CN107546897A - Non-woven fabrics strengthens magnetic slot-seal - Google Patents
Non-woven fabrics strengthens magnetic slot-seal Download PDFInfo
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- CN107546897A CN107546897A CN201711037809.1A CN201711037809A CN107546897A CN 107546897 A CN107546897 A CN 107546897A CN 201711037809 A CN201711037809 A CN 201711037809A CN 107546897 A CN107546897 A CN 107546897A
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- magnetic
- magnetic conduction
- slot wedge
- woven fabrics
- slot
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Abstract
The present invention discloses a kind of non-woven fabrics enhancing magnetic slot-seal, sheet magnetic conduction unit can reduce itself eddy-current loss, the distribution of the magnetic line of force in stator slot can be changed, harmonic wave intensity is set to decrease, reaching reduces the effect of harmonic loss, non-woven fabrics enhancing structure disclosure satisfy that the requirement of structure stiffness and the requirement of steam turbine generator air gap electromagnetic power, and reaching reduces the miscellaneous consumption of generator, improves efficiency, improves generator performance index, improves the purpose of reliability.
Description
Technical field：
The present invention relates to a kind of non-woven fabrics to strengthen magnetic slot-seal.
Background technology：
Generator stator core, which need to slot, inlays stator winding, due to the difference of magnetic property, makes air-gap field distribution production
Changing, the flutter component being distributed along air gap is formed, eddy-current loss is produced on generator amature surface, be the miscellaneous consumption of generator
Main component；The phenomenon had both produced loss, declined generator efficiency, also causes rotor surface overheat, adds generator
Temperature rise, influence the output and insulation life of generator；Loss caused by flutter component and generator rated speed, stator slot
The factors such as number, void dimension are related, and these key parameters are often what is determined by generator master-plan, with generator techniques
Parameter is related, and for some designs, such as the design of large turbo-type generator, particularly number of stator slots, less electromagnetic scheme, past
Toward contradiction as generation：I.e. the loss of flutter component, which exceeds, is expected, and reduces the efficiency of generator；And take increase stator slot
The technical scheme of number or increase void dimension, although the loss of flutter component can be reduced, adds manufacturing cost or increasing
Big excitation loss, also changes alternator performance parameter.
For the problem, often solves the problem using magnetic slot-seal on middle and small motor, magnetic slot-seal can increase
The magnetic property at stator rabbet position, to reduce the amplitude of air gap flutter component, and to reduce loss caused by flutter component；But
There is also deficiency for the technology：Although being the amplitude that magnetic slot-seal can reduce air gap flutter component first, leakage field is also increased
Reduction of fractions to a common denominator amount, bring and be lost and reduce motor performance, this problem is must be balanced against on slot wedge magnetic property, is otherwise difficult to reach pre-
Phase effect；On the other hand, the structure design of slot wedge, selection and manufacturing technology are also immature, are such as molded magnetic slot-seal, magnetic lamination
Slot wedge, Yin order magnetic slot-seal, the magnetic filling slot wedge etc. of plate processing, actually reach performance and fall flat, and magnetic
The alternate stress that slot wedge is acted on by rotor magnetic pull, fatigue problem is produced, the damage phenomenon that comes off often occur, cause to run thing
Therefore；Particularly in terms of large turbo-type generator, magnetic pull problems in role is more prominent, so that still no at present apply magnetic
Property slot wedge technology；Although large turbo-type generator electromagnetic load is very high, compact-sized, ventilating and cooling is limited, and reduces spuious damage
Consumption is particularly important for improving generator performance index, but the utilization of magnetic slot-seal technology is limited the problems such as reliability,
So that large turbo-type generator reduces stray loss technology and is difficult to break through.
The content of the invention：
It is an object of the invention to provide a kind of non-woven fabrics to strengthen magnetic slot-seal, can reach the distribution for improving air-gap field,
Reduce the amplitude of air gap flutter component, reduce the purpose of flutter component loss, overcome conventional structure magnetic slot wedge increase leakage field
It the drawbacks of reduction of fractions to a common denominator amount, can apply on large turbo-type generator, reduce stray loss, structural strength can resist large-scale steamer
Magnetic pull caused by generator acts on, and strengthens magnetic slot-seal using the non-woven fabrics of the present invention, can reduce loss, the drop of generator
Low-temperature-rise, generator efficiency is improved, extend generator service life.
The technical scheme is that：A kind of non-woven fabrics strengthens magnetic slot-seal, and leading for slot wedge is formed by magnetic conduction sheet (1) closed assembly
Magnetic main body；Magnetic conduction sheet (1) is by punching silicon-steel, and width dimensions are less than groove width and height dimension is less than the rectangle knot of slot wedge thickness
There is the flange (2) exposed to slot wedge top surface structure, upper end, there is nonwoven fabric mat (3) between adjacent magnetic conduction sheet (1), its shape with
Slot wedge section is identical, but appearance and size is less than slot wedge section, and magnetic conduction sheet (1), nonwoven fabric mat (3) have size identical with position
Punching, epoxy glass fabric laminated rod (4) passes through punching, and the longitudinally reinforced layer of non-woven fabrics (5) coats the side and bottom surface of slot wedge, ring
Oxygen resin protective layer (6) is by magnetic conduction sheet (1), nonwoven fabric mat (3), epoxy glass fabric laminated rod (4), the longitudinally reinforced layer of non-woven fabrics
(5) cladding turns into overall structure.
Technique effect：
Traditional non magnetic slot wedge is substituted using the present invention in stator of steam turbine generator, magnetic conduction sheet forms the magnetic conduction of slot wedge
Main body, the magnetic property at stator rabbet position is set to increase, magnetic conductivity is close to stator teeth, as caused by stator slot effect
Air gap harmonic amplitude is minimized, and the stray loss thus brought can also reduce, and proposes the temperature rise reduction of generator, efficiency
It is high；Magnetic conduction sheet can reduce loss using silicon steel sheet manufacture, because the width dimensions of magnetic conduction sheet are less than groove width, make itself and stator
Non-magnetic gap is formed between tooth, obstruction is produced to horizontal leakage magnetic flux, mitigates the stator leakage flux brought using magnetic slot-seal and increases
Big phenomenon；Nonwoven fabric mat shape is identical with slot wedge section, but appearance and size is less than slot wedge section, can make slot wedge as far as possible
Integral anti-shearing shearing stress is enhanced, and and can enough accommodates the longitudinally reinforced layer of non-woven fabrics, strengthens the effect of longitudinal bending strength of slot wedge
Fruit；Heat energy caused by itself can be directly delivered to air gap by the flange exposed to slot wedge top surface of upper end, be avoided due to epoxy
The cladding of resin causes temperature rise too high；There is nonwoven fabric mat to avoid producing electric short circuit between magnetic conduction sheet between adjacent magnetic conduction sheet,
Eddy-current loss is reduced, nonwoven fabric mat can also adsorb epoxy resin, strengthen magnetic conduction sheet and combine between each other, and enhancing slot wedge is overall
Intensity；Magnetic conduction sheet, nonwoven fabric mat connection are integrally formed by the epoxy glass fabric laminated rod through punching as rivet, overall strong
Degree is improved, and nonwoven fabric mat and the longitudinally reinforced layer of non-woven fabrics make epoxy resin protective layer structure be strengthened, and avoid glass
Resin protective layer bears electromagnetic force, and epoxy resin protective layer is by magnetic conduction sheet, nonwoven fabric mat, epoxy glass fabric laminated rod and nonwoven
The longitudinally reinforced layer cladding of cloth turns into overall structure, plays bonding and insulating effect, avoids between magnetic conduction sheet and stator iron-core lamination
Produce electric eddy-current loss.
Brief description of the drawings：
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is section diagrammatic cross-section where magnetic conduction sheet.
Fig. 3 is section diagrammatic cross-section where nonwoven fabric mat.
Fig. 4 is conventional art stator tooth header structure air gap magnetic line of force distribution schematic diagram.
Fig. 5 is technical solution of the present invention air gap magnetic line of force distribution schematic diagram.
Fig. 6 is the present invention and the fluctuation of conventional art air gap flux density and the variation tendency schematic diagram of amplitude.
Embodiment：A kind of non-woven fabrics strengthens magnetic slot-seal, as shown in Figure 1, Figure 2, Figure 3 shows, by the closed assembly structure of magnetic conduction sheet 1
Into the magnetic conduction main body of slot wedge；Magnetic conduction sheet 1 is by punching silicon-steel, and width dimensions are less than groove width and height dimension is less than slot wedge thickness
There is the flange 2 exposed to slot wedge top surface rectangular configuration, upper end, has nonwoven fabric mat 3, nonwoven interlining between adjacent magnetic conduction sheet 1
Pad 3 is using carbon fiber nonwoven fabric and glass fibre non-woven or the manufacture of other high strength fibre cloth, its shape and slot wedge section
It is identical, but appearance and size is less than slot wedge section, and magnetic conduction sheet 1, nonwoven fabric mat 3 have size and position identical punching, epoxy
Glass fabric layer pressure bar 4 passes through punching, and the longitudinally reinforced layer 5 of non-woven fabrics coats the side and bottom surface of slot wedge, and epoxy resin protective layer 6 will
The longitudinally reinforced cladding of layer 5 of magnetic conduction sheet 1, nonwoven fabric mat 3, epoxy glass fabric laminated rod 4, non-woven fabrics turns into overall structure；
Traditional non magnetic slot wedge is substituted using the present invention in stator of steam turbine generator, magnetic conduction sheet forms the magnetic conduction of slot wedge
Main body, the magnetic property at stator rabbet position is set to increase, magnetic conductivity can be seen close to stator teeth, comparison diagram 4 and Fig. 5
Go out, the air gap flux density fluctuating range of technical solution of the present invention decreases, and thus reaches the effect for reducing stray loss, and Fig. 6 is
Chart is contrasted, A is that air gap waveform, the B of conventional art structure are the air gap waveform of structure of the present invention, can more intuitively see outlet
The variation tendency of the close amplitude of gap magnetic, air gap harmonic amplitude must reduce as caused by stator slot effect, the spuious damage thus brought
Consumption also reduces, and improves the temperature rise reduction of generator, efficiency；Magnetic conduction sheet can reduce loss using silicon steel sheet manufacture, due to leading
The width dimensions of magnetic sheet are less than groove width, make itself to form non-magnetic gap between stator tooth, and obstruction is produced to horizontal leakage magnetic flux,
Mitigate the stator leakage flux brought using magnetic slot-seal and increase phenomenon；Nonwoven fabric mat shape is identical with slot wedge section, but profile
Size is less than slot wedge section, is enhanced as far as possible the integral anti-shearing shearing stress of slot wedge, and can enough accommodates non-woven fabrics and indulged
To enhancement layer, strengthen the effect of longitudinal bending strength of slot wedge；The flange exposed to slot wedge top surface of upper end can produce itself
Raw heat energy is directly delivered to air gap, avoids because the cladding of epoxy resin causes temperature rise too high；There is non-woven fabrics between magnetic conduction sheet
Pad avoids producing electric short circuit between magnetic conduction sheet, reduces eddy-current loss, nonwoven fabric mat can also adsorb epoxy resin, strengthen
Magnetic conduction sheet combines between each other, strengthens slot wedge bulk strength；Epoxy glass fabric laminated rod through punching turns into rivet by magnetic conduction
Piece, nonwoven fabric mat connection are integrally formed, and bulk strength is improved, and nonwoven fabric mat and the longitudinally reinforced layer of non-woven fabrics make epoxy
Resin protective layer structure is strengthened, and avoids glass resin protective layer from bearing electromagnetic force, and epoxy resin protective layer is by magnetic conduction sheet, nothing
Spinning cloth pad, epoxy glass fabric laminated rod and the longitudinally reinforced layer cladding of non-woven fabrics turns into overall structure, plays to bond and insulate and makees
With avoiding producing electric eddy-current loss between magnetic conduction sheet and stator iron-core lamination.
Claims (1)
1. a kind of non-woven fabrics strengthens magnetic slot-seal, it is characterized in that：The magnetic conduction main body of slot wedge is made up of magnetic conduction sheet (1) closed assembly；Magnetic conduction
Piece (1) is by punching silicon-steel, and width dimensions are less than groove width and height dimension is less than the rectangular configuration of slot wedge thickness, and upper end has cruelly
The flange (2) of slot wedge top surface is exposed to, has nonwoven fabric mat (3) between adjacent magnetic conduction sheet (1), its shape is identical with slot wedge section,
But appearance and size is less than slot wedge section, magnetic conduction sheet (1), nonwoven fabric mat (3) have size and position identical punching, epoxy glass
Glass cloth laminated rod (4) passes through punching, and the longitudinally reinforced layer of non-woven fabrics (5) coats the side and bottom surface of slot wedge, epoxy resin protective layer
(6) magnetic conduction sheet (1), nonwoven fabric mat (3), epoxy glass fabric laminated rod (4), the longitudinally reinforced layer of non-woven fabrics (5) cladding are turned into
Overall structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711037809.1A CN107546897A (en) | 2017-10-31 | 2017-10-31 | Non-woven fabrics strengthens magnetic slot-seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711037809.1A CN107546897A (en) | 2017-10-31 | 2017-10-31 | Non-woven fabrics strengthens magnetic slot-seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107546897A true CN107546897A (en) | 2018-01-05 |
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ID=60967231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711037809.1A Pending CN107546897A (en) | 2017-10-31 | 2017-10-31 | Non-woven fabrics strengthens magnetic slot-seal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890243A (en) * | 2021-09-16 | 2022-01-04 | 华中科技大学 | Hairpin structure soft magnetic composite material magnetic slot wedge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1513780B2 (en) * | 1966-03-14 | 1975-12-18 | Garbe Lahmeyer & Co Ag, 5100 Aachen | Magnetic locking wedge for open slots in an electrical machine |
| CN1111411A (en) * | 1994-05-05 | 1995-11-08 | 陈启星 | Electric machine with stacked slot wedge of alternated ferromagnetic material and nonmagnetic material |
| CN202160035U (en) * | 2011-03-11 | 2012-03-07 | 西安市美联电气绝缘有限公司 | Double-high laminated magnetic conductive plate |
| WO2016150595A1 (en) * | 2015-03-26 | 2016-09-29 | Siemens Aktiengesellschaft | Self-adhesive slot-closing device for an electric machine |
-
2017
- 2017-10-31 CN CN201711037809.1A patent/CN107546897A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1513780B2 (en) * | 1966-03-14 | 1975-12-18 | Garbe Lahmeyer & Co Ag, 5100 Aachen | Magnetic locking wedge for open slots in an electrical machine |
| CN1111411A (en) * | 1994-05-05 | 1995-11-08 | 陈启星 | Electric machine with stacked slot wedge of alternated ferromagnetic material and nonmagnetic material |
| CN202160035U (en) * | 2011-03-11 | 2012-03-07 | 西安市美联电气绝缘有限公司 | Double-high laminated magnetic conductive plate |
| WO2016150595A1 (en) * | 2015-03-26 | 2016-09-29 | Siemens Aktiengesellschaft | Self-adhesive slot-closing device for an electric machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890243A (en) * | 2021-09-16 | 2022-01-04 | 华中科技大学 | Hairpin structure soft magnetic composite material magnetic slot wedge |
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