Rotor assembly and wind driven generator

Abstract

The invention provides a rotor assembly and a wind driven generator, the rotor assembly comprises a rotating shaft, a rotor winding and a coil connecting piece, a rotor iron core is arranged on the rotating shaft, and the rotor iron core is provided with a plurality of rotor grooves; the rotor winding comprises a plurality of winding coils, a part of each winding coil is embedded in the rotor groove, the plurality of winding coils comprise two first winding coils which are arranged at intervals in the circumferential direction of the rotating shaft, and the two first winding coils are provided with two bridging parts which are located on the same side of the rotor iron core in the axial direction of the rotating shaft; and the two electrically connected coil connecting pieces are respectively arranged on the two bridging parts, so that the two first winding coils are bridged through the two coil connecting pieces. According to the rotor assembly, the notch bridging structure is adopted, the two coil connecting pieces which are electrically connected with each other are arranged at the bridging part of the two first winding coils, notch bridging of the two first winding coils is achieved, and the notch bridging structure can guarantee the connection reliability, simplify the structure and reduce the manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment technology, and in particular to a rotor assembly and a wind turbine generator. Background Technology

[0002] Doubly fed generators, as core equipment in the field of wind power generation, generally adopt a wound-rotor winding structure. For rotor windings with multiple conductors per slot (such as even numbers like 4, 6, 8, etc.), in order to achieve electrical connection of in-phase coils with different polarities, existing technologies mainly adopt two connection methods: end bridging and slot bend bridging.

[0003] The end-bridging method involves extending the coil end and connecting it in series with a bridging copper busbar. However, with the continuous increase in generator power, the cross-sectional area of ​​the rotor winding copper busbar has increased accordingly. This connection method occupies a large amount of parallel space at the lead-out ends, significantly increasing the difficulty of welding and insulation treatment at the bridging points. Furthermore, to accommodate different spans, various specifications of bridging copper busbars and coils need to be designed, resulting in an increase in coil types and structural complexity, which is detrimental to manufacturing and cost control.

[0004] The slot-bending bridging method involves bending the conductor at the slot to form a bridging arc for connection. This structure makes it difficult to arrange an effective bridging arc support structure at the bend, easily leading to stress concentration. Furthermore, under rated operating conditions, it is subjected to long-term fatigue alternating stress, which can easily exceed the fatigue strength limit of the coil material. In addition, the bending bridging method requires an additional increase in the axial length of the winding, resulting in increased copper consumption and a larger motor size, which does not conform to the trend of lightweight design.

[0005] In summary, existing technologies have the following prominent problems: for high-power motors, end-connection presents technological bottlenecks in terms of welding reliability and insulation protection; slot-bending bridging faces the contradiction of insufficient mechanical strength and increased material consumption. Existing rotor winding bridging methods cannot simultaneously meet the comprehensive requirements of high reliability, structural simplification, and cost optimization for high-power doubly-fed generators, necessitating an improved bridging structure to solve the aforementioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a rotor assembly and a wind turbine generator, which aims to solve the problem that the existing bridging method of rotor windings is difficult to simultaneously meet the comprehensive requirements of high reliability, structural simplification and cost optimization for high-power doubly-fed generators.

[0007] To address the aforementioned technical problems, embodiments of the present invention provide a rotor assembly, comprising: Shaft; A rotor core is disposed on the rotating shaft, and the rotor core is provided with a plurality of rotor slots arranged circumferentially along the rotating shaft; The rotor winding includes a plurality of winding coils, each winding coil being partially embedded in the rotor slot. The plurality of winding coils include two first winding coils arranged at intervals in the circumferential direction of the rotating shaft. The two first winding coils are respectively provided with two bridging portions located on the same side of the rotor core in the axial direction of the rotating shaft. Two electrically connected coil connectors are respectively disposed on the two bridging portions to bridge the two first winding coils through the two coil connectors.

[0008] To achieve the above objectives, the present invention also provides a wind turbine generator, including the rotor assembly described above.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The rotor assembly of the present invention adopts a slot bridging structure. By setting two coil connectors that are electrically connected to each other at the bridging part of the two first winding coils, the slot bridging of the two first winding coils is realized. This slot bridging structure can not only ensure the reliability of the connection, but also simplify the structure and reduce the manufacturing cost. Attached Figure Description

[0010] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0011] Figure 1 This is one of the cross-sectional views of the rotor assembly in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 Schematic diagram of the structure at the intermediate coil connector; Figure 4 for Figure 1 Schematic diagram of the middle support ring; Figure 5 for Figure 1 A schematic diagram of the structure at the first winding coil; Figure 6 for Figure 5 A magnified view of a section at point B in the middle.

[0012] Explanation of reference numerals in the accompanying drawings of this invention: Rotor assembly 100, shaft 1, rotor core 2, rotor slot 21, rotor winding 3, winding coil 31, first winding coil 31a, bridging part 311a, limiting surface 312a, second winding coil 31b, lead-out part 311b, first bending section 312b, second bending section 313b, third bending section 314b, third winding coil 31c, coil connector 4, slot 41, first connecting part 42, second connecting part 43, clearance surface 44, bridging connector 5, support ring 6, inner ring 61, outer ring 62.

[0013] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0016] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0017] This invention provides a rotor assembly that can be used in wind turbines such as doubly-fed generators. Figures 1 to 6 A preferred embodiment of the rotor assembly provided by the present invention is shown.

[0018] Please see Figures 1 to 6In some embodiments, the rotor assembly 100 includes a rotating shaft 1, a rotor core 2, a rotor winding 3, and coil connectors 4. The rotor core 2 is disposed on the rotating shaft 1, and the rotor core 2 is provided with a plurality of rotor slots 21 arranged circumferentially along the rotating shaft 1. The rotor winding 3 includes a plurality of winding coils 31, each winding coil 31 being partially embedded in the rotor slot 21. The plurality of winding coils 31 include two first winding coils 31a arranged at intervals circumferentially on the rotating shaft 1. The two first winding coils 31a are respectively provided with two bridging portions 311a located on the same side of the rotor core 2 in the axial direction of the rotating shaft 1. Two electrically connected coil connectors 4 are respectively disposed on the two bridging portions 311a to bridging the two first winding coils 31a through the two coil connectors 4.

[0019] Specifically, the rotor assembly 100 can be used in doubly-fed generators such as four-pole doubly-fed generators or six-pole doubly-fed generators. Optionally, please refer to [link to relevant documentation]. Figures 1 to 6 In some embodiments, the rotor assembly 100 is used in a four-pole doubly-fed generator. The following description will take the use of the rotor assembly 100 in a four-pole doubly-fed generator as an example.

[0020] The rotor assembly 100 includes a shaft 1, a rotor core 2, a rotor winding 3, and coil connectors 4. The two ends of the shaft 1 in the axial direction are the driving end and the non-driving end, respectively. The driving end of the shaft 1 is usually connected to the wind turbine drive to realize the conversion of wind energy → mechanical energy → electrical energy, while the non-driving end of the shaft 1 is usually equipped with a slip ring assembly. Hereinafter, the axial direction of the shaft 1 is defined as front-rear, the driving end of the shaft 1 is the front end of the shaft 1, and the non-driving end of the shaft 1 is the rear end of the shaft 1.

[0021] The rotor core 2 is fixedly fitted into the middle of the rotating shaft 1. The rotor core 2 can be integrally formed with the rotating shaft 1; the rotor core 2 can also be fixedly set in the middle of the rotating shaft 1 by means of interference fit or other methods. Multiple rotor slots 21 are arranged on the outer peripheral side of the rotor core 2 at intervals along the circumference of the rotating shaft 1. Each rotor slot 21 penetrates the rotor core 2 from front to back upward, so as to form a front exit slot and a rear exit slot on the front end face and the rear end face of the rotor core 2, respectively.

[0022] The rotor winding 3 includes multiple winding coils 31. The specific material and shape of the winding coils 31 can be set according to the actual situation. For example, please refer to [link to relevant documentation]. Figures 1 to 6In some embodiments, the winding coil 31 is a copper busbar, and the following description will use the example of the winding coil 31 being a copper busbar. A portion of each winding coil 31 is embedded in a rotor slot 21, and each rotor slot 21 can contain one, two, three, four, five, six, or more winding coils 31. The middle portion of each winding coil 31 is embedded in the rotor slot 21, the front end of each winding coil 31 is located outside the rotor slot 21 and on the front side of the rotor core 2, and the rear end of each winding coil 31 is located outside the rotor slot 21 and on the rear side of the rotor core 2.

[0023] The plurality of winding coils 31 includes two first winding coils 31a, which are spaced apart circumferentially on the rotating shaft 1. Each first winding coil 31a has a bridging portion 311a at its front or rear end. The following description uses the example of two first winding coils 31a having two bridging portions 311a at their rear ends. The two first winding coils 31a are two winding coils 31 of different polarities but belonging to the same phase. The two first winding coils 31a are electrically connected by bridging, and the two bridging portions 311a are the bridging positions of the two first winding coils 31a, respectively. The specific shape and style of the bridging portion 311a can be set according to the actual situation; optionally, please refer to [reference needed]. Figures 1 to 6 In some embodiments, the bridging portion 311a extends along the axial direction of the rotating shaft 1 and extends in the front-to-back direction. The bridging portion 311a (i.e., the bridging position of the first winding coil 31a) does not need to be bent, which can avoid the problem of stress concentration at the bridging position of the first winding coil 31a. The following will describe the bridging portion 311a extending along the axial direction of the rotating shaft 1 as an example.

[0024] Two coil connectors 4 are respectively disposed on two bridging portions 311a, and the two coil connectors 4 are in conductive contact with the two bridging portions 311a respectively, so as to realize that the two coil connectors 4 are electrically connected to the two first winding coils 31a respectively. The two coil connectors 4 are electrically connected, thus bridging the two first winding coils 31a. The coil connectors 4 are located on the rear side of the rotor core 2, and the coil connectors 4 are usually arranged close to the rotor core 2 in the axial direction of the rotating shaft 1, that is, the coil connectors 4 are close to the rear slot opening of the rotor slot 21. In this way, the rotor assembly 100 adopts a slot bridging structure, and the two first winding coils 31a are bridging at the rear slot opening of the rotor slot 21, without occupying the parallel space at the lead end of the rotor winding 3. The number of end parallels is consistent with the number of winding coils 31, and the parallels are evenly arranged along the circumference of the rotor winding 3, which can effectively reduce the variety of coil specifications and reduce the difficulty of production and manufacturing.

[0025] The material of the coil connector 4 is usually the same as that of the winding coil 31. For example, the material of the coil connector 4 can be copper or a copper alloy. The coil connector 4 is fixedly disposed on the bridging portion 311a of the first winding coil 31a. The specific fixing method between the coil connector 4 and the first winding coil 31a can be set according to the actual situation. For example, the coil connector 4 and the first winding coil 31a can be fixed by welding or riveting. Optionally, please refer to... Figures 1 to 6 In some embodiments, two coil connectors 4 are respectively welded to two bridging portions 311a. The coil connectors 4 are fixed to the bridging portions 311a of the first winding coil 31a by welding. This method of fixing the coil connectors 4 to the first winding coil 31a is not only relatively simple and firm, but also has a low contact resistance between the coil connectors 4 and the first winding coil 31a. The following will be an example of two coil connectors 4 being respectively welded to two bridging portions 311a.

[0026] The specific electrical connection method between the two coil connectors 4 can be set according to the actual situation. For example, the two coil connectors 4 can be in direct conductive contact; the two coil connectors 4 can also be electrically connected through conductive parts, with both ends of the conductive parts making conductive contact with the two coil connectors 4 respectively. Optionally, please refer to... Figures 1 to 6 In some embodiments, two coil connectors 4 are spaced apart in the circumferential direction of the rotating shaft 1, and a bridging connector 5 is provided between the two coil connectors 4 to electrically connect them. Thus, the two first winding coils 31a are bridging each other through the two coil connectors 4 and the bridging connector 5. The following description will use the example of a bridging connector 5 between the two coil connectors 4 as an example.

[0027] The specific material and shape of the bridging connector 5 can be set according to the actual situation. For example, the material of the winding coil 31 can be copper or copper alloy, and the shape of the winding coil 31 can be arc-shaped or straight. Optionally, please refer to Figures 1 to 6 In some embodiments, the bridging connector 5 is arranged in an arc shape extending circumferentially along the shaft 1. The following description uses an arc-shaped copper busbar for the winding coil 31 as an example. The specific fixing method between the coil connector 4 and the bridging connector 5 can be set according to actual conditions. For example, the coil connector 4 and the bridging connector 5 can be fixed by welding or riveting. Optionally, please refer to... Figures 1 to 6In some embodiments, the two ends of the bridging connector 5 are respectively welded to the two coil connectors 4. The bridging connector 5 is fixed to the two coil connectors 4 by welding. This method of fixing the coil connectors 4 and the bridging connector 5 is not only relatively simple and firm, but also has a low contact resistance between the coil connectors 4 and the bridging connector 5. The following will take the example of the two ends of the bridging connector 5 being respectively welded to the two coil connectors 4 as an example.

[0028] The bridging part 311a, the coil connector 4, and the bridging connector 5 form the slot bridging structure of the rotor assembly 100. All welding and insulation wrapping processes of the slot bridging structure of the rotor assembly 100 are completed before winding, effectively ensuring the welding and insulation quality, thereby improving the performance and reliability of the wind turbine. At the same time, the bridging position structure of the rotor assembly 100 is compact, which not only reduces the axial length of the rotor winding 3 but also reduces the amount of copper material used, achieving the dual goals of cost reduction and weight reduction.

[0029] The rotor assembly 100 of the present invention adopts a slot bridging structure. By setting two coil connectors 4 that are electrically connected to each other in the bridging part 311a of the two first winding coils 31a, the slot bridging of the two first winding coils 31a is realized. This slot bridging structure can not only ensure the reliability of the connection, but also simplify the structure and reduce the manufacturing cost.

[0030] The specific shape and style of the coil connector 4 can be set according to the actual situation. For example, the coil connector 4 can be L-shaped, C-shaped, straight, or other shapes. Optionally, please refer to Figures 1 to 6 In some embodiments, the coil connector 4 includes a first connecting portion 42 and a second connecting portion 43. The first connecting portion 42 extends in a direction perpendicular to the axis of the rotating shaft 1, and one end of the first connecting portion 42 away from the axis of the rotating shaft 1 is disposed on the bridging portion 311a. The second connecting portion 43 is formed by bending and extending from one end of the first connecting portion 42 near the axis of the rotating shaft 1 in a direction away from the rotor core 2. The bridging connector 5 is disposed between the second connecting portions 43 of the two coil connectors 4, and the bridging connector 5 is located on the side of the second connecting portion 43 away from the axis of the rotating shaft 1.

[0031] Specifically, the first connecting portion 42 extends radially along the rotating shaft 1, and has a proximal end near the axis of rotation 1 and a distal end away from the axis of rotation 1. The distal end of the first connecting portion 42 is welded and fixed to the bridging portion 311a. The second connecting portion 43 extends longitudinally, and its front end is connected to the proximal end of the first connecting portion 42. An arc-shaped transition structure is typically provided between the front end of the second connecting portion 43 and the proximal end of the first connecting portion 42. The rear end of the second connecting portion 43 is welded and fixed to the bridging connector 5. The vertically connected first connecting portion 42 and second connecting portion 43 form an L-shaped coil connector 4, which has the advantages of simple structure and ease of processing. The bridging connector 5 can be located on the side of the second connecting portion 43 near the axis of rotation 1, or it can be located on the side of the second connecting portion 43 away from the axis of rotation 1. The following description will take the example of a coil connector 4 including a first connecting part 42 and a second connecting part 43, with a bridging connector 5 disposed on the side of the second connecting part 43 of the two coil connectors 4 away from the axis of rotation 1.

[0032] Optionally, please refer to Figures 1 to 6 In some embodiments, the surface of the coil connector 4 near the rotor core 2 is provided with a slot 41 that engages with the bridging portion 311a.

[0033] Specifically, a slot 41 is provided on the rear surface of the first connecting part 42, and the shape of the slot 41 is usually adapted to the shape of the bridging part 311a. The bridging part 311a of the first winding coil 31a is inserted into the slot 41, and the welding section between the bridging part 311a and the coil connector 4 is U-shaped. This not only realizes the installation and positioning between the first winding coil 31a and the coil connector 4, but also increases the welding area between the first winding coil 31a and the coil connector 4, thereby improving the conductivity of the welding part between the first winding coil 31a and the coil connector 4, reducing the contact resistance, and significantly reducing the heat generated during operation.

[0034] Similarly, the two ends of the bridging connector 5 are respectively lapped and welded to the second connecting parts 43 of the two coil connectors 4 in a planar manner. This increases the welding area between the bridging connector 5 and the coil connector 4, thereby improving the conductivity of the welding part between the bridging connector 5 and the coil connector 4, reducing the contact resistance, and significantly reducing the heat generated during operation.

[0035] The slot 41 may penetrate the surface of the coil connector 4 away from the axis of rotation of the shaft 1; alternatively, the slot 41 may not penetrate the surface of the coil connector 4 away from the axis of rotation of the shaft 1. Alternatively, please refer to... Figures 1 to 6 In some embodiments, the slot 41 extends through the surface of the coil connector 4 away from the axis of rotation 1.

[0036] Specifically, the slot 41 extends through the far end face of the first connecting part 42, so that the bridging part 311a of the first winding coil 31a can be inserted into the slot 41 from the front side of the coil connector 4, and the bridging part 311a of the first winding coil 31a can also be inserted into the slot 41 from the far side of the coil connector 4 (i.e. the side away from the axis of rotation 1), thereby making the installation method between the first winding coil 31a and the coil connector 4 more flexible.

[0037] Similarly, slot 41 may penetrate the surface of coil connector 4 away from rotor core 2; slot 41 may also not penetrate the surface of coil connector 4 away from rotor core 2. Optionally, please refer to Figures 1 to 6 In some embodiments, the slot 41 extends through the surface of the coil connector 4 away from the rotor core 2.

[0038] Specifically, the slot 41 penetrates the rear surface of the first connecting part 42, that is, the slot 41 penetrates the first connecting part 42 from front to back. In this way, the rear end face of the bridging part 311a can be located inside the slot 41, and the rear end face of the bridging part 311a can also be located outside the slot 41 and on the rear side of the first connecting part 42.

[0039] Optionally, please refer to Figures 1 to 6 In some embodiments, the bridging portion 311a is provided with a limiting surface 312a facing the coil connector 4.

[0040] Specifically, the bridging portion 311a is provided with a rearward limiting surface 312a. The limiting surface 312a of each first winding coil 31a abuts against the front side of the first connecting portion 42 of the corresponding coil connector 4. In this way, the abutting cooperation between the limiting surface 312a and the first connecting portion 42 can realize the installation limitation of the first winding coil 31a and the coil connector 4 in the front-back upward direction.

[0041] Optionally, please refer to Figures 1 to 6 In some embodiments, a support ring 6 is provided on the rotating shaft 1, and a bridging connector 5 is provided on the support ring 6.

[0042] Specifically, the support ring 6 can be fixedly fitted onto the rotating shaft 1 by means of interference fit or other methods, and the bridging connector 5 is designed as an arc-shaped structure concentric with the support ring 6. In this way, the support ring 6 and the bridging connector 5 can jointly resist the deformation caused by centrifugal force, significantly reducing stress concentration at the bridging position of the rotor assembly 100, thereby improving the reliability of the bridging position of the rotor assembly 100 against fatigue fracture. The specific shape and style of the support ring 6 can be set according to actual conditions; for example, please refer to... Figures 1 to 6In some embodiments, the support ring 6 includes an inner ring 61 and an outer ring 62. The inner ring 61 is fitted onto the rotating shaft 1, and the bridging connector 5 is disposed on the outer peripheral side or the inner peripheral side of the outer ring 62. The following will be an example of the support ring 6 including an inner ring 61 and an outer ring 62, with the bridging connector 5 disposed on the inner peripheral side of the outer ring 62.

[0043] Optionally, please refer to Figures 1 to 6 In some embodiments, an insulating structural layer (not shown in the figure) is provided between the support ring 6 and the bridging connector 5.

[0044] Specifically, the radial gap between the bridging connector 5 and the outer ring 62 is filled with insulating materials such as felt or glass felt to form an insulating structure layer between the support ring 6 and the bridging connector 5. The insulating structure layer is spaced between the support ring 6 and the bridging connector 5. The insulating structure layer can not only limit the movement of the bridging connector 5 in the radial direction, but also realize the insulation design between the support ring 6 and the bridging connector 5.

[0045] As described above, each rotor slot 21 can accommodate one, two, three, four, five, six, or more winding coils 31. Alternatively, please refer to... Figures 1 to 6 In some embodiments, the plurality of winding coils 31 include two second winding coils 31b, which are respectively arranged in correspondence with two first winding coils 31a and two coil connectors 4. A portion of each second winding coil 31b and a portion of a corresponding first winding coil 31a are embedded in the same rotor slot 21. Each second winding coil 31b is located on one side of the corresponding first winding coil 31a in the circumferential direction of the rotating shaft 1. Each second winding coil 31b is provided with a portion located near the rotor core 2. The lead-out portion 311b on one side of the coil connector 4 includes a first bent section 312b, at least a portion of the first bent section 312b of each second winding coil 31b is circumferentially opposite to the bridging portion 311a of a corresponding first winding coil 31a on the rotating shaft 1; from the end of the first bent section 312b near the rotor core 2 to the end away from the rotor core 2, the first bent section 312b of each second winding coil 31b is bent and extended in a direction away from the corresponding first winding coil 31a.

[0046] Specifically, each rotor slot 21 is provided with at least two winding coils 31, and each first winding coil 31a and a corresponding second winding coil 31b are embedded in the same rotor slot 21. The rear end of the second winding coil 31b is provided with a lead-out portion 311b, and a portion of the lead-out portion 311b is bent away from the corresponding first winding coil 31a to form a first bent section 312b on the lead-out portion 311b. At least a portion of the first bent section 312b of each second winding coil 31b is circumferentially opposite to the bridging portion 311a of the corresponding first winding coil 31a on the rotating shaft 1, thereby forming a clearance space between the lead-out portion 311b of each second winding coil 31b and the bridging portion 311a of the corresponding first winding coil 31a, so that the lead-out portion 311b of each second winding coil 31b can avoid the mounting area of ​​the corresponding coil connector 4, leaving sufficient mounting space for the insulation wrapping of the coil connector 4.

[0047] The lead-out portion 311b of the second winding coil 31b has a bent structure near the corresponding coil connector 4. The bent structure includes at least a first bent segment 312b. The specific shape of the bent structure can be set according to the actual situation. For example, the bent structure can be arc-shaped, S-shaped, wavy, or other shapes. Optionally, please refer to Figures 1 to 6 In some embodiments, the lead-out portion 311b further includes a second bend segment 313b and a third bend segment 314b, the second bend segment 313b being disposed between the first bend segment 312b and the third bend segment 314b; the second bend segment 313b of each second winding coil 31b extends from the first bend segment 312b toward a direction closer to the corresponding first winding coil 31a; the third bend segment 314b of each second winding coil 31b extends from the second bend segment 313b toward a direction away from the corresponding first winding coil 31a; at least a portion of the second bend segment 313b and / or the third bend segment 314b of each second winding coil 31b is circumferentially opposite to a corresponding coil connector 4 on the rotating shaft 1.

[0048] Specifically, the bending structure on the lead-out portion 311b includes a first bending segment 312b, a second bending segment 313b, and a third bending segment 314b connected in sequence. An arc-shaped transition structure is usually provided between the first bending segment 312b and the second bending segment 313b, and between the second bending segment 313b and the third bending segment 314b, so that the bending structure on the lead-out portion 311b is S-shaped. The S-shaped bending structure can achieve a bending inner radius of at least twice the thickness of the winding coil 31, effectively ensuring the manufacturability of the bending process.

[0049] Optionally, please refer to Figures 1 to 6In some embodiments, each coil connector 4 has a clearance surface 44 on its surface near the corresponding second winding coil 31b; from one end of the coil connector 4 near the axis of rotation 1 to the end away from the axis of rotation 1, the clearance surface 44 of each coil connector 4 is arranged to gradually move away from the corresponding second winding coil 31b.

[0050] Specifically, the clearance surface 44 can be a sloped surface or an arc surface. By setting the clearance surface 44 on the side of the coil connector 4 close to the corresponding second winding coil 31b, the structural gap between the coil connector 4 and the corresponding second winding coil 31b can be increased, thereby effectively increasing the insulation wrapping space of the coil connector 4.

[0051] Optionally, please refer to Figures 1 to 6 In some embodiments, the plurality of winding coils 31 include two third winding coils 31c, which are respectively arranged in correspondence with two first winding coils 31a and two coil connectors 4. A portion of each third winding coil 31c and a portion of the corresponding first winding coil 31a are embedded in the same rotor slot 21. Each third winding coil 31c is located on the side of the corresponding first winding coil 31a away from the axis of rotation 1. Each coil connector 4 abuts against the side of the third winding coil 31c located outside the rotor slot 21 near the axis of rotation 1.

[0052] Specifically, each rotor slot 21 is provided with at least two winding coils 31, and each first winding coil 31a and a corresponding third winding coil 31c are embedded in the same rotor slot 21. The rear end of each third winding coil 31c is in contact with the distal end face of the first connecting part 42 of the corresponding coil connector 4, so that the coil connector 4 can support the corresponding third winding coil 31c.

[0053] The rotor assembly 100 has the following advantages: 1. The rotor assembly 100 has fewer coil specifications and is easier to manufacture; 2. The slot bridging structure of the rotor assembly 100 has a large welding area, good conductivity at the welding points, low contact resistance, and low heat generation during operation; 3. All welding and insulation wrapping processes of the slot bridging structure of the rotor assembly 100 are completed before winding, effectively ensuring the welding and insulation quality, thereby improving the performance and reliability of the wind turbine; 4. The mechanical stress at the bridging position of the rotor assembly 100 is low, and the reliability against fatigue fracture is high; 5. The bridging position of the rotor assembly 100 has a compact structure, which can reduce the amount of copper used.

[0054] The present invention also provides a wind turbine generator, which includes a rotor assembly. Since the rotor assembly adopts the technical solution of the above embodiments, it has the beneficial effects brought about by the technical solution of the above embodiments.

[0055] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A rotor assembly, characterized in that, include: Shaft; A rotor core is disposed on the rotating shaft, and the rotor core is provided with a plurality of rotor slots arranged circumferentially along the rotating shaft; The rotor winding includes a plurality of winding coils, each winding coil being partially embedded in the rotor slot. The plurality of winding coils include two first winding coils arranged at intervals in the circumferential direction of the rotating shaft. The two first winding coils are respectively provided with two bridging portions located on the same side of the rotor core in the axial direction of the rotating shaft. Two electrically connected coil connectors are respectively disposed on the two bridging portions to bridge the two first winding coils through the two coil connectors.

2. The rotor assembly according to claim 1, characterized in that, The surface of the coil connector near the rotor core is provided with a slot that engages with the bridging portion.

3. The rotor assembly according to claim 2, characterized in that, The slot penetrates the surface of the coil connector away from the axis of rotation; and / or, the slot penetrates the surface of the coil connector away from the rotor core.

4. The rotor assembly according to claim 1, characterized in that, The two coil connectors are spaced apart in the circumferential direction of the rotating shaft, and a bridging connector is provided between the two coil connectors to electrically connect the two coil connectors.

5. The rotor assembly according to claim 4, characterized in that, The coil connector includes: A first connecting portion extends in a direction perpendicular to the axis of the rotating shaft, and one end of the first connecting portion away from the axis of the rotating shaft is disposed on the bridging portion. The second connecting portion is formed by bending and extending from one end of the first connecting portion near the axis of rotation along a direction away from the rotor core. The bridging connector is disposed between the second connecting portions of the two coil connectors, and the bridging connector is located on the side of the second connecting portion away from the axis of rotation.

6. The rotor assembly according to claim 4, characterized in that, A support ring is provided on the rotating shaft, and the bridging connector is provided on the support ring; and / or, the bridging connector is provided in an arc shape extending circumferentially along the rotating shaft.

7. The rotor assembly according to claim 6, characterized in that, An insulating structural layer is provided between the support ring and the bridging connector.

8. The rotor assembly according to claim 1, characterized in that, The plurality of winding coils include two second winding coils, which are respectively arranged in a corresponding manner with two first winding coils and two coil connectors. A portion of each second winding coil and a portion of a corresponding first winding coil are embedded in the same rotor slot. Each second winding coil is located on one side of the corresponding first winding coil in the circumferential direction of the rotating shaft. Each second winding coil is provided with a lead-out portion located on the side of the rotor core near the coil connector. The lead-out portion includes a first bent section, at least a portion of the first bent section of each second winding coil is circumferentially opposite the bridging portion of a corresponding first winding coil on the rotating shaft; from one end of the first bent section near the rotor core to one end away from the rotor core, the first bent section of each second winding coil is bent and extends in a direction away from the corresponding first winding coil.

9. The rotor assembly according to claim 8, characterized in that, The lead-out portion further includes a second bending section and a third bending section, wherein the second bending section is disposed between the first bending section and the third bending section; The second bend segment of each second winding coil is formed by bending and extending from the first bend segment toward the direction of the corresponding first winding coil; the third bend segment of each second winding coil is formed by bending and extending from the second bend segment toward the direction of the corresponding first winding coil. At least a portion of the second bend and / or the third bend of each of the second winding coils is circumferentially opposite to a corresponding coil connector on the shaft.

10. The rotor assembly according to claim 8, characterized in that, Each of the coil connectors has a clearance surface on its surface near the corresponding second winding coil; from one end of the coil connector near the axis of rotation to the end away from the axis of rotation, the clearance surface of each coil connector is gradually moved away from the corresponding second winding coil.

11. The rotor assembly according to claim 1, characterized in that, The plurality of winding coils include two third winding coils, which are respectively arranged in correspondence with two first winding coils and two coil connectors. A portion of each third winding coil and a portion of a corresponding first winding coil are embedded in the same rotor slot. Each third winding coil is located on the side of the corresponding first winding coil away from the axis of rotation. Each coil connector abuts against the side of the third winding coil located outside the rotor slot near the axis of rotation.

12. The rotor assembly according to claim 1, characterized in that, The coil connector is positioned close to the rotor core along the axial direction of the rotating shaft; and / or, The two coil connectors are respectively welded to the two bridging portions; and / or, The bridging portion is provided to extend axially along the shaft; and / or, The bridging portion is provided with a limiting surface facing the coil connector.

13. A wind turbine generator, characterized in that, Includes the rotor assembly as described in any one of claims 1-12.

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