A full-air-cooled camera stator end fixing system and working method thereof

Abstract

The application provides a full-air-cooling phase modifier stator end fixing system and a working method thereof, and belongs to the technical field of large-scale synchronous phase modifier manufacturing. The system solves the problems of weak rigidity, large vibration amplitude, poor air-cooling heat dissipation effect, unreliable high-voltage insulation anti-browning, and difficult multi-turn coil fixing of the stator end of the prior art phase modifier. The system comprises a stator winding end, a perfusion type binding ring, a support assembly, an elastic connection assembly, a parallel ring fixing structure, and a full-area multi-branch ventilation air duct. The perfusion type binding ring is a non-tapered ring multi-section vertical perfusion structure, three section vertical perfusion areas are sequentially arranged along the stator winding end from a slot opening to a nose end, and a rigid body is formed in the circumferential direction of the stator winding end after solidification. Insulating blocks are arranged between upper and lower layer wire rods of a stator core. An end plate is arranged on the inner side of the stator winding end. The wire rods, the insulating blocks, and the end plate form a closed perfusion cavity. Ventilation gaps are reserved between the three perfusion areas. The system is mainly used for 35kV direct-connection type distributed phase modifiers.

Description

Technical Field

[0001] This invention belongs to the field of manufacturing technology of large synchronous condensers, and in particular relates to a stator end fixing system for an all-air-cooled synchronous condenser and its working method. Background Technology

[0002] Distributed synchronous condensers are core dynamic reactive power compensation devices that support large-scale grid connection of new energy sources and realize the transformation and upgrading of the energy structure. They have advantages such as fast response speed and strong reactive power support capability. Conventional distributed synchronous condensers are mostly rated at 10.5kV and must be connected to the high-voltage grid with a step-up transformer during operation. This results in disadvantages such as large equipment footprint, high system losses, and high construction costs.

[0003] To address this, the industry has developed a 35kV direct-connected distributed synchronous condenser. This model can be directly connected to the 35kV high-voltage grid without the need for a transformer, and its transient reactive power output capacity is 1.5 to 2 times that of a conventional synchronous condenser of the same capacity, demonstrating significant technological advantages. Currently, the industry has completed the design and trial production of water-cooled 35kV direct-connected synchronous condensers. However, water-cooling systems suffer from problems such as complex piping, leakage risks, high maintenance costs, and poor adaptability to low-temperature environments. Therefore, fully air-cooled 35kV direct-connected synchronous condensers have become the mainstream research and development direction.

[0004] 35kV is an ultra-high voltage level, and the equipment operates in air. The insulation and corona prevention design standards are far higher than those of conventional 10.5kV models. According to the insulation and corona prevention technical requirements, the stator winding ends must adopt a potting seal structure. At the same time, in order to meet the electromagnetic design requirements, the stator of this model adopts a single multi-turn bar structure, and the overall stiffness of the bar is relatively small. There are long axially suspended sections in the end insulation, which are prone to failures such as vibration deformation, insulation cracking, and partial discharge during operation. Traditional synchronous condenser stator ends generally adopt an integral potting structure with a conical ring, which has many defects: First, after integral potting, the ventilation channel at the end is largely blocked, making it difficult for the windings and parallel rings to dissipate heat under air-cooled conditions, resulting in excessive temperature rise; Second, the conical ring occupies limited space at the end, which cannot meet the electrical insulation distance required for 35kV high voltage; Third, the integral rigid structure has no axial elastic buffering capacity, and the end vibrates violently during unit start-up and shutdown and load fluctuations, which can easily cause fasteners to loosen and insulation aging to accelerate; Fourth, the traditional structure cannot adapt to the fixing requirements of multi-turn coils with axial misalignment and long suspended insulation sections.

[0005] In addition, the existing structure does not have a dedicated fixing and cooling structure for the parallel ring, which is prone to vibration and local overheating under high pressure conditions; the end potting process is mostly integral potting, which is difficult to process, inconvenient to inspect and disassemble, and has poor feasibility. Summary of the Invention

[0006] In view of this, the present invention aims to propose a fully air-cooled camera stator end fixing system and its working method to solve the problems of weak stator end stiffness, large vibration amplitude, poor air-cooling heat dissipation effect, unreliable high-voltage insulation anti-corona, and difficulty in fixing multi-turn coils in the prior art camera stator.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a stator end fixing system for a fully air-cooled synchronous condenser, applied to a 35kV fully air-cooled direct-coupled distributed synchronous condenser. The synchronous condenser adopts a closed-loop air-cooling mode with an integrated air-cooler on top of the frame. The stator core, stator windings, and parallel rings are indirectly air-cooled, while the rotor windings adopt a direct air-cooling structure. The fixing system includes stator winding ends, injection-type binding rings, support components, elastic connection components, parallel ring fixing structures, and a full-area multi-branched ventilation duct. The injection-type binding rings are multi-segment vertical injection-type structures without cones, arranged sequentially from the slot to the nose end along the stator winding ends. Three segmented vertical glue-filling areas are provided, forming a circumferentially closed structure. After curing, the stator winding ends form a rigid body circumferentially. An insulating block is provided between the upper and lower layers of the stator core. An end pressure plate is provided on the inner side of the stator winding ends. The wires, insulating blocks, and end pressure plates together form a closed glue-filling cavity. Ventilation gaps are reserved between the three glue-filling areas. Radial ventilation holes are opened inside the glue-filling area at the nose end. The parallel ring fixing structure is arranged along the circumference of the stator core. The multi-branched ventilation ducts are arranged in stages along the inner space of the fixing system. The support components and elastic connection components are all connected to the glue-filling binding ring.

[0008] Furthermore, the support assembly includes three support rings, insulating supports, annular pressure rings, and eccentric sleeves. The three support rings correspond one-to-one with the three segmented glue-filling areas of the injection-type binding ring. Twelve insulating supports are evenly distributed axially at the end of the stator winding. The support rings are fixed to the top of the insulating supports by positioning pins. The inner and outer rings of the annular pressure rings are respectively provided with eccentric sleeves. The end of the stator winding is supported on the annular pressure ring by the eccentric sleeves.

[0009] Furthermore, the three support rings and the 12 insulating supports form a circumferentially evenly distributed support network.

[0010] Furthermore, the elastic connection assembly includes a spring plate, and the bottom of each insulating bracket is connected to an annular pressure ring via the spring plate.

[0011] Furthermore, both ends of the end pressure plate are provided with stainless steel bolts, which pass through the insulating sleeve and the support block in sequence and are fixed to the support ring.

[0012] Furthermore, the parallel ring fixing structure includes a parallel ring pressure plate, the parallel ring is fixed to the end nose of the stator winding by the parallel ring pressure plate, and a wind baffle is provided between the support ring and the base partition.

[0013] Furthermore, the full-area multi-branched ventilation duct has a single-entry, five-branched structure. The cold air is pressurized by the coaxial fans at both ends of the rotating shaft or the cooling fans built into the air cooler and then divided into five air paths: The first stream of cold air enters the air gap between the stator and rotor, the stator core, the pressure fingers, and the magnetic shield; The second stream of cold air flows through the gap between the first and second glue-filling areas of the injection-type binding ring, cooling the windings at the ends. Part of the air flows into the back of the stator core through the ventilation holes on the base plate, while the other part merges with the first stream of cold air. The third cold air flows through the gap between the second and third glue-filling areas of the injection-type binding ring, cools the end winding and parallel ring, and then merges into the back of the stator core. The fourth stream of cold air passes through the radial ventilation holes, cools the winding nose and parallel ring, and then flows into the back of the stator core. The fifth stream of cold air flows along the inside of the baffle plate, is cooled by the radial ventilation holes and connected in a loop, and then flows into the back of the stator core through the ventilation holes.

[0014] Furthermore, the fixing system uses multi-adhesive mica insulation material, and the injection-type binding ring shortens the creepage distance.

[0015] Furthermore, the outer side of the insulating block is covered with polyester felt.

[0016] A method for operating a fully air-cooled camera stator end fixing system includes the following steps: Step 1: Fill the space between the upper and lower layers of wire bars at the end of the stator winding with insulating blocks covered with polyester felt. Install end pressure plates on the inside of the stator end, so that the wire bars, insulating blocks, and end pressure plates enclose three independent closed potting cavities. Pour insulating glue into each cavity and let it cure. Along the end of the stator winding from the slot to the nose, the first potting area, the second potting area, and the third potting area are formed in sequence. The three potting areas form a circumferentially closed potting binding ring, so that the stator end forms a rigid body circumferentially. Step 2: Fix the three support rings to the top of the insulating brackets on the outside of the three glue-filling areas respectively. Place the bottom of the insulating brackets on the eccentric sleeve on the annular pressure ring. Adjust the support height and coaxiality by rotating the eccentric sleeve. Connect the bottom of each insulating bracket to the annular pressure ring through the spring plate, so that the stator end, the glue-filling binding ring and the support ring form an axial elastic connection structure. Step 3: Arrange a parallel ring at the nose end of the stator winding, lock and fix the parallel ring to the back of the nose end by the parallel ring pressure plate, and install a baffle plate between the support ring and the base partition to form a special cooling air duct for the parallel ring. Step 4: Start the coaxial fans at both ends of the shaft or the built-in cooling fan of the air cooler to pressurize the cooling medium and form a single-entry, five-branching airflow distribution: The first stream of cold air enters the air gap between the stator and rotor to cool the stator core, finger presses, and magnetic shield. The second stream of cold air flows through the gap between the first and second glue-filling areas, cooling the windings at the end of the cooling slot. Part of the cold air flows into the back of the core through the ventilation holes of the base plate, while the other part merges with the first stream of cold air. The third cold air flows through the gap between the second and third glue-filling areas, cools the middle winding and parallel ring, and then flows into the back of the core. The fourth stream of cold air passes through the radial ventilation holes inside the third glue-filling area, cools the winding nose and parallel ring, and then flows into the back of the core. The fifth stream of cold air flows along the inside of the baffle plate, providing directional cooling and then connecting in a loop before converging into the back of the core through the ventilation holes.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a potting-type binding ring, with multi-segment vertical potting replacing the traditional conical ring integral potting structure. The three independent potting areas form a circumferential rigid body, effectively compensating for the deficiency of low stiffness of multi-turn wire rods and eliminating insulation deformation. Combined with an insulation bracket, eccentric sleeve, and spring plate to form an elastic support system, it has both overall rigidity and axial elastic buffering capacity, significantly reducing the amplitude of end vibration, protecting long suspended insulation sections and fasteners, and extending the service life of the equipment.

[0018] 2. This invention relies on the segmented gaps of the injection-type binding ring, the radial ventilation holes at the nose end, and the baffle plate to construct a five-way zoned ventilation duct, which achieves layered and directional cooling of the stator core, end windings, nose end, and parallel ring. This solves the industry pain points of ventilation blockage and poor heat dissipation in the overall potting structure, and is fully adaptable to the all-air-cooled operation condition. The temperature rise meets the design standards under the high electrical density condition of the stator.

[0019] 3. The entire system of this invention is matched with the insulation parameters specific to the 35kV air environment, adopts a mature multi-adhesive mica insulation system, and the electrical clearance and insulation thickness are strictly designed according to high voltage specifications; the segmented injection-type binding ring shortens the creepage distance, effectively suppresses partial discharge, improves the insulation's resistance to aging and anti-corona discharge performance, and is suitable for the long-term operation requirements of ultra-high voltage.

[0020] 4. The injection-type binding ring of this invention adopts a multi-segment vertical injection process. Compared with the whole injection process, the injection operation is simple, the glue is fully filled, and there are fewer air bubbles. The segmented structure facilitates disassembly and maintenance in the later stage. Core components such as rotor slot wedge cutters and brush holders use common parts of conventional models, which reduces production and manufacturing costs and spare parts costs.

[0021] 5. This invention eliminates the traditional conical ring structure, freeing up the limited space at the stator end. It simultaneously meets multiple requirements such as high-voltage insulation distance, ventilation channel, mechanical fixing, and potting molding within a narrow space. The overall outer diameter layout is reasonable, the equipment has a high degree of integration, and the on-site installation is convenient. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a fully air-cooled camera stator end fixing system according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a fully air-cooled camera stator end fixing system according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the circumferential distribution structure of the injection-type binding ring; Figure 4 A schematic diagram of the assembly of the support components and the flexible connection components; Figure 5 Enlarged view of the assembly of the parallel ring fixing and the wind deflector; Figure 6 This is a schematic diagram of the air cooler and coaxial fan installation.

[0023] In the picture: 1-Stator core, 2-Stator winding end, 3-Injection-type binding ring, 31-First injection zone, 32-Second injection zone, 33-Third injection zone, 34-Radial ventilation hole, 4-End pressure plate, 5-Insulating block, 6-Polyester felt, 7-Support ring, 8-Insulating bracket, 9-Positioning pin, 10-Annular pressure ring, 11-Eccentric sleeve, 12-Spring plate, 13-Stainless steel bolt, 14-Insulating sleeve, 15-Support block, 16-Parallel ring, 17-Parallel ring pressure plate, 18-Wind baffle, 19-Base partition, 20-Ventilation hole, 21-Stator-rotor air gap, 22-Pressure finger, 23-Magnetic shield, 24-Air cooler, 25-Coaxial fan. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0025] Detailed Implementation Method 1: See Figure 1-6This embodiment describes a 35kV fully air-cooled direct-coupled distributed synchronous condenser with a rated voltage of 35kV. It employs a closed-loop air-cooling mode, with an air-cooled cooler 24 installed on the top of the base. Cooling air is circulated by coaxial fans 25 at both ends of the rotating shaft. The stator core 1, stator winding ends 2, and parallel ring 16 utilize indirect air cooling, while the rotor winding uses direct air cooling. The injection-type binding ring 3 adopts a three-section vertical segmented injection structure without a cone, dividing the first injection zone sequentially from the slot opening to the nose end along the stator winding end 2. 31. The second grouting area 32 and the third grouting area 33 together form a circumferentially closed grouting binding ring 3. Insulating blocks 5 are filled between the upper and lower layers of the stator core 1, and polyester felt 6 is wrapped around the outside of the insulating blocks 5. End pressure plates 4 are installed around the inner side of the stator end. The bars, insulating blocks 5, and end pressure plates 4 together form three independent closed cavities as grouting cavities. Insulating glue is injected into the cavities using a multi-segment vertical grouting process. After curing, it forms a rigid whole, which greatly improves the circumferential stiffness of the stator winding end 2.

[0026] Furthermore, ventilation gaps are reserved between the three glue-filling zones. A radial ventilation hole 34 is opened inside the nose position of the third glue-filling zone 33 as a dedicated channel for cooling air. The traditional cone ring is eliminated in the injection-type binding ring 3, which fully releases the end space and meets the 35kV high-voltage electrical distance requirements.

[0027] Furthermore, corresponding to the three glue-filling areas of the injection-type binding ring 3, three annular support rings 7 are respectively set; 12 vertical insulating supports 8 are evenly arranged circumferentially at the stator end. The support rings 7 are fixed to the top of the insulating supports 8 by positioning pins 9. An annular pressure ring 10 is fixed inside the machine base. An eccentric sleeve 11 is installed on the inner and outer rings of the annular pressure ring 10. The bottom of the insulating support 8 is supported on the eccentric sleeve 11. The support height and coaxiality can be finely adjusted by rotating the eccentric sleeve 11, resulting in high positioning accuracy.

[0028] Furthermore, a spring plate 12 is fixed to the lower end of each insulating support 8, and the other end of the spring plate 12 is fixedly connected to the annular pressure ring 10, so that the entire stator end, the injection-type binding ring 3, and the support ring 7 form an axial elastic connection structure. The axial vibration generated during the operation of the unit can be flexibly buffered by the spring plate 12, avoiding rigid impact that could cause insulation cracking and fastener loosening.

[0029] Furthermore, M64 stainless steel bolts 13 are installed at both ends of the end pressure plate 4. The bolts pass through the insulating sleeve 14 and the support block 15 in sequence and are then locked onto the support ring 7 to achieve reliable fixation of the pressure plate.

[0030] In this embodiment, the stator core 1 has a total of 48 slots, with 6 conductors in each slot. Each conductor is a 3-turn or multi-turn coil. The upper and lower coils at the ends are axially offset by 70mm. After the coils are welded, hand-wrapped insulation is implemented. The overlap length of the hand-wrapped insulation and machine-wrapped insulation is 100mm. The axial suspension length of the insulation is 420mm. The suspension section is effectively constrained by the limiting effect of the end pressure plate 4 and the injection-type binding ring 3 to prevent vibration deformation.

[0031] Furthermore, a parallel ring 16 is arranged at the nose end position of the stator winding end 2, and a parallel ring pressure plate 17 is assembled on the outside of the parallel ring 16. It is pressed and fixed by fasteners to prevent the parallel ring 16 from shifting or vibrating. A baffle plate 18 is added between the support ring 7 and the base partition 19. The baffle plate 18 forms an independent closed air duct, which constitutes a special cooling channel for the parallel ring 16.

[0032] Furthermore, the full-area multi-branched ventilation duct has a single-entry, five-branched structure. The cold air is pressurized by the coaxial fans 25 at both ends of the rotating shaft or the cooling fans built into the air cooler 24, and then divided into five air paths to achieve full-area cooling. The first stream of cold air enters the stator-rotor air gap 21, flows through the stator core 1, pressure finger 22, and magnetic shield 23, and after cooling is completed, it flows into the back of the stator core 1. The second cold air passes through the gap between the first glue-filling area 31 and the second glue-filling area 32, cooling the winding on the slot side. Part of the airflow enters the back of the stator core 1 through the ventilation hole 20 of the base partition 19, and the other part merges with the first cold air to cool the pressure finger 22 and the magnetic shield 23. The third cold air passes through the gap between the second glue-filling area 32 and the third glue-filling area 33, cools the middle winding and the parallel ring 16, and then flows into the back of the stator core 1 through the ventilation hole 20. The fourth cold air passes through the radial ventilation hole 34 inside the third glue-filling area 33, cools the winding nose and parallel ring 16, and flows into the back of the stator core 1; The fifth stream of cold air flows along the inner side of the baffle plate 18, is directionally cooled through the radial ventilation holes 34 and connected in a loop 16. After cooling is completed, it flows into the back of the stator core 1 through the ventilation holes 20.

[0033] Furthermore, this fixing system adopts a multi-adhesive mica insulation system, with a double-sided insulation thickness of 16mm for the stator core 1 and a 31mm gap between the beveled edges of the end bars; the segmented injection-type binding ring 3 effectively shortens the creepage distance, improves the insulation's resistance to aging and anti-corona capabilities, and is suitable for long-term operation in a 35kV air environment.

[0034] During unit operation, the stator winding end 2 tends to vibrate due to electromagnetic force. However, since the three-section glue-filled area of ​​the injection-type binding ring 3 has circumferentially tightened the end bar into a rigid body, the vibration amplitude is greatly suppressed. At the same time, when the temperature changes, the bar expands and contracts axially. At this time, the spring plate 12 undergoes elastic deformation, absorbing the axial displacement and avoiding rigid strain. In terms of cooling airflow, the coaxial fan 25 or cooling fan pressurizes the cold air and sends it into the end cavity. The five air paths respectively target the air gap, different sections of the end winding, and the parallel ring 16 for precise cooling. Finally, all of them converge into the back of the stator core 1 to complete the circulation, realizing the efficient utilization of the cooling medium.

[0035] Detailed Implementation Method 2: See Figure 1-6 This embodiment describes a method for fixing the stator end of an air-cooled camera, which includes the following steps: Step 1: Fill the space between the upper and lower layers of wire bars at the stator winding end 2 with an insulating block 5 covered with polyester felt 6. Install an end pressure plate 4 on the inner side of the stator end, so that the wire bars, insulating block 5, and end pressure plate 4 enclose three independent closed potting cavities. Insulating glue is injected into each cavity and cured. The first potting area 31, the second potting area 32, and the third potting area 33 are formed sequentially from the slot opening to the nose end of the stator winding. The three potting areas form a circumferentially closed potting binding ring 3, so that the stator end forms a rigid body circumferentially. Step 2: Fix the three support rings 7 to the top of the insulating brackets 8 on the outside of the three glue-filling areas respectively. Place the bottom of the insulating brackets 8 on the eccentric sleeve 11 on the annular pressure ring 10. Adjust the support height and coaxiality by rotating the eccentric sleeve 11. Connect the bottom of each insulating bracket 8 to the annular pressure ring 10 through the spring plate 12, so that the stator end, the glue-filling binding ring 3 and the support rings 7 form an axial elastic connection structure. Step 3: Arrange a parallel ring 16 at the nose end of the stator winding end 2, and lock and fix the parallel ring 16 to the back of the nose end by the parallel ring pressure plate 17. Install a baffle plate 18 between the support ring 7 and the base partition plate 19 so that the baffle plate 18 forms a special cooling air duct for the parallel ring 16. Step 4: Start the coaxial fan 25 at both ends of the shaft or the built-in cooling fan of the air cooler 24 to pressurize the cooling medium and form a single-path air intake and five-path branching airflow distribution: The first stream of cold air enters the stator-rotor air gap 21 to cool the stator core 1, pressure fingers 22 and magnetic shield 23; The second cold air flows through the gap between the first glue-filling area 31 and the second glue-filling area 32, cooling the winding at the end of the cooling slot. Part of it flows into the back of the core through the ventilation hole 20 of the base partition 19, and the other part merges with the first cold air. The third cold air flows through the gap between the second glue-filling area 32 and the third glue-filling area 33, cools the middle winding and the parallel ring 16, and then flows into the back of the core. The fourth cold air passes through the radial ventilation hole 34 inside the third glue-filling area 33, cools the winding nose and parallel ring 16, and then flows into the back of the core. The fifth stream of cold air flows along the inner side of the baffle plate 18, provides directional cooling, and after connecting to the ring 16, it flows into the back of the core through the ventilation hole 20.

[0036] The specific embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A stator end fixing system for a fully air-cooled synchronous condenser, applied to a 35kV fully air-cooled direct-coupled distributed synchronous condenser, wherein the synchronous condenser adopts a closed-loop air-cooling mode with an integrated air-cooler (24) on the top of the frame, wherein the stator core (1), stator windings and parallel rings (16) adopt indirect air cooling, and the rotor windings adopt a direct air-cooling structure, characterized in that: The fixing system includes a stator winding end (2), a potting binding ring (3), a support assembly, an elastic connection assembly, a parallel ring (16) fixing structure, and a full-area multi-branched ventilation duct. The potting binding ring (3) is a multi-segment vertical potting structure without a cone ring. Three segmented vertical potting areas are set sequentially from the slot to the nose end along the stator winding end (2). The three potting areas form a circumferential closed structure. After curing, the stator winding end (2) forms a rigid body circumferentially. An insulating block is provided between the upper and lower layers of the stator core (1). 5) An end pressure plate (4) is provided on the inner side of the stator winding end (2). The wire bar, the insulating block (5) and the end pressure plate (4) together form a closed potting cavity. A ventilation gap is reserved between the three potting areas. A radial ventilation hole (34) is opened inside the potting area at the nose end. The parallel ring (16) fixing structure is arranged along the circumference of the stator core (1). The multi-branched ventilation duct of the whole domain is arranged in a step-by-step branching arrangement along the inner space of the fixing system. The support component and the elastic connection component are both connected to the potting binding ring (3).

2. The all-air-cooled camera stator end fixing system according to claim 1, characterized in that: The support assembly includes three support rings (7), an insulating bracket (8), an annular pressure ring (10), and an eccentric sleeve (11). The three support rings (7) correspond one-to-one with the three segmented glue-filling areas of the injection-type binding ring (3). Twelve insulating brackets (8) are evenly distributed axially at the end of the stator winding (2). The support rings (7) are fixed to the top of the insulating brackets (8) by positioning pins (9). The inner and outer rings of the annular pressure ring (10) are respectively provided with eccentric sleeves (11). The end of the stator winding (2) is supported on the annular pressure ring (10) by the eccentric sleeves (11).

3. The all-air-cooled camera stator end fixing system according to claim 2, characterized in that: The three support rings (7) and the 12 insulating supports (8) form a circumferentially evenly distributed support network.

4. The all-air-cooled camera stator end fixing system according to claim 2, characterized in that: The elastic connection assembly includes a spring plate (12), and the bottom of each insulating bracket (8) is connected to the annular pressure ring (10) via the spring plate (12).

5. The all-air-cooled camera stator end fixing system according to claim 2, characterized in that: Both ends of the end pressure plate (4) are provided with stainless steel bolts (13), which pass through the insulating sleeve (14) and the support block (15) in sequence and are fixed on the support ring (7).

6. The all-air-cooled camera stator end fixing system according to claim 2, characterized in that: The parallel ring (16) fixing structure includes a parallel ring pressure plate (17). The parallel ring (16) is fixed to the nose end of the stator winding end (2) by the parallel ring pressure plate (17). A wind baffle (18) is provided between the support ring (7) and the base partition (19).

7. The all-air-cooled camera stator end fixing system according to claim 6, characterized in that: The full-area multi-branched ventilation duct is a single-path air intake and five-path branching structure. The cold air is pressurized by the coaxial fans (25) at both ends of the rotating shaft or the cooling fans built into the air cooler (24) and then divided into five air paths: The first stream of cold air enters the stator-rotor air gap (21), stator core (1), pressure finger (22) and magnetic shield (23); The second cold air flows through the gap between the first glue-filling area (31) and the second glue-filling area (32) of the injection-type binding ring (3), cooling the winding at the end. Part of it flows into the back of the stator core (1) through the ventilation hole (20) on the base partition (19), and the other part merges with the first cold air. The third cold air flows through the gap between the second glue-filling area (32) and the third glue-filling area (33) of the injection-type binding ring (3), cools the end winding and the parallel ring (16) and then flows into the back of the stator core (1); The fourth cold air passes through the radial ventilation hole (34), cools the nose of the winding and the parallel ring (16), and then flows into the back of the stator core (1); The fifth cold air flows along the inside of the baffle plate (18), is cooled by the radial ventilation hole (34) and connected in a loop (16), and then flows into the back of the stator core (1) through the ventilation hole (20).

8. The all-air-cooled camera stator end fixing system according to claim 6, characterized in that: The fixing system uses multi-adhesive mica insulation material, and the injection-type binding ring (3) shortens the creepage distance.

9. The all-air-cooled camera stator end fixing system according to claim 1, characterized in that: The insulating block (5) is covered with polyester felt (6) on the outside.

10. A method for operating the all-air-cooled camera stator end fixing system as described in any one of claims 1-9, characterized in that: It includes the following steps: Step 1: Fill the space between the upper and lower layers of wire rods at the stator winding end (2) with an insulating block (5) covered with polyester felt (6). Install an end pressure plate (4) on the inside of the stator end so that the wire rods, insulating block (5), and end pressure plate (4) enclose three independent closed potting cavities. Pour insulating glue into each cavity and cure it. Along the stator winding end from the slot to the nose, the first potting area (31), the second potting area (32), and the third potting area (33) are formed in sequence. The three potting areas form a circumferentially closed potting binding ring (3), so that the stator end forms a rigid body circumferentially. Step 2: Fix the three support rings (7) to the top of the insulating brackets (8) on the outside of the three glue-filling areas respectively. Place the bottom of the insulating brackets (8) on the eccentric sleeve (11) on the annular pressure ring (10). Adjust the support height and coaxiality by rotating the eccentric sleeve (11). Connect the bottom of each insulating bracket (8) to the annular pressure ring (10) through the spring plate (12) so that the stator end, the glue-filling binding ring (3) and the support ring (7) form an axial elastic connection structure. Step 3: Arrange a parallel ring (16) at the nose end of the stator winding end (2), and lock the parallel ring (16) to the back of the nose end by means of the parallel ring pressure plate (17). Install a baffle plate (18) between the support ring (7) and the base partition plate (19) so that the baffle plate (18) forms a special cooling air duct for the parallel ring (16). Step 4: Start the coaxial fan (25) at both ends of the shaft or the built-in cooling fan of the air cooler (24) to pressurize the cooling medium and form a single-path air intake and five-path branching airflow distribution: The first stream of cold air enters the air gap between the stator and rotor (21) to cool the stator core (1), the pressure fingers (22), and the magnetic shield (23). The second cold air flows through the gap between the first glue-filling area (31) and the second glue-filling area (32), cooling the end winding of the cooling slot. Part of it flows into the back of the core through the ventilation hole (20) of the base partition (19), and the other part merges with the first cold air. The third cold air flows through the gap between the second glue-filling area (32) and the third glue-filling area (33), cools the middle winding and the parallel ring (16), and then flows into the back of the core; The fourth cold air passes through the radial ventilation hole (34) inside the third glue-filling area (33), cools the nose of the winding and the parallel ring (16) and then flows into the back of the core; The fifth cold air flows along the inside of the baffle plate (18), cools in a direction and then flows into the back of the core through the ventilation hole (20) after passing through the loop (16).

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