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公开(公告)号：US20220216774A1
公开(公告)日：2022-07-07
申请号：US17600397
申请日：2019-07-11
Applicant: Mitsubishi Electric Corporation
Inventor： Masafumi OKAZAKI , Satoru AKUTSU
IPC: H02K15/03 , H02K1/276 , H02K1/2791 , H02K1/28 , H02K7/00
Abstract: Provided is a rotor of a rotating electric machine, including: a rotor core; an end plate provided at an end portion of the rotor core in an axial direction of the rotor core; and a shaft passing through the rotor core and the end plate along the axial direction. The end plate includes: a flat plate portion that has an annular shape and is held in contact with the rotor core; and a warp portion that is formed more on an inner peripheral side of the end plate than the flat plate portion and is held in contact with the shaft. In a radial cross section of the end plate, the warp portion is warped so as to be apart from the rotor core as extending away from the flat plate portion.
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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
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.
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公开(公告)号：US20210234419A1
公开(公告)日：2021-07-29
申请号：US17263962
申请日：2018-11-01
Applicant: Mitsubishi Electric Corporation
Inventor： Masafumi OKAZAKI , Natsumi SUGI , Yu HIROTANI , Akihiko MORI , Satoru AKUTSU
Abstract: In an IPM rotor, a first core sheet has a first sheet hole forming a part of an accommodation hole. The first sheet hole has an edge portion having a flat spring portion which is bent by a magnet through insertion of the magnet into the accommodation hole. A pair of recesses forming a clearance with respect to the magnet are formed at both side portions of the flat spring portion of the edge portion of the first sheet hole. A size of the clearance is set based on a relationship between a magnitude of a pressing force of the flat spring portion on the magnet and variation in pressing force.
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公开(公告)号：US20230246497A1
公开(公告)日：2023-08-03
申请号：US18003361
申请日：2020-08-03
Applicant: Mitsubishi Electric Corporation
Inventor： Mitoru YABE , Junya SUZUKI , Hideya NISHIKAWA , Masafumi OKAZAKI
Abstract: This rotating electrical machine includes: a rotor formed from stacked steel sheets and fixed to a rotary shaft; a plurality of magnets arranged on the outer circumference of the rotor along the circumferential direction; and the same number of holders as the magnets, the holders being arranged between the magnets. The holder is press-fitted and fixed into the rotor by a press-fit portion extending in the radial direction of the rotary shaft. One circumferential-direction side of the magnet is positioned by the rotor, and another side is pressed in the circumferential direction by the holder. Both circumferential-direction ends of the magnet are pressed in the radial direction by the holders. Such a configuration provides a rotating electrical machine that enables a magnet to be accurately fixed to a rotor through simple work, at low cost.
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公开(公告)号：US20180198330A1
公开(公告)日：2018-07-12
申请号：US15575422
申请日：2015-09-30
Applicant: Mitsubishi Electric Corporation
Inventor： Yuji TAKIZAWA , Satoru AKUTSU , Masafumi OKAZAKI , Hiroshi AIDA , Yu HIROTANI , Kazumasa ITO
Abstract: It has been discovered that torque ripples can be reduced by adopting a shape in which: the width of a shoe connection formed in a stator of a permanent magnet motor is equal to or smaller than the thickness of each of core pieces constituting a stator core; and a relationship of 0.7≤Wm/(Tm×Gm)≤3.3 is satisfied, where Wm is the length of the long side of a flat plate-shaped permanent magnet embedded in a rotor, Tm is the length of the short side of the permanent magnet, and Gm is the maximum distance from the outer circumference of the rotor to the permanent magnet.
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Patent Agency Ranking
公开(公告)号：US20230336041A1
公开(公告)日：2023-10-19
申请号：US18012708
申请日：2020-09-09
Applicant: Mitsubishi Electric Corporation
Inventor： Junya SUZUKI , Mitoru YABE , Hideya NISHIKAWA , Masafumi OKAZAKI
Abstract: A rotary electric machine includes a stator, a rotor core provided on an inner circumferential side of the stator and fixed to an output shaft of a rotor, a plurality of magnets arranged in a circumferential direction and fixed to an outer circumferential portion of the rotor core, and a magnet holder fixing the magnets to the outer circumferential portion of the rotor core, the magnet holder includes a base portion through which the output shaft is inserted, and an arm portion connected to the base portion, and the base portion includes an inner circumferential portion having an annular shape, an outer circumferential beam which has an annular shape and is provided on an outer circumferential side of the inner circumferential portion and to which the arm portion is connected, and a connection beam connecting the inner circumferential portion and the outer circumferential beam.
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公开(公告)号：US20220037942A1
公开(公告)日：2022-02-03
申请号：US17276538
申请日：2018-11-27
Applicant: Mitsubishi Electric Corporation
Inventor： Kodai OKAZAKI , Kenta MOTOYOSHI , Yuji TAKIZAWA , Hiroko IKEDA , Hidenori SASAKI , Yu HIROTANI , Satoru AKUTSU , Masafumi OKAZAKI , Natsumi SUGI
Abstract: A rotor core of a rotating electrical machine has interpole bridges each disposed on an outer circumferential side with respect to a permanent magnet in a non-magnetic portion between the poles, and interpole diameter bridges each surrounded by two permanent magnets and an interpole bridge. The outer circumferential surface of each interpole bridge is formed by a first flat surface. Thus, a path of a magnetic flux passing through a magnetic gap is lengthened, so that a q-axis inductance is reduced. In addition, a width in a radial direction of each interpole bridge and a width in a circumferential direction of each interpole diameter bridge are constant, and each interpole bridge and each interpole diameter bridge are disposed so as to be perpendicular to each other to form a T shape. Thus, the concentration of stress during press-fitting of the permanent magnet into a magnet hole can be reduced.
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公开(公告)号：US20210075305A1
公开(公告)日：2021-03-11
申请号：US16961959
申请日：2018-02-28
Applicant: Mitsubishi Electric Corporation
Inventor： Yuji TAKIZAWA , Hiroko IKEDA , Shinichi YAMAGUCHI , Yu HIROTANI , Masafumi OKAZAKI , Satoru AKUTSU
Abstract: A permanent magnet motor includes a rotor having a field pole of a rotor core, wherein the field pole has a radius smaller than an arc centered on a shaft of the rotor, a multiple of slits are formed in the field pole, the multiple of slits are disposed so that an interval between a first central line positioned between a multiple of the slits and a second central line positioned between a neighboring multiple of the slits increases as the first central line and the second central line head toward an outer peripheral side of the rotor core, and of the multiple of slits of the field pole, a first slit disposed in a central position of the field pole, and a second slit and a third slit disposed on either side of the first slit, are disposed within 20% of a circumferential direction width of the permanent magnet.
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公开(公告)号：US20200036244A1
公开(公告)日：2020-01-30
申请号：US16496502
申请日：2017-04-12
Applicant: Mitsubishi Electric Corporation
Inventor： Hiroshi AIDA , Masafumi OKAZAKI , Yuji TAKIZAWA , Satoru AKUTSU , Hideya NISHIKAWA , Akihiko MORI
IPC: H02K1/27
Abstract: According to the present invention, provided is an IPM rotor of the present invention, which includes a plurality of core sheets, having hole portions configured to accommodate magnets and being laminated on one another, and the magnets are inserted in the hole portions. The IPM rotor includes a first core sheet having a spring plate portion provided to the hole portion, and a second core sheet having a recessed portion provided the hole portion. A protruding portion is provided to the hole portion of at least one of the plurality of the laminated core sheets. The protruding portion is provided to at least one of the hole portion of the first core sheet, the hole portion of the second core sheet, or a hole portion of a third core sheet to be further arranged.
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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
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.
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