WO2022191038A1 - コアならびにコアを備えた電磁機器 - Google Patents
コアならびにコアを備えた電磁機器 Download PDFInfo
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- WO2022191038A1 WO2022191038A1 PCT/JP2022/009193 JP2022009193W WO2022191038A1 WO 2022191038 A1 WO2022191038 A1 WO 2022191038A1 JP 2022009193 W JP2022009193 W JP 2022009193W WO 2022191038 A1 WO2022191038 A1 WO 2022191038A1
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- Prior art keywords
- core
- slots
- slot
- recess
- coils
- Prior art date
Links
- 239000011347 resin Substances 0.000 claims abstract description 46
- 229920005989 resin Polymers 0.000 claims abstract description 46
- 238000010030 laminating Methods 0.000 claims description 8
- 238000003475 lamination Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 26
- 230000002093 peripheral effect Effects 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 238000009413 insulation Methods 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
Definitions
- the present invention relates to a core and an electromagnetic device with a core.
- a stator of a motor includes a substantially annular core and a plurality of coils inserted into a plurality of slots formed on the inner peripheral surface of the core. See Patent Document 1, for example.
- linear motors which are easy to drive at high speeds and excellent in quietness, have become popular as drive units for various industrial machines, such as spindle/table feed mechanisms for machine tools and magnetic head drive mechanisms for OA equipment.
- Such a linear motor slider includes a substantially linear core and a plurality of coils inserted into a plurality of slots formed on one side of the core. See Patent Document 2, for example.
- the coils of electromagnetic devices such as the motors and linear motors mentioned above are enclosed in insulating paper. Further, after the coil is arranged, the entire circumference of the substantially annular or substantially linear core is surrounded by the resin portion.
- the liquid resin When forming the resin part, the liquid resin is depressurized to defoam the gas mixed in the liquid resin. However, if defoaming is insufficient and/or the liquid resin is not sufficiently filled into the slot, voids will occur inside the slot.
- the electromagnetic device includes an armature with a gap, partial discharge may occur in the gap, resulting in destruction of the insulation around the gap.
- a plurality of slots into which coils are to be inserted are formed on one surface of the core, and bottoms of the plurality of slots are provided on the other surface of the core.
- a core is provided having a recess extending therefrom.
- the recess is formed in the bottom of the slot into which the coil is to be inserted, when the resin portion covering the entire armature including the core is formed, the void is induced and generated by the recess. do. Therefore, even if partial discharge occurs around the air gap, since the concave portion is separated from the location where the electric field concentrates, a sufficient insulation distance can be secured between the coil and the core, and partial discharge can occur. can be suppressed. Therefore, a highly reliable core can be provided.
- FIG. 2 is a perspective view of an armature of the linear motor shown in FIG. 1;
- FIG. FIG. 4 shows a first magnetic plate used to form the core of the armature;
- FIG. 4 shows a second magnetic plate used to form the core of the armature;
- FIG. 4 is a cross-sectional view of a motor as an electromagnetic device according to a second embodiment;
- FIG. 4 shows the magnetic plates used to form the core of the stator;
- It is a perspective view of a reactor as an electromagnetic device based on a third embodiment. It is a top view of a reactor.
- FIG. 4 shows a magnetic plate used to form the core of the reactor;
- FIG. 4 shows a magnetic plate used to form the core of the reactor;
- FIG. 11 shows another magnetic plate used to form the core of the reactor; It is a figure which shows the recessed part of another aspect. It is a figure which shows the recessed part of another aspect. 1 is a partial cross-sectional view of an armature of a linear motor in the prior art; FIG.
- FIG. 1 is a cross-sectional view of a linear motor as an electromagnetic device according to the first embodiment
- FIG. 2A is a perspective view of a slider of the linear motor shown in FIG. 1.
- a linear motor 1 as an electromagnetic device includes an armature 10 mainly including a rectangular core 20 and a plurality of coils 30, and a magnet plate 40 having a plurality of magnets arranged side by side. there is
- the core 20 of the armature 10 has one side 21 and the other side 22, and the one side 21 is formed with a plurality of rectangular slots 23 into which the plurality of coils 30 are to be inserted respectively.
- Each of the coils 30 is inserted into the slot 23 while being surrounded by insulating paper 35 . Therefore, the coil 30 and the core 20 are electrically insulated.
- a resin portion 39 is formed around the armature 10 as a whole.
- FIGS. 2B and 2C are diagrams respectively showing the first magnetic plate and the second magnetic plate used to form the core of the armature. As shown in FIG. 2B, a plurality of slots 23 are formed on one side of the magnetic plate 20a corresponding to the one surface 21 of the core 20. As shown in FIG. 2B, a plurality of slots 23 are formed on one side of the magnetic plate 20a corresponding to the one surface 21 of the core 20. As shown in FIG.
- a plurality of slots 23 are similarly formed in the magnetic plate 20b shown in FIG. 2C. Furthermore, at least one recess 29 is formed at a position corresponding to the bottom of each slot 23 . These recesses 29 at least partially extend toward the other surface 22 side (back yoke side) of the core 20 . As shown in FIG. 2C, recesses 29 are formed at both ends of the side corresponding to the bottom of slot 23 .
- the core 20 is formed by laminating a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates.
- regions Z1 to Z3 are set with respect to the core 20 in the stacking direction of the magnetic plates.
- Region Z1 includes one side of core 20 corresponding to the first magnetic plate among the plurality of magnetic plates to be laminated.
- Region Z3 includes the other side of core 20 corresponding to the last magnetic plate among the plurality of magnetic plates to be laminated.
- the area Z2 is an intermediate area sandwiched between the areas Z1 and Z3.
- portions of the core 20 corresponding to the regions Z1 and Z3 are formed by laminating a plurality of magnetic plates 20a.
- a portion of the core 20 corresponding to the region Z2 is formed by laminating a plurality of magnetic plates 20b.
- the recesses 29 are not formed in the portions of the core 20 corresponding to the regions Z1 and Z3. For this reason, the core 20 in the first embodiment has a recess 29 formed only in the intermediate region Z2 in the stacking direction.
- the entire armature 10 with the coils 30 inserted into the slots 23 is immersed in an insulating liquid resin.
- the liquid resin enters the slot 23 and fills the space between the coil 30 , the insulating paper 35 and the slot 23 .
- the armature 10 is removed from the liquid resin and the resin is cured. Thereby, the resin portion 39 is formed.
- the resin is cured, the coil 30, insulating paper 35 and slot 23 are fixed together.
- the gas mixed in the liquid resin and/or the gas captured in the slot 23 by the insulating paper 35 moves upward in the vertical direction. Therefore, such gas is guided from slot 23 to recess 29 and stays in recess 29 . Then, when the resin is cured, the gas forms a gap A inside the concave portion 29 .
- the recess 29 preferably extends at least partially from the bottom of the slot 23 toward the other surface 22 of the core 20 so that the air gap A is formed within the recess 29 .
- the recess 29 shown in FIG. 1 is semicircular, the recess 29 is not limited to a semicircular shape. Recess 29 may have other shapes that extend at least partially from the bottom of slot 23 toward other surface 22 of core 20 .
- the magnetic plate 20b with the concave portion 29 is used only in the intermediate region Z2 of the core 20. The reason for this is that the air gap A tends to occur in the central portion in the stacking direction of the magnetic material.
- the highly reliable core 20 described above can be provided with only a slight increase in manufacturing cost of the core 20 .
- the core 20 may be formed using a plurality of magnetic plates 20b in all the regions Z1 to Z3. In this case, the occurrence of partial discharge can be further suppressed.
- the recess 29 may be formed by machining. These cases are also included in the scope of the present disclosure.
- FIG. 3A is a cross-sectional view of a motor as an electromagnetic device based on the second embodiment.
- a motor 1' as an electromagnetic device includes a stator 10' mainly including an annular core 20' and a plurality of coils 30', and a rotor 40' having a plurality of magnets arranged side by side on the outer peripheral surface.
- a plurality of substantially fan-shaped slots 23' into which the plurality of coils 30' are to be inserted are formed at regular intervals on the inner peripheral surface of the core 20'.
- Each of the coils 30' is inserted into the slot 23' while being surrounded by an insulating paper 35'. Therefore, coil 30' and core 20' are electrically insulated.
- a resin portion 39' is formed around the entire stator 10'.
- the core 20' is formed by laminating a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates.
- FIG. 3B is a diagram showing the magnetic plates used to form the core of the stator.
- a plurality of substantially fan-shaped slots 23' are formed on the inner peripheral surface of the magnetic plate 20a' shown in FIG. 3B.
- each of the plurality of cutouts is formed with at least one recess 29' at a position corresponding to the bottom of each slot 23'.
- These recesses 29' extend at least partially from the bottom of the slot 23' toward the outer peripheral surface of the core 20'.
- recesses 29' are formed at both ends of the side corresponding to the bottom of slot 23'.
- recesses 29' are formed in all of the plurality of magnetic plates 20a' that constitute the core 20'.
- the core 20' is composed only of a plurality of magnetic plates 20a' with recesses 29' formed therein, and does not use magnetic plates (not shown) without recesses 29' formed therein.
- the entire stator 10' with the coils 30' inserted into the slots 23' is immersed in liquid resin to form the resin portion 39' shown in FIG. 3A.
- the stator 10' is taken out from the liquid resin in the axial direction of the core 20', that is, in the stacking direction of the magnetic plates.
- the liquid resin flows axially downward along the slots 23' and the recesses 29'.
- Most of the gas entrained in the liquid resin and/or trapped in the slot 23' by the insulating paper 35' flows axially downward with the liquid resin.
- part of such gas is guided from the slot 23' to the recess 29' with less flow resistance together with the liquid resin, and stays in the recess 29', forming a void A.
- the motor 1' thus formed also provides the same advantages as described above.
- FIG. 4A is a perspective view of a reactor as an electromagnetic device based on the third embodiment
- FIG. 4B is a top view of the reactor.
- the outer core 20'' (core) of the reactor 1'' is inserted into a plurality of cores 41 to 43 arranged in the circumferential direction at equal intervals and slots 23'' formed on both sides of these cores 41 to 43. and coils 31 to 33 that are connected to each other.
- the coils 31-33 are surrounded by insulating paper (not shown).
- the cores 41-43 are integrally formed with the outer core 20'' or are in contact with the outer core 20''.
- the outer peripheral iron core 20'' may have another rotationally symmetrical shape, such as a circular shape.
- the outer core 20'' is composed of a plurality of, for example, three outer core parts 24 to 26 divided at equal intervals in the circumferential direction.
- the outer core portions 24-26 are formed integrally with the cores 41-43, respectively.
- the radially inner ends of the iron cores 41 to 43 are located near the center of the outer peripheral iron core 20''.
- the radially inner ends of each of the cores 41-43 converge toward the center of the outer peripheral core 20'' with a tip angle of about 120 degrees.
- the radially inner ends of cores 41-43 are then separated from each other by magnetically coupleable gaps 101-103.
- the radially inner end of the core 41 is separated from the radially inner ends of the two adjacent cores 42, 43 via the gaps 101, 102, respectively.
- the outer core 20'' is formed by laminating a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates.
- FIG. 4C is a diagram showing a magnetic plate used to form the core of the reactor.
- the magnetic plate 20a'' shown in FIG. 4C is divided into a plurality of magnetic plates 24'-26' corresponding to the outer core portions 24-26.
- Each magnetic plate 24'-26' has at least one recess 29'' similar to that described above formed in the slot 23''.
- recesses 29'' extend at least partially from the bottom of the slots 23'' radially outwardly of the outer core 20''.
- recesses 29 ′′ are formed in all of the plurality of magnetic plates 20 a ′′ that constitute the outer peripheral iron core 20 ′′.
- the outer core 20'' is composed only of a plurality of magnetic plates 20a'' having recesses 29'', and magnetic plates (not shown) having no recesses 29'' are not used.
- the entire outer core 20'' with the coils 31-33 inserted into the slots 23'' is immersed in liquid resin.
- the outer core 20'' is taken out from the liquid resin in the axial direction of the outer core 20'', that is, in the lamination direction of the magnetic plates.
- the liquid resin flows axially downward along the slots 23'' and the recesses 29''.
- the magnetic plate 20a'' as a single member, which is not divided into a plurality of magnetic plates 24' to 26', may be laminated to form the outer core 20. Included within the scope of disclosure.
- FIGS. 5A and 5B are diagrams showing another embodiment of the recess. These drawings show recesses 29a and 29b formed in the core 20 of the linear motor, but similar recesses 29a and 29b are also formed in the core 20' of the motor and the core 20'' of the reactor 10''. can be formed.
- the recesses 29a shown in FIG. 5A are formed at both ends of the side corresponding to the bottom of the slot 23. As shown in FIG. These recesses 29a extend partially toward the other surface 22 of the core 20 and partially toward another adjacent slot 23. As shown in FIG. Therefore, the recess 29a shown in FIG. 5A is further away from the slot 23 in the direction parallel to the other surface 22 than the recess 29' shown in FIG. 1 and the like.
- the insulation distance between the coil 30 and the core 20 can be further secured than in the case of FIG. 1, so the occurrence of partial discharge can be further suppressed. Therefore, it will be appreciated that the reliability of the core 20 can be further enhanced.
- FIG. 5B extends in an arc shape from the entire side corresponding to the bottom of the slot 23 toward the other surface 22. As shown in FIG.
- the width of the slot 23 parallel to the other surface 22 is always greater than the width of the recess 29b. Therefore, the coil 30 inserted into the slot 23 is not displaced toward the other surface 22 even when the recess 29b is formed. Therefore, in FIG. 5B, the aforementioned effects can be achieved while the coil 30 is kept in the proper position.
- a concave portion having another shape in which the width of the slot 23 is larger than the width of the concave portion may be adopted.
- FIG. 6 is a partial cross-sectional view of the armature of the linear motor in the prior art.
- the linear motor armature 100 shown in FIG. 6 includes a core 200 in which a plurality of slots 230 are formed. Coils 300 covered by insulating paper 350 are inserted into the plurality of slots 230 respectively. Furthermore, a resin portion 390 is formed around the entire circumference of the armature.
- the entire armature 100 is immersed in liquid resin and then taken out. As gas entrained in the liquid resin moves vertically upward, such gas remains at the bottom of slot 230 . Then, as shown in FIG. 6, the gas forms a gap A between the bottom of the slot 230 and the insulating paper 350 of the coil 300 .
- the slot 230 and the coil 300 have similar shapes.
- recesses 29, 29', 29'' are formed in slots 23, 23', 23'' as shown in FIGS.
- the shape of 23', 23'' and the shape of coils 30, 30', 31-33 are not similar to each other. Even such cases are included in the scope of the present disclosure.
- one side (21) of the core has a plurality of slots (23, 23′, 23) into which coils are to be inserted. '') are formed, and recesses (29, 29', 29'') extending toward the other side (22) of the core are formed at the bottom of the plurality of slots. be done.
- the shape of the coil is not similar to the shape of the slot in which the recess is formed.
- the core is formed by stacking a plurality of magnetic plates (20a, 20a', 20a'', 20b), and the recess is It is formed only on the magnetic plate (20b) positioned in the middle portion of the core in the stacking direction among the plurality of magnetic plates.
- the core is formed by laminating a plurality of magnetic plates (20a, 20a', 20a'', 20b), The concave portions are formed in all of the plurality of magnetic plates (20a', 20a'').
- the electromagnetic device is a linear motor (1), a motor (1') or a reactor (1'').
- the recess is formed in the bottom of the slot into which the coil is to be inserted, when the resin portion covering the entire armature including the core is formed, the void is guided to the recess. occur. Therefore, even if partial discharge occurs around the air gap, since the concave portion is separated from the location where the electric field concentrates, a sufficient insulation distance can be secured between the coil and the core, and partial discharge can occur. can be suppressed. Therefore, a highly reliable core can be provided.
- the second aspect even if the coil and the slot are not similar to each other, the above effects can be obtained.
- the electromagnetic device provided with the core when the electromagnetic device provided with the core is a linear motor, it is highly likely that the air gap is formed in the middle portion in the stacking direction. can be kept to a limit.
- the electromagnetic device provided with the core when the electromagnetic device provided with the core is a motor or a reactor, when the core is taken out from the liquid resin in the axial direction, the gas or the like mixed in the liquid resin increases the flow resistance together with the liquid resin. is guided to fewer recesses. Therefore, it is particularly advantageous when the electromagnetic device is a motor or a reactor.
Abstract
Description
図1は第一実施形態に基づく電磁機器としてのリニアモータの断面図であり、図2Aは図1に示されるリニアモータのスライダの斜視図である。図1に示されるように、電磁機器としてのリニアモータ1は、矩形のコア20と複数のコイル30とを主に含む電機子10と、複数の磁石が並置された磁石板40とを含んでいる。
1番目の態様によれば、コア(20、20’、20’’)において、該コアの一面(21)にはコイルが挿入されるべき複数のスロット(23、23’、23’’)が形成されており、該複数のスロットの底部には、前記コアの他面(22)に向かって延びる凹部(29、29’、29’’)が形成されている、コアが提供される。
2番目の態様によれば、1番目の態様において、前記コイルの形状と、前記凹部が形成された前記スロットの形状とが相似ではないようにした。
3番目の態様によれば、1番目または2番目の態様において、前記コアは複数の磁性板(20a、20a’、20a’’、20b)を積層することにより形成されており、前記凹部は、前記複数の磁性板のうちの、前記コアの積層方向中間部分に位置する磁性板(20b)にのみ形成されている。
4番目の態様によれば、1番目から3番目のいずれかの態様において、前記コアは複数の磁性板(20a、20a’、20a’’、20b)を積層することにより形成されており、前記凹部は、前記複数の磁性板(20a’、20a’’)の全てに形成されている。
5番目の態様によれば、1番目から4番目のいずれかのコアと、前記複数のスロットに挿入されたコイル(30、30’、31~33)と、該コイルを包囲する絶縁紙(35、35’)と、前記コア全体を被覆する絶縁樹脂部(39、39’、39’’)と、を具備する、電磁機器が提供される。
6番目の態様によれば、5番目の態様において、前記電磁機器がリニアモータ(1)、モータ(1’)またはリアクトル(1’’)であるようにした。
1番目の態様においては、コイルが挿入されるべきスロットの底部に凹部が形成されているので、コアを含む電機子全体を被覆する樹脂部を形成したときに、空隙は凹部に誘導されて発生する。このため、空隙周りで部分放電が生じたとしても、凹部は電界が集中する箇所から離間しているので、コイルとコアとの間の絶縁距離を十分に確保することができ、部分放電の発生を抑制できる。それゆえ、信頼性の高いコアを提供することができる。
2番目の態様においては、コイルとスロットとが互いに相似でない場合であっても、前述した効果を奏することができる。
3番目の態様においては、コアを備えた電磁機器がリニアモータである場合には、空隙が積層方向の中間部分に形成される可能性が高いので、凹部が形成された磁性板の数を最小限に抑えることができる。
4番目の態様においては、コアを備えた電磁機器がモータまたはリアクトルである場合には、コアを液体樹脂から軸方向に取出すときに、液体樹脂に混入している気体等は液体樹脂と共に流動抵抗のより少ない凹部へ誘導される。このため、電磁機器がモータまたはリアクトルである場合に特に有利である。
1’ モータ(電磁機器)
1’’ リアクトル(電磁機器)
10 電機子
10’ ステータ
20、20’、20’’ コア、外周部鉄心
20a、20a’、20a’’、20b 磁性板
21 一面
22 他面
23、23’、23’’ スロット
24~26 外周部鉄心部分
29、29’、29’’ 凹部
30、30’、31~33 コイル
35、35’ 絶縁紙
39、39’、39’’ 樹脂部(絶縁樹脂部)
41~43 鉄心
Z1~Z3 領域
Claims (6)
- コアにおいて、
該コアの一面にはコイルが挿入されるべき複数のスロットが形成されており、
該複数のスロットの底部には、前記コアの他面に向かって延びる凹部が形成されている、コア。 - 前記コイルの形状と、前記凹部が形成された前記スロットの形状とが相似ではないようにした請求項1に記載のコア。
- 前記コアは複数の磁性板を積層することにより形成されており、
前記凹部は、前記複数の磁性板のうちの、前記コアの積層方向中間部分に位置する磁性板にのみ形成されている、請求項1または2に記載のコア。 - 前記コアは複数の磁性板を積層することにより形成されており、
前記凹部は、前記複数の磁性板の全てに形成されている、請求項1または2に記載のコア。 - 請求項1から4のいずれか一項に記載のコアと、
前記複数のスロットに挿入されたコイルと、
該コイルを包囲する絶縁紙と、
前記コア全体を被覆する絶縁樹脂部と、を具備する、電磁機器。 - 前記電磁機器がリニアモータ、モータまたはリアクトルであるようにした、請求項5に記載の電磁機器。
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CN202280018498.7A CN116964901A (zh) | 2021-03-09 | 2022-03-03 | 芯以及具备芯的电磁设备 |
DE112022000394.4T DE112022000394T5 (de) | 2021-03-09 | 2022-03-03 | Kern und elektromagnetische vorrichtung mit einem kern |
JP2023505487A JPWO2022191038A1 (ja) | 2021-03-09 | 2022-03-03 | |
US18/548,550 US20240153688A1 (en) | 2021-03-09 | 2022-03-03 | Core and electromagnetic device provided with core |
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JP2021037639 | 2021-03-09 | ||
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JPH1198722A (ja) * | 1997-09-18 | 1999-04-09 | Denso Corp | 回転電機の電機子 |
JP2015100153A (ja) * | 2013-11-18 | 2015-05-28 | 株式会社デンソー | 回転電機の固定子鉄心およびその製造方法 |
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JP6846911B2 (ja) | 2016-11-10 | 2021-03-24 | 三菱電機株式会社 | 磁極、磁極を配置した固定子、固定子を備えた回転電機および固定子の製造方法 |
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JPH1198722A (ja) * | 1997-09-18 | 1999-04-09 | Denso Corp | 回転電機の電機子 |
JP2015100153A (ja) * | 2013-11-18 | 2015-05-28 | 株式会社デンソー | 回転電機の固定子鉄心およびその製造方法 |
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