Insulation material preliminary product and insulation material

1. An electrical insulation material precursor for electrical resistance with high thermal conductivity, comprising:

a sheetlike core layer laminate having two outer sides, the core layer laminate including at least the following interconnected layers:

polyester nonwoven,

polyester film, and

polyester nonwoven; and

a layer of resin on the two outer sides of the core layer laminate, the resin being at a B-stage and having a weight fraction of boron nitride within a range of 10% to 20%, thermal conductivity of the layer of resin being greater, by a factor of 3-5, than thermal conductivity of the resin without boron nitride,

wherein the polyester film has a thickness in a range from 25 μm to 350 μm, wherein the polyester nonwovens have a thickness in a range from 25 μm to 130 μm, and

wherein the layers of the core layer laminate are joined with an adhesive which has a weight fraction of at least 1% of boron nitride.

2. The electrical insulation material precursor as claimed in claim 1 , wherein a material of the polyester film of the core layer laminate features an addition with a weight fraction of at least 1% of boron nitride.

3. The electrical insulation material precursor as claimed in claim 1 , wherein the resin layer on each of the two outer sides has a thickness in a range from 8 μm to 50 μm.

4. The electrical insulation material precursor as claimed in claim 1 , wherein the resin is an epoxy resin.

5. The electrical insulation material precursor as claimed in claim 1 , wherein the polyester film is formed between the polyester nonwoven films.

6. The electrical insulation material of claim 1 , wherein the adhesive forms a continuous bond between at least two of the layers of the core layer laminate.

7. An electrical insulation material precursor for electrical resistance with high thermal conductivity, comprising:

a sheetlike core layer laminate with at least the following interconnected layers:

polyester nonwoven,

polyester film, and

polyester nonwoven; and

a layer of resin on two outer sides of the core layer laminate, the resin being at a B-stage and having a weight fraction of boron nitride within a range of 10% to 20%, thermal conductivity of the resin being greater, by a factor of 3-5, than the resin without boron nitride,

wherein the polyester film has a thickness in a range from 25 μm to 350 μm, wherein the polyester nonwovens have a thickness in a range from 25 μm to 130 μm,

wherein the layers of the core layer laminate are joined with an adhesive which has a weight fraction of at least 1% of boron nitride, and

wherein the polyester film is arranged adjacent to each of the polyester nonwovens.

8. The electrical insulation material precursor as claimed in claim 7 , wherein a material of the polyester film of the core layer laminate features an addition with a weight fraction of at least 1% of boron nitride.

9. The electrical insulation material precursor as claimed in claim 7 , wherein a resin layer on each of the two outer sides has a thickness in a range from 8 μm to 50 μm.

10. The electrical insulation material precursor as claimed in claim 7 , wherein the resin is an epoxy resin.

11. The electrical insulation material precursor as claimed in claim 7 , wherein the polyester film is formed between the polyester nonwoven films.

12. Method of producing an electrical insulation material for electrical resistance with high thermal conductivity, comprising:

providing an electrical insulation material precursor having a sheet like core layer laminate with at least the following interconnected layers:

polyester nonwoven,

polyester film, and

polyester nonwoven; and

a layer of resin on two outer sides of the core layer laminate, the resin being at a B-stage and having a weight fraction of boron nitride within a range of 10% to 20%, thermal conductivity of the resin being greater, by a factor of 3-5, than thermal conductivity of the resin without boron nitride, wherein the polyester film has a thickness in a range from 25 μm to 350 μm, wherein the polyester nonwovens have a thickness in a range from 25 μm to 130 μm, wherein the layers of the core layer laminate are joined with an adhesive which has a weight fraction of at least 1% of boron nitride; and

temporarily heating the insulation material precursor to a baking temperature.

13. An electric motor, comprising:

a hollow-cylindrical stator which extends along a line and which, on a radial inner wall, has a plurality of stator slots which are arranged predominantly parallel to the line, and within which sections of a conductor of an electrical stator winding of the electric motor are arranged; and

the sections of the conductor being enveloped by an electrical insulation material for electrical resistance with high thermal conductivity, the electrical insulation material having a sheet like core layer laminate with at least the following interconnected layers:

polyester nonwoven,

polyester film, and

polyester nonwoven; and

a layer of resin on two outer sides of the core layer laminate, the resin being at a B-stage and having a weight fraction of boron nitride within a range of 10% to 20%, thermal conductivity of the resin being greater, by a factor of 3-5, than thermal conductivity of the resin without boron nitride,

wherein the polyester film has a thickness in a range from 25 μm to 350 μm, wherein the polyester nonwovens have a thickness in a range from 25 μm to 130 μm, and

wherein the layers of the core layer laminate are joined with an adhesive which has a weight fraction of at least 1% of boron nitride.

14. The electrical insulation material precursor as claimed in claim 13 , wherein a material of the polyester film of the core layer laminate features an addition with a weight fraction of at least 1% of boron nitride.