JP2015142095A - Stationary induction apparatus and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction apparatus capable of utilizing an advantage of a known Y-shaped iron core while suppressing magnetic flux leakage and an increase in iron loss as problems of the known Y-shaped iron core as much as possible, and including a strong iron core.SOLUTION: An iron core has one layer formed by arranging three substantially U-shaped iron cores each having a yoke formation part in both ends of a leg formation part so that the leg formation parts are arranged at a substantially 120 degrees centering around a predetermined point, and allowing the yoke formation parts to be in contact with each other. The leg formation part and the yoke formation part are formed by laminating the plurality of layers of U-shaped iron cores, and have a lap joint structure in which a part of the yoke formation part of one U-shaped iron cores after the second layer from the inside is sequentially laminated on the yoke formation part of the U-shaped iron core of the previous layer forming another leg formation part different from the one U-shaped iron core. A coil is provided in the three leg formation parts of the iron core. Fastening and fixing means sandwiches the lap joint structure of the yoke formation part with two clamp plates opposed to each other to fasten and fix it.

Description

  Embodiments described herein relate generally to a stationary induction device and a manufacturing method thereof.

  A three-phase stationary induction device core, for example, a three-phase transformer core, is constructed by laminating magnetic steel sheets cut into strips in order, and laminating them in the circumferential direction while winding the electromagnetic steel sheets. Broadly divided into wound cores. There are two types of wound cores: an Evans iron core in which two inner cores and one outer core are arranged in the same stacking direction, and a five-legged iron core that is configured by arranging four iron cores horizontally. Among these, in particular, the Evans iron core 1 shown in FIG. 15 (see FIG. 4 of Patent Document 1) is composed of iron cores of two different sizes (inner core 2 and outer core 3). When the iron core surrounded by the W-phase coil is different between the V-phase, the U-phase, and the W-phase, the magnetic flux waveform is distorted and the iron loss is deteriorated. Furthermore, the outer core 3 is longer in material than the inner core 2 in order to magnetically connect the U-phase and W-phase coils in a plan view. Since magnetic flux also flows through the extra length of the iron core, iron loss is generated as much, and it is necessary to improve today when the demand for energy saving has increased.

  On the other hand, Patent Documents 2 and 3 propose three-dimensional iron cores (hereinafter referred to as delta-shaped iron cores) in which three iron cores having the same shape of a frame are three-dimensionally formed into a triangular prism shape. This delta type core has three coils arranged closest to each other and connected between them with the same shape core to eliminate the extra core part as much as possible and make the magnetic flux density uniform to reduce iron loss and use materials The purpose is to reduce the amount.

  However, delta type iron cores can use only cylindrical coils in order to keep the legs in the coil cross section with a high space factor, and it is necessary to form the iron core legs in a circular cross section. It is necessary to wind the hoop while gradual slitting (shifting). The slit needs to have high accuracy, otherwise the space factor will decrease. Even if it is difficult to form the legs of the iron core in a circular cross section, and the slit accuracy deteriorates, it is necessary to increase the coil diameter in order to obtain the required iron core cross-sectional area even if the three-dimensional iron core is formed. Further, if the coil diameter is further increased, the size of the iron core (yoke) that connects the coils also increases, so the effect of reducing iron loss and reducing the amount of material used is diminished.

JP 2005-136059 A (see FIG. 4) Japanese Examined Patent Publication No. 28-1307 (see Fig. 3) Special table 2013-539215 gazette (refer FIG. 4) Japanese Utility Model Publication No.33-2827 (see FIGS. 2 and 3)

  In recent years, there has been a worldwide demand for energy saving and high efficiency in electrical equipment to prevent global warming, and further improvement in efficiency is demanded in stationary induction equipment such as transformers. For example, the loss of a transformer, which is a kind of static induction device, includes a load loss (copper loss) caused by energizing a winding conductor and a no-load loss (iron loss) caused by exciting an iron core. . Since the iron loss is continuously generated even when no load is applied when the transformer is connected to the electric circuit, further reduction is required.

  As described above, the iron core of the stationary induction device is roughly classified into a stacked iron core and a wound iron core, but the latter is a structure suitable for reducing iron loss because there are few places where electromagnetic steel sheets are connected. The Evans iron core 1 (refer FIG. 15) mentioned above is mentioned to the general structure of a wound iron core. FIG. 16 is a characteristic diagram showing changes in iron loss and iron core weight (vertical axis) with respect to the magnetic path length ratio (horizontal axis) between the outer core and the inner core. In this case, the magnetic path length of the outer core is Lo, the magnetic path length of the inner core is Li, and the magnetic path length ratio between the outer core and the inner core is Lo / Li. FIG. 16 shows the result of actual measurement for an uncut ring-shaped iron core. As is apparent from this characteristic diagram, the iron loss and the iron core weight decrease as the magnetic path length ratio decreases. An example where the magnetic path length ratio is 1.0 corresponds to the structure of the delta iron core. Thus, if the iron core cross section and the iron core window (that corresponds to the dimensions of the coil) are used, it can be said that the delta iron core has an ideal iron core structure.

  However, the actual delta-type iron core has a core space factor in the coil cross section that is not as high as that of the Evans iron core 1, and it is necessary to enlarge the coil in order to have the same iron core cross section. As a result, the iron loss and the iron core weight increase. In addition, there is a current situation that a high dimensional accuracy is required to make the iron core leg into a circular cross section and that the space factor cannot be increased as much as the Evans iron core 1.

  On the other hand, in the example of FIG. 2 and FIG. 3 of Patent Document 4, a three-phase transformer core having the following configuration is shown. As shown in FIG. 17, each of the legs 5a and three U-shaped core bodies 5 each having a substantially U-shape having yoke forming portions 5b at both ends of the legs 5a and a triangular column shape having a low height are provided. Two yoke parts 6 are provided, and three U-shaped core bodies 5 are arranged so that each leg 5a is arranged at 120 degrees around a predetermined point in a state of being horizontally oriented, and upper and lower yoke forming parts The central yoke portion 6 is disposed in the central portion of 5b, and these are joined at the end faces. This configuration is Y-shaped in plan view, and is hereinafter referred to as a conventional Y-shaped iron core 7. This conventional Y-shaped iron core 7 has an effect that is almost the same as that of the delta-shaped iron core, that is, the same magnetic path length is distributed to each leg, and the extra iron core can be reduced as much as possible. Moreover, unlike the conventional delta core, there is an advantage that a high core space factor can be maintained not only for the circular cross-section coil but also for the square cross-section coil. In FIG. 17, an arrow A indicates the direction in which the magnetic flux flows.

  However, the conventional Y-shaped iron core 7 has the following problems. Three U-shaped core bodies 5 and two central yoke portions 6 are required. The upper and lower yoke forming portions 5b in the three U-shaped core bodies 5 must be joined to the triangular central yoke portion 6 at their end surfaces. Those joint portions are denoted by reference numeral 8. As means for joining each yoke forming part 5b and the central yoke part 6, adhesion by an adhesive and welding such as spot welding can be considered. In either case, since the end surface of the yoke forming portion 5b and the end surface of the central yoke portion 6 are bonded to each other, leakage magnetic flux is likely to be generated at the bonding surface, and iron loss is likely to increase. . In particular, in the case of bonding with an adhesive, it is inevitable that a gap is formed at each joint 8. If a gap is formed at the joint 8, leakage magnetic flux is likely to occur, and excitation current is deteriorated and iron loss is likely to increase. In the case of welding, the steel sheet is easily damaged by heat, the characteristics are deteriorated, and the iron loss is easily increased.

  Therefore, while taking advantage of the conventional Y-shaped iron core, it is possible to suppress the increase in magnetic flux leakage and iron loss, which are the problems of the conventional Y-shaped iron core, and a stationary induction device having a strong iron core and its A manufacturing method is provided.

  The stationary induction device according to the present embodiment includes an iron core for a stationary induction device, a coil, and a fastening means. The iron core for a stationary induction device has three U-shaped iron cores having a substantially U shape having one leg forming portion and yoke forming portions at both ends of the leg forming portion. The yoke forming portions are abutted with each other in a state of being arranged at approximately 120 degrees around the center, and the leg forming portion and the yoke forming portion are formed by stacking a plurality of the U-shaped iron cores. The yoke of the U-shaped iron core of the front layer in which a part of the yoke forming portion of one U-shaped iron core after the second layer from the inside forms another leg forming portion different from the one U-shaped iron core A lap joint structure is formed so as to sequentially overlap the forming portion. The coil is provided at three leg forming portions of the iron core. The clamping and fixing means clamps and fixes the lap joint structure portion of the yoke forming portion between two opposing clamp plates in the iron core.

The perspective view which shows roughly the whole structure of the transformer (static induction apparatus) in 1st Embodiment. The iron core and the fastening means are shown, (a) is an exploded perspective view showing the fastening means, and (b) is a perspective view with the fastening means tightened. Perspective view of iron core alone Diagram explaining assembly structure of iron core Disassembled perspective view of the fastening means The figure which shows the structure of 3 sets of U-shaped iron core units, and the relationship of a coil The assembly procedure of the transformer will be described. (A) is a perspective view showing a state in which three sets of U-shaped core units equipped with coils are combined, and (b) shows a state in which fastening means are attached to the core. The perspective view, (c) is a diagram showing the completed state of the transformer FIG. 3 shows a fastening and fixing means according to a second embodiment, wherein (a) is an exploded perspective view and (b) is a perspective view in an assembled state. FIG. 9 shows a fastening means according to a third embodiment, wherein (a) is an exploded perspective view, and (b) is a perspective view in an assembled state. The perspective view which shows schematically the whole structure of the transformer (static induction apparatus) in 4th Embodiment. Perspective view showing iron core and fastening means Perspective view showing the fastening means Disassembled perspective view of the fastening means Perspective view of the transformer shown in the middle of assembly of the fastening means Evans iron core front view Characteristic diagram showing the relationship between magnetic path length ratio, iron loss and total core weight An exploded perspective view showing a conventional Y-shaped iron core

Hereinafter, stationary guidance devices according to a plurality of embodiments will be described with reference to the drawings. In addition, in each embodiment, the same code | symbol is attached | subjected to the substantially same component, and description is abbreviate | omitted.
(First embodiment)
First, a first embodiment will be described with reference to FIGS. The static induction device of the first embodiment is a three-phase transformer. FIG. 1 shows a schematic configuration of a three-phase transformer 10. The transformer 10 includes an iron core 11 for a transformer that constitutes an iron core for a static induction device, three coils 12, and a pair of tightening and fixing means 13.

  Among these, as shown in FIG. 3, the transformer core 11 includes three sets of U-shaped core units 14, 15, 16, and these three sets of U-shaped core units 14, 15, 16 will be described later. It is formed by uniting. Each of the three sets of U-shaped iron core units 14, 15, 16 is formed by stacking a plurality of U-shaped iron cores 17 made of electromagnetic steel plates, in this case, four layers. Each U-shaped iron core 17 integrally includes a leg forming portion 18 extending in the vertical direction and a pair of yoke forming portions 19 that are bent by 90 degrees from both ends of the leg forming portion 18 and face each other. U-shaped.

  The three U-shaped iron cores 17 of the first layer in the three sets of U-shaped iron core units 14, 15, 16 are arranged so that the respective leg forming portions 18 are arranged approximately 120 degrees around a predetermined point. In this state, one layer is formed by abutting the upper and lower yoke forming portions 19 together. The leg forming portion 18 and the yoke forming portion 19 are formed by stacking four U-shaped iron cores 17. As will be described later, a part of the yoke forming portion 19 of one U-shaped iron core 17 in the second and subsequent layers from the inside forms another leg forming portion 18 different from the one U-shaped iron core 17. The lap joint structure 20 is formed at the central portion of the yoke forming portion 19 by sequentially overlapping the yoke forming portion 19 of the U-shaped iron core 17 of the front layer.

In the iron core 11 formed in this manner, the three leg forming portions 18 are arranged at approximately 120 degrees around a predetermined point, and the upper and lower yoke forming portions 19 have a Y-shape.
Here, in the iron core 11 having such a configuration, a configuration in which the yoke forming portions 19 are sequentially overlapped to form the lap joint structure 20 will be described with reference to FIG. (A) shows a state in which the U-shaped iron core 17 is stacked up to the second layer. In the second layer, the yoke forming portion 19 of the U-shaped iron core 17-1 that forms the leg forming portion 18 on the left front side is set longer than the yoke forming portions 19 of the other two U-shaped iron cores 17. . Thereby, the front-end | tip part of the yoke formation part 19 of the U-shaped iron core 17-1 becomes the form which occupied the center part of the Y-shaped yoke formation part.

  (B) shows a state in which the U-shaped iron core 17-2 in the third layer is superimposed on the U-shaped iron core 17-1 in the second layer on the left front side. The length of the yoke forming portion 19 of the U-shaped iron core 17-2 is set to be shorter than the yoke forming portion 19 of the U-shaped iron core 17-1 in the second layer. Accordingly, the central portion of the third-layer yoke forming portion is vacant, and the yoke-forming portion 19 of the second-layer U-shaped iron core 17-1 is exposed. (C) shows a state in which the U-shaped iron core 17 in the third layer is superimposed on the U-shaped iron core 17 in the second layer on the back side. The length of the yoke forming portion 19 of the third-layer U-shaped iron core 17-3 is set longer than the yoke forming portion 19 of the second-layer U-shaped iron core 17. As a result, the tip of the yoke forming portion 19 of the U-shaped iron core 17-3 is overlapped with the tip of the yoke forming portion 19 of the U-shaped iron core 17-1 in the second layer from the top. The central portion of the Y-shaped yoke forming portion is occupied.

  (D) shows a state in which the U-shaped iron core 17-4 of the third layer is superimposed on the U-shaped iron core 17 of the second layer on the right front side. The length of the yoke forming portion 19 of the U-shaped iron core 17-4 is set to be the same as that of the yoke forming portion 19 of the U-shaped iron core 17 in the second layer. In connection with this, the front-end | tip part of the yoke formation part 19 of the U-shaped iron core 17-4 is contact | abutting to the front-end | tip part of the U-shaped iron core 17-3 of the back | latter layer. Thereby, it will be in the state which accumulated the U-shaped iron core 17 to the 3rd layer.

  (E) shows a state in which the U-shaped iron core 17-5 in the fourth layer is superimposed on the U-shaped iron core 17-2 in the third layer on the left front side. The length of the yoke forming portion 19 of the U-shaped iron core 17-5 is set shorter than that of the yoke forming portion 19 of the third U-shaped iron core 17-2. Accordingly, the central portion of the fourth-layer yoke forming portion is vacant, and the yoke-forming portion 19 of the third-layer U-shaped iron core 17-3 is exposed. (F) shows a state in which the U-shaped iron core 17-3 in the fourth layer is superimposed on the U-shaped iron core 17-3 in the third layer on the back side. The length of the yoke forming portion 19 of the U-shaped iron core 17-6 of the fourth layer is set shorter than the yoke forming portion 19 of the U-shaped iron core 17-3 of the third layer. Accordingly, the central portion of the fourth-layer yoke forming portion is vacant, and the yoke-forming portion 19 of the third-layer U-shaped iron core 17-3 is exposed.

  (G) shows a state in which the U-shaped iron core 17-7 in the fourth layer is superimposed on the U-shaped iron core 17-4 in the third layer on the right front side. The length of the yoke forming portion 19 of the U-shaped iron core 17-7 is set longer than that of the yoke forming portion 19 of the third U-shaped iron core 17-3. Accordingly, the tip of the yoke forming portion 19 of the U-shaped iron core 17-7 occupies the center of the fourth-layer yoke forming portion, and the other U-shaped iron core 17-5 of the fourth layer is formed. And 17-6 are in contact with the tip. Thereby, it will be in the state which accumulated the U-shaped iron core 17 to the 4th layer.

  Here, in the iron core 11 configured as described above, a lap joint structure 20 in which the yoke forming portions 19 from three directions overlap is formed at the central portion of the upper and lower Y-shaped yoke forming portions. As shown in FIG. 1, the coil 12 has an annular shape, in this case, a rectangular annular shape (frame shape), and is attached to each leg forming portion of the three sets of U-shaped core units 14, 15, and 16. Yes. Each coil 12 is a square section coil.

  The tightening and fixing means 13 fastens and fixes the lap joint structure 20 portion of the iron core 11 and is provided at two upper and lower portions corresponding to the upper and lower lap joint structure 20 portions. As shown in FIG. 5, the tightening and fixing means 13 includes two upper and lower clamp plates 22 and three sets of column portions 23 that connect the two clamp plates 22. The two clamp plates 22 each have a triangular shape, and a circular insertion hole 24 is formed inside each corner. Each of the three sets of column portions 23 includes a cylindrical tube member 25 disposed between two clamp plates 22, a bolt 26, and a nut 27. The bolt 26 has a head portion 26a at one end and a male screw portion 26b at the other end. The nut 27 has a female screw portion 27a that is a screw hole screwed into the male screw portion 26b.

  The fastening means 13 is attached to the lap joint structure 20 portion of the iron core 11 as follows. As shown in FIG. 2, two clamp plates 22 are arranged so as to sandwich the lap joint structure 20 portion from above and below, and three cylindrical members 25 are arranged between the two clamp plates 22. At this time, the upper and lower clamp plates 22 are positioned at three corner portions 28 (see FIG. 3) where the three insertion holes 24 and the cylindrical member 25 are formed between the yoke forming portions 19 adjacent to each other in the iron core 11. Arrange to do.

  Then, the tip portions of the three bolts 26 are inserted through the insertion hole 24 of one clamp plate 22, the through hole of the cylindrical member 25, and the insertion hole 24 of the other clamp plate 22 in order, and two pieces The two clamp plates 22 are connected by screwing the female screw portion 27a of the nut 27 into the male screw portion 26b protruding from the clamp plate 22 of the eye. Thereby, the lap joint structure 20 part in the iron core 11 can be clamped and fixed by being sandwiched between the two clamp plates 22. At this time, the three cylindrical members 25 positioned between the two clamp plates 22 are positioned at three corner portions 28 formed between adjacent yoke forming portions 19 in the iron core 11.

  Next, a method for manufacturing the transformer 10 will be described. First, as shown in FIG. 7A, the square coil 12 is mounted on the leg forming portion 18 of each of the three sets of U-shaped core units 14, 15, 16. FIG. 6 shows a relationship between the coil 12 and the way in which the U-shaped cores 17 are overlapped in each U-shaped core unit 14, 15, 16. Each U-shaped iron core unit 14, 15, 16 has a protruding portion and a retracting portion in the U-shaped iron core 17 on the tip side of the yoke forming portion 19, and is in an intricate form.

  Then, the three sets of U-shaped core units 14, 15, and 16 equipped with the coils 12 are combined so that the tip portions of the respective yoke forming portions 19 face each other (see FIG. 7B). As a result, the yoke forming portions 19 of the U-shaped iron core 17 in the U-shaped iron core units 14, 15, 16 of each set overlap each other, and the above-described lap joint structure 20 is provided at each central portion of the upper and lower yoke forming portions 19. Will be formed. Further, the leg forming portions 18 of the three sets of U-shaped iron core units 14, 15, and 16 are arranged so as to be arranged at approximately 120 degrees around a predetermined point.

  Next, the fastening fixing means 13 is attached to the upper and lower lap joining structure 20 portions as described above, thereby fastening and fixing each lap joining structure 20 portion (see FIGS. 7B and 7C). In this case, in the upper clamping and fixing means 13, the bolts 26 are inserted from above into the two clamp plates 22 and the cylindrical member 25, and in the lower clamping and fixing means 13, two bolts 26 are inserted. The clamp plate 22 and the cylindrical member 25 are inserted from below. As a result, the three sets of U-shaped iron core units 14, 15, 16 are firmly connected by the two upper and lower sets of tightening and fixing means 13, and the strong iron core 11 and thus the transformer 10 can be formed.

  At this time, each cylindrical member 25 positioned between the two clamp plates 22 is positioned at three corner portions 28 formed between adjacent yoke forming portions 19 in the iron core 11. As a result, one cylindrical member 25 positions the two surfaces of the two adjacent yoke forming portions 19, and the three cylindrical members 25 position all six surfaces of the yoke forming portion 19. Can do.

According to the above-described embodiment, the following operational effects can be obtained.
As the iron core 11 for a transformer, three sets of U-shaped iron core units 14, 15, 16 configured by stacking a plurality of U-shaped iron cores 17 are combined, and the leg forming portion 18 is centered on a predetermined point. The yoke forming portion 19 has a lap joint structure 20 in a state of being arranged so as to be approximately 120 degrees. Thereby, similarly to the conventional Y-shaped iron core 7, an equal magnetic path length can be distributed to each leg, and an extra iron core can be reduced as much as possible. Moreover, unlike the conventional delta core, there is an advantage that a high core space factor can be maintained not only for the circular cross-section coil but also for the coil 12 having a square cross section.

  Further, since the lap joint structure 20 is formed in the central portion of the Y-shaped yoke forming portion 19 in which a plurality of yoke forming portions 19 overlap, the magnetic flux flowing from one leg to the adjacent leg is It is easy to flow not only in the extending direction of the part 19 but also in the overlapping direction (lapping direction), which is different from the conventional Y-shaped iron core 7 in which the yoke forming part 5b and the triangular central yoke part 6 are joined. The flow of magnetic flux is smooth, the occurrence of leakage magnetic flux at the joint is small, and it is possible to suppress the increase in iron loss and the increase in excitation current as much as possible.

  In addition, a strong iron core 11 can be configured by providing the fixing means 13 for clamping and fixing the lap joint structure 20 portion between the two clamp plates 22, thereby forming a strong transformer 10. be able to.

  The tightening and fixing means 13 has column portions 23 positioned at three corner portions 28 formed between adjacent yoke forming portions 19, and the two clamp plates 22 are tightened by the column portions 23. It was set as the structure which clamp | tightens and fixes 20 lap joining structure 20 part. As a result, as described above, the two surfaces of the two yoke forming portions 19 where the cylindrical member 25 in the column portion 23 is adjacent are positioned, and the six surfaces of the yoke forming portion 19 are formed by the three cylindrical members 25. All the positioning can be performed, and the deviation of the U-shaped iron core 17 can be effectively prevented. In this case, the provision of the tightening and fixing means 13 is advantageous in that it is not necessary to perform special processing such as drilling on the iron core 11 side.

  Further, three sets of U-shaped core units 14, 15, 16 configured by stacking a plurality of U-shaped cores 17 are provided, and each leg forming portion 18 of these three sets of U-shaped core units 14, 15, 16 is provided. The coil 12 formed in an annular shape is mounted, and thereafter, the three U-shaped core units 14, 15 and 16 are combined to form the core 11 having the lap joint structure 20 in the yoke forming portion 19. Thereafter, the lap joint structure 20 portion is clamped and fixed by being sandwiched between two opposing clamp plates 22 provided in the clamp fixing means 13. By adopting such a manufacturing method, the coil 12 can be easily mounted, and the space occupancy of the coil 12 can be increased, and the compact transformer 10 can be formed.

(Second Embodiment)
FIG. 8 shows a second embodiment. The second embodiment is different from the first embodiment in the configuration of the cylindrical member of the column portion 23 in the tightening and fixing means 13. The cylindrical members 30 and 31 are divided into two in the vertical direction, and are fixed to the clamp plate 22 by welding or the like. In this case, the tip of the bolt 26 is inserted through the insertion hole 24 of the one clamp plate 22, the insertion hole of the cylindrical member 30, the insertion hole of the cylindrical member 31, and the insertion hole 24 of the other clamp plate 22 in order. The nut 27 is fastened to the male thread portion 26 b at the tip portion protruding from the hole 24. A gap is formed between the upper and lower cylindrical members 30 and 31. In the second embodiment, the same effects as those of the first embodiment can be obtained.

(Third embodiment)
FIG. 9 shows a third embodiment. The third embodiment differs from the second embodiment in the following points. In FIG. 9A, a female screw portion 32 a is formed in the insertion hole of the cylindrical member 32 fixed to the lower clamp plate 22. The length of the bolt 33 in the vertical direction is set shorter than that of the bolt 26 in the first and second embodiments, and a male screw portion 33b is formed at the tip. The nut 27 is not provided.

  In this case, the distal end portion of the bolt 33 is inserted into the insertion hole 24 of the one clamp plate 22 and the insertion hole of the cylindrical member 30, and the male screw portion 33 b at the distal end portion is screwed into the female screw portion 32 a of the cylindrical member 32. Thus, the two clamp plates 22 are connected. A gap is formed between the upper and lower cylindrical members 30 and 32. According to the third embodiment, there is an advantage that the nut 27 can be eliminated.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. In this case, the tightening and fixing means 13 are provided at two upper and lower positions corresponding to the lap joint structure 20 portion of the yoke forming portion 19 in the iron core 11, and the space between these two fixing and fixing means 13 is supported. An intermediate strut portion 35 is provided. As shown in FIG. 13, the intermediate strut portion 35 has a columnar shape, and male screw portions 35 a and 35 b are formed at both upper and lower end portions thereof.

  Although not shown, a short cylindrical receiving portion 36 having a female screw portion is fixed to the central portion of the lower surface of the clamp plate 22 corresponding to the male screw portion 35a on the upper portion of the intermediate support column 35. A short cylindrical receiving portion 38 having a female screw portion 37 is fixed to the central portion of the upper surface of the clamp plate 22 corresponding to the male screw portion 35 b below the intermediate support column 35. Each nut 27 of the upper and lower fastening means 13 is fixed to the corresponding clamp plate 22 in advance.

  In this case, when assembling a structure in which the intermediate strut portion 35 is provided between the two upper and lower fastening means 13, for example, the following is performed. First, the male thread portions 35a and 35b at both upper and lower end portions of the intermediate strut portion 35 are screwed into the female thread portions 37 of the receiving portions 36 and 38 of the clamp plate 22 in the upper and lower tightening fixing means 13 so Two clamp plates 22 are connected to the part.

  When three sets of U-shaped iron core units 14, 15, and 16 equipped with the coil 12 are combined, two sets of clamp plates 22 are connected to the upper and lower end portions of the intermediate strut portion 35. It is set as the state arrange | positioned in the center part of U-shaped iron core unit 14,15,16 (refer FIG. 14). Thereafter, the upper clamping and fixing means 13 is assembled to the clamp plate 22 connected to the upper side of the intermediate column part 35, and the lower clamp and fixed to the clamp plate 22 connected to the lower side of the intermediate column part 35. The means 13 is assembled. As a result, as shown in FIG. 10, the upper and lower lap joint structure 20 portions are fastened and fixed by the upper and lower tightening fixing means 13, and the space between these tightening fixing means 13 is supported by the intermediate strut portion 35. Can do.

In such a configuration, the iron core 11 can be further strengthened, and as a result, the transformer 10 can be further strengthened.
In the above-described embodiment, the upper and lower male threaded portions 35a and 35b of the intermediate strut portion 35 and the female threaded portions 37 of the receiving portions 36 and 38 may be provided as necessary. The receiving parts 36 and 38 should just be able to be fitted.

(Other embodiments)
The U-shaped iron core units 14, 15, and 16 constituting the iron core 11 are not limited to the four-layered U-shaped iron cores 17, and the U-shaped iron cores 17 are stacked in two, three, or five or more layers. You can also
The static induction device is not limited to the transformer 10 and can be applied to a reactor.

  As described above, according to this embodiment, while taking advantage of the conventional Y-shaped iron core, it is possible to suppress the increase in magnetic flux leakage and iron loss, which are the problems of the conventional Y-shaped iron core, as much as possible. A static induction device having a strong iron core can be provided.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 10 is a transformer (stationary induction device), 11 is an iron core, 12 is a coil, 13 is a fastening means, 14, 15 and 16 are U-shaped iron core units, 17 is a U-shaped iron core, and 18 is a leg formation. Part, 19 is a yoke forming part, 20 is a lap joint structure, 22 is a clamp plate, 23 is a support part, 25 is a cylindrical member, 26 is a bolt, 27 is a nut, 28 is a corner part, 30 and 31 are cylindrical members, 32 Is a cylindrical member, 35 is an intermediate strut portion, and 36 and 38 are receiving portions.

Claims (4)

One leg forming part and three U-shaped iron cores having a substantially U shape having yoke forming parts at both ends of the leg forming part are arranged at approximately 120 degrees around the predetermined point. In such a state, one layer is formed by abutting the yoke forming portions together, and the leg forming portion and the yoke forming portion are formed by stacking a plurality of the U-shaped iron cores, and the second and subsequent layers from the inside are formed. A part of the yoke forming part of one U-shaped core is configured to sequentially overlap the yoke forming part of the U-shaped core of the previous layer that forms another leg forming part different from the one U-shaped core. An iron core for stationary induction equipment having a lap joint structure,
Coils provided in the three leg forming portions of the iron core;
Tightening fixing means for clamping and fixing the lap joint structure portion of the yoke forming portion between the two opposing clamp plates in the iron core;
A stationary induction device characterized by comprising:   The tightening and fixing means has struts located at three corners formed between the adjacent yoke forming portions, and the two clamp plates are connected to each other by the struts. The stationary induction device according to claim 1, wherein the joining structure portion is fastened and fixed.   The tightening fixing means is provided at two locations corresponding to the lap joint structure portion of the yoke forming portion of the iron core, and an intermediate strut that supports between the two tightening fixing means. The stationary guidance device according to claim 1, further comprising a portion. A method for manufacturing the stationary induction device according to any one of claims 1 to 3,
Three sets of U-shaped core units configured by stacking a plurality of layers of the U-shaped cores are provided, and the three sets of U-shaped core units are in a form in which the tip end sides of the respective yoke forming portions are complicated. The coils formed in an annular shape are attached to the respective leg forming portions of the three sets of U-shaped core units, and then the three sets of U-shaped core units are connected to the other U-shaped core units. The iron core having the lap joint structure is formed in the central portion of the yoke forming portion by being united with the yoke forming portion of the letter-shaped iron core unit, and thereafter, the lap joint structure portion is fastened and fixed. A method of manufacturing a stationary induction device, characterized in that it is clamped and fixed between two opposing clamp plates provided in the means.

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