CN105048679B - A kind of large ac machines are local to mix transposition stator bar and mixing interchanging method with overall - Google Patents
A kind of large ac machines are local to mix transposition stator bar and mixing interchanging method with overall Download PDFInfo
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- CN105048679B CN105048679B CN201510584258.5A CN201510584258A CN105048679B CN 105048679 B CN105048679 B CN 105048679B CN 201510584258 A CN201510584258 A CN 201510584258A CN 105048679 B CN105048679 B CN 105048679B
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Abstract
The invention discloses a kind of large ac machines part interchanging method is mixed with overall transposition stator bar and the part of mixing with overall；Four column transposition strands of the stator bar are divided into four transposition strand unit groups comprising two column transposition strands, and the overall transposition of each strand unit group that replaces is provided with the unit group insulating barrier for being used for reinforced insulation protection；The interchanging method carries out itself local transposition to the strand in transposition strand unit group first, again overall transposition is carried out between the strand unit group that replaces, the strand that finally replaces continues itself local transposition according to the torsional direction of itself transposition local first, until reaching design transposition angle；This method enables every transposition strand equably to occupy the locus where stator bar, while realizing design transposition angle and reducing circulation loss, moreover it is possible to largely increase pitch of transposition, be easy to Product processing.
Description
Technical field
The present invention relates to large ac machines positioning line rod transposition design and fabrication technology field, and in particular to a kind of large-scale
Alternating current generator part mixes transposition stator bar with entirety and stator bar part mixes interchanging method with overall.
Background technology
The transposition of stator bar strand is a key technical problem in large ac machines electromagnetic design, and stator bar is each
Transposition strand is located in stray field different in groove high scope, and each different interlinked leakages for replacing strand interlinkage produce different leakage inductances
Potential, due to stator bar end by and headgear be welded to connect, form electrical potential difference, each parallel connection in each transposition strand loop
Circulation added losses are produced between strand, the uneven and local problems of excessive heat of temperature rise occurs in bar；There is result of the test to show, it is large-scale
The temperature difference in generator stator bar between strand is larger, so as to reduce the efficiency of generator, has a strong impact on the exhausted of stator winding
In the edge life-span, motor operation safety is threatened, therefore, how strand braiding transposition is just shown so as to be effectively reduced strand circulation loss
Obtain particularly significant.
At present, appropriate torsion braiding transposition typically is carried out to be damaged to bar circulation using tens of transposition strands in parallel
Consumption is suppressed；Positioning line rod transposition structural shape complexity is various, the transposition form used in turbine generator stator bar
There are 360 ° to replace entirely, add several transposition forms such as the 360 ° of transpositions of void transposition section, 360 ° of deficiencies replace, 360 ° of extensions replace, steamer
Because iron core is longer, 540 ° of transpositions of generally use in stator bar, these transposition forms play generator to reducing circulation loss
Good effect；But hydrogenerator, because iron core is short, positioning line rod transposition pitch is short, it is impossible to carry out changing for greater angle
Position；Stator bar of turbo generator can only be on the left side or the right side using the transposition strand of the double Roebel transposition modes of four traditional rows
Replaced between the row of side two, the position in space, the row of the left side two and the row of the right two where single strand is not uniformly distributed in bar
There is certain difference in the electric current of strand, strand CURRENT DISTRIBUTION is unbalanced on the whole, cause circulation loss larger, and motor uses the longevity
Life is shorter.
The content of the invention
It is local it is an object of the present invention to provide a kind of large ac machines for above-mentioned deficiency of the prior art
Transposition stator bar is mixed with overall, solving circulation loss in existing stator bar causes greatly generator operation security low
Problem.
It is a further object to provide a kind of large ac machines stator bar part transposition side is mixed with overall
Method, this method enable single transposition strand to be evenly distributed in locus where stator bar, are realizing that design changes
While parallactic angle degree and reduction circulation loss, moreover it is possible to largely increase pitch of transposition, be easy to Product processing.
In order to reach foregoing invention purpose, the technical solution adopted by the present invention is：
A kind of large ac machines are local to mix the stator bar that replaces with overall, including it is transversely arranged be four row transposition stock
Line, in the end of stator winding, the transposition strand for forming stator coil is connected by one and headgear；
The four column transpositions strand is divided into four transposition strand unit groups comprising two column transposition strands, described each
The overall transposition for the strand unit group that replaces is provided with the unit group insulating barrier for being used for reinforced insulation protection.
The outer surface of the transposition strand is coated with insulated paint.
The transposition of the transposition strand is provided with the double glass fiber insulating barrier for reinforced insulation protection.
Above-mentioned large ac machines stator bar is local to mix interchanging method with overall, including：
A. in the initial period of stator strand transposition, the transposition stock in the groove portion of stator winding, the strand unit group that replaces
Line carries out itself local transposition first, until the transposition angle of every transposition strand reaches the 1/2 of design transposition angle；And it is located at
Two column transposition strands in transposition strand unit group on the left of stator bar and the transposition strand unit on the right side of stator bar
Two column transposition strands in group are each replaced and are mutually in specular respectively.
B, itself local transposition of transposition strand in transposition strand unit group is stopped, transposition strand is carried out using group as unit
Overall transposition between the strand unit group that replaces, until to be shifted to relative stator bar whole for transposition strand in transposition strand unit group
The diagonal position of body transposition front space；
C, after the overall transposition between completing transposition strand unit group, the entirety stopped between transposition strand unit group is changed
Position, each transposition strand to replace in strand unit group continue still according to the transposition torsional direction of single transposition strand in step A
Itself local transposition is carried out, until completing the design transposition angle of stator bar so that single transposition strand can equably divide
Cloth is in the locus where stator bar, to reduce circulation loss.
Local itself the transposition angle and transposition form all same of single transposition strand in the step A and C.
Two column transposition strands in the transposition strand unit group on the left of the stator bar and right positioned at stator bar
The detailed process that two column transposition strands in the transposition strand unit group of side are replaced respectively is：
The detailed process that two column transposition strands in transposition strand unit group on the left of stator bar are replaced is：
D, the left column transposition strand in the groove portion of stator winding, the strand unit group that replaces moves to the direction away from notch
The distance of 1 transposition strand height is moved in the distance of 1 transposition strand height, the direction of right column transposition strand to close notch；
E, the transposition strand in left column transposition strand farthest away from notch direction is moved in right column transposition strand farthest away from groove
The position in mouthful direction, the transposition strand in right column transposition strand near notch direction be moved in left column transposition strand near
The position of notch；
F, the left column transposition strand in each transposition unit group moves 1 strand height that replaces to the direction away from notch
Distance, right column transposition strand realize transposition strand once to the distance that 1 transposition strand height is moved close to the direction of notch
Transposition；
G, the transposition strand in the unit group that replaces continues to carry out local itself change according to step D to F transposition order successively
Position, until the transposition angle of every transposition strand reaches the 1/2 of design transposition angle.
The transposition form of two column transposition strands in transposition strand unit group on the right side of stator bar is with being located at stator
The transposition form of two column transposition strands in transposition strand unit group on the left of bar is in specular.
The detailed process that is integrally replaced is between the transposition strand unit group：
H, upper left transposition strand unit group and upper right transposition strand unit group move right 1 stock that replaces along groove width direction
The distance of line width, lower-left transposition strand unit group and bottom right transposition strand unit group are moved to the left 1 along groove width direction and changed
The distance of position strand width, prepared for the overall transposition of transposition strand unit group；
I, transposition strand unit group in upper left continues to move right 2 along groove width direction the distance of strand width of replacing, bottom right
Transposition strand unit group continues to be moved to the left the distance of 2 transposition strand width along groove width direction, upper right transposition strand unit group
To the distance that 1 transposition strand unit group height is moved close to notch direction, strand unit group is replaced to away from notch side in lower-left
To the distance of mobile 1 transposition strand unit group height；
J, upper left transposition strand unit group and upper right the strand unit group that replaces move right 1 strand that replaces along groove width direction
The distance of width, lower-left transposition strand unit group and bottom right transposition strand unit group are moved to the left 1 transposition stock along groove width direction
The distance of line width, realize the once overall transposition of transposition strand unit group；
K, the strand unit group that replaces continues overall transposition according to step H to J transposition order successively, until each transposition
Transposition strand is shifted to relative stator bar and integrally replaced the diagonal position of front space in strand unit group.
Transposition strand in stator bar in the present invention can not only realize itself local transposition, and with adjacent transposition stock
Line is combined into a unit group together, the overall transposition between unit group is carried out with other unit group braided wires so that in stator bar
Every transposition strand is distributed between four row's strands, the position in space where equably occupying stator bar；Realizing that design changes
While parallactic angle degree and reduction circulation loss, moreover it is possible to largely increase pitch of transposition, be easy to Product processing.
Beneficial effects of the present invention are：
1）The stator bar mixing interchanging method of the present invention can make transposition strand be replaced between four rows replace strand, change
Position method is more flexible；The interchanging method enable every transposition strand occupy single stator bar where space top and
Bottom, the left part and right part in space where also occupying single stator bar, single transposition strand can be evenly distributed in groove
The diverse location of interior stray field, strand CURRENT DISTRIBUTION is more balanced, and circulation loss further reduces.
2）Transposition strand carries out local and overall mixing and replaced in the stator bar of the present invention, compared to traditional interchanging method,
Single strand transposition identical angle, pitch of transposition increase by 2 times, and mechanical stress diminishes, and facilitates Product processing.
Brief description of the drawings
Fig. 1 is the local structure with overall one embodiment for mixing transposition stator bar of the large ac machines of the present invention
Schematic diagram.
Fig. 2 is the stereogram of one embodiment of itself local transposition of transposition strand in present invention transposition strand unit group.
Fig. 3 is Fig. 2 top view.
Fig. 4 is sectional view of the strand at bit positions A-A that replaced in Fig. 2 and Fig. 3.
Fig. 5 is sectional view of the strand at bit positions B-B that replaced in Fig. 2 and Fig. 3.
Fig. 6 is sectional view of the strand at bit positions C-C that replaced in Fig. 2 and Fig. 3.
Fig. 7 is sectional view of the strand at bit positions D-D that replaced in Fig. 2 and Fig. 3.
Fig. 8 is sectional view of the strand at bit positions E-E that replaced in Fig. 2 and Fig. 3.
Fig. 9 is the vertical of one embodiment that part itself replaces in each transposition strand unit group in the stator bar of the present invention
Body figure.
Figure 10 is the solid of the one embodiment integrally to be replaced between transposition strand unit group in the stator bar of the present invention
Figure.
Figure 11 is Figure 10 top view.
Figure 12 is sectional view of the strand unit group at bit positions M-M that replaced in Figure 10 and Figure 11.
Figure 13 is sectional view of the strand unit group at bit positions N-N that replaced in Figure 10 and Figure 11.
Figure 14 is sectional view of the strand unit group at bit positions P-P that replaced in Figure 10 and Figure 11.
Figure 15 is sectional view of the strand unit group at bit positions Q-Q that replaced in Figure 10 and Figure 11.
Figure 16 is that each transposition strand unit group is shifted to the sectional view at diagonal position R-R before overall transposition.
Embodiment
The embodiment of the present invention is described below, in order to which those skilled in the art understand this hair
It is bright, it should be apparent that the invention is not restricted to the scope of embodiment, for those skilled in the art,
As long as various change in the spirit and scope of the present invention that appended claim limits and determines, these changes are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the row of protection.
According to one embodiment of the application, referring to Fig. 1, Fig. 1 shows that large ac machines are local and changed with overall mix
The structural representation of position stator bar；The stator bar include it is transversely arranged be four row transposition strand, each column strand include 12
Root transposition strand；The four column transpositions strand is divided into four transposition strand unit groups 2, and each strand unit group 2 that replaces includes
Transversely arranged is the transposition strand of two row, and six roots of sensation transposition strand is included per column transposition strand；Each transposition strand unit group appearance
The overall transposition in face is equipped with unit group insulating barrier 1, to strengthen the insulation protection between each transposition strand unit group；Every
The outer surface of transposition strand can coated insulation paint；The transposition of every transposition strand, which can be provided with, is used for reinforced insulation protection
Double glass fiber insulating barrier.
According to one embodiment of the application, referring to Fig. 2 to Fig. 8, Fig. 2 is transposition stock in present invention transposition strand unit group
The stereogram of itself local transposition of line；Fig. 3 to Fig. 7 is that strand is replaced in present invention transposition strand unit group in progress part itself
Sectional view during transposition at different bit positions；As shown in Fig. 2 12 transposition strands are included in transposition strand unit group,
Transversely arranged is 2 row, and each column includes 6 transposition strands, and the detailed process of itself local transposition is carried out in transposition strand unit group
It is as follows：
As can be seen that A-A positions are the original positions that strand replaces that replaced in transposition strand unit group from Fig. 2 and Fig. 3,
Its sectional view is as shown in Figure 4；Left column transposition strand starts before column transposition strand transposition to the right and right column transposition strand start to
Before left column transposition strand transposition, left column transposition strand moves the distance of 1 transposition strand height, right row to the direction away from notch
Strand replace to the distance that 1 transposition strand height is moved close to the direction of notch, until B-B positions, standard is done for strand across row
Standby, its sectional view is as shown in Figure 5；Replaced between being arranged again along groove width direction transposition strand f and l, in left column transposition strand most
Transposition strand away from notch direction is moved in right column transposition strand farthest away from the position in notch direction, in right column transposition strand
Transposition strand near notch direction is moved in left column transposition strand near the position of notch, when transposition strand f and l are complete
After being replaced entirely between the row of completion, in-position D-D, its sectional view is as shown in Figure 7；Wherein, C-C is the interposition in being replaced between arranging
Put, its sectional view is as shown in Figure 6；To ensure that the transposition strand in transposition strand unit group axially maintains during transposition
Identical locus, left column transposition strand move the distance of 1 transposition strand height, right column transposition to the direction away from notch
Strand is to the distance that 1 transposition strand height is moved close to the direction of notch, and now, all transposition strands are completed after once replacing
Relevant position E-E is reached, its sectional view is as shown in Figure 8；Transposition strand in the unit group that replaces continues successively according to Fig. 4 to Fig. 8
Transposition order carry out itself local transposition, until the transposition angle of every transposition strand reaches design and replaces the 1/2 of angle.
Transposition strand is during itself local transposition is carried out in each transposition strand unit group, the row's strand of the left side two and the right side
The row's strand of side two each self-transposition and is mutually mirror respectively, and its stereogram is as shown in Figure 9.
When the strand that replaces needs to carry out the transposition between four rows, stop itself local transposition of transposition strand, replaced
Overall transposition between strand unit group；According to one embodiment of the application, referring to Figure 10 and Figure 11, Figure 10 is of the invention
The stereogram integrally to be replaced between transposition strand unit group in stator bar；Figure 11 is Figure 10 top view；Stator bar includes
Upper left, lower-left, upper right and the transposition strand unit group of bottom right four, each strand unit group that replaces is interior to include 12 transposition strands,
Transversely arranged is 2 row, and each column includes 6 transposition strands, and the detailed process integrally to be replaced between the strand unit group that replaces is such as
Under：
As can be seen that M-M positions are the start bits that each transposition strand unit group is integrally replaced from Figure 10 and Figure 11
Put, its sectional view is as shown in figure 12；Left column transposition strand unit group starts to turn right before the transposition of column transposition strand unit group and right
Before column transposition strand unit group starts column transposition strand unit group transposition to the left, upper left transposition strand unit group and upper right transposition stock
Line unit group moves right 1 the distance of strand width of replacing, lower-left transposition strand unit group and bottom right along groove width direction respectively
Transposition strand unit group is moved to the left the distance of 1 transposition strand width along groove width direction respectively, until N-N positions, for transposition
The overall transposition of strand unit group is prepared, and its sectional view is as shown in figure 13；Upper left transposition strand unit group continues along groove width side
To the distance of strand width of replacing that moves right 2, bottom right transposition strand unit group, which continues to be moved to the left 2 along groove width direction, changes
The distance of position strand width, upper right transposition unit group move the distance of 1 transposition strand unit group height to close notch direction,
Lower-left transposition unit group moves the distance of 1 transposition strand unit group height, in-position P-P, its section to remote notch direction
Face figure is as shown in figure 14；To ensure that transposition strand unit group axially maintains identical locus during integrally replacing,
Replace strand unit group and upper right transposition strand unit group of upper left moves right 1 the strand width that replaces along groove width direction respectively
Distance, lower-left transposition strand unit group and bottom right transposition strand unit group are moved to the left 1 transposition strand along groove width direction respectively
The distance of width, all transposition strand unit groups complete once overall transposition, reach relevant position Q-Q, its sectional view such as Figure 15
It is shown；Each transposition strand unit group carries out overall transposition once again according to Figure 12 to Figure 15 transposition order successively so that respectively changes
Transposition strand is shifted to relative stator bar and integrally replaced the diagonal position of front space in the strand unit group of position, its section such as Figure 16
It is shown.
After integrally being replaced between completing transposition strand unit group, stop overall transposition, the stock respectively to replace in strand unit group
Line continues to carry out itself local transposition, the transposition angle until completing stator bar design with original transposition torsional direction.
Strand requirement can not only be realized by mixing interchanging method with entirety using stator bar provided by the present invention part
Replaced angle, and single transposition strand is distributed between the four rows transposition strand of stator bar, equably occupies stator bar
The diverse location in place space, strand CURRENT DISTRIBUTION is more balanced, and circulation loss further reduces；Simultaneously as transposition strand
Four transposition strand unit groups are divided into, pitch of transposition increases by 2 times, is easy to Product processing.
Claims (7)
1. a kind of large ac machines stator bar is local to mix interchanging method with overall, the stator bar includes transversely arranged
For the transposition strands of four row, in the end of stator winding, for forming the transposition strand of stator coil by one and headgear
Connection；
The four column transpositions strand is divided into four transposition strand unit groups comprising two column transposition strands, each transposition
The overall transposition of strand unit group is provided with the unit group insulating barrier for being used for reinforced insulation protection；It is characterized in that the part with
Overall mixing interchanging method includes：
A. the transposition strand in the groove portion of stator winding, the transposition strand unit group carries out itself local transposition first, directly
Transposition angle to every transposition strand reaches the 1/2 of design transposition angle；
B. stop itself local transposition of transposition strand, overall transposition is carried out between the strand unit group that replaces, until transposition strand
Transposition strand is shifted to relative stator bar and integrally replaced the diagonal position of front space in unit group；
C. the entirety stopped between transposition strand unit group replaces, and the transposition strand in the strand unit group that replaces is according to single in step A
The transposition torsional direction of root transposition strand continues itself local transposition, until the design transposition angle of stator bar is completed,
Single transposition strand is enabled to be evenly distributed in the locus where stator bar, to reduce circulation loss.
2. large ac machines stator bar as claimed in claim 1 is local to mix interchanging method with overall, it is characterized in that, change
When transposition strand in the strand unit group of position carries out itself local transposition, in the transposition strand unit group on the left of stator bar
Two column transposition strands and transposition strand unit group on the right side of stator bar in two column transposition strands replaced respectively
And mutually it is in specular.
3. large ac machines stator bar as claimed in claim 2 is local to mix interchanging method with overall, it is characterized in that, position
The detailed process that two column transposition strands in transposition strand unit group on the left of stator bar are replaced is：
D, the left column transposition strand in the groove portion of stator winding, the strand unit group that replaces moves 1 to the direction away from notch
The distance of 1 transposition strand height is moved in the distance for the strand height that replaces, the direction of right column transposition strand to close notch；
E, the transposition strand in left column transposition strand farthest away from notch direction is moved in right column transposition strand farthest away from notch side
To position, the transposition strand in right column transposition strand near notch direction is moved in left column transposition strand near notch
Position；
F, each transposition unit group in left column replace strand to away from notch direction move 1 transposition strand height away from
From right column transposition strand realizes once changing for transposition strand to the distance that 1 transposition strand height is moved close to the direction of notch
Position；
G, the transposition strand in the unit group that replaces continues to carry out itself local transposition according to step D to F transposition order successively, directly
Transposition angle to every transposition strand reaches the 1/2 of design transposition angle.
4. large ac machines stator bar as claimed in claim 2 is local to mix interchanging method with overall, it is characterized in that, institute
Stating the detailed process integrally to be replaced between transposition strand unit group is：
H, upper left transposition strand unit group and upper right transposition strand unit group are wide along groove width direction 1 strand that replaces that moves right
The distance of degree, lower-left transposition strand unit group and bottom right transposition strand unit group are moved to the left 1 transposition stock along groove width direction
The distance of line width, prepared for the overall transposition of transposition strand unit group；
I, transposition strand unit group in upper left continues to move right 2 along groove width direction the distance of strand width of replacing, bottom right transposition
Strand unit group continue along groove width direction be moved to the left 2 transposition strand width distance, upper right replace strand unit group to by
The distance of 1 transposition strand unit group height is moved in nearly notch direction, and lower-left transposition strand unit group is moved to away from notch direction
The distance of dynamic 1 transposition strand unit group height；
J, upper left transposition strand unit group and upper right the strand unit group that replaces move right 1 the strand width that replaces along groove width direction
Distance, lower-left transposition strand unit group and bottom right replace strand unit group along groove width direction be moved to the left 1 transposition strand it is wide
The distance of degree, realize the once overall transposition of transposition strand unit group；
K, the strand unit group that replaces continues overall transposition according to step H to J transposition order successively, until each transposition strand
Transposition strand is shifted to relative stator bar and integrally replaced the diagonal position of front space in unit group.
5. large ac machines stator bar as claimed in claim 1 or 2 is local to mix interchanging method with overall, its feature
It is local itself the transposition angle and transposition form all same of the single transposition strand in the step A and C.
6. large ac machines stator bar as claimed in claim 1 is local to mix interchanging method with overall, it is characterized in that, institute
The outer surface for stating transposition strand is coated with insulated paint.
7. large ac machines stator bar as claimed in claim 1 is local to mix interchanging method with overall, it is characterized in that, institute
The transposition for stating transposition strand is provided with the double glass fiber insulating barrier protected for reinforced insulation.
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| CN201510584258.5A CN105048679B (en) | 2015-09-15 | 2015-09-15 | A kind of large ac machines are local to mix transposition stator bar and mixing interchanging method with overall |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017099118A (en) * | 2015-11-24 | 2017-06-01 | 株式会社東芝 | Armature coil for rotary electric machine |
| CN107634600B (en) * | 2017-10-20 | 2023-06-06 | 哈尔滨理工大学 | Gradually-changed type air-to-position conversion stator bar of large alternating current motor and gradually-changed type air-to-position conversion method |
| CN108711987B (en) * | 2018-08-24 | 2023-12-22 | 哈尔滨理工大学 | Global transposition ring type coil of alternating current motor stator and design method thereof |
| CN113783335B (en) * | 2021-09-13 | 2022-07-29 | 哈尔滨理工大学 | Method for grouping transposition of stator winding of steam turbine generator in different sides and connecting end parts of stator winding in different sides |
| CN113783336B (en) * | 2021-09-13 | 2022-05-13 | 哈尔滨理工大学 | Stator bar with four rows of strand wires integrally transposed and four rows of strand wires integrally transposed method for steam turbine generator |
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