Electrical insulation system of an electric motor and production method for said electrical insulation system
Various embodiments include an electrical insulation system for an electric motor comprising: a laminated core having slots and wire windings; an surface electrical insulation in the slots surrounding individual wires with a potting compound; and an absorbent material between the individual wires and within the wire winding bounded by surface insulation material. The absorbent material took up liquid impregnation resin during the manufacturing process. The liquid impregnation resin has cured and now forms the potting compound.
1. An electrical insulation system for an electric motor, the system comprising:
a laminated core having slots and windings including a plurality of individual wires;
an electrical surface insulation material in the slots surrounding individual wires, the electrical surface insulation material including a potting compound; and
an absorbent material distributed between the individual wires and within the slots and bounded by the electrical surface insulation material;
wherein an amount of the absorbent material is selected to maximize the amount of absorbent material present in a slot while a number of the individual wires in a respective slot is equal to a maximum possible number of individual wires in the slot if no absorbent material were present;
wherein the absorbent material comprises a foam and/or a fiber acting as a sponge and swelling upon contact with a liquid impregnation resin during a manufacturing process; and
wherein the liquid impregnation resin has cured and now forms the potting compound.
2. The insulation system as claimed in claim 1 , wherein the absorbent material comprises a foam.
3. The insulation system as claimed in claim 1 , wherein the absorbent material comprises fibers.
4. The insulation system as claimed in claim 1 , wherein the absorbent material comprises endless fibers.
5. The insulation system as claimed in claim 1 , wherein the absorbent material comprises long fibers.
6. The insulation system as claimed in claim 1 , wherein the absorbent material comprises fibers wound with the winding wires to form a conductor.
7. The insulation system as claimed in claim 1 , wherein a proportion of absorbent material in a respective slot is in the range of up to 26% of the total volume in the respective slot.
8. The insulation system as claimed in claim 1 , wherein the absorbent material comprises fibers that have been at least partially surface treated.
9. The insulation system as claimed in claim 1 , wherein the absorbent material comprises fibers that have been surface treated with adhesive.