Patents by Inventor Youichi Syukuri

Youichi Syukuri 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).

  • Rotor magnetic pole position detection device
    Patent number: 6218795
    Abstract: A rotor magnetic pole position detection device detects a zero-cross point in a induced voltage induced in a stationary winding under a PWM control, and is used in a DC brushless motor drive control apparatus to be driven in a sensorless mode. A detection circuit detects terminal voltages of a plurality of stationary windings. A reference voltage generation circuit generates a reference voltage. A comparison unit compares the terminal voltages with the reference voltage. A speed command voltage generation unit generates a PWM ON-width control signal. A PWM control signal generation unit generates a PWM control signal which has a duty ratio corresponding to the PWM ON-width control signal. A logical operating unit obtains a phase signal from an output signal of the comparison unit, and outputs an energization timing signal based on the phase signal and the PWM control signal. A driver circuit energizes the stationary windings based on the energization timing signal.
    Type: Grant
    Filed: December 16, 1999
    Date of Patent: April 17, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Youichi Syukuri
  • Pump for circulating coolant in electronic devices
    Patent number: D482370
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: November 18, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kyo Niwatsukino, Youichi Syukuri, Seiji Urano, Shigeru Narakino, Fuminori Hirakawa, Toshihiko Matsuda, Shinya Koga, Yoshimitsu Aizono, Toshisuke Sakai, Toshiyuki Kubota
  • Pump for circulating coolant in electronic devices
    Patent number: D482698
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: November 25, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kyo Niwatsukino, Youichi Syukuri, Seiji Urano, Shigeru Narakino, Fuminori Hirakawa, Toshihiko Matsuda, Shinya Koga, Yoshimitsu Aizono, Toshisuke Sakai, Toshiyuki Kubota, Makoto Nishida
  • Pump for circulating coolant in electronic devices
    Patent number: D483041
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: December 2, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kyo Niwatsukino, Youichi Syukuri, Seiji Urano, Shigeru Narakino, Fuminori Hirakawa, Toshihiko Matsuda, Shinya Koga, Yoshimitsu Aizono, Toshisuke Sakai, Toshiyuki Kubota, Makoto Nishida
  • Pump for circulating coolant in electronic devices
    Patent number: D492325
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: June 29, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kyo Niwatsukino, Youichi Syukuri, Seiji Urano, Shigeru Narakino, Fuminori Hirakawa, Toshihiko Matsuda, Shinya Koga, Yoshimitsu Aizono, Toshisuke Sakai, Toshiyuki Kubota, Makoto Nishida