Motor stator cooling structure and motor

Abstract

The present application provides a motor stator cooling structure and a motor. The motor stator cooling structure includes a stator core (1), stator slots, a winding (13), and a cooling channel assembly. The stator slots include an inner stator slot (2) and an outer stator slot (3). The winding (13) is wound in the inner stator slot (2) and the outer stator slot (3). The cooling channel assembly includes an axial channel (4) extending along the axial direction of the stator core (1), and the axial channel (4) is arranged in the inner stator slot (2) and the outer stator slot (3). According to the motor stator cooling structure of the present application, effective cooling of the motor stator can be achieved, local overheating of the winding can be avoided, and the output power of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to a motor stator cooling structure and a motor. Background Art

[0002] With the country's strong promotion of industrial upgrading, the motor field will continue to develop towards high speed and miniaturization. As a result, the motor power density, loss density, etc. are all increasing continuously, and the heat generation of the motor winding, especially the end winding, will further increase.

[0003] Adopting the back-wound winding form can effectively reduce the size of the motor winding end, especially the outgoing line end. With the end resistance becoming smaller, the heat generation can be reduced. However, under the condition of the same number of turns, the back-wound winding requires a larger space for the insulating filling medium. To ensure that the motor magnetic field distribution is not overly saturated and the output torque under the same current remains unchanged, the size of the motor stator core will become larger. It is very difficult for the heat of the winding, especially the inner winding far from the housing with the cooling channel and the inner stator teeth, to conduct out, which will still cause the local temperature of the stator, especially the winding, to be too high, restricting the output power of the motor and possibly damaging the motor seriously in severe cases, resulting in safety accidents. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a motor stator cooling structure and a motor, which can effectively cool the motor stator, avoid the local temperature of the winding being too high, and improve the output power of the motor.

[0005] To solve the above problems, the present application provides a motor stator cooling structure, including a stator core, stator slots, windings, and a cooling channel assembly. The stator slots include inner stator slots and outer stator slots. The windings are wound in the inner stator slots and the outer stator slots. The cooling channel assembly includes an axial channel extending along the axial direction of the stator core, and the axial channel is arranged in the inner stator slots and the outer stator slots.

[0006] Preferably, the stator slots are filled with an insulating medium, the insulating medium is a heat-conducting material, and the axial channel is buried in the insulating medium.

[0007] Preferably, the axial channel is fixed by the insulating medium.

[0008] Preferably, the insulating medium is composed of a resin and a curing agent, and the thermal conductivity of the insulating medium is greater than or equal to 0.5 W / (m*k).

[0009] Preferably, the cooling channel assembly further includes a connecting channel, and the axial channels are connected through the connecting channel.

[0010] Preferably, the connecting flow channels include a first connecting flow channel and a second connecting flow channel. The adjacent axial flow channels located in the inner stator slot are sequentially connected through the first connecting flow channel to form a series-connected inner cooling flow channel, and the adjacent axial flow channels located in the outer stator slot are sequentially connected through the second connecting flow channel to form a series-connected outer cooling flow channel.

[0011] Preferably, the connecting flow channels include a third connecting flow channel and a fourth connecting flow channel. The axial flow channels in the inner stator slot and the outer stator slot where the same winding is located at the first end are connected through the third connecting flow channel, and the axial flow channels in the inner stator slot and the outer stator slot where the adjacent winding is located at the second end are connected through the fourth connecting flow channel to form a cooling flow channel assembly connected in series inside and outside in sequence.

[0012] Preferably, the connecting flow channels include a first connecting flow channel, a third connecting flow channel and a fourth connecting flow channel. The adjacent axial flow channels in some of the inner stator slots are connected through the first connecting flow channel, the axial flow channels in the inner stator slot and the outer stator slot where the same winding is located at the first end are connected through the third connecting flow channel, and the axial flow channels in the inner stator slot and the outer stator slot where the adjacent winding is located at the second end are connected through the fourth connecting flow channel to form a cooling flow channel assembly connected in series inside and outside in sequence.

[0013] Preferably, the connecting flow channels include a second connecting flow channel, a third connecting flow channel and a fourth connecting flow channel. The adjacent axial flow channels in some of the outer stator slots are connected through the second connecting flow channel, the axial flow channels in the inner stator slot and the outer stator slot where the same winding is located at the first end are connected through the third connecting flow channel, and the axial flow channels in the inner stator slot and the outer stator slot where the adjacent winding is located at the second end are connected through the fourth connecting flow channel to form a cooling flow channel assembly connected in series inside and outside in sequence.

[0014] Preferably, the connecting flow channels include a first connecting flow channel, a second connecting flow channel, a third connecting flow channel and a fourth connecting flow channel. The adjacent axial flow channels in some of the inner stator slots are connected through the first connecting flow channel, the adjacent axial flow channels in some of the outer stator slots are connected through the second connecting flow channel, the axial flow channels in the inner stator slot and the outer stator slot where the same winding is located at the first end are connected through the third connecting flow channel, and the axial flow channels in the inner stator slot and the outer stator slot where the adjacent winding is located at the second end are connected through the fourth connecting flow channel to form a cooling flow channel assembly connected in series inside and outside in sequence.

[0015] Preferably, after the axial flow channels are positioned in the stator slots, an insulating medium is filled to fix them, and the windings and axial flow channels located in the stator slots are completely wrapped by the insulating medium.

[0016] Preferably, the cooling channel assembly further includes a cooling inlet pipe and a cooling outlet pipe. The cooling medium enters through the cooling inlet pipe, flows through all the axial channels, and then flows out through the cooling outlet pipe.

[0017] Preferably, the cooling inlet pipe and the cooling outlet pipe are directly connected to an external cooling medium supply device to form an independent cooling flow path.

[0018] Preferably, the cooling inlet pipe and the cooling outlet pipe are connected to the internal cooling channels of the motor to form a whole-machine circulating cooling circuit.

[0019] According to another aspect of the present application, there is provided a motor including a motor stator cooling structure, and the motor stator cooling structure is the above-mentioned motor stator cooling structure.

[0020] The motor stator cooling structure provided by the present application includes a stator core, stator slots, windings, and a cooling channel assembly. The stator slots include inner stator slots and outer stator slots. The windings are wound in the inner stator slots and the outer stator slots. The cooling channel assembly includes axial channels extending along the axis of the stator core, and the axial channels are arranged in the inner stator slots and the outer stator slots. In the motor stator cooling structure of this embodiment, axial channels are arranged in both the inner stator slots and the outer stator slots where the windings with relatively large heat generation are located, forming a way of placing cooling channels in the slots. The cooling medium in the axial channels can effectively cool the windings and the stator core, effectively reducing the temperature of the stator, especially the windings, improving the power density and stability of the motor, avoiding excessive local temperature of the windings, and increasing the output power of the motor. Description of the Drawings

[0021] Figure 1 It is a flow channel structure diagram of the motor stator cooling structure according to an embodiment of the present application;

[0022] Figure 2 It is a partial stator structure diagram of the motor stator cooling structure according to an embodiment of the present application;

[0023] Figure 3 It is a three-dimensional structure diagram of the axial channel of the motor stator cooling structure according to an embodiment of the present application;

[0024] Figure 4 It is a three-dimensional structure diagram of the first connecting channel of the motor stator cooling structure according to an embodiment of the present application;

[0025] Figure 5 It is a three-dimensional structure diagram of the third connecting channel of the motor stator cooling structure according to an embodiment of the present application;

[0026] Figure 6 It is a three-dimensional structure diagram of the fourth connecting channel of the motor stator cooling structure according to an embodiment of the present application;

[0027] Figure 7 Schematic three - dimensional structure diagram of the motor stator cooling structure according to an embodiment of the present application;

[0028] Figure 8 Schematic diagram of the first end face structure of the motor stator cooling structure according to an embodiment of the present application;

[0029] Figure 9 Schematic diagram of the second end face structure of the motor stator cooling structure according to an embodiment of the present application;

[0030] Figure 10 Schematic diagram of the structure after potting of the motor stator cooling structure according to an embodiment of the present application.

[0031] The reference numerals are shown as:

[0032] 1, stator core; 2, inner stator slot; 3, outer stator slot; 4, axial flow channel; 5, insulating medium; 6, first connecting flow channel; 7, third connecting flow channel; 8, fourth connecting flow channel; 9, cooling inlet pipe; 10, cooling outlet pipe; 11, stator yoke; 12, stator tooth; 13, winding. Detailed implementation manners

[0033] Referring to Figures 1 to 10 As shown, according to the embodiment of the present application, the motor stator cooling structure includes a stator core 1, stator slots, a winding 13, and a cooling flow channel assembly. The stator slots include an inner stator slot 2 and an outer stator slot 3. The winding 13 is wound in the inner stator slot 2 and the outer stator slot 3. The cooling flow channel assembly includes an axial flow channel 4 extending along the axis of the stator core 1, and the axial flow channel 4 is arranged in the inner stator slot 2 and the outer stator slot 3.

[0034] In the motor stator cooling structure of this embodiment, axial flow channels 4 are arranged in both the inner stator slot 2 and the outer stator slot 3 where the winding 13 with a large heat generation amount is located, forming a way of placing cooling flow channels in the slots. It can use the flow of the cooling medium in the axial flow channels 4 to take away the heat of the winding 13 and the stator, effectively cool the winding 13 and the stator core 1, can effectively reduce the temperature of the stator, especially the winding 13, improve the power density and stability of the motor, avoid local over - high temperature of the winding, and improve the output power of the motor.

[0035] In this embodiment, the stator core 1 is formed by laminating or integrally processing a magnetic conductive material. The magnetic conductive material is, for example, a soft magnetic material such as silicon steel sheet or amorphous alloy. The stator core 1 includes an inner stator slot 2, an outer stator slot 3, a stator yoke portion 11, and a stator tooth portion 12. The inner stator slot 2 is located between adjacent inner stator tooth portions 12, and the outer stator slot 3 is located between adjacent outer stator tooth portions 12. Insulation treatment needs to be performed between the winding 13 and the stator core 1, and the insulation class needs to be F class or above.

[0036] The axial flow channel 4 is located in the inner stator slot 2 and the outer stator slot 3, and is relatively close to both the winding 13 and the stator tooth portion 12, enabling sufficient heat exchange. When the cooling medium flows, it can not only take away the heat of the winding 13 located in the stator slot, but also take away the heat generated by the stator tooth portions 12 on both sides, effectively improving the cooling effect of the motor stator.

[0037] After the cooling medium is introduced into the cooling channel assembly, the heat generated by the stator core 1 and the winding 13 can be taken away during the flow of the cooling medium. Since the axial flow channels 4 of the cooling channel assembly are uniformly arranged in all stator slots and are close to both the stator core 1 and the winding 13 at the same time, the cooling effect will be more prominent compared with the cooling systems in the related art.

[0038] The above-mentioned cooling channel assembly is made of metal materials with relatively high thermal conductivity such as copper and aluminum, which can obtain better cooling effects. The cooling channel assembly should have certain pressure resistance and good airtightness, and the safety electrical distance should be satisfied between the cooling channel assembly and the winding 13.

[0039] In one embodiment, the stator slot is filled with an insulating medium 5. The insulating medium 5 is a heat-conducting material, and the axial flow channel 4 is buried in the insulating medium 5, which can increase the heat transfer area between the axial flow channel 4, the stator core 1, and the winding 13. The heat-conducting insulating medium 5 is used to improve the heat transfer efficiency, enhance the heat exchange effect between the cooling medium in the axial flow channel 4, the stator core 1, and the winding 13, and improve the cooling effect of the motor stator cooling structure on the motor stator.

[0040] In one embodiment, the cooling channel assembly can be fixed by the structure of the motor itself. For example, it can be fixed by a skeleton, or by adding an insulating fixing structure on the stator core 1.

[0041] In one embodiment, the axial flow channel 4 is fixed by the insulating medium 5. In this way, the insulating medium 5 can be used to install and fix the axial flow channel 4, and then the cooling channel assembly can be fixed, without adding additional fixing structures. Therefore, the overall structure is simpler and more convenient to implement.

[0042] In one embodiment, the insulating medium 5 is formed by mixing a resin and a curing agent, and the thermal conductivity of the insulating medium 5 is greater than or equal to 0.5 W / (m*k). The mixture formed by mixing the resin and the curing agent has good fluidity at room temperature and good thermal conductivity after curing. Therefore, it can more effectively ensure that the combination between the insulating medium 5 and each component is denser, the bonding strength is higher, the bonding effect is better, the heat transfer effect is better, and the fixing effect is good.

[0043] In one embodiment, the cooling channel assembly further includes a connecting channel, and the axial channels 4 are connected through the connecting channel. In this embodiment, the axial channels 4 can be connected through the connecting channel to form an integral cooling channel assembly, which can be more conveniently connected to the cooling medium supply structure, reducing the connection difficulty, having better integrity and better cooling effect.

[0044] In one embodiment, the connecting channel includes a first connecting channel 6 and a second connecting channel. The adjacent axial channels 4 located in the inner stator slot 2 are sequentially connected through the first connecting channel 6 to form a series-connected inner cooling channel, and the adjacent axial channels 4 located in the outer stator slot 3 are sequentially connected through the second connecting channel to form a series-connected outer cooling channel.

[0045] In this embodiment, the axial channels 4 located in the inner stator slot 2 and the axial channels 4 located in the outer stator slot 3 form two independent cooling flow paths. After the axial channels 4 located in the inner stator slot 2 are connected in series through the first connecting channel 6, they effectively cool the inner circle of the winding and the inner circle of the stator core. After the axial channels 4 located in the outer stator slot 3 are connected in series through the second connecting channel, they effectively cool the outer circle of the winding and the outer circle of the stator core. The structure of the second connecting channel and the first connecting channel 6 in this embodiment is similar, but the lengths are different.

[0046] The inner cooling channel and the outer cooling channel of this embodiment can be arranged in parallel or in series. When arranged in parallel, they can be directly connected through the cooling inlet pipe and the cooling outlet pipe. When arranged in series, they also need to be connected through the following third connecting channel 7 and / or fourth connecting channel 8.

[0047] In one embodiment, the connecting flow channels include a third connecting flow channel 7 and a fourth connecting flow channel 8. The axial flow channels 4 in the inner stator slot 2 and the outer stator slot 3 where the same winding 13 is located at the first end are connected through the third connecting flow channel 7, and the axial flow channels 4 in the inner stator slot 2 and the outer stator slot 3 where the adjacent winding 13 is located at the second end are connected through the fourth connecting flow channel 8, forming a cooling flow channel assembly connected in series inside and outside in sequence. In this embodiment, the axial flow channels 4 located in the same radial direction at one end are connected through the third connecting flow channel 7, and the inner axial flow channel 4 and the adjacent outer axial flow channel 4 located in different radial directions are connected through the fourth connecting flow channel 8. In this way, all the axial flow channels 4 can be connected in series through the connecting flow channels in sequence to form a series-connected cooling flow channel assembly, realizing effective cooling of the winding 13 and the stator core 1. In this embodiment, since both the third connecting flow channel 7 and the fourth connecting flow channel 8 are arranged at the end of the winding 13, end face cooling of the winding 13 can be achieved. Cooperating with the axial flow channel 4, more comprehensive and effective cooling of the winding 13 can be achieved, further improving the cooling effect on the winding 13.

[0048] In one embodiment, the connecting flow channels include a first connecting flow channel 6, a third connecting flow channel 7, and a fourth connecting flow channel 8. The adjacent axial flow channels 4 in some of the inner stator slots 2 are connected through the first connecting flow channel 6, the axial flow channels 4 in the inner stator slot 2 and the outer stator slot 3 where the same winding 13 is located at the first end are connected through the third connecting flow channel 7, and the axial flow channels 4 in the inner stator slot 2 and the outer stator slot 3 where the adjacent winding 13 is located at the second end are connected through the fourth connecting flow channel 8, forming a cooling flow channel assembly connected in series inside and outside in sequence. In this embodiment, different connecting flow channels can be combined and used as needed, so that all the axial flow channels 4 can be connected in series. The difference is that the formed cooling flow channel assemblies will have different flow paths when different combinations of connecting flow channels are adopted.

[0049] In one embodiment, the connecting flow channels include a second connecting flow channel, a third connecting flow channel 7, and a fourth connecting flow channel 8. The adjacent axial flow channels 4 in some of the outer stator slots 3 are connected through the second connecting flow channel, the axial flow channels 4 in the inner stator slot 2 and the outer stator slot 3 where the same winding 13 is located at the first end are connected through the third connecting flow channel 7, and the axial flow channels 4 in the inner stator slot 2 and the outer stator slot 3 where the adjacent winding 13 is located at the second end are connected through the fourth connecting flow channel 8, forming a cooling flow channel assembly connected in series inside and outside in sequence.

[0050] In one embodiment, the connecting flow channels include a first connecting flow channel 6, a second connecting flow channel, a third connecting flow channel 7, and a fourth connecting flow channel 8. The adjacent axial flow channels 4 within a part of the inner stator slot grooves 2 are communicated through the first connecting flow channel 6, the adjacent axial flow channels 4 within a part of the outer stator slot grooves 3 are communicated through the second connecting flow channel, the axial flow channels 4 within the inner stator slot grooves 2 and the outer stator slot grooves 3 where the same winding 13 is located at the first end are communicated through the third connecting flow channel 7, and the axial flow channels 4 within the inner stator slot grooves 2 and the outer stator slot grooves 3 where the adjacent winding 13 is located at the second end are communicated through the fourth connecting flow channel 8, thus forming a cooling flow channel assembly that is connected in series inside and outside in sequence.

[0051] In one embodiment, after the axial flow channels 4 are positioned within the stator slot grooves, they are filled with an insulating medium 5 for fixation, and the windings 13 and the axial flow channels 4 within the stator slot grooves are completely wrapped by the insulating medium 5.

[0052] In one embodiment, the cooling flow channel assembly further includes a cooling inlet pipe 9 and a cooling outlet pipe 10. The cooling medium enters through the cooling inlet pipe 9, and after flowing through all the axial flow channels 4, it flows out from the cooling outlet pipe 10.

[0053] In one embodiment, the cooling inlet pipe 9 and the cooling outlet pipe 10 are directly connected to an external cooling medium supply device to form an independent cooling flow path. This cooling flow path is independent of other flow paths inside the motor, so the temperature of the cooling medium is lower and it has a better cooling effect.

[0054] In one embodiment, the cooling inlet pipe 9 and the cooling outlet pipe 10 are connected to internal cooling flow channels of the motor, such as a housing flow channel or an end cover flow channel, etc., to form a whole-machine circulating cooling loop. This cooling loop is realized by using the internal cooling flow path of the motor, so the structure is simpler, there is no need to increase the source of external cooling medium, the overall structure is more concise, it is more conducive to miniaturization, and the structure is more compact.

[0055] The manufacturing method of the motor stator cooling structure in this embodiment is as follows:

[0056] After the wire embedding process of the back-wound winding 13 is completed in the stator core 1, the axial flow channel 4 is placed in the inner stator slot 2 and the outer stator slot 3, and preliminary positioning is carried out using corresponding tooling; the stator core 1 is placed in the corresponding device for the filling process of the insulating medium 5. During the filling process, it is necessary to ensure that the entire environment is in a negative pressure state. During the filling process, the process of filling - observing - re-vacuuming - filling again needs to be carried out multiple times. This can ensure that no bubbles are generated in the insulating medium 5 and can also precisely control the volume of the insulating medium 5. After filling, the motor stator is placed in an incubator for insulation for a period of time to cure the insulating medium 5. After curing, the axial flow channel 4 will be fixed in the inner stator slot 2 and the outer stator slot 3 without loosening, and the insulating medium 5 will completely wrap the winding 13 and the axial flow channel 4 in the stator slot.

[0057] After the curing of the insulating medium 5 is completed, all connecting channels are assembled on the axial flow channel 4, and the axial flow channel 4 and each connecting channel are formed into one body by welding. After the assembly is completed, the cooling channel assembly should have certain pressure resistance and good airtightness. In this way, the production of the cooling structure of the new motor stator is completed.

[0058] According to an embodiment of the present application, the motor includes a motor stator cooling structure, and the motor stator cooling structure is the above-mentioned motor stator cooling structure.

[0059] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0060] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A motor stator cooling structure, characterized in that, it includes a stator core (1), stator slots, a winding (13) and a cooling channel assembly. The stator slots include an inner stator slot (2) and an outer stator slot (3). The winding (13) is wound in the inner stator slot (2) and the outer stator slot (3). The cooling channel assembly includes an axial channel (4) extending along the axial direction of the stator core (1). The axial channel (4) is arranged in the inner stator slot (2) and the outer stator slot (3). The cooling channel assembly further includes connecting channels. The axial channels (4) are communicated through the connecting channels. The connecting channels include a first connecting channel (6) and a second connecting channel. The adjacent axial channels (4) located in the inner stator slot (2) are sequentially communicated through the first connecting channel (6) to form a series-connected inner cooling channel. The adjacent axial channels (4) located in the outer stator slot (3) are sequentially communicated through the second connecting channel to form a series-connected outer cooling channel.

2. The motor stator cooling structure according to claim 1, characterized in that, an insulating medium (5) is filled in the stator slots. The insulating medium (5) is a heat-conducting material. The axial channel (4) is buried in the insulating medium (5).

3. The motor stator cooling structure according to claim 2, characterized in that, the axial channel (4) is fixed by the insulating medium (5).

4. The motor stator cooling structure according to claim 2, characterized in that, the insulating medium (5) is composed of a resin and a curing agent. The thermal conductivity of the insulating medium (5) is greater than or equal to 0.5 W / (m*k).

5. The motor stator cooling structure according to claim 1, characterized in that, the connecting channels include a third connecting channel (7) and a fourth connecting channel (8). The axial channels (4) in the inner stator slot (2) and the outer stator slot (3) where the same winding (13) is located at the first end are communicated through the third connecting channel (7). The axial channels (4) in the inner stator slot (2) at the second end and the outer stator slot (3) where the adjacent winding (13) is located are communicated through the fourth connecting channel (8) to form an internally and externally series-connected cooling channel assembly.

6. The motor stator cooling structure according to claim 1, characterized in that, The connecting flow channels include a first connecting flow channel (6), a third connecting flow channel (7), and a fourth connecting flow channel (8). The adjacent axial flow channels (4) within part of the inner stator slot grooves (2) are communicated through the first connecting flow channel (6). The axial flow channels (4) within the inner stator slot grooves (2) and the outer stator slot grooves (3) where the same winding (13) is located at the first end are communicated through the third connecting flow channel (7). The axial flow channels (4) within the inner stator slot grooves (2) and the outer stator slot grooves (3) where the adjacent winding (13) is located at the second end are communicated through the fourth connecting flow channel (8), thereby forming a cooling flow channel assembly that is connected in series inside and outside in sequence.

7. The motor stator cooling structure according to claim 1, characterized in that the connecting flow channels include a second connecting flow channel, a third connecting flow channel (7), and a fourth connecting flow channel (8). The adjacent axial flow channels (4) within part of the outer stator slot grooves (3) are communicated through the second connecting flow channel. The axial flow channels (4) within the inner stator slot grooves (2) and the outer stator slot grooves (3) where the same winding (13) is located at the first end are communicated through the third connecting flow channel (7). The axial flow channels (4) within the inner stator slot grooves (2) and the outer stator slot grooves (3) where the adjacent winding (13) is located at the second end are communicated through the fourth connecting flow channel (8), thereby forming a cooling flow channel assembly that is connected in series inside and outside in sequence.

8. The motor stator cooling structure according to claim 1, characterized in that the connecting flow channels include a first connecting flow channel (6), a second connecting flow channel, a third connecting flow channel (7), and a fourth connecting flow channel (8). The adjacent axial flow channels (4) within part of the inner stator slot grooves (2) are communicated through the first connecting flow channel (6). The adjacent axial flow channels (4) within part of the outer stator slot grooves (3) are communicated through the second connecting flow channel. The axial flow channels (4) within the inner stator slot grooves (2) and the outer stator slot grooves (3) where the same winding (13) is located at the first end are communicated through the third connecting flow channel (7). The axial flow channels (4) within the inner stator slot grooves (2) and the outer stator slot grooves (3) where the adjacent winding (13) is located at the second end are communicated through the fourth connecting flow channel (8), thereby forming a cooling flow channel assembly that is connected in series inside and outside in sequence.

9. The motor stator cooling structure according to any one of claims 1 to 4, characterized in that after the axial flow channels (4) are positioned within the stator slot grooves, an insulating medium (5) is filled and fixed, and the winding (13) and the axial flow channels (4) within the stator slot grooves are completely wrapped by the insulating medium (5).

10. The motor stator cooling structure according to any one of claims 1 to 4, characterized in that the cooling flow channel assembly further includes a cooling inlet pipe (9) and a cooling outlet pipe (10). The cooling medium enters through the cooling inlet pipe (9), flows through all the axial flow channels (4), and then flows out through the cooling outlet pipe (10).

11. The motor stator cooling structure according to claim 10, characterized in that, the cooling inlet pipe (9) and the cooling outlet pipe (10) are directly connected to an external cooling medium supply device to form an independent cooling flow path.

12. The motor stator cooling structure according to claim 10, characterized in that, the cooling inlet pipe (9) and the cooling outlet pipe (10) are connected to an internal cooling flow path of the motor to form a whole-machine circulating cooling loop.

13. A motor, comprising a motor stator cooling structure, characterized in that, the motor stator cooling structure is the motor stator cooling structure according to any one of claims 1 to 12.

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