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).
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Publication number: 20170353064Abstract: An arrangement for cooling at least one axial end region of a stator in a rotating electrical machine, having: at least one annular chamber which is disposed on the radially outer periphery of at least one portion of the axial end region having at least one radial cooling duct, and which on the radially inner part towards the axial end portion is at least partially open and is communicatingly connected to the radial cooling duct, and which is sealed with respect to the axial end region; and at least one low-pressure line which is communicatingly connected to the annular chamber, and via which the annular chamber is communicatingly connected to a low-pressure chamber in the rotating electrical machine which, relative to a flow of cooling fluid that is created by a shaft-mounted fan on a rotor in the rotating electric machine, is upstream of the shaft-mounted fan.Type: ApplicationFiled: October 30, 2015Publication date: December 7, 2017Applicant: Siemens AktiengesellschaftInventors: Thorsten Krol, Christoph Lehmann, Andrey Mashkin
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Patent number: 9712013Abstract: A winding for an electric machine is provided. The electric machine includes conductor bars which are arranged one above the other and each of which has a cooling slot. The conductor bars are designed such that the height of the conductor bars increases in the radial direction and the effective cooling cross-section decreases in the radial direction.Type: GrantFiled: June 21, 2013Date of Patent: July 18, 2017Assignee: Siemens AktiengesellschaftInventors: Waldemar Kowalski, Christoph Lehmann
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Patent number: 9595900Abstract: An assembly including an electric generator and a steam turbine and an excitation device is provided. The excitation device is designed such that during nominal operation the auxiliary excitation machine is designed as permanently excited synchronous machine and the auxiliary excitation machine is designed as a synchronous motor or turning gear motor in a turning gear operation.Type: GrantFiled: April 21, 2010Date of Patent: March 14, 2017Assignee: SIEMENS AKTIENGESELLSCHAFTInventor: Christoph Lehmann
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Publication number: 20160305280Abstract: A steam power plant with a liquid/steam circuit includes a steam generator for converting a liquid into steam, a steam turbine and a condenser for converting the steam into the liquid, a generator and a liquid cooling system for the generator, wherein the liquid cooling system has a connection to the liquid/steam circuit via a bypass-like path of flow through which the liquid from the liquid/steam circuit can be branched out to the liquid cooling system and can be led back from the liquid cooling system to the liquid/steam circuit.Type: ApplicationFiled: September 18, 2014Publication date: October 20, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160273410Abstract: A thermal power plant with a generator, includes a cooling system for the generator, wherein the waste heat released from the generator on cooling can be used profitably for operating the thermal power plant, including drying fuel, in particular for drying coal. In a method for using waste heat of a generator of a thermal power plant, the waste heat of the generator is used for drying fuel, in particular for drying coal.Type: ApplicationFiled: September 18, 2014Publication date: September 22, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160254729Abstract: An electric machine having a stator and a rotor arranged on an axis of rotation and a first fan, which extends in the radial direction on one section of the axis of rotation and delivers a coolant flow into the electric machine during operation. The electric machine further includes a fan directing element, which interacts with the first fan and deflects at least a proportion of the coolant flow. Variable and demand-based cooling of the electric machine can be achieved by the fan directing element, which can in particular be adjustable.Type: ApplicationFiled: September 12, 2014Publication date: September 1, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160241111Abstract: A device for deflecting at least a portion of a cooling fluid flowing axially in an intermediate space is arranged between a rotor and a stator of a rotating electrical machine, in particular of a turbogenerator, wherein at least one blade can be arranged on a prespecifiable section of an outer face of the rotor and in the intermediate space, which blade is designed and can be arranged in such a way that a portion of the cooling fluid flowing in the intermediate space can be radially deflected in the direction of the stator by said blade.Type: ApplicationFiled: September 11, 2014Publication date: August 18, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160226325Abstract: A cooling device for an electric machine includes a stator winding having at least one laminated stator core, which at least one laminated stator core has at least one laminated stator core and at least one stator winding head, wherein the cooling device has a plurality of channels through which a coolant can flow, which channels are connected to a pressure accumulator at a first end and leads into an impingement cooling plate and/or into a channel of a stator winding head at a second end of the channels. An electric machine includes a rotor and a stator, which stator has at least one stator winding, which has at least one laminated stator core and at least one stator winding head; wherein the electric machine includes a cooling device. The electric machine can be a generator and/or a motor.Type: ApplicationFiled: September 3, 2014Publication date: August 4, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160226345Abstract: A cooling device for an electric motor includes at least one closed capillary tube, within which a cooling fluid is located and which is introduced into an opening of a lamination stack of the electric motor such that the capillary tube is connected to the lamination stack to conduct heat and partially projects out of the lamination stack, such that the capillary tube has a cold end disposed outside and a hot end disposed inside the lamination stack. The cooling fluid and the degree of filling of the capillary tube with the cooling fluid is chosen such that an input of heat from the lamination stack into the capillary tube leads to evaporation of the cooling fluid, and the cold end of the capillary tube is cooled such that vapour produced during the evaporation condenses and heat input into the capillary tube is dissipated out of the capillary tube.Type: ApplicationFiled: September 3, 2014Publication date: August 4, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160208693Abstract: A power station having a gas turbine, a generator driven by the gas turbine for generation of electrical power, and a hydrogen cooling circuit for discharging lost heat from the generator, wherein the hydrogen cooling circuit has a feed line for feeding hydrogen from a hydrogen tank into the generator and a discharge line for discharging heated hydrogen from the generator, and wherein the discharge line is connected to a mixing device, such that the heated hydrogen from the discharge line can be mixed with a further fuel and is fed by means of a fuel feed line to the gas turbine.Type: ApplicationFiled: September 15, 2014Publication date: July 21, 2016Applicant: Siemens AktiengesellschaftInventors: Esteban Grau Sorarrain, Christian Jäkel, Mario Koebe, Matthias Kowalski, Christoph Lehmann, Andrey Mashkin, Olga Plotnikova, Carolin Schild
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Publication number: 20160006312Abstract: An electrodynamic machine includes a housing and a rotor, as well as a neutral point, wherein the neutral point is located inside the housing and the neutral point ends are interconnected by means of shorting bridges, and the shorting bridges are designed such that the neutral point ends inside the generator housing are electrically isolated from each other.Type: ApplicationFiled: February 20, 2014Publication date: January 7, 2016Applicant: SIEMENS AKTIENGESELLSCHAFTInventors: Waldemar Kowalski, Christoph Lehmann
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Publication number: 20150207385Abstract: An electric machine such as for example, an electric generator, is provided having a lock system which enables a monitoring device to be housed in the machine such that the generator is not required to be purged. The machine, which can be filled with a gas, with a housing, wherein a first chamber is arranged on the housing, wherein a first flap valve is arranged between the housing and the first chamber, creating a fluidic connection between said housing and first chamber, and a second chamber which is arranged on the first chamber, wherein a second flap valve is arranged between the first and the second chambers, creating a fluidic connection between said first chamber and second chamber, wherein a monitoring device for inspection purposes is provided in the housing.Type: ApplicationFiled: June 17, 2013Publication date: July 23, 2015Applicant: Siemens AktiengesellschaftInventors: Waldemar Kowalski, Christoph Lehmann
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Publication number: 20150200581Abstract: A monitoring system for monitoring an electric machine is provided. A mini-camera for observing the electric machine is arranged inside the electric machine. Moreover, the mini-camera is arranged movably on guide elements, wherein the guide element is designed in such a way that the mini-camera is held in an uncritical parked position during the operation of the electric machine.Type: ApplicationFiled: June 11, 2013Publication date: July 16, 2015Applicant: Siemens AktiengesellschaftInventors: Waldemar Kowalski, Christoph Lehmann
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Publication number: 20150188373Abstract: A winding for an electric machine is provided. The electric machine includes conductor bars which are arranged one above the other and each of which has a cooling slot. The conductor bars are designed such that the height of the conductor bars increases in the radial direction and the effective cooling cross-section decreases in the radial direction.Type: ApplicationFiled: June 21, 2013Publication date: July 2, 2015Applicant: Siemens AktiengesellschaftInventors: Waldemar Kowalski, Christoph Lehmann
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Patent number: 8847445Abstract: A rotor for a turbo generator is provided. The rotor includes a cylindrical rotor shaft that expands in the center to form a rotor body, grooves introduced into the cylindrical surface of the rotor body, an excitation winding accommodated in the grooves, a feeding duct through which a cooling gas flows, and cooling ducts which penetrate the excitation winding substantially in the radial direction and connect the feeding duct to respective outlets in the cylindrical surface of the rotor body A distribution duct extending in the longitudinal direction of the shaft is arranged in the area of the central longitudinal axis. The feeding ducts are connected to the distribution duct via junction ducts. An admission duct for feeding the cooling gas is provided for each distribution duct.Type: GrantFiled: February 23, 2010Date of Patent: September 30, 2014Assignee: Siemens AktiengesellschaftInventors: Waldemar Kowalski, Christoph Lehmann
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Publication number: 20120299248Abstract: A shaft sealing ring for a barrier oil sealing system of a hydrogen-cooled generator is designed, in the installed state, to bear radially against a generator shaft by way of its running surface arranged on the inner side and to interact with the generator shaft, under the action of a barrier oil, with hydrogen sealing, wherein the shaft sealing ring is produced from a lead bronze material.Type: ApplicationFiled: May 22, 2012Publication date: November 29, 2012Inventors: Christopher Cordiner, Thomas Günther, Christoph Lehmann, Oliver Majchrzak
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Publication number: 20120187923Abstract: An assembly including an electric generator and a steam turbine and an excitation device is provided. The excitation device is designed such that during nominal operation the auxiliary excitation machine is designed as permanently excited synchronous machine and the auxiliary excitation machine is designed as a synchronous motor or turning gear motor in a turning gear operation.Type: ApplicationFiled: April 21, 2010Publication date: July 26, 2012Inventor: Christoph Lehmann
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Patent number: 8193674Abstract: 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: GrantFiled: November 23, 2006Date of Patent: June 5, 2012Assignee: Siemens AktiengesellschaftInventors: Waldemar Kowalski, Christoph Lehmann, Claus-Georg Richter, Karlheinz Spiess
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Publication number: 20120119603Abstract: A rotor for a turbo generator is provided. The rotor includes a cylindrical rotor shaft that expands in the center to form a rotor body, grooves introduced into the cylindrical surface of the rotor body, an excitation winding accommodated in the grooves, a feeding duct through which a cooling gas flows, and cooling ducts which penetrate the excitation winding substantially in the radial direction and connect the feeding duct to respective outlets in the cylindrical surface of the rotor body A distribution duct extending in the longitudinal direction of the shaft is arranged in the area of the central longitudinal axis. The feeding ducts are connected to the distribution duct via junction ducts. An admission duct for feeding the cooling gas is provided for each distribution duct.Type: ApplicationFiled: February 23, 2010Publication date: May 17, 2012Inventors: Waldemar Kowalski, Christoph Lehmann
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Patent number: 7868594Abstract: 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: GrantFiled: November 10, 2005Date of Patent: January 11, 2011Assignee: Siemens AktiengesellschaftInventors: Christoph Lehmann, Peter Növer, Armin de Lazzer