Axial flux motor stator cooling structure and axial flux motor

Abstract

The invention belongs to the related technical field of motor cooling technology, and discloses an axial flux motor stator cooling structure and an axial flux motor, the stator cooling structure comprises a casing, a stator, an inner support, a front sealing plate and a rear sealing plate; the inner support is arranged in the machine shell, and the two sealing plates are arranged at the two ends of the machine shell to define a sealed space. The multiple stators are distributed in the sealed space in the circumferential direction, limiting grooves are formed in the positions, corresponding to the stators, of any sealing plate, the pole shoes of the stator iron cores are placed in the limiting grooves in a matched mode, iron core flow channels are formed between the pole shoes at at least one end and the corresponding limiting grooves, and the iron core flow channels conduct direct heat exchange cooling on the iron cores through circulating cooling liquid. Fixing and limiting of the iron core are achieved through the arrangement of the limiting grooves, the iron core flow channels are formed between the pole shoes and the limiting grooves, cooling liquid can make direct contact with the stator iron core, and the heat dissipation effect on the iron core is improved; the structure is simple and compact, and the overall performance of the motor is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motor cooling technology, and more particularly to an axial flux motor stator cooling structure and an axial flux motor. BACKGROUND

[0002] The axial flux permanent magnet motor has good application prospects in weight and space limited occasions such as aerospace, ship propulsion, electric vehicles, and robot joints due to its advantages of flat and compact structure, high power density, etc. During the operation of the motor, the motor stator core and coil will generate a large amount of heat due to electromagnetic loss, which is the main heat source of the motor. In order to ensure safety and the working efficiency of the motor, an efficient stator cooling method is needed to reduce the stator temperature rise and improve the thermal performance of the motor, thereby improving the efficiency and output torque of the motor.

[0003] In the patent application file with the application number CN202010746828.7, a kind of axial flux motor stator with cooling structure and axial flux motor are disclosed, comprising: first support structure, the outer surface of its cylindrical bottom plate is symmetrically provided with support column radially distributed in the form of radiation, a plurality of stator slots are formed between the bottom plate and the support column;The stator core wound with variable cross-section conductor made of stator coil is embedded in the stator slot;Sealing sleeve, which tightly wraps around the periphery of the first stator support structure, forms a cooling flow channel;The second stator support structure is assembled with the first stator support structure, and an annular inlet distribution chamber and an outlet liquid chamber are formed on the circumferential outer surface of the second stator support structure, and the two annular chambers are respectively communicated with the cooling flow channel through the cooling medium inlet hole and the cooling medium outlet hole on the bottom plate of the first support structure;The inner side of the second stator support structure is also provided with an insulating cooling medium inlet pipe and an insulating cooling medium outlet pipe. The present application can efficiently and directly cool the motor stator coil. The above-mentioned axial flux permanent magnet motor cooling structure has the following disadvantages: the cooling medium is in direct contact with the stator coil for cooling, and the stator coil is in indirect heat conduction cooling with the stator core. However, due to the existence of low thermal conductivity insulating material between the stator coil and the stator core, the cooling effect of the stator core is not good;A complex first support structure needs to be provided, which not only occupies a part of the cooling flow channel space, resulting in a decrease in the contact area of the stator coil and the cooling medium, but also is made of metal, which is heavy and has eddy current loss during motor operation, reducing the efficiency and power density of the motor.

[0004] Therefore, it is a technical problem to be solved by those skilled in the art to design a stator cooling structure that has high efficiency in cooling the stator core and coil, is easy to implement in engineering, and has a simple structure. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides an axial flux motor stator cooling structure and an axial flux motor, which are used to solve the problems of poor cooling effect on the stator core and complex structure of additional support in the existing axial flux permanent magnet motor cooling structure, and aim to achieve efficient cooling of the axial flux motor stator core and coil without increasing the structural complexity, and improve the motor power density.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, an axial flux motor stator cooling structure is provided, characterized in that it comprises a casing, a stator, an inner support and two front and rear sealing plates; the inner support is arranged inside the casing, and the two sealing plates are arranged at the two ends of the casing, and the sealing plates are connected with the casing and the inner support respectively to form a sealed space. A plurality of stators are distributed in the sealed space in the circumferential direction, the stator comprises a core and a coil, the two ends of the core are respectively provided with pole shoes, the coil is arranged between the pole shoes at the two ends, a limiting groove is arranged on any one of the sealing plates corresponding to the stator, the pole shoes are matched and placed in the limiting groove, and an iron core flow channel is arranged between at least one end of the pole shoe and the corresponding limiting groove, and the iron core flow channel directly exchanges heat with the iron core through the flowing cooling liquid to cool the iron core.

[0007] According to the axial flux motor stator cooling structure provided by the present application, the outer edge of the limiting groove is connected with an outer liquid guide groove, an auxiliary groove is arranged on the pole shoe, the inner edge of the limiting groove is connected with an inner liquid guide groove, and the outer liquid guide groove, the auxiliary groove and the inner liquid guide groove are sequentially communicated to form the iron core flow channel.

[0008] According to the axial flux motor stator cooling structure provided by the present application, the coils of a plurality of stators and the inner wall of the casing have a gap to form a coil outer flow channel, and the iron core flow channel and the coil outer flow channel are communicated; the coils of a plurality of stators and the outer wall of the inner support have a gap to form a coil inner flow channel, and the iron core flow channel and the coil inner flow channel are communicated.

[0009] According to the axial flux motor stator cooling structure provided by the present application, there is a gap between the coils of two circumferentially adjacent stators, and the gap is communicated with the coil outer flow channel and the coil inner flow channel respectively to form a coil inter-flow channel.

[0010] According to the axial flux motor stator cooling structure provided by the present application, a limiting rib is arranged around the limiting groove, the limiting rib is located at the periphery of the coil, the corresponding part of the limiting rib is shared by the coils of two circumferentially adjacent stators, and the thickness of the limiting rib between the coils of two circumferentially adjacent stators is less than or equal to the distance between the coils of two adjacent stators.

[0011] According to the axial flux motor stator cooling structure provided by the application, at least one outer flow channel blocking block is arranged in the coil outer flow channel in the circumferential direction, the outer side of the outer flow channel blocking block abuts against the inner wall of the casing, the inner side of the outer flow channel blocking block abuts against the coil of one of the stators, and the front and back sides of the outer flow channel blocking block abut against the two sealing plates correspondingly.

[0012] According to the axial flux motor stator cooling structure provided by the application, the casing is provided with a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are located on the two sides of the outer flow channel blocking block.

[0013] According to the axial flux motor stator cooling structure provided by the application, at least one inner flow channel blocking block is arranged in the coil inner flow channel in the circumferential direction, the outer side of the inner flow channel blocking block abuts against the coil of one of the stators, the inner side of the inner flow channel blocking block abuts against the outer wall of the inner support, and the front and back sides of the inner flow channel blocking block abut against the two sealing plates correspondingly.

[0014] According to the axial flux motor stator cooling structure provided by the application, the material of the sealing plate is an insulating material. The end surface of the casing is provided with a casing sealing groove, the sealing plate is connected to the end surface of the casing and is provided with a sealing ring extruded in the casing sealing groove. The end surface of the inner support is provided with an inner support sealing groove, the sealing plate is connected to the end surface of the inner support and is provided with a sealing ring extruded in the inner support sealing groove.

[0015] According to another aspect of the application, an axial flux motor is provided, which comprises the axial flux motor stator cooling structure according to any one of the above.

[0016] Overall, compared with the prior art, the axial flux motor stator cooling structure and the axial flux motor provided by the application have the following advantages: 1. The sealing plate is connected to the two ends of the casing and the inner support, the sealing plate is used to form a sealed space to provide a setting space for the stator, a limiting groove is arranged to fix and limit the pole shoes of the stator core, and a core flow channel is arranged between the pole shoes and the limiting groove, so that when the cooling liquid flows in the core flow channel, the cooling liquid can directly contact the stator core and efficiently cool the stator core, thereby solving the problem of poor cooling effect of the stator core of the existing axial flux motor and the problem of local thermal runaway; and the stator part is easy to assemble and fix, no additional support is needed, the structure is simple and compact, and the overall performance of the motor is effectively improved. 2. Specifically propose to open auxiliary grooves on the pole shoe, connect the outer liquid guide groove on the outer edge of the limiting groove, connect the inner liquid guide groove on the inner edge, and then form the core flow channel, so that the cooling liquid can penetrate the surface of the pole shoe, which is beneficial to more sufficient direct contact heat exchange and effectively improves the cooling effect; 3. The outer flow channel blocking block is arranged in the outer flow channel of the coil, and the inner flow channel blocking block is arranged in the inner flow channel of the coil, which can set and control the flow of the cooling liquid in the cooling flow channel, which is beneficial to increase the flow and make the cooling liquid flow through each part sufficiently, thereby ensuring the heat exchange cooling effect; 4. The cooling liquid flow channel is constructed by using lightweight and low conductivity structural components, which reduces the mass of the motor stator part, reduces the structural component loss, and improves the motor efficiency and power density. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional explosion schematic diagram of the axial flux motor stator cooling structure provided by the embodiment of the application.

[0018] Figure 2 is an axial cross-sectional schematic diagram of the axial flux motor stator cooling structure provided by the embodiment of the application.

[0019] Figure 3 is a sealing plate schematic diagram provided by the embodiment of the application.

[0020] Figure 4 is a stator core schematic diagram provided by the embodiment of the application.

[0021] Figure 5 is a machine shell schematic diagram provided by the embodiment of the application.

[0022] Figure 6 is an inner support schematic diagram provided by the embodiment of the application.

[0023] Figure 7 is a cooling liquid flow path schematic diagram provided by the embodiment of the application.

[0024] Figure 8 is a cooling liquid flow path local enlargement schematic diagram provided by the embodiment of the application.

[0025] Figure 9 is a stator cooling flow channel schematic diagram provided by the embodiment of the application.

[0026] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein: 1-front sealing plate, 2-machine shell, 3-stator, 4-inner support, 5-rear sealing plate, 6-cooling flow channel, 7-outer flow channel blocking block, 8-inner flow channel blocking block; 11-limiting groove, 12-outer liquid guide groove, 13-inner liquid guide groove, 14-limiting rib, 15-inner through hole, 16-outer through hole; 21-outer ring fixing screw hole, 22-casing sealing groove; 31-iron core, 32-coil, 311-pole shoe, 312-accessory slot, 41-inner ring fixing screw hole, 42-inner support sealing groove, 61-liquid inlet, 62-liquid outlet, 63-coil outer flow channel, 64-coil inner flow channel, 65-coil inter-flow channel, 66-iron core flow channel. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0028] Please refer to Figure 1 The embodiment provides an axial flux motor stator cooling structure, which comprises a casing 2, a stator 3, an inner support 4 and two front and rear sealing plates; the inner support 4 is arranged inside the casing 2, two sealing plates are arranged at both ends of the casing 2, and the sealing plates are connected with the casing 2 and the inner support 4 respectively to form a sealed space. A plurality of stators 3 are distributed in the sealed space in a circumferential direction, the stator 3 comprises an iron core 31 and a coil 32, both ends of the iron core 31 are respectively provided with a pole shoe 311, the coil 32 is arranged between the pole shoes 311 at both ends, a limiting groove 11 is arranged on any one of the sealing plates corresponding to the stator 3, the pole shoe 311 is matched and placed in the limiting groove 11, an iron core flow channel 66 is arranged between at least one end of the pole shoe 311 and the corresponding limiting groove 11, and the iron core flow channel 66 directly exchanges heat with the iron core 31 by flowing cooling liquid to cool the iron core 31.

[0029] The axial flux motor stator cooling structure in the embodiment comprises a front sealing plate 1, a casing 2, a stator 3, an inner support 4 and a rear sealing plate 5, the inner support 4 is coaxially arranged inside the casing 2, the front sealing plate 1 is connected with the end face of the casing 2 and the end face of the inner support 4 at the front end respectively, the rear sealing plate 5 is connected with the end face of the casing 2 and the end face of the inner support 4 at the rear end respectively, so that the two sealing plates, the casing 2 and the inner support 4 form a sealed space, and a plurality of stators 3 are distributed in the sealed space in a circumferential direction and arranged between the inner support 4 and the casing 2.

[0030] Both the front sealing plate 1 and the rear sealing plate 5 have multiple circumferentially distributed limiting grooves 11, which serve to fix the stator core 31. The size of the limiting grooves 11 is the same as that of the pole shoes 311 of the stator core 31, and the number of limiting grooves 11 is the same as the number of stator cores 31. The pole shoes 311 at both ends of the stator core 31 are placed in the limiting grooves 11 on the two sealing plates to achieve limiting and fixing. Furthermore, a core flow channel 66 is formed between the limiting groove 11 of at least one sealing plate and the corresponding pole shoe 311. Cooling liquid flows in the core flow channel 66, allowing the cooling liquid to directly contact the core 31 for direct heat exchange and cooling, which is beneficial to improving the cooling effect.

[0031] Furthermore, the sealing plate may have an opening in the middle. Each of the sealing plates is sealed to the housing 2 at its outer edge and to the inner support 4 at its inner edge to form a sealed space. The inner support 4 also has a through hole, which can be used to mount other components of the motor. The shape and depth of the limiting groove 11 can be matched with the pole shoe 311.

[0032] refer to Figure 1 , Figure 3 and Figure 4 The outer edge of the limiting groove 11 is connected to an outer liquid guide groove 12, the pole shoe 311 has an auxiliary groove 312, and the inner edge of the limiting groove 11 is connected to an inner liquid guide groove 13. The outer liquid guide groove 12, the auxiliary groove 312, and the inner liquid guide groove 13 are sequentially connected to form the core flow channel 66. In this embodiment, an outer liquid guide groove 12 is formed radially outward along the outer edge of the limiting groove 11, and an inner liquid guide groove 13 is formed radially inward along the inner edge of the limiting groove 11. The outer liquid guide groove 12, the inner liquid guide groove 13, and the auxiliary groove 312 of the stator core 31 together constitute the core flow channel 66. The coolant directly contacts the stator core 31 through the core flow channel 66, providing efficient and direct cooling. "Inner and outer" refers to radial directions.

[0033] refer to Figure 4 The stator 3 consists of a core 31 and a coil 32. The coil 32 is wound around the surface of the core 31. The longitudinal cross-section of the core 31 is I-shaped. There are protruding pole shoes 311 on the upper and lower end faces, which enhance magnetic conductivity and limit the axial displacement of the stator coil 32. In addition, auxiliary grooves 312 are formed on the upper and lower end faces, through which coolant flows and directly contacts the stator core 31, providing efficient and direct cooling.

[0034] In other embodiments, the core flow channel 66 can also be configured in other forms, for example, the core flow channel 66 can be formed by grooving the limiting groove 11, or the core flow channel 66 can be formed by grooving both the pole shoe 311 and the limiting groove 11, and the specific form is not limited. In addition, the core flow channel 66 can be formed between the core 31 and one sealing plate, or the core flow channel 66 can be formed between the core 31 and two sealing plates, and the specific form is not limited.

[0035] Further, gaps are formed between the coils 32 of the plurality of stators 3 and the inner wall of the casing 2 to form coil outer flow channels 63, and the core flow channel 66 communicates with the coil outer flow channels 63; gaps are formed between the coils 32 of the plurality of stators 3 and the outer wall of the inner support 4 to form coil inner flow channels 64, and the core flow channel 66 communicates with the coil inner flow channels 64.

[0036] Further, gaps are formed between the coils 32 of the plurality of stators 3 and the inner wall of the casing 2 to form coil outer flow channels 63, and the core flow channel 66 communicates with the coil outer flow channels 63; gaps are formed between the coils 32 of the plurality of stators 3 and the outer wall of the inner support 4 to form coil inner flow channels 64, and the core flow channel 66 communicates with the coil inner flow channels 64.

[0037] In some embodiments, the limiting groove 11 is provided with a limiting rib 14 around the limiting groove 11, the limiting rib 14 is located at the periphery of the coil 32, and the corresponding part of the limiting rib 14 is shared by two circumferentially adjacent coils 32 of the stator 3, and the thickness of the limiting rib 14 between the two circumferentially adjacent coils 32 of the stator 3 is less than or equal to the distance between the two adjacent coils 32. In this embodiment, the limiting ribs 14 are distributed around the limiting groove 11 between the adjacent limiting grooves 11, which can fix the stator coils 32 and strengthen the structural strength of the sealing plate. Alternatively, the thickness of the limiting rib 14 between the two coils 32 in the circumferential direction of the sealing plate can be the same as the distance between the adjacent coils 32, so as to better fix the coils 32.

[0038] In some embodiments, referring to Figure 2 , at least one outer flow channel blocking block 7 is arranged in the circumferential direction of the coil outer flow channel 63, the outer side of the outer flow channel blocking block 7 abuts against the inner wall of the casing 2, the inner side of the outer flow channel blocking block 7 abuts against the coil 32 of one of the stators 3, and the front and back sides of the outer flow channel blocking block 7 abut against the two sealing plates. The outer flow channel blocking block 7 is used to adjust and plan the flow path of the cooling liquid in the coil outer flow channel 63.

[0039] In some embodiments, referring to Figure 5 , the casing 2 is provided with a liquid inlet 61 and a liquid outlet 62 of the cooling liquid, and the liquid inlet 61 and the liquid outlet 62 are located on the two sides of the outer flow channel blocking block 7. So that the cooling liquid entering the flow channel can fully flow and exchange heat before flowing out.

[0040] In some embodiments, at least one inner flow channel blocking block 8 is arranged in the circumferential direction of the coil inner flow channel 64, the outer side of the inner flow channel blocking block 8 abuts against the coil 32 of one of the stators 3, the inner side abuts against the outer wall of the inner support 4, and the front and back sides correspondingly abut against the two sealing plates. The inner flow channel blocking block 8 is used to adjust and plan the flow path of the cooling liquid in the coil inner flow channel 64.

[0041] Reference Figure 2 In some specific embodiments, three outer flow channel blocking blocks 7 can be uniformly arranged in the circumferential direction of the coil outer flow channel 63, and one inner flow channel blocking block 8 can be arranged in the coil inner flow channel 64, so that the cooling liquid flows around the segmented stator in the form of a "orthogonal circular ring", thereby enhancing the flow and heat dissipation performance under the action of the channel flow guide structure, i.e., the blocking block.

[0042] In some embodiments, the material of the sealing plate is an insulating material; Reference Figure 5 The end surface of the casing 2 is provided with a casing sealing groove 22, and the sealing plate is connected to the end surface of the casing 2 and is provided with a sealing ring in the casing sealing groove 22; Reference Figure 6 The end surface of the inner support 4 is provided with an inner support sealing groove 42, and the sealing plate is connected to the end surface of the inner support 4 and is provided with a sealing ring in the inner support sealing groove 42.

[0043] In the present embodiment, the front sealing plate 1 and the rear sealing plate 5 can be made of high-strength insulating materials. Without loss of generality, in the present embodiment, the sealing plates are made of glass fiber-resin composite materials. In order to ensure the sealing performance in the cavity of the stator 3, the casing sealing groove 22 and the inner support sealing groove 42 are opened on the casing 2 and the inner support 4, and the matching sealing rubber ring is embedded in the sealing groove, and then tightly fixed through the plurality of inner ring fixing screw holes 41 and outer ring fixing screw holes 21. The inner and outer edges of the sealing plate are punched with inner through holes 15 and outer through holes 16, which are locked with the inner support 4 and the casing 2 through bolts, respectively, and the sealing ring is combined to ensure the overall sealing performance.

[0044] In other embodiments, an axial flux motor is also provided, which includes the axial flux motor stator cooling structure of any one of the above.

[0045] In some specific embodiments, an axial flux motor stator cooling structure is provided, which aims to construct a cooling liquid flow channel with lightweight structural members, to achieve efficient cooling of the axial flux motor stator core and coil, and to improve the power density of the motor. Figures 1 to 9An embodiment of axial flux motor stator cooling structure is provided. The axial flux motor stator cooling structure comprises front sealing plate 1, casing 2, stator 3, inner support 4, rear sealing plate 5, outer flow channel blocking block 7 and inner flow channel blocking block 8, each component is assembled and installed inside the casing 2 to form a cooling flow channel 6. The front sealing plate 1 and the rear sealing plate 5 are the same in structure, which are disc-shaped with a hole in the middle.

[0046] During installation, the core 31 wound with the coil 32 is embedded in the limiting groove 11 of the front sealing plate 1, the outer surface of the core pole shoe 311 is tightly attached to the surface of the limiting groove 11, and they can be tightly fixed together by glue. The front sealing plate 1 is locked with the casing 2 and the inner support 4 by bolts, and the outer flow channel blocking block 7 and the inner flow channel blocking block 8 are respectively inserted between the coil 32 and the casing 2 and the inner support 4 to guide the cooling liquid flow path. Then, the rear sealing plate 5 is covered, and the surface of the core pole shoe 311 is pasted together with the limiting groove of the rear sealing plate 5 by glue. Finally, the rear sealing plate 5 is locked with the casing 2 and the inner support 4 by bolts. After installation is completed, the components are tightly matched, and the cavity left inside constitutes the cooling flow channel 6.

[0047] Reference Figure 7 , Figure 8 and Figure 9 , the cooling flow channel 6 comprises: liquid inlet 61, liquid outlet 62, coil outer flow channel 63, coil inner flow channel 64, coil inter-flow channel 65, and core flow channel 66. The coil outer flow channel 63 is composed of the cavity between the outer circular surface of the coil and the inner wall surface of the casing 2, the coil inner flow channel 64 is composed of the cavity between the inner circular surface of the coil and the outer wall surface of the inner support 4, and the coil inter-flow channel 65 is composed of the cavity between the side wall surfaces of the adjacent two stator coils 32. The above-mentioned coil outer flow channel 63, coil inner flow channel 64 and coil inter-flow channel 65 jointly constitute a coil flow channel, and the cooling liquid directly contacts the stator coil through the coil flow channel. The core flow channel 66 is composed of the cavity between the auxiliary groove 312 of the end surface of the core 31 and the sealing plate, and the cooling liquid directly contacts the stator core 31 through the auxiliary groove 312. The cooling liquid flows into the cooling flow channel 6 through the liquid inlet 61, and flows out of the cooling flow channel through the liquid outlet 62 under the guidance of the channel flow guide structure and the flow channel blocking block. In this process, the core 31 and the coil 32 are directly contacted with the cooling liquid entering the cooling flow channel, and the flow and heat dissipation performance are enhanced under the action of the channel flow guide structure, i.e. the blocking block. The cooling liquid flows in a "orthogonal circular ring" type around the segmented stator 3, directly contacts the coil 32 and the core 31 to achieve heat exchange, and realizes sufficient cooling of the stator components. Figure 8 Only for better display of the specific distribution and flow position of the cooling flow channel 6 of the single stator 3, without limitation to the specific setting structure.

[0048] Those skilled in the art can easily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An axial flux motor stator cooling structure, characterized by, The utility model provides a kind of motor, including shell (2), stator (3), inner support (4) and two sealing plates before and after;The inner support (4) is arranged in the inside of the shell (2), two sealing plates are arranged at the both ends of the shell (2), and the sealing plate is connected with the shell (2) and the inner support (4) respectively to form a sealed space; Multiple stators (3) are distributed in the sealed space along the circumference, and the stator (3) includes an iron core (31) and a coil (32), both ends of the iron core (31) are respectively provided with a pole shoe (311), the coil (32) is arranged between the pole shoes (311) at both ends, a limiting groove (11) is arranged on any sealing plate corresponding to the stator (3), the pole shoe (311) is matched and placed in the limiting groove (11), and an iron core flow channel (66) is arranged between at least one end of the pole shoe (311) and the corresponding limiting groove (11), and the iron core flow channel (66) directly exchanges heat with the iron core (31) by flowing cooling liquid.

2. The axial flux motor stator cooling structure of claim 1, wherein, The outer edge of the limiting groove (11) is connected with an outer liquid guide groove (12), the pole shoe (311) is provided with an auxiliary groove (312), and the inner edge of the limiting groove (11) is connected with an inner liquid guide groove (13), the outer liquid guide groove (12), the auxiliary groove (312) and the inner liquid guide groove (13) are sequentially communicated to form the iron core flow channel (66).

3. The axial flux motor stator cooling structure of claim 1, wherein, The coil (32) of the multiple stators (3) and the inner wall of the shell (2) have a gap to form a coil outer flow channel (63), and the iron core flow channel (66) is communicated with the coil outer flow channel (63); the coil (32) of the multiple stators (3) and the outer wall of the inner support (4) have a gap to form a coil inner flow channel (64), and the iron core flow channel (66) is communicated with the coil inner flow channel (64).

4. The axial flux motor stator cooling structure of claim 3, wherein, There is a gap between the coils (32) of two circumferentially adjacent stators (3), and the gap is communicated with the coil outer flow channel (63) and the coil inner flow channel (64) respectively to form a coil inter-flow channel (65).

5. The axial flux motor stator cooling structure of any one of claims 1-4, wherein, The limiting ribs (14) are arranged around the limiting groove (11) on the outer periphery of the limiting groove (11), the limiting ribs (14) are located on the outer periphery of the coil (32), the corresponding part of the limiting rib (14) is shared by the coils (32) of two circumferentially adjacent stators (3), and the thickness of the limiting rib (14) between the coils (32) of two circumferentially adjacent stators (3) is less than or equal to the distance between the coils (32) of two adjacent stators (3).

6. The axial flux motor stator cooling structure of claim 3, wherein, At least one outer flow channel blocking block (7) is arranged along the circumference in the coil outer flow channel (63), one side of the outer flow channel blocking block (7) abuts against the inner wall of the shell (2), the other side abuts against the coil (32) of one of the stators (3), and the front and back sides abut against the two sealing plates.

7. The axial flux motor stator cooling structure of claim 6, wherein, The shell (2) is provided with a liquid inlet (61) and a liquid outlet (62) of cooling liquid, and the liquid inlet (61) and the liquid outlet (62) are located on the two sides of the outer flow channel blocking block (7).

8. The axial flux motor stator cooling structure of claim 3, wherein, At least one inner flow channel blocking block (8) is provided in the inner flow channel (64) along the circumferential direction. The outer side of the inner flow channel blocking block (8) abuts against the coil (32) of one of the stators (3), the inner side abuts against the outer wall of the inner support (4), and the front and rear sides abut against the two sealing plates respectively.

9. An axial flux motor stator cooling structure as claimed in any one of claims 1-4, wherein, The sealing plate is made of an insulating material; The end face of the housing (2) is provided with a housing sealing groove (22), and the sealing plate is connected to the end face of the housing (2) and a sealing ring is squeezed in the housing sealing groove (22). The inner support (4) has an inner support sealing groove (42) on its end face. The sealing plate is connected to the end face of the inner support (4) and a sealing ring is squeezed in the inner support sealing groove (42).

10. An axial flux electric machine characterized by, The stator cooling structure of the axial flux motor included in any one of claims 1-9 above.

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