Alstom Technology Limited

General Electric Technology Gmbh

Ralf Rotzinger

Reinhard Joho

Markus Staubli

Sorin Keller

Alfred Ziegler

Jesus Contreras-Espada

Hermfred Gohn

Claudio Picech

Bartolomeus Irwanto

Lothar Eckert

Markus Vogt

A rotor () for a generator, especially for a turbogenerator, is assembled from a plurality of separate rotor elements () which are arranged one behind the other in the rotor axis (), wherein the rotor elements () abut on connecting faces and are welded to one another, forming circular weld seams () which concentrically encompass in each case an annular central gap () 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 () the gap merges into a widening cavity () which is adjacent to the weld seam ().

Welded multipartite rotor for a generator

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.

Method for manufacturing a rotor

A turbogenerator () has a rotor () having a cylindrical rotor body (), which at each of the two ends merges into a shaft end (), and in a middle section has the electromagnetically active region () of the rotor (), in which the rotor () is assembled from a plurality of rotor parts which are interconnected and arranged in series on the rotor axis (). 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 () in the active region () is formed of an easily magnetizable material, especially a first steel, and in that the end sections of the rotor body () which are located outside the active region () and the shaft ends () are formed of a material with reduced magnetizability or of a non-magnetic material, especially a second steel.

Turbogenerator

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 ( ) consisting of steel and the retaining ring liner sheet ( ), spatially separating the end winding insulation ( ) from the rotor end bell ( ), consisting of titanium or a titanium alloy. Moreover, a lubricant ( ) with a temperature stability of >300&deg; C. is applied between the retaining ring liner sheet ( ) and the rotor end bell ( ).

Electrical machine

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Murg-Niederhof, Germany

Ralf Rotzinger