Patents by Inventor Motofumi Otsuji
Motofumi Otsuji 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: 8674578Abstract: A stator includes a core and a coil group. The core includes a ring portion, and a teeth portion preferably including twelve teeth portions projecting from an inside of the ring portion toward a center thereof. The coil group preferably includes twelve coils arranged in each of the teeth portions. The core is defined by coupling twelve cores which respectively include a teeth portion. The coil group preferably includes six coil pairs each including two coils joined to each other by a single conductive line. When the core is divided into a phase region and a neutral region equally along the axial direction, a first group of coils in each of the six coil pairs are arranged in the phase region, and the other coils are arranged in the neutral region.Type: GrantFiled: February 23, 2010Date of Patent: March 18, 2014Assignee: Nidec CorporationInventors: Masato Aono, Keisuke Fukunaga, Motofumi Otsuji
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Patent number: 8350441Abstract: A motor includes a shaft, a rotor, a stator, and a housing. The stator preferably includes a core including a plurality of teeth, a plurality of coils, and electrically insulating tubes. The core is defined by a combination of a plurality of unit cores each of which has a separate one of the teeth. The plurality of coils include two or more continuous coils defined by a single line of a conductor wire. Each of the electrically insulating tubes is arranged to cover at least a portion of the conductor wire which passes between the continuous coils.Type: GrantFiled: July 29, 2010Date of Patent: January 8, 2013Assignee: Nidec CorporationInventors: Keisuke Fukunaga, Motofumi Otsuji, Masato Aono
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Patent number: 8138644Abstract: A motor includes a plurality of bus wires of a common phase which are put together before being guided in a common passage to minimize the space arranged to guide the bus wires. Also, the bus wires of a common phase are easily insulated from those of different phases, and an axial height of the motor is reduced. Further, a radial width necessary to guide the bus wires is reduced, and an axial height of the motor including a sensor portion which detects a rotary position of the motor is reduced. Also, the bus wires are easily extended from the armature, and an amount of work required to connect the bus wires and the terminals is reduced. Furthermore, the connection terminal portion does not interfere with the bus wires when they are being guided.Type: GrantFiled: July 28, 2008Date of Patent: March 20, 2012Assignee: Nidec CorporationInventors: Nakaba Kataoka, Motofumi Otsuji, Yoshiaki Yamashita
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Publication number: 20110297474Abstract: A stator includes a core and a coil group. The core includes a ring portion, and a teeth portion preferably including twelve teeth portions projecting from an inside of the ring portion toward a center thereof. The coil group preferably includes twelve coils arranged in each of the teeth portions. The core is defined by coupling twelve cores which respectively include a teeth portion. The coil group preferably includes six coil pairs each including two coils joined to each other by a single conductive line. When the core is divided into a phase region and a neutral region equally along the axial direction, a first group of coils in each of the six coil pairs are arranged in the phase region, and the other coils are arranged in the neutral region.Type: ApplicationFiled: February 23, 2010Publication date: December 8, 2011Applicant: NIDEC CORPORATIONInventors: Masato Aono, Keisuke Fukunaga, Motofumi Otsuji
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Publication number: 20110025148Abstract: A motor includes a shaft, a rotor, a stator, and a housing. The stator preferably includes a core including a plurality of teeth, a plurality of coils, and electrically insulating tubes. The core is defined by a combination of a plurality of unit cores each of which has a separate one of the teeth. The plurality of coils include two or more continuous coils defined by a single line of a conductor wire. Each of the electrically insulating tubes is arranged to cover at least a portion of the conductor wire which passes between the continuous coils.Type: ApplicationFiled: July 29, 2010Publication date: February 3, 2011Applicant: NIDEC CORPORATIONInventors: Keisuke FUKUNAGA, Motofumi OTSUJI, Masato AONO
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Publication number: 20100201213Abstract: A motor includes a plurality of bus wires of a common phase which are put together before being guided in a common passage to minimize the space arranged to guide the bus wires. Also, the bus wires of a common phase are easily insulated from those of different phases, and an axial height of the motor is reduced. Further, a radial width necessary to guide the bus wires is reduced, and an axial height of the motor including a sensor portion which detects a rotary position of the motor is reduced. Also, the bus wires are easily extended from the armature, and an amount of work required to connect the bus wires and the terminals is reduced. Furthermore, the connection terminal portion does not interfere with the bus wires when they are being guided.Type: ApplicationFiled: July 28, 2008Publication date: August 12, 2010Applicant: NIDEC CORPORATIONInventors: Nakaba Kataoka, Motofumi Otsuji, Yoshiaki Yamashita
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Patent number: 7579735Abstract: A motor stator in one implementation includes a plurality of teeth disposed in a radial form centered about a predetermined center axis, insulators covering the plurality of teeth, and a plurality of coils provided on each of the plurality of teeth by winding conductors onto the insulators through to multiple layers. At one axial end of the plurality of areas where the insulators cover each of the plurality of teeth, the radius of curvature of the conductor windings on the ending side is larger than the radius of curvature on the starting side. The insulators in a motor stator in another implementation are provided with a first partition and a second partition that, relative to the axial center of the plurality of teeth, respectively cover one side and the other side each tooth.Type: GrantFiled: October 18, 2007Date of Patent: August 25, 2009Assignee: Nidec CorporationInventor: Motofumi Otsuji
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Patent number: 7514829Abstract: A busbar unit includes a busbar holder and a plurality of busbars. The busbar holder has a first surface and a second surface on both sides in an axial direction, respectively. The first surface is provided with grooves in which one or more busbars are accommodated. The busbar in the groove of the first surface is provided with a wire connector portion on the first surface. The second surface is also provided with grooves accommodating remaining busbar(s) therein. The busbar(s) in the groove of the second surface is provided with a wire connector portion on the second surface. To each wire connector portion, a conductive wire forming a coil winding of an armature of a motor is connected.Type: GrantFiled: April 1, 2008Date of Patent: April 7, 2009Assignee: Nidec CorporationInventors: Motofumi Otsuji, Nakaba Kataoka
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Publication number: 20080242124Abstract: A busbar unit includes a busbar holder and a plurality of busbars. The busbar holder has a first surface and a second surface on both sides in an axial direction, respectively. The first surface is provided with grooves in which one or more busbars are accommodated. The busbar in the groove of the first surface is provided with a wire connector portion on the first surface. The second surface is also provided with grooves accommodating remaining busbar (s) therein. The busbar (s) in the groove of the second surface is provided with a wire connector portion on the second surface. To each wire connector portion, a conductive wire forming a coil winding of an armature of a motor is connected.Type: ApplicationFiled: April 1, 2008Publication date: October 2, 2008Applicant: NIDEC CORPORATIONInventors: Motofumi OTSUJI, Nakaba KATAOKA
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Publication number: 20080042512Abstract: A motor stator in one implementation includes a plurality of teeth disposed in a radial form centered about a predetermined center axis, insulators covering the plurality of teeth, and a plurality of coils provided on each of the plurality of teeth by winding conductors onto the insulators through to multiple layers. At one axial end of the plurality of areas where the insulators cover each of the plurality of teeth, the radius of curvature of the conductor windings on the ending side is larger than the radius of curvature on the starting side. The insulators in a motor stator in another implementation are provided with a first partition and a second partition that, relative to the axial center of the plurality of teeth, respectively cover one side and the other side each tooth.Type: ApplicationFiled: October 18, 2007Publication date: February 21, 2008Applicant: NIDEC CORPORATIONInventor: Motofumi OTSUJI
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Patent number: 7291955Abstract: A motor stator in one implementation includes a plurality of teeth disposed in a radial form centered about a predetermined center axis, insulators covering the plurality of teeth, and a plurality of coils provided on each of said plurality of teeth by winding conductors onto the insulators through to multiple layers. At one axial end of the plurality of areas where the insulators cover each of the plurality of teeth, the radius of curvature of the conductor windings on the ending side is larger than the radius of curvature on the starting side. The insulators in a motor stator in another implementation are provided with a first partition and a second partition that, relative to the axial center of the plurality of teeth, respectively cover one side and the other side each tooth.Type: GrantFiled: July 27, 2005Date of Patent: November 6, 2007Assignee: Nidec CorporationInventor: Motofumi Otsuji
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Publication number: 20060022549Abstract: Motor stator in which a plurality of first guide grooves (321) and second guide grooves (322) that govern the winding position of conductors are formed on the upper end portion and lower end portion of insulators (32) which cover each of the stator teeth (31). The inclination of the first guide grooves is equal to the pitch of the first guide grooves, and the inclination of the second guide grooves is configured to be 0. The second-guide-groove start and end points are positioned on a straight line extending in the (?Z) direction from the first-guide-groove end point (3212) and from the adjoining first-guide-groove start point (3211) on the (?Y) side.Type: ApplicationFiled: July 27, 2005Publication date: February 2, 2006Applicant: Nidec CorporationInventor: Motofumi Otsuji
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Publication number: 20060022550Abstract: A motor stator in one implementation includes a plurality of teeth disposed in a radial form centered about a predetermined center axis, insulators covering the plurality of teeth, and a plurality of coils provided on each of said plurality of teeth by winding conductors onto said insulators through to multiple layers. At one axial end of the plurality of areas where said insulators cover each of said plurality of teeth, the radius of curvature of the conductor windings on the ending side is larger than the radius of curvature on the starting side. The insulators in a motor stator in another implementation are provided with a first partition and a second partition that, relative to the axial center of the plurality of teeth, respectively cover one side and the other side each tooth.Type: ApplicationFiled: July 27, 2005Publication date: February 2, 2006Applicant: Nidec CorporationInventor: Motofumi Otsuji