Patents by Inventor Masashi Kitamura

Masashi Kitamura 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: 9385581
    Abstract: 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: Grant
    Filed: February 21, 2011
    Date of Patent: July 5, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Yuji Enomoto, Junnosuke Nakatsugawa, Norihisa Iwasaki, Masashi Kitamura
  • Patent number: 9143025
    Abstract: 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: Grant
    Filed: June 29, 2012
    Date of Patent: September 22, 2015
    Assignee: HITACHI, LTD.
    Inventors: Norihisa Iwasaki, Yuji Enomoto, Junnosuke Nakatsugawa, Masashi Kitamura, Kinya Kobayashi, Hironori Matsumoto
  • Patent number: 8781763
    Abstract: A method for analyzing an operating point of a permanent magnet performs electromagnetic field analysis based on a B-H curve of the permanent magnet and element data concerning a finite number of elements into which the permanent magnet is divided to obtain the operating point of the permanent magnet. The method includes the steps of storing data of inputted B-H curve; obtaining magnetic flux densities and magnetic fields in plural regions of the permanent magnet by performing the electromagnetic field analysis based on the data of the B-H curve; and obtaining the operating point of each of the elements based on the result of the electromagnetic field analysis by employing a variable, the variable continuously varying in a first quadrant, in a second quadrant, in a third quadrant, and over these quadrants of the B-H curve and linearly varying with respect to the magnetic flux density and magnetic field.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: July 15, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Kakugawa, Masashi Kitamura, Kohji Maki, Shinji Sugimoto
  • Publication number: 20140084741
    Abstract: A permanent magnet rotating electrical machine includes: a stator including a stator core and a polyphase stator coil incorporated into the stator core; and a rotor including a rotor core and a plurality of permanent magnets which is fixed to the outer peripheral surface of the rotor core, wherein the stator core has a plurality of stator tooth portions forming a slot into which the stator coil is stored, the rotor core is rotatably disposed in opposed relation to the stator, and the stator tooth portion includes at the tip thereof at least one nonmagnetic inner region.
    Type: Application
    Filed: August 21, 2013
    Publication date: March 27, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Norihisa IWASAKI, Masashi KITAMURA, Hiroshi KANAZAWA, Shozo KAWASAKI
  • Publication number: 20140084728
    Abstract: 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: Application
    Filed: August 22, 2013
    Publication date: March 27, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Norihisa IWASAKI, Masashi KITAMURA, Hiroshi KANAZAWA, Shozo KAWASAKI
  • Publication number: 20130320795
    Abstract: 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: Application
    Filed: February 21, 2011
    Publication date: December 5, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Yuji Enomoto, Junnosuke Nakatsugawa, Norihisa Iwasaki, Masashi Kitamura
  • Patent number: 8513842
    Abstract: There is disclosed a rotary electromotor including a stator, a stator winding on the stator, a stator frame, a rotator, end covers, and a highly heat-conductive member. The stator has a plurality of magnetic poles. The stator frame supports the stator. The rotator is supported by the stator with a gap therefrom such that the rotator is rotatable. The end covers close opposite ends of the stator frame. The highly heat-conductive member is fixed by a resin material in a space defined inside the stator, the stator frame, and the end covers.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: August 20, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Norihisa Iwasaki, Junnosuke Nakatsugawa, Yuji Enomoto, Masashi Kitamura
  • Publication number: 20130002076
    Abstract: 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: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Applicant: HITACHI, LTD.
    Inventors: Norihisa Iwasaki, Yuji Enomoto, Junnosuke Nakatsugawa, Masashi Kitamura, Kinya Kobayashi, Hironori Matsumoto
  • Patent number: 8259990
    Abstract: A monitoring and operation image integrating system include: a display signal synthesizing unit to which a display signal from a plurality of safety equipments and that from non-safety equipment are inputted, and which synthesizes a display signal from the plural safety equipments and a display signal from the non-safety equipment; display signal switching unit to which a state signal showing an operation state of whether or not each monitoring and operation screen image of the plural safety equipments displays an operating device of the equipment, is inputted, and which switches a display signal from a safety equipment to be synthesized by the display signal synthesizing unit based on the inputted state signals; and an integrated monitoring and operation screen display that displays a display signal synthesized by the display signal synthesizing unit as an integrated monitoring and operation screen of a plant.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: September 4, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masashi Kitamura, Tadashi Ohi
  • Publication number: 20120130259
    Abstract: In a blood pressure monitor, when a main unit is mounted on a mounting surface such as a desk, a bulging region of a first tube and a bulging region of a second tube, both located at a rear surface of the main unit, come into contact with the mounting surface. This can avoid the main unit from sliding even when the main unit is pulled by the first and second tubes. Consequently, a blood pressure monitor has a configuration in which the main unit is less likely to slide over the mounting surface even when the main unit is pulled by tubes connected to the main unit.
    Type: Application
    Filed: January 30, 2012
    Publication date: May 24, 2012
    Applicant: OMRON HEALTHCARE Co., Ltd.
    Inventors: Masashi KITAMURA, Kai ZHONG, Chun-Peng ZHANG
  • Publication number: 20120053866
    Abstract: A method for analyzing an operating point of a permanent magnet performs electromagnetic field analysis based on a B-H curve of the permanent magnet and element data concerning a finite number of elements into which the permanent magnet is divided to obtain the operating point of the permanent magnet. The method includes the steps of storing data of inputted B-H curve; obtaining magnetic flux densities and magnetic fields in plural regions of the permanent magnet by performing the electromagnetic field analysis based on the data of the B-H curve; and obtaining the operating point of each of the elements based on the result of the electromagnetic field analysis by employing a variable, the variable continuously varying in a first quadrant, in a second quadrant, in a third quadrant, and over these quadrants of the B-H curve and linearly varying with respect to the magnetic flux density and magnetic field.
    Type: Application
    Filed: August 16, 2011
    Publication date: March 1, 2012
    Inventors: Shigeru KAKUGAWA, Masashi KITAMURA, Kohji MAKI, Shinji SUGIMOTO
  • Publication number: 20120038236
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Application
    Filed: October 24, 2011
    Publication date: February 16, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
  • Patent number: 8067871
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: November 29, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
  • Publication number: 20110234028
    Abstract: There is disclosed a rotary electromotor including a stator, a stator winding on the stator, a stator frame, a rotator, end covers, and a highly heat-conductive member. The stator has a plurality of magnetic poles. The stator frame supports the stator. The rotator is supported by the stator with a gap therefrom such that the rotator is rotatable. The end covers close opposite ends of the stator frame. The highly heat-conductive member is fixed by a resin material in a space defined inside the stator, the stator frame, and the end covers.
    Type: Application
    Filed: February 24, 2011
    Publication date: September 29, 2011
    Inventors: Norihisa IWASAKI, Junnosuke NAKATSUGAWA, Yuji ENOMOTO, Masashi KITAMURA
  • Publication number: 20110224560
    Abstract: A sphygmomanometer cuff is provided with an upper arm support stand arranged to support an upper arm, and an arm band arranged to be wound around the upper arm. The upper arm support stand includes an upper arm support surface arranged to support the upper arm while the upper arm is placed thereon, a winding mechanism arranged to pull one end of the arm band in the winding direction so as to wind a portion of the arm band close to the one end, and a hook arranged to engage a portion of the arm band close to another end pulled out from the winding mechanism against a pulling force applied by the winding mechanism. The upper arm supported on the upper arm support stand is tightened by the upper arm support surface and the portion of the arm band pulled out from the winding mechanism in a state where the portion of the arm band close to the other end is engaged with the hook.
    Type: Application
    Filed: September 17, 2010
    Publication date: September 15, 2011
    Applicant: OMRON HEALTHCARE CO., LTD.
    Inventors: Masashi KITAMURA, Minoru TANIGUCHI, Yoichiro WATANABE, Lan-Lan WANG, Yuuichi NORO
  • Patent number: 7956509
    Abstract: A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: June 7, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Masashi Kitamura, Yuji Enomoto, Yuji Nomoto, Kenya Takarai
  • Publication number: 20100226803
    Abstract: A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.
    Type: Application
    Filed: May 21, 2010
    Publication date: September 9, 2010
    Applicant: Hitachi, Ltd.
    Inventors: Fumio TAJIMA, Masashi Kitamura, Yuji Enomoto, Yuji Nomoto, Kenya Takarai
  • Patent number: 7768158
    Abstract: A cylindrical linear motor includes a stator and a movable element disposed via a clearance with respect to the stator and movable rectilinearly with respect to the stator. The movable element has a plurality of permanent magnets fixed to a movable element core. The stator salient poles 3b are pitched at ?s and the permanent magnets 11 are pitched at ?p so that a relationship of 3/4<?p/?s<3/2 is established.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: August 3, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Masashi Kitamura, Fumio Tajima, Yusuke Akami, Noriyuki Utsumi, Ken Nakamura, Kazuaki Shibahara
  • Patent number: 7750529
    Abstract: A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: July 6, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Masashi Kitamura, Yuji Enomoto, Yuji Nomoto, Kenya Takarai
  • Patent number: RE44037
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: March 5, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara