Patents by Inventor Mitsuaki Mirumachi
Mitsuaki Mirumachi 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: 10666109Abstract: The coil ends in a rotating electric machine are to be made smaller in size. A stator coil 60 inserted into a slot 420 in a stator of a rotating electric machine is formed with segment coils 28 connected to one another. In the stator coil 60, the segment coils 28 each include an insulating coated portion coated with an insulating coating, and a slit 900 or a recess is formed in the insulating coated portion of each of the segment coils 28 at a coil end 140. The slit 900 or the recess is preferably formed between a diagonal conductor portion 28D and a conductor-end straight portion 28E of each segment coil 28.Type: GrantFiled: July 27, 2016Date of Patent: May 26, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Kenichi Nakayama, Tomohiro Fukuda, Takashi Genmoto, Hiromitsu Okamoto, Mitsuaki Mirumachi, Yutaka Matsunobu
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Publication number: 20190267861Abstract: The coil ends in a rotating electric machine are to be made smaller in size. A stator coil 60 inserted into a slot 420 in a stator of a rotating electric machine is formed with segment coils 28 connected to one another. In the stator coil 60, the segment coils 28 each include an insulating coated portion coated with an insulating coating, and a slit 900 or a recess is formed in the insulating coated portion of each of the segment coils 28 at a coil end 140. The slit 900 or the recess is preferably formed between a diagonal conductor portion 28D and a conductor-end straight portion 28E of each segment coil 28.Type: ApplicationFiled: July 27, 2016Publication date: August 29, 2019Applicant: Hitachi Automotive Systems, Ltd.Inventors: Kenichi NAKAYAMA, Tomohiro FUKUDA, Takashi GENMOTO, Hiromitsu OKAMOTO, Mitsuaki MIRUMACHI, Yutaka MATSUNOBU
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Patent number: 9906086Abstract: A rotating electric machine having downsized coil ends is provided. In a rotating electric machine having a stator 130 including a stator core 132 formed with a plurality of slots 420 rowed in a circumferential direction and a stator coil 138 inserted into the slots of the stator core, and a rotor 150 disposed rotatably with respect to the stator core with a clearance interposed therebetween. The stator coil is formed by a plurality of segment coils 28 being connected, the segment coils 28 being made of a conductor shaped into a rough U-shape and having a rectangular cross-section. The segment coil has at an end a connection portion 800 connected to another segment coil, the connection portion having a corner portion 810.Type: GrantFiled: July 29, 2013Date of Patent: February 27, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kenichi Nakayama, Tomohiro Fukuda, Masamichi Kase, Hiroshi Matahira, Kazuo Ojima, Dai Nakamura, Shin Onose, Mitsuaki Mirumachi, Hisaya Shimizu
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Publication number: 20150222155Abstract: A rotating electric machine having downsized coil ends is provided. In a rotating electric machine having a stator 130 including a stator core 132 formed with a plurality of slots 420 rowed in a circumferential direction and a stator coil 138 inserted into the slots of the stator core, and a rotor 150 disposed rotatably with respect to the stator core with a clearance interposed therebetween. The stator coil is formed by a plurality of segment coils 28 being connected, the segment coils 28 being made of a conductor shaped into a rough U-shape and having a rectangular cross-section. The segment coil has at an end a connection portion 800 connected to another segment coil, the connection portion having a corner portion 810.Type: ApplicationFiled: July 29, 2013Publication date: August 6, 2015Inventors: Kenichi Nakayama, Tomohiro Fukuda, Masamichi Kase, Hiroshi Matahira, Kazuo Ojima, Dai Nakamura, Shin Onose, Mitsuaki Mirumachi, Hisaya Shimizu
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Publication number: 20130221781Abstract: Provided is a rotating electrical machine including: a cylinder-shaped housing that includes a plurality of flanges installed to a casing; a stator that includes a cylinder-shaped stator core fixed to the housing through shrinkage fit or press fit; and a rotor that is arranged inside the stator so as to be rotatable, in which, in the stator core, a plurality of steel sheets is stacked, and welding portions used for suppressing deformation of the steel sheets are arranged at positions in the stator core that correspond to the flanges of the housing.Type: ApplicationFiled: November 1, 2011Publication date: August 29, 2013Applicant: Hitachi Automotive Systems, Ltd.Inventors: Kenichi Nakayama, Tsuyoshi Goto, Hiromitsu Okamoto, Tomohiro Adachi, Mitsuaki Mirumachi, Kou Ajima
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Patent number: 8018104Abstract: A small-sized motor for electric power steering, in which coil connection can be easily performed with space saving, and a method for manufacturing the motor. Multi-phase stator coils assembled in a stator coil are connected per phase by connecting rings at coil ends of the stator coils. A bus bar supplied with electric power from the exterior is stacked onto the connecting rings in the axial direction of the motor and is electrically connected to the connecting rings.Type: GrantFiled: March 17, 2010Date of Patent: September 13, 2011Assignee: Hitachi, Ltd.Inventors: Masamichi Yagai, Mitsuaki Mirumachi, Toshiaki Ueda, Shin Onose
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Publication number: 20100187924Abstract: A small-sized motor for electric power steering, in which coil connection can be easily performed with space saving, and a method for manufacturing the motor. Multi-phase stator coils assembled in a stator coil are connected per phase by connecting rings at coil ends of the stator coils. A bus bar supplied with electric power from the exterior is stacked onto the connecting rings in the axial direction of the motor and is electrically connected to the connecting rings.Type: ApplicationFiled: March 17, 2010Publication date: July 29, 2010Applicant: HITACHI, LTD.Inventors: Masamichi YAGAI, Mitsuaki MIRUMACHI, Toshiaki UEDA, Shin Onose
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Patent number: 7723878Abstract: A small-sized motor for electric power steering, in which coil connection can be easily performed with space saving, and a method for manufacturing the motor. Multi-phase stator coils assembled in a stator coil are connected per phase by connecting rings at coil ends of the stator coils. A bus bar supplied with electric power from the exterior is stacked onto the connecting rings in the axial direction of the motor and is electrically connected to the connecting rings.Type: GrantFiled: December 28, 2005Date of Patent: May 25, 2010Assignee: Hitachi, Ltd.Inventors: Masamichi Yagai, Mitsuaki Mirumachi, Toshiaki Ueda, Shin Onose
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Patent number: 7683516Abstract: A stator of a rotating electric machine includes a stator core, and multiphase stator coils incorporated in the stator core. The stator core is formed by connecting a plurality of split core pieces. Each of the stator coils is wound around a coil bobbin installed on the outer periphery of the tooth portion of a respective one of the core pieces, by a concentrated winding method; and around mutually adjacent tooth portions, the respective coils that have the same phase and mutually different in the winding direction are continuously wound. A crossover wire for connecting the first stator coil wound around the first tooth portion and the second stator coil wound around the second tooth portion, is located at a position further toward the central side in the axial direction of the coil bobbin than the end portion of the coil bobbin, inclusive of this end portion.Type: GrantFiled: May 26, 2006Date of Patent: March 23, 2010Assignee: Hitachi, Ltd.Inventors: Takashi Ishigami, Masashi Kitamura, Osamu Koizumi, Mitsuaki Mirumachi
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Publication number: 20090039729Abstract: The stator core of a motor comprises an annular back core, and a plurality of tees created separately from the back core and secured onto the inner periphery of the back core. A stator coil is wound on each of the tees by a distributed or concentrated winding method. The stator core and stator coil are formed by molding.Type: ApplicationFiled: October 14, 2008Publication date: February 12, 2009Applicant: HITACHI, LTDInventors: Toshiyuki Innami, Mitsuaki Mirumachi, Osamu Koizumi, Masamichi Yagai, Masashi Kitamura, Takashi Ishigami
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Patent number: 7453179Abstract: The stator core of a motor comprises an annular back core, and a plurality of tees created separately from the back core and secured onto the inner periphery of the back core. A stator coil is wound on each of the tees by a distributed or concentrated winding method. The stator core and stator coil are formed by molding.Type: GrantFiled: May 31, 2007Date of Patent: November 18, 2008Assignee: Hitachi, Ltd.Inventors: Toshiyuki Innami, Mitsuaki Mirumachi, Osamu Koizumi, Masamichi Yagai, Masashi Kitamura, Takashi Ishigami
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Publication number: 20070222330Abstract: The stator core of a motor comprises an annular back core, and a plurality of tees created separately from the back core and secured onto the inner periphery of the back core. A stator coil is wound on each of the tees by a distributed or concentrated winding method. The stator core and stator coil are formed by molding.Type: ApplicationFiled: May 31, 2007Publication date: September 27, 2007Applicant: HITACHI, LTD.Inventors: Toshiyuki INNAMI, Mitsuaki MIRUMACHI, Osamu KOIZUMI, Masamichi YAGAI, Masashi KITAMURA, Takashi ISHIGAMI
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Patent number: 7242128Abstract: The stator core of a motor comprises an annular back core, and a plurality of tees created separately from the back core and secured onto the inner periphery of the back core. A stator coil is wound on each of the tees by a distributed or concentrated winding method. The stator core and stator coil are formed by molding.Type: GrantFiled: May 25, 2005Date of Patent: July 10, 2007Assignee: Hitachi, Ltd.Inventors: Toshiyuki Innami, Mitsuaki Mirumachi, Osamu Koizumi, Masamichi Yagai, Masashi Kitamura, Takashi Ishigami
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Publication number: 20060279146Abstract: A stator of a rotating electric machine includes a stator core, and multiphase stator coils incorporated in the stator core. The stator core is formed by connecting a plurality of split core pieces. Each of the stator coils is wound around a coil bobbin installed on the outer periphery of the tooth portion of a respective one of the core pieces, by a concentrated winding method; and around mutually adjacent tooth portions, the respective coils that have the same phase and mutually different in the winding direction are continuously wound. A crossover wire for connecting the first stator coil wound around the first tooth portion and the second stator coil wound around the second tooth portion, is located at a position further toward the central side in the axial direction of the coil bobbin than the end portion of the coil bobbin, inclusive of this end portion.Type: ApplicationFiled: May 26, 2006Publication date: December 14, 2006Applicant: Hitachi, Ltd.Inventors: Takashi Ishigami, Masashi Kitamura, Osamu Koizumi, Mitsuaki Mirumachi
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Publication number: 20060169526Abstract: An electric power steering system having high performance and high reliability. The electric power steering system employs, as a power supply, a wound lead storage battery in which a thin band-shaped positive plate, a thin band-shaped negative plate, and a band-shaped separator interposed between the positive and negative plates are wound to form a plate group and the plate group is immersed in an electrolyte. In a motor used for electric power steering, a plate-shaped conductor is employed as a connecting ring for electrical connection between a cable for introducing multi-phase AC power to stator coils and the stator coils.Type: ApplicationFiled: December 14, 2005Publication date: August 3, 2006Applicant: Hitachi, Ltd.Inventors: Kyoko Honbo, Masanori Sakai, Toshiyuki Innami, Mitsuaki Mirumachi, Shoji Sasaki, Masashi Kitamura, Fumio Tajima, Shinji Shirakawa
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Publication number: 20060138883Abstract: A small-sized motor for electric power steering, in which coil connection can be easily performed with space saving, and a method for manufacturing the motor. Multi-phase stator coils assembled in a stator coil are connected per phase by connecting rings at coil ends of the stator coils. A bus bar supplied with electric power from the exterior is stacked onto the connecting rings in the axial direction of the motor and is electrically connected to the connecting rings.Type: ApplicationFiled: December 28, 2005Publication date: June 29, 2006Applicant: HITACHI, LTD.Inventors: Masamichi Yagai, Mitsuaki Mirumachi, Toshiaki Ueda, Shin Onose
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Publication number: 20060138894Abstract: An object of the present invention is to provide a rotor with a high accuracy, a manufacturing method of the rotor and the motor for an electrically driven power steering in a manner that the accuracy of a shaft itself is not degraded, then a core is not applied with excessive deformation, and the shaft and the core are joined while maintaining the accuracy of each of these parts. A rotor is configured by a rotor core which is formed by laminating a plurality of silicon steel plates and has a through hole at the center thereof, and a shaft which is pressed into the through hole of the rotor core. The rotor core is locally annealed only at a portion near the surface of the through hole.Type: ApplicationFiled: December 28, 2005Publication date: June 29, 2006Applicant: HITACHI LTD.Inventors: Kouji Harada, Mitsuaki Mirumachi
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Publication number: 20050269895Abstract: The stator core of a motor comprises an annular back core, and a plurality of tees created separately from the back core and secured onto the inner periphery of the back core. A stator coil is wound on each of the tees by a distributed or concentrated winding method. The stator core and stator coil are formed by molding.Type: ApplicationFiled: May 25, 2005Publication date: December 8, 2005Applicant: Hitachi, Ltd.Inventors: Toshiyuki Innami, Mitsuaki Mirumachi, Osamu Koizumi, Masamichi Yagai, Masashi Kitamura, Takashi Ishigami
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Patent number: 6404086Abstract: A permanent-magnet type brushless motor has a rotor which is made by integrally forming a rotating magnetic pole comprising a cylindrical multi-pole anisotropic magnet, a shaft and an elastic insulating supporting member having rigidity lower than at least that of the shaft. The multi-pole anisotropic magnet causes its magnetic flux to flow to form the closed magnetic circuit, thereby eliminating the necessity of forming the closed magnetic circuit using an inner stator core in the magnet required for the radial anisotropic magnet. A cylindrical casing holding therein a stator core.Type: GrantFiled: September 15, 1997Date of Patent: June 11, 2002Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Yoshinori Fukasaku, Mitsuaki Mirumachi, Hideo Tatsumi
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Patent number: 5716200Abstract: A motor 2 has a motor flange 6 for supporting the weight of the motor and is installed on a blower casing 5. The motor flange 6 has a dimension in the radial direction of the motor which is smaller than the outer diameter of the fan 1 and extends in the radial direction of the motor 2 from an outer peripheral portion of the motor 2. A motor casing 5 is formed by a flange portion 5a having an outside installing portion 5m and an inside supporting portion 5n, and a cylindrical shaped housing portion 5b. The outside installing portion 5m has a dimension in the radial direction of the motor which is larger than the outer diameter of the fan 1 and the inside supporting portion 5n has a dimension in the radial direction of the motor which is smaller than the outer diameter of the fan 1. The motor 2 is installed on the blower casing 4 through the outside installing portion 5m of the motor casing 5.Type: GrantFiled: April 18, 1996Date of Patent: February 10, 1998Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Mitsuaki Mirumachi, Mitsuo Ujiie, Yoshinori Fukasaku, Takashi Yokoyama