Patents by Inventor Yuriko TAKEDA

Yuriko TAKEDA 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).

  • Speed estimating device for AC motor, driving device for AC motor, refrigerant compressor, and refrigeration cycle apparatus
    Patent number: 11632067
    Abstract: A speed estimating device for an AC motor includes: a model deviation computing unit computing a model deviation based on a voltage, a current, and an estimated angular velocity of the AC motor; a first angular velocity estimating unit computing a first estimated angular velocity based on the model deviation; a second angular velocity estimating unit computing a second estimated angular velocity differing from the first estimated angular velocity in frequency, based on the model deviation; a compensation phase computing unit computing a compensation phase based on a disturbance frequency; and an estimated angular velocity calculator computing an estimated angular velocity of the AC motor based on the first estimated angular velocity and the second estimated angular velocity. Either one of the first estimated angular velocity and the second estimated angular velocity is computed based on the compensation phase.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: April 18, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuriko Takeda, Kenji Takahashi, Shinya Toyodome, Mitsuo Kashima, Tomohiro Kutsuki
  • SPEED ESTIMATING DEVICE FOR AC MOTOR, DRIVING DEVICE FOR AC MOTOR, REFRIGERANT COMPRESSOR, AND REFRIGERATION CYCLE APPARATUS
    Publication number: 20220149764
    Abstract: A speed estimating device for an AC motor includes: a model deviation computing unit computing a model deviation based on a voltage, a current, and an estimated angular velocity of the AC motor; a first angular velocity estimating unit computing a first estimated angular velocity based on the model deviation; a second angular velocity estimating unit computing a second estimated angular velocity differing from the first estimated angular velocity in frequency, based on the model deviation; a compensation phase computing unit computing a compensation phase based on a disturbance frequency; and an estimated angular velocity calculator computing an estimated angular velocity of the AC motor based on the first estimated angular velocity and the second estimated angular velocity. Either one of the first estimated angular velocity and the second estimated angular velocity is computed based on the compensation phase.
    Type: Application
    Filed: March 22, 2019
    Publication date: May 12, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuriko TAKEDA, Kenji TAKAHASHI, Shinya TOYODOME, Mitsuo KASHIMA, Tomohiro KUTSUKI