Motor cooling structure, motor, and vehicle

Abstract

The present application discloses a motor cooling structure, a motor, and a vehicle. The motor cooling structure comprises: a stator core, having an axially arranged central bore, a stator slot, and a cooling channel. The stator slots have closed inner walls, and the cooling channel is disposed in the stator yoke of the stator core; a cooling jacket is disposed at the two axial ends of the stator core. The cooling jacket defines an open annular cavity. Both ends of the winding extend outside the stator slots and are disposed in the annular cavity. The annular cavity is in fluid communication with the cooling channel, and the annular cavity and the cooling channel form a coolant flow path that is fluidly isolated from the central bore. The motor cooling structure disclosed in the present invention is beneficial for fully cooling the end windings and the windings in the slots, and makes the end cooling of the windings more uniform, improving the cooling effect of the motor; and it avoids the cooling oil from entering the air gap between the stator and the rotor, which may otherwise lead to large oil churning losses of the motor and low operating efficiency.

Description

[0001] MOTOR COOLING STRUCTURE, MOTOR, AND VEHICLE

[0002] Technical Field

[0003] The present application relates to the technical field of motor preparation, and in particular, to a motor cooling structure, a motor, and a vehicle.

[0004] Background

[0005] With the continuous development of the manufacturing technology of new energy vehicles, the increase in the unit heat consumption of the vehicle's electric drive system poses increasingly stringent requirements on the cooling system of the motor.

[0006] The cooling structure of the existing electric drive system has difficulty in ensuring that the end portions of the windings are uniformly and fully cooled when cooling the end portions of the windings. Moreover, when the motor operates at a high speed, the larger the amount of the cooling liquid and the faster the flow rate, the greater the oil churning loss generated by the motor, and the lower the operating efficiency of the motor.

[0007] Summary

[0008] In order to solve at least one technical problem in the prior art, there is provided a motor cooling structure, a motor, and a vehicle. The technical solutions are as follows:

[0009] In accordance with a first aspect, there is provided a motor cooling structure, comprising: a stator core, having an axially arranged central bore, a stator slot, and a cooling channel, wherein the central bore is configured to accommodate a rotor, the stator slot is configured to accommodate a winding, and the cooling channel is disposed in a stator yoke of the stator core; a cooling jacket, disposed at two axial ends of the stator core and defining an open annular cavity, wherein two ends of the winding extends outside the stator slot and are disposed in the annular cavity, and the annular cavity is in fluid communication with the cooling channel to form a coolant flow path fluidly isolated from the central bore.

[0010] Further, both the stator slot and the cooling channel have open ends and circumferentially closed inner walls.

[0011] Further, the cooling jacket comprises an inner sidewall and a top wall, wherein the inner sidewall and the top wall enclose a circumferentially open annular cavity, an end of the inner sidewall adjacent to an open side abuts an axial end of the stator core, and an end of the top wall adjacent to the open side abuts an inner wall of a motor housing.

[0012] Further, the cooling jacket comprises an inner sidewall, an outer sidewall, and a top wall, wherein the inner sidewall, the outer sidewall, and the top wall enclose a circumferentially open annular cavity, the open side of the annular cavity faces an axial end of the stator core, and ends of the inner sidewall and the outer sidewall adjacent to the open side about the axial end of the stator core.

[0013] Further, in a radial direction of the stator core, the stator slots are disposed radially outward of the central bore, and the inner sidewall of the cooling jacket is disposed between the stator slots and the central bore.

[0014] Further, the outer sidewall of the cooling jacket at one axial end of the stator core has a liquid inlet, and the top wall of the cooling jacket at the other axial end has a liquid outlet; wherein in an installed state of the motor, the liquid outlet is positioned adjacent to an upper end of the motor.

[0015] Further, the motor is a flat wire motor, and the windings are flat copper wires.

[0016] Further, a sealing gasket or adhesive sealing layer is disposed between the cooling jacket and at least one of the stator core and / or an inner wall of the motor housing.

[0017] In accordance with a second aspect, there is provided a motor, comprising: a shaft; a rotor sleeved on the shaft; the motor cooling structure according to any one of embodiments in the first aspect, wherein the stator core is sleeved on the rotor and coaxially arranged with the shaft; and a housing defining the shaft, the rotor, and the motor cooling structure, wherein two ends of the shaft extend outside the housing, and the housing maintains the shaft, the rotor, and the motor cooling structure in a clamped state.

[0018] In accordance with a third aspect, there is provided a vehicle, comprising the motor as described in the second aspect.

[0019] The beneficial effects brought by the technical solutions provided by the embodiments of the present invention at least include:

[0020] The motor cooling structure disclosed in the present invention is provided with a cooling channel along the axial direction of the stator core, and the cooling jackets at both ends of the stator core are communicated through the cooling channel, which is beneficial for fully cooling the end windings and the windings in the slots, and makes the end cooling of the windings more uniform.

[0021] The motor cooling structure disclosed in the present invention is provided with stator slots having closed inner sides on the stator core, which avoids the cooling oil from entering the air gap between the stator and the rotor, thereby preventing the motor from having large oil churning losses and low operating efficiency.

[0022] Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0024] FIG. 1 is a schematic structural diagram of a motor provided in an embodiment of the present invention;

[0025] FIG. 2 is a schematic cross-sectional view taken along the line C-C of the motor cooling structure provided in an embodiment of the present invention;

[0026] FIG. 3 is a schematic cross-sectional view taken along the line B-B of the motor cooling structure provided in an embodiment of the present invention;

[0027] FIG. 4 is an enlarged view of the structure of the region D in FIG. 1 ;

[0028] FIG. 5 is a cooling path of the motor cooling structure provided in an embodiment of the present invention;

[0029] FIG. 6 is a schematic structural diagram of a first cooling jacket provided in an embodiment of the present invention;

[0030] FIG. 7 is a schematic structural diagram of a second cooling jacket provided in an embodiment of the present invention;

[0031] FIG. 8 is a schematic three-dimensional structural diagram of a stator core provided in an embodiment of the present invention; and

[0032] FIG. 9 is a schematic structural diagram of the stator slots and the cooling channel in the stator core.

[0033] In the figures: Motor 100;

[0034] Stator core 10; Cooling jacket 20; Winding 30; Shaft 40; Rotor 50; Housing 60;

[0035] Stator slot 11; Cooling channel 12; Central bore 13; First cooling jacket 201 ; Second cooling jacket 202; Annular cavity 21 ; Outer sidewall 22; Inner sidewall 23; Top wall 24; Liquid inlet 25; Liquid outlet 26; Notch 61 ; First notch 611 ; Second notch 612.

[0036] Detailed Description

[0037] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] It should be noted that the expressions of "first" and "second" used in the embodiments of the present invention are all used to distinguish two entities with the same name but different identities or different parameters. Obviously, "first" and "second" are only for the convenience of expression and should not be construed as limitations on the embodiments of the invention. Subsequent embodiments will not elaborate on this one by one.

[0039] In the electric drive system, the stator core 10 is provided with a plurality of stator slots 11 for installing the windings 30. The stator slots 11 are accommodating cavities with open ends facing the inner side of the stator core 10, and the windings 30 extend from both ends of the stator slots 11 into the oil injection rings arranged at both ends of the stator core 10. Currently, the cooling structure of the electric drive system forces the oil into the oil injection rings through opening oil holes in the stator yoke to perform forced cooling on the stator core 10 and the end portions of the windings 30, or directly supplies the coolant to the oil injection rings to cool the end portions of the windings 30.

[0040] The above cooling structure makes it difficult to ensure that the end copper wires are fully cooled, and the coolant easily enters the air gap between the stator core 10 and the core of the rotor 50. When the motor operates at a high speed, a large amount of coolant enters the air gap between the stator and the rotor 50, resulting in large oil churning losses and low efficiency of the motor.

[0041] FIG. 1 is a schematic structural diagram of a motor provided by the present invention, FIG. 2 is a schematic cross-sectional structural diagram taken along the line C-C in FIG. 1 , and FIG. 3 is a schematic cross-sectional structural diagram taken along the line B-B in FIG. 1. As shown in FIG. 2, an embodiment of the present invention provides a motor cooling structure, including: a stator core 10 and a cooling jacket 20. Among them, as shown in FIG. 3 and FIG. 8, stator slots 11 , a cooling channel 12, and a central bore 13 are formed in the stator core 10. The stator slots 11 , the cooling channel 12, and the central bore 13 are all arranged along the axial direction of the stator core 10. The cooling channel 12 is arranged in the stator yoke of the stator core 10, and the stator yoke is the area from the outer edge of the stator slots 11 to the outer edge of the stator core 10. A rotor is arranged in the central bore 13, and a winding 30 is arranged in the stator slots 11. The cooling jacket 20 is arranged at the two ends of the stator core 10. The cooling jacket 20 has an open annular cavity 21 , and both ends of the winding 30 extend outside the stator slots 11 and are arranged in the annular cavity 21. The annular cavity 21 of the cooling jacket 20 is in communication with the cooling channel 12 in the stator core 10 to form a coolant flow path of the motor, and the coolant flow path is fluidly isolated from the central bore 13.

[0042] As described above, in one case, the annular cavity 21 of the cooling jacket 20 may have a plurality of open ends, which are respectively in communication with the stator slots 11 and the cooling channel 12 to improve the tightness of the connection between the cooling jacket 20 and the stator core 10. In another case, the annular cavity of the cooling jacket 20 can be a circumferentially open annular space, which is directly in communication with the stator slots 11 and the cooling channel 12 and is closely connected to the stator core 10 through a sealing layer.

[0043] In one embodiment, as shown in FIG. 8, the stator slots 11 and the cooling channel 12 have open ends and circumferentially closed inner walls. FIG. 4 is an enlarged view of the region D in FIG. 1. In the figure, the end of the cooling jacket 20 is closely joined to the end of the stator core 10, and the inner wall of the stator slot 11 is closed, so as to form a sealed coolant flow path with the cooling jackets 20 at both ends in the circumferential direction of the stator core 10.

[0044] Exemplarily, as shown in FIGS. 1 -3, the motor is a flat wire motor, and the winding are flat copper wires. The stator core 10 is a cylinder and has two ends along the axial direction. A first cooling jacket 201 and a second cooling jacket 202 are respectively arranged at the two ends of the stator core 10. The stator core 10 has stator slots 11 and a cooling channel 12 arranged axially. The stator slots 11 are closed slots, and their inner walls have a circumferentially closed structure. The cooling channel 12 is arranged in the stator yoke of the stator core 10. Specifically, in the radial direction of the stator core 10, the cooling channel 12 is arranged outside the stator slots 11. Both the first cooling jacket 201 and the second cooling jacket 202 have an annular cavity 21 that opens towards the stator core 10. Both ends of the winding 30 extend from the stator slots 11 into the annular cavity 21 , and the open end of the cooling channel is in communication with the annular cavity. FIG. 5 is a schematic diagram of the coolant flow path of the motor cooling structure, and the direction indicated by the arrow in the figure represents the flow direction of the coolant. As shown in FIG. 5, the annular cavity

[0045] 21 and the cooling channel 12 form the coolant flow path of the motor. The motor coolant enters the annular cavity 21 of the first cooling jacket 201 and flows circumferentially along the ring therein. At the same time, the coolant in the first cooling jacket 201 enters the second cooling jacket 202 through the cooling channel 12 and flows circumferentially along the annular cavity 21 in the second cooling jacket 202. Thus, the cooling of the winding 30 is set as an independent cooling circuit, enabling the coolant to fully and uniformly cool the end portions of the winding 30. In the embodiment of the present invention, the stator slots 11 on the stator core 10 are closed slots (with circumferentially closed inner walls), which is different from the existing stator slots on the stator core 10 that open towards the inner side of the stator core 10 (the inner walls form an open end and have a groovelike structure), avoiding the coolant in the cooling jacket 20 from entering the air gap between the stator and the rotor 50 through the open end of the wire slot, which is beneficial to reducing the oil churning loss of the motor and improving the operating efficiency of the motor.

[0046] In one embodiment, in order to ensure that the cooling jacket 20 does not interfere with the winding 30, the cooling jacket 20 is made of an insulating material.

[0047] In one embodiment, as shown in FIGS. 6 and 7, the cooling jacket 20 includes: an outer sidewall 22, an inner sidewall 23, and a top wall 24. The top wall 24 is annular. The outer sidewall 22 is coaxially sleeved outside the inner sidewall 23 with respect to the shaft 40. The outer side and the inner side of the top wall 24 are respectively vertically connected to the ends of the outer sidewall

[0048] 22 and the inner sidewall 23. The outer sidewall 22, the inner sidewall 23, and the top wall 24 form the annular cavity 21 with an open end of the cooling jacket 20. Specifically, when the cooling jacket 20 is installed at the end of the stator core 10, both the end of the outer sidewall 22 and the end of the inner sidewall 23 abut against the stator core 10, and the open end of the cooling jacket 20 faces the stator core 10, so that the annular cavity 21 of the cooling jacket 20 is in communication with the stator slots 11 in the stator core 10.

[0049] In one embodiment, in order to prevent the coolant from flowing into the gap between the stator core 10 and the rotor 50 through the gap between the cooling jacket 20 and the stator core 10, a sealing gasket is arranged between the cooling jacket 20 and the stator core 10. Exemplarily, the sealing gasket is adapted to the radial cross-sectional shape of the cooling jacket 20 and may be in a circular ring shape. In addition, the cooling jacket 20 and the stator core 10 may also be sealed by adhesive sealing.

[0050] As another case, the cooling jacket 20 includes: an inner sidewall 23 and a top wall 24. One end of the inner sidewall 23 is connected to one end of the top wall 24, the other end of the inner sidewall 23 abuts against the end of the stator core 10, and the other end of the top wall 24 abuts against the inner wall of the motor housing.

[0051] In one embodiment, a sealing gasket is arranged between the cooling jacket 20, the stator core 10, and the inner wall of the motor housing. Exemplarily, the sealing gasket is adapted to the radial cross-sectional shape of the cooling jacket 20 and may be in a circular ring shape. In addition, the cooling jacket 20, the stator core 10, and the inner wall of the motor housing may also be sealed by an adhesive sealing layer.

[0052] In one embodiment, in combination with FIGS. 8 and 2, the stator core 10 has a central bore 13 arranged axially. In the radial direction of the stator core 10, the stator slots 11 are arranged outside the central bore 13, and the inner sidewall 23 of the cooling jacket 20 is arranged between the stator slots 11 and the central bore 13. As described above, the central bore 13 of the stator core 10 passes through the axis of the stator core 10 and is used for installing the rotor 50 of the motor. The inner sidewall 23 of the cooling jacket 20 is arranged between the stator slots 11 and the central bore 13, so that the cooling jacket 20 will not interfere with the operation of the rotor 50.

[0053] In one embodiment, as shown in FIG. 2, the outer sidewall 22 of the cooling jacket 20 at one end of the stator core 10 is provided with a liquid inlet 25, and the top wall 24 of the cooling jacket 20 arranged at the other end of the stator core 10 is provided with a liquid outlet 26, wherein the liquid outlet 26 is arranged close to the upper end of the motor.

[0054] In this embodiment, the liquid outlet 26 is arranged at the upper end of the motor, which can ensure that the entire coolant flow path is filled with coolant, enabling the windings 30 at both ends of the stator core 10 to fully contact the flowing coolant to take away more heat. In the related art, there is a solution in which the liquid outlet 26 is arranged close to the lower end of the motor. In this solution, the coolant will flow to the place with small flow resistance, which will lead to many parts of the winding 30 at the end of the stator core 10 not being in contact with the coolant and thus unable to be cooled (the circumferential channel at the end is relatively large). In addition, setting the liquid outlet 26 at the upper end of the motor can also ensure the flow of the coolant in the circumferential cooling channel 12 inside the stator core 10 to take away the temperature of the winding 30 inside the core. If the liquid outlet 26 is at the lower end, the coolant may only flow through the lower cooling channel 12, resulting in the winding 30 inside the upper core not being cooled, the hot spot temperature of the motor not decreasing, and the performance of the motor not being fully utilized.

[0055] In one embodiment, as shown in FIG. 2, the liquid inlet 25 is arranged close to the upper end or the lower end of the motor. The liquid inlet 25 is arranged in the radial direction of the cooling jacket 20, and the liquid outlet 26 is arranged in the axial direction of the cooling jacket 20. Exemplarily, FIG. 6 shows the first cooling jacket 201 arranged at one end of the stator core 10, and FIG. 7 shows the second cooling jacket 202 arranged at the other end of the stator core 10. The liquid inlet 25 is arranged on the outer sidewall 22 of the first cooling jacket 201 , and the liquid outlet 26 is arranged on the top wall 24 of the second cooling jacket 202. When the first cooling jacket 201 is installed at the end of the stator core 10, the liquid inlet 25 can be close to the upper end or the lower end of the motor. When the second cooling jacket 202 is installed at the other end of the stator core 10, the liquid outlet 26 is arranged close to the upper end of the motor.

[0056] In one embodiment, as shown in FIGS. 8 and 9, the stator core 10 is in a cylindrical shape. The stator core 10 has a plurality of stator slots 11 and a plurality of cooling channels 12, and both the plurality of stator slots 11 and the plurality of cooling channels 12 are arranged along the circumferential direction of the stator core 10. As one case, as shown in FIG. 8, the cooling channels 12 are arranged radially outside the stator slots 11 , and the cooling channels 12 are arranged outside two adjacent stator slots 11; as another case, along the circumferential direction of the stator core 10, the cooling channels 12 are arranged adjacent to the stator slots 11 , and the cooling channels 12 are arranged between two adjacent stator slots 11. In this embodiment, the cross-section of the cooling channel 12 can be a rectangular hole, a circular hole, or an oblong arc-shaped hole, etc. As described above, the cooling channels 12 and the stator slots 11 are arranged alternately and staggered in the circumferential direction of the stator core 10, which is beneficial for the cooling channels 12 to better cool the windings 30 arranged in the stator slots 11 , reduce the temperature of the windings 30 located inside the stator core 10, and improve the heat dissipation effect of the cooling structure.

[0057] In one embodiment, as shown in FIGS. 3 and 8, the radial cross-sectional area of the cooling channel 12 is smaller than that of the stator slot 11. Nowadays, the electric drive system of automobiles has a trend of small volume. In order to ensure the cooling effect and not increase the volume of the motor as much as possible, the present invention sets the radial cross-section of the cooling channel 12 to be relatively small, which is beneficial for arranging more cooling channels 12 in the stator core 10 and ensuring the cooling effect.

[0058] As shown in FIGS. 1-3, based on the motor cooling structure provided in the above embodiment, the embodiment of the present invention also discloses a motor 100, including: a shaft 40, a rotor 50, a motor cooling structure, and a housing 60. The rotor 50 has a cavity of the rotor 50, and the rotor 50 is sleeved outside the shaft 40 through the cavity of the rotor 50. The shaft 40 has two ends along the axial direction, and the ends of the shaft 40 are arranged outside the cavity of the rotor 50. The motor cooling structure includes: a stator core 10 and a cooling jacket 20. The stator core 10 has a central bore 13, and the stator core 10 is sleeved outside the rotor 50 through the central bore 13. The shaft 40, the rotor 50, and the stator core 10 are arranged coaxially with respect to the shaft 40. The stator core 10 has stator slots 11 and a cooling channel 12 arranged axially, and the inner wall of the stator slot 11 has a circumferentially closed structure. In the radial direction of the stator core 10, the cooling channel 12 is arranged outside the stator slot 11. The cooling jacket 20 forms a circumferentially open annular cavity 21 , and the cooling jacket 20 is arranged at the two ends of the stator core 10. A winding 30 is arranged in the stator slot 11 of the stator core 10, and both ends of the winding 30 extend out of the stator slot 11 and are arranged in the annular cavity 21 of the cooling jacket 20. The cooling jackets 20 located at both ends of the stator core 10 are respectively provided with a liquid inlet 25 and a liquid outlet 26 that are in communication with the annular cavity 21. The annular cavity 21 and the cooling channel 12 form the coolant flow path of the motor, and the coolant flow path is fluidly isolated from the central bore 13. The housing 60 is arranged outside the motor cooling structure, both ends of the shaft 40 extend outside the housing 60, and the housing 60 keeps the shaft 40, the rotor 50, and the motor cooling structure in a compressed state. Two notches 61 are arranged on the housing 60, which are respectively in communication with the liquid inlet 25 and the liquid outlet 26 of the cooling jacket 20.

[0059] In one embodiment, the sidewall of the cooling jacket 20 arranged at one end of the stator core 10 has a liquid inlet 25, and the sidewall of the cooling jacket 20 arranged at the other end of the stator core 10 has a liquid outlet 26, wherein the liquid outlet 26 is arranged close to the upper end of the motor. The housing 60 has a notch 61 close to the upper end of the motor, and this notch 61 is in communication with the liquid outlet 26 of the cooling jacket 20.

[0060] Exemplarily, a first cooling jacket 201 and a second cooling jacket 202 are respectively arranged at the two ends of the stator core 10. Both the first cooling jacket 201 and the second cooling jacket 202 include: an outer sidewall 22, an inner sidewall 23, and a top wall 24. The liquid inlet 25 is arranged on the outer sidewall 22 of the first cooling jacket 201 , and the liquid outlet 26 is arranged on the top wall 24 of the second cooling jacket 202. Both the liquid inlet 25 and the liquid outlet 26 are arranged close to the upper end of the motor. A first notch 611 is arranged on the top wall of the housing 60 close to the upper end of the motor, and the first notch 611 is in communication with the liquid inlet 25 of the first cooling jacket 201 . A second notch 612 is arranged on the sidewall of the housing 60 close to the upper end of the motor, and the second notch 612 is in communication with the liquid outlet 26 of the second cooling jacket 202. The inner wall of the first notch 611 is aligned with the inner wall of the liquid inlet 25, and the inner wall of the second notch 612 is aligned with the inner wall of the liquid outlet 26. The coolant enters the annular cavity 21 of the first cooling jacket

[0061] 201 through the first notch 611 and the liquid inlet 25, and flows circumferentially along the first cooling jacket 201 to cool one end of the winding 30. At the same time, the coolant enters the cooling channel 12 inside the stator core 10 through the annular cavity 21 to cool the part of the winding 30 located inside the stator core 10. The coolant reaches the annular cavity 21 of the second cooling jacket 202 through the cooling channel 12 and flows circumferentially along the second cooling jacket

[0062] 202 to cool the other end of the winding 30. Thus, the motor provided in the embodiment of the present invention can make the winding 30 be fully and uniformly cooled, and when the motor operates at a high speed, the coolant will not enter the air gap between the stator and the rotor 50 through the stator slots 11 , increasing the oil churning loss and affecting the operating efficiency of the motor.

[0063] Based on the above motor 100, the embodiment of the present invention also provides a vehicle. The vehicle includes the motor provided in the embodiment of the present invention. Exemplarily, the vehicle can be a new energy vehicle.

[0064] The technical solutions provided in this application have been described in detail above. Specific examples have been used herein to explain the principles and implementation manners of this application. The descriptions of the above embodiments are only used to help understand the method of this application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In conclusion, the content of this specification should not be construed as a limitation to this application.

[0065] All the above optional technical solutions can be combined in any way to form optional embodiments of the present invention, and details will not be repeated here one by one.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

Claims1 . A motor cooling structure comprising: a stator core, having an axially arranged central bore, a stator slot, and a cooling channel, wherein the central bore is configured to accommodate a rotor, the stator slot is configured to accommodate a winding, and the cooling channel is disposed in a stator yoke of the stator core; a cooling jacket, disposed at two axial ends of the stator core and defining an open annular cavity, wherein two ends of the winding extend outside the stator slot and are disposed in the annular cavity, and the annular cavity is in fluid communication with the cooling channel to form a coolant flow path fluidly isolated from the central bore.

2. The motor cooling structure according to claim 1 , wherein both the stator slot and the cooling channel have open ends and circumferentially closed inner walls.

3. The motor cooling structure according to claim 1 , wherein the cooling jacket comprises an inner sidewall and a top wall, wherein the inner sidewall and the top wall enclose a circumferentially open annular cavity, an end of the inner sidewall adjacent to an open side abuts an axial end of the stator core, and an end of the top wall adjacent to the open side abuts an inner wall of a motor housing.

4. The motor cooling structure according to claim 1 , wherein the cooling jacket comprises an inner sidewall, an outer sidewall, and a top wall, wherein the inner sidewall, the outer sidewall, and the top wall enclose a circumferentially open annular cavity, the open side of the annular cavity faces an axial end of the stator core, and ends of the inner sidewall and the outer sidewall adjacent to the open side about the axial end of the stator core.

5. The motor cooling structure according to claim 3 or 4, wherein in a radial direction of the stator core, the stator slots are disposed radially outward of the central bore, and the inner sidewall of the cooling jacket is disposed between the stator slots and the central bore.

6. The motor cooling structure according to claim 4, wherein the outer sidewall of the cooling jacket at one axial end of the stator core has a liquid inlet, and the top wall of the cooling jacket at the other axial end has a liquid outlet; wherein in an installed state of the motor, the liquid outlet is positioned adjacent to an upper end of the motor.

7. The motor cooling structure according to claim 1 , wherein the motor is a flat wire motor, and the windings are flat copper wires.

8. The motor cooling structure according to claim 1 , wherein a sealing gasket or adhesive sealing layer is disposed between the cooling jacket and at least one of the stator core and / or an inner wall of the motor housing.

9. A motor comprising: a shaft; a rotor sleeved on the shaft;the motor cooling structure according to any one of claims 1-8, wherein the stator core is sleeved on the rotor and coaxially arranged with the shaft; a housing defining the shaft, the rotor, and the motor cooling structure, wherein two ends of the shaft extend outside the housing, and the housing maintains the shaft, the rotor, and the motor cooling structure in a clamped state.

10. A vehicle, comprising the motor according to claim 9.

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