Patents by Inventor Steven D. Pekarek

Steven D. Pekarek 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).

  • System and method of measuring quasi-static force with a piezoelectric sensor
    Patent number: 8789426
    Abstract: A system and method employing a piezoelectric sensor for quasi-static force measurement substantially free of drift and with improved low-frequency response. The output signal from the sensor is sampled and integrated using digital techniques that include a drift compensation algorithm. The algorithm continually monitors the sensor output and estimates bias errors that will cause the output to drift.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: July 29, 2014
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Kevin A. Rosenbaum
  • Torque ripple mitigation controller with vibration sensor delay compensation
    Patent number: 8018193
    Abstract: An enhanced torque ripple mitigation algorithm for permanent magnet synchronous machines (PMSMs), the algorithm including compensation for sensor delay.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: September 13, 2011
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Philip B. Beccue
  • System and method of measuring quasi-static force with a piezoelectric sensor
    Patent number: 7997144
    Abstract: A system and method employing a piezoelectric sensor for quasi-static force measurement substantially free of drift and with improved low-frequency response. The output signal from the sensor is sampled and integrated using digital techniques that include a drift compensation algorithm. The algorithm continually monitors the sensor output and estimates bias errors that will cause the output to drift.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: August 16, 2011
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Kevin A. Rosenbaum
  • Rotor position sensing apparatus and method using piezoelectric sensor and hall-effect sensor
    Patent number: 7885785
    Abstract: A position observer for control-based torque ripple mitigation in permanent magnet synchronous machines (PMSMs). Rotor position is determined using data from two sources: a piezoelectric sensor for initial position and low-speed detection, and a single Hall-effect sensor for high-speed detection.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: February 8, 2011
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Philip B. Beccue
  • Torque ripple sensor and mitigation mechanism
    Patent number: 7117754
    Abstract: A torque ripple sensor and method for torque ripple sensing and/or mitigation. A piezoelectric sensor is positioned relative to a motor so that torque fluctuations due to torque ripple of the motor are transmitted to the sensor, resulting in strain of a piezoelectric element. A resulting signal can be amplified and conditioned for determining a magnitude of the torque ripple and/or fed into a feedback loop for applying current control or a counter-torque to the motor for torque ripple mitigation.
    Type: Grant
    Filed: October 28, 2002
    Date of Patent: October 10, 2006
    Assignee: The Curators of the University of Missouri
    Inventors: Jason Neely, Steven D. Pekarek, Jason M. Banaskavich, Daniel S. Stutts
  • Torque ripple sensor and mitigation mechanism
    Publication number: 20040079173
    Abstract: A torque ripple sensor and method for torque ripple sensing and/or mitigation. A piezoelectric sensor is positioned relative to a motor so that torque fluctuations due to torque ripple of the motor are transmitted to the sensor, resulting in strain of a piezoelectric element. A resulting signal can be amplified and conditioned for determining a magnitude of the torque ripple and/or fed into a feedback loop for applying current control or a counter-torque to the motor for torque ripple mitigation.
    Type: Application
    Filed: October 28, 2002
    Publication date: April 29, 2004
    Applicant: The Curators of the University of Missouri
    Inventors: Jason Neely, Steven D. Pekarek, Jason M. Banaskavich, Daniel S. Stutts