Patents by Inventor Yu HIROTANI

Yu HIROTANI 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).

  • Publication number: 20210075273
    Abstract: A stator includes a core back portion, a plurality of teeth extending inward in a radial direction of the stator from the core back portion, a first system coil portion and a second system coil portion wound on each of the teeth, and a magnetic interference reduction member provided between the first system coil portion and the second system coil portion to reduce magnetic interference between the first system coil portion and the second system coil portion. Further, the first system coil portion and the second system coil portion are connected to mutually different power supply sources, that is, the first system coil portion and the second system coil portion are each connected to a first system power supply source or a second system power supply source.
    Type: Application
    Filed: March 20, 2019
    Publication date: March 11, 2021
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroko IKEDA, Shinichi YAMAGUCHI, Yuji TAKIZAWA, Yu HIROTANI, Kazumasa ITO
  • Publication number: 20210075305
    Abstract: A permanent magnet motor includes a rotor having a field pole of a rotor core, wherein the field pole has a radius smaller than an arc centered on a shaft of the rotor, a multiple of slits are formed in the field pole, the multiple of slits are disposed so that an interval between a first central line positioned between a multiple of the slits and a second central line positioned between a neighboring multiple of the slits increases as the first central line and the second central line head toward an outer peripheral side of the rotor core, and of the multiple of slits of the field pole, a first slit disposed in a central position of the field pole, and a second slit and a third slit disposed on either side of the first slit, are disposed within 20% of a circumferential direction width of the permanent magnet.
    Type: Application
    Filed: February 28, 2018
    Publication date: March 11, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuji TAKIZAWA, Hiroko IKEDA, Shinichi YAMAGUCHI, Yu HIROTANI, Masafumi OKAZAKI, Satoru AKUTSU
  • Patent number: 10944347
    Abstract: Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: March 9, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takizawa, Yu Hirotani, Masafumi Okazaki, Satoru Akutsu
  • Patent number: 10910892
    Abstract: In the rotary electric machine according to the present invention, a plurality of core sheets include linked core sheets that include linking portions that protrude circumferentially from flange portions so as to link together tip portions of adjacent tooth portions, at least one sheet of the linked core sheets is formed such that a tooth tip portion shape is mirror-asymmetrical relative to a tooth central axis that passes through a circumferential center of the tooth portions, and a stator core is configured by laminating the linked core sheets such that circumferential positions of the linking portions are offset.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: February 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yu Hirotani, Kazumasa Ito, Yuji Takizawa, Satoru Akutsu, Hiroshi Aida, Shusuke Hori
  • Patent number: 10903769
    Abstract: Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: January 26, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takizawa, Yu Hirotani, Masafumi Okazaki, Satoru Akutsu
  • Patent number: 10903724
    Abstract: The present invention provides a rotation angle detector capable of detecting a rotation angle of a rotor in the same manner as at normal time even when abnormality such as disconnection or a short circuit occurs, and capable of reducing the number of terminals. When one spatial order cycle of the output winding is an electrical angle of 360°, a phase difference between a first output winding and a second output winding and a phase difference between the second output winding and a third output winding are set at an electrical angle ?, and ??180°×n (n is an integer).
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: January 26, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroko Ikeda, Yusuke Morita, Kazumasa Ito, Yu Hirotani, Kodai Okazaki, Satoru Akutsu, Yuji Takizawa
  • Patent number: 10855121
    Abstract: Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: December 1, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yu Hirotani, Kazumasa Ito, Hiroko Ikeda, Kodai Okazaki, Shinichi Yamaguchi
  • Patent number: 10833549
    Abstract: In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of ?k that satisfies ?1<?k?m are different than the numbers of turns of conducting wire in the ?1 and ?m coil portions, and are also different than the numbers of turns of conducting wire in the coil portions that are adjacent to the ?k coil portions on two sides in a circumferential direction of the stator core, and phases of the ?k coil portions are also different than phases of each of the coil portions that are adjacent to the ?k coil portions on the two sides in the circumferential direction.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: November 10, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kodai Okazaki, Masatsugu Nakano, Kazumasa Ito, Yu Hirotani, Hiroko Ikeda, Koji Kawamura
  • Patent number: 10608504
    Abstract: A rotary electric machine including a stator and a rotor. The stator includes a stator core and an armature winding. The rotor includes a rotor core and a plurality of permanent magnets. The rotor core is disposed on the periphery of a shaft such that a magnetic gap is formed between the rotor core and the stator. The plurality of permanent magnets project in a rotary axis direction from an end face of the rotor core. The rotary electric machine further includes a plurality of magnet holding portions provided respectively on parts of the plurality of permanent magnets that project from the end face of the rotor core. Spaces are provided between the plurality of magnet holding portions.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: March 31, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Kise, Yu Hirotani
  • Patent number: 10574125
    Abstract: A multiplex multiphase winding AC motor includes an armature iron core provided with a plurality of teeth and a plurality of slots, an armature winding provided with two or more groups of multiphase windings that are wound around the teeth and are contained in the slots, a plurality of motor driving apparatuses independently connected with the two or more groups of multiphase windings, and a magnetic-field-pole iron core provided with a plurality of magnetic-field poles arranged in such a way as to face the armature iron core through a gap; in the magnetic-field-pole iron core, a plurality of magnetic resistance elements for impeding a magnetic-flux flow in the circumferential direction thereof are formed.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: February 25, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yu Hirotani, Yuji Takizawa, Masatsugu Nakano, Satoru Akutsu, Toyoaki Udo
  • Publication number: 20190363663
    Abstract: In the present electric driving apparatus, coils that constitute a first armature winding and coils that constitute a second armature winding are arranged so as to alternate in a circumferential direction, and a control portion is configured so as to perform single-system driving when one of a first system and a second system fails, the single-system driving stopping driving of an inverter of the system that has failed, and controlling driving of the inverter of the system that has not failed to supply inverter phase currents to an armature winding of the system that has not failed such that the inverter phase currents are set to a second upper limit value that is greater than a first upper limit value.
    Type: Application
    Filed: January 26, 2017
    Publication date: November 28, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yu HIROTANI, Kazumasa ITO, Yusuke MORITA, Yuji TAKIZAWA, Satoru AKUTSU, Masafumi OKAZAKI
  • Publication number: 20190363659
    Abstract: Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.
    Type: Application
    Filed: February 16, 2017
    Publication date: November 28, 2019
    Applicant: Mitsubishi Electronic Corporation
    Inventors: Yuji TAKIZAWA, Yu HIROTANI, Masafumi OKAZAKI, Satoru AKUTSU
  • Patent number: 10418866
    Abstract: A multiple-polyphase AC dynamo-electric machine, wherein each of the plurality of the teeth provides the flange part to the NS magnetic pole part of the rotor side end part, the stator core has a magnetic connection part which connects the flange parts adjoined each other in the NS magnetic pole of each of the plurality of teeth, the connection part is provided corresponding to each of the slot and an inner peripheral side of the corresponding slot, the radial width of the connection part are smaller than both of the circumferential width of the teeth, thereby the radial widths of the connecting sections are smaller than both the circumferential widths of the teeth and the radial widths of the flanges, voltages generated when the magnetic flux generated by current flowing through one group of windings links with the windings in another group are suppressed effectively.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: September 17, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yu Hirotani, Yuji Takizawa, Sachiko Kawasaki, Masatsugu Nakano, Toyoaki Udo, Satoru Akutsu
  • Patent number: 10404124
    Abstract: A rotary electric machine includes: a rotor; and a stator including: a stator core; and an armature winding that is mounted to the stator core. The armature winding includes by a plurality of identical-phase winding portions in which identical-phase coil portions among coil portions in which conducting wires are wound in concentration onto respective teeth are connected together into a series circuit by crossover wires, and that also have lead wires at two end portions. Each of the lead wires of each of the identical-phase winding portions is led out in a first axial direction of the rotor from coil portions that have identical phase, that are disposed to be adjacent in a circumferential direction of the stator core; and all of the crossover wires of each of the identical-phase winding portions are led out in a second axial direction of the rotor.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: September 3, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroko Ikeda, Yu Hirotani, Masatsugu Nakano, Kazumasa Ito, Kodai Okazaki, Koji Kawamura
  • Patent number: 10396612
    Abstract: In a permanent magnet type concentrated winding motor, the number of magnetic poles is M, a stator Sr has an N number of teeth T around which coils are concentratedly wound and which are circumferentially arranged at equal intervals, M is equal to (18±4)n and N is equal to 18n, an armature winding AW has an m number of parallel circuits, and a 1-phase circuit of the parallel circuits is configured to have a 6n/m number of coils connected in series with each other.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: August 27, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masatsugu Nakano, Satoru Akutsu, Yoshihito Asao, Yuji Takizawa, Yu Hirotani, Ryuichi Takiguchi
  • Patent number: 10374474
    Abstract: It has been discovered that torque ripples can be reduced by adopting a shape in which: the width of a shoe connection formed in a stator of a permanent magnet motor is equal to or smaller than the thickness of each of core pieces constituting a stator core; and a relationship of 0.7?Wm/(Tm×Gm)?3.3 is satisfied, where Wm is the length of the long side of a flat plate-shaped permanent magnet embedded in a rotor, Tm is the length of the short side of the permanent magnet, and Gm is the maximum distance from the outer circumference of the rotor to the permanent magnet.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: August 6, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takizawa, Satoru Akutsu, Masafumi Okazaki, Hiroshi Aida, Yu Hirotani, Kazumasa Ito
  • Patent number: 10320254
    Abstract: A permanent magnet motor is provided in which, in flanges each provided in a plurality of teeth, lateral side portions of the flanges oppose to lateral side portions the flanges being provided in adjacent teeth and protruding in a circumferential direction of a stator core; when a height in the lateral side portion of the flanges in a radial direction of the stator core is defined as “h,” and the length of a magnetic air gap is defined as “g,” the relationship “1?h/g?2” is held; and also, when a circumferential distance between opposing faces of the flanges being adjacent to each other is defined as “a,” the relationship “a/g?0.2” is satisfied.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: June 11, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masatsugu Nakano, Yu Hirotani, Yuji Takizawa, Satoru Akutsu, Toyoaki Udo
  • Publication number: 20190097474
    Abstract: Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.
    Type: Application
    Filed: December 26, 2016
    Publication date: March 28, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yu HIROTANI, Kazumasa ITO, Hiroko IKEDA, Kodai OKAZAKI, Shinichi YAMAGUCHI
  • Patent number: 10236750
    Abstract: A rotating electric machine with a built-in control device that can be downsized. The rotating electric machine with a built-in control device includes a rotor including a permanent magnet of sensor use provided on a rear side of a rotor shaft, a front side housing fixed with a first bearing supporting a front side of the rotor shaft, a motor frame including a rotor and a stator, a heat sink fixed with a second bearing supporting the rear side of the rotor shaft, a control substrate mounting a rotary sensor, a microcomputer, and a driving circuit. The microcomputer controls the driving circuit based on signals from the rotary sensor and drives a plurality of switching elements. At least one of a smoothing condenser and a noise reduction coil, connected to the switching elements, is arranged at a far rear side of the control substrate.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: March 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yu Hirotani, Masatsugu Nakano, Hiroyuki Waku, Hiroyuki Akita, Koji Kise, Hiroyasu Iwabuki, Kosuke Nakano
  • Publication number: 20190058383
    Abstract: Each of a plurality of permanent-magnet pairs is configured with a pair of permanent magnets that are arranged in a v-shaped manner in such a way that the distance between the portions of the permanent magnets, facing each other at the outer side in the radial direction of the rotor core, is smaller than the distance between the portions thereof, facing each other at the inner side in the radial direction of the rotor core; a magnetic-field pole is formed of part, of the rotor core, that is situated between the adjacent permanent-magnet pairs.
    Type: Application
    Filed: May 10, 2016
    Publication date: February 21, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuji TAKIZAWA, Yu HIROTANI