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    RARE-EARTH MAGNET AND METHOD OF MANUFACTURING THE SAME
    2.
    发明申请
    RARE-EARTH MAGNET AND METHOD OF MANUFACTURING THE SAME 有权

    公开(公告)号：US20220199321A1

    公开(公告)日：2022-06-23

    申请号：US17539491

    申请日：2021-12-01

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  NICHIA CORPORATION

    发明人： Masaaki ITO ,  Daisuke ICHIGOZAKI ,  Noritsugu SAKUMA ,  Akihito KINOSHITA ,  Michiya KUME ,  Hisashi MAEHARA

    IPC分类号： H01F41/02 ,  H01F1/059 ,  B22F3/16 ,  B22F3/24

    摘要： A rare-earth magnet and a method of manufacturing the same are provided. The method includes: preparing Sm-Fe-N magnetic powder; preparing reforming material powder containing metallic zinc; mixing the magnetic powder and the reforming material powder to obtain mixed powder; subjecting the mixed powder to compression molding in a magnetic field to obtain a magnetic-field molded body; subjecting the magnetic-field molded body to pressure sintering to obtain a sintered body; and subjecting the sintered body to heat treatment. A content proportion of the metallic zinc in the reforming material powder is 10 to 30% by mass with respect to the mixed powder. When a temperature and time in conditions for the heat treatment are defined as x° C. and y hours, respectively, the formulas y≥−0.32x+136 and 350≤x≤410 are met.

    RARE EARTH MAGNET AND PRODUCTION METHOD THEREOF
    5.
    发明申请
    RARE EARTH MAGNET AND PRODUCTION METHOD THEREOF 有权

    公开(公告)号：US20230139716A1

    公开(公告)日：2023-05-04

    申请号：US17978688

    申请日：2022-11-01

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  NICHIA CORPORATION

    发明人： Masaaki ITO ,  Motoki HIRAOKA ,  Reimi TABUCHI ,  Hisashi MAEHARA ,  Masanori OKANAN

    IPC分类号： H01F1/059 ,  C22C38/00

    摘要： The present invention is a method for producing a rare earth magnet, including preparing a magnetic powder and a modifier powder, mixing them to obtain a mixed powder, compression-molding the mixed powder in a magnetic field to obtain a magnetic-field molded body, and pressure-sintering the magnetic-field molded body to obtain a sintered body, wherein the magnetic powder includes a first particle group and a second particle group, the D50 values of the first particle group and the second particle group are denoted by d1 μm and d2 μm, respectively, d1 and d2 satisfy the relationship of 0.350≤d2/d1≤0.500, and the ratio between the total volume of the first particle group and the total volume of the second particle group is from 9:1 to 4:1; and a rare earth magnet obtained by the production method.

    MOTOR
    9.
    发明申请
    MOTOR 有权

    公开(公告)号：US20220337108A1

    公开(公告)日：2022-10-20

    申请号：US17659117

    申请日：2022-04-13

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Reimi SAKAGUCHI ,  Daisuke ICHIGOZAKI ,  Masaaki ITO

    IPC分类号： H02K1/276 ,  H02K21/14

    摘要： Provided is a motor capable of increasing a torque while suppressing an increase in the physical size of the motor. A motor includes a rotor. The rotor includes pairs of magnet slots evenly spaced in a circumferential direction, each pair of magnet slots being arranged in a V-shape, pairs of main magnets housed in the pairs of magnet slots, and a plurality of auxiliary magnets including an outer magnet housed in an outer end in the circumferential direction in each of the pairs of magnet slots. The motor satisfies at least one of a first condition that the main magnets are sintered magnets and the auxiliary magnets are bonded magnets, or a second condition that magnetization directions of the main magnet and the outer magnet housed in the same magnet slot intersect outside in the radial direction so as to define an acute angle.

    MOTOR
    10.
    发明申请
    MOTOR 有权

    公开(公告)号：US20220140675A1

    公开(公告)日：2022-05-05

    申请号：US17517169

    申请日：2021-11-02

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Daisuke ICHIGOZAKI ,  Kyoko NAKAMURA ,  Masaaki ITO

    IPC分类号： H02K1/27 ,  H02K15/03

    摘要： Provided is a motor capable of suppressing reduction of the torque of the motor even if the amount of use of the permanent magnets embedded in the rotor core is reduced. A motor includes a rotor with permanent magnets embedded in a rotor core, and a stator positioned on an outer circumference of the rotor. The rotor includes magnetic poles formed around a rotation axis of the rotor, the magnetic poles having the permanent magnets arranged therein. The permanent magnets in adjacent magnetic poles are arranged such that positions of a north pole and a south pole of the permanent magnet in one magnetic pole are inverted from those of the permanent magnet in a magnetic pole adjacent to the one magnetic pole. The permanent magnets each have a residual magnetization that decreases as it moves from the north pole toward the south pole.