An installation method and fixing structure for improving the reliability of a pumped storage power generation motor rotor lead

Abstract

The application provides a kind of installation method and fixed structure for improving the reliability of pumped storage generator motor rotor lead, belongs to the field of pumped storage generator motor, comprising: the first lead near the yoke side is arranged in Z shape, and when installing, the end near the inner diameter side of the rotor is connected with the second clamp assembly;The end of the first lead near the outer diameter side of the rotor is fixed on the clamp pad iron of the fan on the yoke;Adjust the middle section of the first lead, so that it is pre-deformed in the direction opposite to the stress when the unit is running, and the pre-deformation amount is equal to the deformation amount of the first lead when the unit is running at rated speed;The pad iron of the second clamp is welded and fixed with the support plate on the rotor support.The fixed structure is obtained by the above installation method.The application can adapt to the deformation difference between the yoke and the rotor support during operation, reduce the stress of the rotor lead and its fixed accessories across the transition position, and improve the reliability of the unit.

Description

Technical Field

[0001] This invention relates to the field of pumped storage power generation motors, and specifically to an installation method and fixing structure for improving the reliability of the rotor leads of a pumped storage power generation motor. Background Technology

[0002] Pumped-storage generators are a special type of hydroelectric generator, characterized by bidirectional rotation, frequent start-stop cycles, and large capacity per pole. Therefore, the design of their rotor components is significantly more challenging than that of conventional generators. Besides meeting standard rigidity requirements, fatigue design of each component is particularly critical. The rotor mainly consists of core components such as magnetic poles, a magnetic yoke, a rotor support, and rotor winding leads. The magnetic poles are fixed to the outer circumference of the yoke, which is then fixed to the outer diameter of the rotor support via radial and tangential keying. When direct current is applied to the magnetic pole coils, an excitation magnetic field is generated, forming a closed-loop magnetic circuit through the magnetic pole core, stator core, and air gap. This closed-loop magnetic circuit, created by the rotor rotation, "cuts" the stator windings, thus converting mechanical energy into electrical energy. To supply direct current to the magnetic pole coil, rotor winding leads are required, specifically including inter-pole connecting wires and rotor leads: inter-pole connecting wires are used to realize the electrical connection between the magnetic pole lead heads; one end of the rotor lead is fixed to the magnetic pole lead head, the other end is fixed to the slip ring, and the middle part is fixed to components such as the magnetic yoke, rotor support, and shaft.

[0003] When the rotor rotates, the yoke bears the centrifugal and torque loads from all the magnetic poles and its own force, while the rotor support mainly bears the torque load and its own centrifugal load. Due to the difference in the type and magnitude of the loads they bear, the yoke and rotor support will experience relative deformation in the radial direction. The rotor leads and their fixing accessories, fixed to the yoke and rotor support, are forced to bear the additional load caused by this relative deformation during operation. With the frequent start-stop of the generator-motor, this relative deformation occurs cyclically, causing the rotor leads and their fixing accessories, located at the transition position between the yoke and rotor support, to endure alternating fatigue loads over a long period.

[0004] like Figure 1 The diagram illustrates a typical rotor lead fixing structure at the transition between the yoke and rotor support in the prior art. In this structure, the rotor leads are fixed to the yoke side and the rotor support side by rigid clamps, respectively, without any flexible structure to absorb radial displacement differences. When the yoke and rotor support deform relative to each other, a large load is applied to the clamp bolts fixing the leads, resulting in significant stress. After long-term repeated start-stop operation, these clamp bolts are highly susceptible to fatigue fracture. If the fractured bolts and debris fall into the air gap between the stator and rotor, it will cause a serious rotor rubbing accident, resulting in damage to the stator and rotor, or even the scrapping of the entire machine.

[0005] Chinese utility model patent CN212751953U, published on March 19, 2021, discloses a "Synchronous Generator Rotor Lead-Line Structure," which employs a Z-shaped copper busbar connection and multiple sets of fixing devices to mitigate lead-line vibration. However, this solution primarily addresses the vibration conditions of mining motors and does not address the radial relative displacement caused by centrifugal force differences between the yoke and rotor support in pumped-storage generators. Therefore, adapting to the deformation differences between the yoke and rotor support during operation and effectively reducing the stress amplitude of the rotor leads and their fixing accessories crossing the transition point between the two are critical issues affecting the reliability of the pumped-storage generator rotor leads and even the overall operational safety of the generator, and urgently need to be resolved. Summary of the Invention

[0006] This invention addresses the technical problem that the rotor leads and their fixing accessories at the transition point between the yoke and rotor support experience significant stress and are prone to fatigue fracture during unit operation due to the deformation difference between them. It proposes an installation method and fixing structure to improve the reliability of the rotor leads in pumped storage generator motors. This invention pre-deforms the rotor leads at point R to generate compressive stress, effectively reducing the tensile stress at R during rated operation. This reduces the stress amplitude at point R, improves the fatigue resistance of the leads, and ensures the reliability of the rotor leads.

[0007] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: An installation method for improving the reliability of rotor leads of a pumped storage generator motor includes the following steps: S1. Arrange the first lead wire near the yoke side at the transition position between the magnetic yoke and the rotor support in a Z-shape. The first lead wire includes the middle section and the bends at both ends. During installation, first assemble and connect the end of the first lead wire near the inner diameter of the rotor to the second wire clamp. S2. Fix one end of the first lead wire near the outer diameter of the rotor to the wire clamp pad of the fan on the magnetic yoke using the first wire clamp; at this time, the bottom of the pad of the second wire clamp is in contact with the support plate on the rotor bracket, and the second wire clamp and the support plate are in a relatively sliding unfixed state in the radial direction, so as not to introduce additional stress caused by installation. S3. Adjust the middle section of the first lead wire so that it undergoes pre-deformation in the opposite direction of the force during unit operation. The amount of pre-deformation is equal to the amount of force deformation of the first lead wire when the unit is running at rated speed. S4. After determining the pre-deformation amount, weld and fix the pad of the second wire clamp to the support plate on the rotor bracket. S5. After welding, clean the area thoroughly and then install the third wire clamp to fix the second lead to the rotor support. Based on the actual distance between the second lead and the rotor support after pre-deformation, process the insulating pad of the third wire clamp to the appropriate thickness on site so that the insulating pad just contacts the second lead and the rotor support.

[0008] Furthermore, the end of the first lead wire near the inner diameter of the rotor overlaps with the end of the second lead wire near the rotor support in the horizontal direction, and the overlap is fixedly assembled into one piece by the second wire clamp.

[0009] Furthermore, after the end of the first lead wire near the inner diameter of the rotor is assembled and connected to the second wire clamp, its end continues to extend to overlap with the second lead wire near the rotor support in the vertical direction, and the overlap is fixed by the wire clamp.

[0010] Furthermore, the second wire clamp includes an upper insulating plate II and a lower insulating plate II respectively disposed above and below the lead wire, a pad with a screw hole disposed below the lower insulating plate II, a steel pressure plate II disposed above the upper insulating plate II, and a second wire clamp bolt that assembles and connects the steel pressure plate II, the upper insulating plate II, the lower insulating plate II, and the pad together.

[0011] Furthermore, in step S3, the pre-deformation amount of the middle section of the first lead is determined in the following manner: The rotor is modeled according to its actual structure. The modeling targets include the rotor support, magnetic yoke, magnetic poles, magnetic yoke fan, the bond between the magnetic yoke and the rotor support, and the bond between the magnetic yoke and the magnetic poles. The aforementioned components are meshed, and the contact conditions between each component are set; the tightness of the key between the magnetic yoke and the rotor support is set; the deformation of the rotor relative to its stationary state at the rated speed is calculated. Calculate the radial displacement difference S between the clamp pad of the first clamp assembly and the support plate on the rotor bracket when running at rated speed and when stationary, and use this value S as the pre-deformation amount of the middle section of the first lead wire.

[0012] Preferably, in step S3, the adjustment of the middle section of the first lead wire to pre-deform it in the opposite direction of the force applied during unit operation is performed as follows: Use a U-shaped steel pad with connecting ears on both sides and an insulating pad. Use two positioning bolts to pass through the through holes on the connecting ears on both sides of the U-shaped steel pad, and prepare to screw them into the threaded holes opened on the inner diameter wall of the magnetic yoke. First, tighten the positioning bolt until the bottom of the U-shaped groove of the steel pad contacts the inner diameter side of the middle section of the first lead wire. At this time, the bolt head also contacts the U-shaped steel pad. Continue to tighten the two positioning bolts to ensure that the two positioning bolts are tightened at the same distance, so that the radial outward displacement of the shim is S.

[0013] Preferably, the length of the middle section of the first lead is L, and the lead thickness is b, which satisfies the relationship L / b=8~15.

[0014] Preferably, the inner diameter R at the two bends of the first lead wire satisfies R / b = 2~4. Preferably, the upper insulating plate II and the lower insulating plate II are laminated glass cloth boards with a thickness of 8mm to 15mm; the second wire clamp bolt is a 10.9 grade high-strength bolt.

[0015] Furthermore, in step S4, when the assembly of the first lead wire near the inner diameter of the rotor is welded and fixed to the support plate on the rotor bracket, fillet welds are used around the pad, and argon arc welding is used for the welding method.

[0016] On the other hand, based on the above method, the present invention also proposes a fixing structure for improving the reliability of the rotor leads of a pumped-storage generator motor, which is obtained by the above-mentioned installation method for improving the reliability of the rotor leads of a pumped-storage generator motor, including: The first lead is located at the transition position between the rotor support and the magnetic yoke. The first lead is arranged in a Z-shape, including the middle section and the bends at both ends. The first wire clamp is used to fix one end of the first lead wire near the outer diameter of the rotor to the wire clamp pad of the fan on the magnetic yoke; The second wire clamp is assembled and connected to one end of the first lead wire near the inner diameter of the rotor, and the second wire clamp includes a pad. The support plate is fixed to the rotor bracket; The shim is welded and fixed to the support plate; The middle section of the first lead has a pre-deformation in the opposite direction of the force applied during unit operation, and the amount of pre-deformation is equal to the amount of force deformation of the first lead when the unit is running at its rated speed.

[0017] In summary, the present invention has the following advantages: 1. This invention sets the first lead at the transition position between the magnetic yoke and the rotor support into a Z-shaped structure and adopts a pre-deformation installation method, so that the lead can actively adapt to the deformation difference between the magnetic yoke and the rotor support during operation, effectively reducing the stress of the rotor lead and its fixing accessories that cross the transition position, and significantly improving the reliability of unit operation.

[0018] 2. In this invention, the length L of the middle section of the first lead wire and the lead wire thickness b satisfy L / b=8~15, which gives the lead wire sufficient structural flexibility to fully adapt to the deformation differences of the magnetic yoke and rotor support between rotor operation and static conditions; at the same time, the inner diameter R at the bend and the lead wire thickness b satisfy R / b=2~4, which prevents large stress concentration at the bend when the lead wire is deformed, further improving the reliability of the lead wire.

[0019] 3. During installation, the present invention generates compressive stress at the bending point R of the lead wire through pre-deformation, which effectively reduces the tensile stress at R under rated speed conditions, thereby significantly reducing the stress amplitude. This is of great significance for improving the fatigue performance of the lead wire and ensuring the long-term safe operation of the rotor lead wire.

[0020] 4. The present invention uses a steel pad and positioning bolts to adjust the middle section of the first lead wire, which can accurately control the pre-deformation amount and ensure that the lead wire is fixed at one end of the inner diameter while maintaining the pre-deformation amount, thus ensuring the realization of the pre-deformation effect.

[0021] 5. In this invention, the wire clamp bolt only bears the torsional stress, tensile stress and centrifugal force generated by the wire clamp, etc., and basically does not bear the additional load caused by the relative displacement of the magnetic yoke and rotor support during operation, thereby significantly improving the operational reliability of the wire clamp bolt.

[0022] 6. The rotor lead fixing method in this invention allows the wire clamp bolts to only bear the torsional stress, tensile stress, and certain centrifugal force generated by the wire clamps during tightening, and basically does not bear the additional load caused by the relative displacement of the magnetic yoke and rotor support during operation, thereby greatly improving reliability.

[0023] 7. Based on the change of the first lead installation method, the present invention adopts a vertical overlapping method to connect one end of the inner diameter side of the first lead to the second lead, which makes the installation more convenient and can ensure good contact of each overlapping surface, while avoiding axial internal stress of the lead caused by installation. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a prior art structure for fixing rotor leads at the transition between the magnetic yoke and the rotor support. Figure 2 This is a schematic diagram of a fixing structure for improving the reliability of the rotor leads of a pumped storage generator motor according to the present invention; Figure 3 This is a detailed view of a fixing structure for improving the reliability of the rotor leads of a pumped storage power generator according to the present invention; Figure 4 for Figure 3 A schematic diagram of the steel plate in direction A; Figure 5 for Figure 4 BB view; Figure 6 The diagram shows the deformation of the first lead wire before and after pre-bending. a) indicates the state of the first lead wire before installation, b) indicates the state of the first lead wire during installation, and c) indicates the state of the first lead wire during rated operation. Figure 7 This is a schematic diagram of the rotor lead arrangement structure in Embodiment 2 of the present invention.

[0025] In the picture: 1. Rotor support; 2. Magnetic yoke; 3. First lead wire; 4. Second lead wire; 5. First wire clamp; 51. Wire clamp pad; 52. Steel pressure plate I; 53. Upper insulation plate I; 54. Lower insulation plate I; 55. First wire clamp bolt; 6. Third wire clamp; 7. Second wire clamp; 71. Pad; 72. Steel pressure plate II; 73. Upper insulation plate II; 74. Lower insulation plate II; 75. Second wire clamp bolt; 8. Support plate; 9. Steel pad; 10. Positioning bolt; 11. Insulation pad. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] Example 1 This invention proposes an installation method to improve the reliability of the rotor leads of a pumped-storage generator motor, referring to... Figure 2 and Figure 3 As shown, it includes the following steps: Step 1: Arrange the first lead 3 near the yoke 2 at the transition position between the magnetic yoke 2 and the rotor support 1 in a Z-shape. The first lead 3 includes a middle section and bends at both ends. During installation, first assemble and connect the end of the first lead 3 near the inner diameter of the rotor to the second clamp 7.

[0029] In this scheme, "Z-shaped" is used to indicate that the first lead 3 has the shape characteristics of a middle section and two bends at both ends. It does not mean that its shape is exactly the same as Z-shaped. It can also be called "S-shaped".

[0030] Preferably, the length of the middle section of the first lead 3 is L, the lead thickness is b, and the value of L / b is preferably 8 to 15. In this design, the first lead 3 has sufficiently good structural flexibility to adapt to the deformation differences of the magnetic yoke 2 and the rotor support 1 between rotor running and stationary conditions, thereby improving the reliability of the rotor lead.

[0031] Preferably, the inner diameter R at the two bends of the first lead 3 satisfies R / b = 2 to 4. The first lead 3 uses a larger bending radius, so that there will be no large stress concentration at the bends during deformation, thus improving the reliability of the lead.

[0032] The middle part of the Z-shaped lead structure is 8 to 15 times the thickness, which provides sufficient structural flexibility to accommodate the deformation differences of the magnetic yoke 2 and rotor support 1 between rotor operation and stationary conditions. The Z-shaped lead uses a bending radius of 2 to 4 times the lead thickness, so that when the first lead 3 deforms, there will be no large stress concentration at the bend, which improves the reliability of the rotor lead.

[0033] The second wire clamp 7 includes a pad 71, a steel pressure plate 72, an upper insulating plate II 73, a lower insulating plate II 74, and a second wire clamp bolt 75. During installation, if... Figure 3 As shown, the end of the first lead 3 near the inner diameter of the rotor is horizontally overlapped with the end of the second lead 4 near the rotor support 1. An upper insulating plate II 73 and a lower insulating plate II 74 are installed above and below the overlap, respectively. A pad 71 with screw holes is set below the lower insulating plate II 74. A steel pressure plate II 72 is set above the upper insulating plate II 73. The steel pressure plate II 72, the upper insulating plate II 73, the lower insulating plate II 74, and the pad 71 are assembled and connected together using a second wire clamp bolt 75.

[0034] Step 2: Fix the end of the first lead 3 closest to the outer diameter of the rotor (the yoke end) to the fan clamp pad 51 on the yoke 2 using the first wire clamp 5. After fixing the yoke end, the bottom of the pad 71 of the second wire clamp 7 should just contact the support plate 8 on the rotor bracket 1, and the second wire clamp 7 and the support plate 8 should remain in a radially sliding, unfixed state to avoid introducing additional stress caused by installation.

[0035] Specifically, the wire clamp pad 51 is welded to the lower ring plate of the fan on the magnetic yoke 2. A lower insulating plate I54 is provided between the first lead 3 and the wire clamp pad 51. An upper insulating plate I53 and a steel pressure plate 52 are arranged in sequence above the lead. The first wire clamp 5 is fixed together with the steel pressure plate 52, the upper insulating plate I53, the lower insulating plate I54 and the wire clamp pad 51 by the first wire clamp bolt 55.

[0036] Preferably, in this scheme, both the first clamp bolt 55 and the second clamp bolt 75 are 10.9 grade high-strength bolts.

[0037] Preferably, the insulating boards mentioned above are all 8mm to 15mm laminated glass cloth boards.

[0038] Step 3: Adjust the middle section of the first lead 3 so that it undergoes pre-deformation in the opposite direction of the force applied during unit operation. The amount of pre-deformation is equal to the amount of deformation of the first lead 3 when the unit is running at its rated speed.

[0039] Furthermore, the pre-deformation amount of the middle section of the first lead 3 is determined using the following finite element calculation: The rotor is modeled according to the actual structure. The modeling targets include rotor support 1, magnetic yoke 2, magnetic poles, magnetic yoke fan, the bond between magnetic yoke 2 and rotor support, and the bond between magnetic yoke and magnetic poles. The above components are meshed using a hexahedral mesh; The contact conditions between each component are set to standard contact; the tightness of the key between the magnetic yoke 2 and the rotor support 1 is set in advance through calculation. Then calculate the deformation of the rotor relative to its stationary state at the rated speed; After the calculation is completed, the radial distance between the clamping pad 51 and the support plate 8 is extracted under static state and under rated speed, and the difference S between the two is calculated as the pre-deformation amount of the middle section of the first lead wire 3.

[0040] Furthermore, adjust the middle section of the first lead 3 to pre-deform it in the opposite direction of the force applied during unit operation, as follows: like Figure 4 and Figure 5 As shown, a U-shaped steel pad 9 with connecting ears on both sides and an insulating pad is used. Two positioning bolts 10 are passed through the through holes on the connecting ears on both sides of the U-shaped steel pad 9, and are ready to be screwed into the threaded holes opened on the inner diameter wall of the magnetic yoke 2. First, tighten the positioning bolt 10 until the bottom of the U-shaped groove of the steel pad 9 contacts the inner diameter side of the middle section of the first lead wire 3. At this time, the bolt head also contacts the U-shaped steel pad 9. Continue to tighten the two positioning bolts 10 to ensure that the screwing distance of the two bolts is consistent, so that the radial outward displacement of the shim 71 is S (at this time, the second clamp 7 and the support plate 8 are not yet fixed and can slide relative to each other).

[0041] The above operation can precisely control the pre-deformation amount of the middle section of the first lead 3, and fix one end of the first lead 3 on the inner diameter side while maintaining the pre-deformation amount S.

[0042] By using the pre-deformation method described above to generate compressive stress at point R of the lead wire, the tensile stress at point R during the rated speed operation of the unit is reduced, thereby greatly reducing the stress amplitude. This is of great significance for improving the fatigue performance of the lead wire and ensuring the reliability of the rotor lead wire.

[0043] Step 4: After determining the pre-deformation amount, weld and fix the shim 71 to the support plate 8 on the rotor bracket 1. All four sides of the shim 71 are welded with fillet welds. The welding method is argon arc welding to reduce heat input and avoid generating more weld slag.

[0044] After fixing one section of the inner diameter side of the first lead wire 3, the steel pad 9 and the corresponding two positioning bolts 10 need to be removed. At this time, the first lead wire 3 still maintains the pre-deformation amount.

[0045] After the two ends of the first lead 3 are fixed with wire clamps, the wire clamp bolts only bear the torsional stress, tensile stress and centrifugal force generated by the tightening, and basically do not bear the additional load caused by the relative displacement of the magnetic yoke and rotor support during operation, thus greatly improving reliability.

[0046] Step 5: After welding, clean the area thoroughly and then install the third wire clamp 6 to fix the second lead 4 onto the rotor support 1. Based on the actual distance between the second lead 4 and the rotor support 1 after pre-deformation, process the insulating pad 11 of the third wire clamp 6 on-site to the appropriate thickness so that the insulating pad 11 just contacts the second lead 4 and the rotor support 1, avoiding the introduction of internal stress during installation due to positional deviation caused by pre-deformation.

[0047] like Figure 3 As shown, the second lead 4 also adopts a Z-shaped arrangement, and its vertical section is fixed to the rotor support 1 by the third wire clamp 6. The structure and installation method of the third wire clamp 6 are basically the same as those of the first wire clamp 5 and the second wire clamp 7.

[0048] The working principle of this invention is as follows: Figure 6 As shown in the figure, x represents the radial distance between the centers of the arcs at both ends of the first lead wire's bends, corresponding to the dimensions in the free state before lead wire installation and in the rated operating state of the unit; y represents the radial distance between the centers of the arcs at both ends of the first lead wire in the pre-deformed state of assembly. This scheme arranges the first lead wire 3 at the transition position between the magnetic yoke 2 and the rotor support 1 in a Z-shape, leaving a pre-deformation amount opposite to the force direction during unit operation. After the unit starts, the internal stress generated by this pre-deformation is released, significantly reducing the stress at the bends of the first lead wire 3 during rated speed operation, thereby improving the fatigue resistance of the lead wire and the operational safety of the unit.

[0049] Example 2 Based on Embodiment 1, this embodiment addresses the issue that the Z-shaped arrangement of both the first lead 3 and the second lead 4 makes it difficult to ensure good contact at each overlapping surface. Figure 7 The lead wire arrangement is shown.

[0050] After the first lead 3 is assembled and fixed to the inner diameter side of the rotor with the second clamp 7, its end continues to extend to overlap with the second lead 4 in the vertical direction, and the overlap is fixed with the clamp.

[0051] With the above settings, the horizontal overlap of the first lead 3 and the second lead 4 in Embodiment 1 is changed to a vertical overlap, which makes installation more convenient and ensures that each overlap surface of the lead can make good contact, while avoiding the internal stress in the axial direction of the lead caused by installation.

[0052] Example 3 Based on the content of Embodiment 1 or Embodiment 2 above, this embodiment also provides a fixing structure to improve the reliability of the rotor lead of a pumped storage generator motor. This fixing structure mainly includes: a first lead 3 disposed at the transition position between the rotor support and the yoke. The first lead 3 is arranged in a Z-shape. One end of the first lead 3, near the yoke side, is fixed to the clamp pad 51 of the fan on the yoke via a first clamp 5. The other end, near the inner diameter of the rotor, is assembled and connected to a second clamp 7. The pad 71 of the second clamp 7 is welded and fixed to a support plate 8 fixed on the rotor support 1. The middle section of the first lead 3 has a pre-deformation in the opposite direction of the force applied during unit operation, and the amount of pre-deformation is equal to the amount of force deformation of the first lead 3 when the unit is running at its rated speed.

[0053] Preferably, in this fixing structure, the length L of the middle section of the first lead 3 satisfies L / b = 8~15, and the inner diameter R at the two bends satisfies R / b = 2~4, so that the lead has good structural flexibility and resistance to stress concentration. The bolts of the first clamp 5 and the second clamp 7 are both 10.9 grade high-strength bolts, and the insulating plate is an 8mm~15mm thick laminated glass cloth plate. The specific functions of the above preferred parameters have been explained in detail in Embodiments 1 and 2, and will not be repeated here.

[0054] The assembly of the first wire clamp 5, the second wire clamp 7, and the third wire clamp 6, as well as the overlapping and fixing methods between the leads, are consistent with those in Embodiments 1 and 2, and will not be repeated here.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An installation method for improving the reliability of the rotor leads of a pumped-storage generator motor, characterized in that, Includes the following steps: S1. Arrange the first lead wire (3) near the magnetic yoke (2) at the transition position between the magnetic yoke (2) and the rotor support (1) in a Z-shape. The first lead wire (3) includes the middle section and the bends at both ends. During installation, first assemble and connect the end of the first lead wire (3) near the inner diameter of the rotor with the second wire clamp (7). S2. Fix one end of the first lead wire (3) near the outer diameter of the rotor to the wire clamp pad (51) of the fan on the magnetic yoke (2) using the first wire clamp (5); at this time, the bottom of the pad (71) of the second wire clamp (7) is in contact with the support plate (8) on the rotor bracket (1), and the second wire clamp (7) and the support plate (8) are in a relatively sliding unfixed state in the radial direction, so as not to introduce additional stress caused by installation; S3. Adjust the middle section of the first lead (3) so that it undergoes pre-deformation in the opposite direction of the force during unit operation. The amount of pre-deformation is equal to the amount of force deformation of the first lead (3) during rated speed operation of the unit. The amount of pre-deformation of the middle section of the first lead (3) is determined in the following manner: The rotor is modeled according to the actual structure. The modeling targets include the rotor support (1), the magnetic yoke (2), the magnetic poles, the magnetic yoke fan, the bond between the magnetic yoke (2) and the rotor support (1), and the bond between the magnetic yoke and the magnetic poles. The aforementioned components are meshed, and the contact conditions between each component are set; the tightness of the key between the magnetic yoke (2) and the rotor support (1) is set; then the deformation of the rotor relative to the stationary state at the rated speed is calculated; Calculate the radial displacement difference S between the clamp pad (51) assembled with the first clamp (5) and the support plate (8) on the rotor bracket (1) when running at rated speed and when stationary, and use this value S as the pre-deformation amount of the middle section of the first lead wire (3). S4. After determining the pre-deformation amount, weld and fix the pad (71) of the second wire clamp (7) to the support plate (8) on the rotor bracket (1); S5. After welding, clean the area and then install the third clamp (6) to fix the second lead (4) on the rotor support (1). Based on the actual distance between the second lead (4) and the rotor support (1) after pre-deformation, process the insulating pad (11) of the third clamp (6) to the corresponding thickness on site so that the insulating pad (11) just contacts the second lead (4) and the rotor support (1).

2. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 1, characterized in that, In step S1, the end of the first lead wire (3) near the inner diameter of the rotor overlaps with the end of the second lead wire (4) near the rotor support (1) in the horizontal direction, and the overlap is fixedly assembled into one piece by the second wire clamp (7).

3. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 1, characterized in that, The second wire clamp (7) includes an upper insulating plate II (73) and a lower insulating plate II (74) respectively disposed above and below the lead wire, a pad with a screw hole disposed below the lower insulating plate II (74), a steel pressure plate II (72) disposed above the upper insulating plate II (73), and a second wire clamp bolt (75) that assembles and connects the steel pressure plate II (72), the upper insulating plate II (73), the lower insulating plate II (74), and the pad (71) together.

4. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 1, characterized in that, In step S3, the adjustment of the middle section of the first lead wire (3) to pre-deform it in the opposite direction of the force during unit operation is carried out as follows: Using a U-shaped steel pad (9) with connecting ears on both sides and an insulating pad, two positioning bolts (10) are passed through the through holes on the connecting ears on both sides of the U-shaped steel pad (9) and are ready to be screwed into the threaded holes on the inner diameter wall of the magnetic yoke (2). First, tighten the positioning bolt (10) until the bottom of the U-shaped groove of the steel pad (9) contacts the inner diameter side of the middle section of the first lead wire (3). At this time, the bolt head also contacts the U-shaped steel pad (9). Continue to tighten the two positioning bolts (10) to ensure that the two positioning bolts (10) are tightened at the same distance, so that the radial outward displacement of the pad (71) is S.

5. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 1, characterized in that, The length of the middle section of the first lead (3) is L, and the thickness of the lead is b, which satisfies the relationship L / b=8~15.

6. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 1, characterized in that, The inner diameter R of the two bends of the first lead (3) satisfies R / b=2~4, where b is the lead thickness.

7. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 3, characterized in that, The upper insulating plate II (73) and the lower insulating plate II (74) are laminated glass cloth plates with a thickness of 8mm to 15mm; the second wire clamp bolt (75) is a 10.9 grade high-strength bolt.

8. The installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in claim 1, characterized in that, In step S4, when the assembly of the first lead wire (3) near the inner diameter of the rotor is welded and fixed to the support plate (8) on the rotor bracket (1), the shim (71) is welded with fillet welds around its perimeter, and the welding method is argon arc welding.

9. A fixing structure for improving the reliability of the rotor leads of a pumped-storage generator motor, obtained by adopting an installation method for improving the reliability of the rotor leads of a pumped-storage generator motor as described in any one of claims 1 to 8, characterized in that, The fixing structure includes: The first lead (3) is set at the transition position between the rotor support (1) and the magnetic yoke (2). The first lead (3) is arranged in a Z-shape, including the middle section and the bends at both ends. The first wire clamp (5) is used to fix one end of the first lead wire (3) near the outer diameter of the rotor to the wire clamp pad (51) of the fan on the magnetic yoke (2); The second wire clamp (7) is assembled and connected to one end of the first lead wire (3) near the inner diameter of the rotor. The second wire clamp (7) includes a pad (71). Support plate (8) is fixed to the rotor bracket (1); The pad (71) is welded and fixed to the support plate (8); the middle section of the first lead (3) has pre-deformation in the opposite direction of the force when the unit is running, and the amount of pre-deformation is equal to the amount of force deformation of the first lead (3) when the unit is running at rated speed.

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