Traction motor

Abstract

The invention relates to the technical field of traction motors, and provides a traction motor which comprises a base, two end cover assemblies, a rotor assembly, a rotating shaft, a stator assembly and two water jackets. The two end cover assemblies are arranged at the two ends of the machine base in the axial direction respectively so as to jointly define a containing cavity. The rotor assembly is arranged in the accommodating cavity; the rotating shaft penetrates through the two end cover assemblies and the rotor assembly and can drive the rotor assembly to rotate; the stator assembly is arranged in the accommodating cavity and surrounds the peripheral side of the rotor assembly; the two water jackets are arranged in the containing cavity and connected with the two end cover assemblies respectively, a plane perpendicular to the axial direction serves as a projection plane, the projection range of the stator assembly is within the projection range of the water jackets, at least two of the rotating shaft, the machine base, the two end cover assemblies and the two water jackets form cooling channels, and the cooling channels are used for circulation of cooling media. According to the traction motor provided by the embodiment of the invention, the heat dissipation efficiency of the traction motor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of traction motors, and in particular to a traction motor. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] In the related art, during the operation of the traction motor, its stator, rotor, bearings and other components all generate heat. Usually, the traction motor can only dissipate the heat of part of the rotor structure, resulting in poor heat dissipation efficiency of the traction motor, affecting the working performance of the traction motor. Summary of the invention

[0004] In view of this, an embodiment of the present application hopes to provide a traction motor, which can improve the heat dissipation efficiency of the traction motor by increasing the number of cooling channels of the traction motor.

[0005] An embodiment of the present application provides a traction motor, comprising:

[0006] Machine base;

[0007] Two end cover assemblies, the two end cover assemblies are respectively arranged at two ends of the machine base along the axial direction to jointly define an accommodating cavity;

[0008] A rotor assembly is disposed in the accommodating cavity;

[0009] A rotating shaft, the rotating shaft is passed through the two end cover assemblies and the rotor assembly, and the rotating shaft can drive the rotor assembly to rotate;

[0010] A stator assembly is disposed in the accommodating cavity and surrounds the circumference of the rotor assembly;

[0011] Two water jackets are arranged in the accommodating cavity, and the two water jackets are respectively connected to the two end cover assemblies. The projection range of the stator assembly is located within the projection range of the water jacket, with the plane perpendicular to the axial direction as the projection plane, wherein the rotating shaft, the machine base, the two end cover assemblies and at least two of the two water jackets form a cooling channel, and the cooling channel is used to circulate a cooling medium.

[0012] In some embodiments, the cooling channel includes a first cooling channel, the machine base includes a base body, the base body is formed with the first cooling channel, the stator assembly includes a stator core, and the first cooling channel is surrounded by a circumference of the stator core.

[0013] In some embodiments, the first cooling channel includes two first guide chambers and multiple second guide chambers, the multiple second guide chambers are distributed along the circumferential direction and connected in sequence, the two first guide chambers are respectively connected to the second guide chamber at the head end and the second guide chamber at the tail end, the seat body is formed with a water inlet and a water outlet, the water inlet is connected to one of the first guide chambers, and the water outlet is connected to another first guide chamber.

[0014] In some embodiments, the machine base includes a flow guide member and a plurality of flow guide ribs, wherein the plurality of flow guide ribs are circumferentially spaced apart in the first cooling channel, two adjacent flow guide ribs have their ends axially far apart connected to the side wall of the first cooling channel, and two adjacent flow guide ribs have their ends axially facing each other spaced from the side wall of the first cooling channel, and the flow guide member connects two adjacent flow guide ribs.

[0015] In some embodiments, the cooling channel includes a second cooling channel, the rotating shaft is formed with a cooling air inlet, a cooling air outlet and a second cooling channel extending in the axial direction, and the second cooling channel connects the cooling air inlet and the cooling air outlet.

[0016] In some embodiments, a spiral groove communicating with the second cooling channel is formed on the rotating shaft, and the spiral groove extends spirally along a peripheral side wall of the second cooling channel.

[0017] In some embodiments, the cooling channel includes a third cooling channel, the end cover assembly includes a cover body and a bearing, the cover body is formed with the third cooling channel and a limiting cavity, the bearing is arranged in the limiting cavity and sleeved outside the rotating shaft, and the third cooling channel is surrounded by the outer periphery of the limiting cavity.

[0018] In some embodiments, the end cover assembly includes a water baffle, which is arranged in the third cooling channel to separate the third cooling channel, and the cover body is formed with a liquid inlet and a liquid outlet connected to the third cooling channel, and the liquid inlet and the liquid outlet are respectively located on both sides of the water baffle.

[0019] In some embodiments, the cooling channel includes a fourth cooling channel, the stator assembly includes a stator core and a stator winding, the stator winding includes winding ends extending from both ends of the stator core along the axial direction, the water jacket is formed with a fourth cooling channel, and the fourth cooling channels of the two water jackets are respectively arranged around the circumference of the two winding ends.

[0020] In some embodiments, the fourth cooling channel includes two first water guide chambers and multiple second water guide chambers, the multiple second water guide chambers are distributed along the circumferential direction and connected in sequence, the two first water guide chambers are respectively connected to the second water guide chamber at the head end and the second water guide chamber at the tail end, the water jacket is formed with a water inlet and a drain, the water inlet is connected to one of the first water guide chambers, and the drain is connected to another first water guide chamber.

[0021] In some embodiments, the traction motor includes a water baffle and a plurality of water guide plates, wherein the plurality of water guide plates are circumferentially spaced apart in the fourth cooling channel, wherein two adjacent water guide plates have their ends radially far apart connected to the side wall of the fourth cooling channel, and two adjacent water guide plates have their ends radially facing each other spaced from the side wall of the fourth cooling channel, and the water baffle is located between two adjacent water guide plates, and the water baffle has its ends radially connected to the side wall of the fourth cooling channel.

[0022] In some embodiments, the end cover assembly includes a cover body, the water jacket is formed with a water inlet and a water outlet communicating with the fourth cooling channel, and the water inlet and the water outlet penetrate the cover body.

[0023] In some embodiments, the traction motor includes a heat conductor, which is disposed between the water jacket and the winding end, and is used to transfer heat generated by the winding end to the water jacket.

[0024] In some embodiments, the stator assembly includes two stator pressing rings, and the two ends of the stator core along the axial direction are clamped between the two stator pressing rings. The stator pressing ring includes a heat conducting portion, and the heat conducting portion is used to transfer the heat generated by the stator core to the winding end.

[0025] In some embodiments, the traction motor includes a sealing gasket, which is sealingly clamped between the water jacket and the heat conductive portion.

[0026] Compared with the related art, the traction motor provided in the embodiment of the present application, when the two water jackets are formed with cooling channels, the heat generated by the stator assembly can be transferred to the cooling channels of the two water jackets for heat dissipation. On the projection plane perpendicular to the axial direction, the projection range of the stator assembly is located within the projection range of the water jacket, which can prevent the heat of the stator assembly from spreading to other parts to a certain extent, thereby improving the heat dissipation efficiency of the traction motor;

[0027] When the cooling channel is formed on the base and the rotating shaft, on the one hand, the heat generated by the stator assembly and the rotor assembly is dissipated through the two cooling channels respectively, without having to be transferred to the stator assembly first and then dissipated, thereby shortening the heat transfer path and improving the heat dissipation efficiency of the traction motor. On the other hand, there is no need to set a cooling air duct on the rotor assembly, and to set a coaxially rotating cooling fan, which can reduce the impact on the rotating shaft and the rotor assembly and improve the operating efficiency of the traction motor;

[0028] In the case where the two end cover assemblies are formed with cooling channels, the heat generated by the end cover assemblies can be dissipated through their own cooling channels, shortening the heat transfer path. In addition, the heat generated by the components in the surrounding parts can also be transferred to the end cover assemblies, and then dissipated through the cooling channels of the end cover assemblies, increasing the heat dissipation path and improving the heat dissipation efficiency of the traction motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a traction motor provided in some embodiments of the present application;

[0030] Figure 2 A cross-sectional view of a traction motor provided for some embodiments of the present application, wherein hollow arrows exemplarily represent the flow path of the cooling medium in the cooling channel;

[0031] Figure 3 A perspective view of a machine base provided for some embodiments of the present application, wherein hollow arrows exemplarily represent flow paths of cooling medium in cooling channels;

[0032] Figure 4 A schematic diagram of the structure of a cover body provided in some embodiments of the present application;

[0033] Figure 5 for Figure 4 A schematic diagram of the structure shown in another perspective;

[0034] Figure 6 A schematic diagram of the structure of a water jacket provided in some embodiments of the present application;

[0035] Figure 7 for Figure 6 Cross-sectional view at position aa;

[0036] Figure 8 for Figure 7 A is an enlarged view of point A, wherein the hollow arrows exemplarily represent the flow path of the cooling medium in the cooling channel;

[0037] Fig. 9 for Figure 2 Enlarged view of point B in the middle;

[0038] Fig.10 for Figure 2 Enlarged view of point C in the middle.

[0039] Description of Reference Numerals

[0040] Traction motor 100; accommodating cavity 100a; cooling channel 100b;

[0041] Base 1; base body 11; first cooling channel 11a; first flow guide chamber 11a1; second flow guide chamber 11a2; water inlet 11b; water outlet 11c; flow guide member 12; flow guide rib 13;

[0042] End cover assembly 2; cover body 21; third cooling channel 21a; limiting cavity 21b; liquid inlet 21c; liquid outlet 21d; limiting hole 21e; ​​bearing 22;

[0043] Rotor assembly 3; rotor core 31;

[0044] Rotating shaft 4; driving end 4a; non-driving end 4b; cooling air inlet 4c; cooling air outlet 4d; second cooling channel 4e; spiral groove 4f;

[0045] stator assembly 5; stator core 51; stator winding 52; winding end 521; stator pressing ring 53; heat conducting part 531;

[0046] Water jacket 6; fourth cooling channel 6a; first water guide chamber 6a1; second water guide chamber 6a2; water inlet 6b; drain outlet 6c; sealing groove 6d; sealing end surface 6d1;

[0047] Water retaining plate 7;

[0048] Water guide plate 8;

[0049] Heat conducting member 9;

[0050] Sealing gasket 10;

[0051] Temperature sensor 20;

[0052] Fastener 30. DETAILED DESCRIPTION

[0053] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0054] The various specific technical features and embodiments described in the specific implementation methods can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in this application are no longer described separately. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] In the related art, traction motors include fully enclosed traction motors and open motors. Compared with open motors, fully enclosed traction motors have lower heat dissipation efficiency. In some cases, fully enclosed traction motors use a base water cooling structure to dissipate heat. The base water cooling structure is to set a cooling water channel in the base. The heat generated by the rotor is first transferred to the stator, and then the heat generated by both the rotor and the stator is taken away by heat conduction. Therefore, only limited components can be dissipated, and the heat dissipation efficiency is poor. In some cases, fully enclosed traction motors use a base water cooling + internal circulation air cooling structure to dissipate heat. The base water cooling + internal circulation air cooling structure is to set a cooling water channel in the base to take away the heat generated by the stator by heat conduction; a cooling air channel is set on the base and the rotor, and a coaxially rotating cooling fan is set on the rotor. The heat generated by the rotor is transferred to the cooling air channel through the internal circulation cooling air, and then transferred to the cooling water channel and taken away by heat convection. The heat dissipation efficiency is also not ideal, and the cooling fan will affect the operating efficiency of the rotor.

[0056] See also Figures 1 to 10 An embodiment of the present application provides a traction motor 100, including a base 1, two end cover assemblies 2, a rotor assembly 3, a rotating shaft 4, a stator assembly 5 and two water jackets 6.

[0057] The traction motor 100 can generate traction to drive the vehicle, and is commonly used in railway mainline electric locomotives, industrial and mining electric locomotives, electric transmission diesel locomotives, and various electric vehicles, etc. For ease of description, the present application describes the traction motor 100 as a fully enclosed traction motor.

[0058] The two end cover assemblies 2 are respectively arranged at the two ends of the base 1 along the axial direction to define a receiving chamber 100a together. The receiving chamber 100a is used to place other components of the traction motor 100, which can prevent impurities such as hair scraps and dust from entering the traction motor 100, thus playing a better protective role.

[0059] The rotor assembly 3 is disposed in the accommodating cavity 100a; the rotating shaft 4 is disposed through the two end cover assemblies 2 and the rotor assembly 3, and the rotating shaft 4 can drive the rotor assembly 3 to rotate. Specifically, the rotor assembly 3 is connected to the rotating shaft 4, and the rotating shaft 4 can rotate around the central axis of the rotating shaft 4, that is, when the rotating shaft 4 rotates, the rotor assembly 3 can rotate around the central axis of the rotating shaft 4. When the rotating shaft 4 does not rotate, the rotor assembly 3 does not rotate around the central axis of the rotating shaft 4.

[0060] For example, see Figure 2 The rotating shaft 4 has a transmission end 4a and a non-transmission end 4b which are spaced apart in the axial direction. The transmission end 4a is used to transmit the rotation speed and torque of the traction motor 100 to the external load to realize the normal operation and power output of the traction motor 100; the non-transmission end 4b is used to connect to an external power source to transmit the electric energy of the external power source to the traction motor 100. Two end cover assemblies 2 are respectively located at the transmission end 4a and the non-transmission end 4b.

[0061] It should be noted that, in the present application, the axial direction and the radial direction respectively refer to the axial direction of the rotating shaft 4 and the radial direction of the rotating shaft 4 .

[0062] The stator assembly 5 is arranged in the accommodating cavity 100a and is arranged around the circumference of the rotor assembly 3; two water jackets 6 are arranged in the accommodating cavity 100a, and the two water jackets 6 are respectively connected to the two end cover assemblies 2, and the projection range of the stator assembly 5 is located within the projection range of the water jacket 6, with the plane perpendicular to the axial direction as the projection plane, wherein the rotating shaft 4, the base 1, the two end cover assemblies 2 and at least two of the two water jackets 6 form a cooling channel 100b, and the cooling channel 100b is used to circulate the cooling medium. The cooling medium refers to a substance that can absorb heat and achieve cooling. The cooling medium includes but is not limited to a gas phase cooling medium, a liquid phase cooling medium, and the like.

[0063] For example, see Figure 2 and Figure 6 Two water jackets 6 are arranged at both ends of the stator assembly 5 along the axial direction, and the two water jackets 6 form cooling channels 100b, wherein a liquid phase cooling medium can flow through the cooling channels 100b of the water jackets 6. The heat generated by the stator assembly 5 can be transferred to the cooling channels 100b of the two water jackets 6, and the heat is taken away by the liquid phase cooling medium for heat dissipation. On the projection plane perpendicular to the axial direction, the projection range of the stator assembly 5 is located within the projection range of the water jacket 6, so that the heat of the stator assembly 5 can be prevented from diffusing to other parts to a certain extent, thereby improving the heat dissipation efficiency of the traction motor 100.

[0064] For example, see Figure 2 and Figure 3, the base 1 and the rotating shaft 4 form a cooling channel 100b, wherein a liquid cooling medium can flow through the cooling channel 100b of the base, and a gaseous cooling medium can flow through the cooling channel 100b of the rotating shaft 4. The heat generated by the stator assembly 5 can be transferred to the cooling channel 100b of the base 1, and the heat is taken away by the liquid cooling medium for heat dissipation, and the heat generated by the rotor assembly 3 can be transferred to the cooling channel 100b of the rotating shaft 4, and the heat is taken away by the gaseous cooling medium for heat dissipation. In this way, compared with the related art, on the one hand, the heat generated by the stator assembly 5 and the rotor assembly 3 is taken away by the cooling medium of the two cooling channels 100b respectively, and the heat generated by the rotor assembly 3 can be directly transferred to the rotating shaft 4 for heat dissipation, without having to be transferred to the stator assembly 5 first and then heat dissipated, thereby shortening the heat transfer path and improving the heat dissipation efficiency of the traction motor 100. On the other hand, there is no need to set a cooling air duct on the rotor assembly 3, and set a coaxially rotating cooling fan, which can reduce the impact on the rotating shaft 4 and the rotor assembly 3, and improve the operating efficiency of the traction motor 100.

[0065] For example, see Figure 2 and Figure 4 The two end cover assemblies 2 are formed with cooling channels 100b, wherein a liquid cooling medium can flow through the cooling channels 100b of the end cover assemblies 2, and the liquid cooling medium can take away the heat generated by the end cover assemblies 2 and the components in the surrounding areas. In this way, compared with the related art, the heat generated by the end cover assemblies 2 can be dissipated through their own cooling channels 100b, shortening the heat transfer path. In addition, the heat generated by the components in the surrounding areas can also be transferred to the end cover assemblies 2, and then dissipated through the cooling channels 100b of the end cover assemblies 2, increasing the heat dissipation path and improving the heat dissipation efficiency of the traction motor 100.

[0066] Compared with the related art, the traction motor 100 provided in the embodiment of the present application has a cooling channel 100b formed in the two water jackets 6, and the heat generated by the stator assembly 5 can be transferred to the cooling channels 100b of the two water jackets 6 for heat dissipation. On the projection plane perpendicular to the axial direction, the projection range of the stator assembly 5 is located within the projection range of the water jacket 6, which can prevent the heat of the stator assembly 5 from diffusing to other parts to a certain extent, thereby improving the heat dissipation efficiency of the traction motor 100;

[0067] In the case where the cooling channel 100b is formed on the base 1 and the rotating shaft 4, on the one hand, the heat generated by the stator assembly 5 and the rotor assembly 3 is dissipated through the two cooling channels 100b respectively, and there is no need to first transfer the heat to the stator assembly 5 and then dissipate the heat, thereby shortening the heat transfer path and improving the heat dissipation efficiency of the traction motor 100. On the other hand, there is no need to set a cooling air duct on the rotor assembly 3, and set a coaxially rotating cooling fan, which can reduce the impact on the rotating shaft 4 and the rotor assembly 3, and improve the operating efficiency of the traction motor 100;

[0068] In the case where the two end cover assemblies 2 are formed with cooling channels 100b, the heat generated by the end cover assembly 2 can be dissipated through its own cooling channel 100b, shortening the heat transfer path. In addition, the heat generated by the components in the surrounding parts can also be transferred to the end cover assembly 2, and then dissipated through the cooling channel 100b of the end cover assembly 2, increasing the heat dissipation path and improving the heat dissipation efficiency of the traction motor 100.

[0069] In one embodiment, please refer to Figure 2 The shaft 4, the base 1, the two end cover assemblies 2 and the two water jackets 6 are all formed with cooling channels 100b, that is, the heat generated by the rotor assembly 3 can be dissipated through the cooling channel 100b of the shaft 4, the heat generated by the stator assembly 5 can be dissipated through the cooling channel 100b of the two water jackets 6 and the base 1, and the heat generated by the end cover assembly 2 can be dissipated through its own cooling channel 100b. In this way, on the one hand, by providing cooling channels 100b on multiple components, the heat dissipation path can be increased, and the heat generated by each component can be directly transferred to the closest cooling channel 100b, thereby improving the heat dissipation efficiency. On the other hand, there is no need to provide an additional heat dissipation structure to assist in heat dissipation, thereby improving the power density of the traction motor 100, reducing the weight of the traction motor 100, and improving the versatility of the traction motor 100, so as to achieve large-scale application in electric locomotives and other fields.

[0070] For some examples, see Figure 2 and Figure 3 The cooling channel 100b includes a first cooling channel 11a. The base 1 includes a base body 11. The base body 11 is formed with the first cooling channel 11a. The stator assembly 5 includes a stator core 51. The first cooling channel 11a is surrounded by the circumference of the stator core 51.

[0071] The stator core 51 is used to form the magnetic circuit of the traction motor 100, which can reduce the magnetic resistance of the magnetic circuit, so that the magnetic flux can pass more effectively, thereby reducing the magnetic energy loss. The stator core 51 can be made of a magnetic material with high magnetic permeability, such as silicon steel sheets.

[0072] For example, see Figure 2The stator core 51 is roughly annular in structure, and the first cooling channel 11a is arranged around the outer periphery of the stator core 51, and the outer peripheral surface of the stator core 51 is in contact with the seat body 11. In this way, the heat generated by the stator core 51 can be directly transferred to the seat body 11 through the yoke of the stator core 51, and transferred to the cooling medium through the convection heat transfer of the cooling medium in the first cooling channel 11a, and the cooling medium takes the heat out of the traction motor 100. In this way, not only can the heat transfer path be shortened, but also the heat exchange area between the seat body 11 and the stator core 51 can be increased, so as to prevent the heat generated by the stator core 51 from diffusing and improve the heat dissipation efficiency.

[0073] The yoke of the stator core 51 refers to the part of the stator core 51 close to the seat body 11, and plays a supporting and fixing role.

[0074] For some examples, see Figure 3 The first cooling channel 11a includes two first flow guiding chambers 11a1 and a plurality of second flow guiding chambers 11a2, the plurality of second flow guiding chambers 11a2 are distributed along the circumferential direction and are connected in sequence, the two first flow guiding chambers 11a1 are respectively connected to the second flow guiding chamber 11a2 at the head end and the second flow guiding chamber 11a2 at the tail end, the seat body 11 is formed with a water inlet 11b and a water outlet 11c, the water inlet 11b is connected to one of the first flow guiding chambers 11a1, and the water outlet 11c is connected to another first flow guiding chamber 11a1. The cooling medium flowing in the first cooling channel 11a can be a liquid cooling medium, such as water.

[0075] Please continue reading Figure 3 The water inlet 11b and the water outlet 11c are connected to the first and last ends of the first cooling channel 11a respectively. The water can flow into the first guide chamber 11a1 through the water inlet 11b, and then flow into the second guide chamber 11a2 at the head end, and then flow through multiple second guide chambers 11a2 in sequence until it flows into the second guide chamber 11a2 at the tail end, and finally flow to the outside through another first guide chamber 11a1 and the water outlet 11c to take away the heat. In this way, the flow path of the water in the first cooling channel 11a can be extended, and the flow time of the water in the first cooling channel 11a can be increased, so that the water can fully absorb and take away the heat, thereby improving the heat dissipation efficiency.

[0076] For some examples, see Figure 3 The base 1 includes a flow guide 12 and a plurality of flow guide ribs 13. The plurality of flow guide ribs 13 are circumferentially spaced apart in the first cooling channel 11a. Two adjacent flow guide ribs 13 are connected to the side wall of the first cooling channel 11a at two ends axially away from each other. Both ends of two adjacent flow guide ribs 13 facing each other axially are spaced from the side wall of the first cooling channel 11a. The flow guide 12 connects the two adjacent flow guide ribs 13.

[0077] The guide member 12 and the guide rib 13 play a guiding role for the water. Figure 3 The space between the guide member 12 and two adjacent guide ribs 13 is respectively two first guide chambers 11a1, and the space between two adjacent guide ribs 13 is a second guide chamber 11a2.

[0078] Please continue reading Figure 3 The guide member 12 connects two adjacent guide ribs 13 , that is, the head and tail ends of the first cooling channel 11 a are isolated, and the first cooling channel 11 a is generally in an open ring structure.

[0079] For example, see Figure 3 The length of the guide rib 13 is less than the axial length of the first cooling channel 11a, and the two ends of the multiple guide ribs 13 along the axial direction are alternately connected to the two axially opposite side walls of the first cooling channel 11a. In this way, the first cooling channel 11a bends and extends along the circumferential direction, further extending the flow path of the water in the first cooling channel 11a and improving the heat dissipation efficiency.

[0080] It should be noted that, in the present application, a plurality refers to a quantity including two or more.

[0081] In one embodiment, please refer to Figure 3 The traction motor 100 includes a temperature sensor 20, which is disposed on the guide member 12. The temperature sensor 20 can be used to detect the temperature of the water so as to provide real-time feedback on the heat dissipation condition.

[0082] The specific type of the temperature sensor 20 is not limited, for example, it can be a resistance temperature sensor.

[0083] For some examples, see Figure 2 The cooling channel 100b includes a second cooling channel 4e, the rotating shaft 4 is formed with a cooling air inlet 4c, a cooling air outlet 4d and a second cooling channel 4e extending in the axial direction, and the second cooling channel 4e is connected to the cooling air inlet 4c and the cooling air outlet 4d. That is, the cooling medium flowing in the second cooling channel 4e can be a gas phase cooling medium such as air.

[0084] External air flow can flow into the rotating shaft 4 through the cooling air inlet 4c, take away the heat generated by the rotor assembly 3 while flowing through the second cooling channel 4e, and be discharged through the cooling air outlet 4d, so that the traction motor 100 forms a self-ventilating cooling structure, improves the heat dissipation efficiency, and ensures the operating stability of the traction motor 100.

[0085] For example, see Figure 2The rotor assembly 3 includes a rotor core 31 and a permanent magnet. The rotating shaft 4 is disposed through the rotor core 31. The rotating shaft 4 can drive the rotor core 31 to rotate. The permanent magnet is disposed in the rotor core 31. During the operation of the traction motor 100, the heat generated by the permanent magnet is transferred to the rotor core 31, and the heat generated by the rotor core 31 itself is transferred to the peripheral side wall of the rotating shaft 4 through the yoke of the rotor core 31. The high-speed airflow transfers the heat to the airflow after convective heat exchange with the peripheral side wall of the rotating shaft 4, thereby dissipating the heat.

[0086] A permanent magnet refers to a structure with permanent magnetism. After the external magnetic field disappears, the permanent magnet can still maintain magnetism, so that the traction motor 100 can operate normally. The yoke of the rotor core 31 refers to the part of the rotor core 31 close to the rotating shaft 4, which plays a supporting and fixing role. The rotor core 31, the stator core 51 and the air gap between the two together constitute the magnetic circuit of the traction motor 100.

[0087] For some examples, see Figure 2 The rotating shaft 4 is formed with a spiral groove 4f connected to the second cooling channel 4e, and the spiral groove 4f spirally extends along the peripheral side wall of the second cooling channel 4e. The rotating shaft 4 can drive the spiral groove 4f to rotate. Specifically, the spiral groove 4f can rotate around the central axis of the rotating shaft 4, that is, when the rotating shaft 4 rotates, the spiral groove 4f can rotate around the central axis of the rotating shaft 4. When the rotating shaft 4 does not rotate, the spiral groove 4f does not rotate around the central axis of the rotating shaft 4.

[0088] When the external airflow flows through the second cooling channel 4e, part of the airflow enters the spiral groove 4f. The spiral groove 4f rotates to drive the airflow to rotate at high speed along the peripheral side wall of the second cooling channel 4e, so as to push the airflow in the second cooling channel 4e to be discharged from the cooling air outlet 4d, thereby improving the heat dissipation efficiency. At the same time, the rotation of the spiral groove 4f generates negative pressure, so that the air pressure at the cooling air inlet 4c is lower than the external air pressure, so that the external airflow can continuously flow into the second cooling channel 4e through the cooling air inlet 4c.

[0089] For some examples, see Figure 2 The cooling channel 100b includes a third cooling channel 21a. The end cover assembly 2 includes a cover body 21 and a bearing 22. The cover body 21 is formed with a third cooling channel 21a and a limiting cavity 21b. The bearing 22 is arranged in the limiting cavity 21b and sleeved outside the rotating shaft 4. The third cooling channel 21a is arranged around the outer periphery of the limiting cavity 21b. Specifically, the two cover bodies 21 are respectively connected to the two ends of the seat body 11 along the axial direction to jointly define the accommodating cavity 100a.

[0090] Exemplarily, the rotating shaft 4 includes an inner ring and an outer ring, the inner ring is connected to the rotating shaft 4, the rotating shaft 4 can drive the inner ring to rotate, and the outer ring is arranged around the outer circumference of the inner ring. The limiting cavity 21b can provide support force for the bearing 22, so that the outer ring remains stationary during the rotation of the rotating shaft 4, and the inner ring can rotate relatively smoothly and stably.

[0091] During the operation of the traction motor 100, the heat generated by the inner ring is transferred to the cover body 21 through the outer ring, and then transferred to the side wall of the third cooling channel 21a through the cover body 21. After the heat flow between the cooling medium and the side wall of the third cooling channel 21a is exchanged, the heat is transferred to the cooling medium, and then the heat is discharged.

[0092] The third cooling channel 21a is arranged around the outer periphery of the limiting cavity 21b, so that not only the heat transfer path can be shortened, but also the heat exchange area of ​​the cover 21 and the bearing 22 can be increased, thereby preventing the heat generated by the bearing 22 from diffusing and improving the heat dissipation efficiency.

[0093] For some examples, see Figure 4 and Figure 5 The end cover assembly 2 includes a water baffle, which is arranged in the third cooling channel 21a to block the third cooling channel 21a. The cover body 21 is formed with a liquid inlet 21c and a liquid outlet 21d connected to the third cooling channel 21a. The liquid inlet 21c and the liquid outlet 21d are respectively located on both sides of the water baffle. In other words, the third cooling channel 21a is isolated at both ends, and the third cooling channel 21a is an open ring structure. The cooling medium flowing in the third cooling channel 21a can be a liquid cooling medium, such as water.

[0094] Please continue reading Figure 4 The liquid inlet 21c and the liquid outlet 21d are respectively connected to the first and last ends of the third cooling channel 21a, and the water can flow into the third cooling channel 21a through the liquid inlet 21c, flow through the entire third cooling channel 21a along the circumferential direction, and then flow to the outside from the liquid outlet 21d to take away the heat. In this way, the flow path of the water in the third cooling channel 21a can be extended, and the flow time of the water in the third cooling channel 21a can be increased, so that the water can fully absorb and take away the heat, thereby improving the heat dissipation efficiency.

[0095] For some examples, see Figure 2 and Figure 6 The cooling channel 100b includes a fourth cooling channel 6a. The stator assembly 5 includes a stator core 51 and a stator winding 52. The stator winding 52 includes winding ends 521 extending from the stator core 51 at both ends along the axial direction. The water jacket 6 is formed with a fourth cooling channel 6a. The fourth cooling channels 6a of the two water jackets 6 are respectively arranged around the circumference of the two winding ends 521.

[0096] A winding is a group of turns of wire that form an electrical circuit corresponding to a certain voltage value.

[0097] For example, see Figure 6 The water jacket 6 is roughly annular in structure, and the fourth cooling channel 6a is arranged around the winding end 521. In this way, the heat generated by the winding end 521 can be transferred to the water jacket 6, and then dissipated through the cooling medium in the fourth cooling channel 6a. In this way, on the one hand, it is convenient for the heat of the winding end 521 to be transferred in time, and the heat exchange area of ​​the fourth cooling channel 6a and the winding end 521 is increased, so as to prevent the heat generated by the winding end 521 from diffusing. On the other hand, the heat generated by the winding end 521 does not need to be transferred to the first cooling channel 11a through the stator core 51 for heat dissipation, which shortens the heat transfer path and improves the heat dissipation efficiency of the traction motor 100.

[0098] In one embodiment, the stator winding 52 includes a winding straight segment disposed in the stator core 51, and two winding ends 521 are respectively connected to the two ends of the winding straight segment in the axial direction. The heat generated by the winding straight segment is transferred to the stator core 51, and can be directly transferred to the seat body 11 through the yoke of the stator core 51, and is transferred to the cooling medium through the convection heat transfer of the cooling medium in the first cooling channel 11a, thereby dissipating the heat.

[0099] For some examples, see Figure 7 The fourth cooling channel 6a includes two first water guide chambers 6a1 and a plurality of second water guide chambers 6a2, the plurality of second water guide chambers 6a2 are distributed along the circumferential direction and are connected in sequence, the two first water guide chambers 6a1 are connected to the second water guide chamber 6a2 at the head end and the second water guide chamber 6a2 at the tail end, respectively, the water jacket 6 is formed with a water inlet 6b and a drain port 6c, the water inlet 6b is connected to one of the first water guide chambers 6a1, and the drain port 6c is connected to another first water guide chamber 6a1. The cooling medium flowing in the fourth cooling channel 6a can be a liquid cooling medium, such as water.

[0100] Please continue reading Figure 7 The water inlet 6b and the drain outlet 6c are respectively connected to the first and last ends of the fourth cooling channel 6a, and the water can flow into the first water guide chamber 6a1 through the water inlet 6b, and then flow into the second water guide chamber 6a2 at the head end, and then flow through multiple second water guide chambers 6a2 in sequence until it flows into the second water guide chamber 6a2 at the tail end, and finally flow to the outside through another first water guide chamber 6a1 and the drain outlet 6c to take away the heat. In this way, the flow path of the water in the fourth cooling channel 6a can be extended, and the flow time of the water in the fourth cooling channel 6a can be increased, so that the water can fully absorb and take away the heat, thereby improving the heat dissipation efficiency.

[0101] For some examples, see Figure 7The traction motor 100 includes a water baffle 7 and a plurality of water guide plates 8. The plurality of water guide plates 8 are circumferentially spaced apart in the fourth cooling channel 6a. The two ends of two adjacent water guide plates 8 that are radially far away are connected to the side wall of the fourth cooling channel 6a. The two ends of two adjacent water guide plates 8 that are radially facing each other are spaced from the side wall of the fourth cooling channel 6a. The water baffle 7 is located between two adjacent water guide plates 8. The two ends of the water baffle 7 that are radially facing each other are connected to the side wall of the fourth cooling channel 6a.

[0102] The water baffle 7 and the water guide plate 8 play a role in guiding the water. Figure 7 and Figure 8 The space between the water baffle plate 7 and two adjacent water guide plates 8 is respectively two first water guide chambers 6a1, and the space between two adjacent water guide plates 8 is a second water guide chamber 6a2.

[0103] The two ends of the water baffle 7 in the radial direction are connected to the side walls of the fourth cooling channel 6a, that is, the first and last ends of the fourth cooling channel 6a are isolated from each other, and the fourth cooling channel 6a is substantially in an open ring structure.

[0104] For example, see Figure 6 The area of ​​the water guide plate 8 is smaller than the cross-sectional area of ​​the fourth cooling channel 6a, and the two radial ends of the plurality of water guide plates 8 are alternately connected to the two radially opposite side walls of the fourth cooling channel 6a. In this way, the fourth cooling channel 6a extends along the circumferential curve, further extending the flow path of the water in the fourth cooling channel 6a and improving the heat dissipation efficiency.

[0105] For some examples, see Figures 4 to 6 The water jacket 6 is formed with a water inlet 6b and a drain port 6c connected to the fourth cooling channel 6a, and the water inlet 6b and the drain port 6c penetrate the cover body 21. In this way, on the one hand, the water inlet 6b and the drain port 6c can not only be directly connected to the external water pipe, but also facilitate the cooling medium in the fourth cooling channel 6a to be directly discharged from the traction motor 100, which is convenient and quick. On the other hand, in the process of assembling the traction motor 100, the cover body 21 and the water jacket 6 can be assembled first, and the two can be regarded as an integrated structure, and then the cover body 21 is assembled to the seat body 11, which improves the assembly efficiency.

[0106] For example, see Figure 5 and Figure 6 The water inlet 6b and the drain outlet 6c are both provided with external pipes, and the water inlet 6b and the drain outlet 6c are connected with the external water source through the external pipes. The cover body 21 is formed with two limiting holes 21e, and the hole walls of the two limiting holes 21e are respectively sealed and connected with the outer surfaces of the two external pipes.

[0107] In one embodiment, please refer to Figure 1The traction motor 100 includes a plurality of fasteners 30 , and all fasteners 30 penetrate the cover body 21 and the water jacket 6 , so that the cover body 21 and the water jacket 6 can be easily loaded and unloaded.

[0108] In one embodiment, the cover body 21 and the water jacket 6 are connected by welding, so that the connection stability between the cover body 21 and the water jacket 6 can be enhanced.

[0109] For some examples, see Figure 2 and Fig. 9 The traction motor 100 includes a heat conductive member 9, which is disposed between the water jacket 6 and the winding end 521, and is used to transfer the heat generated by the winding end 521 to the water jacket 6. Specifically, at least part of the outer surfaces of both the water jacket 6 and the winding end 521 are in contact with the water jacket 6, so that, on the one hand, the water jacket 6 and the winding end 521 are respectively connected by the heat conductive member 9, so that the heat generated by the winding end 521 can be relatively smoothly transferred to the water jacket 6. On the other hand, the heat conductive member 9 can increase the heat exchange area, prevent the heat generated by the winding end 521 from diffusing, and improve the heat dissipation efficiency of the traction motor 100.

[0110] The specific material of the heat conducting member 9 is not limited, and it can be, for example, potting glue.

[0111] For some examples, see Figure 2 and Fig. 9 The stator assembly 5 includes two stator pressing rings 53, and the two ends of the stator core 51 along the axial direction are sandwiched between the two stator pressing rings 53. The stator pressing ring 53 includes a heat conducting portion 531, and the heat conducting portion 531 is used to transfer the heat generated by the stator core 51 to the winding end 521. The two stator pressing rings 53 support and fix the stator core 51, improve the stability of the stator core 51, and prevent the stator core 51 from loosening during the operation of the traction motor 100.

[0112] For example, see Figure 2 and Fig. 9 The stator core 51 and the winding end 521 are both in contact with the heat conducting part 531. Thus, on the one hand, the stator core 51 and the winding end 521 are respectively connected through the heat conducting part 531, so that the heat generated by the stator core 51 can be relatively smoothly transferred to the winding end 521, and then transferred to the water jacket 6 through the winding end 521 to discharge the heat. On the other hand, the heat conducting member 9 can increase the heat exchange area, prevent the heat generated by the winding end 521 from diffusing, and improve the heat dissipation efficiency of the traction motor 100.

[0113] The heat conducting portion 531 may be made of a sealant having high thermal conductivity.

[0114] For some examples, see Fig.10The traction motor 100 includes a sealing gasket 10, which is sealed and clamped between the water jacket 6 and the heat conducting part 531. The sealing gasket 10 can seal the gap between the water jacket 6 and the heat conducting part 531, thereby playing a sealing role. In this way, the heat conducting member 9 can be prevented from overflowing through the gap.

[0115] For example, see Fig.10 A sealing groove 6d is formed at one end of the water jacket 6 connected to the heat conducting part 531, and the sealing gasket 10 is arranged in the sealing groove 6d. The sealing groove 6d plays a limiting role to prevent the sealing gasket 10 from loosening and shifting.

[0116] In one embodiment, please refer to Fig.10 The end of the water jacket 6 connected to the heat conducting part 531 includes a sealing end surface 6d1, and the sealing end surface 6d1 seals against the heat conducting part 531. In this way, the sealing end surface 6d1 and the sealing gasket 10 play a role of multiple sealing.

[0117] In the description of this specification, the description with reference to the terms "an embodiment", "some embodiments" and "exemplary" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0118] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction. The above description is only a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A traction motor, characterized in that: include: Machine base; Two end cover assemblies, the two end cover assemblies are respectively arranged at two ends of the machine base along the axial direction to jointly define an accommodating cavity; A rotor assembly is disposed in the accommodating cavity; A rotating shaft, the rotating shaft is passed through the two end cover assemblies and the rotor assembly, and the rotating shaft can drive the rotor assembly to rotate; A stator assembly is disposed in the accommodating cavity and surrounds the circumference of the rotor assembly; Two water jackets are arranged in the accommodating cavity, and the two water jackets are respectively connected to the two end cover assemblies. The projection range of the stator assembly is located within the projection range of the water jacket, with the plane perpendicular to the axial direction as the projection plane, wherein the rotating shaft, the machine base, the two end cover assemblies and at least two of the two water jackets form a cooling channel, and the cooling channel is used to circulate a cooling medium.

2. The traction motor according to claim 1, characterized in that: The cooling channel includes a first cooling channel, the machine base includes a base body, the base body is formed with the first cooling channel, the stator assembly includes a stator core, and the first cooling channel is surrounded by a circumference of the stator core.

3. The traction motor according to claim 2, characterized in that: The first cooling channel includes two first flow guide chambers and multiple second flow guide chambers, the multiple second flow guide chambers are distributed along the circumferential direction and connected in sequence, the two first flow guide chambers are respectively connected to the second flow guide chamber at the head end and the second flow guide chamber at the tail end, the seat body is formed with a water inlet and a water outlet, the water inlet is connected to one of the first flow guide chambers, and the water outlet is connected to another first flow guide chamber.

4. The traction motor according to claim 2, characterized in that: The machine base includes a flow guide and a plurality of flow guide ribs, wherein the plurality of flow guide ribs are circumferentially spaced apart in the first cooling channel, two adjacent flow guide ribs whose ends are axially far apart are connected to the side wall of the first cooling channel, and two adjacent flow guide ribs whose ends are axially facing each other are spaced from the side wall of the first cooling channel, and the flow guide connects the two adjacent flow guide ribs.

5. The traction motor according to claim 1, characterized in that: The cooling channel includes a second cooling channel. The rotating shaft is formed with a cooling air inlet, a cooling air outlet and a second cooling channel extending in the axial direction. The second cooling channel communicates with the cooling air inlet and the cooling air outlet.

6. The traction motor according to claim 5, characterized in that: The rotating shaft is formed with a spiral groove communicating with the second cooling channel, and the spiral groove spirally extends along the peripheral side wall of the second cooling channel.

7. The traction motor according to claim 1, characterized in that: The cooling channel includes a third cooling channel, the end cover assembly includes a cover body and a bearing, the cover body is formed with the third cooling channel and a limiting cavity, the bearing is arranged in the limiting cavity and sleeved outside the rotating shaft, and the third cooling channel is surrounded by the outer periphery of the limiting cavity.

8. The traction motor according to claim 7, characterized in that: The end cover assembly includes a water baffle, which is arranged in the third cooling channel to separate the third cooling channel. The cover body is formed with a liquid inlet and a liquid outlet connected to the third cooling channel, and the liquid inlet and the liquid outlet are respectively located on both sides of the water baffle.

9. The traction motor according to claim 1, characterized in that: The cooling channel includes a fourth cooling channel, the stator assembly includes a stator core and a stator winding, the stator winding includes winding ends extending from both ends of the stator core along the axial direction, the water jacket is formed with a fourth cooling channel, and the fourth cooling channels of the two water jackets are respectively arranged around the circumference of the two winding ends.

10. The traction motor according to claim 9, characterized in that: The fourth cooling channel includes two first water guide chambers and multiple second water guide chambers, the multiple second water guide chambers are distributed along the circumferential direction and connected in sequence, the two first water guide chambers are respectively connected to the second water guide chamber at the head end and the second water guide chamber at the tail end, the water jacket is formed with a water inlet and a drain, the water inlet is connected to one of the first water guide chambers, and the drain is connected to another first water guide chamber.

11. The traction motor according to claim 9, characterized in that: The traction motor includes a water baffle and a plurality of water guide plates. The plurality of water guide plates are circumferentially spaced apart in the fourth cooling channel. Two adjacent water guide plates have their ends radially far apart connected to the side wall of the fourth cooling channel. Two adjacent water guide plates have their ends radially facing each other spaced from the side wall of the fourth cooling channel. The water baffle is located between two adjacent water guide plates. The water baffle has its ends radially connected to the side wall of the fourth cooling channel.

12. The traction motor according to claim 9, characterized in that: The end cover assembly includes a cover body, and the water jacket is formed with a water inlet and a water outlet communicated with the fourth cooling channel, and the water inlet and the water outlet penetrate the cover body.

13. The traction motor according to claim 9, characterized in that: The traction motor comprises a heat conductive member, which is arranged between the water jacket and the winding end, and is used to transfer heat generated by the winding end to the water jacket.

14. The traction motor according to claim 9, characterized in that: The stator assembly includes two stator pressing rings, and the two ends of the stator core along the axial direction are clamped between the two stator pressing rings. The stator pressing ring includes a heat conducting part, and the heat conducting part is used to transfer the heat generated by the stator core to the winding end.

15. The traction motor according to claim 14, characterized in that: The traction motor includes a sealing gasket, which is sealingly clamped between the water jacket and the heat conducting part.

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