Iron core structure

Abstract

To provide an iron core structure that suppresses deterioration of no-load characteristics. [Solution] The core structure is a wound core in which a magnetic material is wound in an annular shape, and comprises a wound core having an upper divided core and a lower divided core, a strip-shaped member that tightens the upper divided core and the lower divided core from the periphery while the abutting surfaces of the upper divided core and the abutting surfaces of the lower divided core are brought into contact, and a weight member held by the strip-shaped member. The upper divided core has a plurality of legs extending in the vertical direction and a yoke portion extending in the horizontal direction and connecting the plurality of legs. The lower divided core is arranged vertically opposite to the upper divided core and has a plurality of legs extending in the vertical direction and a connecting portion extending in the horizontal direction and connecting the plurality of legs. The weight member applies force to the upper divided core and the lower divided core in a direction that suppresses thermal deformation of the plurality of legs radially outward.

Description

Technical Field

[0001] The present embodiment of the invention relates to a core structure.

Background Art

[0002] For example, as a core used in a transformer, there is a wound core formed by stacking thin sheet-like silicon steel plates or the like. As one method of assembling the core, there is a manufacturing method in which a core material wound around a mandrel in a substantially rectangular shape is cut at the center in the longitudinal direction to form a split core called a so-called C-cut core, and the cut core is incorporated into a winding. The split core is fixed by tightening the outer peripheral surface with a steel band after being incorporated into the winding.

[0003] Since the magnetic flux passes through this butting surface, vibration is induced and thermal deformation is also made non-uniform. The gap between the butting surfaces is called a gap portion, and the distance between the butting surfaces is called a gap length. In order for the gap length not to differ between the inner peripheral side and the outer peripheral side, the cores are not directly butted against each other, and it is common to interpose, for example, a sheet-like gap material between the gaps.

[0004] For example, Patent Document 1 discloses a reactor device using an amorphous material characterized in that a plurality of wound core units in which a plurality of laminated amorphous materials obtained by laminating a plurality of amorphous ribbon materials cut to a predetermined length are stacked in a plurality of stages are butted at a butting joint portion to be divided into two or more parts.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Steel bands are required to maintain the core shape without loosening, even in the face of expansion and contraction of the wound core during transformer operation and resonance caused by electromagnetic vibrations. If repeated stress is applied to the steel band due to excessive vibration or thermal deformation, the steel band may loosen even if a gap material is in place. As a result, the upper and lower divided cores may shift, which could obstruct the flow of magnetic flux and degrade the no-load characteristics of the core.

[0007] To provide an iron core structure that suppresses deterioration of no-load characteristics. [Means for solving the problem]

[0008] The core structure of this embodiment is a wound core in which a magnetic material is wound in an annular shape, and comprises a wound core having an upper divided core and a lower divided core, a strip-shaped member that tightens the upper divided core and the lower divided core from the periphery while the abutting surfaces of the upper divided core and the abutting surfaces of the lower divided core are abutted together, and a weight member held by the strip-shaped member. The upper divided core has a plurality of legs extending in the vertical direction and a yoke portion extending horizontally and connecting the plurality of legs. The lower divided core is arranged vertically opposite to the upper divided core and has a plurality of legs extending in the vertical direction and a connecting portion extending horizontally and connecting the plurality of legs. The weight member applies force to the upper divided core and the lower divided core in a direction that suppresses the radially outward thermal deformation of the plurality of legs. [Brief explanation of the drawing]

[0009] [Figure 1] Front view showing the schematic configuration of the wound iron core in a stationary state. [Figure 2] Front view showing the schematic configuration of a heat-deformed wound iron core. [Figure 3] Front view showing the schematic configuration of the core structure of the first embodiment in a static state. [Figure 4] Front view showing the schematic configuration of the core structure of the first embodiment during rated operation. [Figure 5] A longitudinal cross-sectional view of the core structure of the first embodiment, shown along the VV line in Figure 3. [Figure 6]Flowchart showing the manufacturing process of the iron core structure of the first embodiment [Figure 7] A longitudinal cross-sectional view (corresponding to Figure 5) showing a modified example of the core structure of the first embodiment. [Figure 8] Front view showing the schematic configuration of the core structure of the second embodiment during rated operation. [Figure 9] Front view showing the schematic configuration of a modified example of the core structure of the second embodiment during rated operation. [Figure 10] Front view showing the schematic configuration of the core structure of the third embodiment during rated operation. [Figure 11] Front view showing the schematic configuration of the core structure of the fourth embodiment during rated operation. [Modes for carrying out the invention]

[0010] The following describes wound cores according to several embodiments with reference to the drawings. In addition, elements that are substantially the same across multiple embodiments are denoted by the same reference numerals, and their descriptions are omitted. Hereinafter, the wound core may simply be referred to as the core.

[0011] (First Embodiment) A first embodiment will be described with reference to Figures 1 to 5. As shown in Figure 1, the core structure 1 comprises a wound core 10 and a strip-shaped member 20. The wound core 10 is formed in an annular shape as a whole. The wound core 10 comprises multiple, in this case two, divided cores 11. The divided cores 11 are formed by winding a steel plate or the like to form an annular shape and then dividing it into two in the vertical direction. Each divided core 11 has a yoke portion 12 and multiple, in this case two leg portions 13. The yoke portion 12 connects the ends of the multiple leg portions 13 on one side. The multiple leg portions 13 are formed extending vertically from the yoke portion 12. The other end faces of the leg portions 13 are the cross-sectional surfaces of the multiple divided cores 11, forming a butt joint surface 14 where the divided cores 11 are joined vertically. The strip-shaped member 20 is formed by shaping a material such as steel into a thin strip, and multiple segmented iron cores 11 are butted together at the joint surfaces 14 to form a ring, which is then crimped from the outer circumference.

[0012] Hereinafter, when it is necessary to distinguish the upper and lower split cores in this specification, the upper split core will be referred to as the upper split core 11a, and the lower split core will be referred to as the lower split core 11b. Also, regarding the yoke portion 12, the leg portion 13, and the mating surface 14, the configuration of the upper split core 11a may be respectively referred to as the yoke portion 12a, the leg portion 13a, and the mating surface 14a, and the configuration of the lower split core 11b may be referred to as the yoke portion 12b, the leg portion 13b, and the mating surface 14b for distinction. When there is no need for distinction, they will be collectively referred to as the split core 11, the yoke portion 12, the leg portion 13, and the mating surface 14. A gap material (not shown) is disposed in the gap G between the mating surfaces 14.

[0013] In this case, the split cores 11a and 11b are formed by bisecting the wound core 10 in the vertical direction. That is, the wound core 10 is split at the vertical center of the leg portion 13. Therefore, the vertical length dimension of the leg portion 13a of the upper split core 11a and the vertical length dimension of the leg portion 13b of the lower split core 11b are set to be the same.

[0014] The belt-like member 20 winds around the split cores 11a and 11b from the outer peripheral side. However, as exaggeratedly shown in FIGS. 1 and 2, tension is particularly applied to the left and right corner portions 121 of the yoke portions 12a and 12b. That is, less tension is applied to the portions other than the corner portions 121 of the yoke portions 12a and 12b and the leg portions 13 than to the corner portions 121.

[0015] When the rated voltage is applied to the wound core 10, iron loss occurs in the core and heat is generated. The iron loss does not occur uniformly throughout the core, but rather a non-uniform loss distribution is observed where the loss density is high on the inner peripheral side of the core and decreases rapidly as it moves to the outer peripheral side. Therefore, the temperature distribution of the wound core 10 also becomes non-uniform. As a result of analyzing the heat distribution and thermal deformation in the operating state of the wound core 10, it was found that the inner peripheral side of the leg portion 13 becomes hotter than the outer peripheral side, and particularly large thermal deformation is observed near the outer peripheral side end portion 141 of the mating surface 14. As shown in FIG. 2, the gap length, which is the vertical length of the gap G during transformer operation, is larger on the outer peripheral side than on the inner peripheral side of the mating surface 14.

[0016] Due to the thermal deformation of the segmented core 11, the strip-shaped member 20 is subjected to large tension in the longitudinal direction. Analysis revealed that stress concentrates on the strip-shaped member 20, particularly at the edge of the outer peripheral end 141 of the abutting surface 14, which acts as a fulcrum. As shown by arrow A in Figure 2, the strip-shaped member 20 is subjected to large stress toward the outer periphery near the outer peripheral end 141 of the abutting surface 14. The stress increases sharply near the abutting surface 14, and it was found that the stress exceeds 350 MPa, especially in the portion facing the gap G. In this state, the yield strength of the material of the strip-shaped member 20 is exceeded, and as a result of the plastic deformation of the strip-shaped member 20, the tightening of the segmented core 11 loosens, and therefore the excitation force of vibration is amplified, causing displacement of the wound core 10 itself, which may lead to a significant deterioration of the no-load characteristics.

[0017] As shown in Figures 3 to 5, the core structure 1 of this embodiment is equipped with a thermal deformation suppression mechanism 30. The thermal deformation suppression mechanism 30 has the function of suppressing thermal deformation of the wound core 10 during the operation of the transformer, in particular, thermal deformation that causes the outer peripheral end 141 of the abutting surface 14 to protrude outwards. In other words, as shown in Figure 4, the thermal deformation suppression mechanism 30 suppresses the gap length between the abutting surfaces 14 from becoming longer on the outer peripheral side than on the inner peripheral side due to thermal deformation during operation. As a result, stress concentration on the strip-shaped member 20 at the outer peripheral end 141 is alleviated, plastic deformation of the strip-shaped member 20 is suppressed, and consequently, loosening of the tightening of the strip-shaped member 20 and the resulting displacement of the wound core 10 and deterioration of the no-load characteristics can be suppressed.

[0018] The thermal deformation suppression mechanism 30 comprises a weight member 31, a support member 32, and a protective member 33. The weight member 31 is made of a non-magnetic material having a specific gravity heavier than water. For example, the weight member 31 can be made of stainless steel (SUS), rock such as marble, concrete, brick, etc., but is not limited to these. The support member 32 is fixed to the strip-shaped member 20 and supports the weight member 31. That is, the support member 32 has the function of connecting the weight member 31 and the strip-shaped member 20. The protective member 33 is made of a non-magnetic material such as wood or paper and has a recessed portion 331 at its top that receives the weight member 31. Note that the bottom surface 332 of the recessed portion 331 and the bottom surface 311 of the weight member 31 are not in contact.

[0019] As shown in Fig. 5, in the present embodiment, the weight member 31 is suspended vertically downward from the yoke portion 12a of the upper split core 11a. That is, the support member 32 that supports the weight member 31 is attached to the central portion in the left - right direction of the yoke portion 12a. The support member 32 can be fastened to the belt - shaped member 20 by fasteners such as bolts and nuts. The weight member 31 is disposed at the center in the left - right direction within the space S inside the annular structure of the wound core 10.

[0020] Due to the action of the gravity acting on the weight member 31, the thermal deformation of the leg portions 13 so as to open outward is suppressed. That is, the gravity acting on the weight member 31 acts on the belt - shaped member 20 via the support member 32, and the split core 11 supports the gravity applied to the belt - shaped member 20. In this case, a vertically downward force acts on the upper split core 11a via the belt - shaped member 20. As a result, the gap G between the butting surfaces 14a and 14b becomes smaller. As shown by the arrow B in Fig. 3, the leg portions 13a and 13b exert forces on each other in the vertical direction at the butting surfaces 14a and 14b, more precisely via the sheet material. As a result, the static friction force and the dynamic friction force generated at the butting surfaces 14a and 14b and the sheet material increase, suppressing the thermal deformation of the leg portions 13 to the outer peripheral side. Thereby, as shown in Fig. 4, even if the split core 11 undergoes thermal deformation under rated operation, since the outer peripheral side end portion 141 is unlikely to contact the belt - shaped member 20, it is suppressed that the outer peripheral side end portion 141 becomes a fulcrum and an excessive stress is generated in the belt - shaped member 20.

[0021] Referring to Figure 6, the manufacturing method of the wound core 10 will be described. First, in step S1, the worker winds a steel plate into a ring shape multiple times. In step S2, the worker impregnates the ring-shaped wound steel plate with resin. In step S3, the worker divides the ring-shaped wound steel plate into two vertical sections to form a divided core 11. In step S4, the worker incorporates the legs 13 of the divided core 11 into a winding wire (not shown). In step S5, the worker wraps the outer circumference of the two joined divided cores 11 with a strip-shaped member. In step S6, the worker fixes the weight member 31 to the strip-shaped member 20 using a support member 32 and a fastener weight member. In this way, the wound core 10 is manufactured.

[0022] The core structure 1 of this embodiment described above comprises a wound core 10, a strip-shaped member 20, and a weight member 31. The wound core 10 is a wound core 10 in which a magnetic material is wound in an annular shape, and has an upper divided core 11a and a lower divided core 11b. The upper divided core 11a has a plurality of legs 13, 13a extending in the vertical direction and yoke portions 12, 12a extending in the horizontal direction and connecting the plurality of legs. The lower divided core 11b is arranged vertically opposite to the upper divided core 11a and has a plurality of legs 13, 13b extending in the vertical direction and yoke portions 12, 12b extending in the horizontal direction and connecting the plurality of legs. The strip-shaped member 20 tightens the upper and lower divided cores 11a and 11b from the periphery, with the abutting surfaces 14, 14a of the upper divided core 11a and the abutting surfaces 14, 14b of the lower divided core 11b being brought into contact. The weight member 31 is held by the strip-shaped member 20. The weight member 31 applies force to the upper divided core 11a and the lower divided core 1b in a direction that suppresses the radially outward thermal deformation of the multiple legs 13a, 13b.

[0023] According to this, the degree of radially outward thermal deformation of the leg portion 13 that occurs during the operation of the stationary induction equipment is suppressed, and excessive tension is prevented from being applied to the strip-shaped member 20 near the abutting surface 14. As a result, plastic deformation of the strip-shaped member 20 and, consequently, loosening of the tightening of the divided core 11 can be suppressed. Therefore, a core structure 1 is provided that suppresses displacement of the wound core 10 and suppresses deterioration of the no-load characteristics of the wound core 10.

[0024] The weight member 31 applies a vertical downward force to the yoke portion 12a of the upper divided iron core 11a.

[0025] As a result, a vertical force is applied between the opposing legs 13a and 13b, shortening the gap length between the abutting surfaces 14 of the upper and lower divided cores 11a and 11b. Therefore, the static friction and kinetic friction forces acting between the abutting surfaces 14 during the operation of the stationary induction equipment increase, making it more difficult for the legs 3a and 13b to deform radially outward. Thus, thermal deformation of the legs 13a and 13b, and consequently the stress on the strip-shaped member 20 at the outer peripheral end 141 of the abutting surface 14, can be suppressed, and loosening of the strip-shaped member 20 can be prevented.

[0026] The core structure 1 includes a support member 32 that fixes a weight member 31 to the strip-shaped member 20. The support member 32 is fixed to the strip-shaped member 20 at a position opposite the yoke portion 12a of the upper divided core 11a. The weight member 31 hangs down by the support member 32 below the yoke portion 12a of the upper divided core 11a and above the yoke portion 12b of the lower divided core 11b.

[0027] As a result, the gravitational force of the weight member 31 acting on the yoke portion 12a brings the abutting surfaces 14 closer together, shortening the gap length. Therefore, thermal deformation of the leg portions 13a and 13b, and consequently the stress on the strip-shaped member 20 at the outer peripheral end 141 of the abutting surfaces 14, can be suppressed, and loosening of the strip-shaped member 20 can be prevented.

[0028] In the example of this embodiment shown in Figure 4, the support member 32 passes around the outer circumference of the strip-shaped member 20 and the yoke portion 12a, extends to the weight member 31 without merging below the yoke portion 12a, and both ends of the support member 32 are connected to the weight member 31, but it is not limited to this configuration. As a modified example of this embodiment, as shown in Figure 7, the support member 32 may be configured to pass around the outer circumference of the strip-shaped member 20 and the yoke portion 12a, merge below the yoke portion 12a, and extend to the connection point with the weight member 31. In yet another modified example, the weight member 31 may not hang down from the strip-shaped member 20 and the yoke portion 12 by the support member 32, but may be fixed on top of the yoke portion 12a of the upper divided core 11a. That is, the weight member 31 is placed above the yoke portion 12a, and in that state, the strip-shaped member 20 may be wrapped around the divided cores 11a and 11b together with the weight member 31 from the outside. The same effects as described above can be obtained with these configurations as well.

[0029] (Second Embodiment) A second embodiment will be described with reference to Figure 8. In this embodiment, the thermal deformation suppression mechanism 40 of the wound core 10 suppresses thermal deformation of the legs 13a and 13b by applying a radially inward force to the portion of the strip-shaped member 20 that faces the legs 13a and 13b.

[0030] The thermal deformation suppression mechanism 40 includes a weight member 41, one or more support members 42 (in this case, two), and a protective member 43. The support members 42 are fixed to the strip-shaped member 20 and support the weight member 31. That is, the support members 42 have the function of connecting the weight member 41 and the strip-shaped member 20. The protective member 43 has a recessed portion 431 at its upper part to receive the weight member 41. Note that the bottom surface 432 of the recessed portion 431 and the lower surface portion 411 of the weight member 41 are not in contact.

[0031] The support member 42 is composed of a first fixing portion 421, a second fixing portion 422, and an extension portion 423. The first fixing portion 421 is fixed to a first position 21 of the strip-shaped member 20. The first position 21 is located slightly above the abutting surface 14 of the leg portion 13 of the upper split core 11a. The second fixing portion 422 is fixed to a second position 22 of the strip-shaped member 20. The second position 22 is located slightly below the abutting surface 14 of the leg portion 13 of the lower split core 11b. The extension portion 423 is the portion that extends from the first fixing portion 421 or the second fixing portion 422 toward the connection portion with the weight member 41.

[0032] The position of the first fixing part 421 is set above the abutting surface 14 of the leg part 13a within a range of 1 / 2 or less, preferably 1 / 3, and more preferably 1 / 4, of the vertical length dimension of the leg part 13a. The position of the second fixing part 422 is set below the abutting surface 14 of the leg part 13b within a range of 1 / 2 or less, preferably 1 / 3, and more preferably 1 / 4, of the vertical length dimension of the leg part 13b. In other words, the first fixing part 421 and the second fixing part 422 are the parts where a large stress is applied to the strip-shaped member 20 when thermal deformation occurs in the divided iron core 11a and 11b.

[0033] The support members 42 extend from the outer circumference of the legs 13a and 13b toward the radial center of the wound core 10. That is, the weight member 41 is pulled in the left-right direction by the left and right support members 42. The left-right length of each support member 42 is longer than half the left-right length of the wound core 10, and the support members 42 are inclined to extend downward as they approach the radial center of the wound core 10. In this embodiment, the support members 42 are in contact with the upper corner of the recessed portion 431 of the protective member 43, and are inclined to extend further downward from the portion in contact with the corner toward the portion connected to the weight member 41.

[0034] The core structure 1 of this embodiment includes a support member 42 that fixes the weight member 41 to the strip-shaped member 20. The support member 42 is fixed to the strip-shaped member 20 at at least two positions that vertically sandwich the lower end surface, i.e., the abutting surface 14, of the leg portion 13 of the upper divided core 11a and the upper end surface, i.e., the abutting surface 14, of the leg portion 13 of the lower divided core 11b, and extends radially inward of the wound core 10.

[0035] As a result, the weight member 41 fixed to the strip-shaped member 20 via the support member 42 constantly receives an external force radially inward on the legs 13a and 13b, thereby suppressing thermal deformation during operation of the stationary induction equipment. Furthermore, in the vicinity of the abutting surfaces 14a and 14b, where large thermal deformation is particularly likely to occur, the thermal deformation can be effectively suppressed by pulling radially inward, which is the opposite direction to the protrusion caused by thermal deformation. Therefore, plastic deformation of the strip-shaped member 20, and consequently loosening of the tightening of the divided core 11, can be suppressed, and a core structure 1 is provided that suppresses displacement of the wound core 10 and deterioration of the no-load characteristics of the wound core 10.

[0036] A modified example of this embodiment is shown in Figure 9. In the modified example, the thermal deformation suppression mechanism 40 has two weight members 41 if there are multiple units. The two weight members 41 are arranged side by side in the left-right direction. The left weight member 41 is connected to a support member 42 that extends to the right in this case from the left leg portion 13 toward the radial center of the wound core 10. The right weight member 41 is connected to a support member 42 that extends to the left in this case from the right leg portion 13 toward the radial center of the wound core 10. Even in this configuration, thermal deformation can be suppressed by directly pulling the strip-shaped member 20 radially inward, which is the direction opposite to the protrusion direction due to thermal deformation, at a position opposite to the leg portion 13, where particularly large thermal deformation is likely to occur.

[0037] In this case, the weight member 41 can be placed between the windings that make up the coil (not shown). Numerous duct pieces that form a cooling duct are placed between the windings. The weight member 41 may be placed between the windings in place of some of the duct pieces.

[0038] (Third embodiment) A third embodiment will be described with reference to Figure 10. The thermal deformation suppression mechanism 50 of this embodiment is composed of a weight member 51, a support member 52, and a protective member 53. The support member 52 is fixed to the strip-shaped member 20 and supports the weight member 51. That is, the support member 52 has the function of connecting the weight member 51 and the strip-shaped member 20. The protective member 53 has a recessed portion 531 at its upper part that receives the weight member 51. Note that the bottom surface 532 of the recessed portion 531 and the lower surface portion 511 of the weight member 51 are not in contact.

[0039] In this embodiment, the wound core 10 is divided above the center of the vertical length dimension of the leg portion 13. That is, the abutting surfaces 14a and 14b are positioned close to the yoke portion 12a of the upper divided core 11a and far from the yoke portion 12b of the lower divided core 11b. In this case, the ratio of the length dimension of the leg portion 13a of the upper divided core 11a to the length dimension of the lower divided core 11b can be set within a range of, for example, 1:2 to 1:5.

[0040] In this case, the thermal deformation in the outer circumferential direction caused by the operation of the stationary induction equipment is greater at the abutting surface 14b of the leg portion 13b, which has a longer vertical length dimension, than at the abutting surface 14a of the leg portion 13a. Therefore, the thermal deformation suppression mechanism 50 is configured to suppress thermal deformation at least in the vicinity of the abutting surface 14b of the leg portion 13b. The support member 52 has a fixed portion 521 and an extended portion 522. The fixed portion 521 is fixed to the third position 23 of the strip-shaped member 20. The third position 23 is a position opposite to the abutting surface 14 of the leg portion 13b of the lower split core 11b, slightly below it. In this case, the third position 23 is located above the vertical center of the wound core 10. The extended portion 522 is the portion that extends from the fixed portion 521 toward the connection with the weight member 51. In other words, in this case, the weight member 51 pulls the third position 23 of the strip-shaped member 20 in the left-right direction via the support member 52, thereby suppressing outward expansion near the abutting surface 1414b where thermal deformation is particularly large.

[0041] The thermal deformation suppression mechanism 50 may also include a second support member 54. In this case, the second support member 52 is fixed to the strip-shaped member 20 at a position opposite to the yoke portion 12a of the upper split core 11a. For example, the second support member 54 may be fixed to the strip-shaped member 20 at a position opposite to the left-right center of the yoke portion 12a and hang down from the yoke portion 12a. The lower end of the second support member 54 is connected to a weight member 51. In this case, the weight member 51 pulls the upper split core 11a downward, thereby reducing the gap length between the abutting surface 14a of the upper split core 11a and the abutting surface 14b of the lower split core 11b, and exerting a frictional force to suppress outward thermal deformation of the legs 13a and 13b.

[0042] The core structure 1 of this embodiment includes a support member 52 that fixes the weight member 51 to the strip-shaped member 20. The abutting surface 14a of the upper divided core 11a and the abutting surface 14b of the lower divided core 11b are located off-center from the vertical center of the wound core 10. The support member 52 is fixed to the strip-shaped member 20 at a position facing the leg portion 13 of the divided core 11 which has a longer vertical length than at least the upper divided core 11a and the lower divided core 11b, and extends radially inward from the wound core 10.

[0043] According to this, the weight member 51 fixed to the strip-shaped member 20 via the support member 52 constantly receives an external force directed radially inward on the leg portion 13, thereby suppressing thermal deformation during operation of the stationary induction equipment. Furthermore, by shifting the cutting position of the wound core 10 in the vertical direction, it is sufficient to pull at least the leg portion 13 of the segmented core 11, which experiences significant thermal deformation, radially inward, thus simplifying the configuration.

[0044] The abutting surface 14a of the upper divided core 11a and the abutting surface 14b of the lower divided core 11b are located above the vertical center of the wound core 10. The support member 52 is fixed to the strip-shaped member 20 at a position opposite the leg portion 13b of the lower divided core 11b, below the abutting surface 14b and above the vertical center of the wound core 10, and extends radially inward of the wound core 10.

[0045] According to this, the mounting position of the weight member 51 can be set above the center of the upper wound core 10, making it easier to position the support member 52 while avoiding the coil wound around the leg portion 13. Furthermore, since the mounting position of the weight member 51 can be set higher, the space for positioning the weight member 51 in the space S surrounded by the wound core 10 becomes larger, increasing the degree of freedom in positioning.

[0046] (Fourth Embodiment) A fourth embodiment will be described with reference to Figure 11. The core structure 1 of this embodiment is composed of a weight member 61, a support member 62, and a protective member 63. The support member 62 is fixed to the strip-shaped member 20 and supports the weight member 61. That is, the support member 62 has the function of connecting the weight member 61 and the strip-shaped member 20. The protective member 63 has a recessed portion 631 at its upper part that receives the weight member 61. Note that the bottom surface 632 of the recessed portion 631 and the lower surface portion 611 of the weight member 61 are not in contact.

[0047] In this embodiment, the wound core 10 is divided below the center of the vertical length dimension of the leg portion 13. That is, the abutting surfaces 14a and 14b are positioned close to the yoke portion 12b of the lower divided core 11b and far from the yoke portion 12a of the upper divided core 11a. In this case, the ratio of the length dimension of the leg portion 13b of the lower divided core 11b to the length dimension of the upper divided core 11a can be set within a range of, for example, 1:2 to 1:5.

[0048] In this case, the thermal deformation in the outer circumferential direction caused by the operation of the stationary induction equipment is greater at the abutting surface 14a of the leg portion 13a, which has a longer vertical length, than at the abutting surface 14b of the leg portion 13b, which has a shorter vertical length. Therefore, the thermal deformation suppression mechanism 60 is configured to suppress thermal deformation at least in the vicinity of the abutting surface 14a of the leg portion 13a. The support member 62 has a fixed portion 621 and an extended portion 622. The fixed portion 621 is fixed to the fourth position 24 of the strip-shaped member 20. The fourth position 24 is a position opposite to the portion slightly above the abutting surface 14a of the leg portion 13a of the upper split core 11a. In this case, the fourth position 24 is located below the vertical center of the wound core 10. The extended portion 622 is a portion that extends from the fixed portion 621 toward the connection portion with the weight member 61. In other words, in this case, the weight member 61 pulls the fourth position 24 of the strip-shaped member 20 in the left-right direction via the support member 62, thereby suppressing outward expansion near the abutting surfaces 14, 14a where thermal deformation is particularly large.

[0049] According to the core structure 1 of this embodiment, the abutting surface 14a of the upper divided core 11a and the abutting surface 14b of the lower divided core 11b are located off-center below the vertical center of the wound core 10. The support member 62 is fixed to the strip-shaped member 20 at a position opposite the leg portion 13a of the upper divided core 11a, above the abutting surface 14a and below the vertical center of the wound core 10, and extends radially inward of the wound core 10.

[0050] This embodiment also achieves the same effects as the above embodiment. Furthermore, since the thermal deformation suppression mechanism 60 can be positioned closer to the bottom of the space S inside the wound core 10, the space S can be used more effectively.

[0051] Although several embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0052] 1...Core structure, 10...Wound core, 11...Split core, 11a...Upper split core, 11b...Lower split core, 13,13a,13b...Legs, 14,14a,14b...Butt joints, 20...Strip-shaped members, 31,41,51,61...Weight members, 32,42,52,62...Support members

Claims

1. A wound core in which a magnetic material is wound in a ring shape, comprising an upper divided core and a lower divided core, A strip-shaped member that fastens the upper and lower divided cores together from the surrounding area while the abutting surfaces of the upper divided core and the abutting surfaces of the lower divided core are brought into contact, The strip-shaped member comprises a weight member held by the strip-shaped member, The aforementioned upper divided core has a plurality of legs extending in the vertical direction and a yoke portion extending horizontally and connecting the plurality of legs, The lower divided core is arranged vertically opposite to the upper divided core and has a plurality of legs extending vertically and a connecting portion extending horizontally that connects the plurality of legs. The weight member applies a force to the upper and lower divided cores in a direction that suppresses the radially outward thermal deformation of the plurality of legs. Iron core structure.

2. The weight member is provided with a support member for fixing it to the strip-shaped member, The support member is fixed to the position of the upper divided core of the strip-shaped member opposite to the yoke portion, The weight member is suspended by the support member below the yoke portion of the upper divided core and above the yoke portion of the lower divided core. The core structure according to claim 1.

3. The weight member is provided with a support member for fixing it to the strip-shaped member, The support member is fixed to the strip-shaped member at at least two positions that vertically sandwich the abutting surface of the upper divided core and the abutting surface of the lower divided core, and extends radially inward from the wound core. The core structure according to claim 1.

4. The weight member is provided with a support member for fixing it to the strip-shaped member, The abutting surfaces of the upper divided core and the abutting surfaces of the lower divided core are located off-center from the vertical center of the wound core. The support member is fixed to the strip-shaped member at a position opposite to the leg portion of at least the longer vertically-oriented split core among the upper and lower split cores, and extends radially inward from the wound core. The core structure according to claim 1.

5. The abutting surfaces of the upper divided core and the abutting surfaces of the lower divided core are located above the vertical center of the wound core. The support member is fixed to the strip-shaped member at a position opposite to the leg portion of the lower divided core, below the abutting surface and above the vertical center of the wound core, and extends radially inward from the wound core. The core structure according to claim 4.

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