Patents by Inventor Takushi Takizawa
Takushi Takizawa 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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Publication number: 20200361025Abstract: A pressure receiving surface inclined to a rotation axis is provided on the side surface of a stir probe of a rotating tool. The pressure receiving surface includes a pressure receiving region which is always perpendicular to a rotation tangential direction in a cross section perpendicular to the rotation axis. In friction stir processing, the stir probe is caused to rotate in a rotation direction B in which the normal direction of the pressure receiving surface is positive. According to this kind of rotating tool, as it has no shoulder, a joint width does not increase even when a stirring region is deep, and also, a plastic flow in a rotation direction is generated by a pressure receiving surface, so that it is possible to reduce the proportion of the plastic flow in the rotation axis direction, and thus possible to suppress an occurrence of burr.Type: ApplicationFiled: February 27, 2020Publication date: November 19, 2020Applicants: Mitsubishi Electric Corporation, OSAKA UNIVERSITYInventors: Tetsuya AMASAKI, Hidetoshi FUJII, Keisuke MURASE, Seiiyu ISHIMOTO, Takuya IKEDA, Muneaki MUKUDA, Takushi TAKIZAWA, Naohiko HARADA, Shigenobu TOCHIYAMA
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Patent number: 7132775Abstract: The present invention provides a dynamoelectric stator and a method for the manufacture thereof enabling electrical insulation properties to be improved by forming slot-housed portions with a racetrack-shaped cross section to suppress damage to an electrically-insulating coating arising during mounting of a stator winding to a stator core. The construction is such that the slot-housed portions of the stator winding are formed with the racetrack-shaped cross section, and are housed inside slots so as to line up in single columns in a radial direction with a longitudinal direction of the cross section of the slot-housed portions aligned in a circumferential direction.Type: GrantFiled: December 26, 2002Date of Patent: November 7, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Atsushi Oohashi, Takushi Takizawa, Yukiyoshi Ohnishi
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Patent number: 7053515Abstract: The present invention provides a rotor for a rotary electric machine that suppresses the occurrence of winding disturbances in the process of winding a coil wire and has a coil field having a uniform outside diameter that is less likely to collapse. A coil field of a rotor coil is constructed by winding a coil wire having a circular cross section onto an outer circumference of a drum portion of a bobbin in multiple layers so as to make columns in each of the layers equal in number in an axial direction.Type: GrantFiled: October 22, 2002Date of Patent: May 30, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshio Nakanishi, Masashi Ono, Takushi Takizawa, Atsushi Oohashi, Katsunori Tanaka
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Patent number: 7049726Abstract: The invention provides a stator for a dynamo-electric machine capable of preventing deterioration of efficiency. In the stator for dynamo-electric machine of which rotor is disposed inside the stator, a stator core 11 comprises: an inside ring core 9 formed annularly by laminating plate-type magnetic members in which a plurality of teeth are provided on one side of a yoke portion, disposing coils 8 in slots each formed between the teeth, bending the plate-type magnetic members so that the coils 8 are located inside, and bringing two end faces into contact with each other; and an outside ring core 10, being made of magnetic members and formed cylindrical in shape, which is fitted on outside of the inside ring 9 and holds the inside ring core 9.Type: GrantFiled: March 4, 2003Date of Patent: May 23, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuuji Nakahara, Naohiro Oketani, Katsumi Adachi, Akira Morishita, Hiroshi Matsui, Tsuyoshi Takahashi, Takushi Takizawa, Yoshihito Asao
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Patent number: 6990724Abstract: An intermediate holding member is inserted between a second free end and a third free end from an inner circumferential side in a radial direction, a first radial restraining member presses against a free end at an innermost circumference from radially inside, and a second radial restraining member presses against a free end at an outermost circumference from radially outside. Next, a voltage is supplied between a torch and the members, an inert gas is supplied to the torch, and an arc discharge is generated between the torch and the free ends, welding the radially-adjacent free ends.Type: GrantFiled: October 10, 2002Date of Patent: January 31, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Syuuichi Tamura, Hiroyuki Akita, Takushi Takizawa, Atsushi Oohashi
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Publication number: 20050258704Abstract: The present invention provides a dynamoelectric stator and a method for the manufacture thereof enabling electrical insulation properties to be improved by forming slot-housed portions with a racetrack-shaped cross section to suppress damage to an electrically-insulating coating arising during mounting of a stator winding to a stator core. The construction is such that the slot-housed portions of the stator winding are formed with the racetrack-shaped cross section, and are housed inside slots so as to line up in single columns in a radial direction with a longitudinal direction of the cross section of the slot-housed portions aligned in a circumferential direction.Type: ApplicationFiled: December 26, 2002Publication date: November 24, 2005Inventors: Atsushi Oohashi, Takushi Takizawa, Yukiyoshi Ohnishi
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Patent number: 6960857Abstract: A stator winding is provided with three distributed winding phase portions each constructed by installing a conductor wire in every third slot. Slot-housed portions of the conductor wires are formed with a rectangular cross section and coil end portions are formed with a circular cross section.Type: GrantFiled: August 27, 2002Date of Patent: November 1, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Atsushi Oohashi, Yoshihito Asao, Takushi Takizawa, Yukiyoshi Ohnishi, Hiroshi Hosokawa
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Publication number: 20050218744Abstract: The present invention provides a rotor for a rotary electric machine that suppresses the occurrence of winding disturbances in the process of winding a coil wire and has a coil field having a uniform outside diameter that is less likely to collapse. A coil field of a rotor coil is constructed by winding a coil wire having a circular cross section onto an outer circumference of a drum portion of a bobbin in multiple layers so as to make columns in each of the layers equal in number in an axial direction.Type: ApplicationFiled: October 22, 2002Publication date: October 6, 2005Inventors: Toshio Nakanishi, Masashi Ono, Takushi Takizawa, Atsushi Oohashi, Katsunori Tanaka
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Patent number: 6896562Abstract: Joint terminal 21 has segue tubular hole 22, the entire surface of joint terminal 20 is provided with tinning, of which melting temperature is the carbonization temperature of an insulating coating of lead conductors 19d or less, lead conductors 19d are inserted in hole 22, and lead conductors 19d are welded to joint terminal 21 via tin 28 as an jointing ancillary agent, whereby a rotary electric machine and a method for producing the rotary electric machine, in which the jointed portion between the lead conductors and the joint terminal is not deteriorated by temperature, vibration and rust, the insulation is good, reliability of the jointed portion is excellent, are obtainable.Type: GrantFiled: July 1, 2002Date of Patent: May 24, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takushi Takizawa, Tomohiko Kuroda, Syuuichi Tamura, Hiroyuki Akita, Atsushi Oohashi
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Patent number: 6865796Abstract: Coil members are obtained by forming width-reduced portions in a wire material over a predetermined longitudinal range generally centered on cutting positions, then removing an insulation coating from the width-reduced portions, and thereafter cutting the wire material at the width-reduced portions. Coil segments are prepared by bending the coil members into a general U shape. Then the coil segments are inserted into the slots in a stator core, and a stator is obtained by welding together the free end portions of the projecting coil segments.Type: GrantFiled: November 14, 2000Date of Patent: March 15, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Atsushi Oohashi, Yoshihito Asao, Katsumi Adachi, Takushi Takizawa
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Publication number: 20040244184Abstract: The invention provides a stator for a dynamo-electric machine capable of preventing deterioration of efficiency. In the stator for dynamo-electric machine of which rotor is disposed inside the stator, a stator core 11 comprises: an inside ring core 9 formed annularly by laminating plate-type magnetic members in which a plurality of teeth are provided on one side of a yoke portion, disposing coils 8 in slots each formed between the teeth, bending the plate-type magnetic members so that the coils 8 are located inside, and bringing two end faces into contact with each other; and an outside ring core 10, being made of magnetic members and formed cylindrical in shape, which is fitted on outside of the inside ring 9 and holds the inside ring core 9.Type: ApplicationFiled: June 7, 2004Publication date: December 9, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yuuji Nakahara, Naohiro Oketani, Katsumi Adachi, Akira Morishita, Hiroshi Matsui, Tsuyoshi Takahashi, Takushi Takizawa, Yoshihito Asao
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Publication number: 20040207283Abstract: A stator winding is provided with three distributed winding phase portions each constructed by installing a conductor wire in every third slot. Slot-housed portions of the conductor wires are formed with a rectangular cross section and coil end portions are formed with a circular cross section.Type: ApplicationFiled: August 27, 2002Publication date: October 21, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Atsushi Oohashi, Yoshihito Asao, Takushi Takizawa, Yukiyoshi Ohnishi, Hiroshi Hosokawa
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Patent number: 6717317Abstract: In a connection portion of a stator winding, conductor wires extending outward from a slot pair separated by a predetermined number of slots are joined such that end portions of conductor wires extending outward from addresses of the slot pair separated by three or more addresses are joined together (a distant-address joint portion), and end portions of conductor wires in the slot pair separated by two or less addresses are joined together (a near-address joint portion). The distant-address joint portion is offset in a circumferential direction relative to the near-address joint portion.Type: GrantFiled: December 6, 2001Date of Patent: April 6, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroyuki Akita, Syuuichi Tamura, Takushi Takizawa, Mitsuharu Hashiba, Naohiro Oketani, Atsushi Oohashi, Yoshihito Asao, Katsumi Adachi
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Patent number: 6713928Abstract: An automotive alternator includes a rotor fixed to a shaft rotatably supported in a case, and a stator provided with a cylindrical stator core supported in the case so as to envelop the rotor, slots extending axially being formed in the stator core so as to line up in a circumferential direction at a ratio of two per phase per pole, and a stator winding constructed by installing a conductor wire coated with an electrical insulator in the stator core, a relationship between a radial dimension (d) of the conductor wire coated with the electrical insulator and a circumferential width dimension (L) of the slots being 2d<L.Type: GrantFiled: November 27, 2001Date of Patent: March 30, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takushi Takizawa, Atsushi Oohashi, Yoshihito Asao
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Patent number: 6707211Abstract: A stator winding is formed by inserting two conductor segments each from a first end surface of a stator core into a pair of slots separated by six slots and joining together end portions of the conductor segments extending outward from a second end surface of the stator core, slot-housed portions of the conductor segments being formed with a rectangular cross section and linking portions constituting coil ends being formed with a circular cross section.Type: GrantFiled: April 10, 2002Date of Patent: March 16, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Atsushi Oohashi, Yoshihiro Harada, Takushi Takizawa, Kensaku Kuroki, Hirotatsu Kanai, Yoshihito Asao, Katsumi Adachi
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Patent number: 6664703Abstract: A stator for a rotary machine includes a rotor 7 and a stator 8 having a stator iron core 15 disposed oppositely around the outer circumference of the rotor 7 and a stator coil 16 fitted around the iron core 15, wherein the iron core 15 has a laminated iron core 150 with plural axially extending slots 15a formed circumferentially at predetermined pitches, an insulating resin 100 is coated on an axial end face 15f of the iron core 15 and an inner wall face of a slot 15a in the laminated iron core 150 to provide insulation between the iron core 15 and the stator coil 16, and the iron core is cylindrically shaped by bringing both circumferential end portions 15g of the laminated iron core 150 into contact to bend the laminated iron core 150 so that an opening face 15b of the slot 15a is directed inside.Type: GrantFiled: July 17, 2001Date of Patent: December 16, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Naohiro Oketani, Takushi Takizawa, Hiroki Katayama, Atsushi Oohashi, Yoshihito Asao
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Publication number: 20030189387Abstract: The invention provides a stator for a dynamo-electric machine capable of preventing deterioration of efficiency. In the stator for dynamo-electric machine of which rotor is disposed inside the stator, a stator core 11 comprises: an inside ring core 9 formed annularly by laminating plate-type magnetic members in which a plurality of teeth are provided on one side of a yoke portion, disposing coils 8 in slots each formed between the teeth, bending the plate-type magnetic members so that the coils 8 are located inside, and bringing two end faces into contact with each other; and an outside ring core 10, being made of magnetic members and formed cylindrical in shape, which is fitted on outside of the inside ring 9 and holds the inside ring core 9.Type: ApplicationFiled: March 4, 2003Publication date: October 9, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yuuji Nakahara, Naohiro Oketani, Katsumi Adachi, Akira Morishita, Hiroshi Matsui, Tsuyoshi Takahashi, Takushi Takizawa, Yoshihito Asao
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Publication number: 20030137207Abstract: An intermediate holding member is inserted between a second free end and a third free end from an inner circumferential side in a radial direction, a first radial restraining member presses against a free end at an innermost circumference from radially inside, and a second radial restraining member presses against a free end at an outermost circumference from radially outside. Next, a voltage is supplied between a torch and the members, an inert gas is supplied to the torch, and an arc discharge is generated between the torch and the free ends, welding the radially-adjacent free ends.Type: ApplicationFiled: October 10, 2002Publication date: July 24, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Syuuichi Tamura, Hiroyuki Akita, Takushi Takizawa, Atsushi Oohashi
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Publication number: 20030129856Abstract: Joint terminal 21 has segue tubular hole 22, the entire surface of joint terminal 20 is provided with tinning, of which melting temperature is the carbonization temperature of an insulating coating of lead conductors 19d or less, lead conductors 19d are inserted in hole 22, and lead conductors 19d are welded to joint terminal 21 via tin 28 as an jointing ancillary agent, whereby a rotary electric machine and a method for producing the rotary electric machine, in which the jointed portion between the lead conductors and the joint terminal is not deteriorated by temperature, vibration and rust, the insulation is good, reliability of the jointed portion is excellent, are obtainable.Type: ApplicationFiled: July 1, 2002Publication date: July 10, 2003Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Takushi Takizawa, Tomohiko Kuroda, Syuuichi Tamura, Hiroyuki Akita, Atsushi Oohashi
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Publication number: 20030015932Abstract: A stator winding is formed by inserting two conductor segments each from a first end surface of a stator core into a pair of slots separated by six slots and joining together end portions of the conductor segments extending outward from a second end surface of the stator core, slot-housed portions of the conductor segments being formed with a rectangular cross section and linking portions constituting coil ends being formed with a circular cross section.Type: ApplicationFiled: April 10, 2002Publication date: January 23, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Atsushi Oohashi, Yoshihiro Harada, Takushi Takizawa, Kensaku Kuroki, Hirotatsu Kanai, Yoshihito Asao, Katsumi Adachi