Patents by Inventor Walter Schumbrutzki

Walter Schumbrutzki 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).

  • Circuit for and method of controlling 4-phase brushless DC motors
    Patent number: 5043641
    Abstract: A control circuit bipolarly controls the stator of a 4-phase brushless DC motor in which the staor windings are connected in a ring circuit with only four semiconductor switches. Also, two control sequences are possible: a first control sequence consisting of four switching events per revolution and number of pole pairs, in which only two semiconductor switches are activated at a time, and a second control sequence consisting of eight switching events per revolution and number of pole pairs, in which alternately two and three semiconductor switches are activated simultaneously.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: August 27, 1991
    Assignee: Standard Elektrik Lorenz AG
    Inventors: Josef Feigel, Walter Schumbrutzki