Patents by Inventor Mark Pfeiffer

Mark Pfeiffer 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).

  • Publication number: 20060043923
    Abstract: A motor controller of the sort having both a transformation function for transforming three-phase feedback information into two components, and then changing an error signal for each of the two components back into three-phase correction numbers is provided with an ARCTAN correction function. The ARCTAN correction function takes in the time derivative of the changing angular position of the motor rotor, and creates a correction factor that is supplied back to the transformation function for changing the two error signals back into three. By supplying this correction ARCTAN function, the control eliminates a disturbance that may have occurred in the prior art at higher frequencies wherein both of the control loops for the two components needed to come into play to correct an error on either of the two loops.
    Type: Application
    Filed: August 31, 2004
    Publication date: March 2, 2006
    Inventors: Donal Baker, Curtis Plude, Gary Miles, Mark Pfeiffer
  • Patent number: 6791208
    Abstract: An electrical power controller controls the selection of power sources, backup generator and normal utility line, to an automatically controlled load and other loads during and at the end of a power failure in a system. As long as the automatic load needs to be on, the power controller will connect the automatic load directly to a backup generator bypassing the transfer switch and disable a stop generator signal. When utility power returns, the transfer switch switches all other loads to operate from utility power and the transfer switch sends the stop signal to the backup generator. However, only when the power controller determines that the automatic load is no longer turned on will it re-enable the stop signal and return the automatic load to normal utility power selected by the transfer switch.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: September 14, 2004
    Inventor: Mark Pfeiffer
  • Publication number: 20040124710
    Abstract: An electrical power controller controls the selection of power sources, backup generator and normal utility line, to an automatically controlled load and other loads during and at the end of a power failure in a system. As long as the automatic load needs to be on, the power controller will connect the automatic load directly to a backup generator bypassing the transfer switch and disable a stop generator signal. When utility power returns, the transfer switch switches all other loads to operate from utility power and the transfer switch sends the stop signal to the backup generator. However, only when the power controller determines that the automatic load is no longer turned on will it re-enable the stop signal and return the automatic load to normal utility power selected by the transfer switch.
    Type: Application
    Filed: December 27, 2002
    Publication date: July 1, 2004
    Inventor: Mark Pfeiffer