Patents by Inventor Willard C. Pearson

Willard C. Pearson 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).

  • Eddy current servo system for controlling the rotation of disk packs
    Patent number: 4355266
    Abstract: A servo system provides phase locked servo control of the rotational speed and phase of one, two, or more, disk packs by operating the disk pack, or packs, approximately 2% faster than desired, and then applying a control current to an existing eddy current brake in the disk pack via a servo circuit to reduce the speed to that desired. The servo circuit regulates the servo control current to the brake via two loops; a phase loop which establishes a pack position relative to an external reference pulse, and a velocity loop which provides compensation to enhance lock-up time and improve overall stability. The summed outputs of both loops provide a composite error signal corresponding to the servo control current.
    Type: Grant
    Filed: July 31, 1980
    Date of Patent: October 19, 1982
    Assignee: Ampex Corporation
    Inventor: Willard C. Pearson