METHOD AND STATOR FOR OPTIMIZED SLOT BASE INSULATION

Abstract

A method is provided for producing a slot base insulation in a stator (210, 220), wherein the stator (210, 220) is part of an electrical machine and is constructed from a ferromagnetic material. The stator (210, 220) is provided with at least one slot (204) to fit a winding wire (122) in the at least one slot (204). The at least one slot (204) is coated with a soft-magnetic insulation material. A stator (210, 220) also is provided with the slot base insulation.

Claims

1. A method for producing a slot base insulation in a stator, wherein the stator is part of an electrical machine and is constructed from a ferromagnetic material, in which method the stator is provided with at least one slot to arrange a winding wire in the at least one slot, the method comprising coating the at least one slot with a soft-magnetic insulation material.

2. The method of claim 1, wherein the coating is carried out to coat at least one edge at at least one end of the slot with the soft-magnetic insulation material.

3. The method of claim 2, wherein the soft-magnetic insulation material is a lacquer formed from a liquid component that is admixed with soft-magnetic particles, and the method further comprising curing the liquid component after coating of the at least one slot.

4. The method of claim 3, wherein the liquid component is selected from a group consisting of enamels, polyimides, polyamides, epoxides.

5. The method of claim 1, wherein a lacquer is selected as the soft-magnetic insulation material, the lacquer being a pulverulent mixture of soft-magnetic particles and resin-like particles, and wherein the method further comprises carrying out a curing process after coating.

6. The method of claim 5, the curing process is carried out by heating.

7. The method of claim 2, wherein the soft-magnetic insulation material comprises soft-magnetic particles with ferrimagnetic properties.

8. The method of claim 1, wherein the soft-magnetic insulation material comprises soft-magnetic particles with ferrimagnetic properties.

9. The method of claim 1, further comprising adding highly thermally conductive particles to the soft-magnetic insulation material for coating.

10. A stator with a slot base insulation, wherein the stator is part of an electrical machine and is constructed from a ferromagnetic material, wherein the stator has at least one slot for receiving winding wire and the slot base insulation is implemented using the method of claim 1.

11. The stator of claim 10, wherein the stator has a plurality of stator segments that are stacked one above the other and each have at least one slot, wherein the at least one slot of each stator segment is provided with the slot base insulation.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 schematically shows parts of a stator with insulation paper from the prior art.

[0029] FIG. 2 schematically shows stator segments which are coated with insulation material in accordance with one embodiment of the method according to the invention.

DETAILED DESCRIPTION

[0030] FIG. 1 schematically shows parts 110, 120, 130 of a stator of an electrical machine with insulation paper 104 from the prior art 100. A respective slot 102 in an upper stator half 110 or a lower stator half 120 or of a stator segment 130 is lined, in accordance with the prior art, with insulation paper 104, for example provided by and separated from an insulation paper roll 140, for insulation from a respective winding wire 122.

[0031] FIG. 2 schematically shows stator segments 210, 220, which are coated with insulation material, in accordance with one embodiment 200 of the method according to the invention. The two stator segments 210, 220 shown were coated with a soft-magnetic insulation material which is provided according to the invention in the respective slot 204 and on the respective side surfaces 202 before assembly to form the stator of an electrical machine. A polymer matrix of the soft-magnetic insulation material can be formed, for example, on the basis of 3M 5230N epoxy for powder coating. However, this would be suitable only for electrical machines which do not heat up to further than class F which is a range of between approximately 130 C. and 155 C. here. As an alternative, the use of SolEpoxy DK15EG-05 is also conceivable. According to the invention, soft-magnetic particles are then admixed with said epoxy and the stator segments 210, 220 which form the slot 204 are coated with this soft-magnetic insulation material and, for example, sealed by baking. The side surfaces 202 can also selectively be coated in the process. However, it is also conceivable to perform the coating of the respective slot 204 only after the stator segments, that is to say stator segments 210 or stator segments 220, have been stacked one on the other, wherein the respective stator segments 210, 220 can advantageously be mounted at a relatively small distance in relation to one another without coating of the side surfaces 202.