Patents by Inventor Armin Schrepfer

Armin Schrepfer 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).

  • Electrical machine having an apparatus for avoiding damaging bearing currents, and a corresponding method
    Patent number: 8004129
    Abstract: The aim is to avoid damaging lubricating-film discharges occurring via bearings (WL) in electrical machines. For this reason, provision is made for a current to be forced to flow through the bearing (WL) specifically, with the aid of a current source (IQ). The current then flows from one of the two bearing components via the lubricating film to the other bearing component. Alternating currents are particularly suitable since the lubricating film is conductive, so that the capacitance defined by the lubricating film cannot be charged, or can be charged only slightly.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: August 23, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventors: Armin Schrepfer, Andreas Binder, Jürgen Wolf
  • Compensation method and apparatus for preventing damaging bearing currents in an electrical machine
    Patent number: 7501784
    Abstract: In an apparatus to increase the service life of bearings in an electric machine, the bearing currents that act on the bearings of the rotor are reduced by the application of a corresponding negative field voltage to the rotor, obtained with the aid of a compensation unit. The reduction of the bearing currents prevents ripple formation in the bearing and increased ageing of the lubricant.
    Type: Grant
    Filed: April 4, 2005
    Date of Patent: March 10, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventor: Armin Schrepfer
  • ELECTRICAL MACHINE HAVING AN APPARATUS FOR AVOIDING DAMAGING BEARING CURRENTS, AND A CORRESPONDING METHOD
    Publication number: 20090015112
    Abstract: The aim is to avoid damaging lubricating-film discharges occurring via bearings (WL) in electrical machines. For this reason, provision is made for a current to be forced to flow through the bearing (WL) specifically, with the aid of a current source (IQ). The current then flows from one of the two bearing components via the lubricating film to the other bearing component. Alternating currents are particularly suitable since the lubricating film is conductive, so that the capacitance defined by the lubricating film cannot be charged, or can be charged only slightly.
    Type: Application
    Filed: January 11, 2007
    Publication date: January 15, 2009
    Inventors: Andreas Binder, Armin Schrepfer, Jurgen Wolf
  • COMPENSATION APPARATUS FOR PREVENTION OF DAMAGING BEARING CURRENTS IN AN ELECTRICAL MACHINE, AND A CORRESPONDING COMPENSATION METHOD
    Publication number: 20070182357
    Abstract: In an apparatus to increase the service life of bearings in an electric machine, the bearing currents that act on the bearings of the rotor are reduced by the application of a corresponding negative field voltage to the rotor, obtained with the aid of a compensation unit. The reduction of the bearing currents prevents ripple formation in the bearing and increased ageing of the lubricant.
    Type: Application
    Filed: April 4, 2005
    Publication date: August 9, 2007
    Applicant: Siemens Aktiengesellschaft
    Inventor: ARMIN SCHREPFER