Magnetic composite material and rotating electric machine

Patent metadata

Field	Value
Publication number	US-12080458-B2
Application number	US-201916291100-A
Country	US
Kind code	B2
Filing date	Mar 4, 2019
Priority date	Sep 12, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

The magnetic composite material of the embodiments is a magnetic composite material that includes a magnetic material having a plane at the surface; and a plate-shaped reinforcing material, the magnetic material having a plurality of magnetic bodies having a planar structure and having a magnetic metal phase containing at least one first element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni), and principal surfaces; and an intercalated phase containing at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F). In the magnetic composite material, the principal surfaces are oriented to be approximately parallel to the plane and have the difference in coercivity on the basis of direction within the plane.

First claim

What is claimed is:

1. A rotating electric machine, comprising:
a magnetic composite material comprising: (i) a plurality of flaky magnetic metal particles; and (ii) an intercalated phase; and
a plate-shaped reinforcing material,
wherein the magnetic composite material has a longitudinal direction along a longest dimension, a first plane parallel to the longitudinal direction, and the first plane is in contact with the plate-shaped reinforcing material,
wherein each of the flaky magnetic metal particles includes a flat surface and a magnetic metal phase containing at least one first element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni),
wherein the flaky magnetic metal particles have an average thickness in a range of from 10 nm to 100 μm,
wherein an average value of a ratio of an average length in the flat surface to a thickness in the flaky magnetic metal particles is in a range of from 5 to 10,000,
wherein the flat surfaces are oriented and are approximately perpendicular to the plate-shaped reinforcing material,
wherein the intercalated phase exists between the flaky magnetic metal particles and contains at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F),
wherein the flat surfaces are disposed to be approximately perpendicular to a gap surface between a stator and a rotor of the rotating electric machine, and
wherein a plurality of the flat surfaces of the flaky magnetic metal particles are in a range of 40° or less.

2. The rotating electric machine of claim 1 , wherein the plate-shaped reinforcing material has a first reinforcing material part and a second reinforcing material part, and
the magnetic composite material is disposed between the first reinforcing material part and the second reinforcing material part.

3. The rotating electric machine of claim 1 , wherein an adhesive layer is disposed between the plate-shaped reinforcing material and the magnetic composite material.

4. The rotating electric machine of claim 1 , wherein the flat surfaces have the difference in coercivity depending on a direction in a second plane, different from the first plane, and
wherein a proportion of the difference in coercivity on the basis of direction within the a second plane is 1% or higher.

5. The rotating electric machine of claim 1 , wherein the flaky magnetic particles further comprise at least one additive element selected from the group consisting of boron (B), silicon (Si), aluminum (Al), carbon (C), titanium (Ti), zirconium (Zr), hafnium (Hf), niobium (Nb), tantalum (Ta), molybdenum (Mo), chromium (Cr), copper (Cu), tungsten (W), phosphorus (P), nitrogen (N), gallium (Ga), and yttrium (Y).

6. The rotating electric machine of claim 1 , wherein the flat surface of each of the flaky magnetic particles has either or both of a plurality of concavities and a plurality of convexities, the concavities or the convexities being arranged in a first direction, having a width of 0.1 μm or more and a length of 1 μm or more, and having an aspect ratio of 2 or higher.

7. The rotating electric machine of claim 1 , wherein the flaky magnetic particles have a lattice strain of from 0.01% to 10%.

8. The rotating electric machine of claim 1 , wherein at least a portion of the surface of the flaky magnetic particles is covered with a coating layer having a thickness of from 0.1 nm to 1 μm and containing at least one of the second elements selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F).

9. The rotating electric machine of claim 1 , wherein the intercalated phase contains a polyimide resin.

10. The rotating electric machine of claim 1 , wherein the plate-shaped reinforcing material is not disposed at a position close to the gap surface.

11. The rotating electric machine of claim 1 , wherein 50% or more of the flat surfaces of the flaky magnetic metal particles are in a range of 40° or less of perpendicular to the plate-shaped reinforcing material.

12. The rotating electric machine of claim 1 , wherein the flat surfaces of the flaky magnetic metal particles are in a range of 40° or less.

Assignees

• Toshiba Kk

Inventors

• Suetsuna Tomohiro
• Kinouchi Hiroaki
• Kawamoto Takahiro

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F1/068

  Flake-like particles · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/08

  Metallic powder characterised by particles having an amorphous microstructure · CPC title