Patents by Inventor H{dot over (a)}kan Swahn

H{dot over (a)}kan Swahn 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).

  • Electric machine
    Patent number: 7498775
    Abstract: A method and an apparatus are described for monitoring a rotating synchronous electric machine (9), which comprises a rotor having a rotor winding and a stator having a stator winding. The method comprises the steps of determining the stator winding current, determining the stator winding voltage, determining the rotor winding current, and estimating the temperature in at least two positions in the electric machine (9) using a model of the electric machine and the determined current and voltage values. An apparatus according to the invention is provided for carrying out the method.
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: March 3, 2009
    Assignee: E.On Sverige AB
    Inventors: H{dot over (a)}kan Swahn, Bertil Svensson