公开(公告)号：US20240195241A1

公开(公告)日：2024-06-13

申请号：US18552918

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI ,  Rei HONMA

IPC: H02K1/276

CPC classification number: H02K1/276

Abstract: A rotor core has plural holes including holes in which permanent magnets are installed, the rotor core including: a high permeability portion; and a low permeability portion having a relative permeability that is smaller than a relative permeability of the high permeability portion and that is greater than a relative permeability of a vacuum, wherein an entirety of an inner peripheral bridge portion, at least part of a region of which is disposed at an inner peripheral surface side of the rotor core relative to at least one of regions where the permanent magnets are installed, is the low permeability portion.

公开(公告)号：US20220407371A1

公开(公告)日：2022-12-22

申请号：US17776441

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI ,  Miho TOMITA ,  Tesshu MURAKAWA

IPC: H02K1/16 ,  H02K1/02 ,  C22C38/16 ,  C22C38/10 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  G06F30/36

Abstract: The present invention is a stator core having a plurality of laminated electrical steel sheets, in which, among a plurality of teeth (121a to 121p) of the stator core, a width of teeth along a direction in which magnetic characteristics are excellent may be narrower than a width of teeth along a direction in which the magnetic characteristics are poor.

公开(公告)号：US20220094218A1

公开(公告)日：2022-03-24

申请号：US17299886

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI ,  Ryu HIRAYAMA ,  Kazutoshi TAKEDA

IPC: H02K1/18 ,  C09J133/08

Abstract: A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, each of the electrical steel sheets includes an annular core back part; a plurality of fastening parts are provided in the core back part at intervals in a circumferential direction; an adhesion region is formed on an outer circumferential side from the fastening parts in the core back part; and a non-adhesion region is formed on an inner circumferential side from the fastening parts in the core back part.

公开(公告)号：US20210091704A1

公开(公告)日：2021-03-25

申请号：US17051658

申请日：2019-07-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI

IPC: H02P27/08

Abstract: A motor can be driven so that the total loss of a loss of a motor and a loss of an inverter decreases. In a relationship between an optimum carrier frequency at which the total loss is minimized and a torque of a motor M, a lowest value of the optimum carrier frequency is derived, and a relationship between the torque of the motor M and the carrier frequency is determined to have a portion in which the carrier frequency is substantially constant or decreases as the torque of the motor M increases in a range equal to or less than the torque of the motor M corresponding to the lowest optimum carrier frequency and a portion in which the carrier frequency is substantially constant or increases as the torque of the motor M increases in a range equal to or more than the torque of the motor M corresponding to the lowest optimum carrier frequency.

公开(公告)号：US20240171024A1

公开(公告)日：2024-05-23

申请号：US18552916

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI ,  Rei HONMA

IPC: H02K1/276

CPC classification number: H02K1/2766

Abstract: A rotor core includes plural holes in which permanent magnets are installed, wherein: at least one of the plural holes includes a first end portion positioned on a leading side in a rotational direction, and a second end portion positioned on a trailing side in the rotational direction; the hole in which the first end portion is open has an inner space and a first outer space that communicates with the inner space, has the first end portion as one end portion of the hole in a left and right direction, and is wider than the inner space; and the first end portion is disposed off-center on the trailing side in the rotational direction relative to a circumferential direction center position of the inner space at the position where the inner space communicates with the first outer space.

公开(公告)号：US20220069640A1

公开(公告)日：2022-03-03

申请号：US17413121

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI ,  Ryu HIRAYAMA ,  Kazutoshi TAKEDA

IPC: H02K1/12

Abstract: A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, the electrical steel sheet includes an annular core back part and a plurality of tooth parts that protrude from the core back part in a radial direction and are disposed at intervals in a circumferential direction of the core back part, a fastening part is provided in a portion of the core back part corresponding to the tooth part, and an adhesion part is provided in the tooth part.

公开(公告)号：US20210273595A1

公开(公告)日：2021-09-02

申请号：US17256067

申请日：2019-09-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo OHSUGI

IPC: H02P27/08 ,  G01R33/12

Abstract: The iron loss of an iron core excited by an inverter power supply is reduced. A modulation operation-setting device 1430 for the inverter power supply controls a maximum value Hmax and a minimum value Hmin of a field intensity H in at least one minor loop such that the loss (iron loss, copper loss, and switching loss) of the entire system is less than the loss of the entire system when an electric device is operated with a target waveform (excluding harmonics).