JP2017204498A - Wound core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wound core which is prevented from causing ununiformity in temperature distribution in a configuration in which a plurality of wound cores are combined with each other.SOLUTION: A wound core 10 of an embodiment includes: a plurality of wound cores 11 which form an annular shape by being combined with each other; a gap material 12 provided in a gap when the wound cores 11 are combined with each other; and a fastening member 13 for fastening the wound cores 11 into a combined state. The gap material 12 is formed by a ceramic material.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a wound core formed by winding an iron core material.

  For example, a wound core formed by winding an iron core material such as a silicon steel plate in an annular shape is known. Such a wound iron core may be partly cut to pass a coil for replacement or repair at the time of failure, or may be divided into a plurality of iron cores as in Patent Document 1, for example. Sometimes.

JP 2012-134448 A

By the way, when the iron core is cut, the residual stress due to resin impregnation or solidification is released, so that the iron core tends to spread outward. Therefore, the cut surface is horizontally polished so that no gap is generated when the iron cores are combined.
However, even if the cut surfaces of each other are horizontal at the time of manufacture, for example, when operated using a transformer, the amount of heat generated differs between the inner and outer peripheral sides of the iron core, so the combined iron core is deformed. As a result, the gap material is crushed, and as a result, the distance between the iron cores, that is, the gap length is different between the inner peripheral side and the outer peripheral side, resulting in uneven temperature distribution.
Therefore, a wound core that does not cause uneven temperature distribution in a configuration in which a plurality of cores are combined is provided.

  The wound core of the embodiment includes a plurality of cores that form a ring by being combined with each other, a gap material that is disposed in a gap when the cores are combined, and a fastening member that is fastened in a combined state of the cores, The gap material is formed of a ceramic material.

The figure which shows typically the wound iron core by 1st Embodiment. FIG. 1 schematically shows a state where a conventional wound iron core is deformed as a reference example. Fig. 2 schematically showing a state where a conventional wound iron core is deformed as a reference example. Diagram showing another wound core FIG. 1 schematically showing a composite wound core according to the second embodiment. Figure 2 schematically showing a composite wound core Figure 1 schematically showing a single-type wound core Figure 2 schematically showing a single-type wound core The figure which shows typically the wound iron core by 3rd Embodiment. FIG. 1 schematically showing a wound iron core according to a fourth embodiment. Figure 2 schematically showing the wound iron core

Hereinafter, a plurality of embodiments will be described based on the drawings. In the description of each embodiment, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
The first embodiment will be described below with reference to FIGS.
As shown in FIG. 1, the wound core 10 of the present embodiment is fastened in a state where two cores 11, a gap material 12 sandwiched between the iron cores 11, and each iron core 11 and the gap material 12 are combined in an annular shape. Fastening member 13 is provided. The wound iron core 10 is used in a transformer or the like together with a coil (not shown).

  Each iron core 11 is generally formed in a C shape by cutting an iron core material such as a silicon steel plate into a ring shape. At this time, the cut surface of each iron core 11, that is, the end surface 11a, which is a portion where the iron cores 11 face each other, is horizontally polished. For this reason, after cutting, the end faces 11a of the iron cores 11 are parallel to each other. That is, in the wound iron core 10, the gap length (L1) on the inner peripheral side matches the gap length (L2) on the outer peripheral side. Here, “match” means a state including a predetermined tolerance.

  The gap material 12 is provided so as to fill a gap when the iron cores 11 are combined in an annular shape, that is, a space in which the end surfaces 11a of the iron cores 11 face each other. In this embodiment, the gap material 12 is formed of a ceramic material that is a sintered body obtained by baking and solidifying an inorganic material such as ferrite or alumina. For this reason, the gap material 12 has an extremely low coefficient of thermal expansion and a relatively high hardness compared to the iron core 11. That is, the gap material 12 is extremely resistant to changes in shape, and hardly deforms due to temperature or external force. The gap material 12 is bonded or fixed to the iron core 11 with, for example, a resin material.

The fastening member 13 fastens the iron cores 11 in an annular combination with the gap material 12 sandwiched between the iron cores 11. The fastening member 13 firmly fastens the iron core 11 and the gap material 12 so that the iron core 11 having a strength capable of maintaining the iron core 11 in an annular shape and the relatively heavy iron core 11 does not fall apart. Thereby, the wound iron core 10 is formed in a substantially rectangular annular shape having R-shaped corner portions at four corners.
Next, the operation of the above configuration will be described.

First, the trouble which arises in the conventional wound core 110 is demonstrated, referring FIG. 2 and FIG. FIG. 2 schematically shows a conventional wound core 110, except for the material of the gap material 112, which is common to the wound core 10 of the present embodiment shown in FIG. In this conventional wound core 110, the gap material 112 is formed of a material having a relatively low hardness such as soft ferrite, and has a structure that allows deformation.
Therefore, even if the end surface 11a is horizontally polished at the time of manufacture, for example, when actually operated in a transformer or the like, since the magnetic flux flows more easily on the inner peripheral side of the iron core 11, the inner peripheral side is more on the outer peripheral side. However, the amount of heat generation increased, and the amount of deformation on the inner peripheral side increased, leading to deformation of the iron core 11.

  Specifically, for example, when the iron core 11 is firmly fastened by the fastening member 13, deformation to the outer peripheral side is not allowed. Therefore, if the coil is provided so as to surround the gap material 12, the wound iron core is used. 110 is deformed inward as shown in FIG. That is, when the outer peripheral side of the gap material 112 is crushed, the distance between the iron cores 11, that is, the gap length is different between the inner peripheral side and the outer peripheral side. In this case, the gap length on the inner circumferential side (L11, where L11> L1) is increased, while the gap length on the outer circumferential side (L12, where L12 <L1) is decreased. Then, since the magnetic flux is more concentrated on the side where the gap length is short, that is, the outer peripheral side of the wound core 110 in FIG. 2, the outer peripheral side of the wound core 110 further generates heat, and further deformation occurs. It can be caused.

  Alternatively, when the iron core 11 is relatively loosely fastened by the fastening member 13, deformation toward the outer peripheral side is permitted, and the wound iron core 110 is deformed outward as shown in FIG. 3. That is, when the inner peripheral side of the gap material 112 is crushed, the distance between the iron cores 11, that is, the gap length is different between the inner peripheral side and the outer peripheral side. In this case, the gap length on the inner peripheral side (L11, where L11 <L1) is shortened, while the gap length on the outer peripheral side (L12, where L12> L1) is increased. That is, the magnetic resistance is not uniform between the inner and outer peripheral sides of the gap.

Then, since the magnetic flux is more concentrated on the side where the gap length is shortened, that is, the inner peripheral side of the wound core 110 in FIG. 3, the inner peripheral side of the wound core 110 further generates heat. Deformation can be caused.
As described above, conventionally, there is a problem that the gap length changes due to deformation due to thermal expansion during actual operation and the temperature distribution becomes non-uniform.

  On the other hand, in the case of the wound core 10 of the embodiment, the gap material 12 is formed of a ceramic material having a very low coefficient of thermal expansion as described above and a relatively higher hardness than the core 11. For this reason, in the case of the wound iron core 10, it does not deform | transform when it actually drive | operates. That is, in the case of the wound core 10, the gap length is not different between the inner peripheral side and the outer peripheral side.

Thereby, since the gap length does not change between the inner peripheral side and the outer peripheral side, the magnetic resistance can be made uniform, and it is possible to prevent only one of the outer peripheral side and the inner peripheral side from continuing to generate heat. Further, since the gap length does not change, it is possible to prevent the temperature distribution from becoming non-uniform.
At this time, if the fastening member 13 is removed, the wound core 10 can be disassembled into two parts, so that the wound core 10 and a coil (not shown) can be repaired and replaced efficiently, and for example, repair of a transformer, etc. Of course, the configuration is easy.

Further, for example, in the case of another wound core 20 shown in FIG. 4, the same effect as that of the wound core 10 can be obtained. Specifically, the wound iron core 20 includes two iron cores 21 having a shape spreading outward, a gap member 22 formed of a ceramic material provided between the iron cores 21, and a fastening member 13. Yes. The iron core 21 has a shape that has already widened during manufacture, and the cut surfaces of the iron cores 21 are horizontally polished so that they are parallel to each other when the iron core 21 is widened.
Even with such a wound core 20, it is possible to prevent only one of the outer peripheral side and the inner peripheral side from continuing to generate heat, and since the gap length does not change, nonuniform temperature distribution is prevented. be able to.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIGS.
As described in the first embodiment described above, conventionally, there has been a problem that the temperature distribution becomes non-uniform due to a change in gap length due to deformation caused by thermal expansion during actual operation. However, this problem can also be solved by adopting a structure that takes into account deformation due to thermal expansion in advance. Hereinafter, description will be given based on four specific examples 1 to 4.

<Specific example 1>
A wound iron core 30 shown in FIG. 5 includes two iron cores 31, a gap member 32 sandwiched between the iron cores 31, and a fastening member 13 that fastens the iron core 31 and the gap member 32 in a combined state. Each iron core 31 is constituted by a first iron core 31a disposed on the inner peripheral side and a second iron core 31b disposed on the outer peripheral side in a state of being combined in an annular shape. In the case of this example, the gap member 32 is formed of a material that deforms according to a force applied from the outside, for example, soft ferrite.

The 1st iron core 31a and the 2nd iron core 31b are formed by dividing what wound the iron core material so that it may become a respectively different diameter into two. At this time, the outer shape of the first iron core 31a is formed so as to substantially match the inner diameter of the second iron core 31b. For this reason, when the 1st iron core 31a and the 2nd iron core 31b are combined, it will be in the state in which there is almost no mutual clearance gap.
The end surfaces of the first iron core 31a and the second iron core 31b are horizontally polished so as to be parallel to each other. However, the gap length (L1) between the first iron cores 31a arranged on the inner peripheral side is formed to be longer than the gap length (L2) of the second iron core 31b arranged on the outer peripheral side.

That is, in the wound core 30, the gap length is different between the inner circumference side and the outer circumference side in the state where the iron cores 31 are annularly combined, and the gap length (L1) on the inner circumference side is the gap length (L2) on the outer circumference side. It is formed to be longer.
The inner circumferential side gap length and the outer circumferential side gap length are designed based on the amount of heat generated during operation, for example, the amount of heat generated when operating at a rated load. In other words, the gap length on the inner peripheral side and the gap length on the outer peripheral side are set to be approximately the same length during operation in consideration of the amount of deformation of the first iron core 31a and the second iron core 31b due to heat generation during operation. Designed to.

  When the wound iron core 30 is actually operated in a transformer or the like, for example, the inner peripheral side where the magnetic flux easily flows is larger in deformation than the outer peripheral side, so that the gap length on the inner peripheral side becomes shorter. At this time, since the gap member 32 is formed of soft ferrite as described above, the gap 31 is allowed to be shortened by being crushed by the deformation of the iron core 31. That is, the gap material 32 absorbs deformation of the iron core 31 by being compressed.

As a result, during operation, the gap lengths on the inner peripheral side and the outer peripheral side are substantially the same length, the magnetic resistance can be made uniform, and uneven temperature distribution can be prevented.
Further, since the gap material 32 is formed of soft ferrite, the gap material 32 can be easily filled or inserted into the gap having the step.

<Specific example 2>
The wound iron core 40 shown in FIG. 6 includes two iron cores 41, a gap member 42 sandwiched between the iron cores 41, and a fastening member 13 that fastens the iron core 41 and the gap member 42 in a combined state. Each iron core 41 is constituted by a first iron core 41a arranged on the inner peripheral side and a second iron core 41b arranged on the outer peripheral side in a state of being combined in an annular shape. In the case of this example, the gap member 42 is formed of a material that deforms according to a force applied from the outside, for example, soft ferrite.

  The 1st iron core 41a and the 2nd iron core 41b are formed by dividing what wound the iron core material so that it may become a respectively different diameter into two. At this time, the outer shape of the first iron core 41a is formed so as to substantially match the inner diameter of the second iron core 41b. For this reason, when the 1st iron core 41a and the 2nd iron core 41b are combined, it will be in the state in which there is almost no mutual gap.

And the end surface of the 1st iron core 41a and the 2nd iron core 41b is grind | polished so that gap length may become so long that it goes to an inner peripheral side. Specifically, the gap length (L1) between the first iron cores 41a arranged on the inner peripheral side is formed to be longer than the gap length (L2) of the second iron core 41b arranged on the outer peripheral side. Yes.
That is, in the wound core 40, the gap length is different between the inner circumference side and the outer circumference side in a state where the iron core 41 is annularly combined, and the gap length (L1) on the inner circumference side is the gap length (L2) on the outer circumference side. It is formed to be longer.

  The inner circumferential side gap length and the outer circumferential side gap length are designed based on the amount of heat generated during operation, for example, the amount of heat generated when operating at a rated load. In other words, the gap length on the inner peripheral side and the gap length on the outer peripheral side are set to be approximately the same length during operation in consideration of the amount of deformation of the first iron core 41a and the second iron core 41b due to heat generation during operation. Designed to.

When the wound iron core 40 is actually operated in a transformer or the like, for example, the inner peripheral side where the magnetic flux easily flows is larger in deformation than the outer peripheral side, so the gap length on the inner peripheral side becomes shorter. At this time, since the gap material 42 is formed of soft ferrite as described above, the gap 41 is allowed to be shortened by being crushed when the iron core 41 is deformed.
As a result, during operation, the gap lengths on the inner peripheral side and the outer peripheral side are substantially the same length, the magnetic resistance can be made uniform, and uneven temperature distribution can be prevented.
Further, since the gap material 42 is formed of soft ferrite, the gap material 42 can be easily filled or inserted into the gap having the above-described step.

<Specific example 3>
The wound iron core 50 shown in FIG. 7 includes two iron cores 51, a gap material 52 sandwiched between the iron cores 51, and a fastening member 13 that fastens the iron core 51 and the gap material 52 in a combined state. Each iron core 51 is formed by dividing a wound core material into two. And the end surface of each iron core 51 is grind | polished in the step shape so that the gap length (L1) of an inner peripheral side may become longer than the gap length (L2) of an outer peripheral side.

That is, in the wound core 50, the gap length is different between the inner circumference side and the outer circumference side in a state where the iron cores 51 are combined in an annular shape, and the gap length (L1) on the inner circumference side is the gap length (L2) on the outer circumference side. It is formed to be longer.
In the case of this example, the gap member 52 is formed of a material that deforms according to a force applied from the outside, for example, soft ferrite. The gap material 52 is substantially the same as the gap material 32 of the first specific example described above.

  At this time, the gap length on the inner peripheral side and the gap length on the outer peripheral side are designed based on the amount of heat generated during operation, for example, the amount of heat generated when operated with a rated load. In other words, the gap length on the inner peripheral side and the gap length on the outer peripheral side are designed so that both are substantially the same length during operation in consideration of the amount of deformation of the iron core 51 due to heat generation during operation.

  When this wound iron core 50 is actually operated in a transformer or the like, for example, the inner peripheral side where the magnetic flux easily flows is larger in deformation than the outer peripheral side, so the gap length on the inner peripheral side becomes shorter. At this time, since the gap member 52 is formed of soft ferrite as described above, the gap 51 is allowed to be shortened by being crushed when the iron core 51 is deformed.

As a result, during operation, the gap lengths on the inner peripheral side and the outer peripheral side are substantially the same length, the magnetic resistance can be made uniform, and uneven temperature distribution can be prevented.
Further, since the gap material 52 is formed of soft ferrite, the gap material 52 can be easily filled or inserted into the gap having the above-described step.

<Specific Example 4>
The wound iron core 60 shown in FIG. 8 includes two iron cores 61, a gap material 62 sandwiched between the iron cores 61, and a fastening member 13 that fastens the iron core 61 and the gap material 62 in a combined state. And the end surface of each iron core 61 is grind | polished so that gap length may become so long that it goes to an inner peripheral side. Specifically, the inner circumferential gap length (L1) is formed to be longer than the outer circumferential gap length (L2).

That is, in the wound iron core 60, the gap length is different between the inner circumference side and the outer circumference side in the state where the iron core 61 is combined in an annular shape, and the gap length (L1) on the inner circumference side is the gap length (L2) on the outer circumference side. It is formed to be longer.
In the case of this example, the gap member 62 is formed of a material that deforms according to a force applied from the outside, for example, soft ferrite. The gap material 62 is substantially the same as the gap material 42 of the specific example 2 described above.

  The inner circumferential side gap length and the outer circumferential side gap length are designed based on the amount of heat generated during operation, for example, the amount of heat generated when operating at a rated load. In other words, the gap length on the inner peripheral side and the gap length on the outer peripheral side are designed so that both are substantially the same length during operation in consideration of the amount of deformation of the iron core 61 due to heat generation during operation.

  When this wound iron core 60 is actually operated in a transformer or the like, for example, the inner peripheral side where the magnetic flux easily flows is larger in deformation than the outer peripheral side, so the gap length on the inner peripheral side becomes shorter. At this time, since the gap material 62 is formed of soft ferrite as described above, the gap 61 is allowed to be shortened by being crushed when the iron core 61 is deformed.

As a result, during operation, the gap lengths on the inner peripheral side and the outer peripheral side are substantially the same length, the magnetic resistance can be made uniform, and uneven temperature distribution can be prevented.
Further, since the gap material 62 is formed of soft ferrite, the gap material 62 can be easily filled or inserted into the gap having the above-described step.

(Third embodiment)
Hereinafter, the third embodiment will be described with reference to FIG.
As described in the first embodiment described above, conventionally, there has been a problem that the temperature distribution becomes non-uniform due to a change in gap length due to deformation caused by thermal expansion during actual operation. However, this problem can also be solved by adopting a structure that takes into account deformation due to thermal expansion in advance.

  A wound iron core 70 shown in FIG. 9 includes two iron cores 71, a gap material 72 sandwiched between the iron cores 71, and a fastening member 13 that fastens the iron core 71 and the gap material 72 in a combined state. Each iron core 71 is composed of a first iron core 71a disposed on the inner peripheral side and a second iron core 71b disposed on the outer peripheral side in a state of being combined in an annular shape. In the case of this example, the gap material 72 may be soft ferrite, for example, but in this embodiment, it is formed of the ceramic material described in the first embodiment.

  The 1st iron core 71a and the 2nd iron core 71b are formed by dividing what wound the iron core material so that it may become each different diameter into two. The end surfaces of the first iron core 71a and the second iron core 71b are horizontally polished so as to be parallel to each other. And at the time of manufacture, it forms so that the gap length (L1) between the 1st iron cores 71a arrange | positioned at an inner peripheral side and the gap length (L2) of the 2nd iron core 71b arrange | positioned at an outer peripheral side may correspond substantially. ing. That is, the end surfaces of the first iron core 71a and the second iron core 71b are flush with each other in the combined state.

  Thereby, the wound iron core 70 is formed in a substantially rectangular annular shape with four corners having an R shape, and the first iron core 71a and the second iron core 70a in the width direction (the left-right direction in the drawing), that is, the short direction in the substantially rectangular shape. While there is almost no gap between the iron cores 71b, there is a gap 73 (buffer part) between the first iron core 71a and the second iron core 71b in the height direction (vertical direction in the figure), that is, in the longitudinal direction of a substantially rectangular shape. It is formed. That is, the gap 73 is formed between the substantially rectangular annular short-side arms.

The air gap 73 is designed based on the amount of heat generated during operation, for example, the amount of heat generated when operating at a rated load. In other words, the gap 73 is designed in consideration of the amount of deformation of the first iron core 71a due to heat generation during operation.
In the present embodiment, the gap 73 is filled with a filler 74 made of, for example, a resin material. In FIG. 9, the filler 74 is schematically indicated by hatching. Thereby, the first iron core 71a and the second iron core 71b are fixed or fixed to each other in the gap 73. The filler 74 is formed of a material having a relatively lower strength than the gap material 72.

  When this wound core 30 is actually operated in a transformer or the like, for example, the amount of deformation on the inner peripheral side where the magnetic flux easily flows is larger than that on the outer peripheral side, and therefore the amount of deformation of the first iron core 71a is increased. . At this time, since the hardness of the filler 74 is lower than that of the gap material 72 as described above, the first iron core 71 a enters the gap 73 while pressing the filler 74. That is, the deformation of the first iron core 71 a due to heat generation is absorbed by the gap 73. That is, the gap 73 functions as a buffer part.

As a result, during operation, the gap lengths on the inner peripheral side and the outer peripheral side are substantially the same length, the magnetic resistance can be made uniform, and uneven temperature distribution can be prevented.
For example, if the first iron core 71a and the second iron core 71b can be fixed by the longitudinal yoke (the left and right yokes in the figure) by impregnating the resin, the gap 73 is not necessarily filled with the filler 74. May be.

(Fourth embodiment)
Hereinafter, the fourth embodiment will be described with reference to FIGS. 10 and 11.
In the above-described embodiment, an example in which the gap is provided in the yoke on the long side has been described, but the gap may be provided in another position.

  For example, a gap may be provided in the corner portion 80a as in the wound iron core 80 shown in FIG. In the case of the present embodiment, the iron core 81 is formed by a substantially U-shaped iron core 81a having a yoke on the left and right long sides in the drawing and an iron core 81b serving as a short arm portion on the upper side in the drawing. That is, the wound iron core 80 is formed in a substantially rectangular ring shape so that one side on the end side can be divided. The iron core 81a is formed by dividing the core material wound to have different diameters.

Each of the iron cores 81a and 81b is polished so that the end faces thereof are parallel in a state of being combined in an annular shape. And the gap is provided between the end surfaces of each iron core 81a, 81b. In this embodiment, the gap material 82 formed of the ceramic material described in the first embodiment is disposed in this gap.
As described above, even in the wound iron core 80 in which the gap is provided in the R-shaped corner portion 80a, the gap material 82 is formed of a ceramic material, thereby making the temperature distribution non-uniform due to the change in the gap length during operation. Is not invited.

  In addition, since the gap is provided in the corner portion 80a, the short-side arm portion can be pressed against the long-side yoke through the gap material by tightening with the band-shaped fastening member 13. Therefore, the iron core 81 and the gap member 82 can be firmly fastened.

  By the way, when providing a gap, since the magnetic permeability will fall in a gap, it is good also as a structure which adjusts the magnetic permeability in a gap. Specifically, as shown in FIG. 11A, the wound iron core 90 includes iron cores 91 a and 91 b, a gap material 92, and a fastening member 13. Since these iron cores 91a and 91b are substantially in common with the above-described iron cores 81a and 81b, description thereof is omitted.

  As shown in FIG. 11B, the gap member 92 includes a magnetic member 92a formed of a magnetic material and a holding member 92b that holds the magnetic member 92a. The magnetic member 92a is formed into a thin plate shape, for example, of ferrite and a size that fits in the gap. The holding member 92b includes a flange portion having a shape along the corners of the iron cores 91a and 91b, and a holding portion that stores the magnetic member 92a and holds the magnetic member 92a so as not to fall to the inner peripheral side. .

Thereby, the magnetic permeability in the gap can be adjusted by the magnetic member 92a, and the eddy current loss occurrence portion can be reduced and the eddy current path can be interrupted.
Further, by holding the magnetic member 92a by the holding member 92b having the flange portion and the holding portion, it is possible to prevent the magnetic member 92a from being displaced or dropped off.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and the configurations and structures shown in the embodiments can be arbitrarily modified or combined without departing from the scope of the invention.
The wound iron core 10 of the first embodiment may be provided with the magnetic member 92a and the holding member 92b exemplified in the fourth embodiment.

  Although FIG. 5 of 2nd Embodiment illustrated the wound core 30 divided into two 1st iron cores 31a and 2nd iron cores 31b of an inner peripheral side and an outer peripheral side, you may divide the iron core 31 into three or more. That is, the first iron core 31a means that the iron core 31 is disposed on the innermost peripheral side, and the second iron core 31b is the iron core 31 disposed on the outermost peripheral side. This means that the division of the iron core 31 is not limited to two.

Although FIG. 6 of 2nd Embodiment illustrated the wound core 40 which inclined the end surface so that a gap length may change substantially continuously toward an inner peripheral side from an outer peripheral side, it seems that a gap length changes in steps. Alternatively, the end surface may be stepped.
In FIG. 7 of the second embodiment, the wound iron core 50 having two different gap lengths on the inner peripheral side and the outer peripheral side is illustrated, but a configuration having three or more step gap lengths may be used.

  Although FIG. 8 of 2nd Embodiment illustrated the wound core 60 which inclined the end surface so that a gap length may change from an outer peripheral side to an inner peripheral side substantially continuously, it seems that a gap length changes in steps. Alternatively, the end surface may be stepped.

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

  In the drawings, 10, 20, 30, 40, 50, 60, 70, 80, 90 are wound cores, 11, 21, 31, 41, 51, 61, 71, 81, 91 are iron cores, 12, 22, 32, 42, 52, 62, 72, 82 and 92 are gap members, 13 is a fastening member, 31a and 41a are first iron cores (iron cores), 31b and 41b are second iron cores (iron cores), 73 are gaps (buffer portions), Reference numeral 80a denotes a corner, 92a denotes a magnetic member, and 92b denotes a holding member.

Claims (5)

A plurality of cores that form a ring by being combined with each other,
A gap material disposed in the gap when combining the iron cores;
A fastening member for fastening the iron core in a combined state,
The wound iron core is characterized in that the gap material is formed of a ceramic material. A plurality of cores that form a ring by being combined with each other,
A gap material disposed in the gap when combining the iron cores;
A fastening member for fastening the iron core in a combined state,
The gap has an inner circumferential gap length,
A wound core characterized by being formed to be longer than the outer peripheral side. A plurality of cores that form a ring by being combined with each other,
A gap material disposed in the gap when combining the iron cores;
A fastening member for fastening the iron core in a combined state,
The iron core is divided into a first iron core disposed on the inner peripheral side and a second iron core disposed on the outer peripheral side in the state of being combined in an annular shape, and between the first iron core and the second iron core. Further, a wound core that is provided with a buffer portion that allows deformation of the first iron core.   4. The wound core according to claim 1, wherein the gap is provided in a corner portion in a state in which the iron cores are combined in a ring shape. 5.   5. The wound core according to claim 1, wherein the gap member is constituted by a magnetic member formed of a magnetic material and a holding member that holds the magnetic member. .

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