Patents by Inventor Uhn Joo Na

Uhn Joo Na 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).

  • System and method for controlling suspension using a magnetic field
    Patent number: 6323614
    Abstract: A system for controlling the position of a rotating member suspended using a magnetic field includes at least one sensor that is operable to detect the position of the rotating member, the sensor further being operable to generate a position reference signal in response to the detected position. The system also includes a controller in communication with the at least one sensor and being operable to generate an actuator control signal in response to receiving the position reference signal. The controller is operable to introduce a phase lead in the actuator control signal in response to a rotational speed of the rotating member. The system further includes at least one actuator in communication with the controller that is operable to adjust the position of the rotating member in response to the actuator control signal by modifying characteristics of the magnetic field.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: November 27, 2001
    Assignee: The Texas A&M University System
    Inventors: Alan Palazzolo, Mu Li, Uhn Joo Na, Erwin Thomas