Patents by Inventor Kanako Nemoto
Kanako Nemoto 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: 9917487Abstract: A rotating electric machine allowing a rotor and a stator thereof to assume any of various numbers of poles and any of various numbers of slots and enabling a reduction in vibration and noise is provided. The rotating electric machine according to the present invention includes a stator having a plurality of teeth and a plurality of slots, which is configured so that the shape of the front ends of the teeth and the opening width of the slots are made to change cyclically F times along the circumferential direction (F is a natural number equal to or greater than 2).Type: GrantFiled: January 22, 2014Date of Patent: March 13, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kanako Nemoto, Hidetoshi Koka, Yutaka Matsunobu, Yasuyuki Saito
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Patent number: 9692261Abstract: Provided is a rotating electric machine including a rotor and stator fitted with various numbers of poles and slots and adapted to reduce vibration/noise of the machine. The rotating electric machine in accordance with an aspect of the present invention includes a stator having an S number of teeth, and a rotor disposed in the stator with a gap intervening between the stator and the rotor. The plurality of teeth in the stator are grouped in units of the number of teeth that is equal to a value “m” or a value “d”, the value “m” being obtained by dividing the number of stator slots, S, by the greatest common divisor N of the number of poles, P, and the number of stator slots, S, the value “d” being an aliquot of “m”. At least one tooth in each of the tooth groups has a distal end different in shape from distal ends of other teeth belonging to the same tooth group, and the plurality of tooth groups have the same configuration.Type: GrantFiled: June 19, 2013Date of Patent: June 27, 2017Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kanako Nemoto, Hidetoshi Koka
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Publication number: 20160056684Abstract: A rotating electric machine allowing a rotor and a stator thereof to assume any of various numbers of poles and any of various numbers of slots and enabling a reduction in vibration and noise is provided. The rotating electric machine according to the present invention includes a stator having a plurality of teeth and a plurality of slots, which is configured so that the shape of the front ends of the teeth and the opening width of the slots are made to change cyclically F times along the circumferential direction (F is a natural number equal to or greater than 2).Type: ApplicationFiled: January 22, 2014Publication date: February 25, 2016Inventors: Kanako NEMOTO, Hidetoshi KOKA, Yutaka MATSUNOBU, Yasuyuki SAITO
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Publication number: 20150295455Abstract: Provided is a rotating electric machine including a rotor and stator fitted with various numbers of poles and slots and adapted to reduce vibration/noise of the machine. The rotating electric machine in accordance with an aspect of the present invention includes a stator having an S number of teeth, and a rotor disposed in the stator with a gap intervening between the stator and the rotor. The plurality of teeth in the stator are grouped in units of the number of teeth that is equal to a value “m” or a value “d”, the value “m” being obtained by dividing the number of stator slots, S, by the greatest common divisor N of the number of poles, P, and the number of stator slots, S, the value “d” being an aliquot of “m”. At least one tooth in each of the tooth groups has a distal end different in shape from distal ends of other teeth belonging to the same tooth group, and the plurality of tooth groups have the same configuration.Type: ApplicationFiled: June 19, 2013Publication date: October 15, 2015Applicant: Hitachi Automotive Systems, Ltd.Inventors: Kanako Nemoto, Hidetoshi Koka
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Publication number: 20140167556Abstract: Disclosed is an electric rotating machine that includes a stator and a rotor. The stator includes a housing and a cylindrical stator core secured to the housing by shrinkage fitting. The rotor is rotatably disposed inside the stator. The stator core is formed of two or more circumferentially split cores. Spilt surfaces of the split cores are shaped in such a manner that the amount of distortion caused on the split surfaces on the outside diameter side by the shrinkage fitting is greater than the amount of distortion caused on the split surfaces on the inside diameter side by the shrinkage fitting.Type: ApplicationFiled: July 31, 2012Publication date: June 19, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Itsuro Sawada, Kanako Nemoto, Hideaki Mori, Satoshi Yamamura, Satoshi Kikuchi
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Publication number: 20130257207Abstract: An in-vehicle rotating electrical machine 100 includes a stator 1 having a stator core 4 wound by a stator coil 6, a rotor 2 disposed with a rotation gap on an inner peripheral side of the stator core 4, and a flange 5a being a mounting member for mounting the stator 1 on a vehicle 300. The flange 5a is formed such that an axial position of a mounting position with the vehicle 300 is matched with an axial position of a magnetic center of the stator 1.Type: ApplicationFiled: December 6, 2011Publication date: October 3, 2013Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTDInventors: Kanako Nemoto, Hideaki Mori, Kenichiro Matsubara, Yutaka Matsunobu
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Patent number: 7541710Abstract: Provided is a rotating electric machine which can restrain vibration and noise induced by a radial electromagnetic force of the rotating electric machine, and in which a rotor is divided into first to fourth four rotating pieces having axial lengths of 0.29L, 0.71L, 0.71L and 0.29L where 2L is an axial length of a rotor or stator core, and secondary conductors defining effective magnetic pole opening angles, are arranged being shifted by a value which is equal to a phase difference of electric angle between axial sections of the rotor pieces in order to define skews so that phase differences of electric angles are continuous between axial sections of the first and second rotor pieces, the skews being continuous between the third and fourth rotor pieces but being not continuous between the second and third rotor pieces arranged being shifted by a value which is equal to a phase difference of electric angle between axial sections of the rotor.Type: GrantFiled: November 30, 2005Date of Patent: June 2, 2009Assignee: Hitachi, Ltd.Inventors: Kanako Nemoto, Yasushi Takano, Kazuhiko Takahashi, Kazuo Shima, Kazuo Nishihama
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Patent number: 7518277Abstract: The vibration and noise excited by the electromagnetic exciting force in the radial direction of an electric motor are suppressed. In an electric motor 100, a rotor 1 is divided into four rotor pieces 3, 4, 5, and 6 for an axial length of 2L of one group of the rotor core, and for example, the four rotor pieces 3, 4, 5, and 6 are ideally 0.29L, 0.71L, 0.71L, and 0.29L in axial length in the axial direction, and permanent magnets 2 of the rotor pieces 3, 4, 5, and 6 are arranged in the circumferential direction so that the phase differences of the electrical angle are 0, ?, 0, and ?. Further, when an effect is obtained even if the ideal axial length is changed, the tolerance of the aforementioned axial length is ±0.1L.Type: GrantFiled: May 26, 2004Date of Patent: April 14, 2009Assignees: Hitachi, Ltd., Nissan Motor Co., Ltd.Inventors: Kanako Nemoto, Yasushi Takano, Michiyuki Takagi, Fumio Tajima, Akira Nezu, Tsukasa Yamazaki, Shunji Ooki, Masahide Kimura, Yasushi Fujita
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Publication number: 20070205689Abstract: The vibration and noise excited by the electromagnetic exciting force in the radial direction of an electric motor are suppressed. In an electric motor 100, a rotor 1 is divided into four rotor pieces 3, 4, 5, and 6 for an axial length of 2L of one group of the rotor core, and for example, the four rotor pieces 3, 4, 5, and 6 are ideally 0.29L, 0.71L, 0.71L, and 0.29L in axial length in the axial direction, and permanent magnets 2 of the rotor pieces 3, 4, 5, and 6 are arranged in the circumferential direction so that the phase differences of the electrical angle are 0, ?, 0, and ?. Further, when an effect is obtained even if the ideal axial length is changed, the tolerance of the aforementioned axial length is ±0.1L.Type: ApplicationFiled: May 26, 2004Publication date: September 6, 2007Applicants: Hitachi, Ltd., Nissan Motor Co., Ltd.Inventors: Kanako Nemoto, Yasushi Takano, Michiyuki Takagi, Fumio Tajima, Akira Nezu, Tsukasa Yamazaki, Shunji Ooki, Masahide Kimura, Yasushi Fujita
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Publication number: 20060163969Abstract: Provided is a rotating electric machine which can restrain vibration and noise induced by a radial electromagnetic force of the rotating electric machine, and in which a rotor is divided into first to fourth four rotating pieces having axial lengths of 0.29 L, 0.71 L, 0.71 L and 0.29 L where 2 L is an axial length of a rotor or stator core, and secondary conductors defining effective magnetic pole opening angles, are arranged being shifted by a value which is equal to a phase difference of electric angle between axial sections of the rotator pieces in order to define skews so that phase differences of electric angles are continuous between axial sections of the first and second rotor pieces, the skews being continuous between the third and fourth rotor pieces but being not continuous between the second and third rotor piece.Type: ApplicationFiled: November 30, 2005Publication date: July 27, 2006Applicant: Hitachi, LTD.Inventors: Kanako Nemoto, Yasushi Takano, Kazuhiko Takahashi, Kazuo Shima, Kazuo Nishihama