Patents by Inventor John Stephen Thorn

John Stephen Thorn 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).

  • Sensorless lost/found rotor detection for permanent magnet motors
    Patent number: 8638054
    Abstract: Various methods of detecting a found rotor, a lost rotor, a locked rotor and a caught rotor after a power disruption using flux estimates are disclosed. Also disclosed are permanent magnet motor controllers and assemblies suitable for performing one or more of these methods.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: January 28, 2014
    Assignee: Emerson Electric Co.
    Inventors: Michael I. Henderson, Joseph G. Marcinkiewicz, John Stephen Thorn
  • SENSORLESS LOST/FOUND ROTOR DETECTION FOR PERMANENT MAGNET MOTORS
    Publication number: 20130234639
    Abstract: Various methods of detecting a found rotor, a lost rotor, a locked rotor and a caught rotor after a power disruption using flux estimates are disclosed. Also disclosed are permanent magnet motor controllers and assemblies suitable for performing one or more of these methods.
    Type: Application
    Filed: April 26, 2013
    Publication date: September 12, 2013
    Applicant: Emerson Electric Co.
    Inventors: Michael I. Henderson, Joseph G. Marcinkiewicz, John Stephen Thorn
  • Sensorless lost/found rotor detection for permanent magnet motors
    Patent number: 8432112
    Abstract: Various methods of detecting a found rotor, a lost rotor, a locked rotor and a caught rotor after a power disruption using flux estimates are disclosed. Also disclosed are permanent magnet motor controllers and assemblies suitable for performing one or more of these methods.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: April 30, 2013
    Assignee: Emerson Electric Co.
    Inventors: Michael I. Henderson, Joseph G. Marcinkiewicz, John Stephen Thorn
  • Sensorless Lost/Found Rotor Detection for Permanent Magnet Motors
    Publication number: 20110068724
    Abstract: Various methods of detecting a found rotor, a lost rotor, a locked rotor and a caught rotor after a power disruption using flux estimates are disclosed. Also disclosed are permanent magnet motor controllers and assemblies suitable for performing one or more of these methods.
    Type: Application
    Filed: September 30, 2009
    Publication date: March 24, 2011
    Applicant: Emerson Electric Co.
    Inventors: Michael I. Henderson, Joseph G. Marcinkiewicz, John Stephen Thorn
  • Reprogrammable motor drive and control therefore
    Patent number: 6768279
    Abstract: A drive apparatus for use with a dynamoelectric machine system includes drive means connected to the dynamoelectric machine to control at least one of the current or voltage of the machine and a processor including a microcontroller for supplying machine control information to the drive means. A plurality of switches are connected to the processor and art positionable in a plurality of switch settings. Preselected switch settings correspond to operating characteristic information associated with corresponding versions of a given appliance, such that a user positions the switches in a desired switch setting to select the corresponding version of the given appliance. The microcontroller is programmed to read the switch setting and in response thereto, obtain the system operating characteristic information corresponding to the selected version of the given appliance from said second memory so as to permit the system to be used in different versions of the given appliance.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: July 27, 2004
    Assignee: Emerson Electric Co.
    Inventors: James Skinner, John Stephen Thorn, Craig Nordby, Joseph G. Mercinkiewicz