Patents by Inventor Masafumi Sakuma
Masafumi Sakuma 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: 20170093237Abstract: A three-phase rotating electrical machine includes a stator including a stator core provided with a plurality of teeth and a plurality of slots, and winding, the three-phase rotating electrical machine including a rotor including a rotor core and a north magnetic pole and a south magnetic pole, the three-phase rotating electrical machine including a fractional slot configuration, the rotor core including a north magnetic pole acting portion, a south magnetic pole acting portion, a magnetic pole boundary dividing the north magnetic pole acting portion and the south magnetic pole acting portion in the circumferential direction, and a magnetic resistance portion, the magnetic resistance portion restricting the magnetic flux from passing through.Type: ApplicationFiled: September 29, 2016Publication date: March 30, 2017Applicant: Aisin Seiki Kabushiki KaishaInventors: Teppei TSUDA, Masafumi SAKUMA
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Publication number: 20160285336Abstract: A rotary electric machine includes a stator including a stator winding and a rotor movable relative to the stator in a first direction and arranged to face the stator in a second direction, the rotor including plural pairs of rotor poles at a rotor core, each pair of the plural pairs of rotor poles including different polarities from each other, the stator including a fractional slot configuration where the number of slots per pole per phase is a non-integer, the stator winding being wound by a fractional slot winding, one of a stator core and the rotor core including a base portion and either a single position portion or plural position portions which is connected to the base portion in a third direction and which is displaced relative to the base portion in the first direction, the third direction being orthogonal to the first direction and the second direction.Type: ApplicationFiled: February 25, 2016Publication date: September 29, 2016Applicant: Aisin Seiki Kabushiki KaishaInventors: Masafumi SAKUMA, Teppei TSUDA
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Patent number: 9325211Abstract: A wave winding coil for a rotary electrical machine includes a coil conductor including coil side portions and coil end portions, the coil conductor being wound to include a wave winding configuration, a relational expression expressing a total number of the coil side portions included in a phase coil is expressed by a mathematical expression 1 m×k=n×q×2p, and m refers to the number of the phase unit coils that are parallelly connected to each other, k refers to the number of the coil side portions that are serially connected to each other, q refers to the number of serially-connected-conductors per magnetic pole, the serially-connected-conductor belongs to one of the kinds of the coil side portions, 2p refers to the number of the magnetic pole, m refers to a common divisor between q×2p and n.Type: GrantFiled: December 17, 2012Date of Patent: April 26, 2016Assignee: AISIN SEIKI KABUSHIKI KAISHAInventors: Masafumi Sakuma, Tomohiro Fukushima, Shuhei Yamashita
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Patent number: 8578904Abstract: An engine starting method in a parallel-type hybrid vehicle comprises a motor reverse rotation driving step of applying reverse rotation current to drivingly rotate a motor output shaft in a reverse rotation direction of an engine output shaft whereby an elastic member in a damper is elastically deformed to store an urging force that urges the motor output shaft in a normal rotation direction; an urged normal rotation step of stopping the electrification to release the urging force having been stored at the motor reverse rotation driving step whereby the motor output shaft is rotated in the normal rotation direction; a motor normal rotation driving step of applying normal rotation current to drivingly rotate the motor output shaft in the normal rotation direction; and an engine start igniting step of igniting an engine with the engine output shaft being rotated by the rotation at the motor normal rotation driving step.Type: GrantFiled: February 14, 2011Date of Patent: November 12, 2013Assignee: Aisin Seiki Kabushiki KaishaInventor: Masafumi Sakuma
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Patent number: 8541917Abstract: A stator assembly structure of a rotary electrical machine for assembling a stator on a case includes the stator including a stator holder and a stator core, the stator holder including a flange portion that includes a plurality of positioning bores arranged at intervals and a fixing portion fixing the stator to the case, the case including a positioning pin having an outer diameter smaller than a diameter of each of the positioning bores and being engageable with each of the positioning bores, the case further including a fixing seat, and each of the positioning bores including at least three bending portions that extend from a peripheral edge of the positioning bore towards a radially inward side, each of the bending portions being formed to be bent at a portion in a length direction from the peripheral edge towards the radially inward side relative to the flange portion.Type: GrantFiled: February 25, 2011Date of Patent: September 24, 2013Assignee: Aisin Seiki Kabushiki KaishaInventors: Masafumi Sakuma, Tomohiro Sato
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Patent number: 8471420Abstract: A rotating electrical machine includes a stator including a coil, a case accommodating the stator and oil, an external connection terminal block arranged at an outer circumferential portion of the case and connecting the coil to an external device, a terminal box arranged at the outer circumferential portion and including a case connecting hole and an external connecting hole respectively in connection with an inner portion of the case and an external atmosphere, the terminal box accommodating the external connection terminal block, a coil wiring member connecting an end portion of the coil to the external connection terminal block by penetrating through the case connecting hole, an external device wiring member connecting the external connection terminal block to the external device by penetrating through the external connecting hole, and a case connecting hole sealing member fixed to the coil wiring member to seal the case connecting hole by fitting thereinto.Type: GrantFiled: November 17, 2010Date of Patent: June 25, 2013Assignee: Aisin Seiki Kabushiki KaishaInventors: Shigetaka Isogai, Masafumi Sakuma
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Patent number: 8358041Abstract: An electric motor having a wire connection structure includes a stator including a stator coil, a rotor, a motor housing accommodating the stator and the rotor and having a hole, a cable retaining portion formed on the motor housing for retaining end portions of feed cables, a fixing portion formed on the stator, first terminals connected to the stator coil and arranged on the fixing portion in an orientation different from an orientation of the end portions, second terminals each projecting from each of the end portions to face the corresponding first terminal after being inserted into the hole, at least one of the second terminals being bent, and screw members engaged with the fixing portion after being inserted into the corresponding first and second terminals, each of the screw members jointly fastening the first and second terminals to the fixing portion to electrically connect the first and second terminals.Type: GrantFiled: June 18, 2010Date of Patent: January 22, 2013Assignee: Aisin Seiki Kabushiki KaishaInventors: Shigetaka Isogai, Masafumi Sakuma, Ryoji Mizutani
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Patent number: 8319382Abstract: An electric motor includes a stator having a stator coil, a rotor, a motor housing having a through hole, a fixing portion extending from the stator within the motor housing towards the through hole, a load receiving member inserted into the through hole and having a through bore, a conductive member connected to an electric power supply wire member and arranged at a first end portion of the load receiving member, a first terminal connected to the stator coil and provided between a second end portion of the load receiving member and the fixing portion, and a screw bolt fixing the conductive member, the load receiving member and the first terminal on the fixing portion, so that the load receiving member is press-fixedly sandwiched by the conductive member and the first terminal so that an electric power flows therebetween via the load receiving member.Type: GrantFiled: June 18, 2010Date of Patent: November 27, 2012Assignee: Aisin Seiki Kabushiki KaishaInventors: Shigetaka Isogai, Masafumi Sakuma, Ryoji Mizutani
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Publication number: 20120234282Abstract: An engine starting method in a parallel-type hybrid vehicle comprises a motor reverse rotation driving step of applying reverse rotation current to drivingly rotate a motor output shaft in a reverse rotation direction of an engine output shaft whereby an elastic member in a damper is elastically deformed to store an urging force that urges the motor output shaft in a normal rotation direction; an urged normal rotation step of stopping the electrification to release the urging force having been stored at the motor reverse rotation driving step whereby the motor output shaft is rotated in the normal rotation direction; a motor normal rotation driving step of applying normal rotation current to drivingly rotate the motor output shaft in the normal rotation direction; and an engine start igniting step of igniting an engine with the engine output shaft being rotated by the rotation at the motor normal rotation driving step.Type: ApplicationFiled: February 14, 2011Publication date: September 20, 2012Applicant: AISIN SEIKI KABUSHIKI KAISHAInventor: Masafumi Sakuma
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Patent number: 8258670Abstract: A motor includes a stator, a case and a supporting portion. The stator formed by laminating plural disc plates includes a yoke portion having a plurality of first and second portions alternately formed in a circumferential direction of the stator, and plural tooth portions respectively radially protruding from an inner circumferential surface the yoke portion at the second portion of the yoke portion towards an axial center of the stator. The case provided at an outer circumference of the stator includes a first communicating passage extending in an axial direction of the stator to be in communication with both axial ends of the stator and defined by an inner circumferential surface of the case. The supporting portion protrudes from an inner circumferential surface of the first communicating passage towards the stator and contacts an outer surface of the stator at one of the first portions of the stator.Type: GrantFiled: October 31, 2008Date of Patent: September 4, 2012Assignee: Aisin Seiki Kabushiki KaishaInventors: Masafumi Sakuma, Tomohiro Fukushima, Masayuki Nishimura
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Patent number: 8195348Abstract: Front left and right wheel units are driven by an engine and a motor generator. Rear left and right wheel units are independently driven by in-wheel motor type motor generators. The motor generator and the motor generator are configured to have different rated outputs, respectively, and be subjected to different speed reduction ratios, respectively, between the motor generators and their respectively associated drive wheel units, and thus have characteristics, respectively, in efficiency with respect to torque and vehicular speed, that exhibit high efficiency in mutually different output ranges, respectively. When a mileage oriented mode is selected as a traveling mode, an ECU determines how a drive torque should be allocated between the motor generators, as based on the motors' required drive torque and vehicular speed and on each motor generator's characteristic in efficiency, to maximize the motor generators' total efficiency.Type: GrantFiled: May 18, 2007Date of Patent: June 5, 2012Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki KaishaInventors: Ryoji Mizutani, Michitaka Tsuchida, Yasuaki Tahara, Tomohiro Fukushima, Masafumi Sakuma
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Publication number: 20110215666Abstract: A stator assembly structure of a rotary electrical machine for assembling a stator on a case includes the stator including a stator holder and a stator core, the stator holder including a flange portion that includes a plurality of positioning bores arranged at intervals and a fixing portion fixing the stator to the case, the case including a positioning pin having an outer diameter smaller than a diameter of each of the positioning bores and being engageable with each of the positioning bores, the case further including a fixing seat, and each of the positioning bores including at least three bending portions that extend from a peripheral edge of the positioning bore towards a radially inward side, each of the bending portions being formed to be bent at a portion in a length direction from the peripheral edge towards the radially inward side relative to the flange portion.Type: ApplicationFiled: February 25, 2011Publication date: September 8, 2011Applicant: Aisin Seiki Kabushiki KaishaInventors: Masafumi Sakuma, Tomohiro Sato
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Patent number: 7994680Abstract: A motor includes an output shaft rotatably provided, a rotor fixed to the output shaft and rotatable with the output shaft, a stator formed by a lamination of plurality of electrical steel sheets made by a magnetic material, the electrical steel sheets being punched by means of a press working, a coil wound at the stator, and a case accommodating the stator and the rotor and including a holder for holding the stator. The electrical steel sheets are arranged at one end of the stator in a lamination direction thereof and at the other end of the stator in the lamination direction thereof respectively. The electrical steel sheets include surfaces each at which a shear droop is formed. The surfaces of the electrical steel sheets face each other.Type: GrantFiled: January 28, 2009Date of Patent: August 9, 2011Assignee: Aisin Seiki Kabushiki KaishaInventor: Masafumi Sakuma
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Patent number: 7958960Abstract: Right front wheel units (FL, FR) are driven independently by motor generators (MGL, MGR). A power control unit (1) is provided common to the motor generators (MGL, MGR) and integrally controls driving them. Each motor generator (MGL, MGR) and the power control unit (1) are selectively connected by switch circuits (SWL, SWR). The switch circuits (SWL, SWR) are switched by an ECU (3), as appropriate, in accordance with how the vehicle (100) is currently traveling (i.e., a driving force that the vehicle is required to output, and a direction in which the vehicle is traveling). In other words, the vehicle (100) can selectively implement traveling with the left and right front wheel units (FL, FR) both serving as driving wheel units, and traveling with only one of the left and right front wheel units (FL, FR) serving as a driving wheel unit, depending on how the vehicle is currently traveling.Type: GrantFiled: November 29, 2006Date of Patent: June 14, 2011Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki KaishaInventors: Ryoji Mizutani, Michitaka Tsuchida, Tomohiro Fukushima, Masafumi Sakuma
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Publication number: 20110115316Abstract: A rotating electrical machine includes a stator including a coil, a case accommodating the stator and oil, an external connection terminal block arranged at an outer circumferential portion of the case and connecting the coil to an external device, a terminal box arranged at the outer circumferential portion and including a case connecting hole and an external connecting hole respectively in connection with an inner portion of the case and an external atmosphere, the terminal box accommodating the external connection terminal block, a coil wiring member connecting an end portion of the coil to the external connection terminal block by penetrating through the case connecting hole, an external device wiring member connecting the external connection terminal block to the external device by penetrating through the external connecting hole, and a case connecting hole sealing member fixed to the coil wiring member to seal the case connecting hole by fitting thereinto.Type: ApplicationFiled: November 17, 2010Publication date: May 19, 2011Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Shigetaka ISOGAI, Masafumi Sakuma
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Patent number: 7938212Abstract: An in-wheel motor system includes a knuckle supporting a hub to be rotatable and including a tank portion in which a refrigerant is accumulated, a housing fixedly attached to the knuckle, a motor incorporated within the housing and driving the hub to rotate, and a pump incorporated within the housing and pumping the refrigerant accumulated within the tank portion to the motor by means of a rotational power of the motor to refrigerate the motor.Type: GrantFiled: March 3, 2009Date of Patent: May 10, 2011Assignee: Aisin Seiki Kabushiki KaishaInventors: Masafumi Sakuma, Shigetaka Isogai
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Patent number: 7928627Abstract: A laminated core (10) and a method for manufacturing the same formed with multiple continuous segment core pieces (13) wound in a spiral form by bending connecting portions (12) mutually connecting the segment core pieces (13), the connecting portions (12) being formed in an outer peripheral area (11), while the connecting portions (12) of vertically adjacent layers being displaced in a circumferential direction with inner edges or outer edges of the segment core pieces (13) fitted, the laminated core comprising: a concave cutout (21) provided in a radial exterior of each connecting portion (12) to dispose a radially expanded portion (20) within an outer circle of the laminated core (10), the radially expanded portion (20) being formed with each connecting portion (12) expanding radially outward at the time of bending each connecting portion (12); an interior cutout (22) provided in a radial interior of each connecting portion (12) to define a bending position of each connecting portion (12); and a receptacleType: GrantFiled: July 6, 2010Date of Patent: April 19, 2011Assignee: Mitsui High-Tec, Inc.Inventors: Akira Nagai, Iwao Myojin, Akinori Hoshino, Masafumi Sakuma, Hiroyuki Yamamoto, Haruji Suzuki
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Publication number: 20100320853Abstract: An electric motor includes a stator having a stator coil, a rotor, a motor housing having a through hole, a fixing portion extending from the stator within the motor housing towards the through hole, a load receiving member inserted into the through hole and having a through bore, a conductive member connected to an electric power supply wire member and arranged at a first end portion of the load receiving member, a first terminal connected to the stator coil and provided between a second end portion of the load receiving member and the fixing portion, and a screw bolt fixing the conductive member, the load receiving member and the first terminal on the fixing portion, so that the load receiving member is press-fixedly sandwiched by the conductive member and the first terminal so that an electric power flows therebetween via the load receiving member.Type: ApplicationFiled: June 18, 2010Publication date: December 23, 2010Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Shigetaka Isogai, Masafumi Sakuma, Ryoji Mizutani
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Publication number: 20100320852Abstract: An electric motor having a wire connection structure includes a stator including a stator coil, a rotor, a motor housing accommodating the stator and the rotor and having a hole, a cable retaining portion formed on the motor housing for retaining end portions of feed cables, a fixing portion formed on the stator, first terminals connected to the stator coil and arranged on the fixing portion in an orientation different from an orientation of the end portions, second terminals each projecting from each of the end portions to face the corresponding first terminal after being inserted into the hole, at least one of the second terminals being bent, and screw members engaged with the fixing portion after being inserted into the corresponding first and second terminals, each of the screw members jointly fastening the first and second terminals to the fixing portion to electrically connect the first and second terminals.Type: ApplicationFiled: June 18, 2010Publication date: December 23, 2010Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Shigetaka Isogai, Masafumi Sakuma, Ryoji Mizutani
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Publication number: 20100270888Abstract: A laminated core (10) and a method for manufacturing the same formed with multiple continuous segment core pieces (13) wound in a spiral form by bending connecting portions (12) mutually connecting the segment core pieces (13), the connecting portions (12) being formed in an outer peripheral area (11), while the connecting portions (12) of vertically adjacent layers being displaced in a circumferential direction with inner edges or outer edges of the segment core pieces (13) fitted, the laminated core comprising: a concave cutout (21) provided in a radial exterior of each connecting portion (12) to dispose a radially expanded portion (20) within an outer circle of the laminated core (10), the radially expanded portion (20) being formed with each connecting portion (12) expanding radially outward at the time of bending each connecting portion (12); an interior cutout (22) provided in a radial interior of each connecting portion (12) to define a bending position of each connecting portion (12); and a receptacleType: ApplicationFiled: July 6, 2010Publication date: October 28, 2010Applicant: MITSUI HIGH-TEC, INC.Inventors: Akira Nagai, Iwao Myojin, Akinori Hoshino, Masafumi Sakuma, Hiroyuki Yamamoto, Haruji Suzuki