Patents by Inventor Keiji Oda
Keiji Oda 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: 20100225464Abstract: The present invention provides a tire state variables management system where an external module can reliably receive data from a specific sensor module from which data is to be acquired when an external module transmits to the sensor module a command signal for requesting data transmission. Each sensor module 3 possesses a self-identifying code for distinguishing itself from other sensor modules; the command signal transmitted by the external module 2 includes the self-identifying code possessed by the sensor module 3 from which data is to be acquired; and the sensor module 3 is adapted to transmit the data only when the self-identifying code included in the command signal from the external module 2 coincides with the self-identifying code possessed by itself.Type: ApplicationFiled: August 28, 2008Publication date: September 9, 2010Applicant: BRIDGESTONE CORPORATIONInventor: Keiji Oda
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Patent number: 7791461Abstract: A tire management system includes a sensor module secured to inside of a tire that is mounted on a vehicle, for measuring a tire state value and transmitting the measured data to the vehicle side, and a receiver module secured to the vehicle side for transmitting a signal demanding the measured data to the sensor module at a predetermined cycle and receiving the measured data transmitted from the sensor module. The sensor module measures a tire status value at a predetermined cycle, judges whether the measured data is out of a predetermined normal range, and immediately transmits the measured data and an abnormal state data through a predetermined channel exclusively used for transmitting the abnormal state data to the receiver module, if the data is judged to be out of the normal range. With this structure, if an abnormal state occurs, the receiver module can receive the abnormality without any delay, while preventing shortening of the cell life.Type: GrantFiled: June 3, 2005Date of Patent: September 7, 2010Assignee: Bridgestone CorporationInventors: Keiji Oda, Koji Takao
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Patent number: 7667365Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: GrantFiled: July 18, 2008Date of Patent: February 23, 2010Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20100033316Abstract: In a tire information management system 10 of the present invention, a vehicle side module 5 includes a receiving electromagnetic wave strength measuring means 12 for measuring, for each sensor module 3, receiving electromagnetic wave strength of data signals transmitted from the sensor module 3 and is adapted to generate a transmitting electromagnetic wave strength set value to be employed in the next data transmission by the sensor module in accordance with the receiving electromagnetic wave strength of the data signals transmitted from the sensor module and add the transmitting electromagnetic wave strength set value to a command to the sensor module at the next request of data transmission thereto. The sensor module 3 includes a transmitting electromagnetic wave strength control means 16 for controlling transmitting electromagnetic wave strength in data transmission.Type: ApplicationFiled: October 2, 2007Publication date: February 11, 2010Applicant: BRIDGESTONE CORPORATIONInventor: Keiji Oda
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Publication number: 20090174275Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio TAJIMA, Yataka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20090174276Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio TAJIMA, Yataka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20090174274Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio TAJIMA, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20080284269Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: July 18, 2008Publication date: November 20, 2008Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20080284270Abstract: A rotating electric machine comprises a stator having stator salient poles, three-phases windings would around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said stator salient poles. The three-phase windings are concentratively wound around each of the stator salient poles, with windings of each phase wound around at more than one stator salient pole. The windings of each phase have a phase difference of voltage between at least one of the windings and the other.Type: ApplicationFiled: July 24, 2008Publication date: November 20, 2008Applicants: HITACHI, LTD., HITACHI CAR ENGINEERING CO., LTD.Inventors: Fumio TAJIMA, Yutaka Matsunobe, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Patent number: 7446448Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: GrantFiled: August 25, 2006Date of Patent: November 4, 2008Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Patent number: 7378773Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: GrantFiled: August 25, 2006Date of Patent: May 27, 2008Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20070252685Abstract: A tire management system includes a sensor module secured to inside of a tire that is mounted on a vehicle, for measuring a tire state value and transmitting the measured data to the vehicle side, and a receiver module secured to the vehicle side for transmitting a signal demanding the measured data to the sensor module at a predetermined cycle and receiving the measured data transmitted from the sensor module. The sensor module measures a tire status value at a predetermined cycle, judges whether the measured data is out of a predetermined normal range, and immediately transmits the measured data and an abnormal state data through a predetermined channel exclusively used for transmitting the abnormal state data to the receiver module, if the data is judged to be out of the normal range. With this structure, if an abnormal state occurs, the receiver module can receive the abnormality without any delay, while preventing shortening of the cell life.Type: ApplicationFiled: June 3, 2005Publication date: November 1, 2007Applicant: Bridgestone CorporationInventors: Keiji Oda, Koji Takao
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Publication number: 20060284508Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: August 25, 2006Publication date: December 21, 2006Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20060279154Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: August 25, 2006Publication date: December 14, 2006Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Patent number: 7119470Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: GrantFiled: March 17, 2005Date of Patent: October 10, 2006Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20060017344Abstract: A rotating electric machine comprises a stator having stator salient poles, three-phases windings wound around the stator salient poles, a rotor rotatable held inside the stator, and permanent magnets inserted into the rotor and positioned opposite to the stator salient poles. Three-phase windings, which are concentratively wound around each of the stator salient poles, are wound around more than one stator salient pole. The windings of each phase have a phase difference of voltage between at least one of the windings and the other.Type: ApplicationFiled: September 26, 2005Publication date: January 26, 2006Applicant: HITACHI., LTD.Inventors: Fumio Tajima, Yutaka Matsunobe, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Patent number: 6949856Abstract: A rotating electric machine comprises a stator having stator salient poles, three-phases windings wound around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said stator salient poles, wherein said three-phase windings are concentratively wound around each of said stator salient poles, said windings of each phase are wound around at more than one stator salient p9ole, and said windings of each phase have a phase difference of voltage between at least one of the windings and the other.Type: GrantFiled: March 16, 2004Date of Patent: September 27, 2005Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobe, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20050162029Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: March 17, 2005Publication date: July 28, 2005Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Patent number: 6876117Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: GrantFiled: September 7, 2004Date of Patent: April 5, 2005Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda
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Publication number: 20050023920Abstract: A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.Type: ApplicationFiled: September 7, 2004Publication date: February 3, 2005Inventors: Fumio Tajima, Yutaka Matsunobu, Shouichi Kawamata, Suetaro Shibukawa, Osamu Koizumi, Keiji Oda