Core body, reactor, and method for manufacturing reactor

Abstract

The present invention provides a core body, a reactor and a method for manufacturing the reactor. The core body, the reactor and a method for manufacturing the reactor are lightweight and can be manufactured at low cost without increasing losses or enlarging the size. The reactor (6) includes a core body: the core body (5) includes an outer peripheral iron core (20) and at least three iron cores (41 to 44) joined to the inner surface of the outer peripheral iron core, gaps (101 to 104) that enable magnetic coupling are formed between adjacent iron cores of the at least three iron cores, and a plurality of notches (24a to 27a, 71 to 74) extending along the axial direction of the outer peripheral iron core are formed on the outer peripheral surface of the outer peripheral iron core.

Description

Technical Field

[0001] The present invention relates to a core body including an outer peripheral iron core, a reactor including such a core body, and a manufacturing method. Background Art

[0002] In recent years, a reactor has been developed that includes a core body including an outer peripheral iron core and a plurality of iron cores disposed inside the outer peripheral iron core. Coils are wound around each of the plurality of iron cores.

[0003] When setting the core body, the core body is arranged between two core fixing parts, such as end plates and / or bases, and metal bolts are inserted into multiple through holes formed in the two core fixing parts and the outer peripheral core to fix the core body (for example, refer to Japanese Patent Gazette No. 2019-029449). Summary of the invention

[0004] Problem that the invention aims to solve

[0005] However, since the metal bolt contacts the inner wall of the through hole, that is, the outer peripheral core, a large loop current is generated, resulting in a problem of increased loss. Although this problem can be avoided by insulating the metal bolt, the cost becomes high.

[0006] When the through holes of the peripheral core are removed and the metal bolts are arranged outside the peripheral core, the loss does not increase. However, in this case, the core fixing part is enlarged, resulting in another problem of enlarged reactor. In addition, making the core body and the reactor lightweight is an eternal issue in this technical field.

[0007] Therefore, it is desirable to provide a lightweight core body that can be manufactured at low cost without increasing loss or increasing size, a reactor having such a core body, and a manufacturing method.

[0008] Solutions for solving problems

[0009] According to the first technical solution, a reactor is provided, which includes a core body, the core body includes an outer peripheral iron core, and at least three iron core coils joined to the inner surface of the outer peripheral iron core, the at least three iron core coils include at least three iron cores and coils wound on the iron cores, the radial inner ends of each of the at least three iron cores are located near the center of the outer peripheral iron core and converge toward the center of the outer peripheral iron core, a gap capable of magnetic coupling is formed between one of the at least three iron cores and other iron cores adjacent to the one iron core, the radial inner ends of the at least three iron cores are separated from each other by the gap capable of magnetic coupling, and a plurality of notches extending along the axial direction of the outer peripheral iron core are formed on the outer peripheral surface of the outer peripheral iron core, the reactor also includes: two core fixing parts, which are respectively arranged on the two end surfaces of the outer peripheral iron core; and a plurality of bolts, which pass through the plurality of notches, sandwich the core body between the two core fixing parts and fix the core body.

[0010] According to a second technical solution, in the first technical solution, the plurality of bolts are formed of a magnetic material.

[0011] According to a third technical solution, in the first or second technical solution, the outer peripheral core is composed of a plurality of outer peripheral core parts, and the at least three cores are respectively joined to each of the plurality of outer peripheral core parts.

[0012] According to the fourth technical solution, in the third technical solution, the multiple notch portions are formed at at least one of the following positions: a position corresponding to the outer end portion of the outer peripheral surface of the peripheral iron core corresponding to the radial outer end portions of each of the at least three iron cores; a position corresponding to the joint surface corresponding to the joint surfaces of the peripheral iron core portions adjacent to each other among the multiple peripheral iron core portions.

[0013] According to a fifth technical solution, in any one of the first to fourth technical solutions, the number of the at least three core coils is a multiple of three.

[0014] According to a sixth technical solution, in any one of the first to fourth technical solutions, the number of the at least three core coils is an even number greater than or equal to 4.

[0015] According to the seventh technical solution, a core body is provided, which comprises: an outer peripheral iron core, and at least three iron cores joined to the inner surface of the outer peripheral iron core, wherein the radial inner ends of the at least three iron cores are located near the center of the outer peripheral iron core and converge toward the center of the outer peripheral iron core, a gap capable of magnetic coupling is formed between one of the at least three iron cores and other iron cores adjacent to the one core, the radial inner ends of the at least three iron cores are separated from each other by the gap capable of magnetic coupling, and a plurality of notches extending along the axial direction of the outer peripheral iron core are formed on the outer peripheral surface of the outer peripheral iron core.

[0016] According to an eighth technical solution, in the seventh technical solution, the outer peripheral core is composed of a plurality of outer peripheral core parts, and the at least three cores are respectively joined to each of the plurality of outer peripheral core parts.

[0017] According to the 9th technical solution, in the 8th technical solution, the multiple notch portions are formed at at least one of the following positions: a position corresponding to the outer end portion of the outer peripheral surface of the peripheral iron core corresponding to the outer end portions in the radial direction of each of the at least three iron cores; a position corresponding to the joint surface corresponding to the joint surfaces of the peripheral iron core portions adjacent to each other among the multiple peripheral iron core portions.

[0018] According to the tenth technical solution, a method for manufacturing a reactor is provided, and the manufacturing method of the reactor is manufactured according to the following content: preparing a core body, the core body including an outer peripheral iron core, and at least three iron core coils joined to the inner surface of the outer peripheral iron core, the at least three iron core coils including at least three iron cores and coils wound on the iron cores, the radial inner ends of each of the at least three iron cores are located near the center of the outer peripheral iron core and converge toward the center of the outer peripheral iron core, a gap capable of magnetic coupling is formed between one of the at least three iron cores and other iron cores adjacent to the one iron core, the radial inner ends of the at least three iron cores are separated from each other by the gap capable of magnetic coupling, a plurality of notches extending along the axial direction of the outer peripheral iron core are formed on the outer peripheral surface of the outer peripheral iron core, and two iron core fixing parts are arranged on the two end surfaces of the outer peripheral iron core, a plurality of bolts are passed through the plurality of notches, the core body is clamped between the two iron core fixing parts and the core body is fixed.

[0019] Effects of the Invention

[0020] In the first and tenth technical solutions, since the bolts pass through the notch formed in the peripheral iron core, the bolts are arranged inside the footprint of the core body, thereby avoiding the reactor from being enlarged. In addition, since the material cost of the peripheral iron core is reduced, the cost is also reduced. Furthermore, since a plurality of notches are formed in the peripheral iron core, the reactor can also be lightweight.

[0021] In the second technical solution, since bolts made of magnetic material, such as ordinary metal bolts, can be used, it is not necessary to insulate the bolts, so that the reactor can be manufactured at a low cost. Furthermore, since the bolts made of magnetic material passing through the notch do not contact the outer peripheral iron core, the problem of increased loss is avoided.

[0022] In the third aspect, even when the outer peripheral core is large, it can be manufactured easily.

[0023] In the fourth aspect, the notch portion can be formed without affecting the magnetic characteristics of the reactor.

[0024] In the fifth aspect, the reactor can be used as a three-phase reactor.

[0025] In the sixth aspect, the reactor can be used as a single-phase reactor.

[0026] In the seventh aspect, since a plurality of notches are formed in the outer peripheral core, the material cost of the outer peripheral core can be reduced, the cost can be reduced, and the weight of the core body can also be reduced.

[0027] In the eighth aspect, even when the outer peripheral core is large, it can be manufactured easily.

[0028] In the ninth aspect, the notch portion can be formed without affecting the magnetic characteristics of the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The objects, features and advantages of the present invention will become more apparent from the following description of the embodiments in conjunction with the accompanying drawings.

[0030] Figure 1A This is an exploded perspective view of the reactor according to the first embodiment.

[0031] Figure 1B yes Figure 1A A perspective view of the reactor shown.

[0032] Figure 2 This is a cross-sectional view of a core body included in the reactor according to the first embodiment.

[0033] Figure 3AThis is a first diagram showing the magnetic flux density of the reactor.

[0034] Figure 3B This is a second diagram showing the magnetic flux density of the reactor.

[0035] Figure 3C The third diagram shows the magnetic flux density of the reactor.

[0036] Figure 3D The fourth diagram shows the magnetic flux density of the reactor.

[0037] Figure 3E The fifth diagram shows the magnetic flux density of the reactor.

[0038] Figure 3F 3 is a sixth diagram showing the magnetic flux density of the reactor.

[0039] Figure 4A This is a diagram showing the relationship between phase and current.

[0040] Figure 4B This is an end view of the outer core.

[0041] Figure 5A It is a perspective view of a first reactor in the prior art.

[0042] Figure 5B is a perspective view of a second reactor in the prior art.

[0043] Figure 5C It is a partial stereoscopic diagram of another reactor in the prior art.

[0044] Figure 5D yes Figure 5C A partial cross-sectional view of another inductor is shown.

[0045] Figure 6 It is a cross-sectional view of a core body included in the reactor according to the second embodiment. DETAILED DESCRIPTION

[0046] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, corresponding components are denoted by common reference numerals.

[0047] In the following description, a three-phase reactor is mainly used as an example for explanation, but the application of the present disclosure is not limited to the three-phase reactor, but can be widely applied to multi-phase reactors that require a certain inductance in each phase. In addition, the reactor of the present disclosure is not limited to the reactor provided on the primary side and the secondary side of the inverter of an industrial robot or a machine tool, but can be applied to various equipment.

[0048] Figure 1A is an exploded perspective view of the reactor according to the first embodiment, Figure 1B yes Figure 1A A perspective view of the reactor shown. Figure 1A as well as Figure 1B The reactor 6 shown mainly includes: a core body 5, two core fixing parts 60, 81 that clamp the core body 5 in the axial direction and fasten the core body 5, and a fixing part that fastens the above components to each other, such as a bolt 99. In the following description, the two core fixing parts 60, 81 are respectively an end plate 81 and a base 60, but other forms of core fixing parts that can clamp the core body 5 in the axial direction and fasten it can also be used. The end plate 81 extends over the entire edge of the end surface of the outer peripheral core 20 described later of the core body 5 and contacts the outer peripheral core 20.

[0049] Preferably, the end plate 81 and the base 60 are formed of a non-magnetic material such as aluminum, SUS, resin, etc. An opening 69 is formed in the base 60, and the opening 69 has an outer shape suitable for placing the end face of the core body 5. The end plate 81 has an outer shape partially corresponding to the end face of the outer peripheral core 20, and the shape of the opening 89 formed in the end plate 81 is a shape roughly equivalent to the inner peripheral face of the outer peripheral core 20. The opening 69 formed in the base 60 and the opening 89 formed in the end plate 81 are set to be large enough so that the coils 51 to 53 (described later) protrude from the end face of the core body 5. In addition, the height of the base 60 is set to be slightly higher than the protruding height of the coils 51 to 53 protruding from the end face of the core body 5. The notch 65 formed on the lower surface of the base 60 is used to fix the reactor 6 set on the base 60 to a predetermined position. Furthermore, a plurality of through holes 98 are formed at equal intervals in the end plate 81 , and a plurality of through holes 68 are also formed in the upper surface of the base 60 at positions corresponding to the through holes 98 .

[0050] Figure 2 2 is a cross-sectional view of a core body included in the reactor according to the first embodiment. Figure 2 As shown in FIG. 1 , the core body 5 includes an outer peripheral iron core 20 and three iron core coils 31 to 33 that are magnetically coupled to the outer peripheral iron core 20. Figure 2 In the embodiment, core coils 31 to 33 are arranged inside the outer peripheral core 20. These core coils 31 to 33 are arranged at equal intervals in the circumferential direction of the core body 5. In addition, the outer peripheral core 20 may also be a circle or a shape similar to other substantially regular even-sided polygons. In addition, it is preferred that the number of core coils is a multiple of 3, thereby enabling the reactor 6 to be used as a three-phase reactor.

[0051] As can be seen from the drawings, each core coil 31 to 33 includes cores 41 to 43 extending only along the radial direction of the outer peripheral core 20, and coils 51 to 53 wound around the cores. The cores 41 to 43 are surrounded by the outer peripheral core 20. The radial outer ends of each core 41 to 43 are connected to the outer peripheral core 20, or are formed integrally with the outer peripheral core 20. In addition, in some drawings, the coils 51 to 53 are omitted for simplicity.

[0052] exist Figure 2 In the embodiment, the outer peripheral core 20 is composed of a plurality of, for example, three, outer peripheral core portions 24 to 26 divided at equal intervals in the circumferential direction. The outer peripheral core portions 24 to 26 are respectively formed integrally with the cores 41 to 43. In the case where the outer peripheral core 20 is composed of a plurality of outer peripheral core portions 24 to 26, even when the outer peripheral core 20 is large, such an outer peripheral core 20 can be easily manufactured.

[0053] Furthermore, the radial inner ends of the respective iron cores 41 to 43 are located near the center of the outer peripheral iron core 20. In the drawings, the radial inner ends of the respective iron cores 41 to 43 converge toward the center of the outer peripheral iron core 20, and the top angle thereof is about 120 degrees. Furthermore, the radial inner ends of the iron cores 41 to 43 are separated from each other by gaps 101 to 103 that enable magnetic coupling.

[0054] In other words, the radial inner end of the core 41 is separated from the radial inner ends of the two adjacent cores 42 and 43 by gaps 101 and 102. The same is true for the other cores 42 and 43. The gaps 101 to 103 are set to be equal in size.

[0055] As described above, in the present invention, since the central core located in the central part of the core body 5 is not required, the core body 5 can be constructed lightly and simply. Furthermore, since the three core coils 31 to 33 are surrounded by the peripheral core 20, the magnetic field generated by the coils 51 to 53 will not leak to the outside of the peripheral core 20. In addition, since the gaps 101 to 103 can be provided at any thickness at low cost, it is advantageous in design compared to the reactor of the conventional structure.

[0056] Furthermore, the core body 5 of the present invention has a smaller difference in magnetic path length between phases than a conventional reactor. Therefore, the present invention can also reduce the inductance imbalance caused by the difference in magnetic path length.

[0057] In addition, by Figure 1A , Figure 1B as well as Figure 2It can be seen that the notches 24a to 24c, 25a to 25c, and 26a to 26c are formed on the outer peripheral surfaces of the outer peripheral core parts 24 to 26, respectively. The notches 24a, 25a, and 26a are formed at the center of the outer peripheral surfaces of the outer peripheral core parts 24 to 26. In other words, the notches 24a, 25a, and 26a are formed at positions corresponding to the outer ends of the outer peripheral surface of the outer peripheral core 20 corresponding to the outer radial ends 41a to 43a of the respective cores 41 to 43. The cross-sections of the notches 24a, 25a, and 26a in the axial direction of the core body 5 are roughly triangular, but may also be other shapes.

[0058] Furthermore, notches 24b and 24c are formed on the outer peripheral surface of the outer peripheral core portion 24. The notches 24b and 24c are formed at positions corresponding to the joint surfaces corresponding to the joint surfaces where the outer peripheral core portion 24 is joined to the outer peripheral core portions 25 and 26. The outer peripheral core portions 25 and 26 are also respectively formed with similar notches 25b and 25c and notches 26b and 26c.

[0059] like Figure 2 As shown, the notch 24b of the outer peripheral core portion 24 and the notch 25c of the outer peripheral core portion 25 adjacent to each other form a common notch 71. Similarly, the notches 25b and 26c adjacent to each other form a common notch 72, and the notches 26b and 24c adjacent to each other form a common notch 73. The cross-section of the common notches 71 to 73 in the axial direction of the core body 5 is semicircular, but it can also be other shapes, and the notches 24a, 25a, 26a and the common notches 71 to 73 can also be the same shape.

[0060] After the coils 51 to 53 are wound around the iron cores 41 to 43, the outer peripheral core portions 24 to 26 are assembled to produce the outer peripheral core 20. Figure 1A As known, one end of the peripheral core 20 on which the coils 51 to 53 are wound is placed on the base 60, and the end plate 81 is arranged on the other end of the core body 5. And when a plurality of bolts 99 are inserted into the through-holes 98 of the end plate 81, the shafts of the plurality of bolts 99 pass through the notch portions 24a to 26a and the common notch portions 71 to 73, respectively. And the top ends of the plurality of bolts 99 are threadedly engaged with the through-holes 68 of the base 60. Thus, the peripheral core 20 can be firmly fixed between the end plate 81 and the base 60. For this purpose, thread teeth may also be formed on the inner circumferential surface of the through-hole 68 and / or the through-hole 98.

[0061] As described above, in the first embodiment of the present invention, since the bolts 99 pass through the notches 24a to 26a and the common notches 71 to 73 formed in the outer peripheral core 20, the bolts 99 are arranged inside the footprint of the core body 5, thereby avoiding the reactor 6 from being enlarged. In addition, since the material cost of the outer peripheral core 20 is reduced, the cost is also reduced. Furthermore, since a plurality of notches 24a to 26a and the common notches 71 to 73 are formed in the outer peripheral core 20, the reactor 6 can also be made lighter. In addition, only one of the notches 24a to 26a and the common notches 71 to 73 may be formed. In this case, the same effect can be achieved with a simple structure.

[0062] also, Figure 3A to Figure 3F is a diagram showing the magnetic flux density of a reactor without a notch. Figure 4A is a graph showing the relationship between phase and current, Figure 4B This is an end view of the outer core. Figure 4A In the embodiment, the cores 41 to 43 of the reactor 6 are respectively set to the R phase, the S phase, and the T phase. Figure 4A , the current of the R phase is represented by a dotted line, the current of the S phase is represented by a solid line, and the current of the T phase is represented by a dashed line.

[0063] exist Figure 4A When the electrical angle is π / 6, we get Figure 3A The magnetic flux density is shown in Figure 2. Similarly, when the electrical angle is π / 3, we get Figure 3B The magnetic flux density shown, when the electrical angle is π / 2, is obtained Figure 3C The magnetic flux density shown, when the electrical angle is 2π / 3, is obtained Figure 3D The magnetic flux density shown, when the electrical angle is 5π / 6, is obtained Figure 3E The magnetic flux density shown, when the electrical angle is π, is obtained Figure 3F The magnetic flux density is shown.

[0064] By reference Figure 3A to Figure 3F as well as Figure 2As can be seen, the magnetic flux density of the outer end corresponding positions P1 to P3 (corresponding to the positions of the notches 24a to 26a) of the outer peripheral surface of the outer peripheral core 20 corresponding to the radial outer ends 41a to 43a of the respective cores 41 to 43 is smaller than the magnetic flux density of the remaining portion of the outer peripheral core 20. The reason is that it is difficult for the magnetic flux to pass through the outer end corresponding positions P1 to P3. Similarly, the magnetic flux density of the joint surface corresponding positions PA to PC (corresponding to the positions of the common notches 71 to 73) corresponding to the joint surfaces of the adjacent outer peripheral core parts 24 to 26 is smaller than the magnetic flux density of the remaining portion of the outer peripheral core 20. Therefore, it is preferable to form the notches 24a to 26a and the common notches 71 to 73 at the outer end corresponding positions P1 to P3 and the joint surface corresponding positions PA to PC. In this case, the influence on the magnetic characteristics of the reactor 6 can be suppressed, and the aforementioned effect can be achieved. The same also applies to the case where one of the notch portions 24 a to 26 a and the common notch portions 71 to 73 is formed.

[0065] Figure 5A is a three-dimensional diagram of a first reactor of the prior art. Figure 5A The outer peripheral core 20 ′ of the reactor 6 ′ shown in the figure is not formed with the notches 24 a to 26 a and the common notches 71 to 73 . Figure 5B to Figure 5D The same is true for the reactor shown. Figure 5A In the embodiment, since a plurality of bolts 99 are arranged outside the outer peripheral core 20, the end plate 81 is large enough to accommodate the plurality of bolts 99. Figure 5A The reactor 6' shown becomes Figure 1B The reactor 6 shown is large-sized.

[0066] Figure 5B It is a perspective view of a second reactor of the prior art. The shafts of the plurality of bolts 99 are surrounded by an insulator, such as an insulating tube 95. Furthermore, the plurality of bolts 99 are inserted into through holes formed in the outer peripheral iron core 20'. In this case, an insulator is additionally required, which increases the manufacturing cost of the reactor 6".

[0067] In contrast, in the present invention, since the bolts 99 are arranged inside the footprint of the core body 5 as described above, the reactor 6 is prevented from being enlarged. Figure 1B The position of the bolt 99 shown is Figure 5A The bolt 99 shown is located near the center of the core body 5. Therefore, in the present invention, the core body 5 can be more firmly fixed between the end plate 81 and the base 60. Furthermore, since there is no need to prepare an insulator (insulating tube 95) separately, and the material cost of the outer peripheral core 20 is reduced by the amount corresponding to the notches 24a to 26a and the common notches 71 to 73, the reactor 6 can be manufactured at a low cost.

[0068] Here, Figure 5C is a partial stereogram of another reactor in the prior art. Figure 5D yes Figure 5C A partial cross-sectional view of another reactor is shown in FIG. Figure 5C In the embodiment, bolts 99 are inserted into the through holes formed in the outer peripheral core portion 24'. Figure 5C as well as Figure 5D As shown, the peripheral core portion 24' and the core 41' are formed by laminating a plurality of magnetic plates such as iron plates, carbon steel plates, and electromagnetic steel plates, or by using a powdered iron core. This also applies to the peripheral core portions 24 to 26 of the present invention.

[0069] When Figure 5C When the reactor shown is energized, the magnetic flux Figure 5C The result is that if Figure 5D As shown, small loop eddy currents IE are generated in each of the plurality of magnetic plates 29. Since the bolts 99 are in contact with the outer peripheral core portion 24, these eddy currents IE generate large loop currents IL, which cause losses.

[0070] In the present invention, the radial distance L1 from the outer peripheral surface of the outer peripheral core 20 to the farthest parts of the notches 24a, 25a, 26a and the common notches 71 to 73 is larger than the diameter of the shaft of the bolt 99. Therefore, the bolt 99 is prevented from contacting the outer peripheral core 20, and as a result, a large loop current is not generated, thereby avoiding an increase in loss. In addition, since the bolt 99 of the present invention can also be a bolt made of a magnetic material, such as a normal metal bolt, it is not necessary to perform insulation treatment on the bolt 99, so that the reactor 6 can be manufactured at a lower cost.

[0071] In addition, if Figure 2 As shown in FIG. 1 , it is preferred that the radial distance L1 of the notches 24a to 26a is less than half of the width L2 of the outer peripheral core 20. The reason is that: Figure 4A As shown, for example, when the current of the R phase is at the vertex A, the currents of the S phase and the T phase are negative, and their magnitudes are half of the magnitude of the current of the R phase at the vertex A. Therefore, if the radial distance L1 is less than half of the width L2 of the outer peripheral core 20, the magnetic characteristics of the reactor 6 are maintained, and the strength of the outer peripheral core 20 is not affected. In addition, this also applies to the common notches 71 to 73.

[0072] Figure 6 It is a cross-sectional view of a core body included in the reactor according to the second embodiment. Figure 6The core body 5 shown includes an outer peripheral iron core 20 having a substantially octagonal cross section, and four iron core coils 31 to 34, which are arranged inside the outer peripheral iron core 20 and are the same as the aforementioned iron core coils. These iron core coils 31 to 34 are arranged at equal intervals in the circumferential direction of the core body 5. In addition, it is preferred that the number of iron cores is an even number of 4 or more, thereby enabling the reactor having the core body 5 to be used as a single-phase reactor.

[0073] As can be seen from the accompanying drawings, the peripheral core 20 is composed of four peripheral core parts 24 to 27 divided in the circumferential direction. Each core coil 31 to 34 includes an iron core 41 to 44 extending only in the radial direction and a coil 51 to 54 wound around the iron core. In addition, the radial outer end of each iron core 41 to 44 is formed integrally with each peripheral core part 24 to 27. In addition, the number of iron cores 41 to 44 and the number of peripheral core parts 24 to 27 may not necessarily be the same. Figure 2 The same is true for the core body 5 shown.

[0074] Furthermore, the radial inner end of each of the iron cores 41 to 44 is located near the center of the outer peripheral iron core 20. Figure 6 In the embodiment, the radial inner ends of the cores 41 to 44 converge toward the center of the outer peripheral core 20, and the tip angle is about 90 degrees. The radial inner ends of the cores 41 to 44 are separated from each other by gaps 101 to 104 that enable magnetic coupling.

[0075] As in the above, the notches 24a, 25a, 26a, 27a are formed at the center of the outer peripheral surface of each of the outer peripheral core parts 24 to 27. Furthermore, the notches 24b and 24c are formed at positions corresponding to the joint surfaces corresponding to the joint surfaces where the outer peripheral core part 24 and the outer peripheral core parts 25 and 27 are joined. The outer peripheral core parts 25, 26 and 27 are also respectively formed with similar notches 25b and 25c, notches 26b and 26c, and notches 27b and 27c. And, as in the above, the notches 24b and 25c adjacent to each other form a common notch 71, the notches 25b and 26c adjacent to each other form a common notch 72, the notches 26b and 27c adjacent to each other form a common notch 73, and the notches 27b and 24c adjacent to each other form a common notch 74. In addition, the radial distance L1 of the notches 24a to 27a is equal to or less than half the width L2 of the outer peripheral core 20. This also applies to the common notches 71 to 74.

[0076] In the second embodiment, the shapes of the end plate 81 and the base 60 are also set to different shapes according to the outer shape of the outer peripheral core 20. And, similarly to the first embodiment, one end of the core body 5 in which the coils 51 to 54 are wound around the cores 41 to 44 is placed on the base 60, and the end plate 81 is arranged on the other end of the core body 5. And, when a plurality of bolts 99 are inserted into the through-hole 98 of the end plate 81, the shafts of the plurality of bolts 99 pass through the notch portions 24a to 27a and the common notch portions 71 to 74, respectively. And, the top ends of the plurality of bolts 99 are threadedly connected to the through-hole 68 of the base 60. Thereby, the core body 5 can be firmly fixed between the end plate 81 and the base 60. Therefore, it can be clearly seen that even in Figure 6 The same effects as those described above can be obtained in the illustrated embodiment as well.

[0077] Furthermore, even if Figure 2 as well as Figure 6 The core body 5 of the coils 51 to 53 (54) shown is also included in the scope of the present invention. In this case, at least one of the notches 24a to 26a (27a) and the common notches 71 to 73 (74) is formed on the outer peripheral surface of the outer peripheral iron core 20. Therefore, it can be seen that the material cost of the outer peripheral iron core 20 can be reduced, the cost can be reduced, and the weight of the core body 5 can also be reduced.

[0078] Although the embodiments of the present invention have been described above, it should be understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the disclosure of the claims.

Claims

1. A reactor, characterized in that: The reactor comprises a core body, The core body includes an outer peripheral iron core and at least three iron core coils joined to the inner surface of the outer peripheral iron core, wherein the at least three iron core coils include at least three iron cores and coils wound around the iron cores. The radial inner end portions of the at least three cores are located near the center of the outer peripheral core and converge toward the center of the outer peripheral core. A gap capable of magnetic coupling is formed between one of the at least three cores and another core adjacent to the one core, and the radial inner ends of the at least three cores are separated from each other by the gap capable of magnetic coupling. A plurality of notches extending along the axial direction of the outer peripheral core are formed on the outer peripheral surface of the outer peripheral core. The reactor also features: Two core fixing parts, which are respectively arranged on the two end surfaces of the outer peripheral core; as well as a plurality of bolts passing through the plurality of notches, sandwiching the core body between the two core fixing parts and fixing the core body, Wherein, the peripheral iron core is composed of a plurality of peripheral iron core parts. The multiple notch portions are formed at at least one of the following positions: a position corresponding to the outer end portion of the outer peripheral surface of the peripheral iron core corresponding to the radial outer end portions of each of the at least three iron cores; and a position corresponding to the joint surface of the adjacent peripheral iron core portions among the multiple peripheral iron core portions.

2. The reactor according to claim 1, characterized in that: The plurality of bolts are formed of a magnetic material.

3. The reactor according to claim 1, characterized in that: The at least three cores are respectively joined to the plurality of peripheral core parts. The two core fixing parts are an end plate and a base respectively.

4. The reactor according to claim 2, characterized in that: The at least three cores are respectively joined to the plurality of peripheral core parts. The two core fixing parts are an end plate and a base respectively.

5. The reactor according to any one of claims 1 to 4, characterized in that: The number of the at least three iron core coils is a multiple of 3.

6. The reactor according to any one of claims 1 to 4, characterized in that: The number of the at least three core coils is an even number greater than 4.

7. A core body, characterized in that: The core body has: an outer peripheral core; and at least three iron cores joined to the inner surface of the outer peripheral iron core, The radial inner end portions of the at least three cores are located near the center of the outer peripheral core and converge toward the center of the outer peripheral core. A gap capable of magnetic coupling is formed between one of the at least three cores and another core adjacent to the one core, and the radial inner ends of the at least three cores are separated from each other by the gap capable of magnetic coupling. A plurality of notches extending along the axial direction of the outer peripheral core are formed on the outer peripheral surface of the outer peripheral core. Wherein, the peripheral iron core is composed of a plurality of peripheral iron core parts. The multiple notch portions are formed at at least one of the following positions: a position corresponding to the outer end portion of the outer peripheral surface of the peripheral iron core corresponding to the radial outer end portions of each of the at least three iron cores; and a position corresponding to the joint surface of the adjacent peripheral iron core portions among the multiple peripheral iron core portions.

8. The core body according to claim 7, characterized in that The at least three cores are respectively joined to the plurality of peripheral core parts. The two core fixing parts respectively arranged at both end surfaces of the outer peripheral core are an end plate and a base.

9. A method for manufacturing a reactor, characterized in that: The manufacturing method of the reactor is manufactured according to the following contents: Prepare the core body, The core body includes an outer peripheral iron core and at least three iron core coils joined to the inner surface of the outer peripheral iron core, wherein the at least three iron core coils include at least three iron cores and coils wound around the iron cores. The radial inner end portions of the at least three cores are located near the center of the outer peripheral core and converge toward the center of the outer peripheral core. A gap capable of magnetic coupling is formed between one of the at least three cores and another core adjacent to the one core, and the radial inner ends of the at least three cores are separated from each other by the gap capable of magnetic coupling. A plurality of notches extending along the axial direction of the outer peripheral core are formed on the outer peripheral surface of the outer peripheral core. Furthermore, Two core fixing parts are arranged on both end surfaces of the outer peripheral core. Passing a plurality of bolts through the plurality of notches, sandwiching the core body between the two core fixing parts, and fixing the core body. Wherein, the peripheral iron core is composed of a plurality of peripheral iron core parts. The multiple notch portions are formed at at least one of the following positions: a position corresponding to the outer end portion of the outer peripheral surface of the peripheral iron core corresponding to the radial outer end portions of each of the at least three iron cores; and a position corresponding to the joint surface of the adjacent peripheral iron core portions among the multiple peripheral iron core portions.

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