Patents by Inventor Ralf Rotzinger
Ralf Rotzinger 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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Patent number: 8513841Abstract: A rotor (10) for a generator, especially for a turbogenerator, is assembled from a plurality of separate rotor elements (11, 12) which are arranged one behind the other in the rotor axis (18), wherein the rotor elements (11, 12) abut on connecting faces and are welded to one another, forming circular weld seams (17) which concentrically encompass in each case an annular central gap (37) with a predetermined gap width. In order to achieve a maximum magnetically active volume with mechanical stresses which are as low as possible, on the outer circumference of the gap (37) the gap merges into a widening cavity (38) which is adjacent to the weld seam (17).Type: GrantFiled: February 27, 2008Date of Patent: August 20, 2013Assignee: Alstom Technology Ltd.Inventors: Ralf Rotzinger, Markus Vogt, Reinhard Joho
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Patent number: 8448841Abstract: A method for manufacturing a rotor by welding a plurality of elements together is described. The elements have a body with cavities and surfaces to be welded to surfaces of adjacent elements. According to the method, the elements are vertically stacked one above the other to form a pile with facing surfaces to be welded together defining slots. The cavities of adjacent elements define bores that extend within the pile. Then, adjacent elements are welded together within the slots. The bore is purged with an inert gas or mixture during welding. The slots are welded at an upper part of the bore before the slots at a lower part of the bore, and a slot at the upper part of the bore is welded last.Type: GrantFiled: November 30, 2011Date of Patent: May 28, 2013Assignee: Alstom Technology LtdInventors: Ralf Rotzinger, Sorin Keller, Jesus Contreras-Espada
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Patent number: 8330321Abstract: A turbogenerator (10) has a rotor (11) having a cylindrical rotor body (13), which at each of the two ends merges into a shaft end (14), and in a middle section has the electromagnetically active region (23) of the rotor (11), in which the rotor (11) is assembled from a plurality of rotor parts which are interconnected and arranged in series on the rotor axis (19). With such a rotor, lower losses and temperatures in the end region of the rotor, and overall a higher limit rating or a broadened output range, become possible as a result of the fact that the rotor body (13) in the active region (23) is formed of an easily magnetizable material, especially a first steel, and in that the end sections of the rotor body (13) which are located outside the active region (23) and the shaft ends (14) are formed of a material with reduced magnetizability or of a non-magnetic material, especially a second steel.Type: GrantFiled: July 30, 2009Date of Patent: December 11, 2012Assignee: ALSTOM Technology Ltd.Inventors: Markus Staubli, Reinhard Joho, Ralf Rotzinger
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Publication number: 20120299435Abstract: A method for applying a retaining system above a rotor core of an electric machine includes providing a rotor including a rotor core, a rotor shaft and a coupling, cutting an inner ring from the rotor, connecting a retaining ring above the rotor core with a portion thereof extending above the rotor shaft, connecting the inner ring within a free end of the retaining ring, leaving a portion of the inner ring projecting from the retaining ring, providing an outer ring, connecting the outer ring above the projecting portion of the inner ring.Type: ApplicationFiled: May 22, 2012Publication date: November 29, 2012Applicant: ALSTOM TECHNOLOGY LTDInventors: Ralf Rotzinger, Christian Paatz, Anton Wehrle
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Publication number: 20120223126Abstract: A method for manufacturing a rotor by welding a plurality of elements together is described. The elements have a body with cavities and surfaces to be welded to surfaces of adjacent elements. According to the method, the elements are vertically stacked one above the other to form a pile with facing surfaces to be welded together defining slots. The cavities of adjacent elements define bores that extend within the pile. Then, adjacent elements are welded together within the slots. The bore is purged with an inert gas or mixture during welding. The slots are welded at an upper part of the bore before the slots at a lower part of the bore, and a slot at the upper part of the bore is welded last.Type: ApplicationFiled: November 30, 2011Publication date: September 6, 2012Applicant: ALSTOM TECHNOLOGY LTDInventors: Ralf ROTZINGER, Sorin KELLER, Jesus CONTRERAS-ESPADA
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Publication number: 20100117472Abstract: A turbogenerator (10) has a rotor (11) having a cylindrical rotor body (13), which at each of the two ends merges into a shaft end (14), and in a middle section has the electromagnetically active region (23) of the rotor (11), in which the rotor (11) is assembled from a plurality of rotor parts which are interconnected and arranged in series on the rotor axis (19). With such a rotor, lower losses and temperatures in the end region of the rotor, and overall a higher limit rating or a broadened output range, become possible as a result of the fact that the rotor body (13) in the active region (23) is formed of an easily magnetizable material, especially a first steel, and in that the end sections of the rotor body (13) which are located outside the active region (23) and the shaft ends (14) are formed of a material with reduced magnetizability or of a non-magnetic material, especially a second steel.Type: ApplicationFiled: July 30, 2009Publication date: May 13, 2010Inventors: Markus Staubli, Reinhard Joho, Ralf Rotzinger
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Publication number: 20080211339Abstract: A rotor (10) for a generator, especially for a turbogenerator, is assembled from a plurality of separate rotor elements (11, 12) which are arranged one behind the other in the rotor axis (18), wherein the rotor elements (11, 12) abut on connecting faces and are welded to one another, forming circular weld seams (17) which concentrically encompass in each case an annular central gap (37) with a predetermined gap width. In order to achieve a maximum magnetically active volume with mechanical stresses which are as low as possible, on the outer circumference of the gap (37) the gap merges into a widening cavity (38) which is adjacent to the weld seam (17).Type: ApplicationFiled: February 27, 2008Publication date: September 4, 2008Inventors: Ralf Rotzinger, Markus Vogt, Reinhard Joho
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Publication number: 20060038462Abstract: A rotor for a generator, in particular a high-power turbogenerator, has slots, which run axially in a rotor body and have conductor bars inserted in them, which are supported radially in the slots by means of wedges and are in each case electrically connected to one another at the ends of the rotor body in a rotor end winding. The rotor end windings are each covered by a rotor cap which is pushed over the end of the rotor body, and an electrically insulating covering channel is arranged in each of the slots between the uppermost conductor bar and the wedge and is connected outside the rotor body to a cap insulation, which is arranged between the rotor end winding and the rotor cap. The covering channels are formed with axially stepped ends at the ends of the rotor body.Type: ApplicationFiled: August 18, 2005Publication date: February 23, 2006Applicant: ALSTOM Technology Ltd.Inventors: Andrew Holmes, Georg Klein, John Lindh, Kevin Mayor, Ralf Rotzinger
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Patent number: 6836053Abstract: The object of the invention is to provide improved protection for the insulation of the rotor end windings of electrical machines that is suitable in particular for electrical limit-rating machines. This is achieved by the rotor end bell (2) consisting of steel and the retaining ring liner sheet (10), spatially separating the end winding insulation (9) from the rotor end bell (2), consisting of titanium or a titanium alloy. Moreover, a lubricant (11) with a temperature stability of >300° C. is applied between the retaining ring liner sheet (10) and the rotor end bell (2).Type: GrantFiled: April 19, 2002Date of Patent: December 28, 2004Assignee: Alstom Technology LTDInventors: Hermfred Gohn, Claudio Picech, Ralf Rotzinger, Alfred Ziegler
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Publication number: 20020180305Abstract: The object of the invention is to provide improved protection for the insulation of the rotor end windings of electrical machines that is suitable in particular for electrical limit-rating machines. This is achieved by the rotor end bell (2) consisting of steel and the retaining ring liner sheet (10), spatially separating the end winding insulation (9) from the rotor end bell (2), consisting of titanium or a titanium alloy. Moreover, a lubricant (11) with a temperature stability of >300° C. is applied between the retaining ring liner sheet (10) and the rotor end bell (2).Type: ApplicationFiled: April 19, 2002Publication date: December 5, 2002Inventors: Hermfred Gohn, Claudio Picech, Ralf Rotzinger, Alfred Ziegler