WO2021141029A1

WO2021141029A1 - Reactor including outer peripheral core and multiple cores, and core assembly

Info

Publication number: WO2021141029A1
Application number: PCT/JP2021/000123
Authority: WO
Inventors: 雅朋白水
Original assignee: ファナック株式会社
Priority date: 2020-01-09
Filing date: 2021-01-05
Publication date: 2021-07-15

Abstract

The present invention prevents the generation of magnetic distortion sound without increasing iron loss. A reactor (6) comprises an outer peripheral core (20) and three core coils (31 to 34). Radially inner ends of the cores (101 to 104) of the core coils are spaced apart from each other with magnetically couplable gaps therebetween. The outer peripheral core (20) is formed by laminating a plurality of magnetic plates in a laminating direction. The reactor further comprises a pressurizing member (81) having a plurality of protrusions (82, 84) for locally pressurizing the outer peripheral core in the laminating direction.

Description

Reactor and core assembly containing outer peripheral core and multiple cores

The present invention relates to a reactor and an iron core assembly including an outer peripheral iron core and a plurality of iron cores.

In recent years, a reactor having a core body including an outer peripheral iron core and a plurality of iron cores arranged inside the outer peripheral iron core has been developed. A coil is wound around each of the plurality of iron cores.

Each of the outer peripheral iron core and the plurality of iron cores is formed by laminating a plurality of magnetic plates. Therefore, when the reactor is driven, magnetostrictive sound is generated from the outer peripheral iron core and the plurality of iron cores.

In Reference 1, the vibration reducing portion is arranged at the center of the end face of the reactor, and the plurality of legs of the vibration reducing portion pressurize each of the plurality of iron cores in the stacking direction, thereby suppressing the generation of magnetostrictive sound. ing.

Japanese Unexamined Patent Publication No. 2018-117047

However, since the plurality of legs pressurize each of the plurality of iron cores only in the plurality of legs and their vicinity, the suppression of magnetostrictive sound is also limited to the plurality of legs and their vicinity. In other words, it is difficult to suppress the magnetostrictive sound generated in the outer peripheral iron core only by the plurality of legs of the vibration reducing portion.

Also, since the outer peripheral iron cores are arranged around a plurality of iron cores, the magnetostrictive sound generated by the outer peripheral iron cores is more likely to leak to the outside of the reactor than the magnetostrictive sounds generated by the plurality of iron cores. Therefore, it is particularly required to reduce the magnetostrictive sound generated in the outer peripheral iron core.

Further, it is conceivable to further suppress the magnetostrictive sound by forming through holes in the outer peripheral iron core and / or a plurality of iron cores and tightening the through holes through bolts or the like. However, when through holes are formed in the outer peripheral iron core and / or a plurality of iron cores, the magnetic path is narrowed and iron loss increases.

Such a problem occurs not only in a reactor including an outer peripheral iron core and a plurality of iron cores, but also in a normal reactor composed of two E-type iron core assemblies.

Therefore, a reactor and an iron core assembly capable of sufficiently reducing the generation of magnetostrictive sound without increasing iron loss are desired.

According to the first aspect of the present disclosure, the outer peripheral iron core surrounding the outer circumference and at least three iron core coils in contact with or coupled to the inner surface of the outer peripheral iron core are provided. Each of the three core coils is composed of an iron core and a coil wound around the iron core, and the radial inner ends of each of the at least three iron cores are located near the center of the outer peripheral iron core. Converges toward the center of the outer peripheral core, and there is a magnetically connectable gap between one of the at least three cores and the other core adjacent to the one core. The radial inner ends of the at least three cores are separated from each other via a magnetically connectable gap, and the outer peripheral cores are laminated with a plurality of magnetic plates in a stacking direction. Provided is a reactor further comprising a pressurizing member having a plurality of convex portions that locally pressurize the outer peripheral iron core in the stacking direction.

In the first aspect, the plurality of magnetic plates constituting the outer peripheral iron core are locally pressurized with a higher pressure in the stacking direction of the magnetic plates by the plurality of convex portions of the pressurizing member. Therefore, the magnetostrictive sound of the reactor, particularly the magnetostrictive sound generated in the outer peripheral iron core can be sufficiently reduced. Since the plurality of iron cores are surrounded by the outer peripheral iron cores, it is possible to effectively reduce the magnetostrictive sound generated by the plurality of iron cores from leaking to the outside by reducing the magnetostrictive sound generated by the outer peripheral iron cores. Further, since the pressure can be applied by a strong force by using a plurality of convex portions, it is not necessary to additionally form a through hole, and it is possible to avoid an increase in iron loss.

The object, feature and advantage of the present invention will be further clarified by the description of the following embodiments related to the accompanying drawings.

It is an exploded perspective view of the reactor based on the first embodiment. It is a perspective view of the reactor shown in FIG. 1A. It is sectional drawing of the core body included in the reactor based on 1st Embodiment. It is an exploded perspective view of the outer peripheral iron core. It is a side view of a pressure member. It is a figure which shows the magnetic flux density of the reactor shown in FIG. 1B. It is sectional drawing of the core body included in another reactor based on 1st Embodiment. It is an exploded perspective view of the reactor based on the second embodiment. It is a perspective view of the reactor shown in FIG. 7A. It is sectional drawing of the core body included in the reactor based on 2nd Embodiment. It is sectional drawing of the core body included in another reactor based on 2nd Embodiment. It is a partial decomposition perspective view of the reactor based on an additional embodiment. It is a perspective view of the reactor based on an additional embodiment. It is sectional drawing of the reactor of E core. It is a cross-sectional view of the iron core assembly in the present disclosure, and corresponds to the cross-sectional view taken along the line AA of FIG. It is a cross-sectional view of another iron core assembly in the present disclosure, and corresponds to the cross-sectional view taken along the line AA of FIG. It is the first perspective view of the iron core assembly in this disclosure. It is the first perspective view of the iron core assembly in this disclosure. It is a figure which shows the magnetic flux density of the reactor including the iron core assembly of this disclosure. It is a figure which shows the modification of the 1st Embodiment. It is a figure which shows the other modification of the 1st Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. A common reference code is attached to the corresponding components throughout the drawings.
In the following description, a three-phase reactor will be mainly described as an example, but the application of the present disclosure is not limited to the three-phase reactor, and can be widely applied to a multi-phase reactor that requires a constant inductance in each phase. is there. Further, the reactor according to the present disclosure is not limited to those provided on the primary side and the secondary side of the inverter in an industrial robot or a machine tool, and can be applied to various devices.

FIG. 1A is an exploded perspective view of the reactor based on the first embodiment, and FIG. 1B is a perspective view of the reactor shown in FIG. 1A. The reactor 6 shown in FIGS. 1A and 1B mainly includes a core body 5, a pressure member 81 and a pedestal 60 that sandwich the core body 5 in the axial direction, and a holding portion for fastening them to each other, for example, a bolt 99. I'm out. The pressurizing member 81 is preferably arranged in a region between the outer peripheral surface and the inner peripheral surface of the outer peripheral iron core 20 on the end surface of the core main body 5.

The pressure member 81 and the pedestal 60 can be formed of iron, a non-magnetic material, for example, aluminum, SUS, resin, or the like. Although there are no particular restrictions, it is desirable that the pressurizing member 81 and the pedestal 60 are made of a highly rigid material in order to reduce the magnetostrictive sound. The pedestal 60 is formed with an opening 69 having an outer shape suitable for mounting the end surface of the core body 5. The pressure member 81 has an outer shape corresponding to the outer peripheral surface of the outer peripheral iron core 20, and the opening 89 formed in the pressure member 81 substantially corresponds to the inner peripheral surface of the outer peripheral iron core 20. The shape. The opening 69 formed in the pedestal 60 and the opening 89 formed in the pressurizing member 81 are assumed to be sufficiently large for the coils 51 to 53 (described later) to protrude from the end faces of the core body 5. Further, the height of the pedestal 60 is slightly higher than the protruding height of the coils 51 to 53 protruding from the end surface of the core main body 5. The notch 65 formed on the lower surface of the pedestal 60 is used to fix the reactor 6 provided on the pedestal 60 in place. Further, a plurality of through holes 98 are formed in the pressure member 81 at equal intervals, and a plurality of through holes 29 are also formed in the outer peripheral iron core 20 at positions corresponding to the through holes 98, and the pedestal 60 is formed. A plurality of through holes 68 are also formed on the upper surface at positions corresponding to the through holes 98. The through hole 68 may be a simple through hole, or the through hole 68 is formed by tapping the through hole, cutting the tap by performing a burring process, or driving a press-fit nut. In the case of a mere through hole, a nut 96 corresponding to the bolt 99 is required for fastening with the bolt 99.

FIG. 2 is a cross-sectional view of the core body included in the reactor based on the first embodiment. As shown in FIG. 2, the core body 5 includes an outer peripheral iron core 20 and three core coils 31 to 33 that are magnetically connected to the outer peripheral iron core 20. In FIG. 2, the iron core coils 31 to 33 are arranged inside the outer peripheral iron core 20. These iron core coils 31 to 33 are arranged at equal intervals in the circumferential direction of the core main body 5. The outer peripheral iron core 20 may have a shape similar to a circular shape or another substantially even-numbered square shape. Further, the number of iron core coils is preferably a multiple of 3, whereby the reactor 6 can be used as a three-phase reactor.

As can be seen from the drawings, each of the iron core coils 31 to 33 includes an iron core 41 to 43 extending only in the radial direction of the outer peripheral iron core 20, and coils 51 to 53 wound around the iron core. The iron cores 41 to 43 are surrounded by the outer peripheral iron core 20. Each of the radial outer ends of the iron cores 41 to 43 is in contact with the outer peripheral iron core 20 or is formed integrally with the outer peripheral iron core 20. In some drawings, the coils 51 to 53 (54) are omitted for the sake of brevity.

In FIG. 2, the outer peripheral iron core 20 is composed of a plurality of, for example, three outer peripheral iron core portions 24 to 26 divided at equal intervals in the circumferential direction. The outer peripheral iron core portions 24 to 26 are integrally formed with the iron cores 41 to 43, respectively. When the outer peripheral iron core 20 is composed of a plurality of outer peripheral iron core portions 24 to 26 in this way, even if the outer peripheral iron core 20 is large, such an outer peripheral iron core 20 can be easily manufactured. it can.

Further, FIG. 3 is an exploded perspective view of the outer peripheral iron core 20. As can be seen from FIG. 3, the outer peripheral iron core 20 is formed by laminating a plurality of magnetic plates 28, for example, an iron plate, a carbon steel plate, and an electromagnetic steel plate. In FIG. 3, a plurality of magnetic plates having a shape corresponding to the outer peripheral iron core portions 24 to 26 are shown. However, the outer peripheral iron core 20 may be formed by laminating a plurality of magnetic plates having a shape corresponding to the outer peripheral iron core 20 and a plurality of magnetic plates having a shape corresponding to the iron cores 41 to 43.

Further, each radial inner end of the iron cores 41 to 43 is located near the center of the outer peripheral iron core 20. In the drawing, the inner end portions of the iron cores 41 to 43 in the radial direction converge toward the center of the outer peripheral iron core 20, and the tip angle thereof is about 120 degrees. The radial inner ends of the iron cores 41 to 43 are separated from each other via magnetically connectable gaps 101 to 103.

In other words, the radial inner ends of the iron core 41 are separated from each other via

gaps

101 and 103 with the radial inner ends of the two

adjacent iron cores

42 and 43, respectively. The same applies to the

other iron cores

42 and 43. The dimensions of the gaps 101 to 103 are assumed to be equal to each other.

As described above, in the present disclosure, since the central iron core located at the central portion of the core main body 5 is not required, the core main body 5 can be constructed lightweight and easily. Further, since the three iron core coils 31 to 33 are surrounded by the outer peripheral iron core 20, the magnetic field generated from the coils 51 to 53 does not leak to the outside of the outer peripheral iron core 20. Further, since the gaps 101 to 103 can be provided with an arbitrary thickness at low cost, it is advantageous in design as compared with the reactor having the conventional structure.

Further, in the core body 5 of the present disclosure, the difference in magnetic path length between the phases is smaller than that of the reactor having the conventional structure. Therefore, in the present disclosure, it is also possible to reduce the imbalance of inductance caused by the difference in magnetic path length.

After winding the coils 51 to 53 around the iron cores 41 to 43, the outer peripheral iron core portions 24 to 26 are assembled with each other to create the outer peripheral iron core 20. Then, as can be seen with reference to FIG. 1A, one end of the outer peripheral iron core 20 is placed on the pedestal 60, and the pressure member 81 is arranged on the other end of the core body 5. Then, when the plurality of bolts 99 are inserted into the through holes 98 of the pressurizing member 81, each of the shaft portions of the plurality of bolts 99 penetrates through the through holes 29 of the outer peripheral iron core 20, and the tips of the plurality of bolts 99 are the pedestals 60. It is screwed into the through hole 68 of. As a result, the outer peripheral iron core 20 can be firmly fixed between the pressure member 81 and the pedestal 60. For this purpose, threads may be formed on the inner peripheral surface of the through hole 68 and / or the through hole 98.

By the way, FIG. 4 is a side view of the pressurizing member. The pressurizing member 81 includes a plurality of projecting portions 82 projecting downward in FIG. 4 and having through holes 29 formed therein, a plurality of curved portions 83 curved upward in FIG. 4, and a plurality of flat portions 84. I'm out. One protrusion 82 is arranged between the two curved portions 83. The one protruding portion 82 and the two curved portions 83 are arranged between the two flat portions 84.

Further, as can be seen from FIG. 1A and the like, the protruding portion 82 is provided in the region of the outer peripheral iron core 20 corresponding to the base ends of the iron cores 41 to 43, and the curved portion 83 is the outer peripheral iron core corresponding to the coils 51 to 53. It is provided in 20 areas. Further, the flat portion 84 is provided in the remaining region of the outer peripheral iron core 20.

The protruding portion 82, the curved portion 83, and the flat portion 84 are preferably formed by bending a plate capable of elastic deformation such as iron or molding it with a resin material capable of elastic deformation. Thereby, the protruding portion 82 and the like can be easily created. Further, the pressurizing member 81 has a shape corresponding to a region between the outer peripheral surface and the inner peripheral surface of the outer peripheral iron core 20.

Therefore, as can be seen from FIG. 1B, the areas of the protruding portion 82 and the curved portion 83 may differ depending on the location where the protruding portion 82 and the curved portion 83 are arranged. In other words, the area of the protruding portion 82 arranged in the region of the outer peripheral iron core 20 corresponding to the base ends of the iron cores 41 to 43 and the two curved portions 83 sandwiching the protruding portion 82 is the remaining area of the outer peripheral iron core 20. It is smaller than the area of the protruding portion 82 arranged in the above and the two curved portions 83 sandwiching the protruding portion 82.

Further, the flat portion 84 is arranged at a position closer to the outer peripheral iron core 20 with respect to the protruding portion 82. In other words, there is a step D between the lower surface of the protruding portion 82 and the lower surface of the flat portion 84 (see FIG. 4).

As described above, the pressurizing member 81 is arranged on the outer peripheral iron core 20, and the outer peripheral iron core 20 is sandwiched between the pressurizing member 81 and the pedestal 60. Then, the pressure is applied using the bolt 99. Since the step D exists, the flat portion 84 of the pressurizing member 81 first contacts the end face of the outer peripheral iron core 20, and then the protruding portion 82 contacts the end face of the outer peripheral iron core 20.

FIG. 5 is a diagram showing the magnetic flux density of the reactor shown in FIG. 1B. When the bolt 99 is screwed and further pressurized, a high pressure region with a high pressing force is formed as shown in black in FIG. In addition, only a part of the high pressure region in FIG. 5 is shown for the purpose of brevity. These high pressure regions are orthogonal to the main magnetic flux passing through the outer peripheral iron core 20. In making the pressure member 81, the high pressure region may be a region connecting the inner peripheral surface and the outer peripheral surface of the outer peripheral iron core 20, and is not necessarily orthogonal to the main magnetic flux. Due to the presence of the step D, the pressurizing member 81 locally provides the outer peripheral iron core 20 at the boundary portion between the protruding portion 82 and the curved portion 83 and the boundary portion between the curved portion 83 and the flat portion 84. Pressurize with higher pressure. Therefore, one bolt 99 (position of the through hole 29) forms four high pressure regions.

In other words, the high pressure region is formed at both ends of the protruding portion 82 and both ends of the flat portion 84 in the circumferential direction of the outer peripheral iron core 20. In the present disclosure, the outer peripheral iron core 20 is locally pressurized by the projecting portion 82 and the flat portion 84, and the pressing force thereof is the pressing force through the washer of the bolt 99 when the pressing member 81 is a flat plate. It is greater than the fixing force.

As described above, the plurality of magnetic plates constituting the outer peripheral iron core 20 are locally pressurized in the stacking direction with a higher pressure by the protruding portion 82 and the flat portion 84. Therefore, the magnetostrictive sound of the reactor 6, particularly the magnetostrictive sound generated at the outer peripheral iron core 20, can be sufficiently reduced. Further, since the iron cores 41 to 43 are arranged inside the outer peripheral iron core 20, it is possible to reduce the leakage of the magnetostrictive sound generated in the iron cores 41 to 43 to the outside. Further, since a plurality of high pressure regions are formed, it is not necessary to form additional through holes, and it is possible to avoid an increase in iron loss.

Then, the pressurizing member 81 is arranged in the entire circumferential direction of the outer peripheral iron core 20. Therefore, since the outer peripheral iron core 20 is pressurized as a whole, the occurrence of magnetostrictive sound can be sufficiently reduced, and as a result, it is not necessary to additionally form a through hole. Therefore, it is possible to avoid an increase in iron loss.

As can be seen by comparing FIGS. 1B and 4, the pressurizing member 81 includes one continuously arranged flat portion 84, one curved portion 83, one protruding portion 82, and the other curved portion 83. It has a plurality of sets, for example, six sets. In an embodiment (not shown), the pressurizing member 81 is composed of a plurality of pressure members 81, for example, six pressurizing member portions 81a to 81f, and one flat portion in which the respective pressurizing member portions 81a to 81f are continuously arranged. It may have 84, one curved portion 83, one protruding portion 82, and the other curved portion 83.

FIG. 6 is a cross-sectional view of the core body included in another reactor based on the first embodiment. The core body 5 shown in FIG. 6 includes a substantially octagonal outer peripheral iron core 20 and four core coils 31 to 34 similar to those described above, which are arranged inside the outer peripheral iron core 20. .. These iron core coils 31 to 34 are arranged at equal intervals in the circumferential direction of the core main body 5. Further, the number of iron cores is preferably an even number of 4 or more, so that a reactor provided with a core body 5 can be used as a single-phase reactor.

As can be seen from the drawing, the outer peripheral iron core 20 is composed of four outer peripheral iron core portions 24 to 27 divided in the circumferential direction. Each of the iron core coils 31 to 34 includes an iron core 41 to 44 extending in the radial direction and coils 51 to 54 wound around the iron core. The radial outer ends of the iron cores 41 to 44 are integrally formed with the outer peripheral iron core portions 21 to 24. The number of iron cores 41 to 44 and the number of outer peripheral iron core portions 24 to 27 do not necessarily have to match.

Further, each radial inner end of the iron cores 41 to 44 is located near the center of the outer peripheral iron core 20. In FIG. 6, each radial inner end of the iron cores 41 to 44 converges toward the center of the outer peripheral iron core 20, and the tip angle thereof is about 90 degrees. The radial inner ends of the iron cores 41 to 44 are separated from each other via magnetically connectable gaps 101 to 104.

Also in this case, the same pressure member 81 as described above, which is arranged in the region between the outer peripheral surface and the inner peripheral surface of the outer peripheral iron core 20, is used. That is, the pressurizing member 81 in the other reactor has a protruding portion 82 in the region of the outer peripheral iron core 20 corresponding to the base ends of the iron cores 41 to 44, and in the region of the outer peripheral iron core 20 corresponding to the coils 51 to 53. It also has a curved portion 83.

As described above, when the outer peripheral iron core 20 is sandwiched between the pressure member 81 and the pedestal 60 and tightened using the bolt 99, the protruding portion 82 and the flat portion 84 form a plurality of magnetic plates forming the outer peripheral iron core 20. Is locally pressurized in the stacking direction at a higher pressure. Therefore, it can be seen that the same effect as described above can be obtained.

FIG. 7A is an exploded perspective view of the reactor based on the second embodiment, FIG. 7B is a perspective view of the reactor shown in FIG. 7A, and FIG. 8 is a core body included in the reactor based on the second embodiment. It is a cross-sectional view. Of the elements in these drawings, the elements already described will be omitted in order to avoid duplication of description.

As can be seen from these drawings, notches 24a to 24c, 25a to 25c, and 26a to 26c are formed on the outer peripheral surfaces of the outer peripheral iron core portions 24 to 26, respectively. The

cutout portions

24a, 25a, and 26a are formed in the center of the outer peripheral surfaces of the outer peripheral iron core portions 24 to 26, respectively. In other words, the

cutout portions

24a, 25a, and 26a are formed at positions corresponding to the outer end portions on the outer peripheral surface of the outer peripheral portion iron core 20 corresponding to the respective radial outer end portions 41a to 43a of the iron cores 41 to 43. The cross sections of the

notches

24a, 25a, and 26a in the axial direction of the core body 5 are substantially triangular, but other shapes may be used.

Further,

notches

24b and 24c are further formed on the outer peripheral surface of the outer peripheral iron core portion 24. The

cutout portions

24b and 24c are formed at positions corresponding to the coupling surfaces corresponding to the coupling surfaces in which the outer peripheral iron core portions 24 are coupled to the outer peripheral

iron core portions

25 and 26.

Similar notches

25b and 25c and

notches

26b and 26c are also formed in the outer peripheral

iron core portions

25 and 26, respectively.

As shown in FIG. 8, the notch 24b of the outer peripheral iron core portion 24 adjacent to each other and the notch 25c of the outer peripheral iron core 25 form a common notch 71 together. 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 cutouts 71 to 73 in the axial direction of the core body 5 is semicircular, but other shapes may be used, and the

cutouts

24a, 25a, 26a and the common cutouts 71 to 73 may have the same shape. Good.

After winding the coils 51 to 53 around the iron cores 41 to 43, the outer peripheral iron core portions 24 to 26 are assembled with each other to create the outer peripheral iron core 20. Then, as can be seen with reference to FIG. 1A, one end of the outer peripheral iron core 20 in which the coils 51 to 53 are wound around the iron cores 41 to 43 is placed on the pedestal 60, and the pressure member 81 is placed on the outer peripheral iron core 20. Place at the other end. Then, when the plurality of bolts 99 are inserted into the through holes 98 of the pressurizing member 81, the shaft portions of the plurality of bolts 99 pass through the notches 24a to 26a and the inside of the common notches 71 to 73, respectively. Then, the tips of the plurality of bolts 99 are screwed into the through holes 68 of the pedestal 60. As a result, the outer peripheral iron core 20 can be firmly fixed between the pressure member 81 and the pedestal 60. For this purpose, threads may be formed on the inner peripheral surface of the through hole 68 and / or the through hole 89.

Also in this case, the plurality of magnetic plates constituting the outer peripheral iron core 20 are locally pressurized in the stacking direction with a higher pressure by the protruding portion 82 and the flat portion 84 of the pressurizing member 81. Therefore, it can be seen that the same effect as described above can be obtained.

Further, in the second embodiment, since the notches 71 to 73 and 24a to 26a are formed, it is possible to eliminate the need to form the through hole 29 in the outer peripheral iron core 20. Therefore, it is possible to further prevent the iron loss from increasing, and it is possible to remove the extra iron core, so that the weight can be reduced.

FIG. 9 is a cross-sectional view of the core body included in another reactor based on the second embodiment. Similar to the above, the

cutout portions

24a, 25a, 26a, 27a are formed in the center of the outer peripheral surfaces of the outer peripheral iron core portions 24 to 27, respectively. Further, the

cutout portions

iron core portions

25 and 27.

Similar notches

25b, 25c,

notches

26b, 26c, and

notches

27b, 27c are also formed in the outer peripheral

iron core portions

25, 26, 27, respectively. Then, as described above, the

notches

24b and 25c adjacent to each other form the common notch 71, the

notches

25b and 26c adjacent to each other form the common notch 72, and the

notches

26b and 26b adjacent to each other form the common notch 72. 27c forms a common notch 73, and

adjacent notches

27b and 24c form a common notch 74. The radial distance L1 of the notches 24a to 27a is less than half the width L2 of the outer peripheral iron core 20. And this also applies to common notches 71-74.

FIG. 10A is a partially decomposed perspective view of the reactor based on the additional embodiment, and FIG. 10B is a perspective view of the reactor based on the additional embodiment. FIG. 10A shows an additional pressurizing member 61 that pressurizes the radial inner ends of the iron cores 41 to 43. The additional pressurizing member 61 includes a plurality of extension portions 61a to 61c extending in the radial direction. The legs 67a to 67c are provided between the two adjacent extension portions 61a to 61c. These legs 67a-67c extend radially outward at a central position between two adjacent extensions. It is assumed that the legs 67a to 67c are integrally formed with the additional pressurizing member 61. Further, additional leg portions 68a to 68c extend perpendicularly to the leg portions 67a to 67c from the tips of the leg portions 67a to 67c.

As can be seen from FIGS. 10A and 10B, the extension portions 61a to 61c of the additional pressurizing member 61 engage with the upper surfaces of the iron cores 41 to 43, and the legs 67a to 67c are inserted into the gaps 101 to 103, respectively. Will be done. In this case, the legs 67a to 67c are arranged between the iron cores 41 to 43.

Next, the bolt 95 is inserted into the central opening of the additional pressurizing member 61, and the nut 96 pressurizes the other end of the reactor 6. In this case, the iron cores 41 to 43 are held in the axial direction (stacking direction) by the additional pressurizing member 61. As described above, it can be seen that the magnetostrictive sound generated from the iron cores 41 to 43 can be suppressed by fixing with the bolt 95 and the nut 96. It will be clear that the additional pressurizing member 61 can be similarly applied in the second embodiment as well.

By the way, FIG. 11 is a cross-sectional view of the E-core reactor. As shown in FIG. 11, the reactor 100 of the E core includes two first

outer legs

151, 152 and a first central leg 153 disposed between these first

outer legs

151, 152. A substantially E-shaped second including a first iron core 150 in a shape and a second central leg 163 arranged between the two second

outer legs

161 and 162 and these second

outer legs

161 and 162. Includes iron core 160 and.

Further, the coil 171 is wound around the first outer leg portion 151 and the second outer leg portion 161. Similarly, the coil 172 is wound around the first outer leg portion 152 and the second outer leg portion 162, and the coil 173 is wound around the first central leg portion 153 and the second central leg portion 163. As shown, between the two first

outer legs

151, 152 of the first core 150 and the two second

outer legs

161, 162 of the second core 160, and between the first central leg 153 and the first. A gap G is formed between the two central legs 163.

FIG. 12A is a cross-sectional view of the iron core assembly, which corresponds to a cross-sectional view taken along line AA of FIG. It is assumed that the iron core assembly 15 includes the first iron core 150 and does not include the coil. The first iron core 150 is formed by laminating a plurality of magnetic plates 28, for example, an iron plate, a carbon steel plate, and an electromagnetic steel plate, and the first iron core 150 can also be referred to as a magnetic plate laminated body 150.

As shown in FIG. 12A, the iron core assembly 15 further includes

pressure members

85 and 86 sandwiching the magnetic plate laminate 150 in between. Then, the magnetic plate laminate 150 and the

pressure members

85 and 86 are tightened in the stacking direction by the bolts 99 and nuts inserted into the through holes.

As shown, a plurality of spacers 87 are arranged between the pressure member 85 and the magnetic plate laminate 150 and between the pressure member 86 and the magnetic plate laminate 150. The spacer 87 may be integrally formed with the

pressure members

85 and 86. These spacers 87 pressurize the plurality of magnetic plates 28 at a higher pressure in the stacking direction. Therefore, as described above, the magnetostrictive sound of the E-core reactor 100 including the magnetic plate laminate 150 can be reduced. Further, it is not necessary to additionally form a through hole other than the through hole of the bolt 99, and it is possible to avoid an increase in iron loss.

FIG. 12B is a cross-sectional view of another iron core assembly, and corresponds to a cross-sectional view taken along the line AA of FIG. A plurality of protrusions 88 are integrally formed on each of the

pressure members

85 and 86 of the iron core assembly 15 shown in FIG. 12B. Even in such a case, it is clear that the same effect as described above can be obtained.

FIG. 13A is a first perspective view of the iron core assembly in the present disclosure. The iron core assembly 15 shown in FIG. 13A mainly includes a magnetic plate laminate 150 described with reference to FIG. 11 and two

pressure members

85a and 86a that pressurize the magnetic plate laminate 150 in the lamination direction. I'm out. Further, the iron core assembly 16 mainly includes a magnetic plate laminated body 160 and two

pressure members

85a and 86a that pressurize the magnetic plate laminated body 160 in the laminating direction.

The pressurizing

members

85a and 86a alternately include protruding portions 82 protruding toward the magnetic plate laminates 150 and 160 and curved portions 83 curved so as to be separated from the magnetic plate laminates 150 and 160. The protruding portion 82 and the curved portion 83 are formed by bending the

pressure members

85a and 86a. Further, a through hole is formed in the protruding portion 82, and a through hole is also formed at a position corresponding to the protruding portion 82 of the magnetic plate laminated

bodies

150 and 160.

In FIG. 13A, spacers S1 to S3 having through holes formed are arranged between the protruding portions 82 of the

pressure members

85a and 86a and the magnetic plate laminates 150 and 160. However, the case where these spacers S1 to S3 are not present is also included in the scope of the present invention.

In FIG. 13A, when the bolt 99 is inserted into the through hole of the protruding portion 82 and screwed, the magnetic plate laminates 150 and 160 are pressurized as described above. Since the curved portion 83 does not come into contact with the magnetic plate laminates 150 and 160, a larger pressing force acts locally in the region of the protruding portion 82.

FIG. 14 is a diagram showing the magnetic flux density of FIG. 13B of the reactor including the iron core assembly of the present disclosure. In FIG. 14, a part of the high pressure region where the pressing force is high is shown in black. As shown, these high pressure regions are orthogonal to the main magnetic flux passing through the magnetic plate laminates 150 and 160. Further, two high pressure regions are formed between two adjacent bolts 99 (positions of through holes). Therefore, as described above, the magnetostrictive sound of the E-core reactor 100 including the magnetic plate laminates 150 and 160 can be reduced. The high pressure region may be a region connecting the inner surface and the outer surface of the outer peripheral iron core 20, and does not necessarily have to be orthogonal to the main magnetic flux.

FIG. 13B is a first perspective view of the iron core assembly in the present disclosure. The pressurizing

members

85b and 86b in FIG. 13B alternately include protruding portions 82 and curved portions 83 similar to those described above. In the

pressure members

85b and 86b, a through hole is formed in the curved portion 83, and a through hole is also formed in a position corresponding to the curved portion 83 of the magnetic plate laminates 150 and 160.

In FIG. 13B, spacers S1 to S3 having through holes are arranged between the curved portions 83 of the

pressure members

85b and 86b and the magnetic plate laminates 150 and 160. However, the case where these spacers S1 to S3 are not present is also included in the scope of the present invention.

The bolt 99 is inserted into the through hole of the curved portion 83, and the magnetic plate laminates 150 and 160 are pressurized as described above. As a result, a larger pressing force acts locally in the region of the protrusion 82. Therefore, as described above, the magnetostrictive sound of the E-core reactor 100 including the magnetic plate laminates 150 and 160 can be reduced.

In the above-described embodiment, the

pressure members

81, 85, 86 and the like are fixed to the magnetic plate of the iron core by the bolt 99 and the like as the holding portion. However, instead of using the bolt 99 or the like, the

pressure members

81, 85, 86 and the like may be fixed to the magnetic plate of the iron core by welding. In this case, the same effect as described above can be obtained while eliminating the need to prepare parts such as bolts.

FIG. 15A is a diagram showing a modified example of the first embodiment. In FIG. 15A, pressure members 81 are arranged at both ends of the outer peripheral iron core 20. Then, a bolt 99 is inserted into the through hole 98 of one pressure member 81 and the through hole 29 of the outer peripheral iron core 20 from one end side of the outer peripheral iron core 20, and the other pressure member is inserted on the other end side of the outer peripheral iron core 20. The tip of the bolt 99 protruding from the through hole 98 of 81 is held by the nut 96.

Further, FIG. 15B is a diagram showing another modification of the first embodiment. In FIG. 15B, the pressure member 81 is arranged at one end of the outer peripheral iron core 20, and the pedestal 60 is not arranged at the other end of the outer peripheral iron core 20. Then, a bolt 99 was inserted into the through hole 98 of one of the pressure members 81 and the through hole 29 of the outer peripheral iron core 20 from one end side of the outer peripheral iron core 20, and came out of the through hole 29 at the other end of the outer peripheral iron core 20. The tip of the bolt 99 is held by the nut 96.

It can be seen that even in the cases shown in FIGS. 15A and 15B, it is included in the scope of the present invention and the same effect as described above can be obtained.

According to the first aspect of the present disclosure, the outer peripheral iron core surrounding the outer circumference and at least three iron core coils in contact with or coupled to the inner surface of the outer peripheral iron core are provided. Each of the at least three core coils is composed of an iron core and a coil wound around the iron core, and the radial inner end of each of the at least three cores is located near the center of the outer peripheral core. A gap that converges toward the center of the outer peripheral core and is magnetically connectable between one of the at least three cores and the other core adjacent to the one core. The radial inner ends of the at least three cores are separated from each other via a magnetically connectable gap, and the outer peripheral cores are laminated with a plurality of magnetic plates in the stacking direction. Further, there is provided a reactor provided with a pressurizing member having a plurality of convex portions that locally pressurize the outer peripheral iron core in the stacking direction.
According to the second aspect, in the first aspect, the pressurizing member is arranged at one end of the outer peripheral iron core over the entire region between the inner peripheral surface and the outer peripheral surface of the outer peripheral iron core.
According to the third aspect, in the first or second aspect, the pressure region pressurized by the plurality of convex portions extends between the inner peripheral surface and the outer peripheral surface of the outer peripheral iron core.
According to the fourth aspect, in any one of the first to third aspects, the plurality of protrusions are formed by partially bending the pressurizing member.
According to the fifth aspect, in any one of the first to fourth aspects, the holding portion for holding the state in which the outer peripheral iron core is pressurized by the pressurizing member is provided.
According to the sixth aspect, a pressurizing member including a magnetic plate laminate in which a plurality of magnetic plates are laminated in the stacking direction and a plurality of convex portions for locally pressurizing the magnetic plate laminate in the stacking direction. An iron core assembly comprising the above is provided.
According to the seventh aspect, in the sixth aspect, the pressure region pressurized by the plurality of convex portions extends between the inner surface and the outer surface of the magnetic plate laminate.
According to the eighth aspect, in the sixth or seventh aspect, each of the plurality of protrusions was formed by a spacer arranged between the pressure member and the magnetic plate laminate.
According to the ninth aspect, in the eighth aspect, the plurality of convex portions are integrally formed with the pressurizing member.
According to the tenth aspect, in the sixth or seventh aspect, the plurality of protrusions are formed by partially bending the pressurizing member.
According to the eleventh aspect, in any one of the sixth to tenth aspects, the holding portion for holding the state in which the outer peripheral iron core is pressurized by the pressurizing member is provided.

Effect of Aspect In the first aspect, the plurality of magnetic plates constituting the outer peripheral iron core are locally pressurized with a higher pressure in the stacking direction of the magnetic plates by the plurality of convex portions of the pressurizing member. Therefore, the magnetostrictive sound of the reactor, particularly the magnetostrictive sound generated in the outer peripheral iron core can be sufficiently reduced. Since the plurality of iron cores are surrounded by the outer peripheral iron cores, it is possible to effectively prevent the magnetostrictive sound generated by the plurality of iron cores from leaking to the outside by reducing the magnetostrictive sound generated by the outer peripheral iron cores. Further, since the pressure can be applied by a strong force by using a plurality of convex portions, it is not necessary to additionally form a through hole, and it is possible to avoid an increase in iron loss.
In the second aspect, since the outer peripheral iron core is totally pressurized, the occurrence of magnetostrictive sound can be sufficiently reduced, and as a result, it is not necessary to form a through hole. Therefore, it is possible to avoid an increase in iron loss.
In the third aspect, when the pressure region extends between the inner peripheral surface and the outer peripheral surface of the outer peripheral iron core, the effect of suppressing the magnetostrictive sound can be enhanced. When the pressurized region is orthogonal to the main magnetic flux passing through the outer peripheral iron core, the effect of suppressing the magnetostrictive sound is the highest.
In the fourth aspect, a plurality of convex portions can be easily formed.
In the fifth aspect, the holding portion can effectively reduce the generation of magnetostrictive sound. The holding part can be a bolt, a screw, or a welded part.
In the sixth aspect, the plurality of magnetic plates constituting the magnetic plate laminate are locally pressed with a higher pressure in the stacking direction of the magnetic plates by the plurality of convex portions of the pressurizing member. Therefore, when the reactor is created from the iron core assembly including the magnetic plate laminate, the magnetostrictive sound generated in the iron core assembly including the magnetic plate laminate of the reactor can be sufficiently reduced. Further, since the pressure can be applied by a strong force by using a plurality of convex portions, it is not necessary to additionally form a through hole, and it is possible to avoid an increase in iron loss.
In the seventh aspect, when the pressure region extends between the inner surface and the outer surface of the magnetic plate laminate, the effect of suppressing the magnetostrictive sound can be enhanced. When the pressurized region is orthogonal to the main magnetic flux passing through the magnetic plate laminate, the effect of suppressing the magnetostrictive sound is the highest.
In the eighth aspect, when the pressure member is a general plate material, a plurality of convex portions can be easily formed.
In the ninth and tenth aspects, a plurality of protrusions can be easily formed.
In the eleventh aspect, the holding portion effectively suppresses the generation of magnetostrictive sound. The holding part can be a bolt, a screw, or a welded part.

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

5 Core body 6

Reactor

15, 16 Iron core assembly 20 Outer peripheral iron core 24-27 Outer peripheral iron core part 24a-27C Notch 28 Magnetic plate 29 Through hole 31-34 Iron core coil 41-44 Iron core 51-54 Coil 60 Pedestal 61 added Pressurizing member 61a to 61c Extension 65 Notch 67a to 67c Leg 68 Through hole 68a to 68c Additional leg 69 Opening (pedestal)
71-74

Common notches

81, 85b, 86b Pressurizing member 82 Protruding part (convex part)
83 Curved part 84 Flat part (convex part)
87 Spacer 88 Protruding part (convex part)
89 Opening (pressurizing member)
98 Through hole 96 Nut (holding part)
99, 95 bolts (holding part)
100 E-core reactor 101-104 Gap 150 First iron core, magnetic plate laminate 160 Second iron core, magnetic plate laminate 171-173 Coil S1-S3 Spacer

Claims

The outer peripheral iron core that surrounds the outer circumference,
It comprises at least three iron core coils that are in contact with or coupled to the inner surface of the outer peripheral iron core.
Each of the at least three core coils is composed of an iron core and a coil wound around the iron core.
The radial inner ends of each 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 magnetically connectable gap is formed between one of the at least three cores and the other core adjacent to the one core, and the radial inside of the at least three cores. The ends are separated from each other through a magnetically connectable gap.
The outer peripheral iron core is formed by laminating a plurality of magnetic plates in the laminating direction.
further,
A reactor comprising a pressurizing member having a plurality of convex portions that locally pressurize the outer peripheral iron core in the laminating direction.
The reactor according to claim 1, wherein the pressurizing member is arranged at one end of the outer peripheral iron core over the entire region between the inner peripheral surface and the outer peripheral surface of the outer peripheral iron core.
The reactor according to claim 1 or 2, wherein the pressurized region pressurized by the plurality of convex portions straddles between the inner peripheral surface and the outer peripheral surface of the outer peripheral iron core.
The reactor according to any one of claims 1 to 3, wherein the plurality of convex portions are formed by partially bending the pressurizing member.
The reactor according to any one of claims 1 to 4, further comprising a holding portion for holding a state in which the outer peripheral iron core is pressurized by the pressurizing member.
A magnetic plate laminate in which a plurality of magnetic plates are laminated in the stacking direction,
An iron core assembly comprising a pressurizing member having a plurality of convex portions that locally pressurize the magnetic plate laminate in the laminating direction.
The iron core assembly according to claim 6, wherein the pressurized region pressurized by the plurality of convex portions straddles between the inner surface and the outer surface of the magnetic plate laminate.
The iron core assembly according to claim 6 or 7, wherein each of the plurality of convex portions is formed by a spacer arranged between the pressure member and the magnetic plate laminate.
The iron core assembly according to claim 8, wherein the plurality of convex portions are integrally formed with the pressurizing member.
The iron core assembly according to claim 6 or 7, wherein the plurality of convex portions are formed by partially bending the pressurizing member.
The iron core assembly according to any one of claims 6 to 10, further comprising a holding portion for holding a state in which the outer peripheral iron core is pressurized by the pressurizing member.