Patents by Inventor W. Thomas Boston

W. Thomas Boston 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).

  • Method and apparatus for correcting hysteresis synchronous motor hunting
    Patent number: 5235263
    Abstract: A method and apparatus for accurately controlling a hysteresis synchronous motor velocity eliminate low frequency hunting, which is characteristic of the motor. A nominal input phase current is modified by providing feedback information, thereby enabling a microprocessor control system to modify the phase of quadrature input current signal to the motor and thereby eliminating hunting of the motor. Accordingly, in a high resolution scanning application, speed variations which could cause disturbing artifacts to appear in an output image are eliminated.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: August 10, 1993
    Assignee: ECRM Trust
    Inventors: W. Thomas Boston, James A. Carl, John L. Connolly, III