A kind of annular winding axial flux motor stator cooling mechanism

Abstract

This invention provides a stator cooling mechanism for an axial flux motor with annular windings, comprising an axial flux motor stator with annular windings and a cooling mechanism. The stator of the axial flux motor with annular windings includes a stator core and a plurality of annular windings wound on the stator core. The stator core is annular, and the portions of the annular windings extending beyond the outer annular surface of the stator core form outward extensions, while the portions of the annular windings extending beyond the inner annular surface of the stator core form inward extensions. The cooling mechanism includes an inner cooling ring pipe, an outer cooling ring pipe, and an annular branch pipe. The inner cooling ring pipe contacts and is tangentially arranged with each of the inward extensions in sequence, and the outer cooling ring pipe contacts and is tangentially arranged with each of the inward extensions in sequence. The annular branch pipe is arranged circumferentially along the annular windings, and its two ends are respectively connected to the inner cooling ring pipe and the outer cooling pipe. Each of the inner and outer cooling ring pipes is provided with a liquid inlet port, and the two liquid inlets pass through the middle of two adjacent inward extensions and extend toward the center of the stator core.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a stator cooling mechanism for an axial flux motor with annular winding. Background Technology

[0002] Axial flux motors generate heat during operation due to the heat generated by the stator windings. To prevent heat accumulation from damaging the motor or affecting its normal operation, a cooling mechanism is often designed for the stator. For axial flux motors with toroidal windings, which are characterized by their compact structure and thinness, the design of the cooling mechanism and its integration with the motor present significant challenges. Traditional cooling methods either rely on natural air cooling or require a bulky water-cooling structure. The former has poor cooling efficiency, while the latter not only increases the motor's size but also often creates a distance between the water-cooling mechanism and the toroidal winding, requiring indirect cooling of the toroidal winding through the stator core rather than direct heat exchange with the heat source, thus failing to achieve optimal cooling performance.

[0003] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a stator cooling mechanism for an annular winding axial flux motor that is scientifically designed, compact in structure, has good cooling effect, and is highly practical.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a stator cooling mechanism for an annular winding axial flux motor, comprising an annular winding axial flux motor stator and a cooling mechanism. The annular winding axial flux motor stator includes a stator core and a plurality of annular windings wound on the stator core. The stator core is annular, with the portions of the annular windings extending beyond the outer annular surface of the stator core forming outwardly protruding sections, and the portions of the annular windings extending beyond the inner annular surface of the stator core forming inwardly protruding sections. The cooling mechanism includes an inner cooling ring pipe and an outer cooling ring pipe. The inner cooling ring pipe is sequentially and tangentially connected to each of the inner extension sections, and the outer cooling ring pipe is sequentially and tangentially connected to each of the outer extension sections. The ring pipe is arranged circumferentially along the annular winding. The two ends of the ring pipe are respectively connected to the inner cooling ring pipe and the outer cooling pipe. Each of the inner cooling ring pipe and the outer cooling ring pipe is provided with a liquid passage port. The two liquid passage ports extend from the middle of two adjacent inner extension sections toward the center of the stator core.

[0006] Based on the above, the inner cooling ring pipe includes a first inner ring pipe segment, and a first annular groove is formed on the inner ring surface of the stator core corresponding to the first inner ring pipe segment, the first inner ring pipe segment being fitted into the first annular groove; the outer cooling ring pipe includes a first outer ring pipe segment, and a second annular groove is formed on the outer ring surface of the stator core corresponding to the first outer ring pipe segment, the first outer ring pipe segment being fitted into the second annular groove; the annular branch pipe includes a first branch ring pipe segment, the first branch ring pipe segment being in contact with the inner circumferential surface of the annular winding, and a branch pipe annular groove is formed on the stator core for each of the first branch ring pipe segments, the first branch ring pipe segment being fitted into the branch pipe annular groove; wherein, the first annular groove, the second annular groove, and the branch pipe annular groove are all located within the area enclosed by a plurality of annular windings.

[0007] Based on the above, the stator cooling mechanism of the annular winding axial flux motor includes an inner retaining ring and an outer retaining ring. The outer circumferential surface of the inner retaining ring has grooves corresponding to several inner protruding sections. The inner cooling ring pipe includes a second inner ring pipe section. The outer circumferential surface of the inner retaining ring has a third annular groove corresponding to the second inner ring pipe section, and the second inner ring pipe section is fitted into the third annular groove. The inner circumferential surface of the outer retaining ring has grooves corresponding to several outer protruding sections. The outer cooling ring pipe includes a second outer ring pipe section. The inner circumferential surface of the outer retaining ring has a fourth annular groove corresponding to the second outer ring pipe section, and the second outer ring pipe section is fitted into the fourth annular groove. The annular branch pipe includes a second branch ring pipe section, which is in contact with the outer circumferential surface of the annular winding.

[0008] Based on the above, the inner retaining ring is installed on the inner side of the stator core ring by screws, and the outer retaining ring is installed on the outer side of the stator core ring by screws.

[0009] Based on the above, a certain number of auxiliary ring pipes can be added around the annular branch pipe. The two ends of the auxiliary ring pipes are respectively connected to the inner cooling ring pipe and the outer cooling pipe. The auxiliary ring pipes are inserted side by side into the position of the annular branch pipe. Each auxiliary ring pipe avoids each annular winding and is laid on the stator core between the two annular windings. The outer contour surface of the stator core has an auxiliary branch pipe annular groove corresponding to each auxiliary ring pipe segment. The auxiliary ring pipe includes a first auxiliary ring pipe segment and a second auxiliary ring pipe segment. The two ends of the first auxiliary ring pipe segment are respectively connected to the first inner ring pipe segment and the first outer ring pipe segment. The first auxiliary ring pipe segment is locked in the auxiliary branch pipe annular groove. The two ends of the second auxiliary ring pipe segment are respectively connected to the second inner ring pipe segment and the second outer ring pipe segment. An axial pipe hole is opened in the middle of the adjacent tooth groove position on the end face of the inner retaining ring and the outer retaining ring. The two ends of the second auxiliary ring pipe segment are locked in the auxiliary branch pipe annular groove through the axial pipe hole.

[0010] Based on the above, the first inner ring pipe section and the second inner ring pipe section share a liquid inlet port, and the first outer ring pipe section and the second outer ring pipe section share another liquid inlet port.

[0011] This invention has outstanding substantive features and significant progress compared to the prior art. Specifically, this invention achieves direct heat exchange with the annular winding by having the inner cooling ring pipe sequentially contact and tangent to several inner extension sections, and the outer cooling pipe sequentially contacting and tangent to several outer extension sections. The annular branch pipe is attached to each annular winding, and the two liquid inlet ports are respectively connected to the inlet pipe and the outlet pipe. Cooling water first enters from the inner cooling ring pipe / outer cooling ring pipe, flows through the parallel annular branch pipes, and then flows out from the outer cooling ring pipe / inner cooling ring pipe, thereby improving the cooling effect. Furthermore, the tangential and attached arrangement ensures the compactness of the structure and its small size. It has the advantages of scientific design, compact structure, good cooling effect, and strong practicality.

[0012] Furthermore, the inner diameter of the annular branch pipe can be set to be smaller, and its resistance is greater than that of the inner cooling ring pipe and the outer cooling ring pipe. In this way, when the coolant enters, it will first fill the inner cooling ring pipe / outer cooling ring pipe, ensuring that there is liquid flow in each annular branch pipe and avoiding the formation of dead zones in local branch pipes.

[0013] Furthermore, the first annular groove, the second annular groove, and the multiple branch annular grooves are all formed on the surface of the stator core, and the first inner annular tube section, the first outer annular tube section, and the first branch annular tube section are respectively inserted into them, so as to exchange heat from the inside of the annular winding without increasing the volume of the stator.

[0014] Furthermore, the grooves on the inner and outer retaining rings can hold the annular winding. The third annular groove is formed on the outer circumferential surface of the inner retaining ring, facilitating the insertion of the second inner annular tube segment. The fourth annular groove is formed on the inner circumferential surface of the outer retaining ring, facilitating the insertion of the second outer annular tube segment. The second branch annular tube segment is in contact with the outer circumferential surface of the annular winding and can be neatly housed in the gap on the side of the stator core, allowing heat exchange from the outside of the annular winding. This achieves both fixation and storage, minimizing the impact on the stator volume. Especially when used in conjunction with the first inner annular tube segment, the first outer annular tube segment, and the first branch annular tube segment, heat exchange can be carried out simultaneously from both the inner and outer sides of the annular winding, thereby greatly improving the heat exchange effect. The first inner annular tube segment and the second inner annular tube segment share one liquid inlet, and the first outer annular tube segment and the second outer annular tube segment share another liquid inlet, further simplifying the cooling structure.

[0015] Furthermore, the auxiliary ring tube is inserted into the annular groove of the auxiliary branch tube on the outer contour surface of the stator core, maximizing the use of the outer surface space of the stator core in the limited space of the annular winding axial flux motor stator, and increasing the heat dissipation area of ​​the inner cooling ring tube and the outer cooling tube; the installation form of the auxiliary ring tube is similar to that of the annular branch tube, and its assembly process is easy to implement. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 This is a three-dimensional structural diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 1.

[0018] Figure 2 This is a schematic diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 1, with the stator core and the annular winding near the liquid inlet hidden.

[0019] Figure 3 This is a schematic diagram of the pipeline layout structure within the annular winding in Example 1.

[0020] Figure 4 This is a schematic diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 1, with the annular winding concealed.

[0021] Figure 5 This is a schematic diagram of the stator core structure in Example 1.

[0022] Figure 6 This is a front view of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 2.

[0023] Figure 7 This is a schematic diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 2, with the stator core, outer retaining ring, and inner retaining ring concealed.

[0024] Figure 8 This is a schematic diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 2, with the stator core and annular winding concealed.

[0025] Figure 9 This is a schematic diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 2, with the stator core, annular winding, and part of the cooling pipes hidden.

[0026] Figure 10 This is a front view of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 3.

[0027] Figure 11 This is a schematic diagram of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 3, after concealing the stator core and part of the annular winding.

[0028] Figure 12 This is a schematic diagram of the structure of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 3, which adds an auxiliary ring tube.

[0029] Figure 13 This is a schematic diagram of the structure of the stator cooling mechanism of the annular winding axial flux motor in Embodiment 3, with an auxiliary ring tube added and part of the auxiliary ring tube hidden.

[0030] In the diagram: 1. Stator core; 2. Annular winding; 3. Fluid inlet port; 301.a Fluid inlet port; 302.b Fluid inlet port; 303.c Fluid inlet port; 304.d Fluid inlet port; 305.e Fluid inlet port; 306.f Fluid inlet port; 4. First branch ring pipe segment; 5. First inner ring pipe segment; 6. Second inner ring pipe segment; 7. First outer ring pipe segment; 8. Second outer ring pipe segment; 9. First annular groove; 10. Second annular groove; 11. Third annular groove; 12. Fourth annular groove; 13. Outer retaining ring; 14. Inner retaining ring; 15. Concave screw; 16. Branch pipe annular groove; 17. Second branch ring pipe segment; 21. Outer extension segment; 22. Inner extension segment; 23. First auxiliary branch ring pipe segment; 24. Second auxiliary branch ring pipe segment; 25. Auxiliary branch pipe annular groove; 26. Axial pipe hole. Detailed Implementation

[0031] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0032] Example 1

[0033] like Figure 1-5 As shown, a stator cooling mechanism for an annular winding axial flux motor includes an annular winding axial flux motor stator and a cooling mechanism. The annular winding axial flux motor stator includes a stator core 1 and a plurality of annular windings 2 wound on the stator core 1. The stator core 1 is annular. The portion of the annular winding 2 that extends beyond the outer annular surface of the stator core 1 forms an outer extension section 21, and the portion of the annular winding 2 that extends beyond the inner annular surface of the stator core 1 forms an inner extension section 22. The cooling mechanism includes an inner cooling ring pipe, an outer cooling ring pipe, and an annular branch pipe 16 corresponding to each of the annular windings 2. The inner cooling ring pipe contacts and is tangentially arranged with each of the inner extension sections 22 in sequence, and the outer cooling ring pipe contacts and is tangentially arranged with each of the outer extension sections 21 in sequence. The annular branch pipe is arranged circumferentially along the annular windings 2, and both ends of the annular branch pipe are connected to the inner cooling ring pipe and the outer cooling pipe, respectively, so as to directly contact and exchange heat with the annular windings 2.

[0034] To simplify the inlet and outlet liquid structure, a liquid passage port 3 is provided on the inner cooling ring pipe and the outer cooling ring pipe respectively. The two liquid passage ports 3 are liquid passage port a 301 and liquid passage port b 302. The two liquid passage ports 3 extend from the middle of the two adjacent inner extension sections 22 toward the center of the stator core 1. Liquid passage port a 301 and liquid passage port b 302 are used to connect the liquid inlet pipe and liquid outlet pipe on the stator shaft respectively, so that water is centrally introduced into the stator shaft and centrally led out of the stator shaft. The cooling water first enters from the inner cooling ring pipe / outer cooling ring pipe, flows through several parallel annular branch pipes, and then flows out from the outer cooling ring pipe / inner cooling ring pipe.

[0035] To ensure that coolant flows through each annular branch pipe, the inner diameter of the annular branch pipe is smaller than the inner diameter of the inner cooling ring pipe / the inner diameter of the outer cooling ring pipe. Because the annular branch pipe is thinner, its resistance is greater than that of the inner cooling ring pipe and the outer cooling ring pipe. In this way, when the coolant enters, it will first fill the inner cooling ring pipe / the outer cooling ring pipe, ensuring that liquid flows in each annular branch pipe and avoiding the formation of dead zones in some branch pipes.

[0036] This embodiment primarily achieves cooling from the inside of the annular winding 2. Specifically, the inner cooling annular pipe includes a first inner annular pipe section 5, and a first annular groove 9 is formed on the inner annular surface of the stator core 1 corresponding to the first inner annular pipe section 5, with the first inner annular pipe section 5 fitting within the first annular groove 9. The outer cooling annular pipe includes a first outer annular pipe section 7, and a second annular groove 10 is formed on the outer annular surface of the stator core 1 corresponding to the first outer annular pipe section 7. The stator core 1 is fitted into the second annular groove 10; the annular branch pipe includes a first branch annular pipe section 4, which is in contact with the inner circumferential surface of the annular winding 2. The stator core 1 has a branch pipe annular groove 16 for each of the first branch annular pipe sections 4, and the first branch annular pipe section 4 is fitted into the branch pipe annular groove 16; wherein, the first annular groove 9, the second annular groove 10 and the branch pipe annular groove 16 are all located in the area enclosed by a plurality of annular windings 2, so that heat exchange can be carried out from the inside of the annular windings 2 without increasing the volume of the stator.

[0037] In practical use, an inlet pipe and an outlet pipe need to be set on the stator shaft. The stator core 1 is installed on the stator shaft, and the two liquid inlet ports 3 are connected to the inlet pipe and the outlet pipe respectively. The cooling water can enter from the first inner ring pipe section 5 or the first outer ring pipe section 7 first, and then flow through several parallel first branch ring pipe sections 4. Finally, it flows out from the first outer ring pipe section 7 or the first inner ring pipe section 5, and directly contacts the inner side of the annular winding 2 for direct heat exchange. The opening of the first annular groove 9, the second annular groove 10 and the branch pipe annular groove 17 can achieve cooling of the annular winding 2 without increasing the volume.

[0038] Example 2

[0039] like Figure 6-9 As shown, the difference between this embodiment and Embodiment 1 is that cooling is mainly achieved from the outside of the annular winding 2. Specifically, the annular winding axial flux motor stator cooling mechanism includes an inner retaining ring 14 and an outer retaining ring 13. The outer circumferential surface of the inner retaining ring 14 is provided with grooves corresponding to several inner protruding sections 22. The inner cooling ring tube includes a second inner ring tube section 6. The outer circumferential surface of the inner retaining ring 14 is provided with a third annular groove 11 corresponding to the second inner ring tube section 6, and the second inner ring tube section 6 is engaged in the third annular groove 11. The inner circumferential surface of the outer retaining ring 13 is provided with grooves corresponding to several outer protruding sections 21. The outer cooling ring tube includes a second outer ring tube section 8. The inner circumferential surface of the outer retaining ring 13 is provided with a fourth annular groove 12 corresponding to the second outer ring tube section 8, and the second outer ring tube section 8 is engaged in the fourth annular groove 12. The annular branch pipe includes a second branch annular pipe section 17, which is in contact with the outer circumferential surface of the annular winding 2 and can be housed in the gap on the side of the stator core 1 without affecting its overall thickness.

[0040] In practical use, it is still necessary to set up inlet and outlet pipes on the stator shaft, and install the inner retaining ring 14 on the stator shaft. In this embodiment, the two liquid inlet ports 3 are c liquid inlet port 303 and d liquid inlet port 304, so that c liquid inlet port 303 is connected to the inlet pipe and d liquid inlet port 304 is connected to the outlet pipe. The cooling water can enter from the second inner ring pipe section 6 or the second outer ring pipe section 8 first, and then flow through several parallel second branch ring pipe sections 17, and finally flow out from the second outer ring pipe section 8 or the second inner ring pipe section 6, directly contacting the outside of the annular winding 2 and directly exchanging heat. The inner retaining ring 14 and the outer retaining ring 13 can fix the cooling water pipe and store it at the same time, so as to minimize the impact on the stator volume.

[0041] For ease of installation, the inner retaining ring 14 is installed on the inner side of the stator core 1 ring by screws, and the outer retaining ring 13 is installed on the outer side of the stator core 1 ring by screws. Specifically, the screws are recessed screws 15, which can keep the surface smooth and as small as possible, making it easy to connect with the stator shaft.

[0042] Example 3

[0043] like Figure 10 and Figure 11 As shown, this embodiment combines the cooling pipes in Embodiment 1 and Embodiment 2, and performs heat exchange simultaneously from both the inner and outer sides of the annular winding 2, thereby achieving a better heat exchange effect. In order to further simplify the liquid inlet and outlet structure, the first inner ring pipe section 5 and the second inner ring pipe section 6 share a liquid inlet port 3, and the first outer ring pipe section 7 and the second outer ring pipe section 8 share another liquid inlet port 3. The two liquid inlet ports 3 are e liquid inlet port 305 and f liquid inlet port 306.

[0044] like Figure 12 and Figure 13 As shown, to further improve the cooling effect of the cooling mechanism, without increasing the size of the motor, a certain number of auxiliary ring pipes can be added around the annular branch pipe. The two ends of each auxiliary ring pipe are connected to the inner cooling ring pipe and the outer cooling pipe, respectively. The auxiliary ring pipes have a certain heat exchange function similar to the annular branch pipe. Each auxiliary ring pipe includes a first auxiliary ring pipe section 23 and a second auxiliary ring pipe section 24. Specifically, the first auxiliary ring pipe section 23 utilizes the outer contour surface of the stator core 1 between every two first ring pipe sections 4 in Embodiment 1. The outer contour surface of the stator core 1 corresponds to each... The first auxiliary ring pipe segment 23 is provided with an auxiliary branch pipe annular groove 25; the second auxiliary ring pipe segment 24 utilizes the outer contour surface of the stator core 1 between every two second auxiliary ring pipe segments 17 in embodiment 2. The outer contour surface of the stator core 1 is provided with an auxiliary branch pipe annular groove 25 corresponding to each second auxiliary ring pipe segment 24. An axial pipe hole 26 is provided in the middle of the adjacent tooth groove position on the end face of the inner retaining ring 14 and the outer retaining ring 13. The two ends of the second auxiliary ring pipe segment 24 are engaged in the auxiliary branch pipe annular groove 25 through the axial pipe hole 26.

[0045] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application. These improvements and modifications should also be considered within the protection scope of this application. For example, Embodiment 3 only describes two auxiliary ring pipe forms under normal circumstances. The auxiliary ring pipe has two forms for each of the external cooling ring pipe and the internal cooling ring pipe connected to its two ends. Each end of the auxiliary ring pipe can be connected to one or two forms. Apart from the two structures of the first auxiliary ring pipe segment and the second auxiliary ring pipe segment, the auxiliary ring pipe can also form seven other structural forms. These seven structural forms are considered to be variations of the auxiliary ring pipe form in Embodiment 3.

Claims

1. A cooling mechanism for a stator of a ring-winding axial flux motor, comprising a ring-winding axial flux motor stator and a cooling mechanism, the ring-winding axial flux motor stator comprising a stator core and a plurality of ring windings wound on the stator core, the stator core being annular, and portions of the ring windings passing through an outer ring face of the stator core forming overhanging segments, and portions of the ring windings passing through an inner ring face of the stator core forming overhanging segments, characterized in that: the cooling mechanism comprises an inner cooling ring pipe, an outer cooling ring pipe, and a ring-shaped branch pipe corresponding to each of the ring windings, the inner cooling ring pipe is in contact with and tangent to each of the inner overhanging segments in sequence, the outer cooling ring pipe is in contact with and tangent to each of the outer overhanging segments in sequence, the ring-shaped branch pipe is arranged along a circumferential direction of the ring winding, two ends of the ring-shaped branch pipe are in communication with the inner cooling ring pipe and the outer cooling ring pipe respectively, the inner cooling ring pipe and the outer cooling ring pipe are respectively provided with a liquid passage port, the two liquid passage ports extend from between two adjacent inner overhanging segments to a center of the stator core, and an inner diameter of the ring-shaped branch pipe is smaller than inner diameters of the inner cooling ring pipe and the outer cooling ring pipe; the inner cooling ring pipe comprises a first inner ring pipe segment, the stator core is provided with a first annular groove corresponding to the first inner ring pipe segment on an inner ring face of the stator core, and the first inner ring pipe segment is clamped in the first annular groove; the outer cooling ring pipe comprises a first outer ring pipe segment, the stator core is provided with a second annular groove corresponding to the first outer ring pipe segment on an outer ring face of the stator core, and the first outer ring pipe segment is clamped in the second annular groove; the ring-shaped branch pipe comprises a first branch ring pipe segment, the first branch ring pipe segment is in contact with an inner circumferential face of the ring winding, the stator core is provided with a branch pipe annular groove corresponding to each of the first branch ring pipe segments, and the first branch ring pipe segment is clamped in the branch pipe annular groove; and the first annular groove, the second annular groove, and the branch pipe annular groove are all located in an area surrounded by the plurality of ring windings; the cooling mechanism for the stator of the ring-winding axial flux motor comprises an inner clamping ring and an outer clamping ring, the inner circumferential face of the inner clamping ring is provided with a tooth slot corresponding to each of the inner overhanging segments, the inner cooling ring pipe comprises a second inner ring pipe segment, the outer circumferential face of the inner clamping ring is provided with a third annular groove corresponding to the second inner ring pipe segment, and the second inner ring pipe segment is clamped in the third annular groove; the inner circumferential face of the outer clamping ring is provided with a tooth slot corresponding to each of the outer overhanging segments, the outer cooling ring pipe comprises a second outer ring pipe segment, the inner circumferential face of the outer clamping ring is provided with a fourth annular groove corresponding to the second outer ring pipe segment, and the second outer ring pipe segment is clamped in the fourth annular groove; and the ring-shaped branch pipe comprises a second branch ring pipe segment, and the second branch ring pipe segment is in contact with an outer circumferential face of the ring winding. ​ ​ ​ The annular branch pipe can be additionally provided with a certain number of auxiliary annular pipes, both ends of the auxiliary annular pipes are communicated with the inner cooling annular pipe and the outer cooling annular pipe respectively, the auxiliary annular pipes are embedded in parallel in the annular branch pipe position, each of the auxiliary annular pipes avoids the respective annular winding and is laid on the outer contour surface of the stator core between two annular windings, the auxiliary annular pipe comprises a first auxiliary annular pipe segment and a second auxiliary annular pipe segment, the stator core outer contour surface is provided with an auxiliary branch pipe annular groove corresponding to each of the auxiliary annular pipe segments; both ends of the first auxiliary annular pipe segment are connected with a first inner annular pipe segment and a first outer annular pipe segment respectively, the first auxiliary annular pipe segment is clamped in the auxiliary branch pipe annular groove; both ends of the second auxiliary annular pipe segment are connected with a second inner annular pipe segment and a second outer annular pipe segment respectively, an axial pipe hole is formed in the middle of the adjacent tooth slots of the end surface of the inner clamping ring and the outer clamping ring respectively, both ends of the second auxiliary annular pipe segment are clamped in the auxiliary branch pipe annular groove through the axial pipe hole.

2. An axial flux motor stator cooling arrangement for a ring winding according to claim 1, characterized in that: The inner clamping ring is mounted on the inner side of the stator core by screws, and the outer clamping ring is mounted on the outer side of the stator core by screws.

3. An axial flux motor stator cooling arrangement for a ring winding motor according to claim 1, characterized in that: The first inner annular pipe segment and the second inner annular pipe segment share a liquid passage port, and the first outer annular pipe segment and the second outer annular pipe segment share another liquid passage port.

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