Patents by Inventor Niels Molgaard

Niels Molgaard 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).

  • Control circuit for an A.C. motor
    Patent number: 4233551
    Abstract: The present invention relates to a control circuit for an A.C. motor with two or several sets of windings. The switch-off phase of the first set of windings is symmetrical with the turn-on phase of the second set of windings, and it is illustrated how to modify the supplied current by simultaneous, symmetrical modification of said phases. As a result a symmetrical field distribution over each pole is obtained even if the turn-on and switch-off phases of the currents supplied to the windings are regulated.
    Type: Grant
    Filed: June 1, 1978
    Date of Patent: November 11, 1980
    Assignee: Grundfos A/S
    Inventors: Axel Jensen, Niels Molgaard