminated block B
Is wound around a plurality of winding frames, and both ends of each unit laminate U are overlapped and joined to produce an annular core C.

 Hereinafter, this process will be described step by step.

After forming the ring-shaped laminate R as shown in FIG.
Against the holding plate H ₁ and H ₂ in a part inner and outer circumferential sides of the ring-shaped stack R, as shown in FIG, tighten these holding plate using a C-clamp or the like. In FIG. 3, dashed lines C _p1 and C _p2 indicate portions to be tightened with a crook vise or the like.
The portion to be tightened is the center of the ribbon F in the width direction.

Then, the center portions of the holding plates H ₁ and H _{2 in} the longitudinal direction (broken line C _{t in the} figure)
In the part) that indicated, together with the holding plate H ₁ and H ₂ for cutting the ring-shaped laminate R in the stacking direction. By this cutting, the holding plate H ₁
And H _2, respectively, are divided into halves H _11, H ₁₂ and H _21, H _22.

After such cutting a ring-shaped laminate R, the one half of the cut holding plate, for example, which keeps tightened the halves H ₁₁ and H _21, clamping the other half of the holding plate Remove the vice etc. and remove the other half of the holding plate.

Then, as shown in FIG. 4, the cut ring-shaped laminated body R is linearly developed to form a developed laminated body S. The steps up to this point are the development laminate formation step.

The cut surface a at one end constrained by the half portions H ₁₁ and H ₂₁ of the holding plate of the developed laminate S is a laminate surface perpendicular to the longitudinal direction of the laminate, and the other unconstrained surface. The cut surface b is a laminate surface inclined with respect to the longitudinal direction of the laminate. After forming the spread laminates S, an adhesive is applied to a cut surface a on one end side of the developed laminate S. An agent application step is performed. The adhesive used here is suitably of a solvent-evaporating type, and in the examples, a diluting Plyobond (trade name) was used. After this adhesive is thinly applied to the cut surface a, the coating is dried by leaving it for several minutes. In FIGS. 4 and 5, this coating film is indicated by reference symbol A. In other drawings, the illustration of the coating film is omitted.

After the adhesive applied to the cut surface a is dried, halves H ₁₁ of the holding plate, as shown in FIG. 5, remove the H _21. Since the coating film A of the adhesive is formed on the cut surface a, half of the holding plate H ₁₁ ,
Ribbon F also remove the H ₂₁ is not readily be disjoint, expanded laminate S also acts a little external force is keeping its shape.

Next, the developed laminate S is divided into a plurality of unit laminates U by separating the ribbons F constituting the developed laminate S at predetermined thicknesses. In this case, it is appropriate to set the thickness of each unit laminate U to about 0.3 mm to 1.0 mm. These unit laminates are denoted by symbols U ₁ , U ₂ ,
...

Next, a laminate block forming step of assembling the laminate blocks B ₁ , B _2, ... Using several unit laminates of successive numbers is performed.

In this embodiment, it is assumed that one unit block is assembled using four unit stacks. Here, the unit laminate U ₁
~U _4, U ₅ ~U _8, the laminate blocks each configured sled B ₁ to ..., B _2, ... to.

Each laminated block is constituted by stacking only shifted in the longitudinal dimension [Delta] L _s shifting order relative to their respective positions from a short unit laminate platen. The reference shifting dimension ΔL _s is appropriate to no 5mm about 20mm.

Here the step of forming a laminated block B ₁ illustrating a laminated block forming process as an example. But Figure 6 is showing a structure of a laminated block B _1, to form the laminate block, a first unit laminated body U _1, the ribbon F is toward a shorter side in the lower plate (Not shown). The next unit stack U _2, stacked on top of the unit laminate U ₁ toward the ribbon is shorter side to the lower side. Offset arrangement only [Delta] L _s in the longitudinal direction with respect to the position of the cutting surface a position of the unit laminate U ₁ of the cut surface a of the unit laminate U ₂ this time.

In the same manner, the unit laminate U ₃ is stacked on the unit laminate U ₂ with its position shifted in the longitudinal direction, and the unit laminate U ₄ is further shifted on the unit laminate U _{3 in} the longitudinal direction. stacked to complete the laminate block B ₁ in.

The laminate blocks B ₂ , B ₃ ,... Are formed in exactly the same manner.

After the above-described laminated block forming step is completed, a protective sheet laying step and an overlapping joining step of overlapping and joining both ends of each unit laminated body in each laminated block are performed.

In this embodiment, a winding frame M for winding a laminate block as shown in FIG. 7 is used in these steps. The winding frame M is a first half portion M _b forming the recess M _b1 cross section U-shaped part of the outer periphery of the cylindrical portion, and a second half-portion M _c of the semi-cylindrical recess M _b1
A mated rectangular cross section of the joint shaping metal M _a within, connecting fitting M _d, the M _d disposed astride between the ends of both end and halves M _c halves M _b Have been. Connecting fitting M _d, M _d is fixed to the half-portion M _b and M _c by bolts (not shown), halves M _b and M _c are connected by winding frame M is assembled by these connecting fitting. In this embodiment, the halves M _b and M _c and the connection fittings M _d and M _d
These form the main part of the bobbin. Joint shaping bracket M _a
Are merely fitted in the recess _Mb1 and are not fixed.

The bobbin M is arranged on a horizontally arranged surface plate (not shown) with its central axis oriented vertically.
Although not shown, the surface plate is provided with a plurality of pins, and the pins are fitted into pin fitting holes provided in the winding frame M, whereby the winding frame M is fixed in a stopped state. It is designed to be fixed to the board.

Reel M for laminated block winding is have a symmetrical cross-sectional shape, the outer surface is a flat surface of the joint shaping metal M _a M _a1
It has a outer peripheral surface of a portion other than the flat surface and has a substantially (halves M _b, except the gap between the M _c) a cylindrical surface shape.
The position of the flat surface _Ma1 corresponds to the position of one side of the yoke side of the window portion of the rectangular iron core to be manufactured, and the length of the flat surface _Ma1 (the right and left ends are assumed to be straight lines) (Length in the horizontal direction) is set equal to the width of the window of the iron core. The outer peripheral length of the winding frame M (the length of the contour line of the cross section) is set equal to the inner peripheral length of the wound core.

In order to wind the laminate blocks B ₁ , B ₂ ,.
Although a winding device (not shown) is provided, its description is omitted.

Prior to winding of the laminated block in advance crowded laying a protective sheet P _s on the inner peripheral surface of the core C. This protective sheet
It is made of a material having heat resistance to withstand the annealing temperature of the amorphous magnetic alloy ribbon, and is formed thin enough to have the flexibility to follow the deformation accompanying the opening and closing of the lap joint of the unit laminate. ing. As the protective sheet, a stainless plate having a thickness of about several tens of μm is suitable, but an organic insulating material (for example, polyimide) having high heat resistance to withstand the annealing temperature and having sufficient flexibility before and after annealing (for example, polyimide) Resin) sheet can also be used. The width of the protective sheet P _s is the same as the width of the ribbon F. The protective sheet P _s laying as wrapped bobbin M, overlaying the both end portions at the position of the flat surface M _a1 reel M. The overlap size is arbitrary. Incidentally protective sheet P _s is decreased overlapping margin of the ribbon by using this because very thin are those insignificant of several hundred mu. After the process laying the protective sheet P _s, performs winding by superimposing bonded laminate block outside of the protective sheet P _s.

In the lap joining process, the laminated body blocks B ₁ , B ₂ ,... Are wound in order from the one having the shorter length, and one end on the cut surface a side to which each adhesive is applied is wound around the bobbin M as a starting end. At the position of the flat surface _Ma1 of the winding frame M, both ends of the unit laminated body in each laminated block are overlap-joined.

Figure 8 is an enlarged view of the joint overlay ribbon F in the process of winding the laminate block B in bobbin M, shows a laminated state to a third stack block B ₃ of the.

In this step, the first protective sheet P _s after elaborate spread on the outer peripheral surface of the winding frame M, to the unit without laminate U ₁ a laminate block B ₁ consisting of U ₄ in a state where the unit laminate U ₁ on the inside, winding frame M of the end face of the unit laminate U ₁ of the adhesive applied was cut surface a side
It is positioned in front of the point d at one end of the joint shaping metal M _a of.
The other end of the laminated block B ₁ joint shaping metal M _a →
Arcuate portion of the left side of the illustrated half M _b → right arcuate portion of the illustrated half part M _c → halves M _b → wrapped around a spool in the order of the joint shaping metal M _a, joint shaping metal M _In part a, unit laminates U ₁ to U ₄
At once.

Thus laminated block at the portion of the joint shaping metal M _a
Joined in a superimposed state the one end and the other end of the unit laminate B _1, distributed stepwise to units not stack U ₁ of the laminated block B ₁ a superposition junction U ₄ in the circumferential direction State.

When winding the laminated block B ₁ to the winding frame M, it is necessary to cause the longitudinal displacement between the ribbon F each other in each unit stack, the other cut surface b of each unit laminate
Since the adhesive is not applied to the side, the displacement between the ribbons is performed smoothly.

Results position in the unit stack of joint shaping metal M _a overlap, in the state where the wound laminated block B ₁ to the winding frame M,
Lamination thickness of the portion along the flat part of the joint shaping metal M _a of the laminated block is equal to the other stacking thickness of a portion (winding before the thickness of the laminated block B ₁ of the laminate block. ), The thickness is increased by the thickness of one unit laminate.

When wrapping the laminate block B ₁ in bobbin M, therefore the laminate thickness increases by overlapping joints, the circumferential length of the wound laminate block bobbin M is increased lamination thickness of the It is slightly longer than the circumference when there is no In this way, the lamination thickness at the overlapped joint is greater than other portions, so that the wound laminate block has a longer perimeter than if the lamination thickness had not been increased. . For this reason, in the overlap joining part, generally, a gap is generated between the end of the unit laminated body and its adjacent unit laminated body.

Note that g shown in FIG. 8 indicates an inter-laminate gap generated between adjacent unit laminates at the overlapped joint of the laminate blocks.

As shown in FIG. 9 after the winding of all of the laminate block is completed, the by facing the joint shaping metal M _a to the outside of the joint overlay plate-shaped retainer member K ₁ arranged, the joint overlay tightening the shaping metal M _a and retainer member K ₁ and the stacking direction of the core by a C-clamp or bolt or the like on both sides of the ribbon width direction of the core C to fix the joint. The chain lines C _p3 and C _p4 (both overlap in the width direction of the ribbon) shown in FIG. 9 indicate that this portion is tightened. K _1a is a hook attached to the bracket K _1, utilizing this hook when or move hanging core.

After the overlapping joint is fixed, among the constituent members of the bobbin M, other members except for the joint shaping metal _{M a (M b, M c} , M d) remove.

First, withdrawn bolts (not shown) that is threaded into fitting M _d remove metal M _d. The removal of metal M _d, since closing the gap between the M _b and M _c, loosened between the inner peripheral portion of the halves M _b and M _c and the iron core C of the winding frame M, halves M _b and it can be withdrawn M _c facilitated. The state was drawn halves M _b and M _c of the bobbin shown in FIG. 10.

Next, a step of shaping the iron core C into a rectangular shape is performed. And _{C 1, C2, C 3,} C 4 to winding direction around the stack block (counterclockwise) in FIG. 11 the four sides of the post rectangular shaping of the core C. C
₁ and C ₃ are the yoke, C ₂ and C ₄ are the legs (the part where the windings are fitted), and the yoke with the overlapping joining of the ribbons is C ₁
And

In the state of FIG. 10, the core C is not square shaped, the yoke portion C ₁ when the joint overlay ribbon already tightened and the joint shaping metal M _a and retainer member K ₁ rectangular It is shaped into one side. Therefore the yoke C ₃ and legs
C ₂ and C ₄ may be shaped so as to form the other three sides of the rectangle.

In order to shape the yoke C ₃ and the legs C ₂ and C ₄ , a rectangular shaping bracket D having a shape corresponding to the shape of the window of the rectangular iron core is provided inside the iron core C shown in FIG. insert.

Joint shaping metal M _a of the winding frame M is in this embodiment also serves as a part of the rectangular shaped metal D. FIG. 11 shows a state in which the core is inserted a rectangular-shaped bracket D inside the core was shaped into a rectangular shape, in this example, to rectangular shaping metal D is no joint shaping metal M _a and fittings D _a D _f . That is,
Position opposite to the junction shaping metal M _a (yoke portions C ₃ side position)
Rectangular tubular fitting D _a is arranged, rectangular tubular metal fitting D _b is disposed between the the joint portion shaping metal M _a and fittings D _a to. The width dimension of the fitting D _a is set to be equal to the width of the window of the rectangular iron core, but the width of the fitting D _b is set to be narrower than the fitting D _a , and a plate is attached along both side walls of the fitting D _b. Metal fittings _Dc and _Dd are arranged. The width of the joint shaping metal M _a is set equal to the width of the metal D _b except that end of the flat portion (outer edge),
The joint portion shaping metal fittings in Sowase both side walls plate of M _a D _e and D _f are arranged.

When the rectangular shaping bracket D is divided into a number of members as described above, it is easy to insert the rectangular shaping bracket into the window inside the iron core and to remove the rectangular shaping bracket from the window. it can.

After the rectangular shaping bracket D is inserted into the inside of the iron core C to adjust the shape of the inner peripheral side of the iron core, as shown in FIG.
Between the retainer member K ₂ and K ₄ by to K ₂ no C-clamp or the like by applying a K ₄ to the outside of the core C, between the retainer member K ₁ and junction shaping metal M _a and retainer member K ₃ and bracket The shape of the outer peripheral portion of the iron core C is adjusted by tightening the space between the iron core C and D _a . In FIG. 11, dashed lines C _p5 to C _p10 indicate fastening positions at the time of shaping the iron core. That is, the chain lines C _p5 and C _p6 (the rectangular shaping brackets are interposed and overlap in the width direction of the ribbon on the C ₁ side of the iron cores C ₂ and C ₄ ) and C _p7 and C _p8 (the rectangular shaping brackets are interposed). and.) that overlap in the widthwise direction of the ribbon at C ₃ side in the core C ₂ and C ₄ parts in the shows the location tightening between retainer member K _2, K _4. The (overlap in the widthwise direction of the ribbon in the core C ₃ parts.) Chain line C _p9, C _p10 indicates the position clamped between the retainer member K ₃ and fitting D _a. The chain lines C _p3 and C _p4 have already been described.

As described above, if the iron core is subjected to rectangular shaping with the overlapping core joints constrained, the overlapping joints of the unit laminated body do not move during the shaping process, so the overlapping joints after shaping the iron core The state of the part can be maintained as it is, and a high quality iron core can be obtained without any disturbance of the overlapped joint.

After shaping the iron core into a rectangular shape, the iron core is subjected to magnetic field annealing to remove the strain applied to the ribbon in the manufacturing process of the iron core, thereby recovering the magnetic characteristics reduced by the distortion. In some cases, annealing is performed without applying a magnetic field instead of magnetic field annealing.

After annealing, the components of the rectangular shaping bracket attached to the iron core C are removed to obtain a rectangular wound iron core as shown in FIG.

The attachment then not shown on the outer surface of the core C yoke portion C ₃ and leg C _2, C ₄ of the reinforcing plate or insulating paper, such as protection of, the yoke portion C ₁
Is opened, and the iron core C is once kept in a U-shape. In this state, the windings (not shown) are fitted to the legs C ₂ and C ₄ , and then the yoke C ₁ is closed again to protect the yoke C ₁ of the iron core C with a reinforcing plate (not shown) or insulating paper. An object is attached to complete the stationary induction electric equipment body.

Since the ribbon after annealing is extremely brittle, great care must be taken when removing the rectangular shaping bracket D from the iron core window. If you leave by interposing a protective sheet P _s between the inner peripheral surface of the rectangular shaped metal D and the iron core as in the present embodiment, damage the thin ribbon when performing the work of taking out the rectangle shaped bracket almost no Absent.

Since the protective sheet P _s have greater flexibility (softness), readily follow the deformation during opening and closing of the overlapping junctions. Therefore, the provision of the protective sheet does not hinder the opening / closing operation of the overlapped joint.

When opening and closing the lap joint, the most stress and external force are applied to the inner ribbon of the core, and the inner periphery of the iron core is easily damaged. If you leave crowded laying a protective sheet P _s, the thin strip is also less subject to damage in the above-mentioned work.

After annealing the iron core, a frame made of an iron plate or the like may be fitted as a reinforcing material into the window of the iron core. Idea crowded spread on the inner peripheral surface of the core of the protective sheet P _s as in this embodiment, the risk of ribbon is damaged when performing the work of fitting such a reinforcement on the inner peripheral portion of the core Can be reduced.

Note in the above embodiment, after elaborate laid protective sheet P _s, was to winding the laminate block B ₁ on the outside thereof, as a variant, the protective sheet P _s on the inside of the unit laminate U ₁ You can also lay it down. FIG. 12 is an enlarged view of the vicinity of the overlapped joint of the laminate block wound around the bobbin in this modification, and is a view corresponding to FIG. 8 of the above embodiment.

The point Figure 12 is different from FIG. 8, in the overlapping portion of the protective sheet P _s. Since the protective sheet P _s has a longer longitudinal dimension than the length of the inner diameter-side surface of the unit laminate body U ₁ in Figure 12, over both ends of the protective sheet P _s via the unit laminate body U ₁ I'm wrapping.

In this modification, in the laminate block forming step,
Among the plurality of unit laminate, the length was located in the shortest unit inner diameter side of the stack U ₁ surface, longer length dimension than substantially equal to or longitudinal dimension in the longitudinal dimension of said surface Komu substantially laid protective sheet P _s of metal or heat-resistant insulating material having a same width as the width of the amorphous magnetic alloy ribbon with. The other unit laminates U ₂ ,..., U ₄ are laminated on the unit laminate U ₁ on which the protective sheet is laid, by shifting their positions in the longitudinal direction in ascending order of length. th to form a laminate block B _1.

When Komu laying a protective sheet P _s on the surface of the inner diameter side of the unit laminate body U _1, move the end one end of the unit laminate body U ₁ of the protective sheet P _s (adhesive A is coated side) deep. Protective sheet
When the length of P _s is longer than the longitudinal dimension of the inner diameter-side surface of the unit laminate body U ₁ is the unit laminate U ₁ and the other end of the protective sheet P _s in performing the superposition junction and U Insert it into between ₂ .

Further, by stacking another plurality of unit laminates U ₅ ,... In order of decreasing length in the longitudinal direction, the second and subsequent laminate blocks B ₂ ,.

[Effect of the Invention] As described above, according to the present invention, the amorphous magnetic alloy ribbon is made of a material having heat resistance to withstand the annealing temperature,
Since the protective sheet formed sufficiently thin so as to have the flexibility to follow the deformation accompanying the opening and closing of the lap joint of the unit laminate is laid on the inner peripheral surface of the iron core, when removing the rectangular shaping bracket, When opening the lap joint and closing the lap joint again, the risk of damaging the ribbon at the inner peripheral portion of the iron core can be reduced.

In addition, since the inner peripheral portion of the iron core is protected, care when handling the iron core after annealing is reduced, so that work efficiency can be improved.

[Brief description of the drawings]

1 to 11 show an embodiment of the present invention.
FIG. 1 is a front view showing a completed state of a wound core, FIG. 2 is a front view showing a state in which a ribbon is wound, FIG. 3 is a front view showing a state in which a ring-shaped laminate is held by a holding plate, FIG. 4 is a front view in which a part of a developed laminate formed by cutting one portion of the ring-shaped laminate of FIG. 3 is omitted, and FIG. 5 shows a holding plate from the unit laminate of FIG. FIG. 6 is a front view partially showing the removed state, FIG. 6 is a front view partially showing the state in which unit laminates are stacked to form one laminate block, and FIG. 7 is a laminate. FIG. 8 is a plan view showing a winding frame for block winding, FIG. 8 is an enlarged view of the vicinity of a superposed joint of the laminate block wound on the winding frame of FIG. 7, and FIG. 9 is a drawing of the winding frame of FIG. FIG. 10 is a front view showing a state in which an iron core is formed by winding all the laminate blocks, and FIG. 10 shows a state in which a bobbin is removed from the iron core in FIG. FIG. 11 is a front view showing a state in which the iron core of FIG. 10 is shaped into a rectangular shape, and FIG. It is the elements on larger scale near the joint part. R ...... ring-like laminate, C ...... core, H _1, H ₂ ...... holding plate, S ...... expanded laminate, coating A ...... adhesive, U ₁ ~U ₁₂
...... unit laminate body, B ₁ ~B ₃ ...... laminated block, M ...... bobbin, M _a ...... junction shaping fitting, P _s ...... protective sheet.

Continued on the front page (72) Inventor Masatake Hirai 2-1-1-11 Tagawa, Yodogawa-ku, Osaka-shi, Japan Daihen Corporation (72) Inventor Toshiko Yamada 2-1-1-11 Tagawa, Yodogawa-ku, Osaka-shi, Japan Shares (56) References JP-A-59-175110 (JP, A) JP-A-62-292616 (JP, U) JP-A-61-76938 (JP, U)

Claims (2)

(57) [Claims] 1. A unit stack of a plurality of unit laminates formed by laminating a plurality of unit laminates each formed by laminating a predetermined number of amorphous magnetic alloy ribbons, and each unit laminate of each laminate block In a rectangular wound iron core having a structure in which both ends of a body are joined in a state of being overlapped to form an overlapped joint, the same width as the amorphous magnetic alloy ribbon is provided inside the innermost laminated block. A protective sheet made of metal or a heat-resistant insulator is laid, and the protective sheet is made of a heat-resistant material that withstands the annealing temperature of the amorphous magnetic alloy ribbon. A wound iron core characterized in that it is formed sufficiently thin so as to have flexibility capable of following deformation caused by opening and closing of a joint. 2. A plurality of unit blocks each formed by laminating a plurality of unit laminates each formed by laminating a predetermined number of amorphous magnetic alloy ribbons. In a rectangular wound iron core having a structure in which both ends of a body are joined in an overlapping state to form an overlapped joint, the same width as the amorphous magnetic alloy ribbon is provided inside the innermost unit laminate. A protective sheet made of metal or a heat-resistant insulator is laid, and the protective sheet is made of a heat-resistant material that withstands the annealing temperature of the amorphous magnetic alloy ribbon. A wound iron core characterized in that it is formed sufficiently thin so as to have flexibility capable of following deformation caused by opening and closing of a joint.