CN219163036U

CN219163036U - Winding wire for stator winding of high-power wind driven generator

Info

Publication number: CN219163036U
Application number: CN202223484019.7U
Authority: CN
Inventors: 郑一帆; 顾新梅; 朱丹华
Original assignee: Suzhou Guanlong Electromagnetic Wire Co ltd
Current assignee: Suzhou Guanlong Electromagnetic Wire Co ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-09
Anticipated expiration: 2032-12-23

Abstract

The winding wire for the high-power wind driven generator stator winding comprises a copper conductor, a first insulating layer, a second insulating layer and a third insulating layer, wherein the first insulating layer is a polyamide imide paint film layer solidified on the outer wall of the copper conductor, the second insulating layer is a single-sided polyimide less-glue calcined mica tape wound on the outer side of the first insulating layer, the third insulating layer is a single-sided polyimide less-glue calcined mica tape which is burnt on the reinforcing surface of the outer side of the second insulating layer and coated with hot melt adhesive, the stacking rate of the second insulating layer and the third insulating layer during winding is 0%, the reinforcing surface of the single-sided polyimide less-glue calcined mica tape in the third insulating layer faces outwards, good corona resistance and good sealing performance can be realized, the reinforcing surface of the third insulating layer is coated with hot melt adhesive and faces outwards, the winding wire has self-adhesive performance, the path of the main insulating paint entering the insulating layer can be shortened when a coil is embedded into a main insulating core to be immersed, and the phenomenon of air-out is difficult to occur.

Description

Winding wire for stator winding of high-power wind driven generator

Technical Field

The utility model relates to the technical field of stator windings of wind driven generators, in particular to a winding wire for a stator winding of a high-power wind driven generator.

Background

Under the global double-carbon strategy, the wind power generation market is increased year by year, through the development of years, the wind power generation has two major development trends, namely, the development from land to sea is carried out, the development from single machine low power to single machine high power is carried out, the main current model of the wind power generator is 6-10 MW, the development is 13-15 MW, the wind power generator with higher power provides higher requirements on the performance of a stator winding, and the winding wire for manufacturing the stator winding is required to have better corona resistance, sealing performance and self-adhesion performance.

Most of the existing winding wires for stator windings are polyimide fluorine 46 composite film lapped and sintered copper flat wires, 180-grade or above varnished glass fiber reinforced plastic lapped and enameled copper flat wires and the like, the winding wires have poor corona resistance and no self-adhesion performance, and the winding wires need to be bonded by using inter-turn gel materials when being manufactured into coils in the later stage; the polyimide film sintering and polyester film reinforced mica tape lapped copper flat wire, the polyimide film sintering and reinforced mica tape lapped copper flat wire are also used as winding wires, but after the winding wires are used for a long time, the sealing performance can be gradually lost due to the moisture absorption of polyimide, so that the copper conductor is subjected to oxidation corrosion.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a winding wire for a stator winding of a high-power wind driven generator, which has good corona resistance, good sealing performance and self-adhesion performance.

In order to achieve the above purpose, the technical scheme provided by the utility model is that the winding wire for the stator winding of the high-power wind driven generator comprises a copper conductor with a rectangular cross section and an insulating layer arranged on the outer wall of the copper conductor, wherein the insulating layer comprises a first insulating layer, a second insulating layer and a third insulating layer which are sequentially arranged from inside to outside, the first insulating layer is a polyamide imide paint film layer solidified on the outer wall of the copper conductor, the second insulating layer is a single-sided polyimide few-glue calcined mica tape wound on the outer side of the first insulating layer, and the third insulating layer is a single-sided polyimide few-glue calcined mica tape which is burnt on the outer side of the second insulating layer and is coated with hot melt adhesive by a reinforcing surface; the stacking rate of the second insulating layer and the third insulating layer during wrapping is 0%, and the reinforcing surface of the single-sided polyimide less-adhesive calcined mica tape in the third insulating layer faces outwards.

Preferably, the double-sided insulation thickness of the first insulation layer is 0.12-0.17mm, the double-sided insulation thickness of the second insulation layer and the third insulation layer is 0.15-0.18mm,

preferably, the total dry area ration of the single-sided polyimide less-glue calcined mica tape in the second insulating layer and the third insulating layer is 135g/m ² 。

Preferably, the nominal content of the hot melt adhesive on the reinforcing surface of the single-sided polyimide low-adhesive calcined mica tape in the third insulating layer is 1.8%.

Preferably, the stitch spacing of the second insulating layer during wrapping is less than or equal to 0.1mm; and the stitch space of the third insulating layer during wrapping is less than or equal to 0.5mm.

Further preferably, the wrapping direction of the second insulating layer and the third insulating layer is the same when wrapping, and the overlapping seams of the second insulating layer and the third insulating layer are staggered by 50% ± 10% of the bandwidth.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the single-sided polyimide few-glue calcined mica tape is wound into the second insulating layer and the third insulating layer, and the high-frequency pulse resistance characteristic of the single-sided polyimide few-glue calcined mica tape can be utilized to realize better corona resistance.

2. The polyamide imide paint film layer is adopted as the first insulating layer closest to the outer wall of the copper conductor, so that an effective sealing effect can be achieved on the copper conductor, and the characteristic that the polyamide imide does not absorb moisture can be utilized, so that good sealing performance is still achieved after long-time use.

3. The single-sided polyimide less-adhesive calcined mica tape with the reinforcing surface coated with the hot melt adhesive is adopted as the third insulating layer at the outermost side, and the reinforcing surface is outwards enabled to enable the winding wire to have self-adhesive performance, and when the winding wire is manufactured into a coil in the later stage, the winding wire is not required to be bonded by using inter-turn gelling materials, so that the material cost and the time cost of inter-turn gelling are reduced.

4. The second insulating layer and the third insulating layer adopt a wrapping mode with the wrapping rate of 0%, when the coil embedded iron core is manufactured to be immersed in main insulating paint, the path of the main insulating paint entering the insulating layer can be shortened, so that the main insulating paint is easier to soak, and the phenomenon of air-out is difficult to occur.

Drawings

Fig. 1 is a schematic longitudinal section of a preferred embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of a preferred embodiment of the present utility model.

Wherein: 10. a copper conductor; 11. arc chamfering; 21. a first insulating layer; 22. a second insulating layer; 23. and a third insulating layer.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model will be more readily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.

As shown in fig. 1 and 2, the winding wire for the stator winding of the high-power wind driven generator provided by the utility model comprises a copper conductor 10 with a rectangular cross section and an insulating layer arranged on the outer wall of the copper conductor 10, wherein the copper conductor 10 is made of copper with the marks of T1, T2, TU1 and TU2 in GB/T3952, the cross section of the copper conductor 10 is rectangular, the nominal thickness a of the copper conductor 10 is 4.50mm, the nominal width b of the copper conductor is 9.50mm, arc-shaped chamfers with the radius of 1.00mm are arranged at four corners of the cross section of the copper conductor, the insulating layer comprises a first insulating layer 21, a second insulating layer 22 and a third insulating layer 23 which are sequentially arranged from inside to outside, the first insulating layer 21 is a polyamide imide paint film layer solidified on the outer wall of the copper conductor 10, the second insulating layer 22 is a single-sided polyimide less-glue calcined mica tape wrapped on the outer side of the first insulating layer 21, and the third insulating layer 23 is a single-sided polyimide less-glue calcined mica tape coated with hot melt glue; specifically, the stacking rate of the second insulating layer 22 and the third insulating layer 23 during wrapping is 0%, and the reinforcing surface of the single-sided polyimide low-glue calcined mica tape in the third insulating layer 23 faces outwards.

The advantages of this arrangement are that:

In this embodiment, the bilateral insulation thickness of the first insulation layer 21 is 0.15mm, and when the first insulation layer 21 is provided, the first insulation layer 21 is formed on the outer wall of the copper conductor 10 by using the self-leveling property of the polyamideimide paint in a manner of coating and radiation drying for many times on the outer wall of the copper conductor 10; the bilateral insulation thickness of the second insulation layer and the third insulation layer is 0.18mm, so that the bilateral insulation thickness of the insulation layer is in the design range of 0.41-0.61 mm.

Used for the second insulating layer 22 and the third insulating layer 23The single-sided polyimide calcined mica tape with less gum had the same nominal thickness of 0.09mm, with a nominal basis weight of 43g/m for the polyimide film ² The nominal basis weight of the mica paper is 80g/m ² Nominal basis weight of adhesive is 12g/m ² The total dry area basis of the mica tape was 135g/m ² The performance index requirements are as follows: the dielectric strength is more than or equal to 60MV/m, the tensile strength is more than or equal to 40N/10mm, and the elongation at break is more than or equal to 50%; the nominal content of the single-sided polyimide low-glue calcined mica tape reinforcing surface coated hot melt adhesive in the third insulating layer 23 is 1.8%.

During wrapping, the stitch pitch (pitch of adjacent tape edges) of the second insulating layer 22 is 0.1mm or less; the stitch interval of the third insulating layer during wrapping is less than or equal to 0.5mm, the wrapping direction of the second insulating layer 22 and the third insulating layer 23 is the same, and the stitch of the second insulating layer 22 and the third insulating layer 23 is staggered by 50% +/-10% of the bandwidth.

The performance parameters of this embodiment are as follows:

the above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a high-power wind-driven generator stator winding is with winding wire, is in including the cross section for rectangular copper conductor and setting insulating layer on the copper conductor outer wall, the insulating layer includes from inside to outside first insulating layer, second insulating layer and the third insulating layer that sets gradually, its characterized in that:

the first insulating layer is a polyamide imide paint film layer solidified on the outer wall of the copper conductor, the second insulating layer is a single-sided polyimide less-glue calcined mica tape wrapped on the outer side of the first insulating layer, and the third insulating layer is a single-sided polyimide less-glue calcined mica tape coated with hot melt adhesive on the reinforcing surface wrapped on the outer side of the second insulating layer;

the stacking rate of the second insulating layer and the third insulating layer during wrapping is 0%, and the reinforcing surface of the single-sided polyimide less-adhesive calcined mica tape in the third insulating layer faces outwards.

2. The winding wire for stator windings of a high-power wind turbine according to claim 1, wherein: the bilateral insulation thickness of the first insulation layer is 0.12-0.17mm, and the bilateral insulation thickness of the second insulation layer and the third insulation layer is 0.15-0.18mm.

3. The winding wire for stator windings of a high-power wind turbine according to claim 1, wherein: the total dry area ration of the single-sided polyimide less-glue calcined mica tape in the second insulating layer and the third insulating layer is 135g/m ² 。

4. The winding wire for stator windings of a high-power wind turbine according to claim 1, wherein: the overlapping seam spacing of the second insulating layer during wrapping is less than or equal to 0.1mm; and the stitch space of the third insulating layer during wrapping is less than or equal to 0.5mm.

5. The winding wire for stator windings of a high-power wind turbine according to claim 4, wherein: the wrapping direction of the second insulating layer and the wrapping direction of the third insulating layer are the same, and the overlapping seams of the second insulating layer and the third insulating layer are staggered by 50% +/-10% of the bandwidth.