High-power doubly-fed wind generator rotor wire outlet structure

Abstract

The invention discloses a high-power doubly-fed wind generator rotor wire outlet structure which comprises a rotor phase connecting wire, a flexible copper bar, an insulating fixing block, a copper bar protective sleeve and a copper bar cushion block, the rotor phase connecting wire adopts a hard copper bar L-shaped structure, one end of the rotor phase connecting wire is connected with a rotor coil, and the other end of the rotor phase connecting wire is connected with the flexible copper bar. The flexible copper bar adopts a multi-layer soft copper busbar structure, the surface of the copper busbar is wrapped with an insulating material and then embedded into the U-shaped copper bar protective sleeve, a copper busbar body is arranged in the rotating shaft, one end of the copper busbar penetrates out of an inclined hole of the rotating shaft to be welded to the other end of the phase connecting line, and the copper busbar and the rotor phase connecting line are fixed to the rotating shaft through an insulating fixing block. The inclined hole of the rotating shaft is blocked by felt and resin glue, a triangular copper bar cushion block is arranged in the rotating shaft, and three groups of copper busbars are arranged between the copper bar cushion block and the rotating shaft in a manner of forming 120-degree angles with one another. The flexible copper bar is used for replacing a silicone rubber cable, the copper bar is wedged in the shaft hole through the insulating fixing block, 90-degree bending of the joint of the copper bar and the slip ring can be achieved, the fixing block in the shaft hole can be detached, and maintenance and replacement are convenient.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine rotor technology, specifically relating to a high-power doubly-fed wind turbine rotor output structure. Background Technology

[0002] Currently, wind turbines are developing towards higher power, higher reliability, higher efficiency, and lower cost. Therefore, improving the performance reliability and maintainability of the generator structure is extremely important.

[0003] High-power doubly-fed generators (10MW and above) are the main type of onshore high-power wind turbine generators, and they are also gradually being applied to offshore wind power. Structural reliability is of paramount importance. As one of the key components of the doubly-fed generator, the reliability of the rotor is related to the reliability of the entire generator.

[0004] Existing cable lead-out structures are suitable for generators with low power and low rotor current. However, as generator power increases, the existing cable lead-out structures are no longer adequate for the needs of high-current generators, specifically due to the following drawbacks: 1) As the power of doubly fed motors increases and the outer diameter of the rotor core increases, when the rotor rotates at high speed, each component on the rotor, including coils and cables, will be subjected to a large centrifugal force and thrown out of the core, which may wear through the cables. 2) If the cable is not securely fixed, it will loosen during rotation, and then gradually break and burn out. 3) Traditional doubly fed generator rotor leads use cable lead structure. As the generator power continues to increase, the rotor current also increases, and the specifications of the rotor lead cable also increase. However, the cable needs to pass through the shaft hole and connect to the slip ring. The size of the shaft hole and the space at the slip ring exit are small, and the cable turning radius cannot meet the requirements, resulting in the risk that the cable cannot be turned and the cable will be damaged by friction with the shaft, causing the cable to burn out. 4) For high-power doubly-fed generators, copper busbars are usually used as the outgoing line structure. The copper busbars are sealed in the shaft hole with potting compound. This structure has poor manufacturability. The rotor needs to be erected and the insulating potting compound needs to be injected into the shaft hole several times. It also has poor maintainability. If there is a problem with the outgoing line, the potting compound in the shaft hole and the copper busbar need to be destroyed with a drill bit before a new copper busbar can be replaced. Summary of the Invention

[0005] To address the aforementioned issues, this invention discloses a high-power doubly-fed wind turbine rotor output structure. A flexible copper busbar replaces the silicone rubber cable, and an insulating fixing block weds the copper busbar tightly within the shaft hole. This structure allows for a 90° bend at the connection between the copper busbar and the slip ring, solving the problem of limited space and difficulty in outputting the cable. The fixing block within the shaft hole can be removed for easy maintenance and replacement.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A high-power doubly-fed wind turbine rotor output structure includes a rotor connecting wire, a flexible copper busbar, an insulating fixing block, a copper busbar protective sleeve, and a copper busbar pad. The rotor connecting wire adopts a rigid copper busbar L-shaped structure. One end of the rotor connecting wire is connected to the rotor coil through an H-shaped adapter block and then welded together. The flexible copper busbar adopts a multi-layer soft copper busbar structure. The surface of the copper busbar is wrapped with insulating material. After the wrapping is completed, the copper busbar is embedded in a U-shaped copper busbar protective sleeve. The main body of the copper busbar is set inside the shaft. One end of the copper busbar passes through the oblique hole of the shaft and is welded to the other end of the connecting wire. The connection between the copper busbar and the rotor connecting wire is wrapped with insulating material and fixed to the shaft with an insulating fixing block. The other end is bent 90° and connected to the conductor rod of the slip ring. The oblique hole of the shaft is sealed with felt and resin glue. A triangular copper busbar pad is set inside the shaft. Three sets of copper busbars are set at 120° to each other between the copper busbar pad and the shaft.

[0007] As a supplement to the present invention, the insulating fixing block is a square block composed of two U-shaped blocks joined together by bolts, and the connection point between the copper busbar and the rotor is set in the middle gap.

[0008] As a supplement to the present invention, the bonding material is mica or polyester tape.

[0009] As a supplement to the present invention, the flexible copper busbar is a laminated insulating soft copper busbar, which is composed of 10-20 copper sheets, each copper sheet having a thickness of 0.2-0.3 mm.

[0010] As a supplement to the present invention, the copper busbar protective sleeve is made of rubber.

[0011] As a supplement to the present invention, an adjustment shim is provided between the flexible copper busbar and the copper busbar pad, wherein the adjustment shim is a glass cloth laminate of different thicknesses.

[0012] The beneficial effects of this invention are as follows: 1) It adopts a multi-layer soft busbar structure with a large current carrying capacity, which can achieve 90° turns, overcome the problem of difficult outgoing lines in small spaces, and is suitable for use in generators with large current and compact space; 2) The outer insulation has a high heat resistance rating, making it suitable for doubly-fed wind turbines of various power ratings; 3) It offers a high degree of design freedom and can meet the needs of various working environments; 4) The process is simple, easy to disassemble and assemble without damage, and highly maintainable; 5) Replace cables with multi-layer flexible busbars to reduce heat generation, prevent deformation, and ensure stable operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] Figure 2 for Figure 1 AA cross-section view.

[0015] Figure 3 This is a schematic diagram of the insulating fixing block described in this invention.

[0016] List of identifiers in attached diagrams: 1. Rotor coil; 2. Connecting wires; 3. Insulating fixing block; 4. Flexible copper busbar; 5. Felt and resin adhesive; 6. Copper busbar protective sleeve; 7. Adjusting shim; 8. Copper busbar pad; 9. Shaft oblique hole; 10. Shaft. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] As shown in the figure, the rotor output structure of a high-power doubly-fed wind turbine according to the present invention includes a rotor connecting wire 2, an insulating fixing block 3, a flexible copper busbar 4, a copper busbar protective sleeve 6, and a copper busbar pad 8. The rotor connecting wire 2 adopts a rigid copper busbar L-shaped structure. One end of the rotor connecting wire 2 is connected to the rotor coil 1 through an H-shaped adapter block and then welded together. The flexible copper busbar 4 adopts a multi-layer soft copper busbar structure. The surface of the copper busbar is wrapped with insulating material. After the wrapping is completed, the copper busbar is embedded in the U-shaped copper busbar protective sleeve 6. The main body of the copper busbar is set in the rotating shaft 10. One end of the copper busbar passes through the oblique hole 9 of the rotating shaft and is welded to the other end of the connecting wire. The connection between the copper busbar and the rotor connecting wire 2 is wrapped with insulating material and fixed to the rotating shaft 10 with an insulating fixing block 3. The other end is bent 90° and connected to the conductor rod of the slip ring. The oblique hole 9 of the rotating shaft is sealed with felt and resin glue 5. A triangular copper busbar pad 8 is set in the rotating shaft 10. Three sets of copper busbars are set at 120° to each other between the copper busbar pad 8 and the rotating shaft 10.

[0019] The present invention discloses a high-power doubly-fed wind turbine rotor output structure, wherein the conductor bus is made of flexible copper bus, which has a large current carrying capacity and can be bent and twisted indefinitely, making it suitable for use in generators with large current and compact space.

[0020] like Figure 3 As shown, the insulating fixing block 3 of the present invention is a square block composed of two U-shaped blocks joined together by bolts. The connection between the copper busbar and the connected wiring is set in the middle gap, which is reliable. The insulating fixing block 3 can be disassembled without damage, which is convenient for maintenance.

[0021] The bonding material described in this invention is mica or polyester tape, which are commonly used materials and easy to purchase.

[0022] The flexible copper busbar 4 described in this invention is a laminated insulating soft copper busbar. The flexible copper busbar is composed of 10-20 copper sheets, each of which is 0.2-0.3 mm thick. The entire flexible copper busbar 4 has the characteristics of easy processing and forming and unlimited bending and twisting, while also having high current carrying capacity. It can reduce the amount of conductor material used, reduce weight, and save layout space.

[0023] The copper busbar protective sleeve 6 of the present invention can fix the flexible copper busbar 4 in the shaft hole and can also be flexibly removed, making it easy to disassemble and replace the flexible copper busbar 4. The copper busbar protective sleeve 6 is made of rubber, which can provide insulation and compressibility, and fits tightly against the shaft hole wall.

[0024] To prevent the flexible copper busbar 4 from loosening within the rotating shaft 10, the present invention provides an adjusting shim 7 between the flexible copper busbar 4 and the copper busbar pad 8. The adjusting shim is a glass cloth laminate of different thicknesses. The number of shims can be increased or decreased according to the actual situation of the generator to fix the copper busbar within the rotating shaft and prevent it from loosening.

[0025] It should be noted that the above content merely illustrates the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, various improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A rotor output structure for a high-power doubly-fed wind turbine generator, characterized in that: The components include rotor connecting wire (2), insulating fixing block (3), flexible copper busbar (4), copper busbar protective sleeve (6), and copper busbar pad (8). The rotor connecting wire (2) adopts a hard copper busbar L-shaped structure. One end of the rotor connecting wire (2) is connected to the rotor coil (1) through an H-shaped adapter block and then welded together. The flexible copper busbar (4) adopts a multi-layer soft copper busbar structure. The surface of the copper busbar is wrapped with insulating material. After the wrapping is completed, the copper busbar is embedded in the U-shaped copper busbar protective sleeve (6). The main body of the copper busbar is set on the rotating shaft ( Inside 10), one end of the copper busbar passes through the inclined hole (9) of the rotating shaft and is welded to the other end of the connecting wire. The connection point of the copper busbar and the rotor connecting wire (2) is wrapped with insulating material and fixed on the rotating shaft (10) with an insulating fixing block (3). The other end is bent 90° and connected to the conductor rod of the collector ring. The inclined hole (9) of the rotating shaft is sealed with felt and resin glue (5). A triangular copper busbar pad (8) is set inside the rotating shaft (10). Three sets of copper busbars are set at 120° to each other between the copper busbar pad (8) and the rotating shaft (10).

2. The rotor output structure of a high-power doubly-fed wind turbine generator according to claim 1, characterized in that: The insulating fixing block (3) is a square block composed of two U-shaped blocks joined together by bolts. The connection point of the copper busbar and the rotor wiring (2) is set in the middle gap.

3. The rotor output structure of a high-power doubly-fed wind turbine generator according to claim 1, characterized in that: The bonding material is mica or polyester tape.

4. The rotor output structure of a high-power doubly-fed wind turbine generator according to claim 1, characterized in that: The flexible copper busbar (4) is a laminated insulating soft copper busbar. The flexible copper busbar (4) is composed of 10-20 copper sheets, and the thickness of each copper sheet is 0.2-0.3mm.

5. The rotor output structure of a high-power doubly-fed wind turbine generator according to claim 1, characterized in that: The copper busbar protective sleeve (6) is made of rubber.

6. The rotor output structure of a high-power doubly-fed wind turbine generator according to claim 1, characterized in that: An adjustment shim (7) is provided between the flexible copper busbar (4) and the copper busbar pad (8), and the adjustment shim (7) is a glass cloth laminate of different thicknesses.

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