Abstract: 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.

Abstract: 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.

Abstract: The present invention relates to a polyurethane powder coating composition containingA) a binder component which is solid below 40.degree. C. and liquid above 130.degree. C. and has an OH number of 25 to 200 and a number average molecular weight of 400 to 10,000,B) a polyaddition compound which is solid below 40.degree. C. and liquid above 125.degree. C., contains uretdione groups and optionally free isocyanate groups and is prepared from aliphatic and/or cycloaliphatic diisocyanates andC) one or more catalysts containing N,N,N'-trisubstituted amidine groups which have an amidine group content (calculated as CN.sub.2 ; molecular weight=40) of 12.0 to 47.0 wt. %,provided that components A) and B) are present in amounts such that component B) has 0.6 to 1.4 isocyanate groups for each hydroxyl group present in component A) and the amount of component C) is 0.05 to 5 wt. %, based on the total weight of the coating composition.

Abstract: The present invention relates to a powder coating composition for the production of matt coatings containing as binderA) a component having hydroxyl groups,B) a polyisocyanate having blocked and optionally free isocyanate groups,C) a component having carboxyl groups and/or carboxylic anhydride groups and contains one or more of the following:C1) aliphatic and/or cycloaliphatic dicarboxylic acids having 4 to 20 carbon atoms,C2) monomeric and/or polymeric anhydrides of dicarboxylic acids C1) andC3) aliphatic hydroxycarboxylic acids having 4 to 18 carbon atoms, andD) a component which has groups that are reactive with carboxyl groups and/or carboxylic anhydride groups wherein components A), B), C) and D) are present in amounts such that1) 0.6 to 1.4 isocyanate groups of component B) are present for each hydroxyl group of component A),2) 0.3 to 1.

Abstract: The present invention relates to a powder coating composition for the production of matte coatings, containingA) a hydroxyl group-containing component,B) an addition polymerization compound which is based on aliphatic and/or cycloaliphatic diisocyanates and contains uretdione groups,C) a component which contains carboxyl and/or carboxylic acid anhydride groups and is selected fromC1) aliphatic and/or cycloaliphatic dicarboxylic acids containing 4 to 20 carbon atoms,C2) monomeric and/or polymeric anhydrides of the acids C1) which may optionally be modified andC3) aliphatic hydroxycarboxylic acids containing 4 to 18 carbon atoms, andD) a component which contains groups which are reactive with carboxyl and/or carboxylic acid anhydride groups,provided that components A), B), C) and D) are present in amounts such that 0.6 to 1.4 isocyanate groups of component B) are present for each hydroxyl group of component A), 0.3 to 1.

Abstract: This invention relates to a process for producing an insulation system (1) for an electrically conductive component (10). Use is made of an insulating material (5) which is protected against damage by the partial discharge of electric fields. To produce the insulating material (5), a substrate material (2) having an insulating coating (3) on one or both of its surfaces is impregnated with a chemical compound (4). This is hardened by radiation polymerisation and/or the application of heat to secure the insulating material (5) and bond the insulation system (1) permanently to the component (10).