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CN-115398777-B - Iron core sheet, stator core, stator, rotating electrical machine, and method for manufacturing iron core sheet

CN115398777BCN 115398777 BCN115398777 BCN 115398777BCN-115398777-B

Abstract

The core sheet is formed of an integrally molded compact having a columnar first member and a plate-like second member, wherein the first member has a first cross section in which a first average aspect ratio of the soft magnetic particles is 1.2 or more, and the second member has a second average aspect ratio of 1.2 or more, wherein the first average aspect ratio is a ratio L12/L11 of an average length L11 to an average length L12 of the first cross section, wherein the second average aspect ratio is a ratio L22/L21 of an average length L21 of the second cross section, wherein the average length L11 is an average of lengths of the soft magnetic particles in a radial direction of the stator core, wherein the average length L12 is an average of lengths of the soft magnetic particles in an axial direction of the stator core, wherein the average length L21 is an average of lengths of the soft magnetic particles in the radial direction of the stator core, and wherein the average length L22 is an average of lengths of the soft magnetic particles in a circumferential direction of the stator core.

Inventors

  • Saito Dachiya
  • UENO TOMOYUKI
  • Yi Zhilingchaozhi

Assignees

  • 住友电气工业株式会社
  • 住友电工烧结合金株式会社

Dates

Publication Date
20260512
Application Date
20210331
Priority Date
20200508

Claims (10)

  1. 1. A stator core of a rotary electric machine having a ring-shaped stator core and an axial gap, The core sheet has: A columnar first member extending in an axial direction of the stator core, and A plate-shaped second member provided on a first end side in an axial direction of the stator core of the first member, The first member and the second member are constituted by integrally molded compact, The compact has a plurality of soft magnetic particles, The soft magnetic particles are in the shape of a flat, In a first cross section of the first member in the axial direction and the radial direction of the stator core, a first average aspect ratio of the soft magnetic particles is 1.2 or more, In a second cross section of the second member orthogonal to the axial direction of the stator core, the second average aspect ratio of the soft magnetic particles is 1.2 or more, The first average aspect ratio is the ratio L12/L11 of the average length L11 and the average length L12 of the first cross section, The second average aspect ratio is the ratio L22/L21 of the average length L21 and the average length L22 of the second cross section, The average length L11 is an average of lengths of the soft magnetic particles in a radial direction of the stator core, The average length L12 is an average of lengths of the soft magnetic particles in an axial direction of the stator core, The average length L21 is an average of lengths of the soft magnetic particles in a radial direction of the stator core, The average length L22 is an average of lengths of the soft magnetic particles in the circumferential direction of the stator core.
  2. 2. The iron core sheet according to claim 1, wherein, The relative density of the pressed powder compact is 85% or more.
  3. 3. The iron core sheet according to claim 1 or 2, wherein, The soft magnetic particles are composed of pure iron or an iron-based alloy, The iron-based alloy is an Fe-Si based alloy, an Fe-Al based alloy or an Fe-Si-Al based alloy.
  4. 4. The iron core sheet according to claim 1 or 2, wherein, The soft magnetic particles have an average particle diameter of 30 μm or more.
  5. 5. The iron core sheet according to claim 1 or 2, wherein, The second height is more than 80% of the first height of the iron core piece, The first height is a length of the core sheet in an axial direction of the stator core, The second height is a length of a region other than the second member among the core pieces in an axial direction of the stator core.
  6. 6. The iron core sheet according to claim 1 or 2, wherein, The second member has: an outer peripheral surface disposed on an outer peripheral side of the stator core; an inner peripheral surface disposed on an inner peripheral side of the stator core, and A first end surface disposed on a first end side in an axial direction of the stator core, The corner between the outer peripheral surface and the first end surface and the corner between the inner peripheral surface and the first end surface are chamfered, The chamfer length of the corner is more than 0.1mm and less than 0.5 mm.
  7. 7. A stator core of an axial gap type rotary electric machine, Having a plurality of iron core pieces arranged in a ring shape, Each of the plurality of iron core pieces is the iron core piece according to any one of claims 1 to 6.
  8. 8. A stator of a rotating electrical machine having an axial gap, The device comprises: The stator core as claimed in claim 7, and And coils disposed on the respective first members of the stator core.
  9. 9. A rotary electric machine having a rotor and a stator and having an axial gap, The stator is the stator according to claim 8.
  10. 10. The rotating electrical machine according to claim 9, wherein, The first magnetic resistance of the iron core plate accounts for more than 2% of the magnetic resistance of the rotating motor, The first magnetic resistance is a magnetic resistance of a region other than the second member among the core pieces.

Description

Iron core sheet, stator core, stator, rotating electrical machine, and method for manufacturing iron core sheet Technical Field The present invention relates to a core piece, a stator core, a stator, a rotating electrical machine, and a method for manufacturing the core piece. The present application requests priority based on japanese patent application 2020-082631, 5/8 in 2020, and refers to all of the contents described in the above japanese patent application. Background Patent document 1 discloses a stator core for an axial gap motor. The stator core has a yoke and teeth. Patent document 1 Japanese patent laid-open No. 2009-44829 Disclosure of Invention The stator core of a rotating electrical machine according to the present invention is configured to have a columnar first member extending in an axial direction of the stator core, and a plate-like second member provided on a first end side of the axial direction of the stator core of the first member, wherein the first member and the second member are formed of an integrally molded compact having a plurality of soft magnetic particles, the soft magnetic particles have a flat shape, a first cross section of the first member in the axial direction and the radial direction of the stator core, a first average aspect ratio of the soft magnetic particles is 1.2 or more, a second cross section of the second member orthogonal to the axial direction of the stator core, a second average aspect ratio of the soft magnetic particles is 1.2 or more, the first average aspect ratio is a ratio L12/L11 of an average length L11 of the first cross section, the second average aspect ratio L21 of the average length L22 of the soft magnetic particles is the average length L22 of the soft magnetic particles in the radial direction of the soft magnetic particles, and the average length L22 of the soft magnetic particles is the average length L21 of the soft magnetic particles in the radial direction of the stator core, and the average length L12 of the soft magnetic particles is the average length L21 of the soft magnetic particles is the average length L12. The stator core according to the present invention is a stator core of an axial gap type rotary electric machine, and includes a plurality of core pieces arranged in a ring shape, each of the plurality of core pieces being a core piece according to the present invention. The stator according to the present invention is a stator of an axial gap type rotating electrical machine, and includes a stator core according to the present invention and coils disposed on the respective first members of the stator core. The rotating electrical machine according to the present invention is an axial gap type rotating electrical machine having a rotor and a stator, and the stator is a stator according to the present invention. A method for manufacturing a core piece for a stator core of a rotating electrical machine, the method comprising the steps of filling a mold with a raw material powder containing a plurality of soft magnetic particles having a spherical shape, and compressing the raw material powder in the mold to form a molded body, wherein the core piece comprises a columnar first member extending in the axial direction of the stator core, and a plate-shaped second member provided on the first end side of the first member in the axial direction of the stator core, and the direction in which the raw material powder is compressed is the radial direction of the stator core. Drawings Fig. 1 is a schematic perspective view showing a core plate according to embodiment 1. Fig. 2 is a schematic plan view showing a core plate according to embodiment 1. Fig. 3 is a view of the core piece according to embodiment 1 as seen from the inner peripheral surface side. Fig. 4 is an IV-IV cross-sectional view of the iron core piece shown in fig. 3. Fig. 5 is a V-V cross-sectional view of the iron core piece shown in fig. 3. Fig. 6 is a VI-VI cross-sectional view of the iron core piece shown in fig. 3. Fig. 7 is a cross-sectional view VII-VII of the core segment shown in fig. 2. Fig. 8 is an enlarged view schematically showing the inside of the broken line circle of fig. 7. Fig. 9 is an enlarged view schematically showing the inside of the broken line circle of fig. 5. Fig. 10 is an X-X cross-sectional view of the core sheet shown in fig. 2. Fig. 11 is a plan view showing an opening edge of a die for manufacturing a core piece according to embodiment 1. Fig. 12 is a schematic cross-sectional view showing a mold for manufacturing a first member of a core plate according to embodiment 1. Fig. 13 is a schematic cross-sectional view showing a mold for manufacturing a second member of a core plate according to embodiment 1. Fig. 14 is a schematic cross-sectional view showing a mold for manufacturing a third component of the iron core piece according to embodiment 1. Fig. 15 is a schematic perspective view showing a core plate according to embodiment 2. F