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公开(公告)号：US10600541B2
公开(公告)日：2020-03-24
申请号：US15785400
申请日：2017-10-16
Applicant: NTN CORPORATION
Inventor： Shinji Miyazaki , Takuji Harano , Tatsuo Nakajima
Abstract: There is provided a compression-bonded magnet with a case, which can realize high magnetic properties, high corrosion resistance and high durability strength even at low cost. The compression-bonded magnet with a case is a compression-bonded magnet with a case 1, comprising: a compression-bonded magnet 2 comprising a rare earth magnet powder such as an isotropic Nd—Fe—B magnet powder and a resin binder of a thermosetting resin; a case 3 for inserting the compression-bonded magnet 2; and a sealing member 4, wherein the compression-bonded magnet 2 is formed by compression-molding a mixture comprising the rare earth magnet powder and the resin binder into a green compact and curing the resin binder contained in the green compact, the rare earth magnet powder is contained in a large amount with respect to the entire compression-bonded magnet (for example, in a volume ratio of 85% to 90%), the sealing member 4 is fixed at an insertion opening part 3a of the case 3, and the compression-bonded magnet 2 is hermetically sealed by the sealing member 4 and the case 3.
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公开(公告)号：US20190267183A1
公开(公告)日：2019-08-29
申请号：US16404314
申请日：2019-05-06
Applicant: NTN CORPORATION
Inventor： Kayo SAKAI , Eiichirou Shimazu , Shougo Kanbe , Shinji Miyazaki
Abstract: Provided is a compact inductor in which electric insulation between a coil and a core is ensured. The inductor includes a core, a bobbin, and a coil. The core has a middle portion extending in a direction, and two collar portions spreading radially outward from both respective ends of the portion in the direction. The bobbin has a cylindrical portion extending in the direction and fitted to an outer periphery of the portion. The coil is wound on the portion via the portion. The bobbin further includes flange portions extending from both respective ends of the portion, each portion separating the corresponding portion from the coil, and a positioning portion located at a radially inner side with respect to a radially outer end of the portion. The positioning portion faces the corresponding portion, and projects toward and abuts the corresponding portion.
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公开(公告)号：US10395813B2
公开(公告)日：2019-08-27
申请号：US14433002
申请日：2013-09-27
Applicant: NTN CORPORATION
Inventor： Ikuo Uemoto , Shinji Miyazaki , Takuji Harano , Natsuhiko Mori , Hiroyuki Noda
Abstract: The present invention provides a magnetic core which can be produced with improved productivity without increasing a material cost and has required magnetic and mechanical properties and a process for producing the same. The magnetic core is produced by compression molding and thereafter thermally hardening iron-based soft magnetic powder having resin films formed on surfaces of particles thereof. The resin film is an uncured resin film formed by dry mixing the iron-based soft magnetic powder and epoxy resin containing a latent curing agent with each other at a temperature not less than a softening temperature of the epoxy resin and less than a thermal curing starting temperature thereof. The iron-based soft magnetic powder having the resin films formed on the surfaces of the particles thereof is compression molded by using a die to produce a compression molded body. The compression molded body having the resin films formed on the surfaces of the particles thereof is thermally hardened at a temperature not less than the thermal curing starting temperature of the epoxy resin.
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公开(公告)号：US10074471B2
公开(公告)日：2018-09-11
申请号：US15128893
申请日：2015-03-18
Applicant: NTN CORPORATION
Inventor： Kayo Sakai , Eiichirou Shimazu , Shinji Miyazaki , Takayuki Oda
CPC classification number: H01F27/255 , H01F1/14733 , H01F1/14791 , H01F3/10 , H01F17/043 , H01F27/2823 , H01F37/00 , H01F2003/106
Abstract: The present invention provides a magnetic element in which iron loss-caused heat generation is restrained and which can be produced with a high productivity. The magnetic element has a magnetic body which allows a magnetic flux generated by a coil (4) to pass therethrough. The magnetic body is a combined body formed by combining two halves, of the magnetic body composed of the compression molded and injection molded bodies, obtained by bisection made in an axial direction of the coil with each other. A compression molded magnetic body (2) is disposed at a portion generating iron loss-caused heat to a high extent or a portion inferior in heat dissipation performance. An injection molded magnetic body (3) is disposed at a portion other than the portion where the compression molded magnetic body is disposed. The compression molded and injection molded magnetic bodies are combined with each other.
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公开(公告)号：US09620270B2
公开(公告)日：2017-04-11
申请号：US14417095
申请日：2013-07-24
Applicant: NTN CORPORATION
Inventor： Ikuo Uemoto , Shinji Miyazaki , Takuji Harano
CPC classification number: H01F1/37 , H01F3/08 , H01F3/10 , H01F17/04 , H01F27/255 , H01F27/2823 , H01F41/005 , H01F41/0246 , H01F2003/106
Abstract: The present invention provides a composite magnetic core, containing magnetic powders poor in its moldability, which can be configured arbitrarily and has a magnetic characteristic excellent in direct current superimposition characteristics and a magnetic element composed of the composite magnetic core and a coil wound around the circumference thereof. A compressed magnetic body (2) obtained by compression-molding magnetic powders is combined with an injection-molded magnetic body (3) obtained by mixing a binding resin with magnetic powders having surfaces thereof electrically insulated and by injection-molding a mixture of the magnetic powders and the binding resin. The compressed magnetic body (2) is press-fitted into the injection-molded magnetic body (3) or bonded thereto at a combining portion thereof to obtain the combined body. The combined body is composed of the injection-molded magnetic body (3) constituting a housing in which the compressed magnetic body (2) is disposed.
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Patent Agency Ranking
公开(公告)号：US09818521B2
公开(公告)日：2017-11-14
申请号：US15104224
申请日：2014-12-10
Applicant: NTN CORPORATION
Inventor： Shinji Miyazaki , Takuji Harano , Tatsuo Nakajima
CPC classification number: H01F7/021 , B22F3/02 , B23K35/3613 , C22C33/02 , C22C38/00 , C22C2202/02 , G01D5/14 , G01D5/145 , H01F1/0576 , H01F1/0578 , H01F7/0221 , H01F41/026 , H01F41/0266
Abstract: There is provided a compression-bonded magnet with a case, which can realize high magnetic properties, high corrosion resistance and high durability strength even at low cost. The compression-bonded magnet with a case is a compression-bonded magnet with a case 1, comprising: a compression-bonded magnet 2 comprising a rare earth magnet powder such as an isotropic Nd—Fe—B magnet powder and a resin binder of a thermosetting resin; a case 3 for inserting the compression-bonded magnet 2; and a sealing member 4, wherein the compression-bonded magnet 2 is formed by compression-molding a mixture comprising the rare earth magnet powder and the resin binder into a green compact and curing the resin binder contained in the green compact, the rare earth magnet powder is contained in a large amount with respect to the entire compression-bonded magnet (for example, in a volume ratio of 85% to 90%), the sealing member 4 is fixed at an insertion opening part 3a of the case 3, and the compression-bonded magnet 2 is hermetically sealed by the sealing member 4 and the case 3.
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公开(公告)号：US10204725B2
公开(公告)日：2019-02-12
申请号：US15445649
申请日：2017-02-28
Applicant: NTN CORPORATION
Inventor： Ikuo Uemoto , Shinji Miyazaki , Takuji Harano
IPC: H01F27/24 , H01F1/37 , H01F27/255 , H01F3/10 , H01F17/04 , H01F3/08 , H01F41/00 , H01F41/02 , H01F27/28
Abstract: The present invention provides a composite magnetic core, containing magnetic powders poor in its moldability, which can be configured arbitrarily and has a magnetic characteristic excellent in direct current superimposition characteristics and a magnetic element composed of the composite magnetic core and a coil wound around the circumference thereof. A compressed magnetic body (2) obtained by compression-molding magnetic powders is combined with an injection-molded magnetic body (3) obtained by mixing a binding resin with magnetic powders having surfaces thereof electrically insulated and by injection-molding a mixture of the magnetic powders and the binding resin. The compressed magnetic body (2) is press-fitted into the injection-molded magnetic body (3) or bonded thereto at a combining portion thereof to obtain the combined body. The combined body is composed of the injection-molded magnetic body (3) constituting a housing in which the compressed magnetic body (2) is disposed.
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公开(公告)号：US20150179323A1
公开(公告)日：2015-06-25
申请号：US14417095
申请日：2013-07-24
Applicant: NTN CORPORATION
Inventor： Ikuo Uemoto , Shinji Miyazaki , Takuji Harano
IPC: H01F3/08
CPC classification number: H01F1/37 , H01F3/08 , H01F3/10 , H01F17/04 , H01F27/255 , H01F27/2823 , H01F41/005 , H01F41/0246 , H01F2003/106
Abstract: The present invention provides a composite magnetic core, containing magnetic powders poor in its moldability, which can be configured arbitrarily and has a magnetic characteristic excellent in direct current superimposition characteristics and a magnetic element composed of the composite magnetic core and a coil wound around the circumference thereof. A compressed magnetic body (2) obtained by compression-molding magnetic powders is combined with an injection-molded magnetic body (3) obtained by mixing a binding resin with magnetic powders having surfaces thereof electrically insulated and by injection-molding a mixture of the magnetic powders and the binding resin. The compressed magnetic body (2) is press-fitted into the injection-molded magnetic body (3) or bonded thereto at a combining portion thereof to obtain the combined body. The combined body is composed of the injection-molded magnetic body (3) constituting a housing in which the compressed magnetic body (2) is disposed.
Abstract translation: 本发明提供一种复合磁芯，其含有成型性差的磁性粉末，其可以任意配置，并且具有优异的直流叠加特性的磁特性和由复合磁芯和缠绕在圆周上的线圈组成的磁性元件 其中。 将通过压缩成型磁粉获得的压缩磁体（2）与通过将粘合树脂与其表面电绝缘的磁粉混合而获得的注射成型磁体（3）和通过注射成型磁性混合物 粉末和粘合树脂。 将压缩磁体（2）压配合到注射成型磁体（3）中或者在其组合部分与其结合，以获得组合体。 组合体由构成压缩磁体（2）的壳体的注射成型磁性体（3）构成。
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公开(公告)号：US20190006078A1
公开(公告)日：2019-01-03
申请号：US16127751
申请日：2018-09-11
Applicant: NTN CORPORATION
Inventor： Kayo SAKAI , Eiichirou Shimazu , Shougo Kanbe , Shinji Miyazaki
IPC: H01F17/04 , H01F27/255 , H01F27/28
Abstract: Provided is a hybrid magnetic device obtained by combining a central core having a higher relative permeability than a peripheral core but is able to inhibit magnetic saturation of the peripheral core having a low relative permeability. The magnetic device (1) includes: a peripheral core (5) disposed around the outer periphery of a coil (3); a central core (6) having a higher relative permeability than the peripheral core (5); and connection core portions (6, 6) at the outsides of ends in an axial direction of the coil (3), each connecting the central and peripheral cores (4, 5). Each or one of the portions (6, 6) includes a flange (4a) integrated with the central core (4) and extending from the central core (4) toward the peripheral core (6). The portions (6, 6) include a connection element (5a) other than the flange (4a), integrated with the peripheral core (5).
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公开(公告)号：US09976874B2
公开(公告)日：2018-05-22
申请号：US14904223
申请日：2014-07-02
Applicant: NTN CORPORATION
Inventor： Toru Takahashi , Tatsuo Nakajima , Hiroyuki Hakamata , Ikuo Uemoto , Shinji Miyazaki , Takuji Harano , Takayuki Oda
CPC classification number: G01D5/14 , G01D5/24438 , G01D5/2452 , G01D5/246
Abstract: A magnetic encoder device (3) of the present invention includes a base portion (33) having a mounting surface (33b) for mounting to a rotary shaft (2), a cored bar (35) fitted and fixed over the base portion (33), and a double-row magnetic encoder track (30) formed on the cored bar (35). Through movement of each of magnetic poles of the magnetic encoder track (30) over a region opposed to a magnetic sensor (4), an angle of the rotating rotary shaft is detected. The base portion (33) is formed of a sintered metal, and the mounting surface (33b) is subjected to sizing.
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