US 12,015,306 B2
Plurality of flaky magnetic metal particles, pressed powder material, and rotating electric machine
Tomohiro Suetsuna, Kawasaki (JP); Hiroaki Kinouchi, Shinagawa (JP); Naoyuki Sanada, Yokohama (JP); and Takahiro Kawamoto, Kawasaki (JP)
Assigned to Kabushiki Kaisha Toshiba, Minato-ku (JP)
Filed by Kabushiki Kaisha Toshiba, Minato-ku (JP)
Filed on Aug. 9, 2019, as Appl. No. 16/536,595.
Claims priority of application No. 2019-051076 (JP), filed on Mar. 19, 2019.
Prior Publication US 2020/0303106 A1, Sep. 24, 2020
Int. Cl. H02K 1/02 (2006.01); B22F 1/068 (2022.01); B22F 1/08 (2022.01); B22F 1/10 (2022.01); B22F 1/16 (2022.01); B22F 3/02 (2006.01); B22F 3/24 (2006.01); H01F 1/26 (2006.01)
CPC H02K 1/02 (2013.01) [B22F 1/068 (2022.01); B22F 1/08 (2022.01); B22F 1/10 (2022.01); B22F 1/16 (2022.01); B22F 3/02 (2013.01); B22F 3/24 (2013.01); H01F 1/26 (2013.01); B22F 2003/248 (2013.01); B22F 2202/05 (2013.01); B22F 2301/15 (2013.01); B22F 2301/35 (2013.01); B22F 2302/45 (2013.01); B22F 2303/01 (2013.01); B22F 2998/10 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A plurality of flaky magnetic metal particles having an average thickness of from 10 nm to 100 μm,
each of the plurality of flaky magnetic metal particles comprising: a flat surface; a magnetic metal phase containing at least one first element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni); and a difference in coercivity on a basis of direction within the flat surface,
the average value of a ratio of an average length within the flat surface with respect to the thickness being from 5 to 10,000, and
multiple ones of the plurality of flaky magnetic metal particles having either a crack in the direction of the thickness of the flaky magnetic metal particle, the crack having a depth equivalent to 10% or more of the thickness of the flaky magnetic metal particle and a width shorter than the depth, or a crack in a direction parallel to the flat surface, the crack having a length equivalent to 10% or more of the thickness of the flaky magnetic metal particle and a width shorter than the length, or the multiple ones of the flaky magnetic metal particles having both of the cracks,
wherein the multiple ones of the plurality of flaky magnetic metal particles having cracks are included at a number proportion of 1% or more.