Patents by Inventor Joshua Michael Williams

Joshua Michael Williams 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).

  • Power converter current sensor testing method
    Patent number: 7994798
    Abstract: A method of testing power converter current sensors is disclosed. The method may include receiving a current sensor test request and receiving measured currents from current measurements from the at least one current sensor, based on the test request. The method may further include comparing the measured current of the sensor with a stored profile and determining whether a fault exists in each current sensor being tested. The method may also include providing a user with a test report.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: August 9, 2011
    Assignee: Caterpillar Inc.
    Inventors: Joshua Michael Williams, Benjamin Paul Gottemoller, Robert Lindsey, Mark Edward Hartman
  • Power converter current sensor testing method
    Publication number: 20090140745
    Abstract: A method of testing power converter current sensors is disclosed. The method may include receiving a current sensor test request and receiving measured currents from current measurements from the at least one current sensor, based on the test request. The method may further include comparing the measured current of the sensor with a stored profile and determining whether a fault exists in each current sensor being tested. The method may also include providing a user with a test report.
    Type: Application
    Filed: November 30, 2007
    Publication date: June 4, 2009
    Inventors: Joshua Michael Williams, Benjamin Paul Gottemoller, Robert Lindsey, Mark Edward Hartman
  • Electric motor system implementing vector and slip control
    Patent number: 7511449
    Abstract: A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter operationally connected to the power source and the electric machine and configured to increase or decrease a rotor flux component of a voltage applied to the electric machine, while maintaining a torque component at an essentially constant level. The system further has a control device configured to determine at least one parameter of the electric machine and operate the inverter in either a first or a second mode in response to the at least one determined parameter.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: March 31, 2009
    Assignee: Caterpillar Inc.
    Inventors: Gregory J. Speckhart, Mark Edward Hartman, Jackson Wai, Joshua Michael Williams
  • Electric motor system implementing vector and slip control
    Publication number: 20080100257
    Abstract: A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter operationally connected to the power source and the electric machine and configured to increase or decrease a rotor flux component of a voltage applied to the electric machine, while maintaining a torque component at an essentially constant level. The system further has a control device configured to determine at least one parameter of the electric machine and operate the inverter in either a first or a second mode in response to the at least one determined parameter.
    Type: Application
    Filed: October 31, 2006
    Publication date: May 1, 2008
    Inventors: Gregory J. Speckhart, Mark Edward Hartman, Jackson Wai, Joshua Michael Williams