Patents by Inventor Ayumu Yamada

Ayumu Yamada 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).

  • Armature coil and armature
    Patent number: 11398758
    Abstract: A strand of a unit coil of an armature coil is transposed by transposition angle 540 degrees in a slot and transposed by a first transposition angle at coil end portions. In the slot, the strand has a change portion in which the change rate of transposition of the strand is changed. An axial-direction middle point of the change portion is located between a position at transposition angle 90 degrees and a position obtained by adding the first transposition angle of the strand to transposition angle 90 degrees.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: July 26, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryoji Miyatake, Ayumu Yamada, Haruyuki Kometani
  • ARMATURE COIL AND ARMATURE
    Publication number: 20210249923
    Abstract: A strand of a unit coil of an armature coil is transposed by transposition angle 540 degrees in a slot and transposed by a first transposition angle at coil end portions. In the slot, the strand has a change portion in which the change rate of transposition of the strand is changed. An axial-direction middle point of the change portion is located between a position at transposition angle 90 degrees and a position obtained by adding the first transposition angle of the strand to transposition angle 90 degrees.
    Type: Application
    Filed: July 24, 2018
    Publication date: August 12, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Ryoji MIYATAKE, Ayumu YAMADA, Haruyuki KOMETANI
  • Brushless synchronous power generation apparatus
    Patent number: 10734931
    Abstract: As a configuration of carrying out a turning operation of a brushless synchronous power generation apparatus, there are provided a synchronous generator, an AC exciter, a rotary rectifier attached to an armature of the AC exciter, and short-circuiting means which three-phase short-circuits armature windings of the AC exciter, wherein the armature windings of the AC exciter are short-circuited, causing the AC exciter to operate as an induction motor, thus rotating the rotor shaft of the synchronous generator.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: August 4, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryoji Miyatake, Ayumu Yamada, Keisuke Yoshida
  • BRUSHLESS SYNCHRONOUS POWER GENERATION APPARATUS
    Publication number: 20190245466
    Abstract: As a configuration of carrying out a turning operation of a brushless synchronous power generation apparatus, there are provided a synchronous generator, an AC exciter, a rotary rectifier attached to an armature of the AC exciter, and short-circuiting means which three-phase short-circuits armature windings of the AC exciter, wherein the armature windings of the AC exciter are short-circuited, causing the AC exciter to operate as an induction motor, thus rotating the rotor shaft of the synchronous generator.
    Type: Application
    Filed: August 23, 2016
    Publication date: August 8, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Ryoji Miyatake, Ayumu Yamada, Keisuke Yoshida