Patents by Inventor Yuji Nakazawa

Yuji Nakazawa 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: 11005349
    Abstract: An electric motor system includes a drive shaft that rotationally drives a load, a bearingless motor, a power source unit, and a control unit. The bearingless motor includes a rotor and a stator having armature and support windings. The bearingless motor rotationally drives the drive shaft and supports a radial load of the drive shaft in a contactless manner. The power source unit applies a voltage to the armature and support windings. The control unit controls the power source unit so that a radial support force that is a sum of a radial support force caused by a support current and a radial support force caused by both the support current and an armature current is output, and so that one of an armature voltage across the armature winding and the support current is increased and the other of the armature voltage and the support current is decreased.
    Type: Grant
    Filed: November 4, 2020
    Date of Patent: May 11, 2021
    Assignee: Daikin Industries, Ltd.
    Inventors: Takaaki Ono, Yusuke Irino, Yuji Nakazawa
  • Publication number: 20210115929
    Abstract: A drive support unit of a turbo compressor includes at least one bearingless motor. The at least one bearingless motor includes a rotor-stator pair constituted by a rotor and a stator, and is configured to rotationally drive a drive shaft and to support a radial load of the drive shaft in a contactless manner. Accordingly, it is possible to provide a turbo compressor to which a bearingless motor is applied.
    Type: Application
    Filed: May 8, 2018
    Publication date: April 22, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yuji NAKAZAWA, Atsushi SAKAWAKI, Hirofumi HIGASHI, Taiichi NOSE, Takaaki ONO, Yusuke IRINO
  • Publication number: 20210108646
    Abstract: A radial load of a drive shaft is supported by only a plurality of bearingless motors. Maximum values of the radial load acting on the plurality of bearingless motors are not uniform. The bearingless motor, the maximum value of the radial load acting on which is the largest, has a greater maximum value of supporting magnetic flux generated to generate an electromagnetic force for supporting the radial load, compared with the bearingless motor, the maximum value of the radial load acting on which is the smallest. This configuration allows a reduction in size of a rotary system including a load and a drive shaft in an electric motor system.
    Type: Application
    Filed: April 27, 2018
    Publication date: April 15, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yuji NAKAZAWA, Atsushi SAKAWAKI
  • Patent number: 10965199
    Abstract: An electric motor system includes a drive shaft that rotationally drives a load, a bearingless motor, a power source unit, and a control unit. The bearingless motor includes a rotor and a stator having armature and support windings. The bearingless motor rotationally drives the drive shaft and supports a radial load of the drive shaft in a contactless manner. The power source unit applies a voltage to the armature and support windings. The control unit controls the power source unit so that a radial support force that is a sum of a radial support force caused by a support current and a radial support force caused by both the support current and an armature current is output, and so that one of an armature voltage across the armature winding and the support current is increased and the other of the armature voltage and the support current is decreased.
    Type: Grant
    Filed: November 4, 2020
    Date of Patent: March 30, 2021
    Assignee: Daikin Industries, Ltd.
    Inventors: Takaaki Ono, Yusuke Irino, Yuji Nakazawa
  • Publication number: 20210050765
    Abstract: An electric motor system includes a drive shaft that rotationally drives a load, a bearingless motor, a power source unit, and a control unit. The bearingless motor includes a rotor and a stator having armature and support windings. The bearingless motor rotationally drives the drive shaft and supports a radial load of the drive shaft in a contactless manner. The power source unit applies a voltage to the armature and support windings. The control unit controls the power source unit so that a radial support force that is a sum of a radial support force caused by a support current and a radial support force caused by both the support current and an armature current is output, and so that one of an armature voltage across the armature winding and the support current is increased and the other of the armature voltage and the support current is decreased.
    Type: Application
    Filed: November 4, 2020
    Publication date: February 18, 2021
    Inventors: Takaaki ONO, Yusuke IRINO, Yuji NAKAZAWA
  • Publication number: 20210010536
    Abstract: A thrust magnetic bearing includes a stator having a coil, and a rotor. The stator includes main and auxiliary stator magnetic-pole surfaces. The rotor includes main and auxiliary rotor magnetic-pole surfaces facing the main and auxiliary stator magnetic-pole surfaces. When an electric current flows in the coil, an electromagnetic force in an axial direction is generated between the main stator and rotor magnetic-pole surfaces, and an electromagnetic force in a radial direction is generated between the auxiliary stator and rotor magnetic-pole surfaces. When the rotor is displaced in the radial direction, a radial force that acts on the rotor between the auxiliary stator and rotor magnetic-pole surfaces is increased in a direction of the displacement, and a radial force that acts on the rotor between the main stator and rotor magnetic-pole surfaces is increased in a direction opposite to the direction of the displacement.
    Type: Application
    Filed: September 25, 2020
    Publication date: January 14, 2021
    Inventors: Shouhei YAMASUSO, Yuji NAKAZAWA, Keiji AOTA
  • Publication number: 20200350804
    Abstract: The stator includes a stator core, a support electric wire formed by one or more conductive wires, and a drive electric wire formed by one or more conductive wires. The stator core includes an annular shaped back yoke and a plurality of teeth on an inner periphery of the back yoke. The support electric wire is disposed so as to pass through a plurality of slots respectively formed between the teeth, and forms a winding portion that generates an electromagnetic force for supporting the rotor in a non-contact manner by being energized. The drive electric wire is disposed so as to pass through the plurality of slots, and forms a winding portion that generates an electromagnetic force for rotating the rotor by being energized. A cross-sectional area per conductive wire of the support electric wire differs from a cross-sectional area per conductive wire of the drive electric wire.
    Type: Application
    Filed: October 25, 2018
    Publication date: November 5, 2020
    Inventors: Takaaki ONO, Yusuke IRINO, Tatsuya TONARI, Yuji NAKAZAWA, Keiji AOTA, Atsushi SAKAWAKI
  • Patent number: 10767890
    Abstract: A drive shaft rotates a load. A drive support rotates the drive shaft and supports a radial load of the drive shaft in a non-contact manner, by an electromagnetic force generated by the flow of a current within a predetermined current range through the drive support. A control section controls an operation of the load based on a magnetic flux margin degree expressed by the difference between a total magnetic flux amount generated at the drive support and a predetermined limit of the total magnetic flux amount for the drive support. The total magnetic flux amount includes driving magnetic flux and the supporting magnetic flux in a predetermined operation region of the load. The driving magnetic flux is generated at the drive support for rotating the drive shaft. The supporting magnetic flux is generated at the drive support for supporting a radial load of the drive shaft.
    Type: Grant
    Filed: May 8, 2018
    Date of Patent: September 8, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Yuji Nakazawa, Atsushi Sakawaki
  • Publication number: 20200096220
    Abstract: A drive shaft rotates a load. A drive support rotates the drive shaft and supports a radial load of the drive shaft in a non-contact manner, by an electromagnetic force generated by the flow of a current within a predetermined current range through the drive support. A control section controls an operation of the load based on a magnetic flux margin degree expressed by the difference between a total magnetic flux amount generated at the drive support and a predetermined limit of the total magnetic flux amount for the drive support. The total magnetic flux amount includes driving magnetic flux and the supporting magnetic flux in a predetermined operation region of the load. The driving magnetic flux is generated at the drive support for rotating the drive shaft. The supporting magnetic flux is generated at the drive support for supporting a radial load of the drive shaft.
    Type: Application
    Filed: May 8, 2018
    Publication date: March 26, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yuji NAKAZAWA, Atsushi SAKAWAKI
  • Patent number: 9964146
    Abstract: A magnetic bearing which would reduce a leakage magnetic flux to be generated between teeth is provided. A predetermined one of its teeth (24) is configured so that a pitch (P1) between the predetermined tooth (24) and one of two adjacent teeth (24) that are located on clockwise and counterclockwise sides thereof in the circumferential direction is broader than a pitch (P2) between the predetermined tooth (24) and the other tooth (24) and that a magnetic flux flows in the same radial direction through the predetermined tooth (24) and the tooth (24) spaced from the predetermined tooth (24) by the narrower pitch (P1) but flows in two different radial directions through the predetermined tooth (24) and the tooth (24) spaced from the predetermined tooth (24) by the broader pitch (P2).
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: May 8, 2018
    Assignee: Daikin Industries, Ltd.
    Inventors: Yusuke Irino, Yuji Nakazawa
  • Publication number: 20170234364
    Abstract: A magnetic bearing includes a controller dividing a control region in two regions based on an individual difference between electromagnets regarding a correlation between two or more parameters among a current flowing through the electromagnets, a number of flux linkages, a gap width, magnetic energy, magnetic co-energy, electromagnetic force, and a parameter derived using these parameters. In a first control region with a small individual difference, the controller uses a control model common for all of the electromagnets. In a second control region with a large individual difference, the controller performs position control of a drive shaft using control models provided one for each of the electromagnets or one for each of a predetermined number of electromagnet groups.
    Type: Application
    Filed: August 31, 2015
    Publication date: August 17, 2017
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi SAKAWAKI, Yuji NAKAZAWA
  • Patent number: 9689398
    Abstract: A magnetic bearing body supports a rotating shaft using a combined electromagnetic force of a pair of control electromagnets without contact. A controller detects a control index value based on a first coil current passed through a coil of a first control electromagnet of the pair of control electromagnets which generates an electromagnetic force in the same direction as that of a load exerted on the rotating shaft, the control index value being an index of the degree of margin for error in control depending on a value of the first coil current. And the controller controls a middle value of a pair of coil currents passed through the respective corresponding coils of the pair of control electromagnets so that the control index value approaches a predetermined target index value.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: June 27, 2017
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi Sakawaki, Yuji Nakazawa, Yusuke Irino, Naoya Yamashita
  • Patent number: 9660499
    Abstract: A stator is provided which exerts a combined electromagnetic force of a plurality of electromagnets on a drive shaft having a fluctuating load. A controller is provided which controls a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through a coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform a position control on the drive shaft. The controller adjusts the second coil current to reduce an average value of the second coil current.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: May 23, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Atsushi Sakawaki, Yuji Nakazawa, Yusuke Irino, Naoya Yamashita
  • Publication number: 20150233422
    Abstract: A magnetic bearing which would reduce a leakage magnetic flux to be generated between teeth is provided. A predetermined one of its teeth (24) is configured so that a pitch (P1) between the predetermined tooth (24) and one of two adjacent teeth (24) that are located on clockwise and counterclockwise sides thereof in the circumferential direction is broader than a pitch (P2) between the predetermined tooth (24) and the other tooth (24) and that a magnetic flux flows in the same radial direction through the predetermined tooth (24) and the tooth (24) spaced from the predetermined tooth (24) by the narrower pitch (P1) but flows in two different radial directions through the predetermined tooth (24) and the tooth (24) spaced from the predetermined tooth (24) by the broader pitch (P2).
    Type: Application
    Filed: August 26, 2013
    Publication date: August 20, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yusuke Irino, Yuji Nakazawa
  • Patent number: 9081199
    Abstract: The present invention provides: a protein having dipeptide-synthesizing activity; DNA encoding the protein; a recombinant DNA comprising the DNA; a transformant transformed with the recombinant DNA; a process for producing the protein having dipeptide-synthesizing activity using the transformant or the like; a process for producing a dipeptide using the protein having dipeptide-synthesizing activity; and a process for producing a dipeptide using, as an enzyme source, a culture of a transformant or a microorganism which produces the protein having dipeptide-synthesizing activity or the like.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: July 14, 2015
    Assignee: KYOWA HAKKO BIO CO., LTD.
    Inventors: Kuniki Kino, Yuji Nakazawa, Makoto Yagasaki
  • Publication number: 20140363321
    Abstract: A magnetic bearing body supports a rotating shaft using a combined electromagnetic force of a pair of control electromagnets without contact. A controller detects a control index value based on a first coil current passed through a coil of a first control electromagnet of the pair of control electromagnets which generates an electromagnetic force in the same direction as that of a load exerted on the rotating shaft, the control index value being an index of the degree of margin for error in control depending on a value of the first coil current. And the controller controls a middle value of a pair of coil currents passed through the respective corresponding coils of the pair of control electromagnets so that the control index value approaches a predetermined target index value.
    Type: Application
    Filed: December 19, 2012
    Publication date: December 11, 2014
    Inventors: Atsushi Sakawaki, Yuji Nakazawa, Yusuke Irino, Naoya Yamashita
  • Publication number: 20140234139
    Abstract: A stator is provided which exerts a combined electromagnetic force of a plurality of electromagnets on a drive shaft having a fluctuating load. A controller is provided which controls a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through a coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform a position control on the drive shaft. The controller adjusts the second coil current to reduce an average value of the second coil current.
    Type: Application
    Filed: May 29, 2012
    Publication date: August 21, 2014
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi Sakawaki, Yuji Nakazawa, Yusuke Irino, Naoya Yamashita
  • Publication number: 20090197303
    Abstract: The present invention provides: a protein having dipeptide-synthesizing activity; DNA encoding the protein; a recombinant DNA comprising the DNA; a transformant transformed with the recombinant DNA; a process for producing the protein having dipeptide-synthesizing activity using the transformant or the like; a process for producing a dipeptide using the protein having dipeptide-synthesizing activity; and a process for producing a dipeptide using, as an enzyme source, a culture of a transformant or a microorganism which produces the protein having dipeptide-synthesizing activity or the like.
    Type: Application
    Filed: December 27, 2006
    Publication date: August 6, 2009
    Applicant: KYOWA HAKKO KOGYO CO., LTD.
    Inventors: Kuniki Kino, Atsushi Noguchi, Yuji Nakazawa, Makoto Yagasaki
  • Publication number: 20090047706
    Abstract: The present invention provides: a protein having dipeptide-synthesizing activity; DNA encoding the protein; a recombinant DNA comprising the DNA; a transformant transformed with the recombinant DNA; a process for producing the protein having dipeptide-synthesizing activity using the transformant or the like; a process for producing a dipeptide using the protein having dipeptide-synthesizing activity; and a process for producing a dipeptide using, as an enzyme source, a culture of a transformant or a microorganism which produces the protein having dipeptide-synthesizing activity or the like.
    Type: Application
    Filed: March 17, 2006
    Publication date: February 19, 2009
    Applicant: KYOWA HAKKO KOGYO CO., LTD.
    Inventors: Kuniki Kino, Yuji Nakazawa, Makoto Yagasaki
  • Patent number: 7171991
    Abstract: A fixed quantity supply equipment for inflators is combined with a heat-treatment equipment for inflators. A bottom portion 22 of an inflator accommodating chamber 20 at a predetermined position is opened by an opening/closing means 30 utilizing pneumatics to cause inflators 40 inside the inflator accommodating chamber to fall naturally. Thereafter, the bottom portion 22 is closed, the bottom portion 22 of the next inflator accommodating chamber 20 is opened to cause inflators 40 inside the same to fall naturally. These actions are repeated to supply the inflators 40 in a constant number.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: February 6, 2007
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Keishi Aoyama, Yuji Nakazawa