CN107689701A - There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal - Google Patents
There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal Download PDFInfo
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- CN107689701A CN107689701A CN201711037916.4A CN201711037916A CN107689701A CN 107689701 A CN107689701 A CN 107689701A CN 201711037916 A CN201711037916 A CN 201711037916A CN 107689701 A CN107689701 A CN 107689701A
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- magnetic conduction
- magnetic
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- grain
- oriented
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
- H02K3/493—Slot-closing devices magnetic
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The present invention, which discloses one kind, grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal, 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, reach the effect for reducing leakage magnetic flux and influenceing with the characteristic for having grain-oriented Si steel sheet magnetic property related to rolling direction, its own structure disclosure satisfy that the requirement of structure stiffness and the requirement of steam turbine generator air gap electromagnetic power.
Description
Technical field：
The present invention relates to one kind grain-oriented Si steel sheet magnetic conduction sheet 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 one kind grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal, can reach and change
The distribution of kind air-gap field, reduce the amplitude of air gap flutter component, reduce the purpose of flutter component loss, overcome conventional structure
Magnetic slot-seal increases the drawbacks of leakage magnetic flux component, can apply on large turbo-type generator, reduces stray loss, structural strength
Magnetic pull caused by large turbo-type generator can be resisted to act on, have grain-oriented Si steel sheet magnetic conduction sheet magnetic groove using the present invention
Wedge, the loss of generator can be reduced, reduce temperature rise, generator efficiency is improved, extend generator service life.
The technical scheme is that：One kind has grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal, by there is grain-oriented Si steel sheet material
Magnetic conduction sheet (1) closed assembly form slot wedge magnetic conduction main body, its shape is identical with slot wedge section, but appearance and size is broken less than slot wedge
There is the flange (2) exposed to slot wedge top surface face, upper end, there is the rolling direction and slot wedge top surface of the magnetic conduction sheet of grain-oriented Si steel sheet material
Vertically；Magnetic conduction sheet (1) is arranged alternately closed assembly with glass wool cloth pad (3), and magnetic conduction sheet (1) and glass wool cloth pad (3) have chi
Very little to pass through punching with position identical punching, epoxy glass fabric laminated rod (4), galss fiber reinforced resin protective layer (5) will be led
Magnetic sheet (1), glass wool cloth pad (3), epoxy glass fabric laminated rod (4) cladding turn 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, air gap harmonic amplitude is dropped as caused by stator slot effect
Low, the stray loss thus brought also reduces, and improves the temperature rise reduction of generator, efficiency；The shape of magnetic conduction sheet is broken with slot wedge
Face is identical, and appearance and size is less than slot wedge section, galss fiber reinforced resin protective layer is coated on the periphery of magnetic conduction sheet, rises
To insulating effect, avoid producing circulation loss, loss can be reduced using silicon steel sheet manufacture, section configuration can make itself and its
Electromagnetic force caused by its structure is delivered to the dovetail slot position of stator tooth, avoids galss fiber reinforced resin protective layer from bearing to shear
And cause to be broken, 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
Because the cladding of galss fiber reinforced resin causes temperature rise too high；Have that the magnetic property of grain-oriented Si steel sheet is relevant with rolling direction,
It is high along rolling direction magnetic conductivity, it is low with the magnetic conductivity of rolling direction vertical direction, due to there is the magnetic conduction sheet of grain-oriented Si steel sheet material
Rolling direction it is vertical with slot wedge top surface, power generator air gap main flux direction is also vertical with slot wedge top surface, makes making for magnetic slot-seal
It is enhanced with effect；Horizontal leakage magnetic flux direction is parallel with slot wedge top surface, the permeability relative reduction of magnetic slot-seal, mitigates and uses
The stator leakage flux increase phenomenon that magnetic slot-seal is brought；There is glass wool cloth pad to avoid producing electricity between magnetic conduction sheet between magnetic conduction sheet
Shortness of breath road, eddy-current loss is reduced, glass wool cloth pad can also adsorb epoxy resin, strengthen magnetic conduction sheet and combine between each other, increase
Strong slot wedge bulk strength；Magnetic conduction sheet, glass wool cloth pad are connected into by the epoxy glass fabric laminated rod through punching as rivet
It is integrated, bulk strength is improved, and whole slot wedge is met the needs of generator is to slot wedge stiffness, while is played insulation and made
With avoiding producing electric eddy-current loss between magnetic conduction sheet and stator iron-core lamination.
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 glass wool cloth pads.
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：One kind has grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal, by there is the magnetic conduction of grain-oriented Si steel sheet material
The closed assembly of piece 1 forms the magnetic conduction main body of slot wedge, and its shape is identical with slot wedge section, but appearance and size is less than slot wedge section, and upper end has
Exposed to the flange 2 of slot wedge top surface, there is the rolling direction of the magnetic conduction sheet of grain-oriented Si steel sheet material vertical with slot wedge top surface；Magnetic conduction sheet
1 is arranged alternately closed assembly with glass wool cloth pad 3, and magnetic conduction sheet 1 and glass wool cloth pad 3 have size and position identical punching,
Epoxy glass fabric laminated rod 4 passes through punching, and magnetic conduction sheet 1, glass wool cloth are padded 3, epoxy by galss fiber reinforced resin protective layer 5
The cladding of glass fabric layer pressure bar 4 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, comparison diagram 4 and Fig. 5, it can be seen that technical solution of the present invention
Air gap flux density fluctuating range decreases, and thus reaches the effect for reducing stray loss, and Fig. 6 is contrast chart, and A is conventional art
The air gap waveform of structure, the air gap waveform that B is structure of the present invention, can more intuitively find out that the change of air gap flux density amplitude becomes
Gesture, air gap harmonic amplitude is minimized as caused by stator slot effect, and the stray loss thus brought also reduces, and makes generator
Temperature rise reduction, efficiency improve；The shape of magnetic conduction sheet is identical with slot wedge section, and appearance and size is less than slot wedge section, makes glass fibers
Dimension reinforced resin protective layer can be coated on the periphery of magnetic conduction sheet, play insulating effect, avoid producing circulation loss, using silicon steel
Piece manufacture can reduce loss, and section configuration can make the electromagnetic force of itself and other structures transmission be delivered to the dove tail of stator tooth
Groove location, galss fiber reinforced resin protective layer is avoided to bear to shear and cause to be broken, upper end is exposed to the convex of slot wedge top surface
Heat energy caused by itself can be directly delivered to air gap by edge, avoid the cladding due to galss fiber reinforced resin from causing temperature rise
It is high；Have that the magnetic property of grain-oriented Si steel sheet is relevant with rolling direction, it is high along rolling direction magnetic conductivity, with rolling direction vertical direction
Magnetic conductivity it is low, the rolling direction of the magnetic conduction sheet of grain-oriented Si steel sheet material is vertical with slot wedge top surface due to having, power generator air gap master
Flow direction is also vertical with slot wedge top surface, is enhanced the using effect of magnetic slot-seal；Horizontal leakage magnetic flux direction and slot wedge top
Face is parallel, the permeability relative reduction of magnetic slot-seal, mitigates the stator leakage flux brought using magnetic slot-seal and increases phenomenon；Magnetic conduction
There is glass wool cloth pad to avoid producing electric short circuit between magnetic conduction sheet between piece, reduce eddy-current loss, glass wool cloth pad also may be used
To adsorb epoxy resin, strengthen magnetic conduction sheet and combine between each other, strengthen slot wedge bulk strength；Through the epoxy glass cloth of punching
Pressure bar turns into rivet and is integrally formed magnetic conduction sheet, glass wool cloth pad connection, and bulk strength is improved, and meets whole slot wedge
Generator plays insulating effect to the demand of slot wedge stiffness, avoids producing electricity between magnetic conduction sheet and stator iron-core lamination
Gas eddy-current loss.
Claims (1)
1. one kind has grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal, it is characterized in that：By there is the magnetic conduction sheet of grain-oriented Si steel sheet material (1) folded
Dress forms the magnetic conduction main body of slot wedge, and its shape is identical with slot wedge section, but appearance and size is less than slot wedge section, and upper end, which has, to be exposed to
The flange (2) of slot wedge top surface, there is the rolling direction of the magnetic conduction sheet of grain-oriented Si steel sheet material vertical with slot wedge top surface；Magnetic conduction sheet (1)
Closed assembly is arranged alternately with glass wool cloth pad (3), magnetic conduction sheet (1) and glass wool cloth pad (3) have size and position identical
Punching, epoxy glass fabric laminated rod (4) pass through punching, and galss fiber reinforced resin protective layer (5) is by magnetic conduction sheet (1), glass fiber
Cloth pad (3), epoxy glass fabric laminated rod (4) cladding turn into overall structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711037916.4A CN107689701A (en) | 2017-10-31 | 2017-10-31 | There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711037916.4A CN107689701A (en) | 2017-10-31 | 2017-10-31 | There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal |
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| Publication Number | Publication Date |
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| CN107689701A true CN107689701A (en) | 2018-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711037916.4A Pending CN107689701A (en) | 2017-10-31 | 2017-10-31 | There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617343A (en) * | 2018-12-20 | 2019-04-12 | 麦克奥迪（厦门）电气股份有限公司 | A kind of iron core packaging method enhanced using composite material |
Citations (3)
| 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 |
| CN2794018Y (en) * | 2005-05-31 | 2006-07-05 | 苏州巨峰绝缘材料有限公司 | High-strength and thermal-insulative grooved wedge with high magnetic permeability |
| CN1949406A (en) * | 2005-10-10 | 2007-04-18 | 四川大学 | Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof |
-
2017
- 2017-10-31 CN CN201711037916.4A patent/CN107689701A/en active Pending
Patent Citations (3)
| 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 |
| CN2794018Y (en) * | 2005-05-31 | 2006-07-05 | 苏州巨峰绝缘材料有限公司 | High-strength and thermal-insulative grooved wedge with high magnetic permeability |
| CN1949406A (en) * | 2005-10-10 | 2007-04-18 | 四川大学 | Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617343A (en) * | 2018-12-20 | 2019-04-12 | 麦克奥迪（厦门）电气股份有限公司 | A kind of iron core packaging method enhanced using composite material |
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Application publication date: 20180213 |