JP6450100B2 - Wound core - Google Patents

Description

  Embodiments of the present invention relate to a wound core around which a plurality of core members are wound.

  Conventionally, a wound core formed by winding a plurality of core members has been considered.

JP 2005-286169 A

By the way, in this type of wound core, since the corner portion is bent, internal stress is generated in the corner portion due to compositional deformation and elastic deformation due to bending. Therefore, the power loss in the corner portion, so-called “iron loss” increases, and there arises a problem that the temperature of the corner portion and its peripheral portion easily rises.
Therefore, the present embodiment provides a wound iron core that can suppress a temperature rise in the corner portion and its peripheral portion.

The wound iron core according to the present embodiment includes an iron core main body around which a plurality of iron core materials are wound. The core body is divided into a plurality of core blocks along the stacking direction of the cores. Each of the iron core blocks has a different bending angle at the corner portion and a different number of bent portions at the corner portion .

The perspective view which shows one structural example of the wound iron core which concerns on 1st Embodiment. The perspective view which shows one structural example of the wound core with which the coil was assembled | attached Plan view showing one configuration example of a wound core The perspective view which shows the state which manufactures a wound iron core combining several iron core material blocks (A) is a figure which expands and shows the iron core material with a large bending angle of a corner part, (b) is a figure which expands and shows the iron core material with a small bending angle of a corner part. (A) is a top view which shows one structural example of the wound iron core which concerns on 2nd Embodiment, (b) is a top view which shows one structural example of the wound iron core which concerns on a comparative example. FIG. 3 equivalent diagram according to the third embodiment FIG. 1 equivalent view according to the fourth embodiment FIG. 1 equivalent diagram according to the fifth embodiment

Hereinafter, a plurality of embodiments relating to a wound core will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the substantially same element in each embodiment, and description is abbreviate | omitted.
(First embodiment)
A wound iron core 10 illustrated in FIG. 1 is composed of a plurality of iron core materials obtained by cutting a metal plate such as a silicon steel plate. The wound core 10 constitutes the core body 11 by winding a plurality of core members. The wound core 10 has a substantially rectangular window 12 at the center of the core body 11. The wound core 10 includes four corner portions 13 and four side portions 14 that connect between the corner portions 13. As illustrated in FIG. 2, a coil 15 is assembled to the side portion 14, whereby the wound core 10 is used as an iron core such as a transformer.

  As illustrated in FIG. 3, the core body 11 is divided into a plurality of core blocks 11A, 11B, 11C, and 11D along the stacking direction of the cores. Each iron core block 11A, 11B, 11C, 11D has a corner portion 13A, 13B, 13C, 13D, respectively. And corner part 13A of iron core block 11A, corner part 13B of iron core block 11B, corner part 13C of iron core block 11C, and corner part 13D of iron core block 11D, corner part of winding core 10 whole 13 is configured.

  Then, the bending angle α1 of the iron core material at the corner portion 13A of the iron core block 11A, the bending angle α2 of the iron core material at the corner portion 13B of the iron core block 11B, and the bending angle of the iron core material at the corner portion 13C of the iron core block 11C. α3 and the bending angle α4 of the iron core material at the corner portion 13D of the iron core material block 11D are set at different angles.

  That is, the bending angle α1 of the iron core material at the corner portion 13A of the iron core material block 11A arranged on the innermost side of the iron core main body 11 is set to 22.5 ° in this case. That is, in the iron core block 11A, there are four places where the iron core material is bent in one corner portion 13A, and the bending angle α1 of the iron core material at each bent place is 22.5 °. Therefore, the total value of the bending angle of the iron core material in one corner portion 13A of the iron core block 11A is 90 °.

  In this case, the bending angle α2 of the iron core material at the corner portion 13B of the iron core material block 11B adjacent to the outside of the iron core material block 11A is set to 30 °. That is, in the iron core block 11B, there are three places where the iron core material is bent in one corner portion 13B, and the bending angle α2 of the iron core material at each bent place is 30 °. Therefore, the total value of the bending angle of the iron core material in one corner portion 13B of the iron core material block 11B is 90 °.

  In this case, the bending angle α3 of the iron core material at the corner portion 13C of the iron core material block 11C adjacent to the outside of the iron core material block 11B is set to 45 °. That is, in the iron core block 11C, there are two places where the iron core material is bent in one corner portion 13C, and the bending angle α3 of the iron core material at each bent place is 45 °. Therefore, in the iron core block 11C, the total value of the bending angle of the iron core at one corner portion 13C is 90 °.

  In this case, the bending angle α4 of the iron core material at the corner portion 13D of the iron core material block 11D arranged on the outermost side of the iron core body portion 11 is set to 90 °. Has been. That is, in the iron core block 11D, there is one bent portion of the iron core material in one corner portion 13D, and the bending angle α4 of the iron core material at the one bent portion is 90 °. Therefore, in the iron core block 11D, the total bending angle of the iron core material in one corner portion 13D is 90 °.

  In this manner, the wound core 10 is bent from the iron core material block 11A arranged on the innermost side to the iron core material block 11D arranged on the outermost side at the corner portions 13A to 13D of the iron core material blocks 11A to 11D. The angles α1 to α4 are increased. Further, each of the iron core material blocks 11A to 11D is set so that the total value of the bending angle of the iron core material in one corner portion 13A to 13D is 90 °.

  Moreover, the wound iron core 10 is the structure by which the annealing process is performed to the iron core material block 11D arrange | positioned in the outermost side in this case. The annealing treatment is a treatment for relieving the residual stress generated in the iron core material and restoring the iron loss characteristics. Specifically, after the iron core material is heated to a predetermined temperature such as about 800 ° C., for example. This is a cooling process.

  Next, an example of a method for manufacturing the wound core 10 will be described. That is, as illustrated in FIG. 4, first, each iron core block 11 </ b> A to 11 </ b> D is individually created. Each core block 11A to 11D is formed by winding a predetermined number of cores. The number of iron core materials forming each of the iron core material blocks 11A to 11D may be the same or different. That is, the thickness dimension of each of the iron core material blocks 11A to 11D, in other words, the dimension along the stacking direction of the iron core material may all be the same or different. Then, the iron core block 11B is assembled outside the iron core block 11A, the iron core block 11C is assembled outside the iron core block 11B, and the iron core block 11D is assembled outside the iron core block 11C. Thus, the wound core 10 is manufactured by combining the iron core blocks 11A to 11D. In addition, the assembly order of each iron core material block 11A-11D can be changed suitably, and can be implemented.

  According to the wound core 10 according to the present embodiment, the core body 11 is divided into a plurality of core blocks 11A to 11D along the stacking direction of the cores. And iron core material block 11A-11D differs in bending angle (alpha) 1- (alpha) 4 of the iron core material in corner part 13A-13D, respectively. According to this configuration, between the corner portions 13A and 13B of the adjacent iron core blocks 11A and 11B, between the corner portions 13B and 13C of the iron core blocks 11B and 11C, and between the corner portions 13C and 13D of the iron core blocks 11C and 11D. Each gap is formed. Therefore, the heat generated in the corner portion 13 can be released from this gap, and the temperature rise in the corner portion 13 and its peripheral portion can be suppressed.

  Moreover, according to the wound iron core 10, the clearance gaps formed between the corner portions 13A to 13D of the iron core block 11A to 11D can be used as passages for flowing a cooling medium such as air or oil. Thereby, the temperature rise in the corner part 13 and its peripheral part can be suppressed further. Furthermore, the wound iron core 10 is preferably used by being placed horizontally, that is, with the gap extending in the vertical direction. As a result, the cooling medium flows through the gaps between the corner portions 13A to 13D without stagnation, and the cooling efficiency can be further improved.

  Further, according to the wound core 10, the iron core material is bent at the corner portions 13 </ b> A to 13 </ b> D of the iron core material blocks 11 </ b> A to 11 </ b> D from the innermost iron core block 11 </ b> A to the outermost iron core block 11 </ b> D. The angles α1 to α4 are increased. That is, according to the wound core 10, the iron core material block arranged on the inner side has a larger number of bending of the iron core material in the corner portion, and the peripheral length of the iron core material is shorter. Further, according to the wound core 10, the iron core material block arranged on the outer side has a smaller number of bending of the iron core material in the corner portion, and the peripheral length of the iron core material is longer.

  Here, in this type of wound iron core, the greater the number of bent iron core materials, the greater the magnetic resistance, and the shorter the length of the iron core material, the smaller the magnetic resistance. Therefore, according to the wound core 10, in the inner core block, the increase in magnetic resistance due to the large number of bending of the core in the corner portion can be offset by the short circumference of the core. Further, according to the wound core 10, in the outer core block, the increase in magnetic resistance due to the peripheral length of the core can be offset by the small number of folding of the core in the corner portion. Thereby, the magnetic resistance of each iron core material block 11A-11D can be made into the substantially same magnitude | size.

  Therefore, according to the wound core 10, the difference between the magnetic resistance of the iron core block arranged on the inner side and the magnetic resistance of the iron core block arranged on the outer side can be suppressed, and the distribution of magnetic flux can be reduced in the stacking direction of the iron core. Can be made uniform. In general, in this type of wound core, the inner core material tends to concentrate magnetic flux, and therefore the iron loss tends to increase. According to the wound core 10 according to the present embodiment, the magnetic resistance can be made uniform from the inner side to the outer side, and the inner magnetic resistance can be suppressed from becoming higher than the outer magnetic resistance. Therefore, an increase in iron loss in the inner iron core material can be suppressed, and as a result, an increase in heat generation in the inner iron core material can be suppressed.

  Moreover, as illustrated in FIG. 5A, the greater the bending angle at the corner portion of the iron core material, the easier the magnetic flux B leaks from the iron core material. Then, when the magnetic flux B leaks from the iron core material and when the leaked magnetic flux B enters the iron core material again, eddy currents are generated in the surface portions Sa and Sb of the iron core material. Therefore, the greater the bending angle of the iron core material, the greater the loss at the bent portion. Moreover, in a wound iron core, since the full length becomes short, the iron core material arrange | positioned inside has a tendency for magnetic flux to concentrate and become strong. For this reason, the leakage of magnetic flux increases as the iron core material is arranged on the inner side. Therefore, the loss due to eddy current also increases. Therefore, in the wound core 10 according to the present embodiment, as shown in FIG. 5 (b), the iron core block arranged on the inner side, that is, the iron core block in which the total length of the iron core is short and the magnetic flux is easily concentrated is larger. The bending angle at the part is set small. Therefore, it is difficult for magnetic flux to leak from the iron core material, and as a result, loss due to eddy current can be suppressed.

  Moreover, according to the wound core 10, the annealing process is performed at least on the iron core block 11D arranged on the outermost side. Therefore, the magnetic resistance of the iron core block 11D is relaxed, and the magnetic flux that tends to concentrate on the inner iron core can be guided to the outer iron core. Therefore, it is possible to prevent the magnetic flux from concentrating on the inner side of the wound core 10, to avoid that the heat generation source is biased toward the inner side, and to release heat while dispersing the heat from the entire wound core 10. Can do. In addition, the wound iron core 10 is good also as a structure which performed the annealing process also to the iron core material block arrange | positioned inside iron core material block 11D, for example, iron core material block 11C. Moreover, the wound core 10 is good also as a structure which does not give annealing treatment to the iron core material block 11D arrange | positioned on the outermost side.

(Second Embodiment)
The wound iron core 20 illustrated in FIG. 6A is an embodiment in which the bending angles of a plurality of bent portions in one corner portion of the iron core block are different from each other. That is, the wound core 20 has the core body 21 divided into a plurality of core blocks 21A and 21B along the stacking direction of the cores. Each iron core block 21A, 21B has a corner portion 23A, 23B, respectively, and the corner portion 23 of the whole wound core 20 is constituted by these corner portions 23A, 23B. In the iron core block 21A disposed on the inner side, the two bending angles α and β in one corner portion 23A are set to different angles, in this case, 30 ° and 60 °.

  Also in this configuration, the total value of the bending angles α and β of the iron core material in one corner portion 23A is 90 °. That is, the wound iron core 20 has a configuration in which different angles are combined within a range in which the bending angle of the iron core material in one corner portion 23 is 90 ° in total. In this case, in the wound iron core 20, the bending angle β at the side portion 24 side where the coil 25 is assembled is set to 60 °, and the bending angle α at the side portion 24 side where the coil 25 is not assembled is set. Is set to 30 °. That is, in the wound core 20, the bending angle β at the side portion 24 side where the coil 25 is assembled is larger than the bending angle α at the side portion 24 side where the coil 25 is not assembled. Is set.

  According to this configuration, the length L1 of the side portion 24 to which the coil 25 is assembled is set to the side portion in the configuration shown in FIG. 6B, that is, the configuration in which the bending angle γ at the bending portion in one corner portion is the same. Can be secured longer than the length L2. Thereby, according to the wound iron core 20, the larger coil 25 can be assembled | attached.

  The bending angles α and β are not limited to the combination of 30 ° and 60 °, and can be implemented by appropriately changing the combination, for example, 15 ° and 75 °. In addition, when the number of bent portions of the iron core material in one corner portion is three, for example, a combination pattern of bending angles such as setting 15 °, 15 °, and 60 ° as a combination of bending angles. Can be implemented with appropriate changes.

(Third embodiment)
In the wound core 30 illustrated in FIG. 7, the core body 31 is divided into a plurality of core blocks 31 </ b> A to 31 </ b> D along the stacking direction of the cores. Each iron core block 31A to 31D has corner portions 33A to 33D, respectively, and the corner portion 33 of the entire wound core 30 is constituted by the corner portions 33A to 33D. And as for iron core material block 31A arrange | positioned innermost, the corner part 33A has become circular arc shape. That is, the corner portion 33A of the iron core block 31A is not bent. According to this configuration, since the iron core block 31A is not bent, it is possible to suppress the occurrence of local loss at the inner bending point of the wound iron core 30, and from the inner iron core block 31A where the magnetic flux tends to concentrate. Can suppress heat generation.

(Fourth embodiment)
In the wound core 40 illustrated in FIG. 8, the core body 41 is divided into a plurality of core blocks 41 </ b> A to 41 </ b> D along the stacking direction of the cores. Each iron core block 41A-41D has corner parts 43A-43D, respectively, and the corner part 43 of the wound core 40 whole is comprised by these corner parts 43A-43D. And the wound iron core 40 is the structure which provided the thermal radiation block 48 in the clearance gap formed between the corner parts 43C and 43D of adjacent iron core block 41C, 41D, ie, the clearance gap formed largest.

  The heat radiating block 48 is an example of a heat radiating portion, and is made of a material having excellent thermal conductivity such as copper. The heat dissipation block 48 is formed in a block shape so as to fill the entire gap between the corner portions 43C and 43D. The heat dissipation block 48 is in contact with the outer surface of the corner portion 43C of the iron core block 41C and the inner surface of the corner portion 43D of the iron core block 41D.

According to this configuration, heat generated in the corner portion 43C of the iron core block 41C and the corner portion 43D of the iron core block 41D can be released while being transmitted to the heat dissipation block 48. Thereby, the temperature rise in the corner part 43 of the wound iron core 40 and its peripheral part can be suppressed further. Further, since the heat dissipation block 48 fills the entire gap between the corner portions 43C and 43D of the iron core blocks 41C and 41D, it occurs particularly in the corner portion 43C of the iron core block 41C and the corner portion 43D of the iron core block 41D. Heat is easily transmitted to the heat dissipation block 48. Accordingly, the heat radiation efficiency of the corner portion 43 of the wound core 40 and its peripheral portion, in other words, the cooling efficiency is significantly improved.
Note that the wound iron core 40 may have a configuration in which a heat dissipation block is provided in a gap between the corner portions 43A and 43B of the iron core block 41A and 41B and a gap between the corner portions 43B and 43C of the iron core block 41B and 41C.

(Fifth embodiment)
In the wound core 50 illustrated in FIG. 9, the core body 51 is divided into a plurality of core blocks 51 </ b> A to 51 </ b> D along the stacking direction of the cores. Each iron core block 51A to 51D has corner portions 53A to 53D, respectively, and the corner portion 53 of the entire wound core 50 is constituted by these corner portions 53A to 53D. Then, the wound core 50 is replaced with the heat radiating pipe 58 in place of the heat radiating block 48 described above in the gap formed between the corner portions 53C and 53D of the adjacent iron core blocks 51C and 51D, that is, the largest gap formed. Is provided.

  The heat radiating pipe 58 is an example of a heat radiating portion, and is made of a material having excellent thermal conductivity such as copper. The heat radiating pipe 58 is disposed so as to penetrate the gap between the corner portions 53C and 53D. Further, the heat radiation pipe 58 is in contact with the outer surface of the corner portion 53C of the iron core block 51C and the inner surface of the corner portion 53D of the iron core block 51D. A cooling medium such as air or oil flows through the heat radiating pipe 58.

According to this configuration, the heat generated in the corner portion 53C of the iron core block 51C and the corner portion 53D of the iron core block 51D can be released while being transmitted to the cooling medium flowing through the heat radiating conduit 58. Thereby, the temperature rise in the corner part 53 of the wound iron core 50 and its peripheral part can be suppressed further. Further, since the cooling medium flows without stagnation through the heat radiation pipe 58, heat generated at the corner portion 53C of the iron core block 51C and the corner portion 53D of the iron core block 51D is easily released. Therefore, the heat radiation efficiency of the corner portion 53 of the wound core 50 and its peripheral portion, in other words, the cooling efficiency is significantly improved.
In addition, the wound iron core 50 may be configured such that a heat radiating pipe line is also provided in the gap between the corner portions 53A and 53B of the iron core block 51A and 51B and the gap between the corner portions 53B and 53C of the iron core block 51B and 51C.

  The wound core according to the embodiment described above includes an iron core main body around which a plurality of iron core materials are wound. The core body is divided into a plurality of core blocks along the stacking direction of the cores. Each iron core block differs in the bending angle of the iron core at the corner. According to this configuration, a gap is formed in the corner portion, and a heat dissipation action by the gap is realized, so that temperature rise in the corner portion and its peripheral portion can be suppressed.

  This embodiment is presented as an example and is 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. This embodiment and its modifications 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 wound iron core, 11 is an iron core body, 11A to 11D are iron core blocks, 13, 13A to 13D are corner parts, 20 is a wound iron core, 21 is an iron core body, 21A and 21B are iron core blocks, 23, 23A, 23B are corner portions, 30 is a wound core, 31 is a core body, 31A to 31D are core blocks, 33, 33A to 33D are corners, 40 is a wound core, 41 is an iron core, 41A to 41D is an iron core block, 43 and 43A to 43D are corner portions, 48 is a heat dissipation block (heat dissipation portion), 50 is a wound iron core, 51 is an iron core body, 51A to 51D are iron core blocks, and 53, 53A to 53D are corners Reference numeral 58 denotes a heat radiation pipe line (heat radiation portion).

Claims (6)

It has an iron core main body wound with multiple iron core materials,
The iron core main body is divided into a plurality of iron core material blocks along the lamination direction of the iron core material,
Each of the core blocks is a wound core in which the bending angle in the corner portion is different and the number of bent portions in the corner portion is different .   The wound iron core according to claim 1, wherein the bending angle of each iron core block increases from the iron core block located on the inner side to the iron core block located on the outer side.   The wound core according to claim 1 or 2, wherein the iron core block is set so that a total value of the bending angles at one corner portion is 90 °.   The wound core according to any one of claims 1 to 3, wherein the innermost core block has an arcuate corner portion.   5. The wound core according to claim 1, wherein the outermost core block is annealed. 6.   The wound core according to any one of claims 1 to 5, wherein a heat radiating portion is provided in a gap formed between the adjacent core blocks.

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