Patents by Inventor Joga Dharma Setiawan

Joga Dharma Setiawan 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).

  • Adaptive compensation of sensor run-out and mass unbalance in magnetic bearing systems without changing rotor speed
    Patent number: 6763285
    Abstract: The present invention provides a method and system for stabilizing a rotor about its geometric center in a magnetic bearing system at a constant rotor speed. In the method, the controller for controlling the magnetic bearing uses an adaptive control algorithm which simultaneously identifies and compensates for synchronous sensor runout and rotor mass unbalance while determining a control action that drives the rotor rotating at a constant speed to its geometric center. The identification of sensor runout and mass unbalance is by varying the magnetic stiffness which is achieved by perturbation of the bias currents in opposing electromagnet coils in a manner that does not alter the equilibrium of the rotor while it is rotating at a constant speed.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: July 13, 2004
    Assignee: Board of Trustees of Michigan State University
    Inventors: Joga Dharma Setiawan, Ranjan Mukherjee
  • Adaptive compensation of sensor run-out and mass unbalance in magnetic bearing systems without changing rotor speed
    Publication number: 20030038552
    Abstract: The present invention provides a method and system for stabilizing a rotor about its geometric center in a magnetic bearing system at a constant rotor speed. In the method, the controller for controlling the magnetic bearing uses an adaptive control algorithm which simultaneously identifies and compensates for synchronous sensor runout and rotor mass unbalance while determining a control action that drives the rotor rotating at a constant speed to its geometric center. The identification of sensor runout and mass unbalance is by varying the magnetic stiffness which is achieved by perturbation of the bias currents in opposing electromagnet coils in a manner that does not alter the equilibrium of the rotor while it is rotating at a constant speed.
    Type: Application
    Filed: August 21, 2001
    Publication date: February 27, 2003
    Applicant: Board of Trustees operating Michigan State University
    Inventors: Joga Dharma Setiawan, Ranjan Mukherjee