Composite cooling system for motor

Abstract

The utility model relates to a composite cooling system for a motor. The motor comprises a housing, a stator and a rotor. The cooling system comprises a first cooling system and a second cooling system; the first cooling system is arranged on the shell and is configured to provide a channel for a first cooling medium to flow; the second cooling system comprises a heat exchange pipe and a second cooling channel; the heat exchange pipe is located in the first cooling system, one end is a second cooling medium inlet, and the other end communicates with one end of the second cooling channel. One end of the second cooling channel is a cooling medium outlet, and the second cooling channel is configured to provide a cooling medium for the stator and / or the rotor. The structure is simple, cooling is sufficient, and the effect of improving winding current density and power density of the motor is obvious. And the first cooling system is arranged in the shell structure and exchanges heat with the heat exchange pipe of the second cooling system, so that the heat conduction and heat dissipation efficiency is improved, and the overall miniaturization and light weight effects of the motor are remarkable.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, and in particular to a composite cooling system for motors. Background Technology

[0002] As a core component of new energy vehicles, miniaturization and high power density have become the focus of research for electric motors. With the gradual increase in requirements for winding current density and overall power density, motor structures are becoming more compact, leading to a rapid increase in motor winding and operating temperatures. This results in many negative impacts on the motor, such as gradually increasing the resistivity of the stator windings, causing increased motor losses; causing the winding insulation layer to fail, leading to short circuits between conductors and posing a risk of motor breakdown; and demagnetization occurring if the permanent magnet temperature exceeds the allowable range. Therefore, effective heat dissipation and cooling of permanent magnet synchronous motors, and controlling the temperature of various motor components within a safe range, has become an issue that cannot be ignored.

[0003] Due to the limited space at the ends, current stator oil-immersed cooling motors often cool their end windings by completely immersing them in oil or by adding an oil spray ring at the top. When completely immersed, the cooling oil flows slowly within the cavity, resulting in poor convective heat transfer at the fluid-solid interface, and the end windings are not actually adequately cooled. When oil is sprayed only at the top, the cooling medium can only contact the outer surface of the end windings, making it difficult to cool the inner and central parts of the windings, where heat dissipation is even worse.

[0004] The patent document with authorization announcement number CN118920772A discloses an oil spray ring for the end winding of a motor and a motor using stator immersion oil cooling. The oil spray ring includes: a circular ring body; the outer diameter of which is smaller than the outer diameter of the stator core; oil spray teeth evenly distributed along the circumference on the inner surface of one end of the circular ring body; the oil spray teeth extend radially, and the end away from the circular ring body is a closed structure; the oil spray teeth are hollow structures, and oil spray holes are provided on their sides; an oil inlet is provided at the connection between the oil spray teeth and the circular ring body; after assembly, the end of the circular ring body with oil spray teeth is in contact with the axial end face of the stator core, and the oil spray teeth are located between adjacent stator slots; after the cooling medium flows out from the stator core, it flows into the interior of the oil spray teeth through the oil inlet, and the oil spray holes include circumferential oil spray holes that guide the cooling medium to spray out circumferentially and axial oil spray holes that guide the cooling medium to spray out axially. This structure is beneficial for improving the cooling effect of the end windings, but the structure of the oil injection ring will inevitably increase the axial dimension of the motor, which is detrimental to the compactness and high power density of the motor. Furthermore, the stator winding end dimensions of this design will inevitably increase, leading to an increase in the axial dimension and weight of the motor, which will inevitably affect the power density of the motor. The above problems urgently need to be solved. Utility Model Content

[0005] This utility model discloses a composite cooling system for motors, which aims to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solution:

[0007] This invention provides a composite cooling system for an electric motor, the motor comprising a housing, a stator, and a rotor; the cooling system comprising a first cooling system and a second cooling system; the first cooling system is disposed in the housing and configured to provide a channel for the flow of a first cooling medium; the second cooling system comprises a heat exchange tube and a second cooling channel; the heat exchange tube is located within the first cooling system, with one end serving as an inlet for the second cooling medium and the other end connected to one end of the second cooling channel; one end of the second cooling channel serves as an outlet for the cooling medium, and the second cooling channel is configured to provide a cooling medium to the stator and / or the rotor.

[0008] In the composite cooling system for motors of this utility model, the housing includes an outer shell, a first end cap, and a second end cap; the first cooling system includes a plurality of first flow channels disposed within the outer shell wall of the housing, a first connecting groove disposed on the surface of the first end cap facing the housing, and a second connecting groove disposed on the surface of the second end cap facing the housing; the plurality of first flow channels are connected in series through the first connecting groove and the second connecting groove.

[0009] In the composite cooling system for motors of this utility model, the first cooling system further includes a first inlet and a first outlet; the first inlet is disposed in the housing and communicates with one of the adjacent first flow channels; the first outlet is disposed in the housing and communicates with the other of the adjacent first flow channels; one end of the first flow channel where the first inlet and the first outlet are disposed is closed.

[0010] In the composite cooling system for motors of this invention, the first flow channel extends along the rotor axis and has a long strip shape in cross-section perpendicular to the rotor axis.

[0011] In the composite cooling system for an electric motor of this invention, the second cooling channel includes a second flow channel disposed within the outer wall of the housing, a third flow channel disposed on the rotor shaft, and a first discharge member disposed on the outer side of the housing; one end of the second flow channel is connected to the heat exchange tube, and the other end is connected to one end of the third flow channel; the other end of the third flow channel forms a first spray outlet for spraying and cooling the stator and / or the rotor; the first spray outlet is connected to the inner cavity of the housing; the first discharge member is connected to the inner cavity of the housing and is used to discharge the cooling medium inside the inner cavity of the housing.

[0012] In the composite cooling system for motors of this utility model, the second cooling channel includes a second flow channel inside the outer wall of the housing and a fourth flow channel disposed on the stator; one end of the fourth flow channel is connected to the heat exchange tube, and the other end is a second spray outlet for spray cooling the stator windings of the stator; the second flow channel is connected to the fourth flow channel.

[0013] In the composite cooling system for motors of this invention, the fourth flow channel includes an annular third connecting groove and a plurality of fourth connecting grooves disposed on the outer peripheral surface of the stator core of the stator; the third connecting groove connects to the heat exchange tube; one end of each of the fourth connecting grooves passes through the third connecting groove, and the other end passes through the end face of the stator core to form the second spray outlet; the second flow channel connects to the third connecting groove.

[0014] In the composite cooling system for motors of this invention, the second spray outlet is oriented at an angle to the axial direction of the stator core.

[0015] In the composite cooling system for motors of this invention, the fourth flow channel further includes a second connecting hole; the second connecting hole connects the heat exchange tube and the third connecting groove.

[0016] In the composite cooling system for motors of this utility model, the second flow channel includes a first section and a second section disposed within the outer casing wall, and a third section disposed on the first end cover or the second end cover of the casing; one end of the first section is connected to the inner surface of the outer casing, and the other end is connected between the two ends of the second section; one end of the second section is closed, and the other end is connected to the end face of the outer casing to communicate with one end of the third section; the other end of the third section is connected to the third flow channel.

[0017] In the composite cooling system for motors of this invention, the third section having a tapered flared structure on one side connected to the third flow channel.

[0018] In the composite cooling system for motors of this invention, the first spray outlet includes a bearing spray outlet, a winding spray outlet, and a core spray outlet; the bearing spray outlet faces the bearing of the rotor and is set at an angle to the bearing axis.

[0019] In the composite cooling system for motors of this invention, the rotor core is provided with a hollow structure extending through both ends along the axial direction and a first connecting hole connecting the spray nozzle of the core and the hollow structure.

[0020] In the composite cooling system for motors of this utility model, the first discharge component is a trough structure, which is sealed to the outer surface of the outer shell to form a buffer space; the buffer space is connected to the inner cavity of the shell and has a second outlet for discharging the cooling medium from the buffer space.

[0021] The technical solution adopted in this utility model can achieve the following beneficial effects:

[0022] This utility model mainly provides a composite cooling system for motors. Based on the first cooling system and the second cooling system, the motor housing, stator and rotor are cooled respectively. The configuration is simple and the cooling is sufficient. It has a significant effect on improving the winding current density and power density of the motor. Furthermore, by setting the first cooling system inside the housing structure and exchanging heat with the heat exchange tube of the second cooling system, the efficiency of heat conduction and heat dissipation is improved, resulting in significant miniaturization and weight reduction of the motor as a whole. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of this utility model. The illustrative embodiments of this utility model and their descriptions explain this utility model and do not constitute an improper limitation of this utility model. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of a composite cooling system for an electric motor according to the present invention.

[0025] Figure 2 This is one of the structural schematic diagrams of the outer shell of this utility model;

[0026] Figure 3 This is one of the cross-sectional structural schematic diagrams of a composite cooling system for an electric motor according to the present invention;

[0027] Figure 4 This is the second structural schematic diagram of the outer shell of this utility model with the first flow channel set;

[0028] Figure 5 This is a schematic diagram of the structure of the first connecting groove of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the second connecting groove of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the second end cap of this utility model;

[0031] Figure 8 This is a schematic diagram of the rotor with the first spray outlet of this utility model.

[0032] Figure 9 This is a schematic diagram of the structure of the rotating shaft for setting the first spray outlet of this utility model.

[0033] Figure 10 This is one of the cross-sectional structural schematic diagrams of the rotating shaft for setting the first spray outlet of this utility model;

[0034] Figure 11 This is the second cross-sectional structural schematic diagram of the rotating shaft for setting the first spray outlet of this utility model.

[0035] Figure 12 This is a second cross-sectional structural schematic diagram of a composite cooling system for an electric motor according to the present invention;

[0036] Figure 13 This is a schematic diagram of the heat exchange tube of this utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Shell; 101. Outer shell; 102. First end cover; 103. Second end cover; 200. Stator; 201. Stator winding; 202. Stator core; 300. Rotor; 301. Shaft; 302. Bearing; 303. Rotor core; 304. Hollowed-out structure; 305. First connecting hole; 400. First cooling system; 401. First flow channel; 402. First connecting groove; 403. Second connecting groove; 404. First inlet; 405. First outlet; 500. Second cooling system; 501. Heat exchange tube; 502. Second cooling channel; 5 021. Second flow channel; 50211. First section; 50212. Second section; 50213. Third section; 5022. Third flow channel; 5023. First discharge part; 5024. First spray outlet; 50241. Bearing spray nozzle; 50242. Winding spray nozzle; 50243. Iron core spray nozzle; 5025. Fourth flow channel; 50251. Third connecting groove; 50252. Fourth connecting groove; 50253. Second connecting hole; 5026. Second spray outlet; 5207. Buffer space; 5208. Second outlet; 5029. Second inlet. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this utility model, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly stated otherwise.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0041] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] To address the problems existing in the prior art, embodiments of this application provide a composite cooling system for motors.

[0043] like Figures 1-3 As shown, a composite cooling system for an electric motor is disclosed. The motor includes a housing 100, a stator 200, and a rotor 300. The cooling system includes a first cooling system 400 and a second cooling system 500. The first cooling system 400 is disposed within the housing 100, i.e., a flow channel is formed within the housing 100 to form the first cooling system 400, and is configured to provide a channel for the flow of a first cooling medium. The second cooling system 500 includes a heat exchange tube 501 and a second cooling channel 502. The heat exchange tube 501 is located within the first cooling system 400, with one end serving as an inlet for the second cooling medium and the other end connected to one end of the second cooling channel 502. One end of the second cooling channel 502 serves as a cooling medium outlet, and the second cooling channel 502 is configured to provide a cooling medium to the stator 200 and / or the rotor 300. Specifically, the media flowing in the first cooling system 400 and the second cooling system 500 may be the same or different. Preferably, the medium in the first cooling system 400 is water, and the medium in the second cooling system 500 is oil.

[0044] This utility model discloses a composite cooling system for an electric motor. Based on a first cooling system 400 and a second cooling system 500, the system cools the motor housing, stator, and rotor respectively. The system has a simple configuration and provides sufficient cooling, which significantly improves the winding current density and power density of the motor. Furthermore, by placing the first cooling system 400 within the housing 100 structure and exchanging heat with the heat exchange tube 501 of the second cooling system 500, the efficiency of heat conduction and heat dissipation is improved, resulting in significant miniaturization and weight reduction of the overall motor.

[0045] In some preferred embodiments, the flow directions of the medium in the first cooling system 400 and the heat exchange tube 501 are opposite; this improves the heat exchange effect; specifically, the heat exchange tube 501 can be arranged as follows: Figure 13 As shown.

[0046] In some preferred embodiments, such as Figures 1-6 As shown, the housing 100 includes an outer shell 101, a first end cap 102, and a second end cap 103. Specifically, the outer shell 101 is a cylindrical body with openings at the top and bottom, and the first end cap 102 and the second end cap 103 are respectively disposed on the top and bottom openings. The first cooling system 400 includes a plurality of first flow channels 401 disposed in the wall of the outer shell 101 of the housing 100, a first connecting groove 402 disposed on the surface of the first end cap 102 facing the housing 100, and a second connecting groove 403 disposed on the surface of the second end cap 103 facing the housing 100. The plurality of first flow channels 401 are connected in series through the first connecting groove 402 and the second connecting groove 403.

[0047] Preferably, the first flow channel 401 extends along the axial direction of the rotor 300, and its cross-sectional shape perpendicular to the axial direction of the rotor 300 is elongated; based on this, the flow cross-sectional area of ​​the first flow channel 401 is larger, thereby increasing the heat exchange with the outer shell 101 and the stator 200 inside the outer shell 101, and improving the heat exchange efficiency.

[0048] In some preferred embodiments, such as Figure 2 As shown, the first cooling system 400 also includes a first inlet 404 and a first outlet 405; the first inlet 404 is disposed on the outer casing 101 and is connected to one of the adjacent first flow channels 401; the first outlet 405 is disposed on the outer casing 101 and is connected to the other of the adjacent first flow channels 401; one end of the first flow channel 401 with the first inlet 404 and the first outlet 405 is closed; thus, after the cooling medium enters the first flow channel 401 through the first inlet 404, it flows through multiple first flow channels 401, the first connecting groove 402 and the second connecting groove 403 in sequence, and then flows out through the first outlet 405, making the flow channel longer to improve the heat exchange with the casing 100.

[0049] In some preferred embodiments, such as Figure 3As shown, the second cooling channel 502 includes a second flow channel 5021 disposed within the wall of the outer shell 101 of the housing 100, a third flow channel 5022 disposed on the rotating shaft 301 of the rotor 300, and a first discharge member 5023 disposed on the outside of the outer shell 101; one end of the second flow channel 5021 is connected to the heat exchange tube 501, and the other end is connected to one end of the third flow channel 5022; the other end of the third flow channel 5022 forms a first spray outlet 5024 for spraying and cooling the stator 200 and / or the rotor 300; the first spray outlet 5024 is connected to the inner cavity of the housing 100, and the first discharge member 5023 is connected to the inner cavity of the housing 100 and is used to discharge the cooling medium in the inner cavity of the housing 100; based on the first spray outlet 5024 disposed on the rotating shaft 301, spray cooling is performed on the part of the rotor 300 near the rotating shaft 301 to improve the cooling effect and enhance the overload capacity of the motor.

[0050] Preferably, such as Figure 7 As shown, the second cooling channel 502 also includes a fourth flow channel 5025 disposed on the stator 200; one end of the fourth flow channel 5025 is connected to the heat exchange tube 501, and the other end is a second spray outlet 5026 for spray cooling of the stator winding 201 of the stator 200; the second flow channel 5021 is connected to the fourth flow channel 5025; based on the cooling of the stator 200 by the fourth flow channel 5025, the uniformity of cooling is further improved.

[0051] More preferably, such as Figure 7 As shown, the fourth flow channel 5025 includes an annular third connecting groove 50251 and multiple fourth connecting grooves 50252 disposed on the outer peripheral surface of the stator core 202 of the stator 200; the third connecting groove 50251 connects to the heat exchange tube 501; one end of each fourth connecting groove 50252 passes through the third connecting groove 50251, and the other end penetrates through the end face of the stator core 202 to form a second spray outlet 5026; the second flow channel 5021 connects to the third connecting groove 50251; based on the fourth flow channel 5025 formed by the third connecting groove 50251 and the fourth connecting groove 50252 and the inner wall of the outer casing 101, on the one hand, cooling of the stator core 202 is achieved, and on the other hand, the cooling effect of the first flow channel 5025 is improved. The heat exchange efficiency between the cooling systems 400 is improved, and the stator winding 201 is sprayed with a second spray outlet 5026 formed at the end of the fourth connecting groove 50252, which further improves the uniformity of cooling of the stator winding 201 and enhances the cooling effect. Specifically, multiple fourth connecting grooves 50252 are spaced apart along the extension direction of the third connecting groove 50251 and located on both sides of the third connecting groove 50251 to cool the stator winding 201 on both sides, further improving the uniformity of heat dissipation of the stator core 202, thereby reducing the temperature difference between the stator core 202 and the outer shell 101, and avoiding excessive temperature difference between the two to prevent excessive difference in thermal expansion and contraction, which would affect the service life of the structure.

[0052] More preferably, the second spray outlet 5026 is oriented at an angle to the axial direction of the stator core 202 to improve the cooling effect on the stator winding 201.

[0053] More preferably, the second spray outlet 5026 is oriented at an angle A of 30° with the axial direction of the stator core 202. This improves the spraying of the stator winding 201 and reduces flow resistance, thereby increasing the heat exchange efficiency with the first cooling system.

[0054] In some preferred embodiments, such as Figure 4 and Figure 12 As shown, the fourth flow channel 5025 also includes a second connecting hole 50253; the second connecting hole 50253 connects the heat exchange tube 501 and the third connecting groove 50251; more preferably, the second connecting hole 50253 includes a countersunk hole and a side hole, one end of the countersunk hole connects to the third connecting groove 50251, and the other end connects to the outside, and is provided with a plug; one end of the side hole connects to the countersunk hole, and the other end connects to the heat exchange tube 501; thereby, coolant can be added to the second cooling system 500.

[0055] In some preferred embodiments, such as Figure 3 As shown, the second flow channel 5021 includes a first section 50211, a second section 50212 disposed within the wall of the housing 101, and a third section 50213 disposed on the first end cover 102 or the second end cover 103 of the housing 100. One end of the first section 50211 connects to the inner surface of the housing 101, and the other end connects to the two ends of the second section 50212. One end of the second section 50212 is closed, and the other end connects to the end face of the housing 101 to communicate with one end of the third section 50213. The other end of the third section 50213 connects to the third flow channel 5022. The first section 50211 and the second section 50212 of the second flow channel 5021 on the housing 101 reduce the space volume occupied by the cooling system and increase the heat exchange with the first cooling system 400. This further reduces the temperature of the cooling medium in the second cooling system 500, thereby improving the cooling effect on the stator 200 and the rotor 300.

[0056] Preferably, the second segment 50212 is approximately the same as the axial width of the outer shell 101, and the third segment 50213 is approximately in the shape of “]”.

[0057] Preferably, the end of the second segment 50212 protrudes from the end face of the outer casing 101 and is accommodated in the third segment 50213; thereby facilitating the docking between the outer casing 101 and the first end cap 102 or the second end cap 103.

[0058] Preferably, the side of the third section 50213 that connects to the third flow channel 5022 has a conical flared structure. Based on this, when the cooling medium flows into the third section 50213, it can flow along the inner wall of the third section 50213, thereby achieving an oil film seal with the third flow channel 5022. After entering the third flow channel 5022, it is thrown out through the first spray outlet 5024 by centrifugal force, forming a low-pressure area in the third flow channel 5022, which promotes the flow of the cooling medium into the third flow channel 5022.

[0059] Preferably, such as Figure 9 As shown, the first spray outlet 5024 includes a bearing spray outlet 50241, a winding spray outlet 50242, and an iron core spray outlet 50243; the bearing spray outlet 50241 faces the bearing 302 of the rotor 300 and is set at an angle to the axial direction of the bearing 302.

[0060] Preferably, there are multiple bearing spray nozzles 50241, winding spray nozzles 50242, and core spray nozzles 50243, all evenly distributed along the circumference of the rotating shaft 301 to improve the uniformity of spraying.

[0061] More preferably, such as Figure 10 and Figure 11 As shown, the axial angle between the bearing spray nozzle 50241 and the bearing 302 is 40° or 60°. When spraying the right bearing, angle B can be selected as 60°; when spraying the left bearing, angle C is 40°; other angles can also be set according to the working conditions.

[0062] In some preferred embodiments, such as Figure 8 As shown, the rotor core 303 of the rotor 300 is provided with a hollow structure 304 extending through both ends along the axial direction and a first connecting hole 305 connecting the core spray port 50243 and the hollow structure 304; specifically, the first connecting hole 305 is provided in a one-to-one correspondence with the core spray port 50243; based on the hollow structure 304 provided in the rotor core 303 and the hollow structure 304 connected to the core spray port 50243 through the first connecting hole 305, the cooling medium can be sprayed onto the inner surface of the hollow structure 304, thereby improving the cooling effect on the rotor core 303.

[0063] In some preferred embodiments, such as Figures 2-4As shown, the first discharge component 5023 is a trough structure, which is sealed to the outer surface of the outer shell 101 to form a buffer space 5027. The buffer space 5027 is connected to the inner cavity of the shell 100 and has a second outlet 5028 for discharging the cooling medium from the buffer space 5027. The second inlet 5029 is provided on the outer shell 101 and is connected to the heat exchange tube 501. Specifically, the first discharge component 5023 is provided at the bottom of the outer shell 101 (the motor shaft is set horizontally). Thus, the cooling medium flows into the buffer space 5027 by its own weight and is then discharged through the second outlet 5028.

[0064] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A composite cooling system for an electric motor, the electric motor comprising a housing, a stator, and a rotor; characterized in that, The cooling system includes a first cooling system and a second cooling system; The first cooling system is disposed in the housing and configured to provide a channel for the flow of the first cooling medium; The second cooling system includes heat exchange tubes and a second cooling channel; The heat exchange tube is located within the first cooling system, with one end serving as the inlet for the second cooling medium and the other end connected to one end of the second cooling channel. One end of the second cooling channel is a cooling medium outlet, and the second cooling channel is configured to provide cooling medium to the stator and / or the rotor.

2. The composite cooling system for an electric motor according to claim 1, characterized in that, The housing includes an outer shell, a first end cap, and a second end cap; The first cooling system includes a plurality of first flow channels disposed within the outer wall of the housing, a first connecting groove disposed on the surface of the first end cap facing the housing, and a second connecting groove disposed on the surface of the second end cap facing the housing. Multiple first flow channels are connected in series through the first connecting slot and the second connecting slot.

3. The composite cooling system for an electric motor according to claim 2, characterized in that, The first cooling system also includes a first inlet and a first outlet; The first inlet is disposed in the outer casing and communicates with one of the adjacent first flow channels; The first outlet is disposed in the housing and communicates with another of the adjacent first flow channels; The first flow channel, which has the first inlet and the first outlet, is closed at one end.

4. The composite cooling system for an electric motor according to claim 2, characterized in that, The first flow channel extends along the rotor axis and has a long strip shape in cross-section perpendicular to the rotor axis.

5. The composite cooling system for an electric motor according to claim 1, characterized in that, The second cooling channel includes a second flow channel disposed within the outer wall of the housing, a third flow channel disposed on the rotor shaft, and a first discharge component disposed on the outer side of the housing; One end of the second flow channel is connected to the heat exchange tube, and the other end is connected to one end of the third flow channel; The other end of the third flow channel forms a first spray outlet for spraying and cooling the stator and / or the rotor; the first spray outlet is connected to the inner cavity of the housing; The first discharge component is connected to the inner cavity of the housing and is used to discharge the cooling medium inside the inner cavity of the housing.

6. The composite cooling system for an electric motor according to claim 5, characterized in that, The second flow channel includes a first section and a second section disposed within the outer casing wall, and a third section disposed on the first end cap or the second end cap of the casing; One end of the first segment is connected to the inner surface of the outer shell, and the other end is connected between the two ends of the second segment; The second segment is closed at one end and connected to the end face of the outer shell at the other end to communicate with one end of the third segment; The other end of the third segment is connected to the third flow channel.

7. The composite cooling system for an electric motor according to claim 6, characterized in that, The third section, which connects to the third flow channel, has a tapered flared structure on one side.

8. The composite cooling system for an electric motor according to claim 5, characterized in that, The first spray outlet includes a bearing spray outlet, a winding spray outlet, and an iron core spray outlet; The bearing spray nozzle is directed toward the bearing of the rotor and is set at an angle to the bearing axis.

9. The composite cooling system for an electric motor according to claim 8, characterized in that, The rotor core of the rotor is provided with a hollow structure that extends through both ends along the axial direction and a first connecting hole that connects the spray nozzle of the core and the hollow structure.

10. The composite cooling system for an electric motor according to claim 5, characterized in that, The first discharge component is a trough structure, which is sealed to the outer surface of the outer shell to form a buffer space; The buffer space is connected to the inner cavity of the housing and has a second outlet for discharging the cooling medium from the buffer space.

11. The composite cooling system for an electric motor according to claim 1, characterized in that, The second cooling channel includes a second flow channel within the outer wall of the housing and a fourth flow channel disposed on the stator; One end of the fourth flow channel is connected to the heat exchange tube, and the other end is a second spray outlet for spray cooling the stator winding of the stator. The second flow channel is connected to the fourth flow channel.

12. The composite cooling system for an electric motor according to claim 11, characterized in that, The fourth flow channel includes an annular third connecting groove and a plurality of fourth connecting grooves disposed on the outer peripheral surface of the stator core of the stator; The third connecting groove is connected to the heat exchange tube; One end of each of the fourth connecting slots passes through the third connecting slot, and the other end passes through the end face of the stator core to form the second spray outlet; The second flow channel is connected to the third connecting groove.

13. The composite cooling system for an electric motor according to claim 12, characterized in that, The second spray outlet is oriented at an angle to the axial direction of the stator core.

14. The composite cooling system for an electric motor according to claim 12, characterized in that, The fourth flow channel also includes a second connecting hole; The second connecting hole connects the heat exchange tube and the third connecting groove.

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