Patents by Inventor Narifumi Tojima
Narifumi Tojima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10637305Abstract: This double stator-type rotary machine is provided with: an annular rotor; an outer stator that is disposed on the outer side of the rotor; and an inner stator that is disposed on the inner side of the rotor. The rotor is provided with permanent magnets that are arranged on the inner stator side.Type: GrantFiled: April 14, 2017Date of Patent: April 28, 2020Assignee: IHI CORPORATIONInventors: Narifumi Tojima, Takehiro Jikumaru
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Patent number: 10511199Abstract: The rotary machine of the present disclosure is provided with an annular stator that has: an annular yoke section; multiple salient poles that protrude radially inward and are arranged circumferentially; and coils disposed on the salient poles. Circumferential surfaces of the salient poles are formed into tapered surfaces that taper toward the tip of the salient poles, and the coils include a first coil and a second coil.Type: GrantFiled: April 19, 2017Date of Patent: December 17, 2019Assignee: IHI CORPORATIONInventors: Narifumi Tojima, Takehiro Jikumaru
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Patent number: 10367398Abstract: A double-stator switched reluctance motor includes an annular rotor, an outer stator disposed outside the rotor, and an inner stator disposed inside the rotor. Phases of the salient poles in a rotational direction of the rotor are different from each other in at least one of a set of first stator salient poles and second stator salient poles and a set of first rotor salient poles and second rotor salient poles.Type: GrantFiled: September 29, 2016Date of Patent: July 30, 2019Assignee: IHI CORPORATIONInventors: Narifumi Tojima, Takehiro Jikumaru, Norihisa Handa, Koshi Ishimoto, Gen Kuwata, Satoru Ohashi, Toshiyuki Hirao
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Patent number: 10014738Abstract: A magnetic wave gear device (1A, 1B, 1F) includes: a first member (10), a second member (20), and a third member (30) which are rotatable relative to one another around a rotation axis (R). The second member (20) is disposed between the first member (10) and the third member (30), and includes magnetic material pieces (21). The first member (10) includes first permanent magnets (12A, 12B). The third member (30) includes: a plurality of pole teeth (32), a pole tooth (32) being wound with a coil (33); and second permanent magnets (34B), each second permanent magnet (34B) being disposed between pole teeth (32) next to each other, and the magnetic poles of sides of the second permnanent magnets (34B) facing the second member (20) being the same pole.Type: GrantFiled: May 21, 2013Date of Patent: July 3, 2018Assignees: IHI CORPORATION, OSAKA UNIVERSITYInventors: Narifumi Tojima, Koshi Ishimoto, Katsuhiro Hirata, Noboru Niguchi, Ariff Zaini, Tsubasa Oshiumi, Eiki Morimoto
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Publication number: 20170222507Abstract: The rotary machine of the present disclosure is provided with an annular stator that has: an annular yoke section; multiple salient poles that protrude radially inward and are arranged circumferentially; and coils disposed on the salient poles. Circumferential surfaces of the salient poles are formed into tapered surfaces that taper toward the tip of the salient poles, and the coils include a first coil and a second coil.Type: ApplicationFiled: April 19, 2017Publication date: August 3, 2017Applicant: IHI CorporationInventors: Narifumi TOJIMA, Takehiro JIKUMARU
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Publication number: 20170222499Abstract: This double stator-type rotary machine is provided with: an annular rotor; an outer stator that is disposed on the outer side of the rotor; and an inner stator that is disposed on the inner side of the rotor. The rotor is provided with permanent magnets that are arranged on the inner stator side.Type: ApplicationFiled: April 14, 2017Publication date: August 3, 2017Applicant: IHI CorporationInventors: Narifumi TOJIMA, Takehiro JIKUMARU
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Patent number: 9692267Abstract: A double stator switched reluctance rotating machine includes an annular rotor, an outer stator that is disposed outside the rotor, and an inner stator that is disposed inside the rotor; and employs a structure in which the rotor is provided with a bolt fastening hole passing through the rotor in an axial direction and the bolt fastening hole is provided at a position depending on magnetic characteristics of the outer and inner stators.Type: GrantFiled: June 18, 2015Date of Patent: June 27, 2017Assignee: IHI CORPORATIONInventors: Narifumi Tojima, Takehiro Jikumaru, Norihisa Handa, Koshi Ishimoto, Gen Kuwata, Satoru Ohashi, Toshiyuki Hirao
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Patent number: 9647520Abstract: A double stator switched reluctance rotating machine includes an annular rotor, an outer stator that is disposed outside the rotor, and an inner stator that is disposed inside the rotor, and has a structure in which the outer and inner stators are connected to each other in parallel.Type: GrantFiled: June 22, 2015Date of Patent: May 9, 2017Assignee: IHI CORPORATIONInventors: Narifumi Tojima, Takehiro Jikumaru, Norihisa Handa, Toshiyuki Hirao
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Publication number: 20170019005Abstract: A double-stator switched reluctance motor includes an annular rotor, an outer stator disposed outside the rotor, and an inner stator disposed inside the rotor. Phases of the salient poles in a rotational direction of the rotor are different from each other in at least one of a set of first stator salient poles and second stator salient poles and a set of first rotor salient poles and second rotor salient poles.Type: ApplicationFiled: September 29, 2016Publication date: January 19, 2017Applicant: IHI CorporationInventors: Narifumi TOJIMA, Takehiro JIKUMARU, Norihisa HANDA, Koshi ISHIMOTO, Gen KUWATA, Satoru OHASHI, Toshiyuki HIRAO
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Publication number: 20160006304Abstract: A magnetic wave gear device (1A, 1B, 1F) includes: a first member (10), a second member (20), and a third member (30) which are rotatable relative to one another around a rotation axis (R). The second member (20) is disposed between the first member (10) and the third member (30), and includes magnetic material pieces (21). The first member (10) includes first permanent magnets (12A, 12B). The third member (30) includes: a plurality of pole teeth (32), a pole tooth (32) being wound with a coil (33); and second permanent magnets (34B), each second permanent magnet (34B) being disposed between pole teeth (32) next to each other, and the magnetic poles of sides of the second permnanent magnets (34B) facing the second member (20) being the same pole.Type: ApplicationFiled: May 21, 2013Publication date: January 7, 2016Applicants: OSAKA UNIVERSITY, IHI CORPORATIONInventors: Narifumi TOJIMA, Koshi ISHIMOTO, Katsuhiro HIRATA, Noboru NIGUCHI, Ariff ZAINI, Tsubasa OSHIUMI, Eiki MORIMOTO
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Publication number: 20150288235Abstract: A double stator switched reluctance rotating machine includes an annular rotor, an outer stator that is disposed outside the rotor, and an inner stator that is disposed inside the rotor; and employs a structure in which the rotor is provided with a bolt fastening hole passing through the rotor in an axial direction and the bolt fastening hole is provided at a position depending on magnetic characteristics of the outer and inner stators.Type: ApplicationFiled: June 18, 2015Publication date: October 8, 2015Applicant: IHI CorporationInventors: Narifumi TOJIMA, Takehiro JIKUMARU, Norihisa HANDA, Koshi ISHIMOTO, Gen KUWATA, Satoru OHASHI, Toshiyuki HIRAO
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Publication number: 20150288264Abstract: A double stator switched reluctance rotating machine includes an annular rotor, an outer stator that is disposed outside the rotor, and an inner stator that is disposed inside the rotor, and has a structure in which the outer and inner stators are connected to each other in parallel.Type: ApplicationFiled: June 22, 2015Publication date: October 8, 2015Applicant: IHI CorporationInventors: Narifumi TOJIMA, Takehiro JIKUMARU, Norihisa HANDA, Toshiyuki HIRAO
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Patent number: 7567046Abstract: An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.Type: GrantFiled: October 19, 2005Date of Patent: July 28, 2009Assignee: IHI CorporationInventors: Narifumi Tojima, Takashi Majima, Mitsunao Sakamoto, Tetsuya Fukumoto
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Publication number: 20080089675Abstract: An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.Type: ApplicationFiled: October 19, 2005Publication date: April 17, 2008Inventors: Narifumi Tojima, Takashi Majima, Mitsunao Sakamoto, Tetsuya Fukumoto
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Patent number: 7352077Abstract: There are provided with a motor rotor (22) fixed to a turbine shaft (12) and rotating together with the turbine shaft, a motor stator (24) surrounding the motor rotor and fixed within a bearing housing (16), an inverted (26) converting a dc power into an ac power, and an inverter controller (28) controlling a frequency and a voltage of the ac power by the inverter. The inverter and the inverter controller are accommodated in a driver container (29), and are coupled to a compressor housing (20) by an insulating coupling member (30).Type: GrantFiled: August 8, 2006Date of Patent: April 1, 2008Assignee: Ishikawajima-Harima Heavy Industries Co., Ltd.Inventors: Yasuyuki Shibui, Yukio Takahashi, Narifumi Tojima
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Publication number: 20070108772Abstract: There are provided with a motor rotor (22) fixed to a turbine shaft (12) and rotating together with the turbine shaft, a motor stator (24) surrounding the motor rotor and fixed within a bearing housing (16), an inverted (26) converting a dc power into an ac power, and an inverter controller (28) controlling a frequency and a voltage of the ac power by the inverter. The inverter and the inverter controller are accommodated in a driver container (29), and are coupled to a compressor housing (20) by an insulating coupling member (30).Type: ApplicationFiled: August 8, 2006Publication date: May 17, 2007Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd.Inventors: Yasuyuki Shibui, Yukio Takahashi, Narifumi Tojima