The invention relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing material strips (2) from a metallic material; b) vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strips (2), and vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; c) stacking the rings (3, 31, 32) such that the cut-outs (5) of all disk-shaped rings (3, 31, 32) are disposed in mutual alignment; d) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

The invention furthermore relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing a material strip (2) from a metallic material; b) vertically edge-rolling the material strip (2) so as to form a helix (4); separating the metal strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strip (2); vertically edge-rolling the material strip (2) so as to form a helix (4); and separating the material strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); c) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

The invention relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing material strips (2) from a metallic material; b) vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strips (2), and vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; c) stacking the rings (3, 31, 32) such that the cut-outs (5) of all disk-shaped rings (3, 31, 32) are disposed in mutual alignment; d) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

The invention furthermore relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing a material strip (2) from a metallic material; b) vertically edge-rolling the material strip (2) so as to form a helix (4); separating the metal strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strip (2); vertically edge-rolling the material strip (2) so as to form a helix (4); and separating the material strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); c) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

A rotor for an electric machine includes: a rotor body; winding elements; and a winding head, which includes a winding head support and retaining elements, each of which includes a tension bolt and a support body, wherein the support bodies are arranged at least partially in a radial direction outside of the winding elements, wherein the tension bolt penetrates the support body associated therewith and is screwed into the winding head support by a thread, wherein each of the retaining elements includes a stop surface for coming into contact with the winding head support when screwing in the tension bolts in order thereby to adjust a radial length with which the tension bolts protrude from the winding head support to a predefined dimension, and wherein the predefined dimension is calculated so that the support bodies are not pressed against the winding elements in a resting position of the rotor.

A method for producing a coated component consisting of transparent or opaque fused silica comprises a method step in which a SiO.sub.2 granulation layer is applied to a coating surface of a substrate, which in the area of the free surface has a relatively great granulation fine fraction. Starting from this, in order to achieve a smooth, preferably also dense surface layer, it is suggested according to the invention that the application of the SiO.sub.2 granulation layer comprises (i) providing a dispersion containing a dispersion liquid and amorphous SiO.sub.2 particles which form a coarse fraction with particle sizes ranging between 1 m and 50 m and a fine fraction of SiO.sub.2 nanoparticles having particle sizes of less than 100 nm, wherein the solids content of the dispersion is between 70 and 80 wt.-%, and of which between 2 wt.-% and 15 wt.-% are the SiO.sub.2 nanoparticles, (ii) applying the dispersion to the coating surface by casting or spraying it thereonto so as to form a slurry layer having a layer thickness of at least 0.3 mm; and (iii) drying the slurry layer by removing the dispersion liquid at a rate and in a direction such that under the action of the dispersion liquid being removed the fine fraction is enriched in the outer portion of the granulation layer, thereby forming a casting skin.

A method for producing a coated component consisting of transparent or opaque fused silica comprises a method step in which a SiO.sub.2 granulation layer is applied to a coating surface of a substrate, which in the area of the free surface has a relatively great granulation fine fraction. Starting from this, in order to achieve a smooth, preferably also dense surface layer, it is suggested according to the invention that the application of the SiO.sub.2 granulation layer comprises (i) providing a dispersion containing a dispersion liquid and amorphous SiO.sub.2 particles which form a coarse fraction with particle sizes ranging between 1 m and 50 m and a fine fraction of SiO.sub.2 nanoparticles having particle sizes of less than 100 nm, wherein the solids content of the dispersion is between 70 and 80 wt.-%, and of which between 2 wt.-% and 15 wt.-% are the SiO.sub.2 nanoparticles, (ii) applying the dispersion to the coating surface by casting or spraying it thereonto so as to form a slurry layer having a layer thickness of at least 0.3 mm; and (iii) drying the slurry layer by removing the dispersion liquid at a rate and in a direction such that under the action of the dispersion liquid being removed the fine fraction is enriched in the outer portion of the granulation layer, thereby forming a casting skin.

A female contact element for a slip ring motor with a power output >1 MW. The female contact element is configured for engagement with a male contact element to make an electrical connection between the female contact element and the male contact element. The female contact element is made of a CuBe-alloy.

A female contact element for a slip ring motor with a power output >1 MW. The female contact element is configured for engagement with a male contact element to make an electrical connection between the female contact element and the male contact element. The female contact element is made of a CuBe-alloy.

A hybrid drivetrain for a vehicle includes a doubly fed induction machine, a first inverter and a second inverter. The doubly fed induction machine includes a stator with a plurality of stator windings and a rotor. The rotor includes a plurality of rotor windings and a plurality of slip rings electrically connected to the plurality of rotor windings. The first inverter is arranged to provide a first multi-phase power to the plurality of stator windings and the second is inverter arranged to provide a second multi-phase power to the plurality of rotor windings through the plurality of slip rings. In an example embodiment, the second multi-phase power is provided to the plurality of slip rings through a plurality of brushes. In an example embodiment, a quantity of the plurality of slip rings is exactly three.

A hybrid drivetrain for a vehicle includes a doubly fed induction machine, a first inverter and a second inverter. The doubly fed induction machine includes a stator with a plurality of stator windings and a rotor. The rotor includes a plurality of rotor windings and a plurality of slip rings electrically connected to the plurality of rotor windings. The first inverter is arranged to provide a first multi-phase power to the plurality of stator windings and the second is inverter arranged to provide a second multi-phase power to the plurality of rotor windings through the plurality of slip rings. In an example embodiment, the second multi-phase power is provided to the plurality of slip rings through a plurality of brushes. In an example embodiment, a quantity of the plurality of slip rings is exactly three.

Described herein is a rotating electrical machine, set of such machines, and associated boat and rolling mill. The rotating electrical machine includes a stator, a shaft centered in the stator, a first cylindrical magnetic mass and a second cylindrical magnetic mass, the first cylindrical magnetic mass and the second cylindrical magnetic mass enclosing the shaft and arranged in series on the shaft, the first cylindrical magnetic mass and the second cylindrical magnetic mass being separated by an air gap, the stator including coils, each coil being opposite to the two cylindrical magnetic masses. Each cylindrical magnetic mass includes a stack of compacted laminated magnetic sheets, first fastening means configured to fix the first cylindrical magnetic mass and the shaft, and second fastening means configured to fix the second cylindrical magnetic mass and the shaft.