Patents by Inventor Sadaaki Mori
Sadaaki Mori 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: 7174989Abstract: The power steering apparatus comprises a torque sensor for detecting a steering torque applied to a steering wheel and a steering assist motor which is driven to rotate based on the detected steering torque. The motor is driven under field weakening control in a high-speed rotation area. The motor is a brushless motor comprising a rotor having a plurality of permanent magnets which are respectively fixed in a plurality of recesses provided in a rotor core. With the electric power steering apparatus, a steer-assisting force can be obtained in high-speed steering.Type: GrantFiled: March 5, 2002Date of Patent: February 13, 2007Assignee: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hideki Jonokuchi, Hirohide Inayama, Atsushi Ishihara
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Patent number: 7176598Abstract: A bridge (8) in conformity with a tooth opening angle of the stator (1) is provided between a permanent magnet (5) and a permanent magnet (5) in a rotor (4), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (5). An opening angle of each of ribs (7) on both sides of the permanent magnet (5) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib (7) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet (5) is prevented.Type: GrantFiled: February 11, 2005Date of Patent: February 13, 2007Assignee: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hirohide Inayama, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Patent number: 7019426Abstract: A bridge (8) in conformity with a tooth opening angle of the stator (1) is provided between a permanent magnet (5) and a permanent magnet (5) in a rotor (4), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (5). An opening angle of each of ribs (7) on both sides of the permanent magnet (5) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib (7) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet (5) is prevented.Type: GrantFiled: February 11, 2005Date of Patent: March 28, 2006Assignee: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hirohide Inayama, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Patent number: 6956312Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.Type: GrantFiled: February 6, 2002Date of Patent: October 18, 2005Assignee: Koyo Seiko Co., Ltd.Inventors: Hirohide Inayama, Hideki Jonokuchi, Sadaaki Mori, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Patent number: 6943474Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.Type: GrantFiled: September 1, 2004Date of Patent: September 13, 2005Assignee: Koyo Seiko Co., Ltd.Inventors: Hirohide Inayama, Hideki Jonokuchi, Sadaaki Mori, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20050134133Abstract: A bridge (8) in conformity with a tooth opening angle of the stator (1) is provided between a permanent magnet (5) and a permanent magnet (5) in a rotor (4), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (5). An opening angle of each of ribs (7) on both sides of the permanent magnet (5) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib (7) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet (5) is prevented.Type: ApplicationFiled: February 11, 2005Publication date: June 23, 2005Applicant: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hirohide Inayama, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20050134134Abstract: A bridge (8) in conformity with a tooth opening angle of the stator (1) is provided between a permanent magnet (5) and a permanent magnet (5) in a rotor (4), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (5). An opening angle of each of ribs (7) on both sides of the permanent magnet (5) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib (7) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet (5) is prevented.Type: ApplicationFiled: February 11, 2005Publication date: June 23, 2005Applicant: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hirohide Inayama, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Patent number: 6885125Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.Type: GrantFiled: September 1, 2004Date of Patent: April 26, 2005Assignee: Koyo Seiko Co., Ltd.Inventors: Hirohide Inayama, Hideki Jonokuchi, Sadaaki Mori, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Patent number: 6867526Abstract: A bridge (8) in conformity with a tooth opening angle of the stator (1) is provided between a permanent magnet (5) and a permanent magnet (5) in a rotor (4), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (5). An opening angle of each of ribs (7) on both sides of the permanent magnet (5) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib (7) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet (5) is prevented.Type: GrantFiled: September 4, 2002Date of Patent: March 15, 2005Assignee: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hirohide Inayama, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20050029888Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.Type: ApplicationFiled: September 1, 2004Publication date: February 10, 2005Applicant: Koyo Seiko Co., Ltd.Inventors: Hirohide Inayama, Hideki Jonokuchi, Sadaaki Mori, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20050023927Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.Type: ApplicationFiled: September 1, 2004Publication date: February 3, 2005Applicant: Koyo Seiko Co., Ltd.Inventors: Hirohide Inayama, Hideki Jonokuchi, Sadaaki Mori, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20030080642Abstract: A bridge (8) in conformity with a tooth opening angle of the stator (1) is provided between a permanent magnet (5) and a permanent magnet (5) in a rotor (4), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (5). An opening angle of each of ribs (7) on both sides of the permanent magnet (5) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib (7) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet (5) is prevented.Type: ApplicationFiled: September 4, 2002Publication date: May 1, 2003Applicant: KOYO SEIKO CO., LTD.Inventors: Sadaaki Mori, Hirohide Inayama, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20020140308Abstract: A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction.Type: ApplicationFiled: February 6, 2002Publication date: October 3, 2002Applicant: KOYO SEIKO CO. LTD.Inventors: Hirohide Inayama, Hideki Jonokuchi, Sadaaki Mori, Atsushi Ishihara, Tomofumi Takahashi, Minoru Kitabayashi, Tetsuo Horie
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Publication number: 20020125064Abstract: The power steering apparatus comprises a torque sensor for detecting a steering torque applied to a steering wheel and a steering assist motor which is driven to rotate based on the detected steering torque. The motor is driven under field weakening control in a high-speed rotation area. The motor is a brushless motor comprising a rotor having a plurality of permanent magnets which are respectively fixed in a plurality of recesses provided in a rotor core. With the electric power steering apparatus, a steer-assisting force can be obtained in high-speed steering.Type: ApplicationFiled: March 5, 2002Publication date: September 12, 2002Applicant: Koyo Seiko Co., Ltd.Inventors: Sadaaki Mori, Hideki Jonokuchi, Hirohide Inayama, Atsushi Ishihara
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Patent number: 4937696Abstract: A protection circuit for a semiconductor device is disclosed. This circuit is connected in series with a power semiconductor device to be protected, and is comprised of a circuit breaker and current-limiting device. The current-limiting device limits the overcurrent, thereby providing a time allowance until the circuit breaker begins operate.Type: GrantFiled: May 11, 1989Date of Patent: June 26, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Hisashi Yoshino, Noburu Fukushima, Masakatsu Haga, Masachika Iida, Sadaaki Mori