Abstract: A slot-closing device for closing a slot in a stator or a rotor of an electric machine includes a closure element which contains a ferromagnetic material. An adhesive layer disposed on the closure element is designed to expand and harden when heated. The adhesive layer contains a thermally activatable blowing agent configured as an expansion element which contains a closed cavity filled with gas. The cavity is partially enclosed by a thermoplastic resin in the expansion element.

Abstract: An active part of an electrical machine, such as a rotor or a stator, an electrical machine having the active part, which has a main body and a winding that is surrounded by an encapsulation compound, where the encapsulation compound has at least three regions, where the winding extends through the main body in a slot in a first region, where the winding surrounded by the encapsulation compound projects out of the main body at least in a third region, and which has at least a second region arranged between the first region and the third region in the active part, where the encapsulation compound has a different composition in the second region than in the first region or the third region.

Abstract: The invention relates to a slot sealing material (7) for an electric machine, which for accommodating an electric conductor arrangement (3) comprises at least one slot (2) having a slot opening (5). Said slot sealing material contains a magnetic filler, especially a soft-magnetic filler, and a reaction resin mixture comprising at least one resin component and a curing agent component. To improve the temperature resistance and mechanical strength of the slot sealing material, a dianhydride is used as curing agent component.

Abstract: The present disclosure relates to insulation. Teachings thereof may be embodied in a solid insulation material, especially in tape form, the use thereof in a vacuum impregnation process and to an insulation system produced therewith, and also an electrical machine comprising the insulation system, especially for the medium- and high-voltage sector, namely for medium- and high-voltage machines, especially rotating electrical machines in the medium- and high-voltage sector, and to semifinished products for electrical switchgear. For example a solid insulation material with an anhydride-free impregnating agent may include: a carrier; a barrier material; a curing catalyst; and a tape adhesive. The curing catalyst and the tape adhesive are inert toward one another but react under the conditions of a vacuum impregnation process if combined with an anhydride-free impregnating agent having gelation times of 1 h to 15 h at impregnation temperature.

Abstract: The present disclosure relates to insulation. Various embodiments thereof may include a solid insulation material and/or a formulation for production of an insulation system. For example, a formulation for an impregnating agent may include: an impregnating resin comprising a cycloaliphatic epoxy resin having a viscosity of less than 1500 mPas at impregnation temperature; and a curing catalyst deposited in the solid insulation material. The curing catalyst may be reactive toward the cycloaliphatic epoxy groups of the cycloaliphatic epoxy resin in the formulation of the impregnating agent but be sufficiently reactively inert with respect to the functional groups of the tape adhesive likewise present in the solid insulation material to confer storage stability to the solid insulation material.

Abstract: The invention relates to a solid, in particular strip-shaped insulation material, to the use thereof in a vacuum impregnation method and a thus produced insulation system and to an electric machine using the insulation system, in particular for the medium and high voltage range, that is for medium and high voltage machines, in particular rotating electric machines in the medium and high voltage range and to semi-finished products for electric switching systems. According to the invention, the curing catalyst is a covalently-bridged di-imidazol derivative and/or a covalently-bridged di-pyrazol derivative.

Abstract: Tape adhesives suitable for impregnating processes for insulation systems are described. Embodiments of the tape adhesives include solid insulation material such as mica, anhydride-free impregnating resins and accelerators for the anhydride-free impregnating resins. The tape adhesives may be adjusted with respect to the reactivity of the accelerators for the anhydride-free impregnating resins in relation for the storage stability of the overall insulation systems.

Abstract: A slot-closing device for closing a slot in a stator or a rotor of an electric machine includes a closure element for closing the slot. A closure element for closing the slot contains a ferromagnetic material, and has a predetermined bending section along a longitudinal extension direction of the closure element, such that two leg portions disposed at an obtuse angle of less than 180° to one another are connected by the bending section. An adhesive layer designed to harden when heated is disposed on edges of the two leg portions.

Abstract: The present disclosure relates to insulation systems. The teachings thereof may be embodied in an insulation system for an electrical machine. For example, an insulation system may comprise: solid insulation materials; an impregnating resin having oxirane functionalities; a depot accelerator distributed throughout the solid insulation materials; and a catalyst for initiating hardening of the impregnating resin, wherein the catalyst is at least partly in gaseous form under hardening conditions.

Abstract: A slot-closing device for closing a slot in a stator or a rotor of an electric machine includes a closure element which contains a ferromagnetic material. An adhesive layer disposed on the closure element is designed to expand and harden when heated. The adhesive layer contains a thermally activatable blowing agent configured as an expansion element which contains a closed cavity filled with gas.

Abstract: An insulating tape having a tape adhesive comprising at least one tape accelerator. The tape accelerator may be comprised of an imidazole, an imidazole derivative, a pyrazole, a pyrazole derivative, and combinations thereof. The tape is particularly useful for insulation for stator coils of electrical machines.

Abstract: The present disclosure relates to electrical machines. The teachings thereof may be embodied in insulation systems for electrical machines, more particularly in the high-voltage range, for example, in an insulation system for electrical machines including: an insulator comprising a porous insulating material; an impregnator comprising a catalytically or thermally curable resin material having oxirane functionalities, or a mixture of different reactive resin materials having oxirane functionalities; and at least one thermally activatable or encapsulated hardener material.

Abstract: An impregnating resin, e.g., a catalytically hardenable impregnating resin for the conductor of an electrical machine, may include at least one reactive resin mixed with at least one reactive diluent and a hardening catalyst, e.g., for cationic, anionic or coordinate polymerization of the impregnating resin. The properties of the impregnating resin or use thereof may be improved by virtue of the reactive diluent containing a heterocyclic four-membered ring. The impregnating resin may be part of a main insulation of a conductor arrangement, which may in turn be installed in an electrical coil or other electrical machine.

Abstract: The invention relates to a slot sealing compound (7) for an electrical machine that comprises at least one slot (2) with a slot opening (5) for receiving an electrical conductor arrangement (3). Said slot sealing compound (7) contains a magnetic filler material, particularly a soft-magnetic filler material, and a reactive resin mixture that comprises at least one resin component. In the interests of improving storage stability for said slot sealing compound (7), the components thereof are selected to be suitable for cationic polymerisation. A catalyst, provided to accelerate the cationic polymerisation of said reactive resin mixture, is also added to said slot sealing compound (7).

Abstract: The invention relates to a slot sealing material (7) for an electric machine, which for accommodating an electric conductor arrangement (3) comprises at least one slot (2) having a slot opening (5). Said slot sealing material contains a magnetic filler, especially a soft-magnetic filler, and a reaction resin mixture comprising at least one resin component and a curing agent component. To improve the temperature resistance and mechanical strength of the slot sealing material, a dianhydride is used as curing agent component.

Abstract: The invention relates to a method for producing a rotor and/or a stator of a dynamoelectric rotary machine by means of the following steps:—producing pre-formed coils from an integral electrically conductive material or pre-insulated or coated electrically conductive wires,—fixing spacers to the pre-formed coil at predefinable intervals,—inserting the pre-formed coil, which is provided with spacers, into slots in a laminated core of a stator or rotor,—making contact with the individual pre-formed coils to form groups of coils and forming a winding system of a rotor and/or stator in accordance with a predefined circuit plan,—insulating the pre-formed coils or the winding system in the slots by complete encapsulation, in particular by complete vacuum encapsulation.