Patents by Inventor Hiroko Ikeda
Hiroko Ikeda 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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Publication number: 20220363310Abstract: The redundant resolver includes: a resolver body having a rotor, a stator opposed to the rotor and having Ns teeth arranged in a circumferential direction, and an excitation winding and two phases of output windings wound on the stator; an excitation circuit configured to supply power to the excitation winding; and an angle calculation unit configured to calculate a rotation angle on the basis of signals from the two phases of output windings. The stator is divided in the circumferential direction into M pieces which serve as M tooth blocks, N (M?N) redundancy systems are formed on the basis of the M tooth blocks. The excitation circuit and the angle calculation unit are provided to each system so as be independent among the systems. Gap magnetic flux densities at both end portions of each tooth block are set to change mildly.Type: ApplicationFiled: November 18, 2019Publication date: November 17, 2022Applicant: Mitsubishi Electric CorporationInventors: Hiroko IKEDA, Tatsuya MORI, Toshihiro MATSUNAGA, Kenji IKEDA, Kenta KUBO
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Patent number: 11411445Abstract: A permanent-magnet synchronous motor and an electric power steering device are driven by a first system including a first armature winding and a first control apparatus and by a second system including a second armature winding and a second control apparatus and are configured in such a way that if one system fails, driving by the one system is stopped but the driving is continued by the other system.Type: GrantFiled: September 7, 2017Date of Patent: August 9, 2022Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Hiroko Ikeda, Kazumasa Ito, Shinichi Yamaguchi, Yu Hirotani, Satoru Akutsu
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Publication number: 20220224172Abstract: In a redundancy resolver device, winding groups of different systems are arranged at different positions in a circumferential direction of a stator core. The winding groups of each system include: an excitation winding group consisting of a plurality of excitation windings, and being connected to corresponding one of excitation circuits; a first output winding group; and a second output winding group. Each of the teeth has corresponding one of the excitation windings wound therearound. When two of the excitation windings belonging to different systems and being arranged side by side is the circumferential direction of the stator core are defined as a first end excitation winding and a second end excitation winding, respectively, the first end excitation winding and the second end excitation winding are applied with excitation signals to generate magnetic fluxes in the same direction of radial directions of the stator core.Type: ApplicationFiled: May 24, 2019Publication date: July 14, 2022Applicant: Mitsubishi Electric CorporationInventors: Hiroko IKEDA, Tatsuya MORI, Kenta MOTOYOSHI, Kodai OKAZAKI, Kenji IKEDA, Yosuke SUGINO, Seiji SAWADA, Kenta KUBO, Toshihiro MATSUNAGA
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Publication number: 20220149681Abstract: Provided is a rotating electric machine, including: a stator; and a rotor, wherein the rotor includes: a rotor core having a plurality of holes formed so as to be arranged in a circumferential direction of the rotor; and at least one permanent magnet, wherein the number of magnetic poles of the rotor is “p”, wherein the plurality of holes include a first hole into which the permanent magnet is inserted, and a second hole into which the permanent magnet is not inserted, the first hole including p/2 first holes, the second hole including p/2 second holes, wherein the first hole and the second hole are formed so as to be alternately arranged in the circumferential direction, and wherein the second hole includes a first opening portion that opens to the stator side in a radial direction of the rotor.Type: ApplicationFiled: March 28, 2019Publication date: May 12, 2022Applicant: Mitsubishi Electric CorporationInventors: Kenta MOTOYOSHI, Hidenori SASAKI, Kodai OKAZAKI, Hiroko IKEDA
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Patent number: 11264880Abstract: A permanent magnet motor includes a rotor having a field pole of a rotor core, wherein the field pole has a radius smaller than an arc centered on a shaft of the rotor, a multiple of slits are formed in the field pole, the multiple of slits are disposed so that an interval between a first central line positioned between a multiple of the slits and a second central line positioned between a neighboring multiple of the slits increases as the first central line and the second central line head toward an outer peripheral side of the rotor core, and of the multiple of slits of the field pole, a first slit disposed in a central position of the field pole, and a second slit and a third slit disposed on either side of the first slit, are disposed within 20% of a circumferential direction width of the permanent magnet.Type: GrantFiled: February 28, 2018Date of Patent: March 1, 2022Assignee: Mitsubishi Electric CorporationInventors: Yuji Takizawa, Hiroko Ikeda, Shinichi Yamaguchi, Yu Hirotani, Masafumi Okazaki, Satoru Akutsu
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Publication number: 20220037942Abstract: A rotor core of a rotating electrical machine has interpole bridges each disposed on an outer circumferential side with respect to a permanent magnet in a non-magnetic portion between the poles, and interpole diameter bridges each surrounded by two permanent magnets and an interpole bridge. The outer circumferential surface of each interpole bridge is formed by a first flat surface. Thus, a path of a magnetic flux passing through a magnetic gap is lengthened, so that a q-axis inductance is reduced. In addition, a width in a radial direction of each interpole bridge and a width in a circumferential direction of each interpole diameter bridge are constant, and each interpole bridge and each interpole diameter bridge are disposed so as to be perpendicular to each other to form a T shape. Thus, the concentration of stress during press-fitting of the permanent magnet into a magnet hole can be reduced.Type: ApplicationFiled: November 27, 2018Publication date: February 3, 2022Applicant: Mitsubishi Electric CorporationInventors: Kodai OKAZAKI, Kenta MOTOYOSHI, Yuji TAKIZAWA, Hiroko IKEDA, Hidenori SASAKI, Yu HIROTANI, Satoru AKUTSU, Masafumi OKAZAKI, Natsumi SUGI
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Publication number: 20220018646Abstract: Even using the redundant system resolver in which the magnetic interference between systems occurs, to provide an angle detection apparatus which can reduces the influence of the magnetic interference and can calculate the rotational angle with good accuracy, without performing synchronous control between systems in real time. An angle detection apparatus is provided with a resolver which has the first system windings and the second system windings in which magnetic interference occurs between systems; a first system removal processing unit that performs a second cycle component removal processing which removes component of the second cycle of the second system, to detection values of the first system winding output signals; and a first system angle calculation unit that calculates a first angle of rotor, based on the detection values of the first system winding output signals after the second cycle component removal processing.Type: ApplicationFiled: January 25, 2019Publication date: January 20, 2022Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Toshihiro MATSUNAGA, Hiroko IKEDA, Seiji SAWADA, Kenta KUBO, Kenji IKEDA
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Publication number: 20210135513Abstract: A permanent-magnet synchronous motor and an electric power steering device are driven by a first system including a first armature winding and a first control apparatus and by a second system including a second armature winding and a second control apparatus and are configured in such a way that if one system fails, driving by the one system is stopped but the driving is continued by the other system.Type: ApplicationFiled: September 7, 2017Publication date: May 6, 2021Applicant: Mitsubishi Electric CorporationInventors: Yuji TAKIZAWA, Hiroko IKEDA, Kazumasa ITO, Shinich YAMAGUCHI, Yu HIROTANI, Satoru AKUTSU
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Publication number: 20210075305Abstract: A permanent magnet motor includes a rotor having a field pole of a rotor core, wherein the field pole has a radius smaller than an arc centered on a shaft of the rotor, a multiple of slits are formed in the field pole, the multiple of slits are disposed so that an interval between a first central line positioned between a multiple of the slits and a second central line positioned between a neighboring multiple of the slits increases as the first central line and the second central line head toward an outer peripheral side of the rotor core, and of the multiple of slits of the field pole, a first slit disposed in a central position of the field pole, and a second slit and a third slit disposed on either side of the first slit, are disposed within 20% of a circumferential direction width of the permanent magnet.Type: ApplicationFiled: February 28, 2018Publication date: March 11, 2021Applicant: Mitsubishi Electric CorporationInventors: Yuji TAKIZAWA, Hiroko IKEDA, Shinichi YAMAGUCHI, Yu HIROTANI, Masafumi OKAZAKI, Satoru AKUTSU
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Publication number: 20210075273Abstract: A stator includes a core back portion, a plurality of teeth extending inward in a radial direction of the stator from the core back portion, a first system coil portion and a second system coil portion wound on each of the teeth, and a magnetic interference reduction member provided between the first system coil portion and the second system coil portion to reduce magnetic interference between the first system coil portion and the second system coil portion. Further, the first system coil portion and the second system coil portion are connected to mutually different power supply sources, that is, the first system coil portion and the second system coil portion are each connected to a first system power supply source or a second system power supply source.Type: ApplicationFiled: March 20, 2019Publication date: March 11, 2021Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroko IKEDA, Shinichi YAMAGUCHI, Yuji TAKIZAWA, Yu HIROTANI, Kazumasa ITO
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Patent number: 10903724Abstract: The present invention provides a rotation angle detector capable of detecting a rotation angle of a rotor in the same manner as at normal time even when abnormality such as disconnection or a short circuit occurs, and capable of reducing the number of terminals. When one spatial order cycle of the output winding is an electrical angle of 360°, a phase difference between a first output winding and a second output winding and a phase difference between the second output winding and a third output winding are set at an electrical angle ?, and ??180°×n (n is an integer).Type: GrantFiled: December 28, 2015Date of Patent: January 26, 2021Assignee: Mitsubishi Electric CorporationInventors: Hiroko Ikeda, Yusuke Morita, Kazumasa Ito, Yu Hirotani, Kodai Okazaki, Satoru Akutsu, Yuji Takizawa
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Patent number: 10855121Abstract: Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.Type: GrantFiled: December 26, 2016Date of Patent: December 1, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yu Hirotani, Kazumasa Ito, Hiroko Ikeda, Kodai Okazaki, Shinichi Yamaguchi
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Publication number: 20200363233Abstract: A redundant resolver is configured of a stator and a rotor that form a pair, wherein the rotor is a rotor with a shaft angle multiplier of Nx having Nx (Nx is a natural number) salient poles, the stator is such that n teeth T1 to Tn, where n is a natural number, are disposed sequentially in a circumferential direction, configuring M systems by being divided into M in the circumferential direction, and having an angle of 360/M degrees when angles of the teeth configuring one system are totaled, a one-phase excitation winding and a two-phase output winding are wound around each of the teeth T1 to Tn, excitation signals of the same frequency are applied by differing excitation circuits to the respective excitation windings, an output order per system is Nout (Nout is a natural number), and an abnormality is detected based on output signals of the M systems.Type: ApplicationFiled: December 21, 2017Publication date: November 19, 2020Applicant: Mitsubishi Electric CorporationInventors: Hiroko IKEDA, Yuji TAKIZAWA, Kazumasa ITO, Shinichi YAMAGUCHI, Toshihiro MATSUNAGA, Yosuke SUGINO
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Patent number: 10833549Abstract: In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of ?k that satisfies ?1<?k?m are different than the numbers of turns of conducting wire in the ?1 and ?m coil portions, and are also different than the numbers of turns of conducting wire in the coil portions that are adjacent to the ?k coil portions on two sides in a circumferential direction of the stator core, and phases of the ?k coil portions are also different than phases of each of the coil portions that are adjacent to the ?k coil portions on the two sides in the circumferential direction.Type: GrantFiled: February 26, 2016Date of Patent: November 10, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kodai Okazaki, Masatsugu Nakano, Kazumasa Ito, Yu Hirotani, Hiroko Ikeda, Koji Kawamura
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Patent number: 10404124Abstract: A rotary electric machine includes: a rotor; and a stator including: a stator core; and an armature winding that is mounted to the stator core. The armature winding includes by a plurality of identical-phase winding portions in which identical-phase coil portions among coil portions in which conducting wires are wound in concentration onto respective teeth are connected together into a series circuit by crossover wires, and that also have lead wires at two end portions. Each of the lead wires of each of the identical-phase winding portions is led out in a first axial direction of the rotor from coil portions that have identical phase, that are disposed to be adjacent in a circumferential direction of the stator core; and all of the crossover wires of each of the identical-phase winding portions are led out in a second axial direction of the rotor.Type: GrantFiled: September 16, 2016Date of Patent: September 3, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroko Ikeda, Yu Hirotani, Masatsugu Nakano, Kazumasa Ito, Kodai Okazaki, Koji Kawamura
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Publication number: 20190097474Abstract: Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.Type: ApplicationFiled: December 26, 2016Publication date: March 28, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yu HIROTANI, Kazumasa ITO, Hiroko IKEDA, Kodai OKAZAKI, Shinichi YAMAGUCHI
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Publication number: 20180351437Abstract: The present invention provides a rotation angle detector capable of detecting a rotation angle of a rotor in the same manner as at normal time even when abnormality such as disconnection or a short circuit occurs, and capable of reducing the number of terminals. When one spatial order cycle of the output winding is an electrical angle of 360°, a phase difference between a first output winding and a second output winding and a phase difference between the second output winding and a third output winding are set at an electrical angle ?, and ??180°×n (n is an integer).Type: ApplicationFiled: December 28, 2015Publication date: December 6, 2018Applicant: Mitsubishi Electric CorporationInventors: Hiroko IKEDA, Yusuke MORITA, Kazumasa ITO, Yu HIROTANI, Kodai OKAZAKI, Satoru AKUTSU, Yuji TAKIZAWA
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Publication number: 20180248433Abstract: In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of ?k that satisfies ?1<?k?m are different than the numbers of turns of conducting wire in the ?1 and ?m coil portions, and are also different than the numbers of turns of conducting wire in the coil portions that are adjacent to the ?k coil portions on two sides in a circumferential direction of the stator core, and phases of the ?k coil portions are also different than phases of each of the coil portions that are adjacent to the ?k coil portions on the two sides in the circumferential direction.Type: ApplicationFiled: February 26, 2016Publication date: August 30, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Kodai OKAZAKI, Masatsugu NAKANO, Kazumasa ITO, Yu HIROTANI, Hiroko IKEDA, Koji KAWAMURA
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Publication number: 20180248432Abstract: A rotary electric machine includes: a rotor; and a stator including: a stator core; and an armature winding that is mounted to the stator core. The armature winding includes by a plurality of identical-phase winding portions in which identical-phase coil portions among coil portions in which conducting wires are wound in concentration onto respective teeth are connected together into a series circuit by crossover wires, and that also have lead wires at two end portions. Each of the lead wires of each of the identical-phase winding portions is led out in a first axial direction of the rotor from coil portions that have identical phase, that are disposed to be adjacent in a circumferential direction of the stator core; and all of the crossover wires of each of the identical-phase winding portions are led out in a second axial direction of the rotor.Type: ApplicationFiled: September 16, 2016Publication date: August 30, 2018Applicant: Mitsubishi Electric CorporationInventors: Hiroko IKEDA, Yu HIROTANI, Masatsugu NAKANO, Kazumasa ITO, Kodai OKAZAKI, Koji KAWAMURA
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Publication number: 20110247648Abstract: It is an object of the invention to provide an effective technique for realizing a desired moisture releasing property, in a cosmetic puff having an air-laid non-woven fabric sheet formed of pulp fibers. A cosmetic puff 100 according to this invention includes an inner layer 110 in the form of a sheet and surface layers 120 in the form of laminated sheets on the both sides of the inner layer 110. The inner layer 110 is formed by an air-laid non-woven fabric sheet containing at least pulp fibers and polyethylene terephthalate fibers.Type: ApplicationFiled: October 14, 2009Publication date: October 13, 2011Applicant: UNI-CHARM CORPORATIONInventors: Hiroko Ikeda, Akira Shibata, Kenji Ooba, Takashi Aoto, Naohito Takeuchi