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：US11824411B2

公开(公告)日：2023-11-21

申请号：US17456531

申请日：2021-11-24

Applicant: Hunan University of Science and Technology

Inventor： Xiaoping Zhang ,  Donghao Liu ,  Bo Fu

IPC: H02K29/03 ,  H02K1/16

CPC classification number: H02K29/03 ,  H02K1/165 ,  H02K2201/03 ,  H02K2213/03

Abstract: To solve the problem of large electromagnetic noise in AC traction motor, embodiments have open square notches at symmetrical positions on both sides of stator teeth of AC traction motor to effectively reduce electromagnetic noise without affecting other performance indicators of motor. In addition, embodiments fit the functional relationship between the optimal notch size or optimal slotting position size of motors and their power by determining the optimal notch size or optimal slotting position size of motors with different power grades, so as to achieve the noise reduction effect.

公开(公告)号：US20230268805A1

公开(公告)日：2023-08-24

申请号：US18110985

申请日：2023-02-17

Applicant: Siemens Aktiengesellschaft

Inventor： Tobias BINKERT

IPC: H02K11/20 ,  H02K41/02

CPC classification number: H02K11/20 ,  H02K41/02 ,  H02K2201/03 ,  H02K2213/03

Abstract: A method for determining an air gap between a transport rotor and a stator segment, wherein an acceleration run of the transport rotor is performed and, here, the present stator current is measured and actual speed values are determined, from which a change in speed per time unit is determined, and from which an acceleration is determined, where the present propulsion force is determined from the product of the force constant and the present stator current, where the present propulsion force and the acceleration are used to determine a virtual mass of the transport rotor, and where for a statement about the currently prevailing air gap a relationship between an increase in the virtual mass and an enlargement of the air gap is used and a size value for the air gap is calculated therefrom.

公开(公告)号：US11735966B2

公开(公告)日：2023-08-22

申请号：US17246647

申请日：2021-05-02

Applicant: WOLONG ELECTRIC GROUP CO., LTD. ,  ZHEJIANG LONGCHUANG MOTOR TECHNOLOGY INNOVATION CO., LTD. ,  WOLONG ELECTRIC (SHANGHAI) CENTRAL RESEARCH INSTITUTE CO., LTD.

Inventor： Freddy Gyllensten ,  Youyao Du ,  George Gao ,  Yue Gao ,  Lijun Liu ,  Chunzhi Deng ,  Bin Lu ,  Zhongqi Liu

IPC: H02K1/27 ,  H02K1/28 ,  H02K1/278 ,  H02K21/14

CPC classification number: H02K1/278 ,  H02K1/28 ,  H02K21/14 ,  H02K2201/03

Abstract: A surface-mounted high-speed permanent magnet synchronous rotor includes a rotor shaft, multiple permanent magnet sets, multiple silicon steel piece sets and a rotor iron core sleeve. The multiple permanent magnet sets and the multiple silicon steel piece sets are glued on a surface of the rotor shaft along an axis of the rotor shaft. The multiple permanent magnet sets and the multiple silicon steel piece sets are spaced around the rotor shaft. The multiple permanent magnet sets have a same outer diameter as the multiple silicon steel piece sets, and the multiple permanent magnet sets and the multiple silicon steel piece sets are sleeved with the rotor iron core sleeve.

公开(公告)号：US20180269739A1

公开(公告)日：2018-09-20

申请号：US15761369

申请日：2016-09-07

Applicant: Siemens Aktiengesellschaft

Inventor： Frank Brasas ,  ROBERT GRUBER ,  MARTIN KROMPASS ,  OLIVER MEMMINGER ,  KLAUS SCHIFFERER ,  TOBIAS SPERL ,  ROLAND ZEICHFÜSSL

IPC: H02K1/32 ,  F03D9/25 ,  F03D80/60 ,  H02K1/20 ,  H02K9/02

CPC classification number: H02K1/32 ,  F03D9/25 ,  F03D80/60 ,  H02K1/20 ,  H02K9/02 ,  H02K2201/03 ,  H02K2201/15 ,  Y02E10/725

Abstract: An electrical machine includes a first active part and a second active part. Both the first active part and the second active part have a plurality of laminated sub-cores, with each laminated sub-core having a plurality of individual laminations. Each lamination is defined by an axial width. The laminated sub-cores are mutually spaced in an axial direction such that a respective radial cooling slot is formed between two adjacent laminated sub-cores. The radial cooling slots in the first active part are offset in the axial direction in relation to one another in comparison to the radial cooling slots in the second active part, and the sum of the axial widths of all individual laminations in the first active part corresponds to the sum of the axial widths of all individual laminations in the second active part.

公开(公告)号：US20180170581A1

公开(公告)日：2018-06-21

申请号：US15568581

申请日：2016-03-15

Applicant: TSINGHUA UNIVERSITY ,  BEIJING U-PRECISION TECH CO., LTD.

Inventor： Ming ZHANG ,  Yu ZHU ,  Anlin CHEN ,  Kaiming YANG ,  Rong CHENG ,  Feng LIU ,  Jinchun HU ,  Chuxiong HU ,  Dengfeng XU ,  Haihua MU

IPC: B64G1/24 ,  H02K16/00 ,  H02N15/00

CPC classification number: B64G1/24 ,  B64G1/283 ,  G05D1/08 ,  H02K16/00 ,  H02K2201/03 ,  H02N15/00

Abstract: A magnetic levitation reaction sphere includes a spherical-housing-shaped rotor and three groups of stators. Each group includes two stators using the sphere center of the rotor as a symcenter. Axes of the three groups are mutually orthogonal. Each stator comprises a stator core and a coil array. An air gap is reserved between an inner surface of each stator core and the outer surface of the rotor. Through grooves are radially formed in the stator cores. The coil arrays are disc-type motor stator windings. Two effective sides of each coil in each coil array are respectively placed in two through grooves of the corresponding stator core. The magnetic levitation reaction sphere has low cost; levitation and rotation driving are integrated; the magnetic levitation reaction sphere has a simple and compact structure, a small size and a low mass, and relates to inherent stable levitation; and the levitation control is simple.

公开(公告)号：US20180159407A1

公开(公告)日：2018-06-07

申请号：US15891916

申请日：2018-02-08

Applicant: MINEBEA MITSUMI Inc.

Inventor： Fumitoshi YAMASHITA ,  Osamu YAMADA ,  Shiho OHYA ,  Akihiro YAMANE

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

CPC classification number: H02K15/03 ,  H02K1/02 ,  H02K1/278 ,  H02K29/03 ,  H02K2201/03 ,  H02K2213/03

Abstract: A motor includes poles P having a remanence Mr of 0.9 T or more, a coercivity HcJ of 0.80 MA/m or more, and a maximum energy product (BH)max of 150 kJ/m3 or more, which sets a center point Pc of the magnetic poles in a circumferential direction on a rotor outer circumferential surface to a maximum thickness tmax, wherein when a line connecting the Pc and a rotational axis center Rc is Pc-Rc, a straight line connecting an arbitrary point Px in the circumferential direction on the rotor outer circumferential surface and the Rc is Px-Rc, an apex angle of the lines Pc-Rc and Px-Rc is θ, a number of pole pairs is Pn, a circumferential direction magnetic pole end is Pe, and a magnetic pole end biasing distance ΔLPe of the circumferential direction magnetic pole ends Pe is α×tmax (α is a coefficient).

公开(公告)号：US09991771B2

公开(公告)日：2018-06-05

申请号：US14534112

申请日：2014-11-05

Applicant: University of Maryland, Baltimore County

Inventor： Weidong Zhu ,  Navid Goudarzi ,  Xuefeng Wang

IPC: H02P3/00 ,  H02P9/06 ,  H02P15/00 ,  H02K21/02 ,  F03D7/02 ,  H02K21/24 ,  B60L15/20 ,  H02K5/16 ,  H02K7/08 ,  H02P9/00 ,  H02K7/18

CPC classification number: H02K21/024 ,  B60L15/2009 ,  B60L2220/50 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2270/145 ,  F03D7/0272 ,  H02K7/1838 ,  H02K21/24 ,  H02K2201/03 ,  H02K2213/09 ,  H02P9/00 ,  Y02E10/723 ,  Y02T10/641 ,  Y02T10/645 ,  Y02T10/7275

Abstract: This invention relates to an active control system for a variable electromotive-force generator (VEG) for use in wind turbines, ships, hybrid vehicles, and related applications.

公开(公告)号：US20180145565A1

公开(公告)日：2018-05-24

申请号：US15356629

申请日：2016-11-20

Applicant: Michael Pozmantir ,  Sergey Pozmantir

Inventor： Michael Pozmantir ,  Sergey Pozmantir

IPC: H02K11/215 ,  H02K1/02 ,  H02K1/14 ,  H02K1/27 ,  H02K3/28 ,  H02K7/14 ,  H02K11/33 ,  F04D19/00 ,  F04D25/06

CPC classification number: H02K11/215 ,  F04D19/002 ,  F04D25/0646 ,  F04D25/068 ,  F04D25/08 ,  H02K1/02 ,  H02K1/146 ,  H02K1/2706 ,  H02K1/2786 ,  H02K3/28 ,  H02K7/14 ,  H02K11/33 ,  H02K21/16 ,  H02K21/222 ,  H02K2201/03 ,  H02P1/00

Abstract: A brushless DC motor utilizing a single pole double throw reed switch as a rotor position sensor. In one embodiment, the motor has a four-pole internal stator with bifilar windings providing alternating polarization for each subsequent pole, and a hollow outer rotor with radially magnetized ring-shaped permanent magnet. The rotor magnet has magnetically uninterrupted four-pole torque generating surface and incorporates features to interact with the reed switch. A non-uniform air gap between the stator poles and an inner surface of the rotor magnet allows generating a complementary reluctance torque between the energization pulses. The motor includes means to limit the electric current through the reed switch.

公开(公告)号：US20180083522A1

公开(公告)日：2018-03-22

申请号：US15558819

申请日：2016-01-15

Applicant: Parker-Hannifin Corporation

Inventor： Steven Roger HUARD

IPC: H02K41/03 ,  H02K41/025

CPC classification number: H02K41/031 ,  H02K29/03 ,  H02K41/025 ,  H02K2201/03

Abstract: A linear motor includes a forcer having a plurality of teeth spaced apart along a longitudinal axis of the forcer. At least some teeth arranged about a longitudinal center of the forcer are dimensioned different from at least some other teeth arranged at ends of the forcer distal from the longitudinal center. The teeth may be dimensioned to define a pocket relative to the longitudinal axis of the forcer.