Patents by Inventor Yasunobu Harada

Yasunobu Harada 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).

  • Motor control device
    Patent number: 7511448
    Abstract: In a motor control device according to the invention, upon velocity control of a motor, a superimposed signal generating unit 9 outputs a superimposed signal idh of a repetitive waveform, such as a triangular wave or a sine wave. A d-axis current command generating unit 10 adds the superimposed signal idh generated by the superimposed signal generating unit 9d to a d-axis current command idc*0 and outputs a d-axis current command idc*. An axial misalignment detecting unit 11 (11a, 11b, 11c, and 11d) receives the d-axis current command idc* and a q-axis current command iqc* and outputs an axial misalignment angle estimation value ??^. An axial misalignment correction unit 12 receives the axial misalignment angle estimation value ??^ and an actual detected position ?m and outputs a position after correction ?m?. Therefore, detection and correction can be performed in real time through calculation at a given timing during a normal operation.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: March 31, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kei Terada, Tetsuaki Nagano, Yasunobu Harada, Kazutaka Takahashi
  • Motor Control Device
    Publication number: 20080309265
    Abstract: In a motor control device according to the invention, upon velocity control of a motor, a superimposed signal generating unit 9 outputs a superimposed signal idh of a repetitive waveform, such as a triangular wave or a sine wave. A d-axis current command generating unit 10 adds the superimposed signal idh generated by the superimposed signal generating unit 9d to a d-axis current command idc*0 and outputs a d-axis current command idc*. An axial misalignment detecting unit 11 (11a, 11b, 11c, and 11d) receives the d-axis current command idc* and a q-axis current command iqc* and outputs an axial misalignment angle estimation value ???. An axial misalignment correction unit 12 receives the axial misalignment angle estimation value ??? and an actual detected position ?m and outputs a position after correction ?m?. Therefore, detection and correction can be performed in real time through calculation at a given timing during a normal operation.
    Type: Application
    Filed: January 7, 2004
    Publication date: December 18, 2008
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kei Terada, Tetsuaki Nagano, Yasunobu Harada, Kazutaka Takahashi
  • Magnetic-pole detecting system for synchronous AC motor and magnetic-pole detecting method therefor
    Patent number: 7323840
    Abstract: A magnetic-pole detecting system for synchronous AC motors and a magnetic-pole detecting method therefor are provided.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: January 29, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazutaka Takahashi, Yasunobu Harada
  • Device for detecting magnetic pole of synchronous ac motor, and magnetic pole detecting method therefor
    Publication number: 20050052175
    Abstract: A magnetic-pole detecting system for synchronous AC motors and a magnetic-pole detecting method therefor are provided.
    Type: Application
    Filed: February 7, 2002
    Publication date: March 10, 2005
    Inventors: Kazutaka Takahashi, Yasunobu Harada