CN107769405A - Staggeredly closed assembly generator unit stator tooth header structure - Google Patents
Staggeredly closed assembly generator unit stator tooth header structure Download PDFInfo
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- CN107769405A CN107769405A CN201711053986.9A CN201711053986A CN107769405A CN 107769405 A CN107769405 A CN 107769405A CN 201711053986 A CN201711053986 A CN 201711053986A CN 107769405 A CN107769405 A CN 107769405A
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- tooth head
- stator
- groove
- tooth
- generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The present invention discloses a kind of closed assembly generator unit stator tooth header structure that interlocks, and stator core replaces closed assembly by two kinds of structure tooth head shapes punchings and formed；The first structure tooth head shapes is that tooth head surface (1) has v-shaped structure groove (2), and the both sides of v-shaped structure groove (2) are the first arc surface (4) overlapped with stator core inner circle (3)；Second of structure tooth head shapes is that tooth head surface (1) has semicircular structure groove (5), and the both sides of semicircular structure groove (5) are the second arc surface (6) overlapped with stator core inner circle (3).The present invention can change the distribution of the magnetic line of force in stator air gap, harmonic wave intensity is set to decrease, reaching reduces the effect of harmonic loss, ventilation eddy-current loss can be also reduced simultaneously, reduce windage, 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 closed assembly generator unit stator tooth header structure that interlocks.
Background technology：
Generator stator core, which need to slot, inlays stator winding, because stator core tooth magnetic conductivity is good and groove inner part is led
Magnetic difference, the air-gap field of former Sine distribution is set to addition of harmful flutter component, flutter component produces on generator amature surface
Raw added losses, it is the important component of generator amature added losses；The phenomenon had both produced loss, declined generator efficiency,
Also so that rotor surface heating increase even causes hot-spot, influence generator output and reduce insulation life；Flutter component
The key parameters such as the added losses of initiation and generator rated speed, number of stator slots, void dimension are related, and these key parameters
Often determined by generator master-plan, be related to the quality of generator techniques parameter so that generator techniques parameter and pulsation
The added losses that component triggers are one group of difficult contradiction reconciled：By taking the design of large turbo-type generator as an example, particularly stator slot
The less electromagnetic scheme of number, the added losses that flutter component triggers, which exceed, is expected, and reduces the efficiency of generator, and takes increase
Number of stator slots or the technical scheme for increasing void dimension, although the loss of flutter component can be reduced, add and are manufactured into
This increases excitation loss, also changes alternator performance parameter.
For the problem, magnetic slot-seal is often used on middle and small motor, magnetic slot-seal can increase stator slot oral area
The magnetic property of position, it is lost to reduce the amplitude of air gap flutter component, reduce caused by flutter component.But magnetic slot-seal technology
Shortcomings：First, although magnetic slot-seal can reduce the amplitude of flutter component in air-gap field, but leakage field point is added
Amount, cause other added losses and reduce generator electric property, therefore the selection in magnetic slot-seal magnetic conductivity must be balanced against this and ask
Topic, is otherwise difficult to produce a desired effect；Secondly, the selection of magnetic slot-seal and manufacturing technology are still immature, exist after practical application
The risk to fall flat, and easily there is machine under the alternate stress effect that the effect of rotor magnetic pull triggers in magnetic slot-seal
Tool fatigue, or even occur coming off cause damage generator cella accident；Particularly in terms of large turbo-type generator, magnetic pull is made
It is more prominent with problem, so that still there is no applied magnetic slot wedge technology at present；Finally, although large turbo-type generator electromagnetism
Load is very high, and structure is extremely compact, but by ventilating and cooling energy power restriction, reduces performance of the added losses to raising generator
Index is particularly important, but the utilization of magnetic slot-seal technology is limited the problems such as reliability so that by using magnetic slot-seal technology
Improve large turbo-type generator added losses to be difficult to break through.
The content of the invention：It is an object of the invention to provide a kind of closed assembly generator unit stator tooth header structure that interlocks, it 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, can apply large-scale
On steam turbine generator, stray loss is reduced, the potential safety hazard using magnetic slot-seal will not be brought, the damage of generator can be reduced
Consumption, temperature rise is reduced, improve generator efficiency, extend generator service life.
The technical scheme is that：A kind of closed assembly generator unit stator tooth header structure that interlocks, stator core is by two kinds of structures
Tooth head shapes punching alternating closed assembly forms；The first structure tooth head shapes is that tooth head surface (1) has v-shaped structure groove (2), V-arrangement
The both sides of texture grooves (2) are the first arc surface (4) overlapped with stator core inner circle (3)；Second of structure tooth head shapes be
Tooth head surface (1) has semicircular structure groove (5), and the both sides of semicircular structure groove (5) are to be overlapped with stator core inner circle (3)
The second arc surface (6).
Technique effect：
The technical program stator core replaces closed assembly by two kinds of structure tooth head shapes punchings and formed；The first structure tooth capitiform
Shape is that tooth head surface has v-shaped structure groove, and the both sides of v-shaped structure groove are the first arc surface overlapped with stator core inner circle；
Second of structure tooth head shapes is that tooth head surface has a semicircular structure groove, and the both sides of semicircular structure groove are and stator core
The second arc surface that inner circle overlaps, makes tooth head centre lack part permeability magnetic material, adds the magnetic resistance of the position, force this
Place's part magnetic line of force is diverted to tooth head both sides position, causes the magnetic line of force degree of saturation at tooth head both sides position to improve, tooth head both sides
The magnetic line of force degree of saturation at position improves the distribution that can then change the magnetic line of force in stator slot, makes the increase of magnetic flux in stator slot；
So being provided with stator tooth head position after the groove of v-shaped structure and the groove of semicircular structure, stator tooth head position, determine
The magnetic flux distribution of pilot trench oral area position and corresponding air gap can change, i.e., one originally complete tooth head magnetic flux crest distribution
Two magnetic flux crest distributions can be split into, play the effect of increase stator tooth slot number amount, the magnetic flux in stator slot to a certain extent
In the presence of amount increase, the magnetic flux crest of tooth head position can also reduce with the ratio of magnetic flux trough in stator slot, i.e. harmonic wave intensity
Decrease, equally also reach the effect for reducing harmonic loss；Because the depth for the groove for increasing v-shaped structure can damage harmonic wave
Consumption further reduces, but all can reduce core tooth head mechanical strength using the punching closed assembly stator core of the groove of v-shaped structure,
There are the groove punching of semicircular structure and the punching of the groove of v-shaped structure to replace closed assembly, tooth head table so employing tooth head surface
The groove punching that there is semicircular structure in face has higher structural integrity, core tooth head is met requirement of mechanical strength and can
Enough reach the purpose for making harmonic loss further reduce, groove punching and the v-shaped structure for having semicircular structure using tooth head surface
The punching alternating closed assembly of groove stator core can also be made to form bigger heat-delivery surface, reduce stator core temperature rise；And V-arrangement
The both sides of the groove of structure and the both sides of the groove of semicircular structure are the arc surfaces overlapped with stator core inner circle, Neng Gouyu
Uniform air gap is formed between rotor surface, can also be contacted with slide plate forming face unshakable in one's determination, reduces pressure, meets that support pulls and pushes and turns
The requirement of sub- holding power, avoid damaging stator core inner surface by pressure；Meanwhile the technical scheme can make to flow into out of stator air duct
The cooling gas of air gap is preferably spread, and can also make to obtain from the cooling gas that air gap enters in stator core air duct
Preferably guiding, reduce ventilation eddy-current loss, reduce windage, improve hydro-generator ventilation cooling performance, reduce temperature rise, improve effect
Rate；The groove of v-shaped structure and the groove of semicircular structure is set also to make complete stator tooth head originally in stator tooth head position
Surface becomes two faces, and width diminishes, and the eddy-current loss of stator tooth head surface is decreased；So technical solution of the present invention reaches
Having arrived reduces the amplitude of air gap flutter component using magnetic slot-seal, reduces the effect of flutter component loss, and does not bring increase
The drawbacks of leakage magnetic flux component, also no magnetic slot-seal come off the potential faults of damage, it is special especially suitable for large turbo-type generator
It is not the Large Copacity or vast capacity steam turbine generator, nuclear power generator of internal water cooling, reaching reduces the miscellaneous consumption of generator, improves effect
Rate, improve generator performance index, improve the purpose of reliability.
Brief description of the drawings：
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is conventional art stator tooth header structure flux pulsation and air gap magnetic line of force distribution schematic diagram.
Fig. 3 is the pulsation of technical solution of the present invention air-gap flux and magnetic line of force distribution schematic diagram.
Fig. 4 is using four tooth punching schematic diagrames.
Fig. 5 is using six tooth punching schematic diagrames.
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：As shown in figure 1, the technical scheme is that：Stator core is by two kinds of structure tooth head shapes
Punching alternating closed assembly forms；The first structure tooth head shapes is that tooth head surface 1 has a v-shaped structure groove 2, the two of v-shaped structure groove 2
Side is the first arc surface 4 overlapped with stator core inner circle 3；Second of structure tooth head shapes is that tooth head surface 1 has semicircle knot
Structure groove 5, the both sides of semicircular structure groove 5 are the second arc surface 6 overlapped with stator core inner circle 3；As shown in Fig. 2 with
Tooth head all surfaces toward the stator core of technology are the arc surfaces overlapped with stator core inner circle, are formed between rotor surface
It uniform air gap, can also be contacted with slide plate forming face unshakable in one's determination, reduce pressure, meet that support pulls and pushes the requirement of rotor holding power,
Avoid damaging stator core inner surface by pressure；Because stator core is made up of the good silicon steel sheet of magnetic property, and in stator slot
Stator bar and stator slot wedge are all nonmagnetic substances, and stator magnetic flux is concentrated in stator tooth by and leading in stator slot
The quantity crossed is reduced, and is made the magnetic flux that equally distributed stator magnetic flux formation changes with the regularity of distribution of stator tooth, groove originally, is passed through
Air gap and rotor surface, rotor will cut pulsation magnetic flux relative to stator rotation and produce vortex, produce and be lost and generate heat；According to
Calculate and qualitative analysis, the size of the loss depend on ripple harmonic intensity, i.e. width and air gap value depending on stator tooth head
Ratio, the width of stator tooth head and the more big then ripple harmonic intensity of the ratio of air gap value are higher, loss is bigger, and air gap value is by sending out
Motor electromagnetic designs and mechanical structure determines, although increase air gap value can reduce stray loss, can also increase excitation loss,
Decline generator efficiency, temperature rise improves, or even can not meet EIAJ requirement；Reducing the width of stator tooth head can only take
Increase number of stator slots method, but number of stator slots is also dependent on the electromagnetic design scheme of generator, for a kind of specific cooling
The generator of mode, under certain classical insulation requirement, its number of stator slots is exactly the numerical value of a determination, it is impossible to arbitrarily
Change, so the numerical value that the width of stator tooth head is just to determine substantially；Although can using increase parallel branch number method come
Increase number of stator slots reaches the purpose for reducing stator tooth head width, but the way can increase the dosage of stator bar major insulation, drop
Thorax effective rate of utilization in low stator, the increase of the loss brought can offset the reduction of miscellaneous consumption, not reach expected purpose；It is increased fixed
Sub-line rod quantity also increases considerably manufacturing cost, so only the purpose for increase cooling surface area will not generally adopt
With this way；And the technical program stator core replaces closed assembly by two kinds of structure tooth head shapes punchings and formed；The first structure
Tooth head shapes are that tooth head surface has v-shaped structure groove, and the both sides of v-shaped structure groove are the circular arc overlapped with stator core inner circle
Face；Second of structure tooth head shapes is that tooth head surface has a semicircular structure groove, and the both sides of semicircular structure groove are and stator
The arc surface that iron core inner circle overlaps, makes tooth head centre lack part permeability magnetic material, adds the magnetic resistance of the position, force this
Place's part magnetic line of force is diverted to tooth head both sides position, causes the magnetic line of force degree of saturation at tooth head both sides position to improve, tooth head both sides
The magnetic line of force degree of saturation at position improves the distribution that can then change the magnetic line of force in stator slot, makes the increase of magnetic flux in stator slot,
As shown in Figure 3；So after being provided with v-shaped structure groove and semicircular structure groove in stator tooth head position, stator tooth head
The magnetic flux distribution at position, stator rabbet position and corresponding air gap can change, i.e. one complete tooth head magnetic flux of script
Crest distribution can split into two magnetic flux crest distributions, the effect of increase stator tooth slot number amount be played to a certain extent, in stator
In groove in the presence of magnetic flux increase, the magnetic flux crest of tooth head position can also reduce with the ratio of magnetic flux trough in stator slot, i.e.,
Harmonic wave intensity decreases, and equally also reaches the effect for reducing air gap harmonic loss；Comparison diagram 2 and Fig. 3, it can be seen that this hair
The air gap flux density vibration frequency of bright technical scheme is two times of conventional art, and fluctuating range decreases, and it is miscellaneous thus to reach reduction
The effect of loss is dissipated, Fig. 6 is contrast chart, and A is that air gap waveform, the B of conventional art structure are the air gap waveform of structure of the present invention,
The variation tendency of air gap flux density vibration frequency and amplitude can more intuitively be found out；Because the depth for increasing v-shaped structure groove can
So that harmonic loss further reduces, but all it can reduce core tooth head using the punching closed assembly stator core of v-shaped structure groove
Mechanical strength, there is the punching of semicircular structure groove to replace closed assembly, tooth with the punching of v-shaped structure groove so employing tooth head surface
Head surface has the punching of semicircular structure groove to have higher structural integrity, core tooth head is met requirement of mechanical strength again
The purpose for making harmonic loss further reduce can be reached, groove punching and the V-arrangement knot for having semicircular structure using tooth head surface
The punching alternating closed assembly of the groove of structure can form slit between the adjacent punching of grooved position, can form stator core
Bigger heat-delivery surface, reduce stator core temperature rise；And v-shaped structure groove both sides and semicircular structure groove both sides with
Conventional structure is the same, is the arc surface overlapped with stator core inner circle, uniform air gap can be formed between rotor surface,
It can be contacted with slide plate forming face unshakable in one's determination, reduce pressure, met that support pulls and pushes the requirement of rotor holding power, avoid damaging stator iron by pressure
Endocardial surface；Meanwhile the cooling gas that the technical scheme can make to flow into air gap out of stator air duct is preferably spread,
Also can make preferably to be guided from the cooling gas that air gap enters in stator core air duct, reduction ventilation eddy-current loss,
Windage is reduced, improves hydro-generator ventilation cooling performance, temperature rise is reduced, improves efficiency；Set v-shaped structure recessed in stator tooth head position
Groove and semicircular structure groove also make the complete stator tooth head surface of script become two faces, and width diminishes, and makes stator tooth head
The eddy-current loss on surface decreases, and has reached the effect that conventional art opens narrow slot reduction eddy-current loss in side section core tooth head,
But the core tooth head narrow slot of conventional art can not meet intensity requirement because depth and width ratio limit, it is necessary to using bonding
Measure, the side iron leg heart is can be only applied to, and be unable to reach the effect for changing air-gap field distribution；So technical solution of the present invention reaches
Having arrived reduces the amplitude of air gap flutter component using magnetic slot-seal, reduces the effect of flutter component loss, and does not bring increase
The drawbacks of leakage magnetic flux component, also no magnetic slot-seal come off the potential faults of damage, it is special especially suitable for large turbo-type generator
It is not the Large Copacity or vast capacity steam turbine generator, nuclear power generator of internal water cooling, reaching reduces the miscellaneous consumption of generator, improves effect
Rate, improve generator performance index, improve the purpose of reliability；The technical program can use two kinds of structure punchings to carry out lamination
Construction, but two sets of Lamination moulds are so needed, lamination work progress is also required to two kinds of punching alternating closed assemblies, had both increased and has been manufactured into
Originally construction inconvenience, is also resulted in；For this can be by the tooth punching in a punching into two kinds of structures tooth header structure, be alternately arranged；
Specific embodiment one：As shown in figure 4, using four tooth punchings, each punching has 4 teeth, the first tooth of punching and
The tooth head position of 3rd tooth is provided with v-shaped structure groove, and the second tooth of punching and the tooth head position of the 4th tooth are provided with semicircle
Texture grooves, i.e. odd number gear are v-shaped structure groove, and even number tooth is semicircular structure groove；Adjacent punching during stator lamination stacking
One tooth of relative misalignment, i.e., the odd number gear of the punching of any one are all combined with the even number tooth of adjacent punching, are reached using a kind of
Punching reaches the purpose of two kinds of tooth cephalic groove groove alternating closed assemblies.
Specific embodiment two：As shown in figure 5, using six tooth punchings, each punching has six teeth, and odd number gear is V-arrangement knot
Structure groove, even number tooth are semicircular structure groove；Adjacent three teeth of punching relative misalignment during stator lamination stacking, i.e., any one
The odd number gear of punching all combined with the even number tooth of adjacent punching, reach that to reach two kinds of tooth cephalic groove grooves using a kind of punching alternately folded
The purpose of dress.
Claims (1)
- The closed assembly generator unit stator tooth header structure 1. one kind is interlocked, it is characterized in that：Stator core is by two kinds of structure tooth head shapes punchings Alternately closed assembly forms；The first structure tooth head shapes is that tooth head surface (1) has v-shaped structure groove (2), v-shaped structure groove (2) Both sides are the first arc surface (4) overlapped with stator core inner circle (3)；Second of structure tooth head shapes is that tooth head surface (1) has Semicircular structure groove (5), the both sides of semicircular structure groove (5) are the second arc surface overlapped with stator core inner circle (3) (6)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711053986.9A CN107769405A (en) | 2017-10-31 | 2017-10-31 | Staggeredly closed assembly generator unit stator tooth header structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711053986.9A CN107769405A (en) | 2017-10-31 | 2017-10-31 | Staggeredly closed assembly generator unit stator tooth header structure |
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| Publication Number | Publication Date |
|---|---|
| CN107769405A true CN107769405A (en) | 2018-03-06 |
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| CN201711053986.9A Pending CN107769405A (en) | 2017-10-31 | 2017-10-31 | Staggeredly closed assembly generator unit stator tooth header structure |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014013830A1 (en) * | 2012-07-17 | 2014-01-23 | 日立オートモティブシステムズ株式会社 | Rotary electric machine and electric vehicle |
-
2017
- 2017-10-31 CN CN201711053986.9A patent/CN107769405A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014013830A1 (en) * | 2012-07-17 | 2014-01-23 | 日立オートモティブシステムズ株式会社 | Rotary electric machine and electric vehicle |
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Application publication date: 20180306 |
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