CN103427572A - Moisture-proof technology of stator coil ends - Google Patents
Moisture-proof technology of stator coil ends Download PDFInfo
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- CN103427572A CN103427572A CN201310338430XA CN201310338430A CN103427572A CN 103427572 A CN103427572 A CN 103427572A CN 201310338430X A CN201310338430X A CN 201310338430XA CN 201310338430 A CN201310338430 A CN 201310338430A CN 103427572 A CN103427572 A CN 103427572A
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- stator coil
- epoxy resin
- coil end
- resin glue
- curing
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Abstract
The invention relates to a moisture-proof technology of a stator coil end. When a stator coil is subjected to semi-curing at the temperature of 180-200 DEG C, the end of the stator coil is coated with epoxy resin adhesive while coil inserting, then the outer edge of the end of the stator coil is bound with an alkali-free glass fiber ribbon immediately, and finally integral curing at the temperature of 155 DEG C is performed. Density of the epoxy resin adhesive is that a volume ratio between epoxy resin and a curing agent is 2:1. The main material used in the technology is the epoxy resin adhesive, so that the stator coil end has the advantages of heat resistance, high insulation, corrosion resistance, low moisture absorption and the like. The surface of the end of the stator coil is bound with the alkali-free glass fiber ribbon, so that fire resistance and tensile strength of the coil are improved.
Description
Technical field
The present invention relates to a kind of moistureproof technique of stator coil end of hydraulic generator.
Background technology
The stator coil of stator coil, especially hydraulic generator, adopt 180 ℃～200 ℃ semi-solid preparation techniques to make usually.So-called semi-solid preparation, the straight line portion only referred to coil carries out hot molded curing, end is without mould pressing process, also without the curing temperature of 180 ℃～200 ℃, just after rolling off the production line and connecing operation and complete, with the integrally curing of 155 ℃ of whole stator experience, therefore, the epoxy glue overflow state of cure of the overhang insulation layer of stator coil is incomplete, causes overhang insulation layer density not high, moisture-sensitive.If stator coil end is also carried out to the hot press method the same with straight line portion simultaneously, required hot pressing die is very complicated, from the economy aspect, considers, may without practicality.
Summary of the invention
It is not high that the present invention mainly solves original stator coil end insulating barrier density, the technical problem of moisture-sensitive, a kind of moistureproof technique of stator coil end that improves fixed subcoil insulating performance, fire protecting performance and Tensile strength is provided, greatly improves the quality of insulation of motor.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: the moistureproof technique of stator coil end of the present invention, described stator coil adopts 180 ℃～200 ℃ semi-solid preparation techniques, described stator coil is when carrying out semi-solid preparation technique, while rolling off the production line at described stator coil end brushwork epoxy resin glue, then immediately at stator coil end outside wrapping alkali-free glass fibre band, finally enter the integrally curing of 155 ℃.
As preferably, the thick dilution of described epoxide-resin glue is: the volume ratio of epoxy resin and curing agent is 2:1.
The invention has the beneficial effects as follows: the main material that the present invention uses is epoxide-resin glue, thereby has the characteristics such as thermal endurance, high-insulativity, corrosion resistance and moisture absorption are few.The stator coil end appearance is wrapped up with the alkali-free glass fibre silk ribbon again, improves fire protecting performance and the Tensile strength of coil.
The accompanying drawing explanation
Fig. 1 is a kind of structural representation of traditional stator coil end.
Fig. 2 is a kind of structural representation after stator coil end brushwork epoxy resin glue in the present invention.
Fig. 3 is a kind of structural representation of wrapping up again after stator coil end brushwork epoxy resin glue in the present invention after the alkali-free glass fibre band.
Fig. 4 is a kind of cross section structure schematic diagram of stator coil end in the present invention.
1. straight line portioies in figure, 2. mica insulation band layer, 3. epoxy glue layer, 4. alkali-free glass fibre band layer, 5. wire.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: the moistureproof technique of the stator coil end of the present embodiment, first modulating epoxy resin glue, the thick dilution of epoxide-resin glue is: the volume ratio of epoxy resin and curing agent is 2:1.Then in wrapping, there is the stator coil end of mica insulation band layer to carry out the brushing of epoxide-resin glue, requirement on program, must brush while rolling off the production line, therefore, thick dilution and curing rate to epoxide-resin glue have higher requirement, and epoxide-resin glue is too thick, difficult operation, unshapeliness, also brush not in place; Epoxide-resin glue is too rare, and layer is too thin, and easily barring.Curing rate during the epoxide-resin glue modulation requires also very high, and curing time is too short, and operating personnel have had little time whole procedure; Curing time is oversize, also uncured when entering lower road colligation operation, will affect the insulating barrier quality.Epoxide-resin glue completes before whole stator solidifies for the second time in the brushing of stator coil end, so, when solidifying for the second time, surface of stability epoxide-resin glue how; Secondly, stator coil is when the motor actual motion, and end can be subject to electric power and impact, and running time one is long, and the epoxide-resin glue on surface will crack, and reduces coil insulation.For solving this two problems, adopted when brushwork epoxy resin glue, immediately at outside wrapping alkali-free glass fibre band, both stablized surperficial epoxide-resin glue, fire protecting performance and the Tensile strength of end have been improved again, especially when solidifying for the second time, due to the heat-shrinkable of alkali-free glass fibre band, can make the epoxide-resin glue gap of removing to fill the former insulating barrier in end initiatively, improve dielectric strength.
Fixing and the local dielectric that epoxide-resin glue generally is applied to conductor as a kind of insulating material more damages in renovation technique.Utilize the characteristics such as the high plasticity changed between the insulating properties, liquid or solid of epoxide-resin glue, rigidity when solid-state and corrosion resistance, be applied in the insulation property reinforcement process of stator coil end, solve that overhang insulation layer density is not high, the defect of moisture-sensitive, greatly improve the quality of insulation of motor.Utilize the immobilization material of alkali-free glass fibre band as epoxide-resin glue, the characteristics such as pull resistance after the insulating properties of alkali-free glass fibre band, heat-shrinkable, fire line and dipping lacquer all are applied in the end manufacture craft of stator coil, both meet the insulating requirements of end winding, fully demonstrated again its economy and operation practicality.
The stator coil end moisture-proof construction completed through the moistureproof technique of stator coil end, as shown in Figure 1, Figure 2, Figure 3 and Figure 4, comprise stator coil, stator coil has straight line portion 1 and end, the stator coil end innermost layer is wire 5, and wire has dressed outside mica insulation band layer 2, and the 2 outer painting of mica insulation band layer are brushed with epoxy glue layer 3, be covered in the whole appearance of end winding, epoxy glue layer is wrapped up alkali-free glass fibre band layer 4 is arranged again outward.
The insulation property of the stator coil that the stator coil integral insulation performance completed through the moistureproof technique of stator coil end and traditional manufacture craft complete relatively, the quantizating index improved is: stator coil end is placed in to humidity and reaches 80%～85% medium (generally adopting the towel parcel end of corresponding humidity), insulating resistance value is enhanced about more than once, and is not less than 2500M Ω; DC break down voltage leakage current values under three times of rated voltages is less than 30%, not higher than 10 μ A.
Claims (2)
1. the moistureproof technique of a stator coil end, described stator coil adopts 180 ℃～200 ℃ semi-solid preparation techniques, it is characterized in that described stator coil is when carrying out semi-solid preparation technique, while rolling off the production line at described stator coil end brushwork epoxy resin glue, then immediately at stator coil end outside wrapping alkali-free glass fibre band, finally enter the integrally curing of 155 ℃.
2. the moistureproof technique of stator coil end according to claim 1, it is characterized in that the thick dilution of described epoxide-resin glue is: the volume ratio of epoxy resin and curing agent is 2:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310338430.XA CN103427572B (en) | 2013-08-06 | 2013-08-06 | The moistureproof technique of stator coil end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310338430.XA CN103427572B (en) | 2013-08-06 | 2013-08-06 | The moistureproof technique of stator coil end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103427572A true CN103427572A (en) | 2013-12-04 |
| CN103427572B CN103427572B (en) | 2016-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310338430.XA Active CN103427572B (en) | 2013-08-06 | 2013-08-06 | The moistureproof technique of stator coil end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753262A (en) * | 2015-03-26 | 2015-07-01 | 西安微电机研究所 | Moisture-resisting protective method of big seat number split type variable rotary winding and iron core |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06284654A (en) * | 1993-03-25 | 1994-10-07 | Fuji Electric Co Ltd | Insulation treatment method of winding for high voltage electric rotating machine |
| CN1819408A (en) * | 2006-01-23 | 2006-08-16 | 株洲时代新材料科技股份有限公司 | Insulating structure and production for vacuum-pressure immersing process of high-voltage motor |
| CN201570357U (en) * | 2009-11-12 | 2010-09-01 | 杭州钱江电气集团股份有限公司 | Amorphous alloy transformer and low-voltage coil structure thereof |
| CN101882844A (en) * | 2010-06-30 | 2010-11-10 | 上海电气电站设备有限公司 | Stator coil end encapsulating and fixing method |
| CN103066777A (en) * | 2012-12-13 | 2013-04-24 | 哈尔滨电气动力装备有限公司 | Large alternating current motor stator winding head technology capable of preventing impregnating resin from being lost |
-
2013
- 2013-08-06 CN CN201310338430.XA patent/CN103427572B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06284654A (en) * | 1993-03-25 | 1994-10-07 | Fuji Electric Co Ltd | Insulation treatment method of winding for high voltage electric rotating machine |
| CN1819408A (en) * | 2006-01-23 | 2006-08-16 | 株洲时代新材料科技股份有限公司 | Insulating structure and production for vacuum-pressure immersing process of high-voltage motor |
| CN201570357U (en) * | 2009-11-12 | 2010-09-01 | 杭州钱江电气集团股份有限公司 | Amorphous alloy transformer and low-voltage coil structure thereof |
| CN101882844A (en) * | 2010-06-30 | 2010-11-10 | 上海电气电站设备有限公司 | Stator coil end encapsulating and fixing method |
| CN103066777A (en) * | 2012-12-13 | 2013-04-24 | 哈尔滨电气动力装备有限公司 | Large alternating current motor stator winding head technology capable of preventing impregnating resin from being lost |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753262A (en) * | 2015-03-26 | 2015-07-01 | 西安微电机研究所 | Moisture-resisting protective method of big seat number split type variable rotary winding and iron core |
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| CN103427572B (en) | 2016-03-16 |
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