Patents by Inventor Si J. Fang

Si J. Fang 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).

  • High voltage DC power generation
    Patent number: 9059647
    Abstract: A DC power generating system includes a permanent magnet generator (PMG), an active rectifier in electrical communication with the PMG, and a controller in electrical communication with the active rectifier, wherein the controller is configured to regulate d-q components of a stator current of the PMG in a synchronous reference frame.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: June 16, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Steven J. Moss, Si J. Fang
  • Flux cancellation in a permanent magnet generator
    Patent number: 8278858
    Abstract: A permanent magnet comprises a primary winding, a secondary winding, a permanent magnet, an output terminal for connection to an external load, and a switching mechanism with two modes. In a first mode of the switching mechanism, the primary winding is connected between neutral and the output terminal, and the varying magnetic flux from the permanent magnet induces a nonzero voltage at the output terminal. In the second mode, the secondary winding provides a return path to neutral for the primary winding, thereby providing negligible voltage and current at the output terminal and substantially canceling change in magnetic flux from the permanent magnet.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: October 2, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Si J. Fang, Richard A. Himmelmann, James H. Clemmons
  • FLUX CANCELLATION IN A PERMANENT MAGNET GENERATOR
    Publication number: 20120181892
    Abstract: A permanent magnet comprises a primary winding, a secondary winding, a permanent magnet, an output terminal for connection to an external load, and a switching mechanism with two modes. In a first mode of the switching mechanism, the primary winding is connected between neutral and the output terminal, and the varying magnetic flux from the permanent magnet induces a nonzero voltage at the output terminal. In the second mode, the secondary winding provides a return path to neutral for the primary winding, thereby providing negligible voltage and current at the output terminal and substantially canceling change in magnetic flux from the permanent magnet.
    Type: Application
    Filed: January 19, 2011
    Publication date: July 19, 2012
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Si J. Fang, Richard A. Himmelmann, James H. Clemmons
  • HIGH VOLTAGE DC POWER GENERATION
    Publication number: 20120126758
    Abstract: A DC power system includes a permanent magnet generator (PMG), and an active rectifier in electrical communication with the PMG. The active rectifier is adapted to actively rectify power output from the PMG if the PMG is operating at low speed, and the active rectifier is further adapted to passively rectify power output from the PMG if the PMG is operating at high speed.
    Type: Application
    Filed: November 19, 2010
    Publication date: May 24, 2012
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Si J. Fang, Richard A. Himmelmann, Steven J. Moss, Gregory I. Rozman
  • HIGH VOLTAGE DC POWER GENERATION
    Publication number: 20120119711
    Abstract: A DC power generating system includes a permanent magnet generator (PMG), an active rectifier in electrical communication with the PMG, and a controller in electrical communication with the active rectifier, wherein the controller is configured to regulate d-q components of a stator current of the PMG in a synchronous reference frame.
    Type: Application
    Filed: November 16, 2010
    Publication date: May 17, 2012
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Gregory I. Rozman, Steven J. Moss, Si J. Fang