Patents by Inventor Akio Yamagiwa

Akio Yamagiwa 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: 9712006
    Abstract: A first rotor core including a plurality of gaps penetrating through the first rotor core along an axial direction is provided. A second rotor core being in contact with an axial end of the first rotor core and having a plurality of magnet-housing slots facing the gaps is also provided. The gaps have a magnetic resistance lower than that of the magnet-housing slots.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: July 18, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Toshinari Kondou, Yoshiki Yasuda, Akio Yamagiwa
  • Patent number: 9438090
    Abstract: A motor includes a driving shaft, a rotor attached to the driving shaft, and a stator having a substantially cylindrical stator core provided around the rotor, and a plurality of coils wound around the stator core in a distributed winding manner. The stator core includes three separated stator core parts aligned along a peripheral direction, and each of the coils is disposed so as not to lie astride any two of the three separated stator core parts. At least one coil end of the plurality of the coils is disposed to pass through an inner side relative to an inner peripheral surface of the stator core.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: September 6, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Toshinari Kondou, Yoshiki Yasuda, Akio Yamagiwa
  • Publication number: 20150135519
    Abstract: A motor includes a driving shaft, a rotor attached to the driving shaft, and a stator having a substantially cylindrical stator core provided around the rotor, and a plurality of coils wound around the stator core in a distributed winding manner. The stator core includes three separated stator core parts aligned along a peripheral direction, and each of the coils is disposed so as not to lie astride any two of the three separated stator core parts. At least one coil end of the plurality of the coils is disposed to pass through an inner side relative to an inner peripheral surface of the stator core.
    Type: Application
    Filed: January 23, 2015
    Publication date: May 21, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Toshinari KONDOU, Yoshiki YASUDA, Akio YAMAGIWA
  • Patent number: 9013136
    Abstract: A three-phase AC motor (4) has a configuration in which a q-axis inductance is larger than a d-axis inductance by a predetermined amount or more to allow smoothing of power fluctuations due to the power supply voltage of the AC power source (3).
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: April 21, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Akio Yamagiwa, Toshinari Kondou, Yoshihito Sanga
  • Patent number: 8853909
    Abstract: A first non-magnetic portion, a second non-magnetic portion, and a third non-magnetic portion are arranged around an axis, from an end toward the center of a permanent magnet burying hole. A fourth non-magnetic portion is further provided between the second non-magnetic portion and the third non-magnetic portion. Angles around the axis are determined as follows with reference to a position between permanent magnet burying holes. The position between the first non-magnetic portion and the second non-magnetic portion is expressed by a first angle. The position between the third non-magnetic portion and the fourth non-magnetic portion is expressed by a second angle, and the second angle is twice the first angle. The end of the third non-magnetic portion located closer to the pole center is expressed by a third angle.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: October 7, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Keiji Aota, Akio Yamagiwa, Yoshiki Yasuda
  • Patent number: 8803395
    Abstract: A rotor includes a plurality of permanent magnets arranged annularly around an axis and a rotor core. The rotor core includes 2N (where N is a natural number) magnetic pole faces and a plurality of magnetic barriers. The 2N magnetic pole faces produce, due to the plurality of permanent magnets, magnetic poles in a radial direction in such a manner that different polarities can be alternately produced around the axis. The magnetic barriers are provided at a side close to the magnetic pole faces relative to the permanent magnets. At least one of the magnetic barriers is provided in each region obtained by equally dividing the rotor core into (2N+1), ((N+1)×2) or ((N?1)×2) angles around the axis.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: August 12, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Shintarou Araki, Akio Yamagiwa
  • Publication number: 20140021820
    Abstract: A first rotor core including a plurality of gaps penetrating through the first rotor core along an axial direction is provided. A second rotor core being in contact with an axial end of the first rotor core and having a plurality of magnet-housing slots facing the gaps is also provided. The gaps have a magnetic resistance lower than that of the magnet-housing slots.
    Type: Application
    Filed: March 21, 2012
    Publication date: January 23, 2014
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Toshinari Kondou, Yoshiki Yasuda, Akio Yamagiwa
  • Patent number: 8598763
    Abstract: A field element core has a perimeter exposed around a rotation axis and a plurality of field magnet insertion holes circularly disposed around the rotation axis P. A radius between the perimeter and the rotation axis P decreases in a monotonically non-increasing manner from a pole center toward an interpole and then increases in a monotonically non-decreasing manner in a region between the pole center and the interpole in a circumferential direction.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: December 3, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Keiji Aota, Yoshihito Sanga, Akio Yamagiwa
  • Patent number: 8569924
    Abstract: A rotating electric machine includes a case, a plurality of teeth, coils and insulating films. The teeth are circumferentially arranged around a predetermined axis forming a center of the teeth. Each tooth has a first end disposed radially at an opposite side thereof from the predetermined axis. The a back yoke has a circular outer periphery, and a cylindrical inner periphery connecting the first ends of the teeth. The outer periphery has a plurality of concave parts opening radially inwardly toward the teeth at positions overlapping with the teeth as viewed radially. A minimum distance measured from an exposure surface of each tooth to the concave part overlapping therewith is smaller than a radial width of the back yoke at a portion where the concave parts are not provided. The exposure surfaces extend radially inwardly of the inner periphery.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: October 29, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Yoshiki Yasuda, Akio Yamagiwa
  • Patent number: 8400039
    Abstract: An outer rotor motor comprises a rotor rotating about an axis, and a fixed stator. Provided over the inner peripheral surface of a cylindrical part of a fan connecting resin member are a ring-shaped yoke, a ring-shaped rotor magnet fixed to a fixing slot defined in the radially inner surface of the yoke, and yokes fixed to fixing slots defined in a radially inner surface of the rotor magnet. The rotor magnet is so magnetized that magnetic poles alternately change in a circumferential direction. The yoke covers a radially outer surface of the rotor magnet, and parts on a radially outer side of an axially upper surface and an axially lower surface of the rotor magnet.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: March 19, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Shintarou Araki, Akio Yamagiwa
  • Publication number: 20130026874
    Abstract: A motor includes a driving shaft, a rotor attached to the driving shaft, and a stator having a substantially cylindrical stator core provided around the rotor, and a plurality of coils wound around the stator core in a distributed winding manner The stator core includes three separated stator core parts aligned along a peripheral direction, and each of the coils is disposed so as not to lie astride any two of the three separated stator core parts. At least one coil end of the plurality of the coils is disposed to pass through an inner side relative to an inner peripheral surface of the stator core.
    Type: Application
    Filed: March 28, 2011
    Publication date: January 31, 2013
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Toshinari Kondou, Yoshiki Yasuda, Akio Yamagiwa
  • Publication number: 20120187877
    Abstract: A three-phase AC motor (4) has a configuration in which a q-axis inductance is larger than a d-axis inductance by a predetermined amount or more to allow smoothing of power fluctuations due to the power supply voltage of the AC power source (3).
    Type: Application
    Filed: September 29, 2010
    Publication date: July 26, 2012
    Inventors: Akio Yamagiwa, Toshinari Kondou, Toshihito Sanga
  • Publication number: 20120112593
    Abstract: A rotor includes a plurality of permanent magnets arranged annularly around an axis and a rotor core. The rotor core includes 2N (where N is a natural number) magnetic pole faces and a plurality of magnetic barriers. The 2N magnetic pole faces produce, due to the plurality of permanent magnets, magnetic poles in a radial direction in such a manner that different polarities can be alternately produced around the axis. The magnetic barriers are provided at a side close to the magnetic pole faces relative to the permanent magnets. At least one of the magnetic barriers is provided in each region obtained by equally dividing the rotor core into (2N+1), ((N+1)×2) or ((N?1)×2) angles around the axis.
    Type: Application
    Filed: July 9, 2010
    Publication date: May 10, 2012
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shintarou Araki, Akio Yamagiwa
  • Publication number: 20110062815
    Abstract: A field element core has a perimeter exposed around a rotation axis and a plurality of field magnet insertion holes circularly disposed around the rotation axis P. A radius between the perimeter and the rotation axis P decreases in a monotonically non-increasing manner from a pole center toward an interpole and then increases in a monotonically non-decreasing manner in a region between the pole center and the interpole in a circumferential direction.
    Type: Application
    Filed: April 22, 2009
    Publication date: March 17, 2011
    Inventors: Keiji Aota, Yoshihito Sanga, Akio Yamagiwa
  • Publication number: 20100314954
    Abstract: An outer rotor motor comprises a rotor rotating about an axis, and a fixed stator. Provided over the inner peripheral surface of a cylindrical part of a fan connecting resin member are a ring-shaped yoke, a ring-shaped rotor magnet fixed to a fixing slot defined in the radially inner surface of the yoke, and yokes fixed to fixing slots defined in a radially inner surface of the rotor magnet. The rotor magnet is so magnetized that magnetic poles alternately change in a circumferential direction. The yoke covers a radially outer surface of the rotor magnet, and parts on a radially outer side of an axially upper surface and an axially lower surface of the rotor magnet.
    Type: Application
    Filed: October 22, 2007
    Publication date: December 16, 2010
    Inventors: Shintarou Araki, Akio Yamagiwa
  • Patent number: 7777382
    Abstract: A motor includes a rotor core, permanent magnets and non-magnetic layers. The permanent magnets are embedded in the rotor core with each of the permanent magnets defining a pole of the rotor having a pole center and a peripheral edge section, with the peripheral edge section located in a vicinity between the poles and a vicinity of the rotor surface. The non-magnetic layers are located in a vicinity of the rotor surface at a pole center side position with respect to the peripheral edge section of each of the permanent magnets. The peripheral edge sections and the non-magnetic layers are positioned to cancel 5-th or 7-th order harmonics of an induction voltage. The poles are disposed at every approximately constant interval, varying in a constant angle. The peripheral edge sections and the non-magnetic layers are independent from one another, and the rotor core is interposed between them.
    Type: Grant
    Filed: April 23, 2009
    Date of Patent: August 17, 2010
    Assignee: Daikin Industries, Ltd.
    Inventors: Keiji Aota, Kiyotaka Nishijima, Akio Yamagiwa
  • Publication number: 20100135830
    Abstract: A rotating electric machine for a compressor includes a case, a plurality of teeth, coils and insulating films. The teeth are circumferentially arranged around a predetermined axis forming a center of the teeth. Each tooth has a first end disposed radially at an opposite side thereof from the predetermined axis. The a back yoke has a circular outer periphery, and a cylindrical inner periphery connecting the first ends of the teeth. The outer periphery has a plurality of concave parts opening radially inwardly toward the teeth at positions overlapping with the teeth as viewed radially. A minimum distance measured from an exposure surface of each tooth to the concave part overlapping therewith is smaller than a radial width of the back yoke at a portion where the concave parts are not provided. The exposure surfaces extend radially inwardly of the inner periphery.
    Type: Application
    Filed: April 23, 2008
    Publication date: June 3, 2010
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yoshiki Yasuda, Akio Yamagiwa
  • Publication number: 20100119378
    Abstract: A rotary compressor includes a compression mechanism, an electric motor and a controller. The compression mechanism includes a piston and a cylinder having two cylinder chambers. The electric motor is configured to change volumes of the cylinder chambers by eccentrically moving the cylinder and the piston relative to each other. The controller is configured to change an output torque of the electric motor in accordance with a variation in a load torque of the compression mechanism in one turn of rotation.
    Type: Application
    Filed: February 28, 2007
    Publication date: May 13, 2010
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yoshitaka Shibamoto, Takashi Shimizu, Masanori Masuda, Takazou Sotojima, Kazuhiro Furusho, Akio Yamagiwa, Yoshiki Yasuda
  • Patent number: 7608964
    Abstract: It is an object of the present invention to provide techniques for improving efficiency and torque of a motor while achieving thinning of the motor. In a brushless DC motor, a rotor includes a magnetic-field creating magnet and a stator includes an armature winding. The magnetic-field creating magnet and the armature winding are placed to locally face in a radial direction orthogonal to an axial direction. This reduces a thickness of the brushless DC motor which extends in the axial direction. Also, a short-circuit yoke plate for joining and magnetically short-circuiting the north pole and the south pole of a permanent magnet is placed on a negative side in the axial direction with respect to the magnetic-field creating magnet. By provision of the short-circuit yoke plate, a magnetic path on a negative side in the axial direction with respect to the magnetic-field creating magnet can be shortened.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: October 27, 2009
    Assignee: Daikin Industries, Ltd.
    Inventor: Akio Yamagiwa
  • Patent number: 7579733
    Abstract: A motor has a rotor core with a plurality of first non-magnetic layers and a plurality of second non-magnetic layers. The rotor core has a plurality of magnets. The first and second non-magnetic layers are positioned to cancel n-th order harmonics. Therefore, a specific order, for example 5-th order and 7-th order, harmonics component of a magnetic flux distribution waveform (induction voltage waveform) is reduced and unnecessary radial force and thrust force is prevented from occurrence, while sufficient magnetic flux is maintained.
    Type: Grant
    Filed: July 5, 2004
    Date of Patent: August 25, 2009
    Assignee: Daikin Industries, Ltd.
    Inventors: Keiji Aota, Kiyotaka Nishijima, Akio Yamagiwa