CN1004461B - New exchange position connection of stator coil rod of large a.c. generator - Google Patents
New exchange position connection of stator coil rod of large a.c. generator Download PDFInfo
- Publication number
- CN1004461B CN1004461B CN86103857.6A CN86103857A CN1004461B CN 1004461 B CN1004461 B CN 1004461B CN 86103857 A CN86103857 A CN 86103857A CN 1004461 B CN1004461 B CN 1004461B
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- CN
- China
- Prior art keywords
- line rod
- unit lead
- transposition
- group
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Windings For Motors And Generators (AREA)
Abstract
The present invention relates to the new transposition connection of a stator bar of a large-sized alternating current generator, which belongs to the technical field of a rotating generator. For bars with the transposition mode of 0 DEG /360 DEG /0 DEG, the present invention is characterized in that the circulating loss caused by a transverse inductance leakage magnetic field at the end of a coil is reduced to less than 30% of the original loss, and the circulating loss caused by a transverse mutual inductance leakage magnetic field at the end is about 1/16 of the original loss. For bars with the transposition mode of 0 DEG /540 DEG /0 DEG, the circulating additional loss can be reduced to less than 30% of the original loss. Compared with the prior art, the present invention has the advantages of simple manufacturing process, convenient generalization, etc., and is especially suitable for reforming old generator units.
Description
The invention belongs to the electric rotating machine field, particularly relate to the transposed connecting method of large ac machines stator bar.
Stator bar in large ac machines, caused circulation loss is quite surprising (to comprise radially stray field and horizontal self-induction stray field and laterally mutual inductance stray field) in the end at its two ends because stray field, in order to reduce the temperature difference between circulation loss and unit lead, in order to improve operational reliability and efficient, the motor manufacturing has been carried out deep research to this, made extensive work from theory into action.According to theory analysis, the desirable transposition form of whole line rod is 180 °/540 °/-180 °, but adopts this both ends to reverse 180 °, and the transposition that its torsional direction is opposite, technologic difficulty is very big, and the wire insulation at both ends is easy to damage, so still there is not the report of practical application at present.A kind of " new construction of large ac machines stator bar " that Chinese patent 85200122.3 is proposed solved the problem that the line stick end does not replace substantially, but the way of each line rod by described Chinese patent 85200122.3 must be connected, it is close with the obtained effect of the line rod of desirable transposition form (180 °/540 °/-180 °) that the caused loss of circulating current in the unit lead is greatly reduced.When making like this, as long as the line rod makes a kind of shape, but when connecting, each coil will have a joint.
The connection scheme of pointing out in " improvement of motor windings " specification that British patent approval number 964286 is proposed only can reduce the circulation loss that end cross mutual inductance leakage field place produces.As being that the end unit lead does not replace to 0/360 °/0(, only slot part unit lead is done 360 ° reversing) the line rod of full transposition form, only can reduce the circulation that end cross mutual inductance stray field produces, and can not reduce the circulation that end radial magnetic field and end cross self-induction stray field produce, to 0 °/540 °/0 ° (be that the end unit lead does not replace, only lead work in slot part unit reverses for the 540 °) effect of the line rod unrestraint circulation of transposition form entirely.The connection scheme that it proposed simultaneously must be connected into a-a ', b-b ', c-c ', d-d ' and a-d ', b-c ', c-b ', d-a ' dual mode with the unit lead group a ' of lower floor, b ', c ', the d ' in upper unit lead group a, b, c, d and another groove in the groove.Like this, the technology of unit lead group connection is very complicated.
Task of the present invention is to adopt the new transposition of stator bar to connect, so that make the CURRENT DISTRIBUTION trend in the large ac machines stator bar unit lead even, reduces circulation loss, raises the efficiency, and line rod transposition connecting process is simple, is easy to promote and use.
The new transposition of large ac machines stator bar connects for convenience of explanation, now sets forth one by one by accompanying drawing.
Accompanying drawing 1 is that the R formula of conventional line stick end connects schematic diagram.
Accompanying drawing 2 is that extraordinary line rod one end nose transposition T formula connects schematic diagram.
Accompanying drawing 3 is a branch road or the coil connection schematic diagram that the utmost point is organized mutually.
S is the line rod of part in stator coring groove in the accompanying drawing, and E is the end of line rod outside groove, and N is line rod nose coupling head signal, I is the load current in the line rod, and its arrow is the flow direction of assumed load electric current, a, b, c, d, a ', b ', c ' and d ' are the unit lead group of line rod, and U is the line rod is in the upper strata in stator slot position, and L is the line rod is in lower floor in stator slot position.R in the accompanying drawing 3 is the connection of conventional line stick end, connects by the mode shown in the accompanying drawing 1; T is that the transposition of extraordinary line rod one end nose connects, and connects by the mode shown in the accompanying drawing 2.
Line of the present invention rod transposition form is 0/540 °/0 or 0/360 °/0, and promptly do not replace in the end, and only to make the unit lead of 540 ° or 360 ° be short circuit to slot part unit lead.
When the line rod is connected into the excellent T formula transposition of extraordinary line connection, the both sides two unit lead groups of another line rod that must join the centre two unit lead groups (b, c) of two lines rod, one end noses and (b ', c ') with it respectively (a ', d ') and (a, d) link, only in this way, could guarantee by the circulation supplementary load loss that line stick end self-induction stray field causes it is to weaken mutually, and it is even to reach in the unit lead CURRENT DISTRIBUTION, reduce loss, the purpose of raising the efficiency.
The new transposition of line rod of the present invention connection technique is particularly useful for the technological transformation of old unit, can not need change whole old line rods, just can obtain to reduce significantly the effect of circulation loss.
Claims (2)
1, the transposition connecting mode of large ac machines stator bar, what adopt is 0/360 °/0 or 0/540 °/0, be that the end, two ends of the line rod slot part unit lead that only do not replace is made 360 ° or the 540 ° full transposition forms that reverse, two-layer two line rods up and down in different slots, connect the composition coil by line rod termination nose units corresponding lead group, it is characterized in that: in the coil that the line rod of described 0/360 °/0 or 0/540 °/0 full transposition is formed, the unit lead in each line rod is divided into four groups of unit lead group (a, b equably by the short transverse of line rod, c, d) and (a ', b ', c ', d '), the mid point end (T) of whole winding each connection place (R) in addition all will divide into groups to connect during each bar branch road or each utmost point were organized mutually, i.e. unit lead group (a, the b of stator upper strata (U) line rod, c, d) with the unit lead group of lower floor (L) line rod (a ', b ', c ', d ') respectively by group a-d ', group b-c ' knits c-b ', and the mode of group d-a ' connects; Described mid point end (T) will connect by the grouping transposition, two unit lead groups on two unit lead groups in the middle of the line rod of stator upper strata (U) and another line rod limit are coupled to each other, promptly become unit lead group (a, d, b ', c ') and (a ', d ', b c) connects respectively and the T formula of mutually insulated connects.
2, the transposition connecting mode of large ac machines stator bar according to claim 1 is characterized in that: form a branch road or a utmost point and organize mutually, its top and all terminal unit leads are short circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86103857.6A CN1004461B (en) | 1986-05-31 | 1986-05-31 | New exchange position connection of stator coil rod of large a.c. generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86103857.6A CN1004461B (en) | 1986-05-31 | 1986-05-31 | New exchange position connection of stator coil rod of large a.c. generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86103857A CN86103857A (en) | 1987-12-09 |
| CN1004461B true CN1004461B (en) | 1989-06-07 |
Family
ID=4802217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86103857.6A Expired CN1004461B (en) | 1986-05-31 | 1986-05-31 | New exchange position connection of stator coil rod of large a.c. generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004461B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19545307A1 (en) * | 1995-12-05 | 1997-06-12 | Asea Brown Boveri | Fixed stator winding rod with extended field compensation |
| CN104852535B (en) * | 2015-05-22 | 2017-10-13 | 哈尔滨理工大学 | A kind of novel alternating-current generator positioning line rod transposition method |
| CN105099032B (en) * | 2015-09-15 | 2017-06-09 | 哈尔滨理工大学 | A kind of double week mixing transposition stator bars of large turbo-type generator and double week mixing interchanging methods |
| 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 |
-
1986
- 1986-05-31 CN CN86103857.6A patent/CN1004461B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86103857A (en) | 1987-12-09 |
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| C10 | Entry into substantive examination | ||
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| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |