Alstom Technology Limited

Abb Patent Gmbh

Alstom

Alston Technology Ltd

Alstom Power Inc.

Peter Klee

Thomas Baumann

Michael Baier

Henning Oetzmann

A device for impregnating an insulation of a winding bar of an electric machine includes a container accommodating the winding rod and connected to a tank containing an impregnation agent. The container, which remains open during the impregnation process, is surrounded by an evacuation container to create a negative pressure within the container. To achieve a more rapid penetration of the impregnation agent and to simplify the overall process, a vacuum-tight sleeve acts as the container, the sleeve being encompassed by a pressure-resistant sleeve, and a conduit of an assembly that generates a vacuum leads into the interior of the sleeve. The impregnation agent is supplied with a pressure that is lower than the prevailing pressure in the pressure-resistant sleeve. The container can be a multi-part tool defining an interior for surrounding and accommodating the winding bar in a positive fit at least during an evacuation and impregnation process.

Device for impregnating an insulation of a winding bar of an electrical machine

A Roebel bar () for an electrical machine comprises a plurality of essentially parallel, transposed conductor elements (), which, lying over and/or next to one another, form a bar with an essentially rectangular cross section, which is surrounded on the outside by an insulation () and has between the insulation () and the conductor elements () means () for forming an inner corona protection (ICP). In the case of such a Roebel bar, particularly effective inner corona protection is achieved by the fact that the means for inner corona protection comprise preformed, angled profiles () of an electrically conducting material, which, running in the longitudinal direction of the Roebel bar (), enclose the edges of the bar formed by the conductor elements (), and to which the insulation () is applied.

Roebel bar for an electrical machine and method for producing such a roebel bar

A device for impregnating a conductor bar for a stator winding of an electrical machine, which includes an impregnating device with a hose-like flexible casing for receiving and encasing a conductor bar over an entire length thereof, and wherein the conductor bar is formed with a rectilinear region and angled regions adjoining the rectilinear region and is provided with an insulation. The device further includes a device which communicates with the casing for filling the casing with pressurized impregnating fluid, and a pressing device with a stationary pressing device having a plurality of clamping jaws surrounding on all sides at least the rectilinear region of the conductor bar, and movable sleeve-like pressing devices surrounding and pressing the angled regions of the conductor bar adjoining the rectilinear region.

Device for impregnating conductor bars for the stator winding of an electrical machine

Conductor bars for the stator winding of an electrical machine are impregnated by winding the bars with an insulation, impregnating the insulation, and then curing. Specifically, the bars are provided on their surface with an insulation which is produced by wrapping each conductor bar with an insulating tape, preferably with a mica-containing insulating tape, which is impregnated with an insulating fluid, preferably curable synthetic resin. Each conductor bar provided with the finished insulation is provided over its entire length with a press-tight and fluid-tight casing. The encased conductor bar is subjected on all sides to a pressure p in a pressing device. The impregnating fluid is introduced into the interspace between the insulated conductor bar and the casing at a pressure P <P . The conductor bar, loaded with impregnating resin over its entire length in this way and surrounded by the casing, is pressed to shape and size at the curing temperature.

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Waldmichelbach, Germany

Peter Klee