Patents by Inventor Randall K. Ushiyama

Randall K. Ushiyama 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).

  • Arrangement using sensed magnetic flux for rate damping and vibration suppression
    Patent number: 5453675
    Abstract: Flux information in a magnetic circuit such as may be used for rate damping and vibration suppression in a magnetic forcer system is sensed and is used in conjunction with a differentiated forcer position signal to provide a rate damping signal. The sensed magnetic flux is used to synthesize an inertial velocity signal which is applied as a position rate damping input to a closed position control loop.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: September 26, 1995
    Inventors: Randall K. Ushiyama, Eric C. Mathisen, Michael K. Scruggs, Eric Hahn
  • Passive tuned magnetic flux rate feedback sensing and control arrangement
    Patent number: 5420741
    Abstract: An arrangement for obtaining flux rate information in a magnetic: circuit including passive means connected across a flux rate sensor for implementing control of said flux rate. The passive means being a tuned magnetic flux rate feedback sensing and control arrangement wherein impedance is tuned and the energy loss characteristic is adjustable. The selection of inductance and capacitance values provides tuning and the selection of resistance affects the energy loss characteristics.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: May 30, 1995
    Assignee: Allied-Signal Inc.
    Inventors: Randall K. Ushiyama, Michael K. Scruggs, Eric C. Mathisen, Eric Hahn
  • Active tuned magnetic flux rate feedback sensing arrangement
    Patent number: 5394290
    Abstract: An arrangement using sensing coils for obtaining flux rate of change information in a magnetic circuit. The arrangement can be used for vibration attenuation in a magnetic forcer system. Active (electric powered) circuitry is used to implement closed loop control of flux rate. The control loop is "tuned" for attenuating a narrow range of vibration frequencies. The arrangement can be applied to magnetic forcer/suspension systems in which vibrations due to magnetic, mechanical/magnetic runouts, system mechanical resonances, or external vibration sources are present.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: February 28, 1995
    Assignee: AlliedSignal Inc.
    Inventors: Randall K. Ushiyama, Michael K. Scruggs, Eric C. Mathisen, Eric Hahn
  • Active broadband magnetic flux rate feedback sensing arrangement
    Patent number: 5329416
    Abstract: An arrangement using sensing coils for obtaining flux rate of change information in a magnetic circuit. The arrangement can be used for vibration attenuation in a magnetic forcer system. Active (electric powered) circuitry is used to implement closed loop control of flux rate. The control loop is "broadband" since a broad range of vibration frequencies are attenuated. The arrangement can be applied to magnetic forcer/suspension systems in which vibrations due to magnetic mechanical/magnetic runouts, system mechanical resonances, or external vibration sources are present. The arrangement is particularly applicable for systems with a large number of varying vibration frequencies.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: July 12, 1994
    Assignee: AlliedSignal Inc.
    Inventors: Randall K. Ushiyama, Michael K. Scruggs, Eric C. Mathisen, Eric Hahn
  • Fuzzy switching logic for servo systems
    Patent number: 5289095
    Abstract: An actuator'rate is controlled by a rate servo and the actuator's position is controlled by a position control. The position control can be a position servo or a mechanical brake. Selection of either the rate servo or position control is made by fuzzy switching logic.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: February 22, 1994
    Assignee: AlliedSignal Inc
    Inventor: Randall K. Ushiyama