High-power totally-enclosed self-ventilated traction motor for high-speed motor train unit

Abstract

The application provides a high-power fully-enclosed self-ventilation traction motor for a high-speed motor train unit, a rotor support is sleeved between a motor rotating shaft and a rotor assembly, and two heat dissipation fans at a transmission end and a non-transmission end are lifted by the rotor support, the first heat dissipation fan and the second heat dissipation fan work, airflow enters an axial ventilation hole through a support ventilation hole, the airflow flows through a stator heat dissipation hole, and an outer circulation air path for heat dissipation of an inner ring of the rotor and an outer ring of the stator is formed. Meanwhile, inner blades of the first heat dissipation fan form an inner circulation air path in the motor cavity, the inner circulation air path is from the rotor assembly to corner ventilation holes at four corners of the motor, a heat exchange device is arranged in the motor cavity, airflow of the inner circulation air path is heat-exchanged and cooled, the inner side and the outer side of the motor are respectively circularly heat-dissipated through the inner circulation air path and the outer circulation air path, and the heat exchange device is used to improve the heat dissipation effect of the motor cavity and improve the heat dissipation capacity of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a high-power, fully enclosed, self-ventilated traction motor for high-speed trains. Background Technology

[0002] Traction motor integration technology, in the field of rail train structure and application, requires traction motors to have characteristics such as light weight, small size, high power density, and good vibration resistance. Therefore, the development and research of lightweight and small-sized traction motors not only has broad market prospects and substantial economic benefits, but can also promote industrial upgrading.

[0003] Traditional high-power traction motors are mostly used in the operation of rail vehicles. The motor mainly consists of a frame, stator, rotor and shaft. The stator is set on the inner wall of the frame, and the rotor is connected to the shaft for transmission. The rotor is located inside the stator. When the motor is powered on, the rotor rotates, which in turn drives the shaft to rotate. A lot of heat is generated inside the motor during operation.

[0004] In related technologies, to avoid heat accumulation and excessive temperature during the operation of high-power permanent magnet traction motors, cooling channels are often installed between the inner and outer walls of the motor base. The first radial ventilation hole of the cooling channel is located on the outer wall of the base, and the second radial ventilation hole is located at the front end of the housing along a direction parallel to the axis of rotation. A ventilation device is installed on the exterior of the motor base. During motor operation, the ventilation device drives air to enter the cooling duct through the first radial ventilation hole and exit through the second radial ventilation hole to cool the motor. However, the heat distribution inside the motor is uneven, and existing cooling methods cannot achieve uniform cooling of the entire motor. Summary of the Invention

[0005] In view of this, the present invention provides a high-power fully enclosed self-ventilated traction motor for high-speed trains to improve the heat dissipation capacity of the traction motor.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-power, fully enclosed, self-ventilated traction motor for high-speed trains includes a drive end and a corresponding non-drive end, both supporting a motor shaft. A rotor assembly is mounted on the motor shaft, and a stator core is disposed around the outer ring of the rotor assembly. The motor also includes:

[0008] The rotor support has axially arranged support ventilation holes.

[0009] The non-drive end is equipped with a first cooling fan, and the drive end is equipped with a second cooling fan. Both cooling fans are supported by the rotor bracket.

[0010] The external circulation air path is as follows: the outer blades of the first cooling fan introduce external airflow, which flows through the ventilation holes of the bracket and merges with the external airflow introduced by the second cooling fan. The airflow then flows out through the axial ventilation holes of the outer ring of the motor, and the axial ventilation holes pass through the stator heat dissipation holes of the stator core.

[0011] The internal circulation airflow path is such that the inner fan blades of the first cooling fan drive the airflow to circulate within the motor cavity;

[0012] The internal circulation airflow passes through the rotor ventilation hole on the rotor assembly and returns through the corner ventilation hole of the motor. A heat exchange device is also provided in the motor cavity to exchange heat and cool the internal airflow.

[0013] Preferably, in the above-mentioned traction motor, the internal circulation air path further includes an internal circulation air path branch provided on the motor base. The internal circulation air path branch includes the corner ventilation hole, a first radial ventilation hole that connects to the corner ventilation hole and is close to the non-drive end, and a second radial ventilation hole that connects to the drive end.

[0014] Preferably, in the above-mentioned traction motor, the heat exchange device includes a first heat pipe disposed on the end cap of the non-drive end of the motor;

[0015] And a second heat pipe disposed in the corner ventilation hole.

[0016] Preferably, in the above-mentioned traction motor, the air inlet side of the inner fan blade is arranged opposite to the rotor ventilation hole, and its exhaust side is arranged inclined upward toward the first heat pipe.

[0017] Preferably, in the above-mentioned traction motor, the evaporation end of the first heat pipe is arranged close to the air outlet of the axial ventilation hole on the external circulation air path.

[0018] Preferably, in the above-mentioned traction motor, the external circulation air path flows through the stator heat dissipation holes of the motor stator core, and the two ends of the stator heat dissipation holes are respectively connected to the transmission end and the non-transmission end;

[0019] Each of the stator heat dissipation holes includes multiple heat dissipation hole units arranged at intervals, and heat dissipation ribs are formed between two adjacent heat dissipation hole units to transfer heat.

[0020] Preferably, in the above-mentioned traction motor, the heat dissipation hole unit consists of one central heat dissipation hole unit, two inner ring heat dissipation hole units, and two outer ring heat dissipation hole units;

[0021] The two inner ring heat dissipation hole units and the central heat dissipation hole unit form an inner ring heat dissipation rib;

[0022] The two outer ring heat dissipation hole units and the inner ring heat dissipation hole unit form an outer ring heat dissipation rib;

[0023] The inner ring heat dissipation fins are arranged along the radial direction of the stator core, inclined from the inside to the outside, close to the central heat dissipation hole unit;

[0024] The outer ring heat dissipation fins extend from the inside to the outside along the radial direction of the stator core.

[0025] Preferably, in the above-mentioned traction motor, a second air inlet is provided on the second motor end cover of the transmission end, and a first buffer cavity is formed between the second motor end cover and the second cooling fan. The first buffer cavity is located between the second air inlet and the ventilation hole of the bracket.

[0026] The second motor end cover and the second cooling fan also form a second buffer cavity, which is close to the air inlet side of the axial ventilation hole.

[0027] Preferably, in the above-mentioned traction motor, the second cooling fan further includes a small fan blade located at the front end of the second air inlet and a large fan blade located at the rear end of the second air inlet;

[0028] The second cooling fan extends obliquely upward from the inner ring to the outer ring of the second motor end cover.

[0029] Preferably, in the above-mentioned traction motor, a first motor end cover is provided at the non-transmission end, and a detachable first bearing unit is arranged on the inner ring of the first motor end cover.

[0030] The first motor end cover is surrounded by a plurality of first positioning pins that can approach and move away from the first cooling fan. The protruding end of the first positioning pin is fitted with a ring structure and a first support ring that is pressed and engaged with the first cooling fan.

[0031] The inner ring of the second motor end cover is equipped with a detachable second bearing unit.

[0032] The second motor end cover is surrounded by a plurality of second positioning pins that can approach and move away from the second cooling fan. The protruding end of the second positioning pin is fitted with a ring structure and a second support ring that is pressed and engaged with the second cooling fan.

[0033] The traction motor provided by this invention includes a drive end and a non-drive end, which together support the motor shaft. A rotor assembly is mounted on the motor shaft, and a rotor support is also included, with axially arranged support ventilation holes distributed on it. A first cooling fan is installed at the non-drive end, and a second cooling fan is installed at the drive end. Both cooling fans are supported by the rotor support. An external circulation airflow path is provided, where the outer blades of the first cooling fan introduce external airflow, which flows through the support ventilation holes and merges with the external airflow introduced by the second cooling fan. The airflow then flows out through the stator cooling holes of the stator core and exits through the axial ventilation holes. An internal circulation airflow path is provided, where the inner blades of the first cooling fan drive the airflow within the motor cavity to circulate. The internal circulation airflow path flows through the rotor ventilation holes on the rotor assembly. A heat exchange device is also provided within the motor cavity to exchange heat and cool the internal airflow.

[0034] A rotor bracket is installed between the motor shaft and the rotor assembly, supporting two cooling fans at the drive end and the non-drive end. When the first and second cooling fans operate, airflow passes through the bracket's ventilation holes and enters the axial ventilation holes. The axial ventilation holes then flow through the stator cooling holes, forming an external circulation airflow path for cooling the inner ring of the rotor and the outer ring of the stator. Simultaneously, the inner blades of the first cooling fan form an internal circulation airflow path within the motor cavity, flowing from the rotor assembly to the ventilation holes at the four upper corners of the motor. A heat exchange device is installed within the motor cavity to exchange heat and cool the airflow in the internal circulation path. Through the two airflow paths—the internal and external circulation paths—the inner and outer sides of the motor are circulated for cooling, respectively. The heat exchange device further enhances the cooling effect of the motor cavity, improving the motor's heat dissipation capacity. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A cross-sectional view of the high-power fully enclosed self-ventilated traction motor for high-speed trains provided by the present invention;

[0037] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the stator core of a medium traction motor;

[0038] Figure 3 for Figure 1 A schematic diagram of the airflow direction at the second air inlet position (second positioning pin not shown) in the traction motor. Detailed Implementation

[0039] This invention discloses a high-power, fully enclosed, self-ventilated traction motor for high-speed trains, which improves the heat dissipation capacity of the traction motor.

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figures 1-3 As shown, Figure 1 A cross-sectional view of the high-power fully enclosed self-ventilated traction motor for high-speed trains provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the stator core of a medium traction motor; Figure 3 for Figure 1 A schematic diagram of the airflow direction at the second air inlet position (second positioning pin not shown) in the traction motor.

[0042] This embodiment provides a high-power, fully enclosed, self-ventilated traction motor for high-speed trains. The motor includes a drive end 6 and a non-drive end 5, both of which jointly support a motor shaft 10. A rotor assembly 13 is mounted on the motor shaft 10, which also includes a rotor support 11 with axially arranged support ventilation holes 12. A first cooling fan 21 is installed on the non-drive end 5, and a second cooling fan 22 is installed on the drive end 6. Both cooling fans are supported by the rotor support 11. An external circulation airflow path is provided, with the outer blades of the first cooling fan 21 guiding the airflow. External airflow, after passing through the bracket ventilation hole 12 and being introduced by the second cooling fan 22, flows out through the axial ventilation hole 101 on the outer ring of the motor 1. The axial ventilation hole 101 dissipates heat from the stator through the stator heat dissipation hole of the stator core 2. In the internal circulation air path, the inner fan blade 211 of the first cooling fan 21 drives the airflow in the motor cavity to circulate. The internal circulation air path flows through the rotor ventilation holes 14 and 15 on the rotor assembly 13 and returns through the corner ventilation hole 23 of the motor. A heat exchange device is also provided in the motor cavity to exchange heat and cool the internal airflow.

[0043] A rotor bracket 11 is fitted between the motor shaft 10 and the rotor assembly 13, supporting the two cooling fans at the transmission end 6 and the non-transmission end 5. When the first cooling fan 21 and the second cooling fan 22 operate, airflow passes through the bracket ventilation holes 12 and enters the axial ventilation holes 101. The axial ventilation holes 101 flow through the stator cooling holes, forming an external circulation airflow path for cooling the inner ring of the rotor and the outer ring of the stator. Simultaneously, the inner blades of the first cooling fan 21, within the motor cavity, drive the airflow through the rotor assembly 11 to the corner ventilation holes 23 at the four corners of the motor, forming an internal circulation airflow path. A heat exchange device cools the airflow in the internal circulation path, improving the heat dissipation effect of the motor cavity and enhancing the motor's heat dissipation capacity.

[0044] Furthermore, the internal circulation air path also includes internal circulation air path branches located on the motor base. The internal circulation air path branches include corner ventilation holes 23 on the four corners of the motor, a first radial ventilation hole 231 and a second radial ventilation hole 232 connected to the corner ventilation holes 23.

[0045] The motor 1 has four corners of the frame, and a corner ventilation hole 23 is provided in each corner of the frame. This hole serves as a branch of the internal circulation airflow cooling system of the motor 1. The internal airflow of the motor circulates through the four corners of the frame of the motor 1 and then scatters out from the four corners of the frame.

[0046] Furthermore, the first cooling fan 21 is located at the non-drive end 5 of the motor 1, as shown in the figure. Its inner fan blades 212, as the first cooling fan 21 rotates, create airflow to the rotor assembly 13. The inner fan blades 212 guide this airflow out through the rotor assembly 13, from the center of the motor to the four corners of the outer frame, through the corner ventilation holes 23, forming an internal circulation. The four corners of the frame are located near the motor base of the motor 1, according to... Figure 1 As shown in the motor arrangement, the first radial ventilation hole 231 is located on the right side of the stator core 2, and the second radial ventilation hole 232 is located on the left side of the stator core 2. The airflow led out by the inner fan blade 212 passes through the rotor assembly 13, enters through the first radial ventilation hole 231, passes through the corner ventilation holes 23 at the four corners of the frame, and then flows back into the motor cavity through the second radial ventilation hole 232. After that, it enters the rotor assembly 13 through the motor drive end 6, and enters the non-drive end 5 of the motor through the inner rotor ventilation holes 14 and 15, forming an internal circulation air duct.

[0047] In one specific embodiment of this case, the heat exchange device includes a first heat pipe 7 disposed on the top of the motor 1 and near the end cap of the non-drive end 5; and a second heat pipe 24 disposed in the corner ventilation hole 23. The medium inside the heat pipe is a special liquid. When the internal temperature of the end cap of the non-drive end 5 of the motor rises, the evaporation end of the heat pipe is heated, and the special liquid in the heat pipe rapidly vaporizes. The vapor flows to the other end under the power of heat diffusion, carrying away the heat inside the end cap. After condensing at the cold end, the heat is released, the vapor liquefies into liquid, and the liquid flows back to the evaporation end, repeating the cycle until the temperature at both ends of the heat pipe is equal.

[0048] The heat pipe includes a first heat pipe 7, which is located on the end cap of the non-drive end 5 of the motor 1. Specifically, the air inlet side of the inner fan blade 212 is arranged opposite to the rotor ventilation holes 14 and 15, and its exhaust side is arranged obliquely upward toward the first heat pipe 7. The first heat pipe 7 is arranged close to the non-drive end 5. By arranging the exhaust side of the inner fan blade 212 opposite to the first heat pipe 7, the evaporation end of the first heat pipe 7 is in the internal circulation air path of the motor cavity. The internal circulation air path passes through the inner fan blade 212 of the first cooling fan 21. The first cooling fan 21 has a horn-shaped structure that is obliquely upward from the inner ring of the motor to the outer ring, so that the exhaust airflow of the inner fan blade 212 is obliquely toward the first heat pipe 7. The air outlet at the top of the inner fan blade 212 faces the evaporation end of the first heat pipe 7. Heat exchange is achieved through the counterclockwise airflow formed by the internal circulation air path. The airflow driven by the inner fan blade 212 accelerates the diffusion of hot vapor at the evaporation end of the first heat pipe 7, thereby cooling the airflow in the motor cavity.

[0049] Preferably, the evaporation end of the first heat pipe 7 is arranged near the outlet of the axial ventilation hole 101. The axial ventilation hole 101 includes an external circulation air path branch that connects to the stator ventilation hole on the stator core 2. The cold end of the first heat pipe 7 is in the external circulation air path, near the outlet of the axial ventilation hole 101 of the motor 1. The cold air flowing out of the axial ventilation hole 101 from the external circulation air path accelerates the condensation of the vapor at the cold end of the first heat pipe 7, ultimately transferring the heat inside the end cover of the non-drive end 5 of the motor 1 to the outside, achieving the effect of cooling the motor end cover and reducing the temperature of the bearing unit at the non-drive end of the bearing. It can be understood that the axial ventilation hole 101 of the motor 1 includes multiple stator ventilation holes on the stator core 2 surrounding the motor housing. The outlet position of each axial ventilation hole 101 is correspondingly provided with a first heat pipe 7. Through several first heat pipes 7, the heat dissipation capacity of the airflow inside the motor cavity is improved.

[0050] To accelerate heat dissipation from the four corners of motor 1, second heat pipes 24 are installed in the air ducts at each of the four corners of the motor. The installation of the second heat pipes 24 within the internal circulation air ducts 23 formed by the four corners of the motor frame can be done in two ways: one is horizontal installation parallel to the airflow direction within the four corner air ducts, with the number of pipes determined by the motor's structure and cooling requirements; the other is vertical installation perpendicular to the airflow direction within the internal circulation air ducts, again with the number of pipes determined by the motor's structure and cooling requirements. Ultimately, this transfers the heat from the internal circulation air ducts 23 at the four corners of the motor frame to the outside, accelerating the cooling of the motor frame.

[0051] The rotor assembly 13 is fixed on the rotor bracket 11. The rotor assembly 13 is provided with rotor ventilation holes 14 and 15, which can effectively reduce the temperature of the rotor assembly 13 and its permanent magnet 16. The permanent magnet 16 is inserted into the rotor assembly 13. The permanent magnet of the rotor assembly 13 is fixed by the non-drive end permanent magnet baffle ring 17 and the drive end permanent magnet baffle ring 18. The rotor assembly 13 is fixed with rotor rings 19 and 20 respectively placed on the non-drive end 5 and the drive end 6. The rotor rings 19 and 20 are designed with the confluence of the two air paths of the rotor assembly 13 as inlet and outlet.

[0052] In a specific embodiment of this case, the internal circulation airflow passes through the rotor ventilation holes 14 and 15 of the motor rotor assembly 13. The two ends of the rotor ventilation holes 14 and 15 are respectively connected to the transmission end 6 and the non-transmission end 5. The rotor ventilation holes 14 and 15 each include a plurality of heat dissipation hole units arranged at intervals, and the adjacent two heat dissipation hole units form a heat dissipation rib for heat transfer.

[0053] The stator core 2 yoke dissipates heat through heat dissipation holes 200 opened along the axial direction. The heat dissipation holes 200 are composed of multiple heat dissipation hole units. Adjacent heat dissipation hole units are surrounded by heat dissipation ribs 240. The heat dissipation ribs 240 divide the heat dissipation holes into multiple channels composed of heat dissipation hole units. When the motor dissipates heat, the heat is ventilated and carried away by the internal channels of the heat dissipation hole units. The heat dissipation ribs 240 increase the heat dissipation area during the ventilation process of the heat dissipation holes, thereby improving the heat dissipation capacity. At the same time, the heat dissipation ribs 240 separate the heat dissipation holes 200 composed of multiple heat dissipation hole units, ensuring the structural strength of the stator core while reducing the weight of the motor.

[0054] Specifically, the heat dissipation hole unit consists of one central heat dissipation hole unit 230, two inner ring heat dissipation hole units 220, and two outer ring heat dissipation hole units 210; the two inner ring heat dissipation hole units 220 and the central heat dissipation hole unit 230 form an inner ring heat dissipation rib; the two outer ring heat dissipation hole units 210 and the inner ring heat dissipation hole units 220 form an outer ring heat dissipation rib; the inner ring heat dissipation ribs are arranged along the radial direction of the stator core 2, inclined from the inside to the outside, close to the central heat dissipation hole unit 230; the outer ring heat dissipation ribs are arranged along the radial direction of the stator core 2, extending from the inside to the outside.

[0055] The inner ring heat dissipation ribs are inclined towards the central heat dissipation hole unit 230, which has an isosceles triangle or isosceles trapezoidal structure. The outer ring heat dissipation ribs are in the same radial direction as the stator core 2, so that the inner ring heat dissipation hole unit 220 has a right trapezoidal or direct triangle structure, and the outer ring heat dissipation hole unit 210 has a semi-circular structure. By designing multiple heat dissipation ribs 240 with different inclination angles, the heat dissipation ribs formed by the five heat dissipation hole units of different shapes form a "W" shape, which maximizes the ventilation and heat dissipation area while ensuring the strength requirements of the stator core 1 and reduces the weight of the core.

[0056] In a specific embodiment of this case, a second air inlet 52 is provided on the second motor end cover 51 of the transmission end 5. The second motor end cover 51 and the second cooling fan 22 form a first buffer cavity A, which is located between the second air inlet 52 and the bracket ventilation hole 12. The second motor end cover 51 and the second cooling fan 22 also form a second buffer cavity B, which is close to the air inlet side of the axial ventilation hole 101.

[0057] In a specific implementation of this case, the second cooling fan 22 also includes a small fan blade 63 located at the front end of the second air inlet 62 and a large fan blade 64 located at the rear end of the second air inlet 62; the second cooling fan 62 extends obliquely upward from the inner ring to the outer ring of the second motor end cover 61.

[0058] As the second cooling fan 22 rotates, the small fan blade 63 attracts the airflow flowing into the bracket ventilation hole 12, and the airflow flows into the external circulation air duct; the large fan blade 64 also attracts airflow, simultaneously attracting the airflow introduced by the second air inlet 62 and the airflow discharged by the small fan blade 63. After the two airflows converge, they are sent into the axial ventilation hole 101 of the motor through the second cooling fan 22. Through the structural design of the two fan blades of the small fan blade 63 and the large fan blade 64, the airflow sent in by the bracket ventilation hole 12 and the second air inlet 62 can be attracted at the same time, ensuring the smooth flow of airflow in the external circulation air duct.

[0059] The large fan blade 64 is a fan blade with an arc-shaped cross-section. Preferably, the large fan blade 64 is a semi-circular fan blade 65 with a semi-circular cross-section. The semi-circular structure of the large fan blade 64 helps to reduce wind wear and reduces motor noise.

[0060] The first buffer cavity A is formed between the near end 2201 of the second cooling fan 22, the second motor end cover 61, and the small fan blade 62. The first buffer cavity A is arranged close to the bracket ventilation hole 12. The first buffer cavity A is set to reduce the airflow velocity in the bracket ventilation hole 12, and at the same time, it can increase the flow of cooling air through the bracket ventilation hole 12, effectively reducing the temperature of the bearing unit on the motor shaft 10.

[0061] In this specific case, a second buffer cavity B is formed between the distal end 2202 of the second cooling fan 22, the second motor end cover 61, and the large fan 64. The second buffer cavity B is located near the axial ventilation hole 101 on the outer ring of the second motor end cover 51, specifically near the stator heat dissipation hole of the stator core 2. The length of the large fan blade 64 is greater than the length of the small fan blade 63, resulting in a greater airflow rate of the large fan blade 64 than that of the small fan blade 63. When the second cooling fan 22 rotates, the airflow driven by the large fan blade 64 simultaneously attracts the airflow introduced by the second air inlet 62 and the small fan blade 63. The second buffer cavity B, formed by the distal end 2202 of the second cooling fan 22 and the second motor end cover 61, and the semi-circular structure design of the second buffer cavity B and the large fan blade 64, increases the overall airflow rate of the second cooling fan 22 and effectively reduces the noise during the operation of the second cooling fan 22.

[0062] In one specific embodiment of this case, both the small fan blade 63 and the large fan blade 64 are arranged at an angle close to the second motor end cover 61. The angle of inclination of the large fan blade 64 is greater than that of the small fan blade 63, making the second cooling fan 22 have an overall inclined structure and a trumpet-shaped structure. At the same time, setting the angle of inclination of the large fan blade 64 to be greater than that of the small fan blade 63 creates a circulating air channel inside the motor, improving the motor's heat dissipation capacity.

[0063] In a specific embodiment of this case, a first motor end cover 51 is provided at the non-transmission end. A detachable first bearing unit 8 is arranged on the inner ring of the first motor end cover 51. A plurality of first positioning pins 52 that can approach and move away from the first cooling fan 21 are arranged around the first motor end cover 51. The protruding end of the first positioning pin 52 is fitted with an annular structure and a first support ring 53 that is pressed and engaged with the first cooling fan 21.

[0064] The inner ring of the second motor end cover 61 is provided with a detachable second bearing unit 9. Multiple second positioning pins 67 that can approach and move away from the second cooling fan 22 are arranged around the second motor end cover 61. The protruding end of the second positioning pin 67 is equipped with a ring structure and a second support ring 68 that is pressed and engaged with the second cooling fan.

[0065] The adjustment methods of the first support ring 53 and the second support ring 68 are the same, and the adjustment structure of the first support ring 53 will be used as an example for explanation.

[0066] The first support ring 53 has a ring-shaped structure and an annular pressing end face that presses and separates synchronously with the multiple outer fan blades 212 of the first cooling fan 21. The extension and retraction are adjusted by the first positioning pin 52. When disassembling the first bearing unit 8, the outer fan blades 212 on the first cooling fan 21 are pressed against the first support ring 53 at the same time to ensure the stability of the disassembly process of the first bearing unit 8.

[0067] Specifically, when disassembling the first bearing unit 8, adjust the first positioning pin 52 to slide inward along the guide hole, so that the first support ring 53 is pressed onto the outer fan blade 212. At this time, the first bearing unit 8 is disassembled as a whole for the replacement or repair of its inner bearing. After installing the first bearing unit 8, adjust the first positioning pin 52 to slide outward along the guide hole, the first support ring 53 separates from the outer fan blade 212, the first support ring 53 extends to the inside of the end cover, the adjusting shim moves the first positioning pin 52 horizontally and presses it, and the fixing bolt is locked, thus completing the disassembly and assembly of the bearing unit.

[0068] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-power, fully enclosed, self-ventilated traction motor for high-speed trains, the motor comprising a drive end and a corresponding non-drive end, both supporting a motor shaft, a rotor assembly mounted on the motor shaft, and a stator core disposed on the outer ring of the rotor assembly, characterized in that... Also includes: The rotor support has axially arranged support ventilation holes. The non-drive end is equipped with a first cooling fan, and the drive end is equipped with a second cooling fan. Both cooling fans are supported by the rotor bracket. The external circulation air path is as follows: the outer blades of the first cooling fan introduce external airflow, which flows through the ventilation holes of the bracket and merges with the external airflow introduced by the second cooling fan. The airflow then flows out through the axial ventilation holes of the outer ring of the motor, and the axial ventilation holes pass through the stator heat dissipation holes of the stator core. The internal circulation airflow path is such that the inner fan blades of the first cooling fan drive the airflow to circulate within the motor cavity; The internal circulation airflow passes through the rotor ventilation hole on the rotor assembly and returns through the corner ventilation hole of the motor. A heat exchange device for cooling the internal airflow is also provided in the motor cavity. The heat exchange device includes a first heat pipe disposed on the end cover of the non-drive end of the motor. The evaporation end of the first heat pipe is arranged near the air outlet of the axial ventilation hole in the external circulation air path. The cold end of the first heat pipe is in the external circulation air path, near the air outlet of the axial ventilation hole of the motor. The cold air flowing out of the axial ventilation hole in the external circulation air path accelerates the condensation of the vapor at the cold end of the first heat pipe, and finally transfers the heat inside the end cover of the non-drive end of the motor to the outside.

2. The traction motor according to claim 1, characterized in that, The internal circulation air path also includes an internal circulation air path branch provided on the motor base. The internal circulation air path branch includes the corner ventilation hole, a first radial ventilation hole connected to the corner ventilation hole and respectively close to the non-drive end, and a second radial ventilation hole at the drive end.

3. The traction motor according to claim 2, characterized in that, It also includes a second heat pipe disposed within the corner ventilation hole.

4. The traction motor according to claim 3, characterized in that, The air inlet side of the inner fan blade is arranged opposite to the rotor ventilation hole, and its exhaust side is arranged inclined upward toward the first heat pipe.

5. The traction motor according to claim 4, characterized in that, The external circulation airflow passes through the stator heat dissipation holes of the motor stator core, and the two ends of the stator heat dissipation holes are respectively connected to the transmission end and the non-transmission end; Each of the stator heat dissipation holes includes multiple heat dissipation hole units arranged at intervals, and heat dissipation ribs are formed between two adjacent heat dissipation hole units to transfer heat.

6. The traction motor according to claim 5, characterized in that, The heat dissipation hole unit consists of one central heat dissipation hole unit, two inner ring heat dissipation hole units, and two outer ring heat dissipation hole units; The two inner ring heat dissipation hole units and the central heat dissipation hole unit form an inner ring heat dissipation rib; The two outer ring heat dissipation hole units and the inner ring heat dissipation hole unit form an outer ring heat dissipation rib; The inner ring heat dissipation fins are arranged along the radial direction of the stator core, inclined from the inside to the outside, close to the central heat dissipation hole unit; The outer ring heat dissipation fins extend from the inside to the outside along the radial direction of the stator core.

7. The traction motor according to claim 1, characterized in that, A second air inlet is provided on the second motor end cover of the transmission end, and a first buffer cavity is formed between the second motor end cover and the second cooling fan. The first buffer cavity is located between the second air inlet and the ventilation hole of the bracket. The second motor end cover and the second cooling fan also form a second buffer cavity, which is close to the air inlet side of the axial ventilation hole.

8. The traction motor according to claim 7, characterized in that, The second cooling fan also includes a small fan blade located at the front end of the second air inlet and a large fan blade located at the rear end of the second air inlet; The second cooling fan extends obliquely upward from the inner ring to the outer ring of the second motor end cover.

9. The traction motor according to claim 7, characterized in that, The non-transmission end is provided with a first motor end cover, and the inner ring of the first motor end cover is provided with a detachable first bearing unit. The first motor end cover is surrounded by a plurality of first positioning pins that can approach and move away from the first cooling fan. The protruding end of the first positioning pin is fitted with a ring structure and a first support ring that is pressed and engaged with the first cooling fan. The inner ring of the second motor end cover is equipped with a detachable second bearing unit. The second motor end cover is surrounded by a plurality of second positioning pins that can approach and move away from the second cooling fan. The protruding end of the second positioning pin is fitted with a ring structure and a second support ring that is pressed and engaged with the second cooling fan.

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