Patents Examined by Thomas M. Dougerty
  • Brushless synchronous machine
    Patent number: 5783891
    Abstract: A brushless synchronous machine, for example a synchronous generator, having an exciter, whose field excitation winding is powered via a regulator connected to a separate auxiliary winding in the stator of the main machine in which the auxiliary winding has a number of phases that differs from the harmonic number of the harmonic wave that is the strongest in the event of a short circuit. In the case of a strong third harmonic wave, the auxiliary winding has a four- or five-phase design.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: July 21, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Herbert Auinger, Jurgen Bredthauer, Bernhard Wachta