Insulation, electrical machine, and method for producing the insulation
Various embodiments include a sprayable formulation for production of a multilayer insulation for an electrical machine, especially a rotating electrical machine in the high-voltage or mid-voltage sector, for example a generator, transformer, which is subjected to higher rated voltages at operating voltages, i.e., for example, over and above 1 kV or more. The invention also relates to an electrical machine comprising such an insulation; the invention finally relates to a method of producing the multilayer insulation. This comprises spraying of various formulations with or without intermediate, especially metallic, interfaces and is automatable.
1. An insulation for a conductor of an electrical rotating machine, said insulation comprising:
two or more layers produced by spraying lacquer formulations;
wherein a first layer comprises a mechanically supporting lacquer layer; and
a second layer adjoining the first layer includes a partial discharge-resistant lacquer layer;
at least partly alternating, full-area lacquer layers in radial direction around the conductor; and
an ultrathin layer as interface for formation of a lacquer layer in the electrostatic powder coating spray method.
2. The insulation as claimed in claim 1 , wherein the second layer comprises a sprayable lacquer formulation, a resin mixture, or a resin-curing agent mixture including: a monomeric and/or oligomeric resin component based on silicon oxide, siloxane, silazane, vinyl, silane/vinyl, silane/acrylate and/or silane/methacrylate.
3. The insulation as claimed in claim 1 , wherein the first layer comprises a sprayable lacquer formulation having a resin mixture or a resin-curing agent mixture composed of a carbon-based compound.
4. The insulation as claimed in claim 1 , comprising multiple alternately applied partial discharge-resistant and mechanically supporting lacquer layers.
5. The insulation as claimed in claim 1 , wherein the layers are produced by spraying a lacquer formulation as powder coating.
6. The insulation as claimed in claim 1 , wherein the layers are produced by spraying a liquid lacquer formulation with solvent.
7. The insulation as claimed in claim 1 , wherein the layers are produced by spraying a liquid lacquer formulation without solvent.
8. The insulation as claimed in claim 1 , wherein the ultrathin layer comprises one or more atomic layers of metal as interface.
9. The insulation as claimed in claim 1 , further comprising a continuous layer structure composed of a mechanically supporting layer with intervening partial discharge-resistant lacquer layers in the form of an intermittent lacquer layer and distributed in a scale design.