CN113328551A - Winding assembly, generator and wind generating set - Google Patents
Winding assembly, generator and wind generating set Download PDFInfo
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- CN113328551A CN113328551A CN202110521215.8A CN202110521215A CN113328551A CN 113328551 A CN113328551 A CN 113328551A CN 202110521215 A CN202110521215 A CN 202110521215A CN 113328551 A CN113328551 A CN 113328551A
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- 238000004804 winding Methods 0.000 title claims abstract description 87
- 238000009413 insulation Methods 0.000 claims abstract description 60
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000012212 insulator Substances 0.000 claims description 49
- 239000000463 material Substances 0.000 claims description 20
- 239000004020 conductor Substances 0.000 claims description 17
- 230000015556 catabolic process Effects 0.000 claims description 8
- 210000003298 dental enamel Anatomy 0.000 claims description 7
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 16
- 239000010410 layer Substances 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000002459 sustained effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- -1 wire enamel Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical 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
-
- 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
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/30—Windings characterised by the insulating material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The invention relates to a winding assembly, a generator and a wind generating set, wherein the winding assembly comprises: the iron core comprises an iron core body, a plurality of mounting grooves and a plurality of connecting grooves, wherein the iron core body is provided with a central axis and the mounting grooves are distributed around the central axis at intervals; the winding sets up in the iron core body, and the winding includes a plurality of branches, and each branch road includes a plurality of coils respectively, and every coil includes the turn of a line of a plurality of range upon range of settings, and the turn of a line is provided with insulation system, and the insulation system's of two at least coils of same branch road insulating strength is different. According to the winding assembly, the generator and the wind generating set provided by the embodiment of the invention, the winding assembly can ensure the safety performance and is low in cost.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a winding assembly, a generator and a wind generating set.
Background
The generator is controlled by a frequency converter, and high-order pulse voltage of MHz level can be generated by opening and closing an Insulated Gate Bipolar Transistor (IGBT) switch in the frequency converter, so that very large electric stress can be generated, the electric stress can possibly cause local discharge inside an insulation system, the insulation system can be damaged by the local discharge, and the turn line or ground insulation of a coil of a winding assembly can be failed, so that the generator is damaged. In order to reduce or avoid the influence of the higher-order pulse voltage on the corresponding coil, an insulation structure resistant to partial discharge is generally arranged on the winding of each coil.
In a conventional generator, the insulation strength of the insulation structure of each coil of the winding assembly is consistent, and in order to reduce the influence on each coil, the insulation structure of the turn line of each coil is generally arranged by taking the coil which can bear the highest influence of the electrical stress generated by the high-order pulse voltage as a reference, and although the insulation structure can protect each coil, the insulation structure also has corresponding defects. The main manifestation is that the insulation structure that is subjected to high electrical stress is usually expensive, so that the overall cost of the winding assembly is high.
Disclosure of Invention
The embodiment of the invention provides a winding assembly, a generator and a wind generating set.
In one aspect, a winding assembly is provided according to an embodiment of the present invention, including: the iron core comprises an iron core body, a plurality of mounting grooves and a plurality of connecting grooves, wherein the iron core body is provided with a central axis and the mounting grooves are distributed around the central axis at intervals; the winding sets up in the iron core body, and the winding includes a plurality of branches, and each branch road includes a plurality of coils respectively, and every coil includes the turn of a line of a plurality of range upon range of settings, and the turn of a line is provided with insulation system, and the insulation system's of two at least coils of same branch road insulating strength is different.
According to an aspect of an embodiment of the invention, the breakdown voltages of the insulation structures of at least two coils of the same branch are different.
According to an aspect of an embodiment of the invention, the resistivity of the insulation structure of at least two coils of the same branch is different.
According to an aspect of an embodiment of the invention, the insulation structures of at least two coils of the same branch have different partial discharge resistance.
According to an aspect of an embodiment of the present invention, the plurality of coils of the same branch include a first coil, a last coil, and a middle coil electrically connected between the first coil and the last coil, the first coil having a first lead-out terminal, the last coil having a second lead-out terminal; the partial discharge resistance of the insulating structure of the first coil is greater than that of the insulating structure of the middle coil, the partial discharge resistance of the insulating structure of the last coil is greater than that of the insulating structure of the middle coil, and the partial discharge resistance of the insulating structure of the first coil is equal to that of the insulating structure of the last coil.
According to an aspect of the embodiment of the present invention, the insulation structure of the leading coil and the insulation structure of the trailing coil each include a first insulator, the insulation structure of each intermediate coil includes a second insulator, and the partial discharge resistance of the first insulator is greater than the partial discharge resistance of the second insulator.
The first insulator comprises at least one of mica, a corona-resistant film and corona-resistant wire enamel, and the second insulator comprises at least one of an organic film layer, wire enamel and glass polyester yarns.
According to an aspect of the embodiment of the present invention, a material of the first insulator is the same as a material of the second insulator;
the thickness of each turn of the first insulator on the first coil is larger than that of each turn of the second insulator on the corresponding middle coil, and the thickness of each turn of the first insulator on the last coil is larger than that of each turn of the second insulator on the corresponding middle coil.
According to an aspect of the embodiment of the present invention, the partial discharge resistance of the insulating structure of the plurality of intermediate coils is first decreased and then increased on the electric signal conduction path of the same branch from the first coil to the last coil.
According to an aspect of the embodiment of the present invention, an absolute value of a difference in width dimensions of winding coils of the insulation structure on any two of the turns in a circumferential direction of the core body is less than or equal to 0.15 mm.
According to an aspect of the embodiment of the present invention, there is also a conductor line between turns, and an absolute value of a difference in width dimensions of the conductor lines of any two of the turns in a circumferential direction of the core body is less than or equal to 0.2 mm.
According to one aspect of the embodiment of the invention, two coils are arranged in each mounting groove, the two coils positioned in the same mounting groove are distributed at intervals and arranged in an insulating manner along the radial direction of the iron core body, and each coil at least partially protrudes out of the mounting groove along the extension direction of the central axis and is electrically connected with other coils of the same branch.
In another aspect, a generator is provided according to an embodiment of the present invention, including a stator; the rotor is coaxially arranged with the stator and is in rotating fit with the stator, wherein at least one of the rotor and the stator comprises the winding assembly.
In another aspect, a wind turbine generator set is provided according to an embodiment of the present invention, which includes the above-mentioned generator.
According to the winding assembly, the generator and the wind generating set provided by the embodiment of the invention, the winding assembly comprises the iron core body and the winding, the winding is arranged on the iron core body and comprises a plurality of branches, each branch comprises a plurality of coils, each coil respectively comprises a plurality of stacked coil lines, an insulation structure is arranged on each coil line, and the insulation strength of the insulation structures of at least two coils of the same branch is different, so that the corresponding insulation structures can be matched according to the parameters such as the strength, the probability and the like of partial discharge born by each coil of the same branch, the voltage strength of each insulation structure can meet the requirements of the area where the winding is located, and the cost can be reduced.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a wind turbine generator system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a partial structure of a generator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of a winding assembly according to one embodiment of the present invention;
FIG. 4 is a top view of a winding assembly according to one embodiment of the present invention;
fig. 5 is a schematic structural view of a core body according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating the engagement of the coil with the mounting groove of the core body according to an embodiment of the present invention;
FIG. 7 is a graph of pulse voltage versus time experienced by a winding assembly provided in accordance with an embodiment of the present invention in use;
FIG. 8 is a schematic diagram of the structure of a coil in accordance with one embodiment of the present invention;
FIG. 9 is a schematic view of a partial structure of a generator according to another embodiment of the present invention;
FIG. 10 is a partial schematic view of the primary coil according to one embodiment of the present invention;
fig. 11 is a partial structural view of the intermediate coil according to an embodiment of the present invention.
Wherein:
1-a generator;
110-a rotor; 120-a stator; 130-neutral ring; 140-phase ring;
100-a winding assembly;
10-an iron core body; 11-mounting grooves;
20-winding; 20 a-branch; 21-a coil; 211-turns of wire; 211 a-conductor line; 211 b-insulating structure; 211c — first insulator; 212 d-second insulator; 2111-top level edge; 2112-lower level edge;
212-first outlet connection; 213-second outlet connection;
21 a-primary coil; 21 b-last coil; 21 c-middle coil;
2-a tower; 3-a cabin; 4-an impeller; 401-a hub; 402-a blade;
x-circumferential direction; y-radial direction.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following description is given with the directional terms shown in the drawings and is not intended to limit the specific structure of the winding assembly, the generator and the wind turbine generator set of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides a wind turbine generator set, which includes a tower 2, a nacelle 3, a generator 1, and an impeller 4. The tower 2 is connected to a wind turbine foundation, the nacelle 3 is arranged on top of the tower 2, the nacelle 3 comprises a base, and the nacelle 3 can be connected with the tower 2 and the generator 1 through the base. The generator 1 is provided at the nacelle 3, and in some examples, the generator 1 may be located outside the nacelle 3. The impeller 4 includes a hub 401 and a plurality of blades 402 connected to the hub 401.
As shown in fig. 2 and fig. 3, the generator 1 provided by the embodiment of the present invention optionally includes a rotor 110 and a stator 120 which are rotationally matched, the rotor 110 may be connected to the hub 401, and the stator 120 may be connected to the base of the nacelle 3. When wind power acts on the blades 402, the blades 402 drive the hub 401 to rotate, and the hub 401 drives the rotor 110 of the generator 1 to rotate relative to the stator 120 through a shafting structure, so that the power generation requirement of the wind generating set is met.
The rotor 110 and the stator 120 of the generator 1 both include a winding assembly 100, the winding assembly 100 includes an iron core body 10 and a winding 20, and because the generator 1 needs to be controlled by a frequency converter during operation, a high-order pulse voltage of MHz level can be generated by opening and closing an Insulated Gate Bipolar Transistor (IGBT) switch in the frequency converter. When a high-order pulse voltage is transmitted in the coil 21 of the winding assembly 100, the high-order pulse voltage affects the corresponding coil 21 of the same branch, so the generator 1 controlled by the frequency converter generally has an insulation structure to bear the electrical stress generated when the high-order pulse voltage is transmitted.
The insulating strength capability of the insulating structure of each coil of the winding assembly of the conventional generator is consistent, the insulating structure of the turn line of each coil is usually arranged by taking the coil which can bear the highest electric stress influence generated by high-order pulse voltage as a reference, and the insulating structure bearing the highest electric stress is usually expensive, so that the overall cost of the winding assembly is higher.
Therefore, to solve the above technical problems, embodiments of the present invention provide a novel winding assembly 100, which can ensure safety and is low in cost. For a better understanding of the winding assembly 100 provided by the embodiment of the present invention, the following description is made in detail with reference to fig. 3 to 11 for the winding assembly 100 according to the embodiment of the present invention.
As shown in fig. 3 to 6, a winding assembly 100 according to an embodiment of the present invention includes a core body 10 and a winding 20, wherein the core body 10 has a central axis aa and a plurality of mounting slots 11 spaced around the central axis aa. The winding 20 is disposed on the core body 10, the winding 20 includes a plurality of branches 20a, each branch 20a includes a plurality of coils 21, each coil 21 includes a plurality of stacked turns 211, each turn 211 is provided with an insulation structure 211b, and the insulation strength of the insulation structures 211b of at least two coils 21 of the same branch 20a is different.
When the winding assembly 100 provided by the embodiment of the present invention is used in the generator 1, the stator 120 of the generator 1 may include the winding assembly 100, and of course, the rotor 110 may also include the winding assembly 100. According to the winding assembly 100 provided by the embodiment of the invention, the insulation strength of the insulation structures 211b of at least two coils 21 of the same branch 20a is different, and the corresponding insulation structures 211b can be matched according to the parameters such as the strength, probability and the like of partial discharge borne by each coil 21 of the same branch 20a, so that the voltage strength of each insulation structure 211b can meet the requirement of the area where the insulation structure is located, and the cost can be reduced.
In addition, if the insulation structure 211b of the turn line 211 of each coil 21 is provided based on the coil 21 which has the largest influence of the high-order pulse voltage, taking the thickness of the insulation structure 211b as an example and generally ranging from 0.4mm to 0.55mm, if the number of turns of the single-layer coil 21 is assumed to be 10 turns to 12 turns, and if the two-layer coil 21 is 20 turns to 24 turns, the sum of the thicknesses of the turn-to-turn insulation structures 211b in the groove depth direction is 8mm to 13.2 mm. The rotor 110 and the stator 120 of the MW-level direct-drive wind generating set are large in size, the using amount of effective materials is very large, and the proportion of the effective materials, namely conductor wires, in the product cost is very high, so that the improvement of the utilization rate of the effective materials is an important working direction.
In the winding assembly 100 provided in the embodiment of the present invention, the insulation strength of the insulation structures 211b of at least two coils 21 of the same branch 20a is different, and the corresponding insulation structures 211b are matched according to the parameters such as the strength and probability of the partial discharge borne by each coil 21 of the same branch 20a, so that the insulation structure 211b of the coil 21 having a low requirement on the insulation strength can be set to be relatively thin, the utilization rate of the effective material of the winding assembly 100 is improved, and the performance of the winding assembly 100 is optimized. Furthermore, by thinning the insulation structure 211b of the partial coil 21c, the heat dissipation capability of the winding assembly 100 is also improved.
Optionally, in the winding assembly 100 provided in the embodiment of the present invention, the core body 10 may be a cylindrical structural body having a cavity, and the number of the mounting slots 11 provided on the core body 10 may be arranged into a plurality of 36, 48, 288, and the like according to the result of electromagnetic calculation. Of course, the number of the mounting slots 11 may be determined according to the number of the branches 20a included in the winding assembly 100 and the number of the coils 21 included in each branch 20a, and is not limited by specific values.
As an alternative implementation manner, the winding assembly 100 provided in the embodiment of the present invention may include the mounting groove 11 that is a strip-shaped groove, and the strip-shaped groove may extend along the radial direction Y of the core body 10 by a predetermined length. Alternatively, the coils 21 included in each branch 20a may be distributed along the circumferential direction X of the core body 10 and may be located in different mounting grooves 11.
Alternatively, more than two coils 21 comprised by each branch 20a may be electrically connected, optionally in series. Alternatively, each turn line 211 may include a conductor line 211a and an insulating structure 211b provided to cover the conductor line 211a, the conductor line 211a being the above-mentioned effective material.
As an alternative embodiment, the breakdown voltages of the insulating structures 211b of at least two coils 21 in the same branch 20a may be made different. With the above arrangement, it is possible to make the insulating structures 211b having different breakdown voltages have different insulating strengths. The location in each branch 20a where the intensity of the partial discharge to be sustained is high may be set such that the breakdown voltage of the insulating structure 211b of the coil 21 thereof is higher, while the breakdown voltage of the insulating structure 211b of the coil 21 is set lower for the location in the branch 20a where the intensity of the partial discharge to be sustained is low. The corresponding insulating structures 211b are matched according to the parameters such as the intensity, probability and the like of the partial discharge born by each coil 21 of the same branch 20a, so that the voltage intensity of each insulating structure 211b can meet the requirement of the area where the insulating structure is located, and the cost is reduced.
In some alternative embodiments, the resistivity of the insulating structures 211b of at least two coils 21 of the same leg 20a is different. With the above arrangement, the insulating structures 211b having different resistivity can be made to have different insulating strengths. The breakdown voltage of the insulating structure 211b of the coil 21 at the position of each branch 20a where the local discharge strength required to be borne is high can be made higher, and the breakdown voltage of the insulating structure 211b of the coil 21 at the position of the branch 20a where the local discharge strength required to be borne is low is set to be lower, so that the voltage strength of the insulating structure 211b at each position can meet the requirement of the area where the voltage strength of the insulating structure 211b at each position can meet according to the local discharge strength and probability and other parameters borne by each coil 21 of the same branch 20a and the corresponding insulating structure 211b is matched, and the cost is reduced.
As an alternative embodiment, the insulating structures 211b of at least two coils 21 of the same branch 20a have different partial discharge resistances. Through the arrangement, the position of the branch 20a, which needs to bear high partial discharge strength, can be made to have the partial discharge resistance of the insulating structure 211b of the coil 21 higher, and the position of the branch 20a, which needs to bear low partial discharge strength, can be made to have the partial discharge resistance of the insulating structure 211b of the coil 21 lower, so that the voltage strength of the insulating structure 211b at each position can meet the requirement of the area, and the cost is reduced.
As shown in fig. 3 to 8, in some alternative embodiments, the plurality of coils 21 of the same branch 20a includes a leading coil 21a, a trailing coil 21b, and an intermediate coil 21c electrically connected between the leading coil 21a and the trailing coil 21b, the leading coil 21a having a first lead-out terminal 212, and the trailing coil 21b having a second lead-out terminal 213. The first outgoing connection 212 on the first coil 21a is used for connection to the neutral ring 130, wherein the partial discharge resistance of the insulating structure 211b of the first coil 21a is greater than the partial discharge resistance of the insulating structure 211b of the intermediate coil 21c, and the partial discharge resistance of the insulating structure 211b of the last coil 21b is greater than the partial discharge resistance of the insulating structure 211b of the intermediate coil 21 c.
Alternatively, the coils 21 in the same branch 20a are connected in series, and they may be staggered inside and outside in the circumferential direction X.
As mentioned above, since the generator 1 needs to be controlled by a frequency converter when operating, the high-order pulse voltage of MHz level is generated by the opening and closing of the edge gate bipolar transistor switch in the frequency converter.
As shown in fig. 7, each level is preceded by a pulse voltage with a short rising edge time or falling edge time, which can be more than 2 times the level voltage. The rise time of the pulse voltage is very short, typically between several tens of nanoseconds and 2 microseconds, and such electrical characteristics cause the first coil 21a and the last coil 21b in each branch 20a to distribute a relatively high voltage, respectively, and very large electrical stress is generated in the first coil 21a and the last coil 21 b. Such electrical stress may cause partial discharges inside the coil 21, which may damage the insulating structure 211b, resulting in a failure of the insulation between the turns 211 and the ground, causing damage to the winding assembly 100 and even to the generator 1 to which it is applied. In order to cope with such a stress environment, a partial discharge resistant structure is generally added to the insulation system. When the motor is produced and manufactured at present, all coils 21 are the same inter-turn insulation structure 211b, the occupation ratio of the first coil 21a and the last coil 21b in the whole winding assembly is not very large, and the occupation ratio is 15% -30% for a direct-drive wind driven generator generally. If an insulation structure 211b consistent with the first coil 21a and/or the last coil 21b is added between turns of each coil 21 in each branch 20a, the insulation protection of the first coil 21a and the last coil 21b of the whole non-branch 20a of the motor is redundant and wasted.
In the winding assembly 100 provided in the embodiment of the present invention, the partial discharge resistance of the insulating structure 211b of the first coil 21a is greater than the partial discharge resistance of the insulating structure 211b of the middle coil 21c, and the partial discharge resistance of the insulating structure 211b of the last coil 21b is greater than the partial discharge resistance of the insulating structure 211b of the middle coil 21c, so that the corresponding insulating strength of each coil 21 can be reasonably distributed according to the situation of the voltage force borne by each coil 21 of each branch 20a, and further, the safety of the coil 21 of each branch 20a when bearing partial discharge is ensured, the cost of the winding assembly 100 is reduced, the thickness of the insulating structure 211b of the middle coil 21c with smaller electrical stress can be effectively reduced, the occupation ratio of the whole effective material of the winding 20 is increased, and the performance of the winding assembly 100 is optimized.
As shown in fig. 8 and 9, in order to better understand the winding assembly 100 provided in the embodiment of the present invention, taking an example that one of the branches 20a includes 8 coils 21, each coil 21 has an upper layer side 2111, a lower layer side 2112, a first lead and a second lead, the first lead is connected to the upper layer side 2111, the second lead is connected to the lower layer side 2112, the 8 coils 21 may be distributed along the circumferential direction X of the core body 10, the first leads of two adjacent coils 21 are connected to each other or the second leads are connected to each other, so that the 8 coils 21 are connected in series.
For example, taking the example that the core body 10 includes 288 mounting slots 11, the 8 coils 21 of the branch 20a can be sequentially placed in the 1 st, 4 th, 7 th, 10 th, 13 th, 16 th, 19 th and 22 th mounting slots 11. In the 8 coils 21, the first lead wire 1a of the first coil is led out as a first lead-out connector 212 and used for being connected with the neutral ring 130, the second lead wire 1b of the first coil is connected with the second lead wire 4b of the second coil, the first lead wire 4a of the second coil is connected with the first lead wire 7a of the third coil, the second lead wire 7b of the third coil is connected with the second lead wire 10b of the fourth coil, the first lead wire 10a of the fourth coil is connected with the first lead wire 13a of the fifth coil, the second lead wire 13b of the fifth coil is connected with the second lead wire 16b of the sixth coil, the first lead wire 16a of the sixth coil is connected with the first lead wire 19a of the seventh coil, the second lead wire 19b of the seventh coil is connected with the second lead wire 22b of the eighth coil, and the first lead wire 22a of the eighth coil is led out as a second lead-out connector 213 and used for being connected with the phase ring 140. In this branch 20a, the first coil is called the first coil 21a, the eighth coil is called the last coil 21b, and the second to seventh coils are called the middle coils 21 c.
As an alternative embodiment, the partial discharge resistance of the insulating structure 211b of the first coil 21a is equal to that of the insulating structure 211b of the last coil 21b, so that the consistency of the pressure bearing capacity of the first coil 21a and the last coil 21b can be ensured, and the performance of the winding 20 can be optimized.
In some alternative embodiments, as shown in fig. 10, the insulating structure 211b of the leading coil 21a and the insulating structure 211b of the trailing coil 21b may each include a first insulator 211 c. As shown in fig. 11, the insulating structure 211b of each intermediate coil 21c includes a second insulator 211d, and the partial discharge resistance of the first insulator 211c is larger than that of the second insulator 211 d. The first insulator 211c and the second insulator 211d may be made of different materials, and the first insulator 211c and the second insulator 211d made of different materials satisfy the requirement that the partial discharge resistance of the first coil 21a and the last coil 21b is larger than that of the intermediate coil 21 c.
In some alternative embodiments, the first insulator 211c may include mica, such as at least one of mica tape, corona-resistant film and enamel layer with filler corona-resistant wire enamel, and the second insulator 211d includes at least one of organic film layer, wire enamel, glass polyester fiber and other non-first insulators 211c, which can satisfy the requirements of the first coil 21a, the last coil 21b and the middle coil 21c of the same branch 20a for partial discharge resistance.
In some alternative embodiments, the first insulator 211c may be made to include a mica tape, and the second insulator 211d may be made to include an organic film layer. Of course, in some embodiments, the first insulator 211c may also include a paint layer with filler, and the second insulator 211d may include glass polyester yarn, etc., as long as the requirements of the first coil 21a, the last coil 21b, and the middle coil 21c on the partial discharge resistance can be met, and meanwhile, the cost can be saved, and the utilization rate of effective materials can be improved.
It is understood that the winding assembly 100 provided in the above embodiments of the present invention is exemplified by using different materials for the first insulator 211c and the second insulator 211d, which is an alternative embodiment.
In some embodiments, the materials of the first material body and the second material body may be the same, and a thickness dimension of the first insulator 211c in the direction in which the turns 211 of the first coil 21a are arranged is larger than a thickness dimension of the second insulator 211d in the direction in which the turns 211 of the corresponding intermediate coil 21c are arranged, and a thickness dimension of the first insulator 211c in the direction in which the turns 211 of the corresponding intermediate coil 21b are arranged is larger than a thickness dimension of the second insulator 211d in the direction in which the turns 211 of the corresponding intermediate coil 21c are arranged. The first insulator 211c and the second insulator 211d are made of the same material, the thickness dimension of the insulating structure 211b on the first coil 21a and the last coil 21b is made larger than the thickness dimension of the insulating structure 211b of the middle coil 21c, the partial discharge resistance of the first coil 21a and the last coil 21b with large thickness dimension is made stronger than the partial discharge resistance of the middle coil 21c with small thickness dimension, and the thickness dimension of the insulating structure 211b on the middle coil 21c is made smaller, so that the occupation ratio of the insulating structure 211b of the middle coil 21c corresponding to each branch 20a of the winding assembly 100 is made smaller, the occupation ratio of the corresponding effective material or the conductor wire 211a of the middle coil 21c is improved, and the slot filling ratio is improved.
After the groove filling rate is improved, the current density can be reduced under the same condition. The resistance of the conductor line 211a is inversely proportional to the cross-sectional area for the same length, and the larger the cross-sectional area is, the smaller the resistance of the conductor line 211a is, and the smaller the loss of the conductor line 211a is. In the wind turbine generator system, the conductor loss ratio of the loss of the generator 1 is very large, and generally exceeds 80% or more, so the loss value of the conductor line 211a greatly affects the efficiency of the generator 1. The loss of the conductor wire 211a is reduced, the temperature rise of the winding assembly 100 can be reduced, the effective material consumption of the generator 1 can be reduced through lean design, or the equipment capacity of ventilation and heat dissipation is reduced, and the lean design of the generator 1 is beneficially influenced. Moreover, after the insulating structure 211b of the middle coil 21c is thinned, the heat dissipation capability is improved, and if the thickness is reduced to a half, the heat conduction capability at the position is doubled correspondingly, which is beneficial to heat dissipation.
As an alternative embodiment, on the same branch 20a and on the electric signal conducting path from the first coil 21a to the last coil 21b, the partial discharge resistance of the insulating structure 211b of the plurality of intermediate coils 21c is first decreased and then increased. As described above, in the same branch 20a, the first coil 21a and the last coil 21b are subjected to the largest electrical stress, and the middle coil 21c closer to the middle portion is subjected to the relatively smaller electrical stress. Through setting up in same branch road 20a and by first coil 21a to last coil 21 b's electric signal conduction path, the resistant partial discharge ability of a plurality of middle coil 21 c's insulation system 211b reduces earlier afterwards increases for the corresponding insulation system 211b of intensity and the matching of probability isoparametric of the partial discharge that each coil 21 of same branch road 20a bore, and then make the voltage strength of each insulation system 211b can satisfy the regional requirement of place, reach the demand that reduces this and optimize winding 20 performance. In some optional embodiments, the absolute value of the difference between the width dimensions of the insulating structures 211b on any two turns 211 in the circumferential direction X of the core body 10 is less than or equal to 0.15mm, and optionally less than 0.05 mm.
As an alternative embodiment, the absolute value of the difference between the width dimensions of the conductor wires 211a of any two turns 211 in the circumferential direction X of the core body 10 is less than or equal to 0.2mm, and by the above arrangement, the uniformity of the wire width can be ensured as much as possible, and connection of the connection wires between the coils 21, such as welding at the time of lapping, can be facilitated.
In some optional embodiments, in the winding assembly 100 provided in the embodiment of the present invention, two coils 21 are disposed in each mounting groove 11, the two coils 21 located in the same mounting groove 11 are spaced apart and insulated along the radial direction Y of the core body 10, and each coil 21 at least partially protrudes from the mounting groove 11 along the extending direction of the central axis aa and is electrically connected to other coils 21 of the same branch 20 a. By arranging two coils 21 in each mounting groove 11, the arrangement number of the coils 21 on the iron core body 10 and the compactness of the coils 21 can be improved, and the volume of the winding assembly 100 is reduced.
It is understood that the number of coils 21 disposed in each mounting slot 11 of the winding assembly 100 provided in the embodiment of the present invention is not limited to two, and may be one. Of course, in some embodiments, there may be more than two, such as three, which may be determined according to the size of the core body 10, the number of the mounting slots 11 included, and the number of the coils 21, and is not limited herein.
According to the winding assembly 100 provided by the embodiment of the invention, the insulation strength of the insulation structures 211b of at least two coils 21 of the same branch 20a is different, and the corresponding insulation structures 211b can be matched according to the parameters such as the strength, probability and the like of partial discharge borne by each coil 21 of the same branch 20a, so that the voltage strength of each insulation structure 211b can meet the requirement of the area where the insulation structure is located, and the cost can be reduced.
In the generator 1 provided by the embodiment of the present invention, one or both of the stator 120 and the rotor 110 may include the winding assembly 100 provided by each of the embodiments, and through the above arrangement, the power generation requirement of the generator 1 can be ensured, the cost of the generator 1 can be reduced, and the power generation benefit of the wind turbine generator and other devices to which the generator 1 is applied can be improved.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (12)
1. A winding assembly (100), comprising:
the iron core comprises an iron core body (10), wherein the iron core body (10) is provided with a central axis (aa) and a plurality of mounting grooves (11) distributed at intervals around the central axis (aa);
the winding (20) is arranged on the iron core body (10), the winding (20) comprises a plurality of branches (20a), each branch (20a) comprises a plurality of coils (21), each coil (21) comprises a plurality of stacked turns (211), each turn (211) is provided with an insulation structure (211b), and the insulation strength of the insulation structures (211b) of at least two coils (21) of the same branch (20a) is different.
2. The winding assembly (100) according to claim 1, characterized in that the breakdown voltages of the insulating structures (211b) of at least two of the coils (21) of the same branch (20a) are different;
and/or the resistivity of the insulating structures (211b) of at least two of the coils (21) of the same branch (20a) is different.
3. The winding assembly (100) according to claim 1 or 2, wherein the insulating structures (211b) of at least two of the coils (21) of the same branch (20a) have different partial discharge resistance.
4. The winding assembly (100) according to claim 3, wherein the plurality of coils (21) of the same branch (20a) comprise a first coil (21a), a last coil (21b) and an intermediate coil (21c) electrically connected between the first coil (21a) and the last coil (21b), the first coil (21a) having a first outgoing connector (212) and the last coil (21b) having a second outgoing connector (213);
wherein the partial discharge withstand capability of the insulating structure (211b) of the leading coil (21a) is greater than the partial discharge withstand capability of the insulating structure (211b) of the middle coil (21c), the partial discharge withstand capability of the insulating structure (211b) of the trailing coil (21b) is greater than the partial discharge withstand capability of the insulating structure (211b) of the middle coil (21c), and the partial discharge withstand capability of the insulating structure (211b) of the leading coil (21a) is equal to the partial discharge withstand capability of the insulating structure (211b) of the trailing coil (21 b).
5. The winding assembly (100) according to claim 4, wherein the insulating structure (211b) of the leading winding (21a) and the insulating structure (211b) of the trailing winding (21b) each comprise a first insulator (211c), the insulating structure (211b) of each of the intermediate windings (21c) each comprise a second insulator (211d), and the first insulator (211c) has a partial discharge resistance greater than that of the second insulator (211 d).
6. The winding assembly (100) of claim 5, wherein the first insulator (211c) comprises at least one of mica, corona resistant film and corona resistant wire enamel, and the second insulator (211d) comprises at least one of organic film layer, wire enamel, glass polyester filament.
7. The winding assembly (100) of claim 5, wherein the material of the first insulator (211c) is the same as the material of the second insulator (211 d);
wherein a thickness dimension of the first insulator (211c) in a direction in which the turns (211) of the first coil (21a) are arranged is larger than a thickness dimension of the second insulator (211d) in a direction in which the turns (211) of the intermediate coil (21c) are arranged, and a thickness dimension of the first insulator (211c) in a direction in which the turns (211) of the last coil (21b) are arranged is larger than a thickness dimension of the second insulator (211d) in a direction in which the turns (211) of the intermediate coil (21c) are arranged.
8. The winding assembly (100) according to claim 4, wherein the partial discharge resistance of the insulating structure (211b) of a plurality of intermediate coils (21c) is first reduced and then increased on the same branch (20a) and on the electrical signal conduction path from the first coil (21a) to the last coil (21 b).
9. The winding assembly (100) according to claim 1, wherein an absolute value of a difference in width dimensions of the insulating structures (211b) on any two of the turns (211) in a circumferential direction (X) of the core body (10) is less than or equal to 0.15 mm;
and/or the turns (211) further have conductor lines (211a), and the absolute value of the difference in width dimensions of the conductor lines (211a) of any two of the turns (211) in the circumferential direction (X) of the core body (10) is less than or equal to 0.2 mm.
10. The winding assembly (100) according to claim 1, wherein two coils (21) are disposed in each mounting groove (11), two coils (21) located in the same mounting groove (11) are spaced apart and insulated in a radial direction (Y) of the core body (10), and each coil (21) at least partially protrudes from the mounting groove (11) along an extending direction of the central axis (aa) and is electrically connected to other coils (21) of the same branch (20 a).
11. An electrical generator, comprising:
a stator (120);
-a rotor (110) coaxially arranged and rotationally engaged with the stator (120), wherein at least one of the rotor (110) and the stator (120) comprises a winding assembly (100) according to any one of claims 1 to 10.
12. A wind power plant comprising a generator according to claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521215.8A CN113328551A (en) | 2021-05-13 | 2021-05-13 | Winding assembly, generator and wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521215.8A CN113328551A (en) | 2021-05-13 | 2021-05-13 | Winding assembly, generator and wind generating set |
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| Publication Number | Publication Date |
|---|---|
| CN113328551A true CN113328551A (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110521215.8A Pending CN113328551A (en) | 2021-05-13 | 2021-05-13 | Winding assembly, generator and wind generating set |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6225564B1 (en) * | 1995-08-24 | 2001-05-01 | Voith Siemens Hydro Power Generation Inc. | Coil turn insulation system for high voltage machines |
| CN1495985A (en) * | 2002-09-17 | 2004-05-12 | 株式会社电装 | High voltage electric rotary machine |
| US20110109188A1 (en) * | 2009-11-10 | 2011-05-12 | Shaver Clark D | Partial Discharge Resistant Motor Slot Insulation |
| CN102916513A (en) * | 2012-10-18 | 2013-02-06 | 山东华力电机集团股份有限公司 | Motor winding capable of effectively increasing turn-to-turn insulation capacity |
| CN204231052U (en) * | 2014-10-14 | 2015-03-25 | 泉州开普勒车用电机有限公司 | A kind of modified node method of generator lenticular wire stator |
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2021
- 2021-05-13 CN CN202110521215.8A patent/CN113328551A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6225564B1 (en) * | 1995-08-24 | 2001-05-01 | Voith Siemens Hydro Power Generation Inc. | Coil turn insulation system for high voltage machines |
| CN1495985A (en) * | 2002-09-17 | 2004-05-12 | 株式会社电装 | High voltage electric rotary machine |
| US20110109188A1 (en) * | 2009-11-10 | 2011-05-12 | Shaver Clark D | Partial Discharge Resistant Motor Slot Insulation |
| CN102916513A (en) * | 2012-10-18 | 2013-02-06 | 山东华力电机集团股份有限公司 | Motor winding capable of effectively increasing turn-to-turn insulation capacity |
| CN204231052U (en) * | 2014-10-14 | 2015-03-25 | 泉州开普勒车用电机有限公司 | A kind of modified node method of generator lenticular wire stator |
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Application publication date: 20210831 |