Axial field motor and its stator cooling structure and manufacturing method

Abstract

The application provides an axial magnetic field motor stator, a cooling structure and a manufacturing method thereof. The cooling structure comprises a stator shell, the stator shell comprises an upper metal plate, an intermediate partition plate and a lower metal plate which are spliced along an axial direction, a plurality of core mounting holes are arranged on the stator shell in a circumferential direction, each core mounting hole penetrates the upper metal plate, the intermediate partition plate and the lower metal plate in sequence, a yokeless core is mounted in the core mounting hole and exposes two ends on both sides of the stator shell, a coil is sleeved on the yokeless core, the coil is sleeved on both ends of the yokeless core which are exposed on both sides of the stator shell, an upper flow channel is arranged on a splicing surface of the upper metal plate and the intermediate partition plate, a lower flow channel is arranged on a splicing surface of the lower metal plate and the intermediate partition plate, and an intermediate hole is arranged on the intermediate partition plate and communicates the upper flow channel and the lower flow channel. The method does not occupy the circumferential space of the coil, improves the coil slot fill rate, simultaneously reduces the forming difficulty and realizes the manufacturability.

Description

Technical Field

[0001] This invention relates to the field of stator cooling, and more particularly to an axial magnetic field motor without a yoke core and its stator cooling structure and manufacturing method. Background Technology

[0002] Axial field motors, also known as disc motors, are widely used in electric vehicles, general industrial applications, and other fields due to their advantages such as small size, high torque density, high power density, and high efficiency. The motor consists of a housing, a stator, and a rotor, with the stator and rotor housed inside the housing. During operation, heat is generated inside the stator, which needs to be dissipated for safety and to maintain motor efficiency.

[0003] Currently, heat is dissipated by cooling fluid passing through the stator. However, due to space and insulation limitations, some non-insulated cooling fluids can only pass through the stator via pre-designed cooling paths. For example, CN216056503U discloses a disc motor stator for easy heat dissipation, which utilizes cooling paths arranged between the core windings and on the radial inner and outer sides of the core windings. The cooling paths include inner circulation channels, outer circulation channels, and water-cooling channels. The cooling fluid flows back and forth between the inner and outer circulation channels sequentially through each water-cooling channel. Although this achieves a cooling effect, it has the following drawbacks:

[0004] First, the heat generated by the iron core needs to be transferred to the cooling fluid through the coil, meaning the iron core is far from the cooling path, resulting in poor heat dissipation inside the iron core.

[0005] Second, the cooling path occupies the circumferential space of the coil, reducing the occupancy rate of the winding in the slot.

[0006] Third, each coil is separated by a water-cooling channel, which is not conducive to connecting the coils to form a winding.

[0007] Fourth, the cooling path includes an inner circulation channel, an outer circulation channel, and a water cooling channel, indicating that the cooling path is complex and the casting is quite difficult. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides an axial magnetic field motor and its stator cooling structure and manufacturing method that directly wraps around the iron core without occupying the coil circumferential space, thereby increasing the coil slot fill factor. Simultaneously, it reduces molding difficulty and achieves manufacturability. According to one objective of this invention, a stator cooling structure for an axial magnetic field motor is provided, comprising:

[0009] A stator housing includes an upper metal plate, a middle partition plate, and a lower metal plate spliced ​​along the axial direction. The stator housing is provided with a plurality of circumferentially spaced iron core mounting holes, each of which sequentially passes through the upper metal plate, the middle partition plate, and the lower metal plate.

[0010] Several unyoke iron cores are installed in the iron core mounting holes with both ends exposed on both sides of the stator housing;

[0011] Several coils are provided, the coils are sleeved on the yokeless iron core, and the yokeless iron core is sleeved on both ends exposed on both sides of the stator housing;

[0012] An upper flow channel is provided on the surface where the upper metal plate and the middle partition are spliced ​​together, and a lower flow channel is provided on the surface where the lower metal plate and the middle partition are spliced ​​together. An intermediate hole is provided on the middle partition to connect the upper flow channel and the lower flow channel.

[0013] The upper flow channel includes an upper main flow channel, a first upper branch flow channel and a second upper branch flow channel. The upper main flow channel is connected to the first upper branch flow channel, and the second upper branch flow channel is set independently. The first upper branch flow channel and the second upper branch flow channel are arranged around the unyoke iron core and form a flow channel gap on the inner side of the unyoke iron core.

[0014] The lower flow channel includes a lower main flow channel, a first lower branch flow channel and a second lower branch flow channel. The lower main flow channel is connected to the first lower branch flow channel, and the second lower branch flow channel is set independently. The first lower branch flow channel and the second lower branch flow channel are arranged around the unyoke iron core and form a flow channel gap inside the unyoke iron core.

[0015] The intermediate partition is provided with a central hole, which is arranged on both sides of the flow channel notch. The first upper flow channel and the second lower flow channel are connected through the central hole. The second upper flow channel and the first lower flow channel are connected through the central hole. The second upper flow channel and the second lower flow channel are connected through the central hole.

[0016] In a preferred embodiment, the second upper distribution channel includes a plurality of independent channels, and the first upper distribution channel includes a plurality of independent channels.

[0017] In a preferred embodiment, the first upper branch channel, the second lower branch channel, the second upper branch channel, and the first lower branch channel are connected in sequence.

[0018] In a preferred embodiment, a flow interruption slit is provided on the flow channel notch.

[0019] In a preferred embodiment, the first upper branch channel, the second lower branch channel, the second upper branch channel, and the first lower branch channel, which are connected in sequence, are partially staggered and extended in the circumferential direction.

[0020] In a preferred embodiment, the first upper branch channel includes a first water inlet branch, a first iron core outer ring upper branch, and a first iron core inter-upper branch. The first water inlet branch connects the upper main channel and the first iron core outer ring upper branch. The first iron core outer ring upper branch connects two first iron core inter-upper branches. The first iron core inter-upper branch is disposed between two adjacent unyoke iron cores.

[0021] The second upper branch channel includes an upper branch on the outer ring of the second iron core and an upper branch between the second iron cores. The upper branch on the outer ring of the second iron core connects to three upper branches between the second iron cores. The upper branches between the second iron cores are located between two adjacent unyoke iron cores.

[0022] The first lower branch channel includes a first water outlet branch, a first iron core outer ring lower branch, and a first iron core inter-branch lower branch. The first water outlet branch connects the lower main channel and the first iron core outer ring lower branch. The first water outlet branch is connected to the center of the first iron core outer ring lower branch. The first iron core outer ring lower branch connects to four first iron core inter-branch lower branches. The first iron core inter-branch lower branches are located between two adjacent unyoke iron cores.

[0023] The second lower branch channel includes a second outer ring lower branch and a second inter-core lower branch. The second outer ring lower branch connects two second inter-core lower branches, and the second inter-core lower branches are located between two adjacent unyoke cores.

[0024] In a preferred embodiment, there are two first inlet branches and two first outlet branches, and the center line connecting the two first inlet branches is perpendicular to the center line connecting the two first outlet branches.

[0025] In a preferred embodiment, the upper main channel includes an inlet and an inlet loop, the inlet loop surrounds the outside of the yokeless iron core, the inlet connects the inlet loop and the outer wall of the upper metal plate, and the first upper branch channel is connected to the inlet loop;

[0026] The lower main channel includes an outlet and an outlet loop. The outlet loop surrounds the outside of the yokeless iron core. The outlet connects the outlet loop and the outer wall of the lower metal plate. The first lower branch channel is connected to the outlet loop.

[0027] According to another objective of the present invention, the present invention also provides an axial magnetic field motor, the axial magnetic field motor including the stator cooling structure of the axial magnetic field motor of the above embodiment, the axial magnetic field motor further including two rotors, the two rotors being air-gaply held on both sides of the yokeless iron core.

[0028] According to another objective of the present invention, the present invention also provides a method for manufacturing a stator cooling structure for an axial magnetic field motor, comprising the following steps:

[0029] a. A stator housing is provided, wherein the stator housing is provided with a plurality of circumferentially spaced iron core mounting holes, the stator housing includes an upper metal plate, a middle partition plate and a lower metal plate, the iron core mounting holes sequentially penetrate the upper metal plate, the middle partition plate and the lower metal plate, the upper metal plate has an upper splicing part and an upper flow channel is provided on the upper splicing part, the lower metal plate has a lower splicing part and a lower flow channel is provided on the lower splicing part, and the middle partition plate is provided with a plurality of intermediate holes;

[0030] b. The middle partition is spliced ​​between the upper splicing part and the lower splicing part so that the middle hole connects the upper flow channel and the lower flow channel;

[0031] c. Insert a yokeless iron core into the iron core mounting hole;

[0032] d. Wrap coils on both sides of the axial direction of the yokeless iron core, and keep the coils on both sides of the axial direction of the stator housing.

[0033] Compared with existing technologies, this technical solution has the following advantages:

[0034] The stator housing is located in the middle section of the yokeless iron core, while the two coils sleeved on the yokeless iron core are located on both sides of the axial direction of the stator housing. This allows the upper flow channel and the lower flow channel located in the stator housing to simultaneously contact and exchange heat with the yokeless iron core and the coils, effectively improving the cooling effect.

[0035] Since the two coils fitted on the unyoke core are located on opposite sides of the stator housing, the coils on the same side can be connected to form a winding. Compared with the traditional arrangement of coils between the core and the stator cooling structure, this avoids the problem of increased circumferential space design and low occupancy rate of the winding in the slot.

[0036] The stator housing has a split structure to facilitate the machining of the upper and lower flow channels. The upper metal plate, the intermediate partition plate, and the lower metal plate are then assembled, achieving manufacturability and reducing casting difficulty. Furthermore, by providing the intermediate hole in the intermediate partition plate, the cooling medium can circulate between the upper and lower flow channels. The upper and lower flow channels are arranged axially along the unyoke core, increasing the heat exchange area, improving fluidity, and thus enhancing cooling performance.

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the stator cooling structure of the axial magnetic field motor described in this invention;

[0039] Figure 2 This is a front view of the stator housing described in this invention;

[0040] Figure 3 for Figure 2 Sectional view along the AA direction;

[0041] Figure 4 This is a schematic diagram of the structure of the intermediate partition plate described in this invention;

[0042] Figure 5 This is a schematic diagram of the structure of the first embodiment of the upper metal plate described in this invention;

[0043] Figure 6 This is a schematic diagram of the structure of the first embodiment of the lower metal plate described in this invention;

[0044] Figure 7 This is a schematic diagram of a first embodiment of the combination of the upper flow channel and the lower flow channel according to the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the second embodiment of the upper metal plate described in this invention;

[0046] Figure 9 This is a schematic diagram of the structure of the second embodiment of the lower metal plate described in this invention;

[0047] Figure 10 This is a schematic diagram of a second embodiment of the combination of the upper flow channel and the lower flow channel described in this invention;

[0048] Figure 11 This is a schematic diagram of the structure of the upper metal plate in the third embodiment of the present invention;

[0049] Figure 12 This is a schematic diagram of the structure of the lower metal plate of the present invention in the third embodiment;

[0050] Figure 13 This is a schematic diagram of a third embodiment of the combination of the upper flow channel and the lower flow channel of the present invention;

[0051] Figure 14 This is a schematic diagram of the third embodiment of the combination of the upper flow channel and the lower flow channel according to the present invention;

[0052] Figure 15 This is an exploded view of the axial magnetic field motor described in this invention;

[0053] Figure 16 This is a cross-sectional view along the gap between the iron core mounting holes in the axial magnetic field motor described in this invention;

[0054] Figure 17 This is a cross-sectional view along the center of the iron core mounting hole in the axial magnetic field motor of the present invention;

[0055] Figure 18 This is a schematic diagram of another embodiment of the stator housing described in this invention;

[0056] Figure 19 This is a schematic diagram of the eddy current path in the stator described in this invention. Detailed Implementation

[0057] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0058] First Embodiment

[0059] like Figures 1 to 3 As shown, the axial magnetic field motor stator cooling structure includes:

[0060] A stator housing 110 is provided, the stator housing 110 includes an upper metal plate 111, an intermediate partition plate 112 and a lower metal plate 113 spliced ​​along the axial direction, and the stator housing 110 is provided with a plurality of circumferentially spaced iron core mounting holes 110a, each of the iron core mounting holes passing through the upper metal plate 111, the intermediate partition plate 112 and the lower metal plate 113 in sequence;

[0061] Several yokeless iron cores 120 are installed in the iron core mounting holes 110a and have their two ends exposed on both sides of the stator housing 110.

[0062] A plurality of coils 130 are sleeved on the yokeless iron core 120, and coils 130 are sleeved on both ends of the yokeless iron core 120 exposed on both sides of the stator housing 110.

[0063] An upper flow channel 111a is provided on the surface where the upper metal plate 111 is spliced ​​with the middle partition 112, and a lower flow channel 113a is provided on the surface where the lower metal plate 113 is spliced ​​with the middle partition 112. The middle partition 112 is provided with an intermediate hole 112a that connects the upper flow channel 111a and the lower flow channel 113a.

[0064] When the yokeless core 120 is inserted into the core mounting hole 110a, the stator housing 110 is held in the middle section of the yokeless core 120, while the two coils 130 sleeved on the yokeless core 120 are held on both axial sides of the stator housing 110. This allows the upper flow channel 111a and the lower flow channel 113a located in the stator housing 110 to simultaneously contact and exchange heat with the yokeless core 120 and the coils 130, effectively improving the cooling effect. Furthermore, since the two coils 130 sleeved on the yokeless core 120 are held on both axial sides of the stator housing 110, coils 130 on the same side can be connected to form a winding. Compared to the traditional arrangement of coils between the core and the stator cooling structure, this avoids the problem of increased circumferential space and low occupancy rate of the windings in the slots. Furthermore, the stator housing 110 has a split structure to facilitate the machining of the upper flow channel 111a and the lower flow channel 113a. The upper metal plate 111, the intermediate partition plate 112, and the lower metal plate 113 can then be assembled, achieving manufacturability and reducing casting difficulty. Moreover, by providing the intermediate hole 112a on the intermediate partition plate 112, the cooling medium can circulate between the upper flow channel 111a and the lower flow channel 113a. The upper flow channel 111a and the lower flow channel 113a are arranged axially along the yokeless core 120, increasing the heat exchange area, improving fluidity, and thus enhancing cooling performance.

[0065] like Figures 2 to 6 , Figure 8 , Figure 9 , Figure 11 , Figure 12 and Figure 15 As shown, the upper metal plate 111 has an upper splicing portion 1112 and an upper receiving portion 1111, and a plurality of upper iron core mounting portions 1113 penetrating the upper splicing portion 1112 and the upper receiving portion 1111. The lower metal plate 113 has an upper splicing portion 1132 and a lower receiving portion 1131, and a plurality of lower iron core mounting portions 1133 penetrating the lower splicing portion 1132 and the lower receiving portion 1131. The middle partition plate 112 is provided with a plurality of iron core mounting portions 1123 and a plurality of intermediate holes 112a, and the iron core mounting portions 1123 and the intermediate holes 112a are spaced apart. After the intermediate partition 112 is spliced ​​between the upper splicing part 1112 and the lower splicing part 1132, the upper mounting part 1113, the middle mounting part 1123, and the lower mounting part 1133 of the iron core correspondingly form iron core mounting holes 110a, and the intermediate hole 112a communicates with the upper flow channel 111a and the lower flow channel 113a.

[0066] Specifically, the upper metal plate 111, the intermediate partition plate 112, and the lower metal plate 113 are generally sheet-like, assembled to form the disc-shaped stator housing 110. That is, the axial dimension of the stator housing 110 is small, reflecting the characteristic of a small axial dimension in an axial field motor. The intermediate partition plate 112 is the thinnest and can be made of metal or non-metal. The outer contour of the stator housing 110 can be circular or square, etc., and a through hole is formed in the center of the stator housing 110 for mounting the rotating shaft 300 and the bearing 400. (Refer to...) Figure 15 Furthermore, the upper mounting portion 1113, the middle mounting portion 1123, and the lower mounting portion 1133 of the iron core have the same shape, all being trapezoidal, and correspondingly forming trapezoidal iron core mounting holes 110a to accommodate the installation of the trapezoidal unyoke iron core 120. (Refer to...) Figure 2 and Figure 15 The trapezoidal upper base of the iron core mounting hole 110a faces inward, and the trapezoidal lower base of the iron core mounting hole 110a faces outward.

[0067] More specifically, the upper metal plate 111 is provided with an upper flow channel opening groove 111a0, and the middle partition plate 112 covers the upper flow channel opening groove 111a0 to form the upper flow channel 111a. The lower metal plate 113 is provided with a lower flow channel opening groove 113a0, and the middle partition plate 112 covers the lower flow channel opening groove 113a0 to form the lower flow channel 113a.

[0068] The upper flow channel opening groove 111a0 is machined on the upper splicing portion 1112 exposed on the upper metal plate 111, and the lower flow channel opening groove 113a0 is machined on the lower splicing portion 1132 exposed on the lower metal plate 113. Then, the intermediate partition 112 is spliced ​​between the upper metal plate 111 and the lower metal plate 113 to form the upper flow channel 111a and the lower flow channel 113a. The intermediate hole 112a connects to and communicates with the upper flow channel opening groove 111a0 and the lower flow channel opening groove 113a0, respectively. Furthermore, the upper metal plate 111, the middle partition plate 112, and the lower metal plate 113 can also be formed by stamping, which reduces the casting difficulty and facilitates the cleaning of the exposed upper flow channel opening groove 111a0 and lower flow channel opening groove 113a0. In contrast to the traditional built-in water channel method, after the water channel is formed, its inner wall is rough and cannot be cleaned, which easily leads to blockage and other problems.

[0069] refer to Figure 3The intermediate partition 112 is sealed to both the upper metal plate 111 and the lower metal plate 113. This sealing connection includes the use of sealant, sealing rings, or welding. Taking the upper metal plate 111 and the intermediate partition 112 as an example, sealant is provided between the upper joint 1112 of the intermediate partition 112 and the upper metal plate 111 to ensure a tight seal and prevent leakage of cooling media (including cooling water, cooling oil, or cooling gas).

[0070] The intermediate partition 112 is a flexible material plate, such as a rubber plate, and the upper metal plate 111 and the lower metal plate 113 are thermally conductive metal plates, which enhance their support and heat exchange capabilities.

[0071] refer to Figure 1 The upper metal plate 111, the middle partition plate 112, and the lower metal plate 113 are arranged along the axial direction of the yokeless iron core 120. The upper accommodating portion 1111 is used to arrange the coil 130. The upper flow channel 111a provided on the upper splicing portion 1112 can cool the coil 130 in the upper accommodating portion 1111. Similarly, the lower flow channel 113a provided on the lower splicing portion 1132 cools the coil 130 in the lower accommodating portion 1131. The upper flow channel 111a and the lower flow channel 113a can simultaneously cool the yokeless iron core 120, making reasonable use of space and effectively ensuring the cooling capacity of the coil 130 and the yokeless iron core 120.

[0072] It should be noted that the upper flow channel 111a and the lower flow channel 113a are separated by the middle partition plate 112 and connected only through the middle hole 112a, which allows the cooling medium to pass fully through the upper flow channel 111a and the lower flow channel 113a, thereby improving the cooling effect.

[0073] like Figure 1 and Figure 15 As shown, the axial magnetic field motor stator cooling structure 100 further includes:

[0074] A plurality of slot wedges 140 are provided on both sides of the axial direction of the yokeless iron core 120. Each slot wedge 140 is inserted between two adjacent yokeless iron cores 120. The coil 130 abuts between the slot wedge 140 and the stator housing 110.

[0075] Specifically, the two circumferential sides of the yokeless iron core 120 are respectively disposed in the iron core slot 121, and the slot wedge 140 is respectively inserted into the iron core slot 121 of two adjacent yokeless iron cores 120 in the radial direction, so as to fix the coil 130 between the slot wedge 140 and the stator housing 110.

[0076] refer to Figure 1 and Figure 3 Both the upper receiving portion 1111 and the lower receiving portion 1131 are recessed slots, allowing the coil 130 to be embedded within them, with the coil 130 abutting against the bottom of the recess and the slot wedge 140. The yokeless core 120 and the slot wedge 140 are approximately flush with the axial side of the stator housing 110, while a gap exists between the coil 130 and the sidewall of the recess, which can be used to fill with potting compound. In other words, the upper receiving portion 1111 and the lower receiving portion 1131 are filled with potting compound to secure the stator housing 110, the coil 130, and the yokeless core 120.

[0077] Furthermore, the wiring portion 131 of the coil 130 is located radially outward, and the wiring portion 131 is located within the gap between the coil 130 and the side wall of the slot, allowing wiring between coils 130 on the same side to be performed within this gap. Specifically, coils 130 can be fitted onto each of the yokeless iron cores 120 one by one, and then wiring between the coils 130 is performed between the coils 130 and the side wall of the slot, which facilitates the connection of the coils 130 to form a winding. Of course, coils 130 on the same side can first be connected to form a whole through the wiring portion 131, and then wired together onto the yokeless iron core 120.

[0078] like Figure 1 As shown, an insulating and heat-conducting component is provided between the yokeless iron core 120 and the coil 130. This component can be a ceramic sheet or insulating paper, ensuring insulation and heat conduction between the two and preventing eddy current losses that could affect motor performance. Specifically, insulating paper can be wrapped around the outer periphery of the yokeless iron core 120, and then the coil 130 can be placed over the insulating paper to achieve insulation between the yokeless iron core 120 and the coil 130. It should be noted that the axial end faces of the yokeless iron core 120 are air gap surfaces, and the insulating paper should avoid obstructing these surfaces.

[0079] Furthermore, an insulating and heat-conducting component may also be provided between the coil 130 and the stator housing 110. The insulating and heat-conducting component is provided between the coil 130 and the bottom of the slot to achieve insulation between the coil 130 and the stator housing 110.

[0080] Second Embodiment

[0081] The stator cooling structure of the axial magnetic field motor in the second embodiment differs from that in the first embodiment in that, referring to... Figures 4 to 6The upper flow channel 111a includes an upper main flow channel 111a1 and an upper branch flow channel 111a2. The upper main flow channel 111a1 is arranged such that one end is connected to the upper branch flow channel 111a2 and the other end is connected to an external waterway. The upper branch flow channel 111a2 is arranged around the yokeless iron core 120 and forms a flow channel gap 1110a inside the yokeless iron core 120.

[0082] The lower flow channel 113a includes a lower main flow channel 113a1 and a lower branch flow channel 113a2. The lower main flow channel 113a1 is arranged such that one end is connected to the lower branch flow channel 113a2 and the other end is connected to an external waterway. The lower branch flow channel 113a2 is arranged around the yokeless iron core 120 and forms a flow channel gap 1110a inside the yokeless iron core 120.

[0083] The intermediate hole 112a connects the upper branch channel 111a2 and the lower branch channel 113a2 on the side of the flow channel notch 1110a.

[0084] There are multiple upper distribution channels 111a2 and multiple lower distribution channels 113a2. The upper main channel 111a1 connects to an external water channel and introduces externally introduced cooling medium into multiple upper distribution channels 1111a. Then, each upper distribution channel 1111a introduces cooling medium into the lower distribution channel 113a2 through the intermediate hole 112a. Subsequently, the cooling medium flows into the lower main channel 113a1 and is finally discharged through the external water channel connected to the lower main channel 113a1. The upper distribution channels 111a and lower distribution channels 113a are arranged axially spaced along the yokeless iron core 120, and the upper distribution channels 111a2 and lower distribution channels 113a2 are arranged around the yokeless iron core 120 to increase the heat exchange area and ensure that the cooling medium passes evenly through the upper distribution channels 111a and lower distribution channels 113a, thereby improving the cooling effect.

[0085] like Figure 4 and Figure 6 As shown, the upper branch channel 111a2 is connected to the lower branch channel 113a2 at both ends of the channel notch 1110a through two intermediate holes 112a respectively. The upper main channel 111a1 and the upper branch channel 111a2 are connected at the outside of the yokeless iron core 120. The lower main channel 113a1 and the lower branch channel 113a2 are connected at the outside of the yokeless iron core 120.

[0086] The upper main flow channel 111a1 is located radially outside the yokeless iron core 120, and the lower main flow channel 113a1 is also located radially outside the yokeless iron core 120. The upper branch flow channel 111a2 and the lower branch flow channel 113a2 are spaced apart and arranged around the yokeless iron core 120. In addition, since the flow channel notch 1110a is located radially inside the yokeless iron core 120, the heat exchange area between the upper branch flow channel 111a2 and the lower branch flow channel 113a2 and the yokeless iron core 120 is increased, thereby improving the cooling performance.

[0087] like Figure 5 and Figure 6 As shown, the upper main channel 111a1 includes an inlet 111a11 and an inlet loop 111a12. The inlet loop 111a12 surrounds the outside of the yokeless iron core 120. The inlet 111a11 connects the inlet loop 111a12 and the outer wall of the upper metal plate 111. The upper branch channel 111a2 connects to the inlet loop 111a12.

[0088] The lower main channel 113a1 includes an outlet 113a11 and an outlet loop 113a12. The outlet loop 113a12 surrounds the outside of the yokeless iron core 120. The outlet 113a11 connects the outlet loop 113a12 and the outer wall of the lower metal plate 113. The lower branch channel 113a2 connects to the outlet loop 113a12.

[0089] The inlet 111a11 and the outlet 113a11 are used to connect to external waterways, including connecting external water pipes. The inlet 111a11 is used to introduce cooling medium, and the outlet 113a11 is used to discharge cooling medium. Preferably, when the intermediate partition 112 is spliced ​​between the upper metal plate 111 and the lower metal plate 113, the inlet 111a1 and the outlet 113a1 are arranged facing each other, which facilitates centralized external piping and management. The inlet loop 111a12 and the outlet loop 113a12 are loops connected end to end in sequence.

[0090] Continue to refer to Figure 5 and Figure 6The upper branch channel 111a2 includes an inlet branch 111a21, an outer ring upper branch 111a22, and an inter-core upper branch 111a23. The inlet branch 111a21 is connected between the inlet loop 111a12 and the outer ring upper branch 111a22. The two ends of the outer ring upper branch 111a22 are respectively connected to the inter-core upper branch 111a23. The inter-core upper branch 111a23 is disposed between two adjacent unyoke iron cores 120, and the flow channel gap 1110a is formed between the two inter-core upper branches 111a23 on the inner side of the unyoke iron core 120.

[0091] The lower branch channel 113a2 includes an outlet branch 113a21, an outer ring lower branch 113a22, and an inter-core lower branch 113a23. The outlet branch 113a21 is connected between the outlet loop 113a12 and the outer ring lower branch 113a22. The two ends of the outer ring lower branch 113a22 are respectively connected to the inter-core lower branch 113a23. The inter-core lower branch 113a23 is arranged between two adjacent unyoke iron cores 120, and the flow channel gap 1110a is formed between the two inter-core lower branches 113a23 on the inner side of the unyoke iron core 120.

[0092] The number of the upper flow channel 111a2 and the lower flow channel 113a2 is multiple. When the middle partition plate 112 is spliced ​​between the upper metal plate 111 and the lower metal plate 113, the upper flow channel 111a2 and the lower flow channel 113a2 are spaced apart to ensure that each of the yokeless iron cores 120 can be arranged around the flow channel and that the cooling medium passes through evenly.

[0093] like Figure 5 As shown, the flow channel gap 1110a is formed inside the yokeless core 120 and between the upper branches 111a23 of two adjacent cores. Figure 6 The flow channel gap 1110a is formed inside the yokeless iron core 120 and between the lower branches 113a23 of two adjacent iron cores.

[0094] like Figures 4 to 7As shown, the cooling medium is introduced through the inlet 111a11, then flows along the inlet loop 111a12 and through several inlet branches 111a21 into the connected upper branch 111a22 of the outer ring of the iron core. The cooling medium in the upper branch 111a22 of the outer ring of the iron core then flows into the upper branch 111a23 between the two iron cores connected thereto, and then flows through the intermediate hole 112a into the corresponding lower branch 113a23 between the iron cores. The cooling medium in the lower branch 113a23 between the iron cores then flows through the lower branch 113a22 of the outer ring of the iron core until it flows into the outlet loop 113a21, and finally is collected and discharged from the outlet 113a11. The reasonable design of the cooling flow path not only increases the heat exchange area and improves the fluidity of the cooling medium, but also avoids the limitation of the cooling path design, which may cause some heat to be unable to be discharged in time or result in a large temperature gradient, thus causing adverse effects on the stator or preventing the motor from achieving satisfactory output capacity.

[0095] like Figure 18 As shown, a flow interruption slot 1110a1 is provided on the flow channel notch 1110a. The flow interruption slot 1110a1 penetrates the stator housing 110 axially and connects the core mounting hole 110a and the inner wall of the stator housing 110. Each core mounting hole 110a is connected to one flow interruption slot 1110a1. The flow interruption slot 1110a1 extends radially to block the stator eddy current path 1001 in which it is located. (Refer to...) Figure 19 To further explain, each of the iron cores 120 generates a stator eddy current path 1001, which is composed of multiple elliptical loop paths arranged from the inside out. The interruption slot 1110a1 refers to a slot arranged radially and penetrating the stator housing 110 axially. This slot blocks each elliptical loop path, thereby reducing eddy current losses. Additionally, a sealing ring can be added to the inner wall of the stator housing 110. The sealing ring can be made of metal, and an insulating component can be added between the stator housing 110 and the sealing ring to ensure structural strength and achieve insulation.

[0096] Third Embodiment

[0097] The stator cooling structure of the axial magnetic field motor in the third embodiment differs from that in the second embodiment in that, referring to... Figures 8 to 10 The upper flow channel 111a includes a plurality of radially extending upper branch water channels 111a3. The upper branch water channels 111a3 are arranged between adjacent yokeless iron cores 120 and have an upper port 111a31 inside the yokeless iron core 120. Two adjacent upper branch water channels 111a3 are separated from each other inside the yokeless iron core 120 to form a blocking space 1110b.

[0098] The downstream channel 113a includes a plurality of radially extending downstream branch channels 113a3. The downstream branch channels 113a3 are arranged between adjacent yokeless iron cores 120 and have a downstream port 113a31 inside the yokeless iron core 120. Two adjacent downstream branch channels 113a3 are separated from each other inside the yokeless iron core 120 to form a barrier space 1110b.

[0099] The intermediate partition plate 112 is provided with an intermediate hole 112a, which connects the upper port 111a31 of the upper branch water passage 111a3 and the lower port 113a31 of the lower branch water passage 113a3 inside the yokeless iron core 120.

[0100] After the intermediate partition 112 is spliced ​​between the upper metal plate 111 and the lower metal plate 113, the upper branch water passage 111a3 and the lower branch water passage 113a3 correspond one-to-one. By setting the barrier space 1110b, the corresponding upper branch water passage 111a3 and lower branch water passage 113a3 are connected through the intermediate hole 112a. The upper port 111a31 and the lower port 113a31 are both located radially inside the yokeless iron core 120 to ensure heat exchange area and improve cooling performance.

[0101] refer to Figure 8 and Figure 9 The upper flow channel 111a further includes an inlet 111a11 and an inlet loop 111a12. The inlet loop 111a12 surrounds the outside of the yokeless iron core 120. The inlet 111a11 connects the inlet loop 111a12 and the outer wall of the upper metal plate 111. The upper branch water channel 111a3 connects to the inlet loop 111a12.

[0102] The downstream channel 113a also includes an outlet 113a11 and an outlet loop 113a12. The outlet loop 113a12 surrounds the outside of the yokeless iron core 120. The outlet 113a11 connects the outlet loop 113a12 and the outer wall of the lower metal plate 113. The lower branch water channel 113a3 connects to the outlet loop 113a12.

[0103] like Figures 8 to 10As shown, the cooling medium is introduced through the inlet 111a11, then flows along the inlet loop 111a12, and through several upper branches 111a3 between the iron cores. The cooling medium in the upper branches 111a3 between the iron cores flows into the lower branch 113a3 between the iron cores through the intermediate hole 112a, and then flows into the outlet loop 113a12. Finally, it is collected and discharged from the outlet 113a11. The reasonable design of the cooling flow path not only increases the heat exchange area and improves the fluidity of the cooling medium, but also avoids the limitation of the cooling path design, which may cause some heat to be unable to be discharged in time or result in a large temperature gradient, thereby causing adverse effects on the stator or preventing the motor from achieving satisfactory output capacity.

[0104] To reduce eddy current losses, a flow interruption slot 1110a1 can also be provided on the obstruction space 1110b. For details, please refer to the flow interruption slot 1110a1 in the second embodiment, which will not be described in detail here.

[0105] Fourth embodiment

[0106] The difference between the axial magnetic field motor stator cooling structure of the fourth embodiment and that of the second embodiment is that, referring to... Figures 11 to 14 The upper flow channel 111a includes an upper main flow channel 111a1, a first upper branch flow channel 111a4, and a second upper branch flow channel 111a5. The upper main flow channel 111a1 is connected to the first upper branch flow channel 111a4, and the second upper branch flow channel 111a5 is independently arranged. The first upper branch flow channel 111a4 and the second upper branch flow channel 111a5 are arranged around the yokeless iron core 120 and form a flow channel notch 1110a inside the yokeless iron core 120.

[0107] The lower flow channel 113a includes a lower main flow channel 113a1, a first lower branch flow channel 113a4, and a second lower branch flow channel 113a5. The lower main flow channel 113a1 is connected to the first lower branch flow channel 113a4, and the second lower branch flow channel 113a5 is independently arranged. The first lower branch flow channel 113a4 and the second lower branch flow channel 113a5 are arranged around the yokeless iron core 120 and form a flow channel notch 1110a inside the yokeless iron core 120.

[0108] The intermediate partition plate 112 is provided with an intermediate hole 112a, which is arranged on both sides of the flow channel notch 1110a. The first upper flow channel 111a4 and the second lower flow channel 113a5 are connected through the intermediate hole 112a. The second upper flow channel 111a5 and the first lower flow channel 113a4 are connected through the intermediate hole 112a. The second upper flow channel 111a5 and the second lower flow channel 113a5 are connected through the intermediate hole 112a.

[0109] The upper main channel 111a1 is used to guide the cooling medium to the first upper branch channel 111a4 connected to it. Then, the first upper branch channel 111a4 guides the cooling medium to the second lower branch channel 113a5 through the intermediate hole 112a. The second lower branch channel 113a5 guides the cooling medium to the second upper branch channel 111a5 through the intermediate hole 112a. The second upper branch channel 111a5 guides the cooling medium to the first lower branch channel 113a4 through the intermediate hole 112a. Finally, the cooling medium is discharged through the lower main channel 113a1.

[0110] As can be seen, the first upper distribution channel 111a4, the second lower distribution channel 113a5, the second upper distribution channel 111a5, and the first lower distribution channel 113a4 are sequentially connected. Furthermore, after the intermediate partition 112 is spliced ​​between the upper metal plate 111 and the lower metal plate 113, the sequentially connected first upper distribution channel 111a4, second lower distribution channel 113a5, second upper distribution channel 111a5, and first lower distribution channel 113a4 are partially staggered and extended in the circumferential direction, ensuring that water channels are arranged around each of the yokeless iron cores 120 to guarantee the cooling effect.

[0111] refer to Figure 11 and Figure 12 The second upper branch channel 111a5 comprises multiple independent channels, and the first upper branch channel 111a4 comprises multiple independent channels. Similarly, the second lower branch channel 113a5 comprises multiple independent channels, and the first lower branch channel 113a4 comprises multiple independent channels.

[0112] Specifically, there are two first upper branch channels 111a4, which are respectively connected to the two ends of the upper main channel 111a1. There are four second lower branch channels 113a5, and each first upper branch channel 111a4 corresponds to two second lower branch channels 113a5, so that the two sides of the first upper branch channel 111a4 are connected to the second upper branch channel 111a5 through a second lower branch channel 113a5.

[0113] Continue to refer to Figure 11 and Figure 12 The first upper branch channel 111a4 includes a first water inlet branch 111a41, a first iron core outer ring upper branch 111a42, and a first iron core inter-upper branch 111a43. The first water inlet branch 111a41 connects the upper main channel 111a1 and the first iron core outer ring upper branch 111a42. The first iron core outer ring upper branch 111a42 connects two first iron core inter-upper branches 111a43. The first iron core inter-upper branch 111a43 is disposed between two adjacent yokeless iron cores 120.

[0114] The second upper branch channel 111a5 includes a second outer ring upper branch 111a52 and a second inter-core upper branch 111a53. The second outer ring upper branch 111a52 connects three second inter-core upper branches 111a53. The second inter-core upper branches 111a53 are disposed between two adjacent unyoke iron cores 120.

[0115] The first lower branch channel 113a4 includes a first water outlet branch 113a41, a first iron core outer ring lower branch 113a42, and a first iron core inter-branch lower branch 113a43. The first water outlet branch 113a41 connects the lower main channel 113a1 and the first iron core outer ring lower branch 113a42. The first water outlet branch 113a41 is connected to the center of the first iron core outer ring lower branch 113a42. The first iron core outer ring lower branch 113a42 connects four first iron core inter-branch lower branches 113a43. The first iron core inter-branch lower branches 113a43 are disposed between two adjacent yokeless iron cores 120.

[0116] The second lower branch channel 113a5 includes a second outer ring lower branch 113a52 and a second inter-core lower branch 113a53. The second outer ring lower branch 113a52 connects the two second inter-core lower branches 113a53. The second inter-core lower branch 113a53 is disposed between two adjacent unyoke cores 120.

[0117] The upper main channel 111a1 includes an inlet 111a11 and an inlet loop 111a12. The inlet loop 111a12 surrounds the outside of the yokeless iron core 120. The inlet 111a11 connects the inlet loop 111a12 and the outer wall of the upper metal plate 111. The first upper branch channel 111a4 is connected to the inlet loop 111a12.

[0118] The lower main channel 113a1 includes an outlet 113a11 and an outlet loop 113a12. The outlet loop 113a12 surrounds the outside of the yokeless iron core 120. The outlet 113a11 connects the outlet loop 113a12 and the outer wall of the lower metal plate 113. The first lower branch channel 113a4 is connected to the outlet loop 113a12.

[0119] The inlet loop 111a12 and the outlet loop 113a12 are semi-circular loops with an arc of approximately 90°. The inlet loop 111a12 and the outlet loop 113a12 are staggered circumferentially, with the outlet loop 113a12 offset from the inlet loop 111a12 by 90°, so that the line connecting the centers of the two first inlet branches 111a41 is perpendicular to the line connecting the centers of the two first outlet branches 113a41. This divides the cooling medium introduced by the first inlet branch 111a41 into two paths, each with a path angle of 90° on the stator housing 110, allowing the cooling medium to pass through evenly and improving the cooling effect.

[0120] like Figures 11 to 14 As shown, the cooling medium is introduced through the inlet 111a11, then flows along the inlet loop 111a12 and through the two first inlet branches 111a41 into the first upper branch channel 111a4 connected to it. Then, the first upper branch channel 111a4 leads the cooling medium to the second lower branch channel 113a5 through the intermediate hole 112a. The second lower branch channel 113a5 leads the cooling medium to the second upper branch channel 111a5 through the intermediate hole 112a. The second upper branch channel 111a5 leads the cooling medium to the first lower branch channel 113a4 through the intermediate hole 112a. Finally, the cooling medium is discharged through the lower main channel 113a1. The reasonable design of the cooling channel path not only increases the heat exchange area and improves the fluidity of the cooling medium, but also avoids the limitation of the cooling path design, which may cause some heat to be unable to be discharged in time or result in a large temperature gradient, thereby causing adverse effects on the stator or preventing the motor from achieving satisfactory output capacity.

[0121] Fifth embodiment

[0122] like Figures 15 to 17 As shown, the axial magnetic field motor includes an axial magnetic field motor stator cooling structure 100 according to any one of the first to fourth embodiments, and the axial magnetic field motor also includes two rotors 200, which are air-gaply held on both sides of the yokeless iron core 120.

[0123] Since the axial magnetic field motor adopts the axial magnetic field motor stator cooling structure 100 of the above embodiment, the beneficial effects of the axial magnetic field motor are as described in the axial magnetic field motor stator cooling structure 100 of the above embodiment.

[0124] Continue to refer to Figure 12 and Figure 17The axial magnetic field motor further includes a rotating shaft 300 and at least one bearing 400. The rotating shaft 300 passes through the center of the stator housing 110, and the bearing 400 is provided between the rotating shaft 300 and the stator housing 110. The rotor 200 is fixed on the rotating shaft 300, and the rotor 200 is air-gap maintained with the stator 100.

[0125] like Figure 15 As shown, the rotor 200 includes a rotor disk 210 and a plurality of magnets 220. The magnets 220 are arranged circumferentially on the rotor disk 210, and are air-gap connected to the yokeless iron core 120. When the magnets 220 are arranged on the rotor disk 210, they slightly protrude from the surface of the rotor disk 210 to engage with the iron core 130 in an air-gap manner.

[0126] The rotor 200 also includes several pressure plates 230. A pressure plate 230 is provided between two adjacent magnets 220. The pressure plate 230 is fixed to the magnet receiving groove by fasteners and adapts to the circumferential side of the magnet 220 by means of inclined surface to perform axial and circumferential positioning of the magnet 220.

[0127] The magnet 220 is formed by stacking several silicon steel sheets radially, and a flow-blocking surface is formed between two adjacent silicon steel sheets. The flow-blocking surface can block the eddy current path of the magnet, thereby suppressing eddy current loss.

[0128] The magnets 220 are trapezoidal in shape, and their number is consistent with the number of yokeless iron cores 120. The upper base of the trapezoid of the magnets 220 faces inward, and the lower base of the trapezoid of the magnets 220 faces outward. That is, the width of the plurality of silicon steel sheets 221 that make up the magnets 220 increases radially from the inside to the outside.

[0129] like Figure 15 As shown, there is one stator 100 and two rotors 200. The two rotors 200 are air-gap positioned on opposite sides of the stator 100 to form a single-stator, dual-rotor axial magnetic field motor. Of course, depending on the number of rotors, a single-stator, single-rotor, or dual-stator, single-rotor axial magnetic field motor can be obtained.

[0130] Sixth Embodiment

[0131] like Figures 1 to 3 As shown, the manufacturing method of the axial magnetic field motor stator cooling structure is used to manufacture the axial magnetic field motor stator cooling structure 100 of any one of the first to third embodiments. The method includes the following steps:

[0132] a. A stator housing 110 is provided, wherein the stator housing 110 is provided with a plurality of circumferentially spaced core mounting holes 110a. The stator housing 110 includes an upper metal plate 111, a middle partition plate 112 and a lower metal plate 113. The core mounting holes 110a sequentially penetrate the upper metal plate 111, the middle partition plate 112 and the lower metal plate 113. The upper metal plate 111 has an upper splicing part 1112, and an upper flow channel 111a is provided on the upper splicing part 1112. The lower metal plate 113 has a lower splicing part 1132, and a lower flow channel 113a is provided on the lower splicing part 1132. The middle partition plate 112 is provided with a plurality of intermediate holes 112a.

[0133] b. The middle partition 112 is spliced ​​between the upper splicing part 1112 and the lower splicing part 1132 so that the middle hole 112a connects the upper flow channel 111a and the lower flow channel 113a;

[0134] c. Insert the yokeless iron core 120 into the iron core mounting hole 110;

[0135] d. Coil 130 is sleeved on both sides of the axial direction of the yokeless iron core 120, and the coil 130 is kept on both sides of the axial direction of the stator housing 110.

[0136] The shapes of the upper flow channel 111a and the lower flow channel 113a are similar to those in the first to third embodiments, and will not be described again here. The stator housing 110 has a split structure to facilitate the processing and formation of the upper flow channel 111a and the lower flow channel 113a. Then, the upper metal plate 111, the intermediate partition plate 112, and the lower metal plate 113 can be spliced ​​together, achieving manufacturability and reducing casting difficulty. At the same time, it facilitates the cleaning of the upper flow channel 111a exposed on the upper splicing part 1112 and the lower flow channel 113a exposed on the lower splicing part 1132.

[0137] In step b, the intermediate partition 112 is sealed between the upper metal plate 111 and the lower metal plate 113 to increase the sealing performance. The sealing connection includes using sealant, sealing rings, or welding.

[0138] An upper core mounting portion 1113 is provided through the upper metal plate 111, a lower core mounting portion 1133 is provided through the lower metal plate 113, and a middle core mounting portion 1123 is provided through the middle partition plate. Thus, in step b, the upper core mounting portion 1113, the middle core mounting portion 1123, and the lower core mounting portion 1133 correspondingly form core mounting holes 110a.

[0139] Following step d, the method further includes:

[0140] A slot wedge 140 is inserted between two adjacent unyoke cores 120 so that the coil 130 abuts between the slot wedge 140 and the stator housing 110.

[0141] The upper metal plate 111 is provided with an upper receiving portion 1111, and the lower metal plate 113 is provided with a lower receiving portion 1131. The upper receiving portion 1111 and the lower receiving portion 1131, in which the coil 130 is embedded, are filled with potting compound to fix the stator housing 110, the coil 130, the yokeless iron core 120, etc.

[0142] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A stator cooling structure (100) for an axial magnetic field motor, characterized in that, include: A stator housing (110) is provided, the stator housing (110) includes an upper metal plate (111), a middle partition plate (112) and a lower metal plate (113) spliced ​​along the axial direction, and the stator housing (110) is provided with a plurality of circumferentially spaced iron core mounting holes (110a), each of the iron core mounting holes passing through the upper metal plate (111), the middle partition plate (112) and the lower metal plate (113) in sequence. A plurality of yokeless iron cores (120) are installed in the iron core mounting holes (110a) and have both ends exposed on both sides of the stator housing (110); A plurality of coils (130) are sleeved on the yokeless iron core (120), and coils (130) are sleeved on both ends of the yokeless iron core exposed on both sides of the stator housing (110). An upper flow channel (111a) is provided on the surface where the upper metal plate (111) and the middle partition plate (112) are joined, and a lower flow channel (113a) is provided on the surface where the lower metal plate (113) and the middle partition plate (112) are joined. An intermediate hole (112a) is provided on the middle partition plate (112) to connect the upper flow channel (111a) and the lower flow channel (113a). The upper flow channel (111a) includes an upper main flow channel (111a1), a first upper branch flow channel (111a4), and a second upper branch flow channel (111a5). The upper main flow channel (111a1) is connected to the first upper branch flow channel (111a4), and the second upper branch flow channel (111a5) is independently arranged. The first upper branch flow channel (111a4) and the second upper branch flow channel (111a5) are arranged around the yokeless iron core (120) and form a flow channel notch (1110a) inside the yokeless iron core (120). The lower flow channel (113a) includes a lower main flow channel (113a1), a first lower branch flow channel (113a4), and a second lower branch flow channel (113a5). The lower main flow channel (113a1) is connected to the first lower branch flow channel (113a4), and the second lower branch flow channel (113a5) is independently provided. The first lower branch flow channel (113a4) and the second lower branch flow channel (113a5) are arranged around the yokeless iron core (120) and form a flow channel notch (1110a) inside the yokeless iron core (120). The intermediate partition plate (112) is provided with an intermediate hole (112a), which is arranged on both sides of the flow channel notch (1110a). The first upper flow channel (111a4) and the second lower flow channel (113a5) are connected through the intermediate hole (112a). The second upper flow channel (111a5) and the first lower flow channel (113a4) are connected through the intermediate hole (112a). The second upper flow channel (111a5) and the second lower flow channel (113a5) are connected through the intermediate hole (112a).

2. The axial magnetic field motor stator cooling structure (100) as described in claim 1, characterized in that, The second upper branch channel (111a5) comprises multiple independent channels, and the first upper branch channel (111a4) comprises multiple independent channels.

3. The axial magnetic field motor stator cooling structure (100) as described in claim 1, characterized in that, The first upper branch channel (111a4), the second lower branch channel (113a5), the second upper branch channel (111a5), and the first lower branch channel (113a4) are connected in sequence.

4. The axial magnetic field motor stator cooling structure (100) as described in claim 1, characterized in that, A flow interruption slit (1110a1) is provided on the flow channel notch (1110a).

5. The axial magnetic field motor stator cooling structure (100) as described in claim 3, characterized in that, The first upper branch channel (111a4), the second lower branch channel (113a5), the second upper branch channel (111a5), and the first lower branch channel (113a4), which are connected in sequence, are partially staggered and extended in the circumferential direction.

6. The axial magnetic field motor stator cooling structure (100) as described in claim 1, characterized in that, The first upper branch channel (111a4) includes a first water inlet branch (111a41), a first iron core outer ring upper branch (111a42), and a first iron core inter-upper branch (111a43). The first water inlet branch (111a41) connects the upper main channel (111a1) and the first iron core outer ring upper branch (111a42). The first iron core outer ring upper branch (111a42) connects two first iron core inter-upper branches (111a43). The first iron core inter-upper branch (111a43) is located between two adjacent yokeless iron cores (120). The second upper branch channel (111a5) includes an upper branch on the outer ring of the second iron core (111a52) and an upper branch between the second iron cores (111a53). The upper branch on the outer ring of the second iron core (111a52) connects to three upper branches between the second iron cores (111a53). The upper branches between the second iron cores (111a53) are located between two adjacent unyoke iron cores (120). The first lower branch channel (113a4) includes a first outlet branch (113a41), a first outer ring lower branch of the iron core (113a42), and a first inter-iron core lower branch (113a43). The first outlet branch (113a41) connects the lower main channel (113a1) and the first outer ring lower branch of the iron core (113a42). The first outlet branch (113a41) is connected to the center of the first outer ring lower branch of the iron core (113a42). The first outer ring lower branch of the iron core (113a42) connects to four first inter-iron core lower branches (113a43). The first inter-iron core lower branches (113a43) are arranged between two adjacent unyoke iron cores (120). The second lower branch channel (113a5) includes a second outer ring lower branch (113a52) and a second inter-core lower branch (113a53). The second outer ring lower branch (113a52) connects two second inter-core lower branches (113a53). The second inter-core lower branch (113a53) is located between two adjacent unyoke iron cores (120).

7. The axial magnetic field motor stator cooling structure (100) as described in claim 6, characterized in that, The number of the first inlet branch (111a41) and the first outlet branch (113a41) are two, and the center line connecting the two first inlet branches (111a41) is perpendicular to the center line connecting the two first outlet branches (113a41).

8. The axial magnetic field motor stator cooling structure (100) as described in claim 1, characterized in that, The upper main channel (111a1) includes an inlet (111a11) and an inlet loop (111a12). The inlet loop (111a12) surrounds the outside of the yokeless iron core (120). The inlet (111a11) connects the inlet loop (111a12) and the outer wall of the upper metal plate (111). The first upper branch channel (111a4) is connected to the inlet loop (111a12). The lower main channel (113a1) includes an outlet (113a11) and an outlet loop (113a12). The outlet loop (113a12) surrounds the outside of the yokeless iron core (120). The outlet (113a11) connects the outlet loop (113a12) and the outer wall of the lower metal plate (113). The first lower branch channel (113a4) is connected to the outlet loop (113a12).

9. An axial magnetic field motor, characterized in that, The axial magnetic field motor includes a stator cooling structure (100) as described in any one of claims 1 to 8, and the axial magnetic field motor further includes two rotors (200), which are air-gaply held on both sides of the yokeless core (120).

10. A method for manufacturing a stator cooling structure (100) for an axial magnetic field motor as described in any one of claims 1 to 8, characterized in that, Includes the following steps: a. A stator housing (110) is provided, wherein a plurality of circumferentially spaced core mounting holes (110a) are provided on the stator housing (110). The stator housing (110) includes an upper metal plate (111), a middle partition plate (112) and a lower metal plate (113). The core mounting holes (110a) pass through the upper metal plate (111), the middle partition plate (112) and the lower metal plate (113) in sequence. The upper metal plate (111) has an upper splicing part (1112) and an upper flow channel (111a) is provided on the upper splicing part (1112). The lower metal plate (113) has a lower splicing part (1132) and a lower flow channel (113a) is provided on the lower splicing part (1132). A plurality of intermediate holes (112a) are provided on the middle partition plate (112). b. The middle partition (112) is spliced ​​between the upper splicing part (1112) and the lower splicing part (1132) so that the middle hole (112a) connects the upper flow channel (111a) and the lower flow channel (113a). c. Insert the unyoke iron core (120) into the iron core mounting hole (110); d. A coil (130) is sleeved on both sides of the axial direction of the yokeless iron core (120), and the coil (130) is held on both sides of the axial direction of the stator housing (110).

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