Patents by Inventor Mitsutoshi AKITA
Mitsutoshi AKITA 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: 11735345Abstract: The method for manufacturing the Halbach magnet array includes the steps of: (a) magnetizing at least two first magnetic material pieces in a direction parallel to a first direction, and (b) magnetizing at least one second magnetic material piece in a direction parallel to a second direction perpendicular to the first direction, in this order. In the step (a), the first magnetic material pieces and the second magnetic material piece are alternately arranged in the second direction with the first magnetic material pieces being each adhered to the adjacent second magnetic material piece, and the magnetization is performed under a condition in which a residual magnetization ratio r1 of the first magnetic material pieces is higher than a residual magnetization ratio r2 of the second magnetic material piece.Type: GrantFiled: May 27, 2022Date of Patent: August 22, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Keiu Kanada, Reimi Sakaguchi, Masaaki Ito, Takuya Nomura, Daisuke Ichigozaki, Motoki Hiraoka, Mitsutoshi Akita
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Patent number: 11695306Abstract: A rotating electrical machine capable of obtaining a higher torque while minimizing the amount of permanent magnets used. A rotor core includes a plurality of first insertion holes each having an auxiliary magnet embedded therein, the auxiliary magnet being embedded so as to surround a rotation axis of a rotor in a cross-section orthogonal to the rotation axis. The rotor core includes a plurality of second insertion holes each having a main magnet embedded therein, the main magnet being embedded so as to extend from the auxiliary magnet toward an outer circumferential direction of the rotor. The rotor includes a plurality of magnetic poles formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets. The auxiliary magnet is arranged disproportionately on one side of the first insertion hole in the circumferential direction of the rotor so as to form a clearance on the other side of the first insertion hole.Type: GrantFiled: October 19, 2021Date of Patent: July 4, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tatsuhiko Hirano, Kyoko Nakamura, Mitsutoshi Akita, Daisuke Ichigozaki, Akira Yamashita
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Patent number: 11611250Abstract: A plurality of auxiliary magnets is embedded in a rotor core so as to surround the rotation axis of the rotating electrical machine in the cross-section orthogonal to the rotation axis. A plurality of main magnets is embedded in the rotor core so as to extend from the auxiliary magnet in the outer circumferential direction of the rotor. A plurality of magnetic poles of the rotor is formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets arranged at a distance from each other in the circumferential direction of the rotor, and the plurality of main magnets of each magnetic pole is arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole.Type: GrantFiled: March 4, 2021Date of Patent: March 21, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi Akita, Daisuke Ichigozaki, Tatsuhiko Hirano, Kyoko Nakamura, Akira Yamashita
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Publication number: 20220384083Abstract: The method for manufacturing the Halbach magnet array includes the steps of: (a) magnetizing at least two first magnetic material pieces in a direction parallel to a first direction, and (b) magnetizing at least one second magnetic material piece in a direction parallel to a second direction perpendicular to the first direction, in this order. In the step (a), the first magnetic material pieces and the second magnetic material piece are alternately arranged in the second direction with the first magnetic material pieces being each adhered to the adjacent second magnetic material piece, and the magnetization is performed under a condition in which a residual magnetization ratio r1 of the first magnetic material pieces is higher than a residual magnetization ratio r2 of the second magnetic material piece.Type: ApplicationFiled: May 27, 2022Publication date: December 1, 2022Inventors: Keiu Kanada, Reimi Sakaguchi, Masaaki Ito, Takuya Nomura, Daisuke Ichigozaki, Motoki Hiraoka, Mitsutoshi Akita
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Publication number: 20220131433Abstract: Provided is a rotating electrical machine capable of obtaining a higher torque while minimizing the amount of permanent magnets used. A rotor core includes a plurality of first insertion holes each having an auxiliary magnet embedded therein, the auxiliary magnet being embedded so as to surround a rotation axis of a rotor in a cross-section orthogonal to the rotation axis. The rotor core includes a plurality of second insertion holes each having a main magnet embedded therein, the main magnet being embedded so as to extend from the auxiliary magnet toward an outer circumferential direction of the rotor. The rotor includes a plurality of magnetic poles formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets. The auxiliary magnet is arranged disproportionately on one side of the first insertion hole in the circumferential direction of the rotor so as to form a clearance on the other side of the first insertion hole.Type: ApplicationFiled: October 19, 2021Publication date: April 28, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tatsuhiko Hirano, Kyoko Nakamura, Mitsutoshi Akita, Daisuke Ichigozaki, Akira Yamashita
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Publication number: 20210281132Abstract: A plurality of auxiliary magnets is embedded in a rotor core so as to surround the rotation axis of the rotating electrical machine in the cross-section orthogonal to the rotation axis. A plurality of main magnets is embedded in the rotor core so as to extend from the auxiliary magnet in the outer circumferential direction of the rotor. A plurality of magnetic poles of the rotor is formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets arranged at a distance from each other in the circumferential direction of the rotor, and the plurality of main magnets of each magnetic pole is arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole.Type: ApplicationFiled: March 4, 2021Publication date: September 9, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi AKITA, Daisuke ICHIGOZAKI, Tatsuhiko HIRANO, Kyoko NAKAMURA, Akira YAMASHITA