Patents by Inventor Toyoshi Onitsuka

Toyoshi Onitsuka 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).

  • Electric motor controller resonance frequency detection apparatus
    Patent number: 6903530
    Abstract: A resonance frequency detector for an electric motor controller in which a resonance frequency can be measured at high speed by a simple calculation and the resonance frequency can be detected by an inexpensive computer is provided. In an electric motor control system including an electric motor (3) for driving a machine, a detecting unit (5) for detecting an amount of operation of the machine (3) and a controller (2) for receiving a control command to drive the electric motor (3), a command generator (1) generates a sweep sine wave signal to input the signal to the electric motor control system, and the frequency information of the sweep sine wave signal outputted by the command generator (1) and the signal of the detecting unit (5) are inputted to output the frequency of the sweep sine wave signal when the absolute value of the signal of the detecting unit (5) becomes maximum as a resonance frequency.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: June 7, 2005
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takehiko Komiya, Toyoshi Onitsuka, Kazuhiro Hamasuna
  • Electric motor controller resonance frequency detection apparatus
    Publication number: 20040239279
    Abstract: A resonance frequency detector for an electric motor controller in which a resonance frequency can be measured at high speed by a simple calculation and the resonance frequency can be detected by an inexpensive computer is provided.
    Type: Application
    Filed: February 17, 2004
    Publication date: December 2, 2004
    Inventors: Takehiko Komiya, Toyoshi Onitsuka, Kazuhiro Hamasuna