公开(公告)号：US20220029512A1

公开(公告)日：2022-01-27

申请号：US17296546

申请日：2019-08-21

Applicant: Mitsubishi Electric Corporation

Inventor： Yuki HIDAKA ,  Shohei FUJIKURA ,  Taiga KOMATSU ,  Tatsuro HINO

IPC: H02K21/04

Abstract: Provided is a rotor for a rotating electric machine, which enables suppression of a reduction in output of a rotating electric machine. The rotor for a rotating electric machine includes: a rotor core having winding-portion insertion holes and magnet insertion holes; rotor winding portions inserted into the winding-portion insertion holes; and rotor permanent magnets inserted into the magnet insertion holes, wherein each of the rotor winding portions includes: a non-magnet portion; and a rotor winding provided to the non-magnet portion, wherein each of the non-magnet portions is fixed to the rotor core, and wherein the rotor windings are fixed to the rotor core through intermediation of the non-magnet portions.

公开(公告)号：US20240235294A9

公开(公告)日：2024-07-11

申请号：US18277317

申请日：2021-02-26

Applicant: Mitsubishi Electric Corporation

Inventor： Hidenori SASAKI ,  Kenta MOTOYOSHI ,  Yu HIROTANI ,  Hiroko IKEDA ,  Shohei FUJIKURA

IPC: H02K1/278

CPC classification number: H02K1/278 ,  H02K2213/03

Abstract: A rotating electrical machine includes a stator and a rotor, the rotor includes a rotor core and a plurality of magnetic poles, the plurality of magnetic poles includes a plurality of magnet poles formed by permanent magnets, and a plurality of dummy poles, the magnet poles and the dummy poles are alternately disposed in both an axial direction and a circumferential direction, non-magnetic holes are provided between the magnet poles and the dummy poles that are adjacent in the axial direction, and when a length of each magnet pole in the axial direction is tm, a length of each dummy pole in the axial direction is tc, a length of each non-magnetic hole in the axial direction is ta, and a length of the rotor core in the axial direction is lc, the rotating electrical machine satisfies tm>tc and lc

公开(公告)号：US20240429760A1

公开(公告)日：2024-12-26

申请号：US18697514

申请日：2021-10-20

Applicant: Mitsubishi Electric Corporation

Inventor： Takashi YAMAMOTO ,  Masafumi OKAZAKI ,  Satoru AKUTSU ,  Shohei FUJIKURA ,  Kenta MOTOYOSHI

IPC: H02K1/278 ,  B62D5/04 ,  H02K29/03

Abstract: A rotor according the present disclosure includes: a shaft a first rotor core and a second rotor core a plurality of first magnets that are disposed so as to align in a circumferential direction on an outer circumferential surface of the first rotor core, and a plurality of second magnets that are disposed so as to align in the circumferential direction on the outer circumferential surface of the second rotor core, wherein locations of the plurality of first magnets and the plurality of second magnets are offset in the circumferential direction, and an interval between the plurality of first magnets and the plurality of second magnets in the axial direction is within a range of 0.5 to 3.0 mm.

公开(公告)号：US20240136874A1

公开(公告)日：2024-04-25

申请号：US18277317

申请日：2021-02-26

Applicant: Mitsubishi Electric Corporation

Inventor： Hidenori SASAKI ,  Kenta MOTOYOSHI ,  Yu HIROTANI ,  Hiroko IKEDA ,  Shohei FUJIKURA

IPC: H02K1/278

CPC classification number: H02K1/278 ,  H02K2213/03

Abstract: A rotating electrical machine includes a stator and a rotor, the rotor includes a rotor core and a plurality of magnetic poles, the plurality of magnetic poles includes a plurality of magnet poles formed by permanent magnets, and a plurality of dummy poles, the magnet poles and the dummy poles are alternately disposed in both an axial direction and a circumferential direction, non-magnetic holes are provided between the magnet poles and the dummy poles that are adjacent in the axial direction, and when a length of each magnet pole in the axial direction is tm, a length of each dummy pole in the axial direction is tc, a length of each non-magnetic hole in the axial direction is ta, and a length of the rotor core in the axial direction is lc, the rotating electrical machine satisfies tm>tc and lc

公开(公告)号：US20220158582A1

公开(公告)日：2022-05-19

申请号：US17435702

申请日：2019-03-15

Applicant: Mitsubishi Electric Corporation

Inventor： Shohei FUJIKURA ,  Taiga KOMATSU ,  Hiroyuki HIGASHINO ,  Yuki HIDAKA

IPC: H02P29/60 ,  G01K13/00 ,  G01K3/14 ,  G01N25/18 ,  G01N25/20

Abstract: A control device that can prevent the deterioration of temperature estimation accuracy in a rotating electric machine due to its aging deterioration is provided. The control device (10) includes a correction unit (13) to correct at least one of thermal resistance, heat generation, and thermal capacity, which are physical quantities to build a thermal circuit model (30-1) covering a thermal circuit of a rotating electric machine (1), wherein the correction unit (13) corrects at least one of the thermal resistance, the heat generation, and the thermal capacity at a measurement position by using measurement information including temperature (T31) or thermal flow (U32) measured by a sensing unit (8) at the measurement position in the rotating electric machine (1).

公开(公告)号：US20230378832A1

公开(公告)日：2023-11-23

申请号：US18030825

申请日：2020-10-27

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Yu HIROTANI ,  Kenta MOTOYOSHI ,  Hiroko IKEDA ,  Shohei FUJIKURA

IPC: H02K1/278 ,  H02K1/02 ,  H02K16/02

CPC classification number: H02K1/278 ,  H02K1/02 ,  H02K16/02 ,  H02K2213/03 ,  H02K2201/03

Abstract: In an electric rotating machine according to this application, a maximum height of a permanent magnet in a rotor and a flange-part root radial thickness of the tooth portion in the stator can be set properly, so that it is possible to eliminate unbalanced magnetic saturation at flange parts of the heads of the tooth portions. This makes it possible to reduce an unbalance between torque ripples that are generated respectively by an upper-side rotor block and a lower-side rotor block when an electric power steering apparatus is driven under static steering conditions, to thereby achieve an electric rotating machine with a suppressed torque ripple. With the use of this electric rotating machine, since the torque-ripple unbalance is reduced, it is possible to achieve an electric power steering apparatus with a suppressed torque ripple.

公开(公告)号：US20230208225A1

公开(公告)日：2023-06-29

申请号：US17927741

申请日：2020-08-20

Applicant: Mitsubishi Electric Corporation

Inventor： Hidenori SASAKI ,  Kenta MOTOYOSHI ,  Shohei FUJIKURA ,  Hiroko IKEDA ,  Koji KAWAMURA

IPC: H02K1/278 ,  H02K1/28 ,  H02K7/00

CPC classification number: H02K1/278 ,  H02K1/28 ,  H02K7/003

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core and a plurality of permanent magnets. The rotor core includes a plurality of core portions. The rotor core includes an annular portion and a plurality of coupling portions. Each of the plurality of coupling portions couples the annular portion and a first core portion of each of the plurality of core portions to each other. Each of the plurality of coupling portions has at least one coupling path. A sum of a width of a portion having the smallest width in at least one coupling path is smaller than a length of a joining boundary between the annular portion and each of the plurality of coupling portions.

公开(公告)号：US20220200374A1

公开(公告)日：2022-06-23

申请号：US17432093

申请日：2019-04-10

Applicant: Mitsubishi Electric Corporation

Inventor： Yuki HIDAKA ,  Hideaki ARITA ,  Taiga KOMATSU ,  Shohei FUJIKURA

IPC: H02K1/22 ,  H02K11/21 ,  H02K1/276

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core, an axial end part, and a rotor magnet inserted into an insertion hole formed so as to pass through the rotor core. The axial end part has a recessed portion. The rotor magnet includes a first side surface and a second side surface. The first side surface is fixed to a first inner wall surface of the insertion hole. In a cross section perpendicular to the axial direction, a width of the first inner wall surface is larger than a width of the first side surface. The second side surface is fixed to a second inner wall surface of the recessed portion. In the cross section perpendicular to the axial direction, a width of the second inner wall surface is larger than a width of the second side surface.

公开(公告)号：US20240356394A1

公开(公告)日：2024-10-24

申请号：US18687603

申请日：2021-10-29

Applicant: Mitsubishi Electric Corporation

Inventor： Kenta MOTOYOSHI ,  Hiroko IKEDA ,  Yuki NISHIMURA ,  Takashi Takashi ,  Masafumi OKAZAKI ,  Shohei FUJIKURA

IPC: H02K1/27 ,  H02K1/14

CPC classification number: H02K1/27 ,  H02K1/14

Abstract: A rotor includes a rotor core, a shaft which is disposed inside the rotor core and extends in an axial direction, and a plurality of permanent magnets which are provided in the rotor core, in which the rotor core is provided with a lightening hole, and a number of the lightening hole is different from a number of pole pairs of the plurality of permanent magnets.

公开(公告)号：US20240159572A1

公开(公告)日：2024-05-16

申请号：US18282609

申请日：2021-04-15

Applicant: Mitsubishi Electric Corporation

Inventor： Hiroko IKEDA ,  Shohei FUJIKURA ,  Kenta MOTOYOSHI ,  Yu HIROTANI ,  Hidenori SASAKI ,  Tatsuya MORI

IPC: G01D5/20

CPC classification number: G01D5/2053

Abstract: A resolver includes a rotor attached to a shaft of a rotating body, a stator, an excitation circuit, and an angle computation unit configured to compute a rotation angle of the rotor. Each tooth of the stator has line-symmetry with respect to a line connecting a center of a core back of the stator and centers of the teeth in a circumferential direction as viewed from an axial direction. A rotor outline is expressed by a function Rr(x(θ), y(θ)) defined by Equations (1) to (3), where an x and a y axes are axes of an orthogonal coordinate system having a center of the shaft as an origin, and an angle from a reference axis is θ, where a minimum distance from the center of the core back to the teeth is Ri, and a maximum distance is Ro, and a number of salient poles of the rotor is Nx.