Method for fixing the outgoing line of a high-power wind turbine rotor winding

Abstract

The application discloses a fixing method of a high-power wind power generator rotor winding lead-out wire, solves the contradiction between the high-power motor rotor winding lead-out wire and the limited inner diameter of the motor shaft end hollow hole, changes the lead-out wire of the high-power double-fed asynchronous wind power generator rotor from the traditional cable to the copper bar, uses the copper bar with smaller section due to the larger conductive density of the copper bar, meets the requirement of large output current, solves the problem that the lead-out wire requires large diameter and the hollow shaft end is limited and cannot be increased in diameter, in the central hole copper bar lead-out wire mode of the application, the rotor winding lead-out wire and the lead-out wire copper bar in the central hole are connected through an L adapter, the lead-out wire copper bar in the central hole and the slip ring are connected through a slip ring connecting piece, and the special structure of the hole supporting column and the tail supporting block is adopted, so that the three-phase copper bar lead-out wire is fastened, the assembly is considered, and the reliable connection of the copper bar lead-out wire, the slip ring and the rotor lead-out wire is realized.

Description

Technical Field

[0001] This invention relates to a doubly-fed asynchronous wind turbine, and more particularly to a fixing structure and method for fixing the rotor winding leads of a high-power doubly-fed asynchronous wind turbine. Background Technology

[0002] After the rotor winding leads of a doubly-fed asynchronous wind turbine are led out, they need to be connected to the slip rings at the motor shaft end. Early designs typically used a shaft end surface lead structure, fixing the leads to the surface of the motor shaft end. However, this structure is prone to breakage at the bends and fillets of the lead connectors. To overcome this defect, a shaft end center hole lead structure was subsequently developed. This structure involves creating a hollow shaft end where the slip ring is mounted, and creating cable insertion holes on the shaft surface. The rotor winding leads are then passed through these holes into the hollow shaft end for lead-out. After the wire passes through the outer end of the hollow shaft, it is connected to the slip ring terminal. However, for the rotor of a high-power doubly-fed asynchronous wind turbine, due to its large rotor current, the cross-sectional area of ​​the lead wire needs to be increased. If the lead wire structure with the center hole at the shaft end is adopted, the diameter of the hollow hole at the motor shaft end needs to be increased to meet the space requirements for the three-phase lead wires to pass through. This inevitably leads to a corresponding increase in the outer diameter of the shaft end where the slip ring is installed. However, since the slip ring is installed on the shaft end of the non-driving end of the generator, the diameter of the shaft end where the slip ring is installed is constrained by the inner diameter of the bearing, resulting in a problem of limited inner diameter of the hollow hole at the motor shaft end. Summary of the Invention

[0003] This invention provides a method for fixing the rotor winding lead wire of a high-power wind turbine generator, which solves the contradiction between the rotor winding lead wire of a high-power motor and the limited inner diameter of the hollow hole at the motor shaft end, as well as the technical problem of how to reliably fix the lead wire.

[0004] The present invention solves the above technical problems through the following technical solutions: The overall concept of this invention is to replace the traditional cable with a copper busbar for the rotor lead wires of a high-power doubly-fed asynchronous wind turbine. Because copper busbars have a higher conductivity density, a smaller cross-section is sufficient to meet the requirements of a large output current, thus solving the problem that the hollow shaft end, due to its limited diameter, cannot increase the diameter of the lead wires required for a large diameter. In the center-hole copper busbar lead wire method of this invention, the rotor winding lead wires and the lead wire copper busbars in the center hole are connected using an L-connector. The lead wire copper busbars in the center hole are connected to the slip rings via slip ring connectors. A specially structured internal support column and tail support block are used to secure the three-phase copper busbar lead wires while also facilitating assembly, achieving a reliable connection between the copper busbar lead wires, the slip rings, and the rotor lead wires.

[0005] A fixing structure for the rotor winding lead wires of a high-power wind turbine generator includes a hollow shaft end on the non-drive end of the generator. A three-jaw connecting ring is fixedly sleeved on the left end of the hollow shaft end. A top-hat shaped encoder mounting frame is fixedly connected to the right end of the hollow shaft end. An encoder is connected to the outer end of the top-hat shaped encoder mounting frame. A copper busbar lead wire insertion hole is provided on the hollow shaft end to the right of the three-jaw connecting ring. A copper busbar lead wire is provided in the hollow shaft end. The left end of the copper busbar lead wire passes through the copper busbar lead wire insertion hole and is welded to the horizontal section of an L-shaped transition copper busbar. The vertical section of the L-shaped transition copper busbar... The copper busbar lead wire is fixedly connected to the connecting claw on the three-jaw connecting ring. The right end of the copper busbar lead wire passes through the right port of the hollow shaft end and is welded to the tail connecting copper busbar. A support and fixing post for the copper busbar lead wire is embedded in the center hole of the hollow shaft end. A copper busbar embedding groove is provided on the cylindrical side surface of the support and fixing post, and the copper busbar lead wire is embedded in the copper busbar embedding groove. A tail supporting cylindrical block is provided in the right port of the hollow shaft end. A copper busbar tail embedding groove and a glue-filling groove are respectively provided on the cylindrical side surface of the tail supporting cylindrical block. The tail end of the copper busbar lead wire is embedded in the copper busbar tail embedding groove.

[0006] On the outer surface of the cylinder supporting the fixed column, three parallel copper busbar embedding grooves are arranged at equal intervals and arcs; on the outer surface of the cylinder supporting the cylindrical block at the tail, three parallel copper busbar tail embedding grooves are arranged at equal intervals and arcs; on the outer surface of the cylinder between two adjacent copper busbar tail embedding grooves, there is a potting groove; the top hat-shaped encoder mounting frame is composed of a flange and a three-jaw clamping bar. Bolt holes are provided on the flange, the left end of the three-jaw clamping bar is fixed to the right side of the flange, and the encoder is clamped at the right end of the three-jaw clamping bar.

[0007] At the center of each of the left and right end faces of the supporting column, there are column connecting screw holes. Three through holes for column pins are evenly distributed on the concentric circles outside these screw holes. At the center of the left end face of the tail-supporting cylindrical block, there is a tail-block connecting screw hole. Three through holes for block pins are evenly distributed on the concentric circles outside these screw holes. A fixing bolt connects the column connecting screw hole and the tail-block connecting screw hole. A connecting pin passes between the column pin through hole and the block pin through hole. Insulating glue is injected into the center hole of the hollow shaft end. The insulating glue is injected into the gap in the center hole of the hollow shaft end through a glue-filling groove, firmly bonding the copper busbar lead wire to the hollow shaft end.

[0008] A method for fixing the rotor winding lead wires of a high-power wind turbine generator includes a hollow shaft end on the non-driving end of the generator, a rotor winding lead wire connection end, and a slip ring. A three-jaw connecting ring is fixedly sleeved on the left end of the hollow shaft end, and a top-hat-shaped encoder mounting frame is fixedly connected to the right end of the hollow shaft end. A copper busbar lead wire insertion hole is provided on the hollow shaft end to the right of the three-jaw connecting ring. The method is characterized by the following steps: The first step is to fabricate the copper busbar lead-out wire, the L-shaped adapter copper busbar, and the tail connecting copper busbar separately; The second step is to make a support and fixing column that is embedded in the center hole according to the center hole diameter of the hollow shaft end, and to set three parallel copper busbar embedding grooves at equal intervals on the outer side of the cylindrical support and fixing column. The third step is to make a tail support cylindrical block that is embedded in the right port of the hollow shaft end according to the center hole diameter of the hollow shaft end. On the outer surface of the cylinder of the tail support cylindrical block, three parallel copper bus tail embedding grooves are set at equal intervals. On the outer surface of the cylinder between two adjacent copper bus tail embedding grooves, glue potting grooves are set. The fourth step is to embed the copper busbar lead wire into the copper busbar embedding groove on the outer surface of the cylindrical support column, and to embed the support column with the copper busbar lead wire into the center hole of the hollow shaft end, so that the left end of the copper busbar lead wire passes through the copper busbar lead wire insertion hole. Step 5: Insert the tail support cylindrical block into the right port of the hollow shaft end, and let the right end of the copper busbar lead wire pass through the groove of the copper busbar tail and out into the encoder mounting frame. Step 6: Weld one end of the L-shaped adapter copper busbar to the left end of the copper busbar lead wire that passes through the copper busbar lead wire insertion hole; weld the tail end of the copper busbar to the right end of the copper busbar lead wire. Step 7: First, fix the other end of the L-shaped adapter copper busbar to the connecting claw of the three-jaw connecting ring, and then connect it to the rotor winding lead wire connection end; connect the other end of the tail connecting copper busbar to the slip ring.

[0009] This invention satisfies the requirement for high current output of the lead wires of a high-power doubly-fed asynchronous wind turbine rotor without increasing the diameter of the non-drive end of the motor shaft. By setting a fixing post and fixing block for the copper busbar in the hollow shaft end, the integrated fixing of the lead wire copper busbar and the motor shaft is achieved. The fixing method of this invention is simple to operate, ingenious in structure, and has certain economic promotion value. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2This is a diagram showing the fit between the copper busbar lead-out wire 8 in the center hole of the shaft end and its support mechanism; Figure 3 This is a diagram showing the connection relationship between the copper busbar lead-out line 8, the three-jaw connecting ring 2 on the inner end, and the encoder mounting frame 6. Figure 4 This is a schematic diagram of the structure of the support and fixing column 9 for the copper busbar lead wire of the present invention; Figure 5 This is a schematic diagram of the support and fixing column 9 of the present invention viewed from the right. Figure 6 This is a schematic diagram of the structure of the tail support cylindrical block 21 of the present invention; Figure 7 This is a diagram showing the connection relationship between the L-shaped adapter copper busbar 3, the copper busbar lead wire 8, and the tail connecting copper busbar 5 of the present invention. Figure 8 This is a schematic diagram of the structure of the three-claw connecting ring 2 of the present invention; Figure 9 This is a schematic diagram of the structure of the top hat-shaped encoder mounting frame 6 of the present invention; Figure 10 This is a diagram showing the relationship between the present invention, the rotor winding lead connection end 22, and the slip ring 23. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings: A fixing structure for the rotor winding lead wires of a high-power wind turbine generator includes a hollow shaft end 1 on the non-drive end of the generator. A three-jaw connecting ring 2 is fixedly sleeved on the left end of the hollow shaft end 1. A top-hat shaped encoder mounting frame 6 is fixedly connected to the right end of the hollow shaft end 1. An encoder 7 is connected to the outer end of the top-hat shaped encoder mounting frame 6. A copper busbar lead wire insertion hole 4 is provided on the hollow shaft end 1 to the right of the three-jaw connecting ring 2. Three copper busbar lead wires 8 are provided in the hollow shaft end 1. The copper busbar leads 8 are phases A, B, and C respectively. The left end of the copper busbar lead 8 passes through the copper busbar lead 4 and is welded to the horizontal section of the L-shaped transition copper busbar 3. The vertical section of the L-shaped transition copper busbar 3 is fixedly connected to the connecting claws 11 on the three-jaw connecting ring 2. A connecting claw 11 is set at 120-degree intervals on the outer circumference of the three-jaw connecting ring 2, used to connect and fix the copper busbar leads of phases A, B, and C respectively. The right end of the copper busbar lead 8 passes through the right side port of the hollow shaft end 1 and is welded to the tail connecting copper busbar 5. A support post 9 for a copper busbar lead wire is embedded in the central hole of the hollow shaft end 1. A copper busbar embedding groove 10 is provided on the cylindrical side surface of the support post 9. The copper busbar lead wire 8 is embedded in the copper busbar embedding groove 10. The diameter of the support post 9 is approximately equal to the inner diameter of the central hole of the hollow shaft end 1, ensuring that the support post 9, once embedded in the central hole of the hollow shaft end 1, can be tightly joined together, thus fixing the copper busbar lead wire 8. A tail support cylindrical block 21 is provided at the right end of the hollow shaft end 1. On the cylindrical side surface of the tail support cylindrical block 21, there are copper busbar tail embedding groove 15 and glue potting groove 18 respectively. The copper busbar tail embedding groove 15 is inverted T-shaped, so that the tail support cylindrical block 21 can fix the tail of the copper busbar lead wire 8 securely. The tail end of the copper busbar lead wire 8 is embedded in the copper busbar tail embedding groove 15. The glue potting groove 18 is provided so that after the copper busbar lead wire 8 is assembled into the center hole of the hollow shaft end 1, insulating glue is injected into the gap in the center hole, so that the copper busbar lead wire 8 and the hollow shaft end 1 are fixed into a whole.

[0012] On the outer surface of the cylinder supporting the fixed column 9, three parallel copper busbar embedding grooves 10 are provided at equal intervals and arcs; on the outer surface of the cylinder supporting the cylindrical block 21 at the tail, three parallel copper busbar tail embedding grooves 15 are provided at equal intervals and arcs; on the outer surface of the cylinder between two adjacent copper busbar tail embedding grooves 15, there is a potting groove 18; the top hat-shaped encoder mounting frame 6 is composed of a flange 19 and a three-jaw clamping bar 20. Bolt holes 12 are provided on the flange 19, and the encoder mounting frame 6 is fixedly connected to the right end of the hollow shaft end 1 through the bolt holes 12 provided on the flange 19; the left end of the three-jaw clamping bar 20 is fixed to the right side of the flange 19, and the encoder 7 is clamped at the right end of the three-jaw clamping bar 20.

[0013] At the center of both ends of the supporting column 9, there are column connecting screw holes 13. On the concentric circles outside the column connecting screw holes 13, there are three column pin through holes 14. At the center of the left end face of the tail supporting cylindrical block 21, there is a tail block connecting screw hole 16. On the concentric circles outside the tail block connecting screw hole 16, there are three block pin through holes 17. A fixing bolt is connected between the column connecting screw hole 13 and the tail block connecting screw hole 16. A connecting pin is inserted between the column pin through holes 14 and the block pin through holes 17. The setting of the connecting pin is to connect the tail supporting cylindrical block 21 and the supporting column 9 into a whole and to ensure that the position of the three copper busbar leads 8 in the center hole remains unchanged. Insulating glue is poured into the center hole of the hollow shaft end 1.

[0014] A method for fixing the rotor winding lead wires of a high-power wind turbine generator includes a hollow shaft end 1 on the non-driving end of the generator, a rotor winding lead wire connection end 22, and a slip ring 23. A three-jaw connecting ring 2 is fixedly sleeved on the left end of the hollow shaft end 1, and a top-hat-shaped encoder mounting frame 6 is fixedly connected to the right end of the hollow shaft end 1. A copper busbar lead wire insertion hole 4 is provided on the hollow shaft end 1 to the right of the three-jaw connecting ring 2. The method is characterized by the following steps: The first step is to fabricate the copper busbar lead-out wire 8, the L-shaped adapter copper busbar 3, and the tail connecting copper busbar 5 respectively; The second step is to make a support and fixing column 9 that is embedded in the center hole according to the center hole diameter of the hollow shaft end 1, and to set three parallel copper busbar embedding grooves 10 at equal intervals on the outer side of the cylindrical support and fixing column 9. The third step is to make a tail support cylindrical block 21 that is embedded in the right port of the hollow shaft end 1 according to the center hole diameter of the hollow shaft end 1. On the outer cylindrical surface of the tail support cylindrical block 21, three parallel copper bus tail embedding grooves 15 are set at equal intervals. On the outer cylindrical surface between two adjacent copper bus tail embedding grooves 15, glue potting grooves 18 are set. The fourth step is to embed the copper busbar lead wire 8 into the copper busbar embedding groove 10 on the outer vertical surface of the cylindrical support and fixing column 9, and to embed the support and fixing column 9 with the copper busbar lead wire 8 into the center hole of the hollow shaft end 1, so that the left end of the copper busbar lead wire 8 passes through the copper busbar lead wire insertion hole 4. Step 5: Insert the tail support cylindrical block 21 into the right port of the hollow shaft end 1, and let the right end of the copper busbar lead wire 8 pass through the copper busbar tail embedded groove 15 and then out into the encoder mounting frame 6. Step 6: Weld one end of the L-shaped adapter copper busbar 3 to the left end of the copper busbar lead wire 8 that passes through the copper busbar lead wire insertion hole 4; weld one end of the tail connecting copper busbar 5 to the right end of the copper busbar lead wire 8. Step 7: First, fix the other end of the L-shaped adapter copper busbar 3 onto the connecting claw 11 of the three-jaw connecting ring 2, and then connect it to the rotor winding lead wire connection end 22; connect the other end of the tail connecting copper busbar 5 to the slip ring 23.

[0015] At the center of both ends of the supporting column 9, there are column connecting screw holes 13. On the concentric circles outside the column connecting screw holes 13, there are three column pin through holes 14. At the center of the left end face of the tail supporting cylindrical block 21, there is a tail block connecting screw hole 16. On the concentric circles outside the tail block connecting screw hole 16, there are three block pin through holes 17. A fixing bolt is used to connect the column connecting screw holes 13 and the tail block connecting screw holes 16. A connecting pin is used between the column pin through holes 14 and the block pin through holes 17, so that the supporting column 9 and the tail supporting cylindrical block 21 are connected as one unit. This connection structure also achieves convenient and reliable assembly.

[0016] Insulating adhesive is injected into the center hole of the hollow shaft end 1. The insulating adhesive is injected into the gap in the center hole of the hollow shaft end 1 through the adhesive injection groove 18, which firmly bonds the copper busbar lead wire 8 to the hollow shaft end 1. After injecting the insulating adhesive, the motor is sent into the oven to bake, so that the insulating adhesive is firmly bonded to each component.

Claims

1. A method for fixing the rotor winding lead wire of a high-power wind turbine generator, comprising a hollow shaft end (1) on the non-driving end of the generator, a rotor winding lead wire connection end (22) and a slip ring (23), wherein a three-jaw connecting ring (2) is fixedly sleeved on the left end of the hollow shaft end (1), and a top-hat shaped encoder mounting frame (6) is fixedly connected on the right end of the hollow shaft end (1), and a copper busbar lead wire insertion hole (4) is provided on the hollow shaft end (1) to the right of the three-jaw connecting ring (2), characterized by the following steps: The first step is to fabricate the copper busbar lead-out wire (8), the L-shaped adapter copper busbar (3), and the tail connecting copper busbar (5) respectively. The second step is to make a support and fixing column (9) embedded in the center hole according to the center hole diameter of the hollow shaft end (1), and to set three parallel copper busbar embedding grooves (10) on the outer cylindrical surface of the support and fixing column (9) at equal intervals. Third step: Based on the center hole diameter of the hollow shaft end (1), make a tail support cylindrical block (21) to be embedded in the right port of the hollow shaft end (1), and set three parallel copper bus tail embedding grooves (15) at equal intervals on the outer cylindrical surface of the tail support cylindrical block (21), and set glue potting grooves (18) on the outer cylindrical surface between two adjacent copper bus tail embedding grooves (15). The fourth step is to embed the copper busbar lead wire (8) into the copper busbar embedding groove (10) on the outer side of the cylindrical support and fixing column (9), and to embed the support and fixing column (9) with the copper busbar lead wire (8) into the center hole of the hollow shaft end (1), so that the left end of the copper busbar lead wire (8) passes through the copper busbar lead wire insertion hole (4); Step 5: Insert the tail support cylindrical block (21) into the right port of the hollow shaft end (1), and let the right end of the copper busbar lead wire (8) pass through the copper busbar tail insertion groove (15) and then pass into the encoder mounting frame (6). Step 6: Weld one end of the L-shaped adapter copper busbar (3) to the left end of the copper busbar lead wire (8) that passes through the copper busbar lead wire insertion hole (4); weld one end of the tail connecting copper busbar (5) to the right end of the copper busbar lead wire (8); Step 7: First fix the other end of the L-shaped adapter copper busbar (3) onto the connecting claw (11) of the three-jaw connecting ring (2), and then connect it to the rotor winding lead wire connection end (22); connect the other end of the tail connecting copper busbar (5) to the slip ring (23).

2. The method for fixing the rotor winding lead wires of a high-power wind turbine generator according to claim 1, characterized in that, At the center of the left and right end faces of the support and fixing column (9), there are column connecting screw holes (13). On the concentric circle outside the column connecting screw holes (13), there are three column pin through holes (14). At the center of the left end face of the tail support cylindrical block (21), there is a tail block connecting screw hole (16). On the concentric circle outside the tail block connecting screw hole (16), there are three block pin through holes (17). A fixing bolt is connected between the column connecting screw hole (13) and the tail block connecting screw hole (16). A connecting pin is connected between the column pin through hole (14) and the block pin through hole (17), so that the support and fixing column (9) and the tail support cylindrical block (21) are connected as one unit.

3. A method for fixing the rotor winding lead wires of a high-power wind turbine generator according to claim 1 or 2, characterized in that, Insulating glue is injected into the center hole of the hollow shaft end (1). The insulating glue is injected into the gap in the center hole of the hollow shaft end (1) through the glue injection groove (18) to firmly bond the copper busbar lead wire (8) to the hollow shaft end (1).

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