Patents by Inventor Norihisa IWASAKI
Norihisa IWASAKI 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).
-
Patent number: 11749553Abstract: A first vacuum motor includes a first pivoting shaft member, a bearing that rotatably supports the first pivoting shaft member, a disk disposed to be rotatable together with the first pivoting shaft member and having slits, a first bracket that is made of a non-magnetic material and supports the bearing, a recess formed in the first bracket to be dented in the axial direction, and a sensor unit disposed to face the disk in the axial direction via a thin wall formed by the recess. By the thin wall, the space where the sensor unit is disposed under the atmospheric pressure is isolated from the space where the disk is disposed under a reduced pressure lower than the atmospheric pressure.Type: GrantFiled: November 6, 2020Date of Patent: September 5, 2023Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Masanobu Harada, Hiromitsu Akae, Norihisa Iwasaki
-
Patent number: 11251670Abstract: An axial air-gap rotary electric machine includes a stator, a coil, and a bobbin. The bobbin includes a tube and a flange. The coil is wound on the outer periphery of the tube portion with regular winding. A number of turns of each of a plurality of layers wound around an external side of a last layer in contact with the flange is at least one less than a number of turns of each of a plurality of layers wound around an adjacent internal side of the last layer.Type: GrantFiled: April 23, 2014Date of Patent: February 15, 2022Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hirooki Tokoi, Daisuke Kitajima, Tomonori Kawagoe, Katsuyuki Yamazaki, Toru Sakai, Shuuichi Takahashi, Toshifumi Suzuki, Norihisa Iwasaki, Ryousou Masaki, Yuji Enomoto
-
Patent number: 11165312Abstract: This invention reduces the shaft voltage of an axial-air-gap dynamo-electric machine while ensuring high output and high efficiency. Said axial-air-gap dynamo-electric machine comprises the following: a stator comprising a plurality of stator cores, each of which comprises a core and a coil, arranged in a circle around a shaft; a housing, the inside surface of which faces the stator radially; and at least one rotor, the surface of which faces the surface of the stator with a prescribed air gap interposed therebetween in the radial direction of the shaft. The rotor has, on the outside thereof, a conductive section comprising a conductive member. This axial-air-gap dynamo-electric machine has a first region where the inside surface of the housing faces the aforementioned conductive section radially and a second region, closer to the stator than the first region is, that extends to the coil side surfaces that face the rotor.Type: GrantFiled: April 14, 2014Date of Patent: November 2, 2021Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hirooki Tokoi, Shuuichi Takahashi, Yasuei Yoneoka, Toshifumi Suzuki, Toru Sakai, Katsuyuki Yamazaki, Norihisa Iwasaki, Ryousou Masaki, Yuji Enomoto
-
Publication number: 20210151343Abstract: A first vacuum motor includes a first pivoting shaft member, a bearing that rotatably supports the first pivoting shaft member, a disk disposed to be rotatable together with the first pivoting shaft member and having slits, a first bracket that is made of a non-magnetic material and supports the bearing, a recess formed in the first bracket to be dented in the axial direction, and a sensor unit disposed to face the disk in the axial direction via a thin wall formed by the recess. By the thin wall, the space where the sensor unit is disposed under the atmospheric pressure is isolated from the space where the disk is disposed under a reduced pressure lower than the atmospheric pressure.Type: ApplicationFiled: November 6, 2020Publication date: May 20, 2021Inventors: Masanobu HARADA, Hiromitsu AKAE, Norihisa IWASAKI
-
Patent number: 10763716Abstract: An axial-air-gap rotating electric machine with a stator bobbin is provided. The bobbin renders the respective turn counts of windings in the machine the same and minimizes the lengths of connecting wires between continuous windings regardless of the continuous turn count, the direction in which each winding is wound, and whether the number of stages is odd or even. The bobbin, which has a tubular shape that substantially matches the exterior shape of a core, is provided with flanges that extend outwards from near the respective openings in the bobbin. One of the flanges has two first notches, and the other flange has a second notch. The axial positions of the starting and finishing ends of coils on adjacent stator cores are the same, and the flanges containing the notches through which the ends of the coils are run are on the same side with respect to the openings.Type: GrantFiled: April 14, 2014Date of Patent: September 1, 2020Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hirooki Tokoi, Daisuke Kitajima, Tomonori Kawagoe, Katsuyuki Yamazaki, Toru Sakai, Shuuichi Takahashi, Toshifumi Suzuki, Norihisa Iwasaki, Ryousou Masaki, Yuji Enomoto
-
Patent number: 10530210Abstract: To ensure ready assembly of a stator and reliably reduce the shaft voltage in an axial air gap rotating electric machine, an axial air gap rotating electric machine has a circular ring-shaped stator formed by a plurality of stator cores arranged about a rotational axis direction in a ring shape. Each stator core comprises a tubular bobbin and a coil, with the tubular bobbin having an iron core inserted into a bobbin inner tubular portion substantially matching the peripheral shape of the iron core. The axial air gap rotating electric machine has a first conductive member having a horizontal portion and a vertical portion contacting the end surface of the bobbin opening portion. The horizontal portion contacts parts of the iron core outer peripheral surface and the inner peripheral surface of the bobbin inner tubular portion, and the vertical portion is conductively connected to the inner circumferential housing surface.Type: GrantFiled: April 11, 2014Date of Patent: January 7, 2020Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hirooki Tokoi, Shuuichi Takahashi, Yasuei Yoneoka, Toshifumi Suzuki, Toru Sakai, Katsuyuki Yamazaki, Ryousou Masaki, Norihisa Iwasaki, Yuji Enomoto
-
Patent number: 9789568Abstract: An aluminum wire body, in which an aluminum or aluminum alloy electric wire and a metal to be joined are joined by solder, wherein the solder includes an oxide glass including vanadium and a conducting particle. Preferably, the conducting particle contained in the solder is 90% by volume or less and the oxide glass is 20% by volume to 90% by volume. Further preferably, the oxide glass includes 40% by mass or more of Ag2O in terms of oxides and the glass transition point is 180° C. or less.Type: GrantFiled: February 11, 2014Date of Patent: October 17, 2017Assignee: Hitachi, Ltd.Inventors: Takuya Aoyagi, Motomune Kodama, Takashi Naito, Tadashi Fujieda, Yuichi Sawai, Masanori Miyagi, Haruo Akahoshi, Norihisa Iwasaki
-
Publication number: 20170194823Abstract: This invention reduces the shaft voltage of an axial-air-gap dynamo-electric machine while ensuring high output and high efficiency. Said axial-air-gap dynamo-electric machine comprises the following: a stator comprising a plurality of stator cores, each of which comprises a core and a coil, arranged in a circle around a shaft; a housing, the inside surface of which faces the stator radially; and at least one rotor, the surface of which faces the surface of the stator with a prescribed air gap interposed therebetween in the radial direction of the shaft. The rotor has, on the outside thereof, a conductive section comprising a conductive member. This axial-air-gap dynamo-electric machine has a first region where the inside surface of the housing faces the aforementioned conductive section radially and a second region, closer to the stator than the first region is, that extends to the coil side surfaces that face the rotor.Type: ApplicationFiled: April 14, 2014Publication date: July 6, 2017Inventors: Hirooki TOKOI, Shuuichi TAKAHASHI, Yasuei YONEOKA, Toshifumi SUZUKI, Toru SAKAI, Katsuyuki YAMAZAKI, Norihisa IWASAKI, Ryousou MASAKI, Yuji ENOMOTO
-
Publication number: 20170163112Abstract: The present invention provides an axial air-gap rotary electric machine that is provided with: a stator in which a plurality of core members, which have an iron core, a coil that is wound around the outer periphery of the iron core, and a bobbin that is disposed between the iron core and the coil, are arranged in a circular shape centred around a rotational axis; and at least one rotor that faces an end surface of the iron core with a prescribed air gap therebetween in the radial direction of the rotational axis.Type: ApplicationFiled: April 23, 2014Publication date: June 8, 2017Inventors: Hirooki TOKOI, Daisuke KITAJIMA, Tomonori KAWAGOE, Katsuyuki YAMAZAKI, Toru SAKAI, Shuuichi TAKAHASHI, Toshifumi SUZUKI, Norihisa IWASAKI, Ryousou MASAKI, Yuji ENOMOTO
-
Publication number: 20170155297Abstract: To ensure ready assembly of a stator and reliably reduce the shaft voltage in an axial air gap rotating electric machine, an axial air gap rotating electric machine has a circular ring-shaped stator formed by a plurality of stator cores arranged about a rotational axis direction in a ring shape. Each stator core comprises a tubular bobbin and a coil, with the tubular bobbin having an iron core inserted into a bobbin inner tubular portion substantially matching the peripheral shape of the iron core. The axial air gap rotating electric machine has a first conductive member having a horizontal portion and a vertical portion contacting the end surface of the bobbin opening portion. The horizontal portion contacts parts of the iron core outer peripheral surface and the inner peripheral surface of the bobbin inner tubular portion, and the vertical portion is conductively connected to the inner circumferential housing surface.Type: ApplicationFiled: April 11, 2014Publication date: June 1, 2017Inventors: Hirooki TOKOI, Shuuichi TAKAHASHI, Yasuei YONEOKA, Toshifumi SUZUKI, Toru SAKAI, Katsuyuki YAMAZAKI, Ryousou MASAKI, Norihisa IWASAKI, Yuji ENOMOTO
-
Publication number: 20170093244Abstract: Using a single bobbin, this invention makes the respective turn counts of windings in an axial-air-gap rotating electric machine the same and minimizes the lengths of connecting wires between continuous windings regardless of the continuous turn count, the direction in which each winding is wound, and whether the number of stages is odd or even. The aforementioned bobbin, which has a tubular shape that substantially matches the exterior shape of a core, is provided with flanges that extend outwards from near the respective openings in the bobbin. One of said flanges has two first notches, and the other flange has at least one second notch. The axial positions of the starting ends and finishing ends of coils on adjacent stator cores are the same, and the flanges containing the notches through which the ends of said coils are run are on the same side with respect to the abovementioned openings.Type: ApplicationFiled: April 14, 2014Publication date: March 30, 2017Inventors: Hirooki TOKOI, Daisuke KITAJIMA, Tomonori KAWAGOE, Katsuyuki YAMAZAKI, Toru SAKAI, Shuuichi TAKAHASHI, Toshifumi SUZUKI, Norihisa IWASAKI, Ryousou MASAKI, Yuji ENOMOTO
-
Patent number: 9385581Abstract: The present invention is intended to provide a magnetic gear structure that realizes a magnetic gear that transmits a torque efficiently by reducing eddy currents generated in the interior of magnets. In order to solve the subject described above, in the magnetic gear structure, a structure in which magnets are arranged in the interior of an iron core in an inner rotor portion. Bonded magnets formed by molding, for example, NdFeB powder may be used as the magnets. Since the influence of the eddy current on the side of an outer rotor having a larger pole number is large, a structure in which the magnets are arranged in the interior only of an outer rotor portion having a larger pole number is also applicable. In addition, the magnets to be embedded may be divided into a plurality of pieces. The finer the division of the magnets, the less eddy currents are generated, so that a method of further fining down and assembling the same is also effective.Type: GrantFiled: February 21, 2011Date of Patent: July 5, 2016Assignee: Hitachi, Ltd.Inventors: Yuji Enomoto, Junnosuke Nakatsugawa, Norihisa Iwasaki, Masashi Kitamura
-
Patent number: 9337708Abstract: The present invention relates to a magnetic gear type electric rotating machine. Specifically, the purpose is to provide a magnetic gear type electric rotating machine with which the intensity of a permanent magnetic field can be improved without increasing material and manufacturing costs, and deterioration of torque transmission characteristics can be prevented. To this end, in the present invention, concave and convex sections are provided on a surface of at least one of cores (12, 22) for a first permanent magnetic field (1) and a second permanent magnetic field (2). The convex sections (13) are arranged along the circumferential direction at the center sections of permanent magnetic poles (11a, 11b), and the concave sections (14) are arranged along the circumferential direction at the edge sections of the permanent magnetic poles (11a, 11b).Type: GrantFiled: June 27, 2011Date of Patent: May 10, 2016Assignee: Hitachi, Ltd.Inventors: Junnosuke Nakatsugawa, Yuji Enomoto, Norihisa Iwasaki
-
Publication number: 20150372544Abstract: It is necessary to keep the positional relation between a stator and a housing for a long time, so the stator and housing must be fixed to each other with increased adhesive strength. Since this kind of rotary electric machine is a mass-produced product, the fixing method is demanded to be simple enough to be suitable for mass production. In order to meet this demand, in a rotary electric machine, for bonding and fixing the stator and the housing for covering the stator by synthetic resin, a plurality of projecting parts are formed on the inner circumference of the housing and synthetic resin is poured into between the stator and housing to bond and fix the stator and housing.Type: ApplicationFiled: February 17, 2012Publication date: December 24, 2015Applicant: Hitachi, Ltd.Inventors: Norihisa IWASAKI, Hirooki TOKOI, Yuji ENOMOTO
-
Patent number: 9154020Abstract: An axial gap rotating-electric machine includes a stator, a rotor arranged via an air gap in the direction of an axis of rotation of a rotating-electric machine with respect to the stator, and a housing configured to accommodate the stator and the rotor, and the stator includes a plurality of stator cores arranged in the circumferential direction, coils configured to wind the peripheries of the respective stator cores, and a resin for molding the plurality of stator cores wound with the coils, and the stator cores each include a protruding portion protruding partly from the coil in the direction of axis of rotation, and a conductive member is provided so as to come into contact with peripheral surfaces of the protruding portions of the stator cores, and grounding is achieved by the conductive member.Type: GrantFiled: July 3, 2013Date of Patent: October 6, 2015Assignee: Hitachi, Ltd.Inventors: Kenta Deguchi, Hirooki Tokoi, Zhuonan Wang, Norihisa Iwasaki, Yuji Enomoto
-
Patent number: 9143025Abstract: A magnetic gear mechanism including a simplified assembly of a magnetic flux modulating section in the magnetic gear mechanism which improves the strength thereof. In the magnetic flux modulating section of the magnetic gear mechanism, the magnetic flux modulating section being formed of a magnetic member and a non-magnetic member, a piece of the magnetic member and a piece of the non-magnetic member are separately produced. The piece of the magnetic member is sandwiched between circumferential projections provided in pieces of the non-magnetic member, and the magnetic member and the non-magnetic member and bearing holding sections form a structure in which the magnetic member and the non-magnetic member are fitted into the bearing holding sections by using recessed portions provided in the bearing holding sections and axial projections provided in the pieces of the non-magnetic member. This structure simplifies production and improves strength.Type: GrantFiled: June 29, 2012Date of Patent: September 22, 2015Assignee: HITACHI, LTD.Inventors: Norihisa Iwasaki, Yuji Enomoto, Junnosuke Nakatsugawa, Masashi Kitamura, Kinya Kobayashi, Hironori Matsumoto
-
Publication number: 20140285039Abstract: An aluminum wire body, in which an aluminum or aluminum alloy electric wire and a metal to be joined are joined by solder, wherein the solder includes an oxide glass including vanadium and a conducting particle. Preferably, the conducting particle contained in the solder is 90% by volume or less and the oxide glass is 20% by volume to 90% by volume. Further preferably, the oxide glass includes 40% by mass or more of Ag2O in terms of oxides and the glass transition point is 180° C. or less.Type: ApplicationFiled: February 11, 2014Publication date: September 25, 2014Applicant: Hitachi, Ltd.Inventors: Takuya AOYAGI, Motomune KODAMA, Takashi NAITO, Tadashi FUJIEDA, Yuichi SAWAI, Masanori MIYAGI, Haruo AKAHOSHI, Norihisa IWASAKI
-
Patent number: 8742704Abstract: The present invention relates to an AC motor control device and, particularly, to provide an AC control device capable of simply setting a state quantity of an AC motor non-linearly variable, in accordance with the motor driving state and using the setting in motor control, the present invention can be achieved by including a state quantity calculating unit (13, 13a, 13b, 13c) for calculating a state quantity corresponding to a coil interlinkage flux which is an internal quantity of the motor, calculating a setting value of the coil interlinkage flux defined on one axis out of two axes, that is, d and q axes, with a function formula using a current defined on the same one of the axes and a function formula using a state variable defined on the other one of the axes.Type: GrantFiled: February 26, 2010Date of Patent: June 3, 2014Assignee: Hitachi, Ltd.Inventors: Junnosuke Nakatsugawa, Yoshitaka Iwaji, Norihisa Iwasaki, Hirokazu Nagura
-
Publication number: 20140132099Abstract: The present invention relates to a magnetic gear-type electric rotating machine. Specifically, an object is to provide a magnetic gear-type electric rotating machine with which an intensity of a permanent magnet field system can be improved and a decrease of torque transmission characteristics can be prevented without increasing material and manufacturing costs. To this end, in the present invention, a recess and a projection are provided on a surface of at least one of cores 12, 22 of a first permanent magnet field system 1 and a second permanent magnet field system 2. A projection portion 13 is disposed at a central part in a circumferential direction of permanent magnet magnetic poles 11a, 11b, and a recess portion 14 is disposed at an edge in the circumferential direction of the permanent magnet magnetic poles 11a, 11b.Type: ApplicationFiled: June 27, 2011Publication date: May 15, 2014Applicant: Hitachi, Ltd.Inventors: Junnosuke Nakatsugawa, Yuji Enomoto, Norihisa Iwasaki
-
Publication number: 20140084728Abstract: A concentrated winding motor having the combination of the number of poles and the number of slots of 10:12 or 14:12 includes coils in the same phase that are adjacent to each other and have mutually different numbers of coil turns.Type: ApplicationFiled: August 22, 2013Publication date: March 27, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Norihisa IWASAKI, Masashi KITAMURA, Hiroshi KANAZAWA, Shozo KAWASAKI