公开(公告)号：US20230068379A1

公开(公告)日：2023-03-02

申请号：US17820069

申请日：2022-08-16

Applicant: MINEBEA MITSUMI Inc.

Inventor： Hideaki SHOWA ,  Daisuke ITO

IPC: G11B19/20 ,  G11B33/02 ,  H02K1/02

Abstract: A spindle motor configured to be used for a hard disk drive device with a gas having a density lower than a density of air sealed in an internal space includes a rotor magnet. The rotor magnet has a radial thickness of 1.0 to 1.4 mm and a density of 5.6 to 6.0 g/cm3.

公开(公告)号：US20230039344A1

公开(公告)日：2023-02-09

申请号：US17444734

申请日：2021-08-09

Applicant: Rolls-Royce Corporation

Inventor： Peter Schenk ,  Mathew Hill ,  David Loder

IPC: H02K1/04 ,  B64D27/24 ,  H02K1/27 ,  H02K1/02 ,  H02K15/10 ,  H02K1/30 ,  H02K15/03

Abstract: A rotor assembly includes a rotor core having an axial length and configured to rotate about a longitudinal axis and at least one permanent magnet disposed about a radially outer surface of the rotor core. The rotor assembly further includes an electrical insulator disposed between the radially outer surface of the rotor core and the at least one permanent magnet and configured to disrupt an electrical conduction path along the axial length of the rotor core.

公开(公告)号：US11509202B2

公开(公告)日：2022-11-22

申请号：US16223971

申请日：2018-12-18

Applicant: ABB Schweiz AG

Inventor： Chenjie Lin ,  Matthew Henriksen ,  Ghanshyam Shrestha ,  Elio Alberto Perigo

IPC: H02K21/02 ,  H02K21/14 ,  H02K1/276 ,  H02K1/02 ,  H02P31/00 ,  H02P1/00

Abstract: A permanent magnet motor is provided that produces variable magnetic flux. The motor may include two different types of permanent magnets with different coercivities. The magnetic state of one of the magnets may be altered during use. In one state, the effective magnetic flux of the motor is greater, and in another state, the effective magnetic flux of the motor is less.

公开(公告)号：US20220368182A1

公开(公告)日：2022-11-17

申请号：US17642906

申请日：2020-10-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Shin SUENAGA ,  Yoshihiro ARITA ,  Yoshifumi OHATA ,  Takashi ARAMAKI ,  Shuji YAMAMOTO

IPC: H02K1/276 ,  H02K1/02 ,  H02K15/12 ,  H02K15/03

Abstract: A rotor is a magnet-embedded rotor incorporated in a traveling motor of a vehicle, and includes: a laminated core having steel sheets laminated to each other and a bonding layer for bonding the steel sheets adjacent to each other in a laminating direction; and a magnet embedded in the laminated core. When the rotor rotates at 11000 rpm, a maximum amount of displacement of an outer edge of the laminated core of the rotor in a radial direction is 0.1 mm or less.

公开(公告)号：US20220352776A1

公开(公告)日：2022-11-03

申请号：US17863486

申请日：2022-07-13

Applicant: Persimmon Technologies, Corp.

Inventor： Martin Hosek ,  Sripati Sah ,  Jayaraman Krishnasamy

IPC: H02K3/28 ,  C23C8/10 ,  C23C4/06 ,  C23C8/02 ,  H01F1/24 ,  H01F41/02 ,  H02K21/12 ,  H02K21/16 ,  H02K1/02 ,  B22F3/115 ,  B22F1/16 ,  H02K1/12 ,  H02K1/22

Abstract: A motor comprises a stator comprising at least one core; a coil wound on the at least one core of the stator; a rotor having a rotor pole and being rotatably mounted relative to the stator; and at least one magnet disposed between the rotor and the stator. The at least one core comprises a composite material defined by iron-containing particles having an alumina layer disposed thereon.

公开(公告)号：US11459645B2

公开(公告)日：2022-10-04

申请号：US16922013

申请日：2020-07-07

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Tomohiro Suetsuna ,  Hiroaki Kinouchi ,  Takahiro Kawamoto

IPC: H01F1/24 ,  H02K1/02 ,  C22C38/10 ,  C21D9/52 ,  C21D8/02 ,  C21D6/00 ,  B22F9/04 ,  B22F3/02 ,  B22F3/24 ,  C22C38/02 ,  H02K15/00 ,  H01F41/02 ,  H01F1/26

Abstract: Provided is a plurality of flaky magnetic metal particles of the embodiments, each flaky magnetic metal particle having a flat surface provided with either or both of a plurality of concavities and a plurality of convexities arranged in a first direction, each concavity or convexity having a width of 0.1 μm or more, a length of 1 μm or more, and an aspect ratio of 2 or higher; and at least one first element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni), the flaky magnetic metal particles having an average thickness of between 10 nm and 100 μm inclusive and an average aspect ratio of between 5 and 10,000 inclusive.

公开(公告)号：US20220302779A1

公开(公告)日：2022-09-22

申请号：US17208482

申请日：2021-03-22

Applicant: Rolls-Royce plc ,  Rolls-Royce Singapore Pte. Ltd.

Inventor： Ellis Fui Hen Chong ,  Shanmukha Rama Krishna ,  Mark Boden

IPC: H02K1/27 ,  H02K1/02 ,  H02K1/04 ,  H02K15/03 ,  H02K1/28

Abstract: A rotor assembly includes a plurality of segmented magnets on an outer surface of a rotor core, a metallic layer on the outer surface of the plurality of segmented magnets, and a plurality of segmented metallic bands on the outer surface of the metallic layer. The plurality of segmented metallic bands is configured to secure the plurality of segmented magnets to the outer surface of the rotor core, and each band of the plurality of metallic bands has an axial length less than an axial length of the rotor.

公开(公告)号：US20220294279A1

公开(公告)日：2022-09-15

申请号：US17636032

申请日：2020-08-06

Applicant: HITACHI METALS, LTD.

Inventor： Shin NOGUCHI ,  Keiko KIKUCHI ,  Mamoru KIMURA ,  Kazunori NISHIMURA

IPC: H02K1/02 ,  B22F1/10 ,  B22F3/02 ,  B22F3/24 ,  H02K1/18 ,  H02K15/03 ,  H01F41/02 ,  H01F1/147

Abstract: A magnetic wedge has high electrical resistance and bending strength, a rotary electric machine employs the magnetic wedge, and a method is for manufacturing the magnetic wedge. The magnetic wedge includes Fe-based soft magnetic particles, which contain an element M that is more readily oxidized than Fe and are bound by an oxide phase including the element M.

公开(公告)号：US20220278566A1

公开(公告)日：2022-09-01

申请号：US17617732

申请日：2020-06-15

Applicant: JFE Steel Corporation

Inventor： Yoshiaki Zaizen ,  Yoshihiko Oda ,  Tomoyuki Okubo ,  Takaaki Tanaka ,  Yukino Miyamoto

IPC: H02K1/02 ,  C21D9/46 ,  B32B15/01 ,  C21D8/12 ,  C21D6/00 ,  C22C38/60 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H02K15/02

Abstract: In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a certain component composition to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a rotor core and a stator core as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950° C. in an atmosphere having a nitrogen content of not more than 30 vol % and a dew point of not higher than −20° C., while a motor core is produced with such a steel sheet.

公开(公告)号：US11407686B2

公开(公告)日：2022-08-09

申请号：US16782343

申请日：2020-02-05

Applicant: TDK Corporation

Inventor： Masanori Ikeda ,  Hiroyuki Morita ,  Yoshitaka Murakawa ,  Shogo Muroya

IPC: C04B35/26 ,  H01F1/11 ,  H01F41/02 ,  C01G51/00 ,  H01F1/10 ,  H02K1/02

Abstract: This ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1): Ca1-w-xRwSrxFezCom  (1) in formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and R comprises at least La, in formula (1), w, x, z and m satisfy formulae (2) to (5): 0.360≤w≤0.420  (2) 0.110≤x≤0.173  (3) 8.51≤z≤9.71  (4) 0.208≤m≤0.269  (5), and in a section parallel to an axis of easy magnetization, when the number of total ferrite grains is N and the number of ferrite grains having a stacking fault is n, 0≤n/N≤0.20 is satisfied.