Patents by Inventor Mayumi TAKAZAWA
Mayumi TAKAZAWA 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: 11804741Abstract: A motor includes a rotor fixed to a rotary shaft, a stator arranged so as to surround the rotor with a gap from the rotor in a radial direction orthogonal to an axis direction of the rotary shaft, and a case accommodating the rotor and the stator. The rotor includes a plurality of rotor cores made from a soft magnetic material, and a rotor fixing member that fixes the rotor cores. The stator includes a plurality of stator cores made from a soft magnetic material, a stator fixing member that fixes the stator cores, and coils wound around the stator cores, respectively. The motor includes at least two sets of the rotor and the stator, and the sets are stacked in an axis direction of the rotary shaft.Type: GrantFiled: May 3, 2022Date of Patent: October 31, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayumi Takazawa, Kazuaki Haga, Toshimitsu Takahashi, Takuya Nomura, Shinya Sano, Yasuhide Yagyu, Takeshi Tomonaga, Hisanori Koma, Keiu Kanada
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Publication number: 20230318423Abstract: In an axial gap motor, a rotor includes a plurality of rotor cores fixed in a circumferential direction of a rotor base, and a stator includes a plurality of stator cores fixed in a circumferential direction of a stator base, and coils wound around the stator cores. End faces of each of the rotor cores and end faces of the corresponding stator core are opposed to each other while being exposed to each other.Type: ApplicationFiled: June 8, 2023Publication date: October 5, 2023Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Keiu Kanada, Kazuaki Haga, Toshimitsu Takahashi, Mayumi Takazawa, Takuya Nomura, Shinya Sano, Takeshi Tomonaga, Hisanori Koma, Yasuhide Yagyu, Kensuke Komori, Tatsuhiko Hirano, Masaaki Ito, Hiroaki Wakimoto
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Patent number: 11711004Abstract: In an axial gap motor, a rotor includes a plurality of rotor cores fixed in a circumferential direction of a rotor base, and a stator includes a plurality of stator cores fixed in a circumferential direction of a stator base, and coils wound around the stator cores. End faces of each of the rotor cores and end faces of the corresponding stator core are opposed to each other while being exposed to each other.Type: GrantFiled: April 12, 2021Date of Patent: July 25, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Keiu Kanada, Kazuaki Haga, Toshimitsu Takahashi, Mayumi Takazawa, Takuya Nomura, Shinya Sano, Takeshi Tomonaga, Hisanori Koma, Yasuhide Yagyu, Kensuke Komori, Tatsuhiko Hirano, Masaaki Ito, Hiroaki Wakimoto
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Publication number: 20220376567Abstract: A motor includes a rotor fixed to a rotary shaft, a stator arranged so as to surround the rotor with a gap from the rotor in a radial direction orthogonal to an axis direction of the rotary shaft, and a case accommodating the rotor and the stator. The rotor includes a plurality of rotor cores made from a soft magnetic material, and a rotor fixing member that fixes the rotor cores. The stator includes a plurality of stator cores made from a soft magnetic material, a stator fixing member that fixes the stator cores, and coils wound around the stator cores, respectively. The motor includes at least two sets of the rotor and the stator, and the sets are stacked in an axis direction of the rotary shaft.Type: ApplicationFiled: May 3, 2022Publication date: November 24, 2022Inventors: Mayumi TAKAZAWA, Kazuaki HAGA, Toshimitsu TAKAHASHI, Takuya NOMURA, Shinya SANO, Yasuhide YAGYU, Takeshi TOMONAGA, Hisanori KOMA, Keiu KANADA
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Publication number: 20220203440Abstract: Provided is a rare earth magnet that allows suppressing deterioration of magnetic properties and a method for manufacturing the same. The rare earth magnet of the present disclosure includes a magnet body containing a rare earth element R1, a transition metal element T, and boron B and includes a main phase. A region in the vicinity of a corner portion of the magnet body of a constituent surface constituting a surface of the magnet body is a processed surface on which a removal process has been performed, and a region closer to a center than the region in the vicinity of the corner portion of the constituent surface is a non-processed surface on which the removal process is not performed.Type: ApplicationFiled: December 8, 2021Publication date: June 30, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayumi TAKAZAWA, Kazuaki HAGA, Daisuke ICHIGOZAKI, Masaaki ITO, Hisanori KOMA, Shinya SANO, Kensuke KOMORI, Keiu KANADA
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Publication number: 20210328490Abstract: In an axial gap motor, a rotor includes a plurality of rotor cores fixed in a circumferential direction of a rotor base, and a stator includes a plurality of stator cores fixed in a circumferential direction of a stator base, and coils wound around the stator cores. End faces of each of the rotor cores and end faces of the corresponding stator core are opposed to each other while being exposed to each other.Type: ApplicationFiled: April 12, 2021Publication date: October 21, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Keiu KANADA, Kazuaki HAGA, Toshimitsu TAKAHASHI, Mayumi TAKAZAWA, Takuya NOMURA, Shinya SANO, Takeshi TOMONAGA, Hisanori KOMA, Yasuhide YAGYU, Kensuke KOMORI, Tatsuhiko HIRANO, Masaaki ITO, Hiroaki WAKIMOTO
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Publication number: 20210083534Abstract: A magnet embedded type motor capable of reducing a counter electromotive voltage while improving a torque is provided. The magnet embedded type motor of the present disclosure includes a stator and a rotor rotatably disposed inside the stator. The stator includes a stator core and a coil wound around the stator core. The rotor includes a rotor core and a plurality of magnet groups embedded in the rotor core along a circumferential direction. The plurality of magnet groups form a plurality of respective magnetic poles. A magnetic material constituting the rotor core has a saturation magnetic flux density higher than a saturation magnetic flux density of a magnetic material constituting the stator core by 0.2 T or more.Type: ApplicationFiled: August 21, 2020Publication date: March 18, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayumi TAKAZAWA, Fumitaka Yoshinaga
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Publication number: 20200127544Abstract: A manufacturing method for a rotor core included in a rotor of a motor punches an electromagnetic steel sheet includes punching a plurality of plates for rotor core from an electromagnetic steel sheet; producing a rotor-core precursor by stacking up the plates for rotor core; manufacturing a rotor core by annealing an outer circumferential region of the rotor-core precursor at a first predetermined temperature, and annealing an inner circumferential region of the rotor-core precursor at a second predetermined temperature; the first predetermined temperature being a temperature at which grain growth of crystals of the electromagnetic steel sheet is promoted; and the second predetermined temperature being a temperature at which grain growth of the crystals of the electromagnetic steel sheet is not promoted.Type: ApplicationFiled: December 23, 2019Publication date: April 23, 2020Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshimitsu TAKAHASHI, Shigeto TAKEUCHI, Mayumi TAKAZAWA
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Patent number: 10554107Abstract: A manufacturing method for a rotor core included in a rotor of a motor punches an electromagnetic steel sheet includes punching a plurality of plates for rotor core from an electromagnetic steel sheet; producing a rotor-core precursor by stacking up the plates for rotor core; manufacturing a rotor core by annealing an outer circumferential region of the rotor-core precursor at a first predetermined temperature, and annealing an inner circumferential region of the rotor-core precursor at a second predetermined temperature; the first predetermined temperature being a temperature at which grain growth of crystals of the electromagnetic steel sheet is promoted; and the second predetermined temperature being a temperature at which grain growth of the crystals of the electromagnetic steel sheet is not promoted.Type: GrantFiled: November 8, 2017Date of Patent: February 4, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshimitsu Takahashi, Shigeto Takeuchi, Mayumi Takazawa
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Publication number: 20180152087Abstract: A manufacturing method for a rotor core included in a rotor of a motor punches an electromagnetic steel sheet includes punching a plurality of plates for rotor core from an electromagnetic steel sheet; producing a rotor-core precursor by stacking up the plates for rotor core; manufacturing a rotor core by annealing an outer circumferential region of the rotor-core precursor at a first predetermined temperature, and annealing an inner circumferential region of the rotor-core precursor at a second predetermined temperature; the first predetermined temperature being a temperature at which grain growth of crystals of the electromagnetic steel sheet is promoted; and the second predetermined temperature being a temperature at which grain growth of the crystals of the electromagnetic steel sheet is not promoted.Type: ApplicationFiled: November 8, 2017Publication date: May 31, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshimitsu TAKAHASHI, Shigeto TAKEUCHI, Mayumi TAKAZAWA