Patents by Inventor Kyouhei Yamamoto
Kyouhei Yamamoto 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: 6844649Abstract: An armature includes a plurality of equalizing connectors for permanently electrically connecting pairs of commutator segments that should have the same electric potential, so that each of the pairs of the commutator segments that should have the same electric potential has a substantially equal electrical potential. In one embodiment, at least one pair of adjacent coil portions share a common slot.Type: GrantFiled: November 14, 2001Date of Patent: January 18, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Kyouhei Yamamoto, Akihiro Daikoku, Akihiko Imagi, Yoshio Yoshikuwa, Mitsuyuki Tsumura
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Publication number: 20040202555Abstract: An electro-hydraulic power steering apparatus in which a control device, a motor and a pump are integrated. The apparatus includes a first housing, a second housing, a control device surrounded by the first and second housings, a motor disposed on a side of the first housing and a pump disposed on a side of the second housing. The motor includes a rotor, a stator and a frame. The rotor has a first bearing supported by the first housing. The frame includes an inner circumferential face into which a stator core is press fitted and receives a second bearing of the rotor. The frame is secured to the first housing by a first clamp screw. The first housing and the second housing are secured by a second clamp screw. The first and second clamp screws are tightened from the hand of the frame.Type: ApplicationFiled: March 2, 2004Publication date: October 14, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Kiyohide Okamoto, Yuusuke Matsui, Kyouhei Yamamoto, Shuji Isono, Hideki Megata, Keiichi Fukazawa, Katsumi Ohata, Kengo Fujimoto
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Publication number: 20040201302Abstract: A method for manufacturing an armature including securing a core to the shaft having a plurality of slots extending in the axial direction formed on the outer circumferential surface thereof, forming a coil composed of a plurality of coil portions simultaneously winding wires a plurality of turns around a pair of slots separated by a predetermined number of slots and offsetting each of the coil portions one slot at a time in the circumferential direction of the core, securing a commutator to the shaft having a plurality of segments, adjacent coil portions having a slot along one side thereof, and electrically connecting segments which should have the same electric potential by means of equalizing connectors so that each pairs of the segments that should have the same electric potential has a substantially equal electrical potential.Type: ApplicationFiled: April 29, 2004Publication date: October 14, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Kyouhei Yamamoto, Akihiro Daikoku, Akihiko Imagi, Yoshio Yoshikuwa, Mitsuyuki Tsumura
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Patent number: 6787963Abstract: An brush assembly is provided in which electric power losses in brushes 32 are reduced, thereby suppressing an abnormal or excessive rise in temperature of the brushes. A tip end of a lead wire 33 inserted into a corresponding brush 32 in a direction of pressing upon press molding thereof is embedded in the brush in such a manner that it extends over two thirds or more of the length in the pressing direction of the brush 32.Type: GrantFiled: November 27, 2001Date of Patent: September 7, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Keiichi Fukazawa, Kei Yonemori, Yusuke Matsui, Kyouhei Yamamoto
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Patent number: 6774525Abstract: The present invention provides a dynamo-electric machine that prevents the lead portions of the coil portions disposed at places, at which mechanical balance is provided, from intersecting each other, that enhances the workability in manufacturing the wiring by wiring a conductor, and that suppresses the defective insulation of the winding. This dynamo-electric machine for use in an electric power steering system has a yoke, n (incidentally, “n” is a common divisor of the number of the magnetic poles and the number of the slots and equal to or more than 2) of the coil portions are parallel-connected between the segments. Moreover, the coil portions are disposed in such a manner as to be symmetrical with respect to a mechanical angle of 360 degrees. Lead parts of the coil portions other than one of the coil portions, which is nearest in a circumferential direction to each of the segments, are drawn therefrom in the same circumferential direction.Type: GrantFiled: August 17, 2001Date of Patent: August 10, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Akihiro Daikoku, Kyouhei Yamamoto, Kei Yonemori
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Publication number: 20040134708Abstract: An electro-hydraulic power steering apparatus includes: a motor having a rotational shaft and provided with a bearing for rotatably bearing the rotational shaft; a hydraulic pump disposed at one end of the rotational shaft of the motor and driven by the motor; a first elastic body for supporting the bearing; and a second elastic body for pressing the bearing in an axial direction.Type: ApplicationFiled: December 24, 2003Publication date: July 15, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Keiichi Fukazawa, Yuusuke Matsui, Kyouhei Yamamoto, Katsumi Ohata, Kengo Fujimoto
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Patent number: 6731040Abstract: A brush motor for an electric power steering system comprises a four-pole field portion 3, an armature 4 having windings 9 wound around a core 5 with 22 slots 8 to constitute a lap winding, hooks 12 which are formed on one ends of 22 commutator segments 10 respectively and on which the windings 9 are hooked, and a cylindrical commutator 7 constructed by molding integrally the commutator segments 10 with a resin, and four brushes 18 which contact slidably to outer peripheral surfaces of the commutator segments 10, wherein, when the commutator 7 to which a sliding contact portion of the brush 18 contacts is sectioned perpendicularly to an axial direction, a relationship of 0.18≦(A×N)/(D×D)≦0.23 is satisfied, where A is a sectional area of one commutator segment, N is a number of the commutator segments, and D is a diameter of outer peripheral surfaces of the commutator segments.Type: GrantFiled: July 1, 2003Date of Patent: May 4, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Masayoshi Yamamoto, Osamu Waku, Kyouhei Yamamoto
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Patent number: 6703751Abstract: The present invention provides a dynamo-electric machine that suppresses vibrations caused by imbalance due to electromagnetic forces and that also suppresses imbalance in magnetic attraction forces generated owing to the difference in the number of coil portions among electric circuit portions. This dynamo-electric machine comprises an armature having a winding consisting of a plurality of coil portions each formed by lap-winding a conductor between a corresponding pair of slots formed in an outer circumferential surface portion of a core fixed to a shaft in such a way as to extend in an axial direction thereof, a commutator fixed to an end portion of the shaft and having a plurality of segments to which both end sections of said coil portions are electrically connected, brushes made to respectively abut against the surfaces of the segments of the commutator, and equalizers for connecting said segments, which are to be at equal electric potential, to each other.Type: GrantFiled: August 17, 2001Date of Patent: March 9, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Akihiro Daikoku, Kyouhei Yamamoto, Kei Yonemori
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Publication number: 20040027027Abstract: The method for resolving the stator having a coil disposed in the slots provided around an inner circumferential face of a cylindrical iron core and having an opening portion includes a step of enlarging the opening portion of the slot, and a step of extracting the coil from the slot.Type: ApplicationFiled: August 7, 2003Publication date: February 12, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yoshihito Asao, Kyouhei Yamamoto
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Publication number: 20030080647Abstract: A surface of a commutator 5 is rubbed by a shakedown brush 21 other than ordinary brushes 11 to produce a carbon coat, whereby a shakedown process can be reduced or abolished.Type: ApplicationFiled: March 7, 2002Publication date: May 1, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Hisato Sakaguchi, Kyouhei Yamamoto
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Publication number: 20020167244Abstract: An brush assembly is provided in which electric power losses in brushes 32 are reduced, thereby suppressing an abnormal or excessive rise in temperature of the brushes. A tip end of a lead wire 33 inserted into a corresponding brush 32 in a direction of pressing upon press molding thereof is embedded in the brush in such a manner that it extends over two thirds or more of the length in the pressing direction of the brush 32.Type: ApplicationFiled: November 27, 2001Publication date: November 14, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Keiichi Fukazawa, Kei Yonemori, Yusuke Matsui, Kyouhei Yamamoto
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Patent number: 6462454Abstract: A rotary electric machine of the present invention includes a yoke, a multi-polar magnetic field portion composed of 4 poles fixed to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature fixed to the shaft having a winding composed of a conductor wire wound by double wave winding into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of segments fixed to an end portion of the shaft, and a plurality of brushes contacting the surface of the commutator. With this arrangement, there can be obtained a rotary electric machine capable of reducing operation noise.Type: GrantFiled: December 1, 2000Date of Patent: October 8, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kyouhei Yamamoto, Toshinori Tanaka
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Publication number: 20020113514Abstract: The present invention provides a dynamo-electric machine that suppresses vibrations caused by imbalance due to electromagnetic forces and that also suppresses imbalance in magnetic attraction forces generated owing to the difference in the number of coil portions among electric circuit portions. This dynamo-electric machine comprises an armature having a winding consisting of a plurality of coil portions each formed by lap-winding a conductor between a corresponding pair of slots formed in an outer circumferential surface portion of a core fixed to a shaft in such a way as to extend in an axial direction thereof, a commutator fixed to an end portion of the shaft and having a plurality of segments to which both end sections of said coil portions are electrically connected, brushes made to respectively abut against the surfaces of the segments of the commutator, and equalizers for connecting said segments, which are to be at equal electric potential, to each other.Type: ApplicationFiled: August 17, 2001Publication date: August 22, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Akihiro Daikoku, Kyouhei Yamamoto, Kei Yonemori
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Publication number: 20020079774Abstract: The present invention provides a dynamo-electric machine that prevents the lead portions of the coil portions disposed at places, at which mechanical balance is provided, from intersecting each other, that enhances the workability in manufacturing the wiring by wiring a conductor, and that suppresses the defective insulation of the winding. This dynamo-electric machine for use in an electric power steering system has a yoke, n (incidentally, “n” is a common divisor of the number of the magnetic poles and the number of the slots and equal to or more than 2) of the coil portions are parallel-connected between the segments. Moreover, the coil portions are disposed in such a manner as to be symmetrical with respect to a mechanical angle of 360 degrees. Lead parts of the coil portions other than one of the coil portions, which is nearest in a circumferential direction to each of the segments, are drawn therefrom in the same circumferential direction.Type: ApplicationFiled: August 17, 2001Publication date: June 27, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Akihiro Daikoku, Kyouhei Yamamoto, Kei Yonemori
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Patent number: 6388355Abstract: A motor for an electric power steering assembly includes a yoke, a multipolar magnetic field portion composed of at least four poles secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding constructed by winding wiring into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of segments secured to an end portion of the shaft; and a plurality of brushes contacting the surface of the commutator.Type: GrantFiled: July 2, 2001Date of Patent: May 14, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Ryuichi Ikeda, Shigekazu Sakabe, Akihiro Daikoku, Akihiko Imagi, Yoshio Yoshikuwa, Kyouhei Yamamoto
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Patent number: 6388354Abstract: A motor for an electric power steering assembly includes a yoke, a multi-polar magnetic field portion composed of at least four poles secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding constructed by winding wiring into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator including a plurality of segments secured to an end portion of the shaft; and a plurality of brushes contacting the surface of the commutator.Type: GrantFiled: May 18, 1999Date of Patent: May 14, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Ryuichi Ikeda, Shigekazu Sakabe, Akihiro Daikoku, Akihiko Imagi, Yoshio Yoshikuwa, Kyouhei Yamamoto
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Publication number: 20020047452Abstract: An armature comprises: a shaft; a core secured to the shaft having a plurality of slots extending in the axial direction formed on the outer circumferential surface thereof; a coil composed of a plurality of coil portions formed by winding wires a plurality of turns around a pair of slots separated by a predetermined number of slots and offsetting each of the coil portions one slot at a time in the circumferential direction of the core; and a commutator secured to the shaft having a plurality of segments; adjacent coil portions sharing a slot along one side thereof, wherein segments which should have the same electric potential are electrically connected by means of equalizing connectors.Type: ApplicationFiled: November 14, 2001Publication date: April 25, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Kyouhei Yamamoto, Akihiro Daikoku, Akihiko Imagi, Yoshio Yoshikuwa, Mitsuyuki Tsumura
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Publication number: 20020008430Abstract: A motor for an electric power steering assembly comprises a yoke, a multi-polar magnetic field portion composed of at least four poles secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding constructed by winding wiring into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of segments secured to an end portion of the shaft; and a plurality of brushes contacting the surface of the commutator.Type: ApplicationFiled: July 2, 2001Publication date: January 24, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Toshinori Tanaka, Ryuichi Ikeda, Shigekazu Sakabe, Akihiro Daikoku, Akihiko Imagi, Yoshio Yoshikuwa, Kyouhei Yamamoto
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Patent number: 6329735Abstract: A commutator motor includes a cylindrical yoke, magnets disposed opposite each other inside the yoke, a shaft disposed on the central axis of the yoke so as to rotate freely, an armature secured to the shaft, a commutator secured to one end of the shaft, brushes placed in contact with the surface of the commutator by the elastic force of springs, a brush holder for holding the brushes, and a housing mounted to the yoke, the brush holder being supported on the housing by an elastic body, and an elastic member for positioning the central axis of the brush holder so as to be aligned with the central axis of the shaft being disposed between the housing and the brush holder.Type: GrantFiled: November 15, 1999Date of Patent: December 11, 2001Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshinori Tanaka, Kazuhisa Takashima, Kyouhei Yamamoto
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Publication number: 20010038252Abstract: A rotary electric machine of the present invention includes a yoke, a multi-polar magnetic field portion composed of 4 poles fixed to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature fixed to the shaft having a winding composed of a conductor wire wound by double wave winding into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of segments fixed to an end portion of the shaft, and a plurality of brushes contacting the surface of the commutator. With this arrangement, there can be obtained a rotary electric machine capable of reducing operation noise.Type: ApplicationFiled: December 1, 2000Publication date: November 8, 2001Inventors: Kyouhei Yamamoto, Toshinori Tanaka