Patents by Inventor Minoru Kitabayashi
Minoru Kitabayashi 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: 7839039Abstract: A rotary shaft of a rotor including a magnet with a plurality of magnetic poles arranged at equal intervals on an outer circumference is supported at both ends by bearings. By externally fitting the inner ring of one bearing to the rotary shaft and holding it to be immovable in an axial direction and loosely fitting the outer ring of the bearing into the support hole and positioning it with belleville springs which are in contact resiliently with both sides, the rotary shaft and the rotor are supported so that they are movable in an axial direction within a movement amount of not greater than 2 mm according to a movement of the bearing caused against spring forces of the belleville springs.Type: GrantFiled: June 26, 2007Date of Patent: November 23, 2010Assignee: JTEKT CorporationInventors: Ken Matsubara, Tomofumi Takahashi, Tetsuo Horie, Minoru Kitabayashi
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Patent number: 7767084Abstract: An oil strainer in which pressure loss by a turbulent flow in a case (10) is reduced as much as possible. The oil strainer has the case (10) having an inflow opening (112) and an outflow opening (122) that are at positions separated from each other, and also has a filter member (20) provided so as to partition the inner space of the case (10) into a space (SI) on the inflow opening (112) side and a space (SO) on the outflow opening (122) side. A guiding surface (13) is provided in the case (10), and the guiding surface (13) has dam-like ribs (113, 123), extends via a position behind the outflow opening (122) when viewed from the inflow opening (112) side, and converges the flow of oil toward the outflow opening (122).Type: GrantFiled: June 29, 2006Date of Patent: August 3, 2010Assignees: NOK Corporation, Aisin AW Co., Ltd.Inventors: Kazunori Jinbo, Akihito Iwata, Minoru Kitabayashi, Daisuke Kitaoka
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Publication number: 20090045129Abstract: An oil strainer in which pressure loss by a turbulent flow in a case (b 10) is reduced as much as possible. The oil strainer has the case (10) having an inflow opening (112) and an outflow opening (122) that are at positions separated from each other, and also has a filter member (20) provided so as to partition the inner space of the case (10) into a space (SI) on the inflow opening (112) side and a space (SO) on the outflow opening (122) side. A guiding surface (13) is provided in the case (10), and the guiding surface (13) has dam-like ribs (113, 123), extends via a position behind the outflow opening (122) when viewed from the inflow opening (112) side, and converges the flow of oil toward the outflow opening (122).Type: ApplicationFiled: June 29, 2006Publication date: February 19, 2009Inventors: Kazunori Jinbo, Akihito Iwata, Minoru Kitabayashi, Daisuke Kitaoka
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Publication number: 20080174191Abstract: A rotary shaft of a rotor including a magnet with a plurality of magnetic poles arranged at equal intervals on an outer circumference is supported at both ends by bearings. By externally fitting the inner ring of one bearing to the rotary shaft and holding it to be immovable in an axial direction and loosely fitting the outer ring of the bearing into the support hole and positioning it with belleville springs which are in contact resiliently with both sides, the rotary shaft and the rotor are supported so that they are movable in an axial direction within a movement amount of not greater than 2 mm according to a movement of the bearing caused against spring forces of the belleville springs.Type: ApplicationFiled: June 26, 2007Publication date: July 24, 2008Inventors: Ken Matsubara, Tomofumi Takahashi, Tetsuo Horie, Minoru Kitabayashi
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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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Patent number: 6774521Abstract: In a brushless DC motor constructed by a rotor 2 to which a permanent magnet 3 is attached; and a stator 1 having a plurality of slots, when an effective opening angle of magnetic pole of the rotor 2 that was set to a predetermined opening angle whose base is the rotation axis of the rotor 2 is &thgr;2 and a salient area opening angle of magnetic pole formed within the effective opening angle &thgr;2 of magnetic pole is &thgr;3, the opening angles &thgr;2 and &thgr;3 are set so that cogging torque generated by the effective opening angle &thgr;2 of magnetic pole and cogging torque generated by the salient area opening angle &thgr;3 of magnetic pole are mutually in antiphase. Accordingly, a brushless DC motor capable of reducing cogging torque is realized.Type: GrantFiled: November 1, 2001Date of Patent: August 10, 2004Assignee: Koyo Seiko Co., Ltd.Inventors: Hirohide Inayama, Tomofumi Takahashi, Minoru Kitabayashi
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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: 20020171308Abstract: In a brushless DC motor constructed by a rotor 2 to which a permanent magnet 3 is attached; and a stator 1 having a plurality of slots, when an effective opening angle of magnetic pole of the rotor 2 that was set to a predetermined opening angle whose base is the rotation axis of the rotor 2 is &thgr;2 and a salient area opening angle of magnetic pole formed within the effective opening angle &thgr;2 of magnetic pole is &thgr;3, the opening angles &thgr;2 and &thgr;3 are set so that cogging torque generated by the effective opening angle &thgr;2 of magnetic pole and cogging torque generated by the salient area opening angle &thgr;3 of magnetic pole are mutually in antiphase. Accordingly, a brushless DC motor capable of reducing cogging torque is realized.Type: ApplicationFiled: November 1, 2001Publication date: November 21, 2002Applicant: Koyo Seiko Co. Ltd.Inventors: Hirohide Inayama, Tomofumi Takahashi, Minoru Kitabayashi
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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