Patents by Inventor Yuuichi Nanae

Yuuichi Nanae 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).

  • Brushless motor drive circuit
    Patent number: 4760315
    Abstract: A brushless motor drive circuit includes a plurality of Hall elements for detecting magnetic flux changes of a rotating rotor magnet. A drive signal generating circuit generates drive signals applied to the stator windings of the motor. Each of the drive signals has a pair of slanted edge portions and a relatively flat portion interposed between the slanted edge portions which are directly formed from said detected flux changes. The circuit is effective in preventing acoustic noises during phase switching.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: July 26, 1988
    Assignee: Sony Corporation
    Inventors: Yuuichi Nanae, Hideo Niikura