Formulation for producing an insulating system, electrical machine and method for producing an insulating system

1. A sprayable formulation for an insulation system of an electrical machine, the formulation comprising a sprayable resin mixture including:

a diepoxidic carbon-based first resin component; and

a second resin component based on alkyl-/arylpolysiloxane with at least one glycidyl ester and/or glycidyl ether functionality; and

a curing agent based on at least one of: anhydride, (poly)amine, and amino- and/or alkoxy-functional alkyl-/arylpolysiloxane.

2. The formulation as claimed in claim 1 , wherein the formulation is in solid form at room temperature and/or standard pressure and therefore sprayable as a powder coating.

3. The formulation as claimed in claim 1 , wherein the formulation is in liquid form at room temperature and/or standard pressure.

4. The formulation as claimed in claim 3 , further comprising a solvent.

5. The formulation as claimed in claim 3 , comprising no solvent.

6. The formulation as claimed in claim 1 , further comprising a second curing agent including a di- and/or trianhydride and/or one or more derivatives thereof.

7. The formulation as claimed in claim 1 , further comprising a second curing agent including a difunctional and/or higher-functionality amine and/or one or more derivatives thereof.

8. The formulation as claimed in claim 1 , further comprising one or more filler fractions.

9. The formulation as claimed in claim 1 , further comprising a nanoparticulate filler fraction and an additive.

10. The formulation as claimed in claim 9 , wherein the additive provides at least partial sintering of nanoparticles in the nanoparticulate filler fraction to form a barrier layer in the event of electrical partial discharges.

11. An electrical rotating machine comprising:

a conductor;

a lamination stack;

an insulation system including a main insulation;

an internal potential controller; and

an outer corona shield and/or a terminal corona shield;

wherein the insulation system includes a formulation comprising a cured resin mixture including:

a diepoxidic carbon-based first resin component; and

a second resin component based on alkyl-/arylpolysiloxane with at least one glycidyl ester and/or glycidyl ether functionality; and

a curing agent based on at least one of: anhydride, (poly)amine, and amino- and/or alkoxy-functional alkyl-/arylpolysiloxane.

12. A method for producing an insulation system of an electrical rotating machine, the method comprising:

spraying a resin mixture including:

a monomeric and/or oligomeric, at least diepoxidic carbon-based first resin component; and

a monomeric and/or oligomeric second resin component based on alkyl-/arylpolysiloxane with at least one glycidyl ester and/or glycidyl ether functionalities; and

a curing agent and based on at least one of: anhydride, (poly)amine, and amino- and/or alkoxy-functional alkyl-/arylpolysiloxane; and

curing the resin mixture.

13. A method for producing an insulation system of an electrical rotating machine, the method comprising:

producing a formulation comprising a sprayable resin mixture including:

a monomeric and/or oligomeric, at least diepoxidic carbon-based first resin component; and

a monomeric and/or oligomeric second resin component based on alkyl-/arylpolysiloxane with at least one glycidyl ester and/or glycidyl ether functionalities; and

a curing agent and based on at least one of: anhydride, (poly)amine, and amino- and/or alkoxy-functional alkyl-/arylpolysiloxane;

spraying the formulation onto a conductor;

drying and/or partly gelating the formulation on the conductor;

repeating spraying and drying and/or partly gelating; and

curing the formulation to form the insulation.