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: 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: 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
-
Patent number: 8781763Abstract: 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: GrantFiled: August 16, 2011Date of Patent: July 15, 2014Assignee: Hitachi, Ltd.Inventors: Shigeru Kakugawa, Masashi Kitamura, Kohji Maki, Shinji Sugimoto
-
Publication number: 20140084741Abstract: 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: ApplicationFiled: August 21, 2013Publication date: March 27, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Norihisa IWASAKI, Masashi KITAMURA, Hiroshi KANAZAWA, Shozo KAWASAKI
-
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
-
Publication number: 20130320795Abstract: 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: ApplicationFiled: February 21, 2011Publication date: December 5, 2013Applicant: Hitachi, Ltd.Inventors: Yuji Enomoto, Junnosuke Nakatsugawa, Norihisa Iwasaki, Masashi Kitamura
-
Patent number: 8513842Abstract: 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: GrantFiled: February 24, 2011Date of Patent: August 20, 2013Assignee: Hitachi, Ltd.Inventors: Norihisa Iwasaki, Junnosuke Nakatsugawa, Yuji Enomoto, Masashi Kitamura
-
Publication number: 20130002076Abstract: 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: ApplicationFiled: June 29, 2012Publication date: January 3, 2013Applicant: HITACHI, LTD.Inventors: Norihisa Iwasaki, Yuji Enomoto, Junnosuke Nakatsugawa, Masashi Kitamura, Kinya Kobayashi, Hironori Matsumoto
-
Patent number: 8259990Abstract: 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: GrantFiled: July 3, 2007Date of Patent: September 4, 2012Assignee: Mitsubishi Electric CorporationInventors: Masashi Kitamura, Tadashi Ohi
-
Publication number: 20120130259Abstract: 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: ApplicationFiled: January 30, 2012Publication date: May 24, 2012Applicant: OMRON HEALTHCARE Co., Ltd.Inventors: Masashi KITAMURA, Kai ZHONG, Chun-Peng ZHANG
-
Publication number: 20120053866Abstract: 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: ApplicationFiled: August 16, 2011Publication date: March 1, 2012Inventors: Shigeru KAKUGAWA, Masashi KITAMURA, Kohji MAKI, Shinji SUGIMOTO
-
Publication number: 20120038236Abstract: 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: ApplicationFiled: October 24, 2011Publication date: February 16, 2012Applicant: Hitachi, Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
-
Patent number: 8067871Abstract: 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: GrantFiled: March 18, 2009Date of Patent: November 29, 2011Assignee: Hitachi, Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
-
Publication number: 20110234028Abstract: 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: ApplicationFiled: February 24, 2011Publication date: September 29, 2011Inventors: Norihisa IWASAKI, Junnosuke NAKATSUGAWA, Yuji ENOMOTO, Masashi KITAMURA
-
Publication number: 20110224560Abstract: 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: ApplicationFiled: September 17, 2010Publication date: September 15, 2011Applicant: OMRON HEALTHCARE CO., LTD.Inventors: Masashi KITAMURA, Minoru TANIGUCHI, Yoichiro WATANABE, Lan-Lan WANG, Yuuichi NORO
-
Patent number: 7956509Abstract: 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: GrantFiled: May 21, 2010Date of Patent: June 7, 2011Assignee: Hitachi, Ltd.Inventors: Fumio Tajima, Masashi Kitamura, Yuji Enomoto, Yuji Nomoto, Kenya Takarai
-
Publication number: 20100226803Abstract: 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: ApplicationFiled: May 21, 2010Publication date: September 9, 2010Applicant: Hitachi, Ltd.Inventors: Fumio TAJIMA, Masashi Kitamura, Yuji Enomoto, Yuji Nomoto, Kenya Takarai
-
Patent number: 7768158Abstract: 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: GrantFiled: June 25, 2007Date of Patent: August 3, 2010Assignee: Hitachi, Ltd.Inventors: Masashi Kitamura, Fumio Tajima, Yusuke Akami, Noriyuki Utsumi, Ken Nakamura, Kazuaki Shibahara
-
Patent number: 7750529Abstract: 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: GrantFiled: July 18, 2007Date of Patent: July 6, 2010Assignee: Hitachi, Ltd.Inventors: Fumio Tajima, Masashi Kitamura, Yuji Enomoto, Yuji Nomoto, Kenya Takarai
-
Patent number: RE44037Abstract: 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: GrantFiled: December 23, 2009Date of Patent: March 5, 2013Assignee: Hitachi, Ltd.Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara