Patents by Inventor Susumu Tajima
Susumu Tajima 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: 7649299Abstract: It is made easy for a stator winding to be wound around a stator core and degradation in efficiency is prevented as much as possible. A stator (6) includes a plurality of phases, i.e., of circumferentially divided stator magnetic poles (6a, 6b, 6c). The stator magnetic poles (6a, 6b, 6c) are each composed of an arcuate stator core (13) having a plurality of axially extending claw poles (16b) and a circumferentially elliptically wound stator winding (14). The stator magnetic poles (6a, 6b, 6c) are magnetically divided; therefore, magnetic flux leakage is reduced to improve efficiency. Air flowing between the stator magnetic poles (6a, 6b, 6c) can improve a cooling effect.Type: GrantFiled: August 7, 2007Date of Patent: January 19, 2010Assignee: Hitachi, Ltd.Inventors: Hiroshi Kanazawa, Takayuki Koyama, Masashi Kitamura, Susumu Tajima, Kenya Takarai
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Publication number: 20100001605Abstract: A rotational machine which improves the reliability of the permanent magnets provided between claw poles by preventing shift in an axial direction during operation of the rotational machine. A stator and a rotor supported rotatably on an inner periphery of the stator are provided. The rotor has a pair of claw poles disposed in an alternately opposed orientation and having cylindrical field exciting coils on a central section. A permanent magnet is disposed between the claw poles. A holder retains the permanent magnets to a fixed position. The holder retains the permanent magnets between the claw poles by pressing on a side face of the claw poles as a result of an elastic force acting with respect to the rotational direction of the rotational machine.Type: ApplicationFiled: May 26, 2009Publication date: January 7, 2010Applicant: Hitachi, Ltd.Inventors: Susumu TAJIMA, Masami TAKANO, Yuichiro BABA
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Patent number: 7374000Abstract: To provide a vehicle driving apparatus capable of providing a sufficient driving force. A driving high-power generator is driven by an engine. A DC motor is driven directly by energy from the generator. A driving generator output voltage control circuit controls output voltage of the generator in accordance with the demanded driving force from the vehicle to control the motor.Type: GrantFiled: February 27, 2001Date of Patent: May 20, 2008Assignee: Hitachi, Ltd.Inventors: Tatsuyuki Yamamoto, Yoshinori Fukasaku, Keiichi Mashino, Yuuji Maeda, Susumu Tajima, Hisaya Shimizu, Keisuke Nishidate
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Publication number: 20080079322Abstract: It is made easy for a stator winding to be wound around a stator core and degradation in efficiency is prevented as much as possible. A stator 6 includes a plurality of phases, i.e., of circumferentially divided stator magnetic poles 6a, 6b, 6c. The stator magnetic poles 6a, 6b, 6c are each composed of an arcuate stator core 13 having a plurality of axially extending claw poles 16b and a circumferentially elliptically wound stator winding 14. The stator magnetic poles 6a, 6b, 6c are magnetically divided; therefore, magnetic flux leakage is reduced to improve efficiency. Air flowing between the stator magnetic poles 6a, 6b, 6c can improve a cooling effect.Type: ApplicationFiled: August 7, 2007Publication date: April 3, 2008Applicant: Hitachi, Ltd.Inventors: Hiroshi KANAZAWA, Takayuki Koyama, Masashi Kitamura, Susumu Tajima, Kenya Takarai
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Patent number: 7044255Abstract: An electric generating system for automobiles has a primary generator which is driven by an internal combustion engine of an automobile and supplies power to an electric load of the automobile and an electric motor for driving wheels of the automobile which are not driven by the internal combustion engine. A secondary generator is driven by the internal combustion engine and drives the motor. A control unit controls the secondary generator and the electric motor. The control circuit controls the output of the generator according to a driving force requested by the automobile, and the driving force of the electric motor is controlled by the output of the secondary generator.Type: GrantFiled: December 15, 2000Date of Patent: May 16, 2006Assignee: Hitachi, Ltd.Inventors: Yuuji Maeda, Keiichi Mashino, Hisaya Shimizu, Tatsuyuki Yamamoto, Yoshinori Fukasaku, Susumu Tajima, Toshiyuki Innami, Keisuke Mishidate
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Patent number: 7023113Abstract: An alternator for a vehicle includes a stator having a stator winding, a rotor opposing to the stator through a gap, a rectifier for converting AC power generated by the stator winding into DC power, a frame which holds the stator and has a cooling medium path at least one end thereof being opened, and an end plate for hermetically closing the opened end of the cooling medium path, wherein a cathode side rectifying element constituting the rectifier is fixed to a portion of the end plate not opposing to the cooling medium path, and a cooling member, at which an anode side rectifying element constituting the rectifier is fixed, is fixed to the end plate in an insulated state so that the anode side rectifying element is disposed at a position lower in temperature than a fixed position where the cathode side rectifying element is disposed.Type: GrantFiled: April 25, 2003Date of Patent: April 4, 2006Assignee: Hitachi, Ltd.Inventors: Susumu Tajima, Yuichiro Baba, Shinji Yamazaki
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Patent number: 6965173Abstract: The present invention provides a vehicle driving apparatus capable of being mounted easily even in a narrow space such as under-floor of the vehicle. The vehicle driving apparatus comprises a first and a second generators driven by an engine for driving front wheels, and a motor driven by receiving a power supply from the second generator to drive rear wheels, the first and second generators being installed in the vicinity of an engine within an engine room, the motor being arranged in the vicinity of a differential gear with which a reduction mechanism is integrated and is positioned substantially in a central part of the rear wheels.Type: GrantFiled: February 27, 2001Date of Patent: November 15, 2005Assignee: Hitachi, Ltd.Inventors: Yoshinori Fukasaku, Tatsuyuki Yamamoto, Yuuji Maeda, Keiichi Mashino, Susumu Tajima, Hisaya Shimizu, Keisuke Nishidate, Toshiyuki Innami
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Patent number: 6924580Abstract: The rotor of a vehicle alternator can firmly fasten the permanent magnets between claw-shaped magnetic poles. The rotor includes a Lundell type iron core having claw-shaped magnetic poles which are alternately arranged and opposed each other and include a centered cylindrical field winding, and a permanent magnet disposed between the claw-shaped magnetic poles for increasing the magnetic field. The permanent magnet is held by radial elastic force.Type: GrantFiled: April 23, 2003Date of Patent: August 2, 2005Assignee: Hitachi, Ltd.Inventors: Susumu Tajima, Shinji Yamazaki, Wasei Horioka, Masahiko Honma
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Patent number: 6917134Abstract: To reduce noise, there is provided an alternator for motor vehicles having a rotor and a stator which is mounted between a pair of brackets. In the alternator a stator core forming the stator is made up of laminations of thin sheets. And at least a part of the thin sheets making up the stator core are split into four divisions or more in the circumferential direction; the thin sheets of each layer being laid with splits thereof arranged alternately in the circumferential direction.Type: GrantFiled: February 26, 2001Date of Patent: July 12, 2005Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Makoto Hirama, Eiji Naito, Sakae Ishida, Susumu Sasaki, Kenichiro Matsubara, Shinji Yamazaki, Susumu Tajima, Yoshiaki Honda
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Patent number: 6864603Abstract: An automotive alternator comprises: a stator provided with a stator coil; a rotor supported for rotation in the stator to apply an alternative magnetic field to the stator; a regulator for regulating output; a rectifier for rectifying generated current; a plurality of housings holding the stator and the rotor; and a coolant path through which a coolant flows through at least one of the plurality of housings to transfer heat generated in the stator coil outside the automotive alternator. Fastening devices formed of a material having good heat conductance fasten the regulator and a heatsink for the regulator together to the housing at a position apart from the housing to transfer heat generated by the regulator to the housing. Thus, the automotive alternator can maintain a stable cooling ability in a hot atmosphere for a long time.Type: GrantFiled: January 8, 2003Date of Patent: March 8, 2005Assignee: Hitachi, Ltd.Inventors: Shinji Yamazaki, Wasei Horioka, Masami Takano, Susumu Tajima, Susumu Terumoto
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Publication number: 20050023909Abstract: An electric generator for use with an automotive vehicle having a liquid coolant system includes a main housing defining a closed interior chamber. A stator is mounted within the housing around the interior chamber while a liquid cooled passageway is formed in the housing around the stator. At least two fluid ports are open to the liquid coolant passageway adjacent opposite ends of the liquid coolant passageway and these fluid ports are adapted for fluid connection with the coolant system of the vehicle. A rotor having two axial ends is rotatably mounted to the housing within the interior chamber. A gas flow passageway is open at one end to the interior chamber adjacent one end of the rotor and is open at its other end to the interior chamber adjacent the other end of the rotor. A midportion of this gas flow passageway extends through a gas flow housing positioned exteriorly of the main housing and thermally coupled to the liquid coolant passageway in the main housing.Type: ApplicationFiled: September 3, 2004Publication date: February 3, 2005Inventors: Joseph Cromas, Susumu Tajima
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Publication number: 20040178696Abstract: (SubjectType: ApplicationFiled: April 23, 2003Publication date: September 16, 2004Applicant: HITACHI, LTD.Inventors: Susumu Tajima, Shinji Yamazaki, Wasei Horioka, Masahiko Honma
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Publication number: 20040135443Abstract: An alternator for a vehicle includes a stator having a stator winding, a rotor opposing to the stator through a gap, a rectifier for converting AC power generated by the stator winding into DC power, a frame which holds the stator and has a cooling medium path at least one end thereof being opened, and an end plate for hermetically closing the opened end of the cooling medium path, whereinType: ApplicationFiled: April 25, 2003Publication date: July 15, 2004Applicant: Hitachi, Ltd.Inventors: Susumu Tajima, Yuichiro Baba, Shinji Yamazaki
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Publication number: 20040000820Abstract: An electric generator for use with an automotive vehicle having a liquid coolant system includes a housing defining a closed interior chamber. A stator is mounted within the housing around the interior chamber while a liquid cooled passageway is formed in the housing around the stator. At least two fluid ports are open to the liquid coolant passageway adjacent opposite ends of the liquid coolant passageway and these fluid ports are adapted for fluid connection with the coolant system of the vehicle. A rotor having two axial ends is rotatably mounted to the housing within the interior chamber. A gas flow passageway is open at one end to the interior chamber adjacent one end of the rotor and is open at its other end to the interior chamber adjacent the other end of the rotor.Type: ApplicationFiled: June 13, 2002Publication date: January 1, 2004Inventors: Joseph Charles Cromas, Susumu Tajima
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Patent number: 6661109Abstract: The present invention provides a vehicle driving apparatus capable of being mounted easily even in a narrow space such as under-floor of the vehicle. The vehicle driving apparatus comprises a first and a second generators driven by an engine for driving front wheels, and a motor driven by receiving a power supply from the second generator to drive rear wheels, the first and second generators being installed in the vicinity of an engine within an engine room, the motor being arranged in the vicinity of a differential gear with which a reduction mechanism is integrated and is positioned substantially in a central part of the rear wheels.Type: GrantFiled: May 23, 2002Date of Patent: December 9, 2003Assignee: Hitachi, Ltd.Inventors: Yoshinori Fukasaku, Tatsuyuki Yamamoto, Yuuji Maeda, Keiichi Mashino, Susumu Tajima, Hisaya Shimizu, Keisuke Nishidate, Toshiyuki Innami
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Patent number: 6633098Abstract: An alternator for use in an automobile includes brackets for supporting a rotation shaft at both sides of a rotor, being thermally connected to a stator for supporting the stator, while one side of the rotor is closed by a bracket. A cooling water passage is provided in the bracket, a cooling fan is provided on the closed side of the rotor, and a cooling fin provided opposing to the cooling fan and in vicinity of the cooling water passage, thereby enabling cool down of the stator and the rotor, effectively, with low noises, and thereby obtaining a high power output.Type: GrantFiled: January 25, 2002Date of Patent: October 14, 2003Assignee: Hitachi, Ltd.Inventors: Toru Inaba, Hideaki Mori, Keizou Kawamura, Susumu Sasaki, Masami Takano, Susumu Tajima, Susumu Terumoto
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Patent number: 6621186Abstract: An alternator for vehicles, provided with a stator, a rotor, a rectifier and a voltage regulator, and comprising turbulent flow generating members 22 provided on heat transfer surfaces, through which heat generated from a field coil is transferred to a side of a bracket from a rotor, to generate convection of an air and turbulence of flow on downstream regions of recesses and projections, whereby a heat transfer performance from the rotor to the bracket is enhanced with a rotational frequency of the rotor.Type: GrantFiled: September 13, 2001Date of Patent: September 16, 2003Assignee: Hitachi, Ltd.Inventors: Keizou Kawamura, Hideaki Mori, Susumu Sasaki, Susumu Tajima, Masami Takano
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Publication number: 20030127920Abstract: An automotive alternator comprises: a stator provided with a stator coil; a rotor supported for rotation in the stator to apply an alternative magnetic field to the stator; a regulator for regulating output; a rectifier for rectifying generated current; a plurality of housings holding the stator and the rotor; and a coolant path through which a coolant flows through at least one of the plurality of housings to transfer heat generated in the stator coil outside the automotive alternator. Fastening devices formed of a material having good heat conductance fasten the regulator and a heatsink for the regulator together to the housing at a position apart from the housing to transfer heat generated by the regulator to the housing. Thus, the automotive alternator can maintain a stable cooling ability in a hot atmosphere for a long time.Type: ApplicationFiled: January 8, 2003Publication date: July 10, 2003Applicant: HITACHI LTD.Inventors: Shinji Yamazaki, Wasei Horioka, Masami Takano, Susumu Tajima, Susumu Terumoto
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Publication number: 20030042806Abstract: In an alternator for use in an automobile, comprising brackets 70 for supporting a rotation shaft 6 at both sides of a rotor 1, being thermally connected to a stator 12 for supporting the stator 12, while one side of the rotor 1 is closed by the bracket 70, cooling water passages 15 provided in the bracket 70, a cooling fan 51 provided on the closed side of the rotor 1, and a cooling fin provided opposing to and in vicinity of the cooling fan 15, thereby enabling cool down of the stator and the rotor, effectively, with low noises, and thereby obtaining a high power output.Type: ApplicationFiled: January 25, 2002Publication date: March 6, 2003Inventors: Toru Inaba, Hideaki Mori, Keizou Kawamura, Susumu Sasaki, Masami Takano, Susumu Tajima, Susumu Terumoto
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Publication number: 20020139592Abstract: The present invention provides a vehicle driving apparatus capable of being mounted easily even in a narrow space such as under-floor of the vehicle. The vehicle driving apparatus comprises a first and a second generators driven by an engine for driving front wheels, and a motor driven by receiving a power supply from the second generator to drive rear wheels, the first and second generators being installed in the vicinity of an engine within an engine room, the motor being arranged in the vicinity of a differential gear with which a reduction mechanism is integrated and is positioned substantially in a central part of the rear wheels.Type: ApplicationFiled: May 23, 2002Publication date: October 3, 2002Applicant: Hitachi, Ltd.Inventors: Yoshinori Fukasaku, Tatsuyuki Yamamoto, Yuuji Maeda, Keiichi Mashino, Susumu Tajima, Hisaya Shimizu, Keisuke Nishidate, Toshiyuki Innami