Pumped storage motor stator structure capable of reducing noise

Abstract

The application discloses a pumped storage motor stator structure capable of reducing noise, and relates to the technical field of pumped storage motor, solves the problems of looseness between stator core punching sheet laminations and stator slot wedge falling off. The first round rod is provided with a fastening structure at one end and is externally sleeved with a compression knob, and the outer side of the compression knob is sleeved with a fastening limiting shell; the compression knob comprises a gear shell body, a second boss and a first boss which are connected in sequence, the first boss is provided with a spiral hole, and the fastening structure is arranged in the spiral hole; one end of the fastening limiting shell is attached to the surface of the other end of the stator core, and the other end of the fastening limiting shell is attached to the end face of the second boss; the inner side of the fastening limiting shell is provided with a sawtooth limiting groove, a plurality of limiting teeth are arranged in the sawtooth limiting groove, and the limiting teeth are matched with the fastening structure. The application effectively fastens the stator core, reduces the gap between the punching sheet laminations, reduces noise, reduces the loss of the stator core, prevents the stator slot wedge from falling off, and prolongs the service life of the motor.

Description

Technical Field

[0001] This invention relates to the field of pumped storage motor technology, specifically to a pumped storage motor stator structure that can reduce noise. Background Technology

[0002] Pumped storage motors play a crucial role in modern power grids. With the continuous increase in unit capacity, stator core losses also increase, generating significant heat within the core and causing a substantial temperature rise. The stator core is constructed from laminated silicon steel laminations. The special insulating varnish coating on the laminations is a key barrier ensuring inter-laminar insulation, blocking eddy current paths, and reducing iron losses. Prolonged exposure to high temperatures can lead to varying degrees of localized detachment, creating small gaps or loosening between the originally tightly stacked laminations. This results in increased noise during operation and exacerbates unit vibration. Furthermore, stator slot wedges can be damaged to varying degrees during installation. Increased unit vibration can even cause stator wedge detachment, severely compromising the overall operational stability and expected lifespan of the motor. Therefore, there is an urgent need to develop a pumped storage motor stator structure that can reduce noise. Summary of the Invention

[0003] To address the aforementioned problems of loose stator core laminations and stator slot wedge detachment, this invention proposes a noise-reducing stator structure for pumped-storage motors. This invention effectively tightens the stator core, reduces the gap between laminations, lowers noise, reduces stator core wear, prevents stator slot wedge detachment, and extends motor lifespan.

[0004] This invention proposes a noise-reducing stator structure for a pumped-storage motor, specifically comprising a stator core, a fastening and limiting housing, an adjustable fastening module, and a clamping knob. The adjustable fastening module includes a fastening and limiting cylinder, a first rod, and a fastening structure. The first rod is disposed in a positioning hole in the stator core. A fastening and limiting cylinder is located at one end of the first rod, and the fastening and limiting cylinder is in contact with one end surface of the stator core. A fastening structure is located at the other end of the first rod, and a clamping knob is externally fitted onto it. The button has a fastening limiting housing on its outer side; the fastening button includes a gear housing, a second boss and a first boss connected in sequence, the first boss is provided with a spiral hole, and the fastening structure is provided in the spiral hole; one end of the fastening limiting housing is in contact with the surface of the other end of the stator core, and the other end of the fastening limiting housing is in contact with the end face of the second boss; a serrated limiting groove is provided on the inner side of the fastening limiting housing, and a number of limiting teeth are provided in the serrated limiting groove, the limiting teeth and the fastening structure are engaged.

[0005] Furthermore, the fastening structure includes a second spring, a stepping fastening plate, and a bracket. The bracket is mounted on the first round rod, and the stepping fastening plate is rotatably mounted on the bracket. The upper end of the second spring is connected to one end of the stepping fastening plate, and the lower end is connected to the first round rod. The raised end of the stepping fastening plate rests against the limiting tooth.

[0006] Furthermore, it also includes a first spring and an anti-rotation housing, with the anti-rotation housing slidably sleeved on the outside of the gear housing, and the fastening limiting housing, the first spring, and the anti-rotation housing connected in sequence.

[0007] Furthermore, the first spring has a left-hand rotation.

[0008] Furthermore, the anti-rotation housing and the gear housing mesh.

[0009] Furthermore, the length of the second boss is the same as the length of the first spring in its natural state.

[0010] Furthermore, the stator core includes a stator yoke and a plurality of stator teeth, the stator teeth being equidistantly arranged in the inner ring of the stator yoke, and stator windings and composite hexagonal slot wedges being arranged in the stator slots between the stator teeth.

[0011] Furthermore, the stator slot wall is provided with a groove, into which a composite hexagonal slot wedge is inserted.

[0012] Furthermore, the composite hexagonal groove wedge is provided with ventilation holes, which are trapezoidal in shape.

[0013] Furthermore, the composite hexagonal slot wedge is made of a magnetically conductive material.

[0014] The beneficial effects of the noise-reducing stator structure of the pumped storage motor described in this invention are as follows: (1) The pumped storage motor stator structure that can reduce noise according to the present invention forms a one-way locking structure by means of an adjustable fastening module and a fastening limiting shell. Under the action of the pressing knob, the pressing knob pulls the adjustable fastening module through the spiral hole, so that the stepping fastening plate on the first round rod slides in the sawtooth limiting groove and presses against the limiting tooth, thereby reducing the gap between the laminations and locking, thereby reducing the noise generated by the vibration of the stator core.

[0015] (2) The stator structure of the pumped storage motor that can reduce noise described in this invention has a groove on the side wall of the stator slot, and a composite hexagonal slot wedge is embedded in the groove to prevent the slot wedge from falling off; at the same time, a trapezoidal ventilation hole is provided on the composite hexagonal slot wedge, and the long side of the ventilation hole expands a lot after being heated, which further ensures the fixing effect of the composite hexagonal slot wedge during operation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, 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 improper limitation of the invention.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 2 The present invention relates to a noise-reducing stator structure for a pumped-storage motor. Figure 1 A magnified view of a section at point I; Figure 3 This is a schematic diagram of the stator core of a pumped storage motor stator structure that can reduce noise, as described in this invention. Figure 4 The present invention relates to a noise-reducing stator structure for a pumped-storage motor. Figure 2 Enlarged view of a section at point II; Figure 5 The present invention relates to a noise-reducing stator structure for a pumped-storage motor. Figure 1 Cross-sectional view at point AA; Figure 6 The present invention relates to a noise-reducing stator structure for a pumped-storage motor. Figure 5 A magnified view of a section at point III; Figure 7 This is a rear view of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 8 This is a schematic diagram of the adjustable fastening module of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 9 The present invention relates to a noise-reducing stator structure for a pumped-storage motor. Figure 8 A magnified view of a section at point IV in the middle; Figure 10 This is a schematic diagram of the stepper fastening plate of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 11 This is a schematic diagram of the first support structure of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 12 This is a schematic diagram of the second support structure of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 13 This is a schematic diagram of the anti-rotation housing of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 14This is a schematic diagram of the clamping knob of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 15 This is a schematic diagram of the composite hexagonal slot wedge structure of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Figure 16 This is a schematic diagram of the fastening and limiting housing of the stator structure of a pumped storage motor that can reduce noise, as described in this invention. Wherein: 1-Stator core; 2-Stator tooth; 3-Stator yoke; 4-Positioning hole; 5-Fastening and limiting housing; 6-Stator winding; 7-Composite hexagonal slot wedge; 8-Anti-rotation housing; 9-Adjustable fastening module; 10-Pressure knob; 11-Ventilation hole; 12-Fastening and limiting cylinder; 13-First round rod; 14-First spring; 15-Second spring; 16-Stepping fastening plate; 17-First bracket; 18-Second bracket; 19-Second round rod; 20-First circular through hole; 21-Second circular through hole; 22-Third through hole; 23-Gear housing; 24-Second boss; 25-First boss; 26-Helical hole; 27-Fourth circular through hole; 28-Serrated limiting groove; 29-Fifth through hole. Detailed Implementation

[0018] 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 described in the embodiments of the present invention can be combined with each other. The described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Specific implementation method one: See Figures 1-16 This embodiment is described in detail. The stator structure of a pumped-storage motor that reduces noise, as described in this embodiment, specifically includes a stator core 1, a fastening and limiting housing 5, an adjustable fastening module 9, and a clamping knob 10. The adjustable fastening module 9 includes a fastening and limiting cylinder 12, a first round rod 13, and a fastening structure. The first round rod 13 is disposed in a positioning hole 4 in the stator core 1, and the number of positioning holes 4 is thirty-six. A fastening and limiting cylinder 12 is disposed at one end of the first round rod 13, and the fastening and limiting cylinder 12 is in contact with one end surface of the stator core 1. A fastening structure is disposed at the other end of the first round rod 13, and a clamping knob 10 is sleeved on its outside. A fastening and limiting housing 5 is sleeved on the outside of the clamping knob 10. The distance between the fastening structure and the right end face of the first round rod 13 is 50 mm.

[0020] The clamping knob 10 includes a gear housing 23, a second boss 24, and a first boss 25 connected in sequence. The diameter of the gear housing 23 is larger than the diameter of the second boss 24, and the diameter of the second boss 24 is larger than the diameter of the first boss 25, forming a stepped shape. The axial length of the first boss 25 is equal to the axial length of the fastening and limiting housing 5. A spiral hole 26 is provided on the first boss 25, and the spiral hole 26 rotates clockwise on the first boss 25. The end of the first round rod 13 passes through the positioning hole 4 and is inserted into the fourth circular through hole 27 of the first boss 25 to form a clearance fit. The positioning hole 4 and the fourth circular through hole 27 have the same diameter. The spiral hole 26 and the fourth circular through hole 27 are connected, and the fastening structure is provided in the spiral hole 26.

[0021] One end of the fastening limiting housing 5 is attached to the surface of the other end of the stator core 1, and the other end of the fastening limiting housing 5 is attached to the end face of the second boss 24; the inner side of the fastening limiting housing 5 is provided with a serrated limiting groove 28 and a fifth through hole 29, the first boss 25 is inserted into the fifth through hole 29, and a number of limiting teeth are provided in the serrated limiting groove 28, which cooperate with the fastening structure; one side of the limiting tooth is vertical, and the other side is an inclined surface, with the inclined surface lower on the left and higher on the right, such as Figure 6 As shown.

[0022] The fastening structure includes a second spring 15, a stepping fastening plate 16, and a bracket. The bracket is mounted on the first round rod 13, and the stepping fastening plate 16 is rotatably mounted on the bracket. The upper end of the second spring 15 is connected to the left end of the stepping fastening plate 16, and the lower end is connected to the first round rod 13. Under the action of the second spring 15, one end of the stepping fastening plate 16 is raised. The raised left end of the stepping fastening plate 16 abuts against the limiting teeth, forming a one-way locking structure, and the right end abuts against the outer surface of the first round rod 13 in the radial direction. By setting the sawtooth limiting groove 28, the stepping fastening plate 16 can only move to the right in the axial direction, preventing the stator core 1 from loosening.

[0023] The bracket includes a first bracket 17, a second bracket 18, and a second round rod 19. The first bracket 17 and the second bracket 18 are symmetrically arranged on the first round rod 13. The upper end of the first bracket 17 is provided with a first circular through hole 20, and the stepping fastening plate 16 is provided with a second circular through hole 21. One end of the second round rod 19 passes through the first circular through hole 20 and the second circular through hole 21 and is connected to the second bracket 18 by welding. The stepping fastening plate 16 can rotate about the second round rod 19 as an axis. The width of the spiral hole 26 is greater than the projection of the length of the stepping fastening plate 16 in the axial direction, and the width of the stepping fastening plate 16 is less than the width of the serrated limiting groove 28. The length of the second round rod 19 is equal to the sum of the lengths of the first circular through hole 20 and the second circular through hole 21. The diameters of the first circular through hole 20 and the second circular through hole 21 are the same, and the second round rod 19 forms a clearance fit with the first circular through hole 20 and the second circular through hole 21. The surface of the second round rod 19 is coated with lubricant.

[0024] A first spring 14 and an anti-rotation housing 8 are fitted onto the clamping knob 10. The anti-rotation housing 8 is slidably fitted onto the outside of the gear housing 23. The gear housing 23 is inserted into the third through hole 22 of the anti-rotation housing 8. The fastening limiting housing 5, the first spring 14, and the anti-rotation housing 8 are connected in sequence by welding. The first spring 14 rotates counterclockwise. The gear housing 23 is inserted into the fourth through hole 22 on the anti-rotation housing 8 and meshes with the anti-rotation housing 8, forming a clearance fit to prevent the gear housing 23 from rotating clockwise during motor operation, which helps the anti-rotation housing 8 to lock the gear housing 23. The gear housing 23 has eighteen teeth, increasing the friction when manually rotating the gear housing 23, which helps to tighten the fixing core 1. The length of the second boss 24 is the same as the length of the first spring 14 in its natural state; the sum of the length of the first spring 14 in its extreme compression state and the axial length of the anti-rotation housing 8 is equal to the length of the second boss 24; when the anti-rotation housing 8 is compressed by the first spring 14 by the axial force, the anti-rotation housing 8 can be separated from the gear housing 23, and the gear housing 23 can rotate counterclockwise.

[0025] The stator core 1 includes a stator yoke 3 and seventy-eight stator teeth 2. The stator teeth 2 are equidistantly arranged in the inner ring of the stator yoke 3. A stator winding 6 and a composite hexagonal slot wedge 7 are arranged in the stator slot formed between two adjacent stator teeth 2. The stator winding 6 is arranged at the bottom of the stator slot, and the composite hexagonal slot wedge 7 is arranged at the opening of the stator slot.

[0026] Each of the two stator slots has two connected V-shaped grooves on its two sides. The composite hexagonal slot wedge 7 is inserted into these grooves to form a tight fit, effectively preventing the composite hexagonal slot wedge 7 from falling off during motor operation due to varying degrees of wear during installation. The composite hexagonal slot wedge 7 has a trapezoidal ventilation hole 11, which effectively reduces the temperature of the composite hexagonal slot wedge 7 during motor operation. The lower side of the ventilation hole 11 is the long side of the trapezoid, and the center of the trapezoid is located at one-quarter of the radial height of the composite hexagonal slot wedge 7. Utilizing the large expansion of the long side of the trapezoidal ventilation hole 11 when heated, it further facilitates the fixation of the composite hexagonal slot wedge 7 during operation. The composite hexagonal slot wedge 7 is made of a magnetically conductive material, which allows for a more uniform distribution of magnetic flux in the air gap, reducing stator core losses, lowering motor noise and vibration, and extending the motor's service life.

[0027] The specific working process of the noise-reducing stator structure of the pumped storage motor described in this invention is as follows: The anti-rotation housing 8 is pressed along the axial direction, compressing the first spring 14. The clamping knob 10 is rotated counterclockwise, causing the stepping fastening plate 16 to move within the spiral hole 26. The stepping fastening plate 16 passes through the limiting teeth in the sawtooth limiting groove 28 once, compressing and springing back the second spring 15 once. At the same time, it drives the first round rod 13 and the fastening limiting cylinder 12 to move to the right, continuously pressing the stator core 1. After the clamping knob 10 stops rotating, the first round rod 13 and the fastening limiting cylinder 12 do not move. The anti-rotation housing 8 is released, and the first spring 14 springs back.

[0028] In summary, the pumped storage motor stator structure of the present invention, which can reduce noise, forms a one-way locking structure through the cooperation of the adjustable fastening module 9 and the fastening limiting housing 5. Under the action of the pressing knob 10, the pressing knob 10 pulls the adjustable fastening module 9 through the spiral hole 26, so that the stepping fastening plate 16 on the first round rod 13 slides in the sawtooth limiting groove 28 and presses against the limiting teeth, thereby reducing the gap between the laminations and locking them, thereby reducing the noise generated by the vibration of the stator core 1.

[0029] The present invention discloses a noise-reducing stator structure for a pumped storage motor. A groove is provided on the side wall of the stator slot, and a composite hexagonal slot wedge 7 is embedded in the groove to prevent the slot wedge from falling off. At the same time, a trapezoidal ventilation hole 11 is provided on the composite hexagonal slot wedge 7. Taking advantage of the large expansion of the long side of the ventilation hole 11 after being heated, the fixing effect of the composite hexagonal slot wedge 7 is further guaranteed during operation.

[0030] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the invention. They can also be reasonable combinations of the features described in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stator structure for a pumped-storage motor that reduces noise, characterized in that: The device includes a stator core (1), a fastening and limiting housing (5), an adjustable fastening module (9), and a clamping knob (10). The adjustable fastening module (9) includes a fastening and limiting cylinder (12), a first round rod (13), and a fastening structure. The first round rod (13) is located in the positioning hole (4) of the stator core (1). One end of the first round rod (13) is provided with a fastening and limiting cylinder (12), and the fastening and limiting cylinder (12) and one end of the stator core (1) are in contact. The other end of the first round rod (13) is provided with a fastening structure and is externally fitted with a clamping knob (10). The clamping knob (10) is externally fitted with a clamping structure. The fastening limiting housing (5) includes a gear housing (23), a second boss (24) and a first boss (25) connected in sequence. A spiral hole (26) is provided on the first boss (25), and the fastening structure is provided in the spiral hole (26). One end of the fastening limiting housing (5) is in contact with the surface of the other end of the stator core (1), and the other end of the fastening limiting housing (5) is in contact with the end face of the second boss (24). A serrated limiting groove (28) is provided on the inner side of the fastening limiting housing (5), and a number of limiting teeth are provided in the serrated limiting groove (28), which cooperate with the fastening structure.

2. The pumped storage motor stator structure with noise reduction capability according to claim 1, characterized in that: The fastening structure includes a second spring (15), a step fastening plate (16), and a bracket. The bracket is mounted on the first round rod (13), and the step fastening plate (16) is rotatably mounted on the bracket. The upper end of the second spring (15) is connected to one end of the step fastening plate (16), and the lower end is connected to the first round rod (13). The raised end of the step fastening plate (16) rests on the limiting tooth.

3. The pumped-storage motor stator structure with noise reduction capability according to claim 1, characterized in that: It also includes a first spring (14) and an anti-rotation housing (8). The anti-rotation housing (8) is slidably sleeved on the outside of the gear housing (23). The fastening limiting housing (5), the first spring (14) and the anti-rotation housing (8) are connected in sequence.

4. The pumped-storage motor stator structure with noise reduction according to claim 3, characterized in that: The first spring (14) rotates to the left.

5. The pumped-storage motor stator structure with noise reduction according to claim 3, characterized in that: The anti-rotation housing (8) and the gear housing (23) mesh.

6. The pumped-storage motor stator structure with noise reduction according to claim 3, characterized in that: The length of the second boss (24) is the same as the length of the first spring (14) in its natural state.

7. The pumped-storage motor stator structure with noise reduction according to claim 1, characterized in that: The stator core (1) includes a stator yoke (3) and several stator teeth (2). The stator teeth (2) are equidistantly arranged in the inner ring of the stator yoke (3). The stator slots between the stator teeth (2) are provided with stator windings (6) and composite hexagonal slot wedges (7).

8. The noise-reducing stator structure of a pumped-storage motor according to claim 7, characterized in that: The stator slot wall is provided with a groove, and the composite hexagonal slot wedge (7) is inserted into the groove.

9. The pumped-storage motor stator structure with noise reduction according to claim 7, characterized in that: The composite hexagonal groove wedge (7) is provided with ventilation holes (11), which are trapezoidal in shape.

10. The pumped-storage motor stator structure with noise reduction according to claim 7, characterized in that: The composite hexagonal slot wedge (7) is made of magnetic material.

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