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公开(公告)号：US20210012934A1
公开(公告)日：2021-01-14
申请号：US17024033
申请日：2020-09-17
发明人： Kenichi FUJIKAWA , Takashi YAMAMOTO , Hirofumi EBE , Makoto FUJIHARA , Eiichi IMOTO , Tomohiro OMURE
IPC分类号： H01F1/053 , H01F7/02 , H01F1/057 , B22F1/00 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/12 , C22C38/16
摘要： Provided are: a sintered body that forms a rare-earth magnet and is configured in a manner such that the divergence between the orientation angles of the easy axes of magnetization of magnet material particles and the orientation axis angle of the magnet material particles is kept within a prescribed range in an arbitrary micro-section of a magnet cross-section; and a rare-earth sintered magnet. This sintered body for forming a rare-earth magnet has two or more different regions exhibiting an orientation axis angle of at least 20°, given that the orientation axis angle is defined as the highest-frequency orientation angle among the orientation angles of the easy magnetization axes, relative to a pre-set reference line, of a plurality of magnet material particles in a rectangular section at an arbitrary position in a plane including the thickness direction and the widthwise direction.
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公开(公告)号：US20190221339A1
公开(公告)日：2019-07-18
申请号：US16336038
申请日：2017-09-22
发明人： Hirofumi EBE , Izumi OZEKI , Takashi YAMAMOTO , Kenichi FUJIKAWA
IPC分类号： H01F1/08 , H02K1/02 , H01F41/02 , B22F3/15 , C22C38/00 , C22C38/16 , C22C38/12 , C22C38/10 , C22C38/06
CPC分类号： H01F1/086 , B22F3/00 , B22F3/02 , B22F3/10 , B22F3/15 , B22F2301/355 , C22C38/00 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/12 , C22C38/16 , C22C2202/02 , H01F1/057 , H01F41/02 , H01F41/0266 , H02K1/02 , H02K15/03
摘要： Provided are: a method for manufacturing a sintered body as a base of a sintered magnet and a method for manufacturing a permanent magnet. Specifically, a magnet raw material is pulverized into magnet powder, the magnet powder pulverized and a binder are mixed, thereby to form a compound. The, a formed body, obtained by forming the compound formed, is sintered by heating up the same to a firing temperature in a pressed state at a predetermined heat-up rate, and by keeping the same at the firing temperature. In the sintering step, the pressure value for pressing the formed body is set to: less than 3 MPa from the start of heating up of the formed body to a predetermined timing during heating up of the formed body; and 3 MPa or more after the timing.
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公开(公告)号：US20180108464A1
公开(公告)日：2018-04-19
申请号：US15559654
申请日：2016-03-24
发明人： Kenichi FUJIKAWA , Takashi YAMAMOTO , Hirofumi EBE , Makoto FUJIHARA , Eiichi IMOTO , Tomohiro OMURE
CPC分类号： H01F1/0536 , B22F1/0062 , B22F2301/355 , B22F2304/10 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/12 , C22C38/16 , H01F1/0577 , H01F7/02 , H01F41/0273
摘要： Provided are: a sintered body that forms a rare-earth magnet and is configured in a manner such that the divergence between the orientation angles of the easy axes of magnetization of magnet material particles and the orientation axis angle of the magnet material particles is kept within a prescribed range in an arbitrary micro-section of a magnet cross-section; and a rare-earth sintered magnet. This sintered body for forming a rare-earth magnet has two or more different regions exhibiting an orientation axis angle of at least 20°, given that the orientation axis angle is defined as the highest-frequency orientation angle among the orientation angles of the easy magnetization axes, relative to a pre-set reference line, of a plurality of magnet material particles in a rectangular section at an arbitrary position in a plane including the thickness direction and the widthwise direction.
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4.发明申请公开(公告)号：US20170170695A1
公开(公告)日：2017-06-15
申请号：US15118144
申请日：2014-02-12
发明人： Takashi YAMAMOTO , Katsuya KUME , Toshiaki OKUNO , Izumi OZEKI , Tomohiro OMURE , Takashi OZAKI , Keisuke TAIHAKU
IPC分类号： H02K1/27 , H01F1/08 , H01F41/02 , B22F3/14 , B22D7/00 , B22F9/04 , B22F3/16 , B22F5/00 , H02K15/03 , C22C38/00
CPC分类号： H02K1/2706 , B22D7/00 , B22F3/14 , B22F3/16 , B22F5/006 , B22F5/106 , B22F9/04 , B22F2009/044 , B22F2301/355 , B22F2998/10 , B22F2999/00 , C22C38/002 , C22C38/005 , C22C2202/02 , H01F1/086 , H01F41/0246 , H01F41/0273 , H02K1/2733 , H02K15/03 , B22F3/22 , B22F3/02 , B22F3/10 , B22F2202/05
摘要： Provided are: a ring magnet for an SPM motor with which high output power, high efficiency, and low torque ripple of the SPM motor can be realized; a method for manufacturing a ring magnet for an SPM motor; an SPM motor using a ring magnet for an SPM motor; and a method for manufacturing an SPM motor. Raw material magnet is milled to magnet powder, and the magnet powder is molded to a shape of a sheet thereby forming a green sheet. Then, a magnetic field is applied to the green sheet to perform magnetic field orientation. Further, with fixing plural green sheets after the magnetic field orientation by lamination under deformed state thereof, the plural laminated green sheets are cut to a fan-like shape, which is then followed by connecting with each other to form a ring shape and further followed by sintering to produce a permanent magnet.
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公开(公告)号：US20170169922A1
公开(公告)日：2017-06-15
申请号：US15118117
申请日：2014-02-12
发明人： Takashi OZAKI , Katsuya KUME , Toshiaki OKUNO , Izumi OZEKI , Tomohiro OMURE , Keisuke TAIHAKU , Takashi YAMAMOTO
CPC分类号： H01F1/0536 , B22F3/1021 , B22F3/22 , B22F5/006 , B22F2998/10 , B22F2999/00 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C2202/02 , H01F1/0577 , H01F7/02 , H01F41/0253 , H01F41/0273 , B22F2009/043 , B22F2009/044 , B22F2202/05 , B22F2201/01 , B22F2201/10 , B22F9/04 , B22F2201/02 , B22F2201/11 , B22F2201/12 , B22F9/023 , B22F1/0074 , B22F3/105
摘要： Provided are a rare earth permanent magnet whose permanent magnetic properties are improved by making density of the magnet very high and a method for manufacturing a rare earth permanent magnet. Thus, magnet raw material is milled into magnet powder, and then a compound is formed by mixing the magnet powder thus milled with a binder. Next, the compound thus formed is subjected to hot-melt molding onto a supporting substrate so as to form a green sheet molded to a sheet-like shape. Thereafter, while the green sheet thus molded is softened by heating, magnetic field orientation is carried out by applying a magnetic field to the green sheet thus heated; and further, the green sheet having been subjected to the magnetic field orientation is calcined in non-oxidizing atmosphere, and then, sintering thereof is carried out at a sintering temperature to produce a permanent magnet having density of 95% or more.
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公开(公告)号：US20200282463A1
公开(公告)日：2020-09-10
申请号：US16616653
申请日：2018-05-25
摘要： A method for manufacturing a magnet includes (1) a step of preparing three or more unmagnetized magnet materials of which magnetization easy axes are oriented in predetermined directions, and adhering the unmagnetized magnet materials with each other to make an assembly, and (2) a step of applying a curved pulse magnetic field to the assembly to magnetize the assembly, wherein in the step (2), the unmagnetized magnet materials are magnetized into magnet blocks, and an angle θ (where 0≤θ≤180 degrees holds) formed by magnetization directions of at least a pair of magnet blocks adjacent to each other is in a range of 30 degrees to 120 degrees.
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公开(公告)号：US20190228888A1
公开(公告)日：2019-07-25
申请号：US16336063
申请日：2017-09-25
发明人： Kenichi FUJIKAWA , Izumi OZEKI , Takashi YAMAMOTO , Hirofumi EBE , Takuya NOBUTA
摘要： A method comprises: charging a rare-earth magnet-forming material comprising magnet material particles into a mold, in a state in which an easy magnetization axis of each of the magnet material particles is oriented in one plane; sintering the rare-earth magnet-forming material charged in the mold by heating the rare-earth magnet-forming material to a sintering temperature while applying a given magnitude of pressing force to the rare-earth magnet-forming material, to thereby form a sintered body in which the magnet material particles are integrally sintered; and then subjecting the sintered body to high-temperature heat treatment, under a pressure lower than the pressing force during the sintering and under a maximum achieving temperature which ranges from greater than 900° C. to 1100° C., and whose difference from a maximum achieving temperature during the pressure sintering is within 250° C.
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公开(公告)号：US20180115205A1
公开(公告)日：2018-04-26
申请号：US15560813
申请日：2016-03-24
CPC分类号： H02K1/2766 , B22F3/105 , C22C38/005 , H01F1/0536 , H01F1/0577 , H01F1/086 , H01F7/02 , H01F41/0273 , H02K1/22 , H02K1/27 , H02K15/03
摘要： This invention provides for a rare-earth permanent magnet-forming sintered body obtained by integrally sintering magnet material particles containing a rare-earth substance while shaping the magnet material particles, a rare-earth permanent magnet obtained by magnetizing the sintered body, and a rotary machine in which the permanent magnet is embedded.
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公开(公告)号：US20170187258A1
公开(公告)日：2017-06-29
申请号：US15315451
申请日：2015-05-25
发明人： Kenichi FUJIKAWA , Katsuya KUME , Toshinobu HOSHINO , Miho YAMAGUCHI , Masakazu MORIMOTO , Makoto FUJIHARA , Toshiaki OKUNO , Eiichi IMOTO , Hirofumi EBE , Tomohiro OMURE , Izumi OZEKI , Yuki KATO , Takashi YAMAMOTO , Shoichiro SAITO
CPC分类号： H02K1/2786 , H01F7/02 , H01F7/021 , H01F41/0266 , H01F41/028 , H02K1/02 , H02K1/27 , H02K1/2733 , H02K1/278 , H02K15/03
摘要： Raw material magnet is milled to magnet powder, and the magnet powder thus milled is mixed with a binder to form a compound 12. Then, the compound 12 thus formed is molded to a green sheet 14 having a sheet shape. Thereafter, a magnetic field orientation is carried out by applying a magnetic field to the green sheet 14 thus molded, and then, the green sheet 14 having been subjected to the magnetic field orientation is shaped to a product shape by deforming thereof. Thereafter, the permanent magnet 1 is produced by sintering thereof. The permanent magnet 1 has a ring shape, and is constituted such that an axis of easy magnetization may be orientated at a slant so as to converge in a direction along a converging axis P which is set to a radius direction as well as to a center direction of the ring shape.
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公开(公告)号：US20170178773A1
公开(公告)日：2017-06-22
申请号：US15118116
申请日：2014-02-12
发明人： Izumi OZEKI , Katsuya KUME , Toshiaki OKUNO , Takashi OZAKI , Tomohiro OMURE , Keisuke TAIHAKU , Takashi YAMAMOTO
CPC分类号： H01F1/0536 , B22F3/1021 , B22F3/22 , B22F5/006 , B22F9/04 , B22F2009/041 , B22F2998/10 , B22F2999/00 , C22C1/0441 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C2202/02 , H01F1/0577 , H01F41/0273 , B22F2009/043 , B22F2009/044 , B22F2201/01 , B22F2201/02 , B22F2201/11 , B22F2201/12 , B22F2202/05 , B22F9/023 , B22F1/0074 , B22F3/105
摘要： Provided are a rare-earth permanent magnet whose magnet density after sintering is very high and a method for manufacturing a rare-earth permanent magnet. Thus, a magnet raw material is milled into magnet powder, and then, a compound 12 is formed by mixing the magnet powder thus milled with a binder. Next, the compound 12 thus formed is subjected to a hot-melt molding onto a supporting substrate 13 so as to form a green sheet 14 molded to a sheet-like shape. Thereafter, while the green sheet 14 thus molded is softened by heating, magnetic field orientation is carried out by applying a magnetic field to the green sheet 14 thus heated; and further, the green sheet 14 having been subjected to the magnetic field orientation is calcined by a vacuum sintering, which is further followed by a pressure sintering to produce a permanent magnet 1.
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