Patents by Inventor Genki FUJII

Genki FUJII 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: 11936309
    Abstract: A permanent-magnet-synchronous electric motor control device includes: a reference voltage value calculation unit for calculating a reference voltage value; an output voltage value calculation unit for calculating an output voltage value on the basis of a voltage command; a current weakening command calculation unit for calculating a current weakening command on the basis of the reference voltage value and the output voltage value; a voltage command calculation unit for calculating the voltage command on the basis of the current weakening command; and a power converter for supplying power to a permanent-magnet-synchronous electric motor on the basis of the voltage command. The current weakening command calculation unit calculates the current weakening command in which a high-frequency component is amplified on the basis of the difference between the reference voltage value and the output voltage value.
    Type: Grant
    Filed: May 22, 2020
    Date of Patent: March 19, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuya Tsuchimoto, Tatsuya Mori, Akira Furukawa, Isao Kezobo, Genki Fujii
  • Patent number: 11837979
    Abstract: An electric motor control device, capable of suppressing a torque ripple even when electrical characteristics on a motor have errors or variations, comprises: a fundamental electric-current instruction generator for outputting d-axis and q-axis fundamental electric-current instructions for outputting fundamental torque from the motor having saliency; a position dependency component generator for outputting a position dependency component(s) of the motor according to its rotational position; an electric current correction instruction calculator for calculating d-axis and q-axis current correction instructions from the d-axis and q-axis fundamental electric-current instructions, and the position dependency component(s); an electric current correction instruction superposition unit for generating d-axis and q-axis current instructions by performing superposition of the d-axis and q-axis current correction instructions on the d-axis and q-axis fundamental electric-current instructions; and an electric current con
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: December 5, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masahiko Orii, Isao Kezobo, Tatsuya Mori, Genki Fujii
  • Patent number: 11784595
    Abstract: To provide a controller for AC rotary electric machine and an electric power steering apparatus which can superimposes a cancellation current for canceling the torque ripple component on the winding current in feedforward manner and cancel the torque ripple component. A controller for AC rotary electric machine calculates an oscillation voltage command value of q-axis which has the same frequency as the torque ripple component; calculates a reverse phase of the torque ripple component based on the current information and the magnetic pole position; calculates a correction phase corresponding to the phase delay of the actual current with respect to the oscillation voltage command value of q-axis; and sets a phase of the oscillation voltage command value of q-axis to a phase obtained by advancing the reverse phase of the torque ripple component by the correction phase.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: October 10, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Masahiko Orii, Genki Fujii, Yu Hirotani
  • Publication number: 20230097479
    Abstract: A permanent-magnet-synchronous electric motor control device includes: a reference voltage value calculation unit for calculating a reference voltage value; an output voltage value calculation unit for calculating an output voltage value on the basis of a voltage command; a current weakening command calculation unit for calculating a current weakening command on the basis of the reference voltage value and the output voltage value; a voltage command calculation unit for calculating the voltage command on the basis of the current weakening command; and a power converter for supplying power to a permanent-magnet-synchronous electric motor on the basis of the voltage command. The current weakening command calculation unit calculates the current weakening command in which a high-frequency component is amplified on the basis of the difference between the reference voltage value and the output voltage value.
    Type: Application
    Filed: May 22, 2020
    Publication date: March 30, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuya TSUCHIMOTO, Tatsuya MORI, Akira FURUKAWA, Isao KEZOBO, Genki FUJII
  • Publication number: 20220224266
    Abstract: To provide a controller for AC rotary electric machine and an electric power steering apparatus which can superimposes a cancellation current for canceling the torque ripple component on the winding current in feedforward manner and cancel the torque ripple component. A controller for AC rotary electric machine calculates an oscillation voltage command value of q-axis which has the same frequency as the torque ripple component; calculates a reverse phase of the torque ripple component based on the current information and the magnetic pole position; calculates a correction phase corresponding to the phase delay of the actual current with respect to the oscillation voltage command value of q-axis; and sets a phase of the oscillation voltage command value of q-axis to a phase obtained by advancing the reverse phase of the torque ripple component by the correction phase.
    Type: Application
    Filed: July 30, 2019
    Publication date: July 14, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya MORI, Masahiko ORII, Genki FUJII, Yu HIROTANI
  • Publication number: 20220181998
    Abstract: An electric motor control device, capable of suppressing a torque ripple even when electrical characteristics on a motor have errors or variations, comprises: a fundamental electric-current instruction generator for outputting d-axis and q-axis fundamental electric-current instructions for outputting fundamental torque from the motor having saliency; a position dependency component generator for outputting a position dependency component(s) of the motor according to its rotational position; an electric current correction instruction calculator for calculating d-axis and q-axis current correction instructions from the d-axis and q-axis fundamental electric-current instructions, and the position dependency component(s); an electric current correction instruction superposition unit for generating d-axis and q-axis current instructions by performing superposition of the d-axis and q-axis current correction instructions on the d-axis and q-axis fundamental electric-current instructions; and an electric current con
    Type: Application
    Filed: June 27, 2019
    Publication date: June 9, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masahiko ORII, Isao KEZOBO, Tatsuya MORI, Genki FUJII
  • Publication number: 20220073129
    Abstract: An angle detector including; a magnet being mounted on a rotation axle and that has a first track magnetized in P pole-pairs and second track magnetized in Q pole-pairs, a first hole device group that senses magnetic flux from the first track, a second hole device group that senses magnetic flux from the second track, a first detection unit that outputs an M-step absolute angular signal through division of one electric-angle rotation into M sections, a second detection unit that outputs an N-step relative angular signal through division of each of the M divided sections into N sections, an angle calculation unit that divides the one electric-angle rotation into [M×N] sections and calculates an [M×N]-step electric angular signal, based on the absolute angular signal and the relative angular signal, and an angle correction unit that outputs a correction angle supplemented so as to smooth the electric angular signal.
    Type: Application
    Filed: July 9, 2019
    Publication date: March 10, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuya TSUCHIMOTO, Tatsuya MORI, Isao KEZOBO, Satoru AKUTSU, Isao SONODA, Genki FUJII
  • Patent number: D1042727
    Type: Grant
    Filed: March 11, 2022
    Date of Patent: September 17, 2024
    Assignee: GLOBERIDE, INC.
    Inventors: Yusuke Hirota, Wataru Tsutsumi, Genki Tode, Masayoshi Fujii, Masakazu Noguchi, Kentaro Ookuma, Takashi Kondo