Fastening ultrahigh-voltage motor stator core structure
By designing a fastened stator core structure in an ultra-high voltage motor, using components such as cooling system and limiting pressure ring, the problems of high temperature and increased noise of the stator core are solved, achieving more efficient motor operation and longer service life.
Patent Information
- Application Number
- CN202411846100.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-28
AI Technical Summary
During normal operation of ultra-high voltage motors, due to the high voltage level, the core loss of the stator punching plate is significantly increased, resulting in high temperature of the stator core, falling off the insulating paint film, loosening of the stator core, increasing noise and vibration, seriously affecting the service life and operating efficiency of the motor.
A tightened ultra-high voltage motor stator core structure is adopted, and a tight cooling and fixing system is formed through components such as cooler, coolant input and output hose, limit pressure ring, elastic limit screw, ring cover plate and core pressure ring, which effectively reduces the temperature and noise of the stator core.
It achieves simple assembly and convenient maintenance, effectively reduces the temperature of the stator core, reduces noise and vibration, extends service life and improves operating efficiency.
Smart Images
Figure CN119727175A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of ultra-high voltage motors, and in particular to a structure for fastening an ultra-high voltage motor stator core. Background Art
[0002] Ultra-high voltage motors have attracted more and more attention in recent years because they eliminate the need for transformers and save floor space. However, during normal operation of this type of motor, due to the high voltage level, the core loss of the stator punchings increases significantly, resulting in high temperature of the stator punchings. The insulating paint film on the surface of the stator punchings is affected by the temperature and will fall off to varying degrees at different positions. As the operating time increases, the shedding of the insulating paint film gradually intensifies, and the stator core becomes loose, resulting in increased noise and vibration when the motor is running, seriously affecting the service life and operating efficiency of the motor. Therefore, in order to address the above-mentioned deficiencies, it is urgently necessary to develop a structure for tightening the stator core of an ultra-high voltage motor. Summary of the invention
[0003] In view of this, the present invention provides a fastened ultra-high voltage motor stator core structure with the characteristics of simple assembly, convenient installation, and convenient maintenance.
[0004] The technical scheme of the present invention is: a structure for fastening the stator core of an ultra-high voltage motor, which is composed of a cooler, a coolant input hose, a coolant output hose, a limit pressure ring, an outer loose limit screw end, an inner loose limit screw end, a front convex ring cover plate, a core pressure ring, a stator base, a stator core, an inner loose limit screw, an outer loose limit screw, a rear convex ring cover plate, and a push top ring;
[0005] The inner tightening and limiting screws and the outer tightening and limiting screws are uniformly distributed in the circumferential direction for 48 pieces, and the inner tightening and limiting screws are located on the inner side of the outer tightening and limiting screws in the radial direction;
[0006] The cooler, the front convex ring cover plate and the rear convex ring cover plate are all welded to the inner wall of the stator frame.
[0007] A core pressing ring is placed closely on both axial sides of the stator core, and a limit pressing ring is placed closely on the outer side of the core pressing ring in the axial direction;
[0008] The limit pressure ring has an outer loose and tight limit screw through hole, an inner loose and tight limit screw threaded hole, an outer ring through hole, and a limit pressure ring ring groove, and the limit pressure ring ring groove is located on the outside of the limit pressure ring in the axial direction; the front convex ring cover plate has a front cover flat plate, a positioning convex ring, and a loose and tight limit screw through hole, and the positioning convex ring is tightly placed on the outside of the limit pressure ring groove in the axial direction to form an extrusion fit therewith;
[0009] The rear convex ring cover plate comprises a rear cover flat plate and a positioning convex ring, wherein the positioning convex ring is placed closely on the outer side of the ring groove of the pressing ring in the axial direction to form an extrusion fit therewith;
[0010] The outer looseness limiting screw through hole is connected to the outer ring through hole;
[0011] The coolers are respectively located outside the front convex ring cover plate and the rear convex ring cover plate in the axial direction; the coolers are respectively connected to the coolant input hose and the coolant output hose;
[0012] The core pressing ring has an outer looseness limiting screw positioning through hole, an inner looseness limiting screw positioning through hole, a core pressing ring inlet flow channel, and a core pressing ring outlet flow channel;
[0013] The coolant input hose is connected to the inlet flow channel of the core pressing ring, and the coolant output hose is connected to the outlet flow channel of the core pressing ring;
[0014] The push top ring has an internal threaded hole, and the push top ring is located in the through hole of the outer ring;
[0015] The inner tension limiting screw passes through the inner tension limiting screw positioning through hole and the stator core, and forms a threaded fit with the inner tension limiting screw threaded holes on both sides of the axial direction;
[0016] The inner tension limiting screw is welded to the end of the inner tension limiting screw near the top of the front convex ring cover plate in the axial direction;
[0017] The outer tension limiting screw passes through the outer tension limiting screw positioning through hole, the stator core and the tension limiting screw through hole, and forms a threaded fit with the push top rings on both sides of the axial direction;
[0018] The outer tension limiting screw is located near the top end of the front convex ring cover plate and is welded to the end of the outer tension limiting screw.
[0019] In the above-mentioned structure for fastening the stator core of the ultra-high voltage motor, the outer diameters of the stator core, the front convex ring cover plate, the rear convex ring cover plate, and the core pressing ring are the same as the inner wall diameter of the stator base.
[0020] In the above-mentioned structure for fastening the stator core of an ultra-high voltage motor, the inner tightening and limiting screw has an inner tightening and limiting screw thread, and the spiral tracks of the inner tightening and limiting screw thread at two ends in the axial direction are opposite.
[0021] In the above-mentioned structure for tightening the stator core of an ultra-high voltage motor, the external tightening and limiting screw has an external tightening and limiting screw thread, the spiral trajectories of the external tightening and limiting screw threads at both ends of the axial direction are opposite, and the internal tightening and limiting screw thread is opposite to the external tightening and limiting screw thread on the same side of the axial direction.
[0022] In the above-mentioned structure for tightening the stator core of the ultra-high voltage motor, the inner tension limit screw and the outer tension limit screw have the same axial length, one end of the outer tension limit screw in the axial direction extends out of the adjacent limit pressure ring by 60 mm, and is 20 mm away from the inner side of the axial direction of the rear cover plate, and the other end of the outer tension limit screw in the axial direction is 30 mm away from the outer side of the axial direction of the front cover plate, one end of the inner tension limit screw in the axial direction extends out of the adjacent limit pressure ring by 60 mm, and is 20 mm away from the inner side of the axial direction of the rear cover plate, and the other end of the inner tension limit screw in the axial direction is 30 mm away from the outer side of the axial direction of the front cover plate.
[0023] In the above-mentioned structure for tightening the stator core of the ultra-high voltage motor, 16 core pressing rings are evenly distributed along the circumferential direction, wherein each core pressing ring has three outer tension limiting screw through holes and three inner tension limiting screw threaded holes, and the core pressing rings are spaced 20 mm apart.
[0024] In the above-mentioned structure for tightening the stator core of the ultra-high voltage motor, the limiting pressure ring groove is located between the outer tension limiting screw through hole and the inner tension limiting screw threaded hole in the radial direction, the axial top diameter of the positioning convex ring is twice the diameter of the limiting pressure ring groove, and the diameter of the limiting pressure ring is 20 mm less than the inner wall diameter of the stator base.
[0025] In the above-mentioned structure for tightening the stator core of the ultra-high voltage motor, the outer tension limit screw positioning through hole, the outer tension limit screw through hole, the tension limit screw through hole, and the internal threaded hole are evenly distributed along the circumference, totaling 48 in number, and are consistent in the axial direction; the inner tension limit screw positioning through hole and the inner tension limit screw threaded hole are evenly distributed along the circumference, totaling 48 in number, and are consistent in the axial direction.
[0026] In the above-mentioned fastened ultra-high voltage motor stator core structure, the core pressing ring has several types of flow channels, which are located on the inner side of the core pressing ring in the radial direction, 47 of which are evenly distributed along the circumferential direction and are all connected, and are connected to the core pressing ring inlet flow channel and the core pressing ring outlet flow channel.
[0027] In the above-mentioned structure for fastening the stator core of an ultra-high voltage motor, the core pressing ring is made of 06Cr19Ni10 and the coolant is liquid nitrogen.
[0028] Compared with the prior art, the present invention has the following beneficial effects:
[0029] 1. The present invention is simple to assemble and convenient for later maintenance.
[0030] 2. The present invention effectively reduces the temperature of the stator core.
[0031] 3. The present invention effectively reduces the noise and vibration of the ultra-high voltage motor during operation.
[0032] 4. The present invention can dynamically adjust the compression degree of the stator core. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] The following is a brief introduction to the drawings required for use in the embodiments of the present invention.
[0034] Figure 1 The present invention is a front view of a structure for fastening the stator core of an ultra-high voltage motor.
[0035] Figure 2 This is an AA cross-sectional view of a fastened ultra-high voltage motor stator core structure.
[0036] Figure 3 This is a local enlarged view of point I.
[0037] Figure 4 This is a local enlarged view of point II.
[0038] Figure 5 This is a BB view of a fastened ultra-high voltage motor stator core structure.
[0039] Figure 6 This is the two-dimensional front view of the core pressing ring part.
[0040] Figure 7 This is a local enlarged view of point III.
[0041] Figure 8 This is the two-dimensional front view of the limit pressure ring part.
[0042] Fig. 9 It is the AA section view of the limit pressure ring.
[0043] Fig.10 This is the AA cross-sectional view of the inner tension limit screw.
[0044] Fig.11 This is the AA cross-sectional view of the external tension limit screw.
[0045] Fig.12 This is the AA section view of the front convex ring cover part.
[0046] Fig.13 This is the AA section view of the rear convex ring cover part.
[0047] Fig.14 To promote the top ring parts diagram.
[0048] Fig.15 This is a front view of the coolant flow path diagram.
[0049] Fig.16 This is the coolant flow path diagram of the BB view.
[0050] Description of the standard parts in the figure: 1-cooler; 2-coolant input hose; 3-coolant output hose; 4-limiting pressure ring; 5-external tension limiting screw end; 6-internal tension limiting screw end; 7-front convex ring cover; 8-core pressure ring; 9-statator base; 10-statator core; 11-internal tension limiting screw; 12-external tension limiting screw; 13-rear convex ring cover; 14-propelling top ring; 15-several flow channels; 16-external tension limiting screw positioning hole ; 17-Internal tension limit screw positioning through hole; 18-Core pressure ring inlet flow channel; 19-Core pressure ring outlet flow channel; 20-External tension limit screw through hole; 21-Internal tension limit screw threaded hole; 22-Outer ring through hole; 23-Internal tension limit screw thread; 24-External tension limit screw thread; 25-Tightness limit screw through hole; 26-Internal threaded hole; 27-Limiting pressure ring ring groove; 28-Front cover plate; 29-Positioning convex ring; 30-Rear cover plate. DETAILED DESCRIPTION
[0051] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, further explanation will be given below in conjunction with the accompanying drawings and specific embodiments, but each embodiment does not constitute a limitation of the present invention. The specific embodiments described in the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0052] like Figures 1 to 16 As shown, a structure for fastening the stator core of an ultra-high voltage motor comprises a cooler 1, a coolant input hose 2, a coolant output hose 3, a limit pressing ring 4, an outer tightness limit screw end 5, an inner tightness limit screw end 6, a front convex ring cover 7, a core pressing ring 8, a stator base 9, a stator core 10, an inner tightness limit screw 11, an outer tightness limit screw 12, a rear convex ring cover 13, and a push top ring 14;
[0053] The inner tightening and limiting screws 11 and the outer tightening and limiting screws 12 are uniformly distributed in the circumferential direction, and the inner tightening and limiting screws 11 are located on the inner side of the outer tightening and limiting screws 12 in the radial direction.
[0054] The cooler 1, the front convex ring cover plate 7, and the rear convex ring cover plate 13 are all welded to the inner wall of the stator frame 9.
[0055] The stator core 10 is provided with a core pressing ring 8 on both axial sides thereof, and a limiting pressing ring 4 is provided on the outer side of the core pressing ring 8 in the axial direction thereof.
[0056] The limiting pressure ring 4 has an outer looseness limiting screw through hole 20, an inner looseness limiting screw threaded hole 21, an outer ring through hole 22, and a limiting pressure ring ring groove 27. The limiting pressure ring ring groove 27 is located outside the limiting pressure ring 4 in the axial direction.
[0057] The front convex ring cover plate 7 comprises a front cover plate 28, a positioning convex ring 29, and a tension limiting screw through hole 25. The positioning convex ring 29 is placed closely on the outer side of the limiting pressure ring groove 27 in the axial direction to form an extrusion fit therewith.
[0058] The rear convex ring cover plate 7 comprises a rear cover flat plate 30 and a positioning convex ring 29. The positioning convex ring 29 is placed closely on the outer side of the pressure ring groove 27 in the axial direction to form an extrusion fit therewith.
[0059] The outer looseness limiting screw through hole 20 is connected to the outer ring through hole 22.
[0060] The cooler 1 is located on the axial outer side of the front convex ring cover plate 7 and the rear convex ring cover plate 13.
[0061] The cooler 1 is connected to the coolant input hose 2 and the coolant output hose 3 respectively.
[0062] The core pressing ring 8 has an outer looseness limiting screw positioning through hole 16, an inner looseness limiting screw positioning through hole 17, a core pressing ring inlet flow channel 18, and a core pressing ring outlet flow channel 20.
[0063] The coolant input hose 2 is connected to the core pressing ring inlet flow channel 18, and the coolant output hose 3 is connected to the core pressing ring outlet flow channel 20.
[0064] The push top ring 14 has an internal threaded hole 26, and the push top ring 14 is located in the outer ring through hole 22.
[0065] The inner tension limiting screw 11 passes through the inner tension limiting screw positioning through hole 17 and the stator core 10, and forms a threaded fit with the inner tension limiting screw threaded holes 21 on both sides of the axial direction.
[0066] The inner tension limiting screw 11 is welded to the inner tension limiting screw end 6 near the top of the front convex ring cover plate 7 in the axial direction.
[0067] The outer tension limiting screw 12 passes through the outer tension limiting screw positioning through hole 16, the stator core 10 and the tension limiting screw through hole 25, and forms a threaded fit with the push top ring 14 on both sides of the axial direction.
[0068] The outer tightness limiting screw 12 is located near the top of the front convex ring cover plate 7 and welded to the outer tightness limiting screw end 5. The structure has few components, simple assembly, and convenient later maintenance.
[0069] like Figures 2 to 4As shown, the outer diameters of the stator core 10, the front convex ring cover plate 7, the rear convex ring cover plate 13, and the core pressing ring 8 are the same as the inner wall diameter of the stator base 9. This is conducive to the installation and fixation of the stator core, and reduces the gravity borne by the inner tightening and limiting screw 11 and the outer tightening and limiting screw 12, thereby extending the service life of the inner tightening and limiting screw 11 and the outer tightening and limiting screw 12.
[0070] like Fig.10 As shown, the inner tension limiting screw 11 has an inner tension limiting screw thread 23, and the spiral tracks of the inner tension limiting screw threads 23 at both ends of the axial direction are opposite. When the inner tension limiting screw end 6 is rotated, the limiting pressure ring 4 can be translated toward the stator core 10 in the axial direction through the rotation of the inner tension limiting screw thread 23, and the adjacent core pressure ring 8 is squeezed, so that the stator core 10 is compressed, effectively reducing noise and vibration.
[0071] like Fig.11 As shown, the outer tension limiting screw 12 has an outer tension limiting screw thread 24, and the spiral trajectories of the outer tension limiting screw thread 24 at both ends of the axial direction are opposite. When the outer tension limiting screw end 5 is rotated, the top ring 14 can be pushed through the rotation of the outer tension limiting screw thread 24, and the translation in the axial direction away from the direction of the stator core 10 occurs, so that the limiting pressure ring 4 is close to the stator base 9 side and has strong conduction. Due to the extrusion fit between the front convex ring cover plate 7 and the rear convex ring cover plate 13 and the limiting pressure ring groove 27, the force is effectively transmitted to the core pressure ring 8, so that the stator core 10 is compressed, effectively reducing noise and vibration. The inner tension limiting screw thread 23 is opposite to the outer tension limiting screw thread 24 on the same side in the axial direction. The same rotation direction is used during adjustment, which is conducive to operation.
[0072] like Figures 2 to 4 As shown, the inner tension limiting screw 11 and the outer tension limiting screw 12 have the same axial length, one end of the outer tension limiting screw 12 extends out of the adjacent limiting pressure ring 460mm in the axial direction, and is 20mm away from the inner side of the rear cover plate 30 in the axial direction, and the other end of the outer tension limiting screw 12 is 30mm away from the outer side of the front cover plate 28 in the axial direction, one end of the inner tension limiting screw 11 extends out of the adjacent limiting pressure ring 460mm in the axial direction, and is 20mm away from the inner side of the rear cover plate 30 in the axial direction, and the other end of the inner tension limiting screw 11 is 30mm away from the outer side of the front cover plate 28 in the axial direction. The inner tension limiting screw 11 and the outer tension limiting screw 12 are prevented from having structural interference with the rear convex ring cover plate 13, and at the same time extend a certain distance from the front convex ring cover plate 7, so that when the insulating paint film falls off, it can be rotated and adjusted at any time to compensate for the dimensional change in the axial length of the stator core.
[0073] like Figure 1 , 5As shown in FIG. 8 , 16 core pressing rings 8 are evenly distributed along the circumferential direction, wherein each core pressing ring 8 has three outer loosening and tightening limit screw through holes 20 and three inner loosening and tightening limit screw threaded holes 21, and the core pressing rings 8 are spaced 20 mm apart from each other. This is conducive to the clamping operation of the stator core at different positions, and the block structure is adopted to effectively reduce the loss of the core pressing ring 8, and a gap is left to further improve the heat dissipation capacity of the core pressing ring 8.
[0074] like Figures 2 to 4 As shown, the ring groove 27 of the limiting pressure ring is located between the outer loose and tight limiting screw through hole 20 and the inner loose and tight limiting screw threaded hole 21 in the radial direction, which is conducive to the cooperation with the positioning convex ring 29, so that the positioning convex ring 29 forms a fulcrum, and the axial force generated on the radial outer side of the limiting pressure ring 4 is transmitted to the radial inner side of the limiting pressure ring 4. It also plays a positioning role for the limiting pressure ring 4. The axial top diameter of the positioning convex ring 29 is twice the diameter of the ring groove 27 of the limiting pressure ring, and the diameter of the limiting pressure ring 4 is 20mm less than the inner wall diameter of the stator frame 9. It is conducive to the relative rotation between the limiting pressure ring 4 and the positioning convex ring 29.
[0075] like Figure 2 , 6 As shown in , 8, 9, 13, and 14, the outer tension limit screw positioning through hole 16, the outer tension limit screw through hole 20, the tension limit screw through hole 25, and the internal threaded hole 26 are evenly distributed along the circumference, a total of 48, and are consistent in the axial direction, which is convenient for the installation of the outer tension limit screw 12. The inner tension limit screw positioning through hole 17 and the inner tension limit screw threaded hole 21 are evenly distributed along the circumference, a total of 48, and are consistent in the axial direction. It is convenient for the installation of the inner tension limit screw 11.
[0076] like Figures 6-7 As shown, the core pressing ring 8 has several types of flow channels 15, which are located on the inner side of the core pressing ring 8 in the radial direction, and are evenly distributed in the circumferential direction for 47 and are all connected, which is conducive to reducing the temperature of the inner side of the core pressing ring 8 in the radial direction. The outer side of the core pressing ring 8 in the radial direction is affected by the operating conditions and its expansion degree is greater than the inner side of the core pressing ring 8 in the radial direction, which is conducive to the compression of the stator core 10. And it is connected with the core pressing ring inlet flow channel 18 and the core pressing ring outlet flow channel 19. The circulation path of the coolant is guaranteed.
[0077] like Figures 6-7 As shown, the core pressing ring 8 is made of 06Cr19Ni10. Figures 15-16 As shown, the coolant is liquid nitrogen. The cooling capacity of liquid nitrogen is used to reduce the temperature of the core pressing ring 8, and the thermal conductivity of the core pressing ring 8 is used to effectively reduce the temperature of the stator core.
[0078] like Figures 15-16As shown, the coolant starts from the cooler 1, along the coolant input hose 2, enters the core pressing ring inlet flow channel 18, passes through the several-shaped flow channel 15 in a clockwise direction to the core pressing ring outlet flow channel 19, and the coolant output hose 3 returns to the cooler 1, forming a complete cooling circuit. In addition, the coolant input hose 2 and the coolant output hose 3 can be displaced with the core pressing ring 8 without affecting the cooling path transmission.
[0079] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.
Claims
1. A structure for fastening an ultra-high voltage motor stator core, characterized by: It is composed of a cooler (1), a coolant input hose (2), a coolant output hose (3), a limit pressing ring (4), an outer tightness limit screw end (5), an inner tightness limit screw end (6), a front convex ring cover plate (7), an iron core pressing ring (8), a stator base (9), a stator iron core (10), an inner tightness limit screw (11), an outer tightness limit screw (12), a rear convex ring cover plate (13), and a push top ring (14); The inner tightening and limiting screws (11) and the outer tightening and limiting screws (12) are uniformly distributed in a circumferential direction in a number of 48, and the inner tightening and limiting screws (11) are located radially inward of the outer tightening and limiting screws (12); The cooler (1), the front convex ring cover plate (7), and the rear convex ring cover plate (13) are all welded to the inner wall of the stator frame (9); An iron core pressing ring (8) is placed closely on both axial sides of the stator iron core (10), and a limiting pressing ring (4) is placed closely on the outer side of the iron core pressing ring (8) in the axial direction; The limiting pressure ring (4) comprises an outer looseness limiting screw through hole (20), an inner looseness limiting screw threaded hole (21), an outer ring through hole (22), and a limiting pressure ring ring groove (27), wherein the limiting pressure ring ring groove (27) is located outside the limiting pressure ring (4) in the axial direction; The front convex ring cover plate (7) comprises a front cover plate (28), a positioning convex ring (29), and a loosening and tightening limit screw through hole (25); the positioning convex ring (29) is placed closely on the outer side of the limit pressure ring groove (27) in the axial direction to form an extrusion fit therewith; The rear convex ring cover plate (7) comprises a rear cover flat plate (30) and a positioning convex ring (29), wherein the positioning convex ring (29) is placed closely on the outer side of the pressure ring groove (27) in the axial direction to form an extrusion fit therewith; The outer loosening and tightening limit screw through hole (20) is connected to the outer ring through hole (22), the cooler (1) is respectively located on the axial outer side of the front convex ring cover plate (7) and the rear convex ring cover plate (13), and the cooler (1) is respectively connected to the coolant input hose (2) and the coolant output hose (3); The core pressing ring (8) has an outer looseness limiting screw positioning through hole (16), an inner looseness limiting screw positioning through hole (17), a core pressing ring inlet flow channel (18), and a core pressing ring outlet flow channel (20); The coolant input hose (2) is connected to the core pressing ring inlet flow channel (18), and the coolant output hose (3) is connected to the core pressing ring outlet flow channel (20); The push top ring (14) has an internal threaded hole (26), and the push top ring (14) is located in the outer ring through hole (22); The inner tension limiting screw (11) passes through the inner tension limiting screw positioning through hole (17) and the stator core (10), and forms a threaded fit with the inner tension limiting screw threaded holes (21) on both sides of the axial direction; The inner tension limiting screw (11) is welded to an inner tension limiting screw end (6) at the top end near the front convex ring cover plate (7) in the axial direction; The outer tension limiting screw (12) passes through the outer tension limiting screw positioning through hole (16), the stator core (10) and the tension limiting screw through hole (25), and forms a threaded fit with the pushing top ring (14) on both sides of the axial direction; The outer tightness limiting screw (12) is welded to the outer tightness limiting screw end (5) at the top end near the front convex ring cover plate (7).
2. The structure for fastening the stator core of an ultra-high voltage motor according to claim 1 is characterized in that: The outer diameters of the stator core (10), the front convex ring cover plate (7), the rear convex ring cover plate (13), and the core pressing ring (8) are the same as the inner wall diameter of the stator base (9).
3. The structure for fastening the stator core of an ultra-high voltage motor according to claim 1 is characterized in that: The inner tension limiting screw (11) has an inner tension limiting screw thread (23), and the spiral tracks of the inner tension limiting screw thread (23) at two ends in the axial direction are opposite.
4. The structure for fastening an ultra-high voltage motor stator core according to claim 1 is characterized in that: The outer tightening and limiting screw (12) has an outer tightening and limiting screw thread (24), the spiral tracks of the outer tightening and limiting screw threads (24) at two ends in the axial direction are opposite, and the inner tightening and limiting screw thread (23) is opposite to the outer tightening and limiting screw thread (24) on the same side in the axial direction.
5. The structure for fastening the stator core of an ultra-high voltage motor according to claim 1 is characterized in that: The inner tension limit screw (11) and the outer tension limit screw (12) have the same axial length. One end of the outer tension limit screw (12) extends out 60 mm from the adjacent limit pressure ring (4) in the axial direction, and is 20 mm away from the inner side of the rear cover plate (30) in the axial direction. The other end of the outer tension limit screw (12) is 30 mm away from the outer side of the front cover plate (28) in the axial direction. One end of the inner tension limit screw (11) extends out 60 mm from the adjacent limit pressure ring (4) in the axial direction, and is 20 mm away from the inner side of the rear cover plate (30) in the axial direction. The other end of the inner tension limit screw (11) is 30 mm away from the outer side of the front cover plate (28) in the axial direction.
6. The structure for fastening the stator core of an ultra-high voltage motor according to claim 2 is characterized in that: There are 16 core pressing rings (8) evenly distributed along the circumferential direction, wherein each core pressing ring (8) has three outer tightening and tightening limit screw through holes (20) and three inner tightening and tightening limit screw threaded holes (21), and the core pressing rings (8) are spaced 20 mm apart from each other.
7. The structure for fastening an ultra-high voltage motor stator core according to claim 1 is characterized in that: The limiting pressure ring groove (27) is located between the outer loosening and tightening limiting screw through hole (20) and the inner loosening and tightening limiting screw threaded hole (21) in the radial direction, the axial top diameter of the positioning protruding ring (29) is twice the diameter of the limiting pressure ring groove (27), and the diameter of the limiting pressure ring (4) is 20 mm less than the inner wall diameter of the stator base (9).
8. The structure for fastening an ultra-high voltage motor stator core according to claim 1 is characterized in that: The outer tension limiting screw positioning through hole (16), the outer tension limiting screw through hole (20), the tension limiting screw through hole (25), and the internal threaded hole (26) are evenly distributed along the circumference, and are consistent in the axial direction. The inner tension limiting screw positioning through hole (17) and the inner tension limiting screw threaded hole (21) are evenly distributed along the circumference, and are consistent in the axial direction.
9. The structure for fastening an ultra-high voltage motor stator core according to claim 1 is characterized in that: The core pressing ring (8) has several types of flow channels (15), which are located on the inner side of the core pressing ring (8) in the radial direction, are evenly distributed in 47 numbers along the circumferential direction and are all connected, and are connected to the core pressing ring inlet flow channel (18) and the core pressing ring outlet flow channel (19).
10. The structure for fastening the stator core of an ultra-high voltage motor according to claim 9, characterized in that: The core pressing ring (8) is made of 06Cr19Ni10, and the coolant is liquid nitrogen.