Insulation System, Including a Polymer Blend
Various embodiments of the teachings herein include an insulation system. An example includes a polymer blend in the form of a solid two-dimensional insulation material, a material for wire insulation by means of extrusion and/or an injection-molded and/or compression-molded article. The blend is resistant to partial discharges and at least partly replaces any mica content in the insulation system. The blend comprises at least three blend partners including at least one copolymer based on polyetherimide and siloxane blended with at least two high-temperature thermoplastics. At least of one the high-temperature thermoplastics is in semicrystalline form, such that spherulites are detectable in the polymer blend.
1 . An insulation system comprising:
a polymer blend in the form of a
solid two-dimensional insulation material,
material for wire insulation by means of extrusion and/or an
injection-molded and/or compression-molded article;
wherein the polymer blend is resistant to partial discharges, and at least partly replaces any mica content in the insulation system and
wherein the polymer blend comprises at least three blend partners including at least one copolymer based on polyetherimide and siloxane blended with at least two high-temperature thermoplastics; and
at least one of the high-temperature thermoplastics is in semicrystalline form, such that spherulites are detectable in the polymer blend.
2 . The insulation system as claimed in claim 1 , where each of the at least three blend partners is present in the polymer blend in a proportion of 1% to 70% by weight.
3 . The insulation system as claimed in claim 1 , wherein one of the at least three blend partners comprises a polyetherimide PEI.
4 . The insulation system as claimed in claim 1 , wherein one of the at least three blend partners comprises a polyetheretherketone.
5 . The insulation system as claimed in claim 1 , wherein the polymer blend forms a film and/or a laminate.
6 . The insulation system as claimed in claim 1 , wherein the polymer blend includes a sulfur-containing polymer.
7 . The insulation system as claimed in claim 6 , wherein the sulfur-containing polymer component is present in the polymer blend in an amount of up to 25% by weight.
8 . The insulation system as claimed in claim 1 , wherein the blend partners are all present in roughly the same proportions by mass.
9 . The insulation system as claimed in claim 1 , wherein the at least one copolymeric polymer blend component has the greatest number of parts by mass in the polymer blend.
10 . The insulation system as claimed in claim 1 , wherein a PEK component has the greatest number of parts by mass in the polymer blend.
11 . The insulation system as claimed in claim 1 , wherein a PEI component has the greatest number of parts by mass in the polymer blend.
12 . The insulation system as claimed in claim 6 , wherein the sulfur-containing polymer component has the greatest number of parts by mass in the polymer blend.
13 . The insulation system as claimed in claim 1 , wherein a proportion of silicon atoms in the range from 1% to 25%, based on all atoms in the copolymer, is present in the copolymer in the forms of polyetherimides and siloxanes.
14 . The insulation system as claimed in claim 1 , wherein the polymer blend includes an oxidation-inhibiting additive.
15 . A method as recited in claim 21 , further comprising:
using the polymer blend in a wire extrusion as part-conductor insulation or winding insulation and/or as main insulation in hairpin windings; and
fixing the polymer blend by encapsulation, impregnation, trickle impregnation, dipping and/or injection molding.
16 . The method as recited in claim 21 , further comprising using the polymer blend in an injection molding method for production of an electrical main insulation or parts of an electrical main insulation of a stator of an electric motor or generator.
17 . The method as recited in claim 21 , further comprising using the polymer blend in a compression molding method for production of an electrical insulation and/or parts of an electrical insulation of a stator of an electric motor or generator.
18 . The method as recited in claim 21 , further comprising use the polymer blend as laminate or film for production of at least part of an insulation system with impregnation by vacuum pressure impregnation.
19 . The method as recited in claim 21 , further comprising using the polymer blend as groove lining for the insulation of a stator of an electric motor or generator.
20 . An electrical machine comprising:
a stator with an electrical insulation system;
wherein the electrical insulation system includes a polymer blend;
wherein the blend is resistant to partial discharges, and at least partly replaces any mica content in the insulation system, and the polymer blend comprises at least three blend partners including at least one copolymer based on polyetherimide and siloxane blended with at least two high-temperature thermoplastics, and at least one of the high-temperature thermoplastics is in semicrystalline form, such that spherulites are detectable in the polymer blend.
21 . A method comprising:
use of a polymer blend in an insulation system;
wherein the polymer blend is resistant to partial discharges, and at least partly replaces any mica content in the insulation system, and the polymer blend comprises at least three blend partners including at least one copolymer based on polyetherimide and siloxane blended with at least two high-temperature thermoplastics, and at least one of the high-temperature thermoplastics is in semicrystalline form, such that spherulites are detectable in the polymer blend.