Insulating system made of solid insulating material and impregnating resin
The invention relates generally to the field of insulating electrical conductors against partial discharge in the medium- and high-voltage ranges. In particular, the invention relates to an insulating system for an electric machine, in particular a rotating electric machine such as an electric motor and/or a generator. The invention provides for the first time a substitute for the conventionally used mica as a barrier material in an insulating system, such as the main insulation of rotating electric machines such as motors and/or generators. The substitute is based on a polyether-imide/siloxane copolymer, which can be processed two-dimensionally, for example by surface extrusion. In this way, sheets are produced and, after being processed in sheet form or as a laminate, can be used as planar insulating materials, or cut as strips, in insulating systems.
1. An insulation system comprising:
a solid insulation material in the form of a surface insulation material and a synthetic resin,
wherein the surface insulation material is a copolymer of a polyetherimide with a siloxane, and the synthetic resin is a thermoset with which the surface insulation material is impregnated and subsequently cured in the form of an encapsulation, and
wherein the copolymer comprises an atomic proportion of silicon atoms in the range from 1% to 25%, based on all atoms in the copolymer.
2. The insulation system of claim 1 , wherein the copolymer of the polyetherimide and the siloxane is a block copolymer.
3. The insulation system of claim 1 , wherein the copolymer has a siloxane content in the range from 0.1% by weight to 90% by weight, based on a total weight of the copolymer.
4. The insulation system of claim 1 , wherein the copolymer is according to formula:
in which:
R 1-6 are identical or different and are selected from the group comprising:
substituted or unsubstituted, saturated, unsaturated or aromatic monocycles having 5 to 30 carbon atoms;
substituted or unsubstituted, saturated, unsaturated or aromatic polycycles having 5 to 30 carbon atoms;
substituted or unsubstituted, saturated hydrocarbons having 1 to 30 carbon atoms;
substituted or unsubstituted, unsaturated hydrocarbons having 2 to 30 carbon atoms; or
any combination thereof, and
V is a tetravalent linker group selected from the group comprising:
substituted or unsubstituted, saturated, unsaturated or aromatic monocycles and polycycles having 5 to 50 carbon atoms;
substituted or unsubstituted, saturated hydrocarbons having 1 to 30 carbon atoms;
substituted or unsubstituted, unsaturated hydrocarbons having 2 to 30 carbon atoms; or
any combinations of linker groups comprising at least one of the tetravalent linker groups,
wherein g is 1 to 30, and
wherein d is 2 to 20.
5. The insulation system of claim 1 , wherein the surface insulation material includes one or more additives.
6. The insulation system of claim 1 , wherein the surface insulation material is made from polyetherimide-siloxane copolymer at least in the form of a laminate, a film, a tape, a tape cut from a laminate, or any combination thereof.
7. An apparatus comprising:
an insulation system comprising:
a solid insulation material in the form of a surface insulation material and a synthetic resin,
wherein the surface insulation material is a copolymer of a polyetherimide with a siloxane, and the synthetic resin is a thermoset with which the surface insulation material is impregnated and subsequently cured in the form of an encapsulation, and
wherein the copolymer comprises an atomic proportion of silicon atoms in the range from 1% to 25%, based on all atoms in the copolymer.
8. The apparatus of claim 7 , wherein the surface insulation material is made from polyetherimide-siloxane copolymer at least in the form of a laminate, a film, a tape, a tape cut from a laminate, or any combination thereof.
9. The apparatus of claim 7 , wherein the insulation system is in the medium- and high-voltage range.
10. The apparatus of claim 7 , wherein the surface insulation material is made from polyetherimide-siloxane copolymer at least in the form of a film, a laminate, or the film and the laminate as slot lining.
11. The apparatus of claim 7 ,
wherein the surface insulation material is made from polyetherimide-siloxane copolymer at least in the form of a tape, the tape being a wrapping tape.
12. The apparatus of claim 7 , wherein the copolymer of the polyetherimide and the siloxane is a block copolymer.
13. The apparatus of claim 7 , wherein the copolymer is according to formula:
in which:
R 1-6 are identical or different and are selected from the group comprising:
substituted or unsubstituted, saturated, unsaturated or aromatic monocycles having 5 to 30 carbon atoms;
substituted or unsubstituted, saturated, unsaturated or aromatic polycycles having 5 to 30 carbon atoms;
substituted or unsubstituted, saturated hydrocarbons having 1 to 30 carbon atoms;
substituted or unsubstituted, unsaturated hydrocarbons having 2 to 30 carbon atoms; or
any combination thereof, and
V is a tetravalent linker group selected from the group comprising:
substituted or unsubstituted, saturated, unsaturated or aromatic monocycles and polycycles having 5 to 50 carbon atoms;
substituted or unsubstituted, saturated hydrocarbons having 1 to 30 carbon atoms;
substituted or unsubstituted, unsaturated hydrocarbons having 2 to 30 carbon atoms; or
any combinations of linker groups comprising at least one of the tetravalent linker groups,
wherein g is 1 to 30, and
wherein d is 2 to 20.
14. The apparatus of claim 7 , wherein the surface insulation material includes one or more additives.