Rotor structure and doubly-fed wind turbine generator

Abstract

The present invention provides a rotor structure and a doubly-fed wind power generator, which relate to the technical field of generators. The rotor structure includes a first end and a second end that are arranged opposite to each other, the first end being a non-lead end, and the second end being a lead end. The first end is provided with a first parallel head and a second parallel head, the first parallel head and the second parallel head are arranged at intervals, and the first parallel head is provided with an insulating sleeve. The second end is provided with a third parallel head, a fourth parallel head and a wiring parallel head, the third parallel head, the fourth parallel head and the wiring parallel head are arranged at intervals, the third parallel head is provided with an insulating sleeve, the wiring parallel head is arranged adjacent to the third parallel head, and the wiring parallel head is used to connect the leads. The rotor has a simple structure, high versatility, simple process, and is also conducive to improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and in particular to a rotor structure and a doubly-fed wind generator. Background Art

[0002] With the rush to install wind turbines, the industry is improving production efficiency, improving the quality of generator production processes and reducing costs. The variable speed constant frequency double-fed asynchronous wind turbine with the most development potential currently requires copper brazing of the rotor windings before insulation treatment. In addition, the existing parallel head insulation treatment has a complex structure, high cost and low efficiency. Summary of the invention

[0003] The objects of the present invention include, for example, providing a rotor structure and a doubly-fed wind turbine generator with a simple structure, a simple process, cost savings, and the benefit of improving production efficiency.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, this embodiment provides a rotor structure, including a rotor winding, wherein the rotor winding includes a first end and a second end that are oppositely arranged, wherein the first end is a non-lead end, and the second end is a lead end;

[0006] The first end portion is provided with a first parallel head and a second parallel head, the first parallel head and the second parallel head are arranged at intervals, and the first parallel head is provided with an insulating sleeve;

[0007] The second end is provided with a third parallel head, a fourth parallel head and a wiring parallel head, the third parallel head, the fourth parallel head and the wiring parallel head are arranged at intervals, the third parallel head is covered with the insulating sleeve, the wiring parallel head is arranged adjacent to the third parallel head, and the wiring parallel head is used to connect the lead wire.

[0008] In an optional embodiment, one second parallel head is provided between two adjacent first parallel heads, and one first parallel head is provided between two adjacent second parallel heads.

[0009] In an optional implementation, both adjacent sides of the wiring parallel head are the third parallel heads, and the fourth parallel heads are alternately arranged with the third parallel heads.

[0010] In an optional embodiment, the insulating sleeve is respectively sleeved on the first parallel head and the second parallel head.

[0011] In an optional embodiment, the insulating sleeve is a silicone rubber glass fiber varnish tube.

[0012] In an optional embodiment, the wiring joint is made of two layers of mica tape that are half-overlapped, and a glass ribbon is fixed on the mica tape.

[0013] In an optional embodiment, the first and second ends are fixed by using a non-weft belt, and the third, fourth and connecting ends are fixed by using a non-weft belt.

[0014] In an optional embodiment, the first parallel head, the second parallel head, the third parallel head, the fourth parallel head and the wiring parallel head are all provided with a protective paint layer.

[0015] In an optional embodiment, the rotor winding adopts a wound wave winding.

[0016] In a second aspect, this embodiment provides a doubly-fed wind turbine generator, comprising a rotor structure as described in any one of the aforementioned embodiments.

[0017] The rotor structure and the doubly-fed wind turbine generator provided by the present invention have the following beneficial effects, for example:

[0018] The rotor structure provided by the present invention is provided with a first parallel head and a second parallel head at the non-lead end of the rotor winding, wherein an insulating sleeve is provided only on the first parallel head, which greatly reduces the material cost, and has a simpler process, more convenient operation, and high assembly efficiency. At the lead end of the rotor winding, an insulating sleeve is provided on the third parallel head, and the two parallel heads adjacent to each wiring parallel head are both third parallel heads provided with insulating sleeves. This arrangement can save material costs, has high flexibility, has a larger operating space for the sleeve setting, and has a simpler and more convenient process, which is conducive to improving production efficiency.

[0019] The doubly-fed wind turbine provided by the present invention includes the rotor structure as described above. When the rotor head insulation structure is processed, the process is simple, the operation is convenient, the material cost is saved, and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a non-lead end of a rotor structure provided by a specific embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of a lead terminal of a rotor structure provided in a specific embodiment of the present invention;

[0023] Figure 3 for Figure 1A partial enlarged view of the middle A;

[0024] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure.

[0025] Icons: 100-rotor structure; 101-first end; 103-second end; 30-rotor body; 31-mounting hole; 120-first parallel end; 130-second parallel end; 140-insulating sleeve; 150-weft-free belt; 220-third parallel end; 230-fourth parallel end; 240-wiring parallel end; 241-lead. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0032] With the rush to install wind turbines, the industry is improving production efficiency, improving the quality of motor production processes and reducing costs. Take the variable speed constant frequency double-fed asynchronous wind turbine, which has the most development potential, as an example. In this wind turbine, the stator is directly connected to the power grid, and the rotor is connected to the power grid through a bidirectional inverter. The rotor winding is a wound wave winding, and the upper and lower windings are connected by parallel wedges and then copper brazed, and then insulated. The existing parallel insulation treatment of the rotor winding is complex, costly and inefficient.

[0033] In order to improve the defects of the prior art, the present application provides a rotor structure 100, which has a simple rotor head insulation structure, is easy to operate, saves costs, saves time and effort, reduces labor intensity, and greatly improves production efficiency.

[0034] First embodiment

[0035] Please refer to Figure 1 and Figure 2 This embodiment provides a rotor structure 100, including a rotor winding, wherein the rotor winding includes a first end 101 and a second end 103 arranged opposite to each other, wherein the first end 101 is a non-lead end, and the second end 103 is a lead end. The first end 101 is provided with a first parallel head 120 and a second parallel head 130, wherein the first parallel head 120 and the second parallel head 130 are arranged at intervals, and the first parallel head 120 is provided with an insulating sleeve 140. Figure 1 The position marked with number 1 indicates the first parallel head 120, and the position marked with number 2 indicates the second parallel head 130. The second end portion 103 is provided with a third parallel head 220, a fourth parallel head 230 and a wiring parallel head 240, which are arranged at intervals. The third parallel head 220 is sleeved with an insulating sleeve 140, and the wiring parallel head 240 is arranged adjacent to the third parallel head 220. The wiring parallel head 240 is used to connect the lead wire 241. Figure 2 The position marked with number 1 represents the third parallel head 220, and the position marked with number 2 represents the fourth parallel head 230. The rotor structure 100 is simple to operate and saves costs by changing the rotor parallel head insulation structure, greatly improving production efficiency and reducing labor intensity.

[0036] Furthermore, in this embodiment, the rotor structure 100 includes a rotor body 30 and a rotor winding, and the rotor winding adopts a wound wave winding. The rotor body 30 is used to support the rotor winding, and a mounting hole 31 is provided at the center of the rotor body 30, and the mounting hole 31 is used to install the rotating shaft. The parallel head insulation structure of the rotor winding is respectively arranged at the first end 101 and the second end 103 that are arranged opposite to each other, wherein the first end 101 serves as the non-lead end of the rotor winding, and the second end 103 serves as the lead end of the rotor winding. Optionally, at the non-lead end of the rotor winding, the parallel head insulation structure is distributed at intervals along the annular direction of the rotor body 30, and each parallel head insulation structure is arranged around the rotor body 30 at equal intervals. In order to improve production efficiency and reduce the labor intensity of workers, in this embodiment, the insulating sleeve 140 is arranged on part of the parallel head insulation structure, which can not only ensure a good insulation effect, but also reduce the workload and reduce the labor intensity of workers.

[0037] In this embodiment, the parallel head structure of the non-lead end is divided into a first parallel head 120 and a second parallel head 130, and one-half of the parallel head structure is sleeved with an insulating sleeve 140, and the other half of the parallel head structure is not sleeved with an insulating sleeve. In order to ensure the uniformity of the distribution of the insulating sleeve 140 and the good insulation characteristics of the rotor winding, the number of the first parallel heads 120 and the number of the second parallel heads 130 each account for half of the total number of parallel heads of the non-lead end. Among them, the first parallel head 120 is sleeved with an insulating sleeve 140, and the second parallel head 130 is not sleeved with an insulating sleeve 140, and the first parallel heads 120 and the second parallel heads 130 are alternately arranged, that is, a second parallel head 130 is provided between two adjacent first parallel heads 120, and a first parallel head 120 is provided between two adjacent second parallel heads 130. It should be noted that the first parallel head 120 and the second parallel head 130 are only different in that the insulating sleeve 140 is provided and the insulating sleeve 140 is not provided. There is no strict restriction on the order of the first parallel head 120 and the second parallel head 130, as long as the first parallel head 120 and the second parallel head 130 are alternately provided. For example, the parallel head structures of the non-lead ends are numbered in sequence, the odd-numbered ones are the first parallel heads 120, and the even-numbered ones are the second parallel heads 130. In other optional implementations, the even-numbered ones may be defined as the first parallel heads 120, and the odd-numbered ones may be defined as the second parallel heads 130, and no specific limitation is made here, so that the setting of the insulating sleeve 140 is more flexible, with good versatility and high flexibility.

[0038] Of course, it is not limited to this. The number of the first parallel heads 120 and the second parallel heads 130 may also be unequal, for example, two first parallel heads 120 and one second parallel head 130 are alternately arranged; or, two second parallel heads 130 and one first parallel head 120 are alternately arranged; or, two first parallel heads 120 and two second parallel heads 130 are alternately arranged, and the insulating sleeves 140 are respectively sleeved on the first parallel heads 120, and the insulating sleeves 140 are not arranged on the second parallel heads 130, which is not specifically limited here. By selectively sleeve the insulating sleeves 140 on the parallel head structure of the non-lead end, the operation process is simple, the distance between two adjacent insulating sleeves 140 is relatively large, and the operation is convenient, and the number and material of the insulating sleeves 140 are saved, the workload and labor intensity of the workers are reduced, and the production efficiency is improved.

[0039] In this embodiment, the parallel head structure of the lead end is divided into a third parallel head 220, a fourth parallel head 230 and a wiring parallel head 240. The third parallel head 220 is provided with an insulating sleeve 140, and the fourth parallel head 230 is not provided with an insulating sleeve 140. The wiring parallel head 240 is used to connect the lead 241. In the actual production process, in order to ensure that the insulation performance of the parallel head near the lead 241 is good, the two parallel heads adjacent to the wiring parallel head 240 are both sleeved with insulating sleeves 140, that is, the adjacent two sides of the wiring parallel head 240 are both the third parallel heads 220. On the premise that the adjacent two sides of the wiring parallel head 240 are both the third parallel heads 220, the fourth parallel head 230 and the third parallel head 220 are alternately arranged. This arrangement can reduce the number of insulating sleeves 140, save material costs, reduce the workload of workers, and reduce the labor intensity of workers. In addition, the third parallel head 220 and the fourth parallel head 230 are alternately arranged at intervals, and the installation and operation space of the insulating sleeve 140 is larger, which is convenient for operation, improves work efficiency, and thus improves the production efficiency of the rotor winding.

[0040] Please refer to Figure 3 and Figure 4 Furthermore, the insulating sleeve 140 adopts a silicone rubber glass fiber paint tube. The silicone rubber glass fiber paint tube is an insulating tube that is woven, high-temperature treated, and then coated with silicone rubber paste. It has certain dielectric properties and high heat resistance, and is particularly suitable for insulation protection of various electrical appliances. The insulating sleeve 140 is respectively sleeved on the first parallel head 120 and the third parallel head 220. Optionally, a layer of silicone rubber glass fiber paint tube is respectively sleeved on the first parallel head 120 and the third parallel head 220 to achieve a good insulation effect. Of course, it is not limited to this. The material of the insulating sleeve 140 can also be other insulating materials, and the number of layers of the insulating sleeve 140 can be one or more layers, which is not specifically limited here.

[0041] The insulation structure of the wiring header 240 is made of two layers of mica tape, which are half-lapped, and a glass ribbon is fixed on the mica tape, so that the wiring header 240 has good insulation performance. It is easy to understand that the number of layers of the mica tape can be two or more layers, and the number of layers of the glass ribbon can also be one or more layers, which are not specifically limited here. Of course, it is not limited to this, and the insulation structure of the wiring header 240 can also be coated with other insulating materials, which are not specifically limited here.

[0042] In order to improve the structural stability of the rotor winding, the first parallel head 120 and the second parallel head 130 are tied and fixed with a non-weft tape 150 at the non-lead end of the rotor winding; and the third parallel head 220, the fourth parallel head 230 and the connection parallel head 240 are tied and fixed with a non-weft tape 150 at the lead end of the rotor winding. The method of tying and fixing with the non-weft tape 150 is simple and convenient to operate, and the structure is stable and reliable, ensuring good insulation performance of the rotor winding.

[0043] Furthermore, the first parallel head 120, the second parallel head 130, the third parallel head 220, the fourth parallel head 230 and the connection parallel head 240 are all provided with a protective paint layer. The protective paint layer can further improve the insulation performance of the rotor winding and prevent the surface of the winding from being corroded or damaged. Optionally, in this embodiment, a VPI vacuum pressure impregnation method is adopted to ensure the reliability of the insulation of the wind turbine winding as a wound wave winding parallel head. Among them, VPI is the abbreviation of Vacuum Pressure Impregnating, that is, the abbreviation of vacuum pressure impregnation process. The entire rotor winding is treated by vacuum pressure impregnation to ensure that the first parallel head 120, the second parallel head 130, the third parallel head 220, the fourth parallel head 230 and the connection parallel head 240 are all provided with a protective paint layer, thereby further improving the insulation performance of the entire rotor winding.

[0044] The rotor structure 100 provided in this embodiment adopts a wound wave winding for the rotor winding. At the non-lead end of the rotor winding, the first parallel head 120 is sleeved with an insulating sleeve 140, and the second parallel head 130 is not provided with an insulating sleeve 140, so as to improve the insulation performance of the non-lead end of the rotor winding. In this way, the insulation performance of the non-lead end of the rotor winding can be ensured, the safety performance can be improved, and the service life can be extended; the workload can also be reduced and the labor intensity can be reduced. In addition, the first parallel head 120 and the second parallel head 130 are alternately arranged at intervals, and the installation and operation space of the insulating sleeve 140 is large, and the operation is more convenient. At the lead end of the rotor winding, the wiring header 240 is made of two layers of mica tape that are half-overlapped and then fixed with a layer of alkali-free glass ribbon to ensure the insulation performance of the wiring header 240; the two sides of the wiring header 240 and the header structure adjacent to the wiring header 240 are set as a third header 220, and an insulating sleeve 140 is set on the third header 220, that is, it is ensured that the header structures adjacent to the wiring header 240 are all sleeved with insulating sleeves 140 to improve the insulation performance of the rotor winding lead end. The remaining parallel head structures not adjacent to the connection parallel head 240 are divided into a third parallel head 220 and a fourth parallel head 230. According to the regular distribution of the third parallel head 220 and the fourth parallel head 230 arranged alternately, the third parallel head 220 is provided with an insulating sleeve 140, and the fourth parallel head 230 is not provided with an insulating sleeve 140. This can not only ensure the insulation performance and safety performance of the rotor winding lead end and extend the service life, but also reduce the workload and labor intensity, make the process simpler, the operation more convenient, and the production efficiency higher. In addition, by adopting the VPI vacuum pressure impregnation method, the reliability and corrosion resistance of the insulation of the wind turbine generator winding as a winding wave winding parallel head are further ensured, the safety performance is improved, and the service life is extended.

[0045] Second embodiment

[0046] This embodiment provides a doubly-fed wind turbine generator, comprising a stator, a bidirectional frequency converter, and a rotor structure 100 as in any one of the above embodiments. The stator is directly connected to the power grid, and the rotor is connected to the power grid through the bidirectional frequency converter. The rotor winding adopts a wound wave winding, and the non-lead end of the rotor winding adopts a first parallel head 120 and a second parallel head 130 arranged alternately at intervals, the first parallel head 120 is sleeved with an insulating sleeve 140, and the second parallel head 130 is not provided with an insulating sleeve 140. The lead ends of the rotor winding include a third parallel head 220, a fourth parallel head 230 and a connection parallel head 240. The connection parallel head 240 is made of two layers of mica tape that are half-overlapped and then fixed with a layer of alkali-free glass ribbon to ensure the insulation performance of the connection parallel head 240. The third parallel head 220 and the fourth parallel head 230 are arranged alternately at intervals. The third parallel head 220 is provided with an insulating sleeve 140, and the fourth parallel head 230 is not provided with an insulating sleeve 140. In addition, the two parallel head structures adjacent to each connection parallel head 240 are both the third parallel head 220, that is, the two parallel head structures adjacent to each connection parallel head 240 are both provided with an insulating sleeve 140.

[0047] Such a configuration can reduce the amount of insulating sleeve 140 used, save costs, and improve production efficiency. In addition, the rotor winding process is simple, the parts cost is relatively low, it is economical and practical, and has high safety, which is conducive to extending the service life of the rotor structure 100 and the doubly-fed wind turbine generator.

[0048] Other contents not mentioned in this embodiment are similar to those described in the first embodiment and are not specifically limited here.

[0049] The embodiment of the present invention provides a rotor structure 100 and a doubly-fed wind turbine generator, the working principle of which includes:

[0050] In the rotor structure 100 provided by the embodiment of the present invention, at the non-lead end of the rotor winding, the first parallel head 120 and the second parallel head 130 are alternately arranged, the first parallel head 120 is provided with an insulating sleeve 140, and the second parallel head 130 is not provided with an insulating sleeve 140, which saves the amount of insulating sleeve 140, reduces the workload, reduces the labor intensity, and improves the insulation performance of the non-lead end of the rotor winding. The first parallel head 120 and the second parallel head 130 are tied and fixed with a non-weft belt 150 to prevent the failure of the parallel head insulation structure during the high-speed rotation of the rotor. The lead end of the rotor winding includes a third parallel head 220, a fourth parallel head 230 and a connection parallel head 240. The connection parallel head 240 is used to lead out the lead wire 241. The insulation structure of the connection parallel head 240 adopts two layers of mica tape half-lapped and then fixed with a layer of alkali-free glass ribbon. The parallel head structure adjacent to each connection parallel head 240 is set as the third parallel head 220, and an insulating sleeve 140 is set on the third parallel head 220, that is, it is ensured that the two parallel head structures adjacent to each connection parallel head 240 are provided with insulating sleeves 140. The third parallel head 220 and the fourth parallel head 230 are arranged at alternating intervals, wherein the third parallel head 220 is completely covered with insulating sleeves 140, and the fourth parallel head 230 is not provided with insulating sleeves 140. The third parallel head 220, the fourth parallel head 230 and the connection parallel head 240 are tied and fixed with a non-weft belt 150 to prevent the failure of the parallel head insulation structure during the high-speed rotation of the rotor. Finally, the rotor winding is subjected to a VPI vacuum pressure impregnation process, and a protective paint layer is provided on the surface of the rotor winding to further improve the insulation performance of the rotor winding and to provide an anti-corrosion protection. The provision of the rotor winding parallel head insulation structure in this embodiment can save the amount of insulating sleeve 140, reduce the cost of parts, and greatly reduce the workload and the labor intensity of workers.

[0051] In summary, the embodiment of the present invention provides a rotor structure 100 and a doubly-fed wind turbine generator, which have the following beneficial effects:

[0052] The rotor structure 100 and the doubly-fed wind turbine generator provided by the embodiment of the present invention save the amount of insulating sleeve 140 and reduce the cost of parts by changing the parallel insulation structure of the rotor winding, and greatly reduce the workload and the labor intensity of the workers. The rotor structure 100 provided by the embodiment has a simple manufacturing process, convenient operation, high production efficiency, and good insulation performance of the rotor structure 100, long service life, and is suitable for a variety of products, with strong adaptability and good versatility.

[0053] The doubly-fed wind turbine generator provided in the embodiment of the present invention includes the rotor structure 100 as described above. Since the rotor structure 100 has high production efficiency and good insulation performance, it is beneficial to improve the safety of the doubly-fed wind turbine generator, extend its service life, and improve the overall product quality.

[0054] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A rotor structure, It is characterized in that The invention comprises a rotor winding, wherein the rotor winding comprises a first end (101) and a second end (103) which are arranged opposite to each other, wherein the first end (101) is a non-lead end, and the second end (103) is a lead end; The first end (101) is provided with a first parallel head (120) and a second parallel head (130), the first parallel head (120) and the second parallel head (130) are arranged at an interval, and the first parallel head (120) is provided with an insulating sleeve (140); The second end portion (103) is provided with a third parallel head (220), a fourth parallel head (230) and a wiring parallel head (240); the third parallel head (220), the fourth parallel head (230) and the wiring parallel head (240) are arranged at intervals; the third parallel head (220) is sleeved with the insulating sleeve (140); the wiring parallel head (240) is arranged adjacent to the third parallel head (220); and the wiring parallel head (240) is used to connect a lead wire (241); The rotor winding is subjected to a VPI vacuum pressure immersion varnishing process, and a protective varnish layer is provided on the surface of the rotor winding.

2. The rotor structure according to claim 1, It is characterized in that A second parallel head (130) is arranged between two adjacent first parallel heads (120), and a first parallel head (120) is arranged between two adjacent second parallel heads (130).

3. The rotor structure according to claim 1, It is characterized in that The adjacent two sides of the wiring parallel head (240) are both the third parallel heads (220), and the fourth parallel heads (230) and the third parallel heads (220) are arranged alternately.

4. The rotor structure according to claim 1, It is characterized in that The insulating sleeve (140) is respectively sleeved on the first parallel head (120) and the second parallel head (130).

5. The rotor structure according to claim 1, It is characterized in that The insulating sleeve (140) is made of a silicone rubber glass fiber lacquer tube.

6. The rotor structure according to claim 1, It is characterized in that The wiring joint (240) is made of two layers of half-lapped mica tape, and a glass ribbon is fixed on the mica tape.

7. The rotor structure according to claim 1, It is characterized in that The first parallel head (120) and the second parallel head (130) are fixed by a non-weft belt (150), and the third parallel head (220), the fourth parallel head (230) and the connecting parallel head (240) are fixed by a non-weft belt (150).

8. The rotor structure according to any one of claims 1 to 7, It is characterized in that The rotor winding adopts a wound wave winding.

9. A doubly-fed wind turbine generator, It is characterized in that The invention comprises a rotor structure as claimed in any one of claims 1 to 8.

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