CN109474103B - Cross-over voltage reduction double-branch stator winding structure - Google Patents
Cross-over voltage reduction double-branch stator winding structure Download PDFInfo
- Publication number
- CN109474103B CN109474103B CN201811470942.0A CN201811470942A CN109474103B CN 109474103 B CN109474103 B CN 109474103B CN 201811470942 A CN201811470942 A CN 201811470942A CN 109474103 B CN109474103 B CN 109474103B
- Authority
- CN
- China
- Prior art keywords
- winding
- potential
- branch
- stator
- low
- 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.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
- Synchronous Machinery (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The invention provides a cross-over voltage reduction double-branch stator winding structure, which is characterized in that each branch of two same branches connected in parallel with each phase of stator winding of a generator is divided into a high-potential branch winding and a low-potential branch winding, so that each branch is formed by connecting the high-potential branch winding and the low-potential branch winding in series, the low potential end of the high-potential branch winding in each branch is connected with a neutral point, the high potential end of the high-potential branch winding is connected with the low potential end of the low-potential branch winding, and the high potential end of the low-potential branch winding is connected with each phase of output.
Description
The technical field is as follows:
the invention relates to a cross-over voltage reduction double-branch stator winding structure.
Background art:
the insulation technology and the ventilation cooling technology are bottleneck problems which restrict the large-capacity design of the turbonator and are also key problems which influence the service life of the turbonator; the stator winding is the most important part in the turbonator, is also the part with the largest heating loss, is an electromechanical energy conversion center, and has electromagnetic interlinkage and armature current passing; the working performance of the system not only influences the output and efficiency of the unit, but also is directly related to the reliability of the unit operation; along with the increase of the capacity of the turbo generator unit, the voltage and the current of the stator winding need to be increased along with the increase of the capacity of the turbo generator unit so as to meet the requirement of larger electric energy output, and the contradiction that the insulation anti-corona, the ventilation and the heat dissipation and the mechanical structure problem are mutually restricted is more prominent; the stator winding of the air-cooled steam turbine generator adopts a surface cooling mode, the surface area of the stator winding determines the allowable power consumption and becomes the limiting condition for increasing the capacity of the generator, and a double-branch double-layer three-phase stator winding appears for increasing the surface area of the stator winding, so that the surface area of the stator winding can be increased on the premise of keeping the reasonable electromagnetic structure; each phase winding of the stator winding consists of a stator coil, a head joint sleeve or a butt joint and an arc lead, each phase winding is a double-layer winding with two branches, each branch is connected by the stator coil through the arc lead, each stator coil is formed by connecting two strip-type molding wire bars through the head joint sleeve or the butt joint, and the two branch windings are embedded into stator iron core slots; its advantages are less branch current, low loss in slot, less electromagnetic force of winding, high fixing power of winding, and high efficiency and reliability of motor
As a key problem of insulation technology, corona problem is one of the key problems of stator winding insulation technology, especially in air-cooled generators, which is a fatal factor affecting the life of the generator, and it is apparent that corona may occur between two adjacent stator bars in different phase belts due to the limitation of a specific bar structure, that is, the rated voltage of the generator, and the potential difference between other adjacent bars is only a fraction to a fraction of the rated voltage, and such two adjacent stator bars in different phase belts may have six places; the synchronous turbonator adopts a Y connection method, so that two adjacent stator bars in different phase zones only have three positions, namely three corona sensitive zones, which are distributed at the end part of a stator winding at intervals of 120 degrees;
the wiring structure of the stator winding of the large-scale steam turbine generator is composed of parallel-connected rings and a lead structure, the structural design of the wiring structure is limited by a space structure, a manufacturing and mounting process and other limiting conditions, the minimization of the magnetic flux synthesized by the parallel-connected rings, the requirement of the structural electrical spacing and the limitation of the structural electromagnetic spacing are also considered, the hidden danger of damaging the generator operation such as discharging, heating and the like is avoided, the problems of structural electromagnetic force, structural vibration correspondence, structural stress and the like, the ventilation cooling problem, the branch symmetry and the circulation problem and the like are also considered; different from the diversity of winding forms of small and medium-sized wound generators, the winding form of the small and medium-sized wound generators can only be limited to a single-layer or double-layer overlapping winding connection method, and the number of rows connected in parallel is also limited by the structure and the process, so that the traditional connection method of the stator winding of the steam turbine generator has the problem that the voltage between end winding phases is close to or equal to the rated voltage;
the variable-pitch coil bar structure is arranged on the water internal cooling generator, gaps among the coil bars positioned at the positions of three corona sensitive bands are artificially increased, and the purpose of increasing the corona voltage is achieved, but the manufacturing cost of the stator coil bar is greatly increased, and the adoption of the method cannot be accepted or realized in terms of cost and structure due to the fact that the number of the stator coil bars of the air cooling generator is large;
the invention content is as follows: the invention discloses a cross-over voltage reduction double-branch stator winding structure, which reduces the voltage between two adjacent stator bars in different phase bands to one half of that of the traditional connection method, greatly reduces the voltage between the two adjacent stator bars, improves the corona starting voltage of a generator to two times of that of the traditional structure, and improves the corona resistance of the generator. The technical scheme of the invention is as follows: a cross-over voltage reduction double-branch stator winding structure divides each branch of two same branches of each phase of stator winding of a generator in parallel into a high-potential branch winding (1) and a low-potential branch winding (2), so that each branch is formed by connecting the high-potential branch winding (1) and the low-potential branch winding (2) in series, a low-potential end (3) of the high-potential branch winding in each branch is electrically connected with a neutral point (4), a high-potential end (5) of the high-potential branch winding is electrically connected with a low-potential end (6) of the low-potential branch winding, and a high-potential end (7) of the low-potential branch winding is electrically connected with each phase of output (8).
The working principle of the invention is as follows:
the high-potential sub-winding of each phase of stator winding is hidden in the middle of each phase of stator winding by changing the electrical connection sequence of the original stator bar, and the low-potential sub-winding is arranged at the junction of phase belts, so that the voltage between two adjacent stator bars is reduced.
The invention has the technical effects that:
the high-potential sub-winding of each phase of stator winding is adjacent to the low-potential sub-winding of the adjacent phase of stator winding in the traditional connection method, so that the voltage between two adjacent stator bars in different phase bands is rated voltage, and the position is the corona sensitive band. The traditional connection method for improving the corona resistance needs to improve the grade of an insulation system or change the gap between the wire bars of the stator wire bar structure at the position of the corona sensitive belt, and the method is unacceptable or unrealizable in cost and structure due to the large number of the stator wire bars of the air-cooled generator.
The invention keeps the original structure of the stator bar of the generator, the original insulation system of the generator and the original structure of the connecting device, changes the connection sequence of the stator bar by increasing the number of the connecting device, namely, the invention adopts the wiring method that each phase of stator winding is composed of two parallel branches formed by connecting a high potential branch winding and a low potential branch winding in series, the low potential end of the high potential branch winding is electrically connected with a neutral point, the high potential end of the high potential branch winding is electrically connected with the low potential end of the low potential branch winding, and the high potential end of the low potential branch winding is electrically connected with the output of each phase, so that the voltage between two adjacent stator bars in different phase zones is reduced to be less than one half of the voltage of the traditional connection method, the corona starting voltage of the generator is greatly improved compared with the prior structure, and the corona resistance performance.
Description of the drawings:
FIG. 1 is a wiring diagram of the present invention.
Fig. 2 is a U-phase wiring diagram of a conventional 66-slot stator.
Fig. 3 is a V-phase connection diagram of a conventional 66-slot stator.
Fig. 4 is a W-phase wiring diagram of a 66-slot stator in a conventional structure.
Fig. 5 is a U-phase wiring diagram of a 66-slot stator embodiment of the present invention.
Fig. 6 is a V-phase wiring diagram of the present invention particularly applied to a 66-slot stator solution.
Fig. 7 is a W-phase wiring diagram of the invention particularly applied to the 66-slot stator solution.
The specific implementation mode is as follows:
a cross-over voltage reduction double-branch stator winding structure is characterized in that: each branch of two identical branches of each phase of stator winding of the generator connected in parallel is divided into a high-potential branch winding 1 and a low-potential branch winding 2, so that each branch is formed by connecting the high-potential branch winding 1 and the low-potential branch winding 2 in series, a low-potential end 3 of the high-potential branch winding in each branch is electrically connected with a neutral point 4, a high-potential end 5 of the high-potential branch winding is electrically connected with a low-potential end 6 of the low-potential branch winding, and a high-potential end 7 of the low-potential branch winding is electrically connected with an output 8 of each phase.
As shown in fig. 1, each branch of two identical branches of each phase of the generator, in which stator windings of each phase are connected in parallel, is split into a high-potential sub-winding 1 and a low-potential sub-winding 2, so that each branch is formed by connecting the high-potential sub-winding 1 and the low-potential sub-winding 2 in series, a low-potential end 3 of the high-potential sub-winding is connected with a neutral point 4, a high-potential end 5 of the high-potential sub-winding in each branch is connected with a low-potential end 6 of the low-potential sub-winding, and a high-potential end 7 of the low-potential sub-; because each branch of two same branches connected in parallel with each phase of stator winding is split into a high-potential branch winding and a low-potential branch winding, each branch is formed by connecting the high-potential branch winding and the low-potential branch winding in series, the low potential end of the high-potential branch winding in each branch is connected with each phase of output, the high potential end of the high-potential branch winding is connected with the low potential end of the low-potential branch winding, and the high potential end of the low-potential branch winding is connected with a neutral point, the voltage between two adjacent stator bars in different phase bands is reduced to be less than one half of that of a traditional connection method, the corona starting voltage of the generator is greatly improved compared with that of the traditional structure, and the corona resistance performance of the generator is improved;
the technical scheme of the 66-slot stator is taken as an example for explanation, the pitch of the excitation end of a stator bar is thirteen slot pitches, the pitch of the steam end of the stator bar is thirteen points and five slot pitches, the total pitch difference of two ends of the steam excitation is one slot pitch, for simplicity of description, the upper layer of the stator bar is represented as T and is named clockwise, the first stator bar is named as T1, the second stator bar is named as T2, …, the Nth stator bar is named as TN and …, the lower layer of the corresponding stator bar is represented as B and is named clockwise, the first stator bar is named as B1, the second stator bar is named as B2 and …, and the Nth stator bar is named as BN and …;
the traditional connection method comprises the following steps:
t23 and B27 are connected with the U1 phase output as shown in FIG. 2; b60 and T56 are connected with a neutral point U2;
t1 and B5 are connected with V1 phase output as shown in FIG. 3; b38 and T34 are connected with a neutral point V2;
t45 and B49 are connected with the W1 phase output as shown in FIG. 4; b16 and T12 are connected with a neutral point W2;
u1, V1 and W1 are output of each phase, the interphase voltage is rated voltage, T1 and T66, T22 and T23 and T44 and T45 are adjacent bars respectively, as can be seen from figures 2, 3 and 4, T1 and T66, T22 and T23 and T44 and T45 are in different phases respectively, the voltage between the T22 and T23 is close to the interphase voltage, namely the rated voltage, and three corona sensitive bands are formed;
the invention is particularly applied to a technical scheme wiring diagram of a sixteenmo slot stator, and according to the technical scheme of the invention:
as shown in fig. 5, four joints, respectively B55, T29, T61 and B21, are added at the field end of the stator; connecting T29 and B21 to U1 phase output; b60 is connected with T23, T65 is connected with B27; b55 and T61 are connected with a neutral point U2;
as shown in fig. 6, four joints, respectively B33, T7, T39 and B65, are added at the field end of the stator; t7 and B65 are connected with V1 phase output; b38 is connected with T1, B5 is connected with T34; b33 and T39 are connected with a neutral point V2;
as shown in fig. 7, four joints, namely B11, T51, T17 and B43 are added at the excitation end of the stator; b43 and T51 are connected with W1 phase output; t12 to B49, B12 to T45; t17 and B11 are connected with a neutral point W2;
u1, V1 and W1 are output of each phase, the inter-phase voltage is rated voltage, T1 and T66, T22 and T23 and T44 and T45 are respectively adjacent bars, three corona sensitive bands are adopted in the conventional structural connection method, but in the connection method of the invention, T1 and T66, T22 and T23, T44 and T45 have voltage which is only close to half of the voltage of the original phase, namely the voltage of the three corona sensitive bands is reduced to be less than half of that of the conventional connection method, the starting voltage of the generator is greatly improved compared with the conventional structure, and the corona resistance performance of the generator is improved.
Claims (1)
1. A cross-over voltage reduction double-branch stator winding structure is characterized in that: each branch of two identical branches of each phase of stator winding of the generator connected in parallel is divided into a high-potential branch winding (1) and a low-potential branch winding (2), each branch is formed by connecting the high-potential branch winding (1) and the low-potential branch winding (2) in series, a low-potential end (3) of the high-potential branch winding in each branch is electrically connected with a neutral point (4), a high-potential end (5) of the high-potential branch winding is electrically connected with a low-potential end (6) of the low-potential branch winding, and a high-potential end (7) of the low-potential branch winding is electrically connected with each phase of output (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470942.0A CN109474103B (en) | 2018-12-04 | 2018-12-04 | Cross-over voltage reduction double-branch stator winding structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470942.0A CN109474103B (en) | 2018-12-04 | 2018-12-04 | Cross-over voltage reduction double-branch stator winding structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109474103A CN109474103A (en) | 2019-03-15 |
| CN109474103B true CN109474103B (en) | 2020-08-07 |
Family
ID=65675551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811470942.0A Active CN109474103B (en) | 2018-12-04 | 2018-12-04 | Cross-over voltage reduction double-branch stator winding structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109474103B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4450125B2 (en) * | 1999-12-09 | 2010-04-14 | 株式会社デンソー | Rotating electric machine for vehicles |
| JP4042676B2 (en) * | 2003-10-20 | 2008-02-06 | 株式会社デンソー | Armature for rotating electrical machine |
| CN201303262Y (en) * | 2008-10-14 | 2009-09-02 | 林仕供 | Main device of double-voltage and single-phase motor |
| JP5231950B2 (en) * | 2008-11-13 | 2013-07-10 | 株式会社東芝 | Armature winding of rotating electric machine |
| CN201854113U (en) * | 2010-11-25 | 2011-06-01 | 廊坊科森电器有限公司 | Coil and motor provided with same |
| CN103219935A (en) * | 2012-08-16 | 2013-07-24 | 襄阳航力机电技术发展有限公司 | Dual-output generator voltage accurate adjusting device |
| CN204761241U (en) * | 2015-07-01 | 2015-11-11 | 袁正彪 | Motor with multistage stepped winding |
-
2018
- 2018-12-04 CN CN201811470942.0A patent/CN109474103B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109474103A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9379586B2 (en) | Bar wound stator winding layout with long-pitched and short-pitched coils | |
| KR100382963B1 (en) | Rotary Electric Machine Plant | |
| EP4175125A1 (en) | Stator, flat wire motor, powertrain, and vehicle | |
| KR100488408B1 (en) | Vehicle ac generator having vibration-resistant stator | |
| US10367388B2 (en) | Main motor for railway vehicle | |
| US10819177B2 (en) | Helical winding with more uniform field utilization | |
| WO2018209778A1 (en) | Motor stator assembly, motor, and electric vehicle having motor | |
| CN210041484U (en) | Two branch phase windings, stator and motor | |
| CN101515741B (en) | Method for winding rotor coil of motor | |
| CN108713288A (en) | Multistage high speed variable speed drivP | |
| CN109617283B (en) | Cross-over voltage reduction three-branch stator winding structure | |
| CN104795917B (en) | A kind of polyphase machine winding mechanism | |
| CN109301950A (en) | A kind of stator winding and disc type electric machine | |
| CN109474103B (en) | Cross-over voltage reduction double-branch stator winding structure | |
| CN110867994B (en) | Rotating electrical machine | |
| CN111200328A (en) | Four-way parallel flat wire motor winding structure | |
| Lin et al. | Concentric-coil distributed winding design for large direct-drive fully superconducting machines | |
| CN211239494U (en) | Motor winding and motor stator | |
| CN108199551B (en) | Non-overlapping winding tooth slot type double-rotor electric excitation synchronous motor | |
| Canders et al. | Multiphase machines with individual slot activation | |
| US9231447B2 (en) | Stator winding of an electric generator | |
| US20230268789A1 (en) | Flat wire stator and motor | |
| CN110768410A (en) | Flat wire stator of permanent magnet synchronous motor for vehicle | |
| CN114069914B (en) | Flat wire motor stator winding | |
| CN218997803U (en) | Stator winding structure of generator, generator stator and generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |