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公开(公告)号：US20180226851A1
公开(公告)日：2018-08-09
申请号：US15944872
申请日：2018-04-04
Applicant: Nidec Corporation
Inventor： Tatsuro KAWAMOTO , Takayuki MIGITA , Takao ATARASHI , Yasuaki NAKAHARA
IPC: H02K1/27
CPC classification number: H02K1/2773 , H02K1/272 , H02K1/274 , H02K15/03 , H02K2213/03
Abstract: A motor may include a rotor including a shaft; a stator; and a bearing supporting the shaft. The rotor may include a plurality of core pieces on an outer side of the shaft, a plurality of permanent magnets, a mold resin part between the core pieces, and an interposed part in contact with a surface on one side in a circumferential direction of each of the core pieces. The neighboring core pieces may include a magnet insertion hole provided therebetween. The permanent magnet may include two poles, with poles of neighboring magnets facing each other having identical polarity. Each of the permanent magnets is in indirect contact with the core piece positioned on the other side in the circumferential direction of the magnet insertion hole via the interposed part.
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公开(公告)号：US20220209626A1
公开(公告)日：2022-06-30
申请号：US17697867
申请日：2022-03-17
Applicant: NIDEC CORPORATION
Inventor： Yuki ISHIKAWA , Takayuki MIGITA , Shuhei NAKAMATSU
Abstract: One aspect of a motor of the present disclosure may include a rotor having a motor shaft disposed along a central axis extending in one direction, a stator facing the rotor via a gap in a radial direction, and a housing having an accommodating portion configured to accommodate the rotor and the stator, and to enable oil to be stored therein, wherein the housing comprises a lower wall portion facing a vertical-directional lower region in the inside of the accommodating portion, the lower wall portion comprises a cooling flow passage formed therein, and refrigerant flows in the cooling flow passage, and at least a portion of the cooling flow passage overlaps the vertical-directional lower region in the inside of the accommodating portion when viewed along a vertical direction.
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公开(公告)号：US20210288550A1
公开(公告)日：2021-09-16
申请号：US16323934
申请日：2017-08-07
Applicant: Nidec Corporation
Inventor： Yuki ISHIKAWA , Yasuo YAMAGUCHI , Takayuki MIGITA
Abstract: A motor unit includes a motor including a rotor to rotate about a motor axis, a reduction gear including an intermediate gear to rotate about an intermediate axis and connected to the motor, a differential including a ring gear to rotate about a differential axis and connected to the reduction gear, a housing including a housing space to house the motor, the reduction gear, and the differential, oil in a vertically lower region of the housing space, and an oil passage to lead the oil from the vertically lower region of the housing space to be fed to the motor. The housing includes a ceiling portion directly above the reduction gear and the differential. At least a portion of the ring gear is lower than a liquid surface of the oil in the vertically lower region of the housing space. The motor axis, the intermediate axis, and the differential axis extend in parallel with one another along a horizontal direction. Each of the intermediate axis and the differential axis is lower than the motor axis. The ceiling portion is substantially parallel to an imaginary line imaginarily joining the motor axis and the differential axis when viewed in an axial direction of the motor axis.
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公开(公告)号：US20190386535A1
公开(公告)日：2019-12-19
申请号：US16479289
申请日：2018-01-06
Applicant: NIDEC CORPORATION
Inventor： Takashi SHIRAISHI , Takayuki MIGITA , Hisashi FUJIHARA , Masato AONO , Shuhei NAKAMATSU
Abstract: A stator includes a stator core disposed about a central axis and covered by an insulator, coils installed on the stator core through the insulator, and an intermediate bus bar electrically connected to a portion of a conducting wire constituting the coils. A method of manufacturing a stator includes a mounting process, a winding process, and a connecting process. An intermediate bus bar is supported at a first position spaced apart from a coil in an axial direction in a mounting portion before the start of the winding process. The intermediate bus bar is fixed at a second position between the first position and the coils in the axial direction after the completion of the winding process.
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公开(公告)号：US20190356183A1
公开(公告)日：2019-11-21
申请号：US16474231
申请日：2017-12-22
Applicant: Nidec Corporation
Inventor： Hideyuki KINJO , Takayuki MIGITA
Abstract: A rotor includes a rotor core having a cylindrical shape with a central axis as a center thereof and magnets arranged in a circumferential direction. The rotor core includes an inner side core portion positioned farther inward than the magnet in a radial direction, a first outer side core portion positioned farther outward than the magnet in the radial direction and disposed on a first side in an axial direction, and a second outer side core portion positioned farther outward than the magnet in the radial direction and disposed on a second other side in the axial direction. A distance between the central axis and an outer side surface of the first outer side core portion changes in the circumferential direction, a distance between the central axis and an outer side surface of the second outer side core portion changes in the circumferential direction. In a plan view, a first top portion positioned at an outermost position of the first outer side core portion in the radial direction and a second top portion positioned at an outermost position of the second outer side core portion in the radial direction are located at positions different from each other in the circumferential direction.
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Patent Agency Ranking
26.发明申请公开(公告)号：US20190214889A1
公开(公告)日：2019-07-11
申请号：US16325435
申请日：2017-09-29
Applicant: Nidec Corporation
Inventor： Takayuki MIGITA , Takeshi HONDA , Hirofumi MUTO , Osamu FUJIMOTO , Hiroshi KITAGAKI , Yasuaki NAKAHARA
CPC classification number: H02K15/0043 , H02K1/22 , H02K1/27 , H02K1/2773 , H02K15/0068 , H02K15/02
Abstract: A rotor core includes laminate steel plates extending in a radial direction with respect to a central axis. The laminate steel plates each include a base portion on a radially outer side of the central axis, and pieces separately disposed on a radially outer side of the base portion with penetrating portions therebetween, and arranged side by side at predetermined intervals in a circumferential direction. The laminate steel plates are laminated in an axial direction. The laminated steel plate at an upper end in the axial direction includes at least one of an outward projection extending radially outward from an outer edge portion of the base portion and an inward projection extending radially inward from an inner edge portion of the piece, and the laminated steel plate at a lower end in the axial direction includes an intervening portion between the base portion and the piece portion.
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公开(公告)号：US20190214866A1
公开(公告)日：2019-07-11
申请号：US16325437
申请日：2017-09-29
Applicant: Nidec Corporation
Inventor： Takayuki MIGITA , Takeshi HONDA , Hirofumi MUTO , Osamu FUJIMOTO , Hiroshi KITAGAKI , Yasuaki NAKAHARA
Abstract: A rotor includes a rotor core in which laminate steel plates extending in a radial direction with respect to a central axis are laminated in an axial direction, and magnets are inserted into the rotor core. Each of the laminate steel plates includes a base portion positioned on a radially outer side of the central axis, and pieces separately disposed on a radially outer side of the base portion with penetrating portions therebetween, and arranged side by side at predetermined intervals in a circumferential direction. The magnets are inserted into the penetrating portions and arranged side by side at predetermined intervals in the circumferential direction. Space portions are provided between the magnets adjacent to each other in the circumferential direction. A circumferential length of the pieces is shorter than a circumferential length of the magnets.
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公开(公告)号：US20190190326A1
公开(公告)日：2019-06-20
申请号：US16282473
申请日：2019-02-22
Applicant: Nidec Corporation
Inventor： Yasuaki NAKAHARA , Takayuki MIGITA , Hiroshi KITAGAKI , Takeshi HONDA , Hisashi FUJIHARA
CPC classification number: H02K1/148 , H02K1/18 , H02K15/02 , H02K15/022
Abstract: A stator includes a core with an annular shape including a center that is a vertically extending central axis. The core includes core pieces in which first and second laminate members are laminated. The first laminate member includes a first tooth portion extending in a radial direction and a first core back portion extending in a circumferential direction. The first core back portion includes a first protrusion on one side thereof in the circumferential direction and a first recess on the other side thereof in the circumferential direction. The second laminate member includes a second tooth portion extending in a radial direction and a second core back portion extending in a circumferential direction. The second core back portion includes a second recess on one side thereof in the circumferential direction and a second protrusion on the other side thereof in the circumferential direction. In the first protrusion, the one side in the circumferential direction is thicker in a lamination direction than the other side in the circumferential direction, and in the second protrusion, the other side in the circumferential direction is thicker in the lamination direction than the one side in the circumferential direction.
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公开(公告)号：US20190173352A1
公开(公告)日：2019-06-06
申请号：US16323930
申请日：2017-08-07
Applicant: Nidec Corporation
Inventor： Yasuo YAMAGUCHI , Takayuki MIGITA , Yuki ISHIKAWA
Abstract: A motor unit includes a motor, a housing including a housing space to house the motor, oil in a vertically lower region of the housing space, and an oil passage to lead the oil from the vertically lower region of the housing space through the motor to the vertically lower region of the housing space. The oil passage includes a first oil passage extending through an inside of the motor, and a second oil passage extending through an outside of the motor. One of the first oil passage and the second oil passage is includes a cooler to cool the oil therein.
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公开(公告)号：US20190068009A1
公开(公告)日：2019-02-28
申请号：US16170170
申请日：2018-10-25
Applicant: Nidec Corporation
Inventor： Yasuaki NAKAHARA , Takayuki MIGITA , Hiroshi KITAGAKI , Takeshi HONDA , Hisashi FUJIHARA
Abstract: A stator includes an annular core including a central axis. The core includes core pieces including first and second laminate members. The first laminate member includes a first tooth portion extending in a radial direction, and a first core back portion connected to the first tooth portion and extending in a circumferential direction. The second laminate member includes a second tooth portion extending in a radial direction, and a second core back portion connected to the second tooth portion and extending in a circumferential direction. Positions of circumferential ends of the first core back portion are different from positions of circumferential ends of the second core back. The first core back portion includes a first protrusion on one side thereof in the first circumferential direction. The first protrusion is in contact with one of the core pieces adjacent thereto at one point.
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