公开(公告)号：US20240071659A1

公开(公告)日：2024-02-29

申请号：US18455860

申请日：2023-08-25

Applicant: TDK CORPORATION

Inventor： Isao KANADA ,  Hiroshi ITO ,  Kyohei TAKAHASHI

IPC: H01F1/147 ,  B22F1/054 ,  B22F1/10 ,  B22F1/145 ,  B22F3/02 ,  C22C19/07

CPC classification number: H01F1/14733 ,  B22F1/054 ,  B22F1/10 ,  B22F1/147 ,  B22F3/02 ,  C22C19/07 ,  B22F2202/01 ,  B22F2301/15 ,  B22F2304/054 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02

Abstract: A metal magnetic powder includes: metal nanoparticles having an average particle size (D50) is 1 nm to 100 nm, and a main phase of hcp-Co; and an additive elements α including at least one of Fe, Ni, and Cu.

公开(公告)号：US20230416460A1

公开(公告)日：2023-12-28

申请号：US18035192

申请日：2022-02-25

Applicant: TDK CORPORATION

Inventor： Takashi INAGAKI ,  Hiroshi ITO

IPC: C08G65/38

CPC classification number: C08G65/38

Abstract: A compound having a chain structure consisting of an aromatic ring group, an ether oxygen atom, a methylene group, an aromatic ring group, a methylene group, an ether oxygen atom, and an aromatic ring group bonded in an order, wherein a hydroxymethyl group is bonded to a carbon atom of the aromatic ring group disposed at a first end of the chain structure, and one end group selected from a hydroxyl group, an amino group, an amide group, and a carboxyl group is bonded to a carbon atom of the aromatic ring group disposed at a second end of the chain structure.

公开(公告)号：US20230343497A1

公开(公告)日：2023-10-26

申请号：US18302270

申请日：2023-04-18

Applicant: TDK CORPORATION

Inventor： Kyohei TAKAHASHI ,  Hiroshi ITO ,  Isao KANADA ,  Kazuhiro YOSHIDOME

IPC: H01F1/08

CPC classification number: H01F1/083 ,  B82Y30/00

Abstract: A metal magnetic powder contains Co as a main component, and the metal magnetic powder includes metal nanoparticles having a mean particle size (D50) of 1 nm or more and 100 nm or less. Each of the metal nanoparticles includes hcp-Co as a main phase, and the metal magnetic powder includes fcc-Co and/or ε-Co as a sub-phase.

公开(公告)号：US20240071662A1

公开(公告)日：2024-02-29

申请号：US18455842

申请日：2023-08-25

Applicant: TDK CORPORATION

Inventor： Kyohei TAKAHASHI ,  Hiroshi ITO ,  Isao KANADA

IPC: H01F1/20 ,  B22F1/054 ,  B22F1/145 ,  B22F3/02 ,  B22F9/04 ,  B22F9/30 ,  C22C19/00 ,  C22C19/07

CPC classification number: H01F1/20 ,  B22F1/054 ,  B22F1/147 ,  B22F3/02 ,  B22F9/04 ,  B22F9/30 ,  C22C19/002 ,  C22C19/007 ,  C22C19/07 ,  B22F2201/11 ,  B22F2202/01 ,  B22F2301/15 ,  B22F2304/054 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02

Abstract: The metal magnetic powder includes Co as a main component, and an average particle size (D50) of 1 nm to 100 nm. An X-ray diffraction chart of the metal magnetic powder has a first peak that appears in a range of a diffraction angle 2θ of 41.6±0.3°, and a second peak that appears in a range of a diffraction angle 20θ of 47.4±0.3°. When a full width at half maximum of the first peak is set as FW1, and a full width at half maximum of the second peak is set as FW2, a ratio (FW2/FW1) of FW2 to FW1 is 1 to 5.

公开(公告)号：US20180299296A1

公开(公告)日：2018-10-18

申请号：US15944943

申请日：2018-04-04

Applicant: TDK Corporation

Inventor： Naoki MORI ,  Hiroshi ITO ,  Yoshiaki OKADA

IPC: G01D5/16 ,  H01F1/057 ,  H01F7/02

Abstract: A magnet has a circular cylinder or circular tube shape and contains magnetic crystal grains, wherein an orientation of magnetization of the magnet is in a direction perpendicular to an axis of the circular cylinder or the circular tube, and directions of axes of easy magnetization of the magnetic crystal grains are isotropic.

公开(公告)号：US20230339018A1

公开(公告)日：2023-10-26

申请号：US18302517

申请日：2023-04-18

Applicant: TDK CORPORATION

Inventor： Kyohei TAKAHASHI ,  Hiroshi ITO ,  Isao KANADA ,  Akito HASEGAWA

IPC: B22F1/102 ,  B22F1/145 ,  B22F1/16 ,  B22F9/24 ,  H01F1/09

CPC classification number: B22F1/102 ,  B22F1/145 ,  B22F1/16 ,  B22F9/24 ,  H01F1/09

Abstract: A metal magnetic powder includes Co as a main component, and the metal magnetic powder includes metal nanoparticles having a mean particle size (D50) of 1 nm or more and 100 nm or less. Each of the metal nanoparticles includes hcp-Co as a main phase, and the metal magnetic powder includes at least one amphoteric metal.

公开(公告)号：US20180083499A1

公开(公告)日：2018-03-22

申请号：US15703248

申请日：2017-09-13

Applicant: TDK Corporation

Inventor： Hideyuki HISANABE ,  Hiroshi ITO ,  Yoshiaki OKADA

IPC: H02K1/17 ,  H02K1/02 ,  H02K1/18

Abstract: A sintered magnet has an arc shape cross-section defined by an outer arc, an inner arc, and a pair of end sides connecting an end point of the outer arc and an end point of the inner arc, and a range of an central angle α of the inner arc is 145°≦α≦180°. The inventors have newly found that a large magnetic flux can be obtained according to the sintered magnet and the characteristics of the motor can be improved, using such a sintered magnet.