Electric Insulation System of an Electric Motor, and Associated Manufacturing Process
Various embodiments of the teachings herein include an electric insulation system of an electric motor comprising a conductor with a wire winding in a slot of a laminated core of a stator of the electric motor. Wires in the conductor are potted by impregnating resin on and in a carrier. The carrier is loaded with impregnating resin and is arranged between the winding wires in the conductor. Cavities of the conductor are filled with the impregnating resin. The impregnating resin provides potting for the cavities in the conductor of the laminated core.
1 . An electric insulation system of an electric motor, the system comprising:
a conductor with a wire winding in a slot of a laminated core of a stator of the electric motor;
wherein wires in the conductor are potted by impregnating resin on and in a carrier;
wherein the carrier is loaded with impregnating resin and is arranged between the winding wires in the conductor;
wherein cavities of the conductor are filled with the impregnating resin;
wherein the impregnating resin provides potting for the cavities in the conductor of the laminated core.
2 . The insulation system as claimed in claim 1 , wherein the carrier comprises prepreg fibers.
3 . The insulation system as claimed in claim 2 , wherein the prepreg fibers comprise intermingled fibrils.
4 . The insulation system as claimed in claim 2 , wherein the prepreg fibers comprise plastic fibers.
5 . The insulation system as claimed in claim 2 , wherein the prepreg fibers comprise glass fibers.
6 . The insulation system as claimed in claim 2 , wherein the prepreg fibers comprise felts.
7 . The insulation system as claimed in claim 2 , wherein the prepreg fibers are dimensionally matched.
8 . The insulation system as claimed in claim 2 , wherein the prepreg fibers comprise a mixture of fibers of different lengths.
9 . The insulation system as claimed in claim 2 , wherein the prepreg fibers comprise a mixture of fibers of different materials.
10 . The insulation system as claimed in claim 1 , wherein up to 35% by vol of impregnating resin and carrier are present in the conductor.
11 . The insulation system as claimed in claim 2 , wherein the conductor comprises volume fractions of prepreg carrier to winding wire at maximum 5% by vol of prepreg fiber to 1% by vol of winding wire.
12 . An electric insulation system of an electric motor, the system comprising:
a wire winding as conductor in slots of a laminated core
wherein the wire winding and a carrier in the conductor are embedded in a potting compound;
wherein the potting compound in the conductor is distributed uniformly around the wires and the carrier because the impregnating resin for this purpose is not guided into the conductor from the outside, but rather by means of the carriers which are loaded with impregnating resin in the B state and which remain with the winding wires in the winding.
13 . A method for manufacturing an electric insulation system of an electric motor, the method comprising:
winding a conductor including winding wire and impregnating resin carriers;
drawing the conductor into slots of a laminated core of a stator of the electric motor; and
curing the impregnated winding wire/carrier insulation.
14 . The process as claimed in claim 13 , further comprising, between the drawing-in of the conductor and the curing,
heating up the stator to a temperature at which the prepreg impregnating resin in and on the impregnating resin carrier melts and is uniformly distributed into the adjacent intermediate spaces of the individual winding wires in the slot.
15 . The process as claimed in claim 13 , wherein the impregnating resin is uniformly distributed between the winding wires of the conductor and within the slot at least partially via capillary forces.