Patents by Inventor Randy Schoen

Randy Schoen 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).

  • Induction machine protection device
    Patent number: 5644458
    Abstract: A device and apparatus for monitoring faults in a three phase induction machine are disclosed herein. The device and method utilize values of the currents in the three phases and the voltages of the three phases to estimate a current portion which is not substantially affected by the load torque effects of the machine. This current portion is related to the unacceptable magnetic fields present in the machine. These fields are typically caused by electrical or mechanical problems in the machine, and when the current portion exceeds a predetermined limit, operation of the machine can be discontinued.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: July 1, 1997
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: Randy Schoen, Thomas G. Habetler
  • Induction machine protection device
    Patent number: 5570256
    Abstract: A device and apparatus for monitoring faults in a three phase induction machine are disclosed herein. The device and method utilize values of the currents in the three phases and the voltages of the three phases to estimate a current portion which is not substantially affected by the load torque effects of the machine. This current portion is related to the unacceptable magnetic fields present in the machine. These fields are typically caused by electrical or mechanical problems in the machine, and when the current portion exceeds a predetermined limit, operation of the machine can be discontinued.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: October 29, 1996
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: Randy Schoen, Thomas G. Habetler