Patents by Inventor Christoph Lehmann

Christoph Lehmann 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).

  • Publication number: 20090295252
    Abstract: An arrangement having at least two generator bars for a stator of an electrical generator which are electrically connected to one another via a respective bar end is characterized, according to the invention, by the fact that the respective bar ends, which are electrically connected to one another, of the at least two generator bars are braced with respect to one another by means of a tape.
    Type: Application
    Filed: November 23, 2006
    Publication date: December 3, 2009
    Inventors: Waldemar Kowalski, Christoph Lehmann, Claus-Georg Richter, Karlheinz Spiess
  • Publication number: 20090254308
    Abstract: The invention relate to a method for automatic monitoring of generator operation, which method has the following steps: recording of generator input variables, calculation of set generator output variables based on the recorded generator input variables, recording of the actual generator output variables, comparison of the recorded actual generator output variables with the calculated set generator output variables, and evaluation of the comparison results.
    Type: Application
    Filed: October 24, 2006
    Publication date: October 8, 2009
    Inventor: Christoph Lehmann
  • Publication number: 20080303279
    Abstract: According to the invention, a drive is embodied to drive a rotor at a variable rotational frequency; the rotor has a winding that is embodied to produce a rotary field magnetomotive force of a generator, with a rotor rotary field frequency which is variable in relation to the rotor; the frequency converter is electrically connected to the rotor winding; a regulating device comprises a recording element for measuring values of the generator, a calculating unit for a generator simulation, and a transmitter for transmitting a control signal to the frequency converter; and, on the basis of the control signal, an electrical excitation of the rotor winding can be triggered by the frequency converter in such a way that a pre-determined stator rotary field frequency is present in the event of a variable rotational frequency of the rotor and a variable rotor rotary field frequency
    Type: Application
    Filed: November 10, 2005
    Publication date: December 11, 2008
    Inventors: Christoph Lehmann, Peter Nover, Armin de Lazzer
  • Patent number: 6424062
    Abstract: The cooling system cools the stator and/or the rotor of a generator. Oxidation-resistant cooling channels are provided in the stator and/or in the rotor. Low conductivity for the coolant flowing through the cooling circuit is ensured by feeding fresh coolant into the cooling circuit, whereby the fresh coolant has a lower electric conductivity than the coolant in the cooling circuit.
    Type: Grant
    Filed: July 26, 2000
    Date of Patent: July 23, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Werner Adelmann, Kurt Becher, Uwe Eickelbeck, Horst-Werner Emshoff, Rainer Fischer, Christoph Lehmann, Karl Spiegelhoff
  • Patent number: 6326709
    Abstract: The cooling system cools the stator and/or the rotor of a generator. A compensating container for compensating coolant is arranged in a parallel section that is connected in parallel with the cooling circuit. A calming section is additionally arranged in the cooling circuit for largely degassing the coolant.
    Type: Grant
    Filed: July 26, 2000
    Date of Patent: December 4, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Werner Adelmann, Kurt Becher, Uwe Eickelbeck, Horst-Werner Emshoff, Rainer Fischer, Christoph Lehmann, Karl Spiegelhoff
  • Patent number: 6076568
    Abstract: A method for inerting a generator in a power station includes flushing the generator in a rapid manner which is favorable in terms of power consumption and is simplified in terms of process technology. Cooling gas which is present in the working state for cooling in the generator is displaced through the use of an inert gas stored in gaseous form, in particular argon. A phase transition from, for example, a liquid to a gaseous inert gas, which prolongs the inerting operation and consumes large amounts of power, can thus be dispensed with. The supply of inert gas can easily be monitored by pressure measurement.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: June 20, 2000
    Assignee: Siemens Aktiengesellschaft
    Inventors: Helmut Rehm, Klaus Weller, Christoph Lehmann