An axial magnetic field motor and its stator cooling structure

Abstract

This invention provides an axial magnetic field motor and a stator cooling structure. The stator cooling zone structure includes an inward oil passage located radially outside the spray ring oil passage, and the inward oil passage is connected to the spray ring oil passage through the spray ring oil inlet. The inward oil passage includes several oil gaps between inward windings arranged circumferentially. An outward oil passage is located radially outside the spray ring oil passage, and the outward oil passage and the inward oil passage are arranged circumferentially. The spray ring oil passage is connected to the outward oil passage through several spray holes. The outward oil passage includes several oil gaps between outward winding inner rings arranged circumferentially. The housing inlet is connected to the inward oil passage, and the housing outlet is connected to the outward oil passage. The direction of the cooling medium can cover all the iron core windings and completely surround the outer periphery of each iron core winding, making reasonable use of space, effectively improving the cooling capacity, and thus ensuring the reliability of the stator.

Description

Technical Field

[0001] This invention relates to the field of axial magnetic field motors, and more particularly to an axial magnetic field motor and a stator cooling structure. 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, stator, and rotor, with the stator and rotor housed inside the housing. During operation, motors experience various losses, leading to heat generation. To improve motor efficiency, a cooling structure is required. Current cooling structures involve creating channels in the bottom plate of the housing and introducing a cooling medium to exchange heat with the heat-generating elements, thereby achieving cooling.

[0003] The main heat-generating element of an electric motor is the stator core winding. However, in the case of channels in the base plate, the cooling medium does not directly contact the core winding, resulting in poor heat exchange. Furthermore, creating channels inside the base plate increases manufacturing difficulty and can even affect its support capacity and strength. While existing technologies allow the cooling medium to be directly introduced into the stator cavity enclosed by the housing for contact heat exchange with the core winding installed within, multiple core windings are arranged circumferentially within the stator cavity, and the cooling medium flows within it. Consequently, some cooling medium inevitably fails to make contact with all core windings and is directly discharged. Therefore, ensuring that the flow of the cooling medium covers all core windings is a problem that urgently needs to be solved. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an axial magnetic field motor and a stator cooling structure that makes reasonable use of space, allowing the cooling medium to cover all core windings to ensure cooling capacity. Simultaneously, an insulating oil spraying ring and housing work together to form an oil spraying path, avoiding the defects of reduced housing support capacity and strength caused by the oil spraying path being located inside the housing.

[0005] According to one object of the present invention, the present invention provides a stator cooling structure, comprising:

[0006] The casing inlet, the spray ring injection oil passage, the inward oil passage, the outward oil passage, the spray ring inlet, and the casing outlet;

[0007] The inward oil passage is located radially outside the injection ring oil passage, and the inward oil passage is connected to the injection ring oil passage through the injection ring oil inlet. The inward oil passage includes a plurality of inward winding oil gaps arranged circumferentially.

[0008] The outward oil passage is located radially outside the spray ring oil passage. The outward oil passage and the inward oil passage are arranged circumferentially at intervals. The spray ring oil passage is connected to the outward oil passage through several spray holes. The outward oil passage includes several outward winding inner ring oil gaps arranged circumferentially at intervals.

[0009] The housing inlet is connected to the inward oil passage, and the housing outlet is connected to the outward oil passage.

[0010] In a preferred embodiment, the inward oil passage further includes an inward winding outer ring oil gap and an inward winding inner ring oil gap. The spray ring oil passage, the inward winding inner ring oil gap, and the inward winding outer ring oil gap are arranged radially from the inside to the outside. A plurality of inward winding inter-oil gaps are connected between the inward winding outer ring oil gap and the inward winding inner ring oil gap. The inward winding inner ring oil gap is connected to the spray ring oil passage through the spray ring oil inlet. The housing inlet is connected to the inward winding outer ring oil gap.

[0011] The outward oil passage further includes an outer ring oil gap and an inner ring oil gap of the outward winding. The spray ring oil passage, the inner ring oil gap, and the outer ring oil gap of the outward winding are arranged radially from the inside to the outside. A plurality of oil gaps between the inner ring oil gap and the outer ring oil gap of the outward winding are connected. The spray ring oil passage is connected to the inner ring oil gap of the outward winding through the spray hole. The outer ring oil gap of the outward winding is connected to the housing outlet.

[0012] As a preferred embodiment, it also includes:

[0013] A housing, the housing comprising an inner perimeter plate and a outer perimeter plate arranged radially, the housing inlet and the housing outlet being disposed on the outer perimeter plate;

[0014] A spray ring is connected to the outer ring of the inner circumference plate to form an oil spraying path between the spray ring and the inner circumference plate. The spray hole and the oil inlet of the spray ring are opened on the spray ring.

[0015] A plurality of iron core windings are arranged circumferentially and located between the outer peripheral plate and the spray ring. The outer peripheral plate and the spray ring are separated by a barrier, forming an inward oil passage and an outward oil passage. The barrier passes between two adjacent iron core windings and abuts against the outer peripheral plate and the spray ring. One of the barrier blocks the space between the housing inlet and the housing outlet. An inward winding oil gap is formed between two adjacent iron core windings located in the inward oil passage, and an outward winding inner ring oil gap is formed between two adjacent iron core windings located in the outward oil passage.

[0016] As a preferred embodiment, it further includes a manifold oil passage, wherein the manifold oil passage and the outward oil passage are arranged circumferentially and connected end to end in sequence, and the manifold oil passage is provided on at least one axial end face of the outer plate.

[0017] In a preferred embodiment, a flow divider is provided on the outer side of the inner enclosure, and the flow divider and the oil inlet of the spray ring are positioned opposite each other.

[0018] In a preferred embodiment, the spray ring oil path includes at least one cooling groove, wherein the cooling groove is formed by a recess on the side of the spray ring connected to the inner shroud, and / or the cooling groove is formed by a recess on the side of the inner shroud connected to the spray ring.

[0019] In a preferred embodiment, a plurality of the spray holes are arranged at circumferential intervals along the spray ring, and each spray hole is inclined relative to the axis.

[0020] In a preferred embodiment, the housing further includes two base plates, the outer plate, the inner plate and the spray ring are connected between the two base plates, and the axial ends of the iron core winding are respectively connected to the two base plates.

[0021] In a preferred embodiment, the iron core winding includes an iron core and a coil. A plurality of positioning slots are provided on the base plate, and the positioning slots on the two base plates correspond one to one. The iron core is inserted into the corresponding positioning slots of the two base plates, and the coil sleeved on the outer periphery of the iron core abuts between the two base plates.

[0022] According to another objective of the present invention, the present invention also provides an axial magnetic field motor, including a stator cooling structure 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 stator cooling structure.

[0023] Compared with existing technologies, this technical solution has the following advantages:

[0024] The cooling medium introduced through the housing inlet first enters the inward oil passage, and flows into the spray ring oil passage through the oil gaps between the inward windings and the oil inlet of the spray ring. Then, it is sprayed into the outward oil passage through several circumferentially spaced nozzles, and flows radially from the inside to the outside along the inner ring oil gaps of the outward windings until it converges at the housing outlet and is discharged from the housing outlet. Iron core windings are arranged between adjacent oil gaps between inward windings and between adjacent inner ring oil gaps of outward windings, so that the cooling medium can be evenly sprayed onto all iron core windings, ensuring that the cooling medium covers all iron core windings and completely surrounds the outer periphery of each iron core winding. This efficient use of space effectively enhances cooling capacity and thus ensures the reliability of the stator.

[0025] The spray ring and the housing cooperate to form an oil spraying channel for introducing cooling medium. The cooling medium is then sprayed onto the core windings within the stator cavity through spray holes on the spray ring, achieving a cooling effect. Compared to existing methods that involve machining the interior of the housing, only the spray ring needs to be machined, effectively reducing machining difficulty while ensuring the structural strength and support capacity of the housing.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the stator cooling structure described in this invention;

[0028] Figure 2 This is a schematic diagram of the stator cooling structure described in this invention;

[0029] Figure 3 This is a schematic diagram of the spray ring structure in the stator cooling structure described in this invention;

[0030] Figure 4 This is a schematic diagram of the inner shroud plate in the stator cooling structure described in this invention;

[0031] Figure 5 This is a schematic diagram of the outer plate in the stator cooling structure described in this invention;

[0032] Figure 6 This is a schematic diagram of the assembly of the housing and the spray ring in the stator cooling structure described in this invention.

[0033] In the diagram: 100 Stator cooling structure, 1001 Spray ring oil injection path, 1001a Cooling tank, 1002 Stator cavity, 110 Housing, 111 Enclosure plate, 111a Outer enclosure plate, 111b Inner enclosure plate, 111b1 Flow divider, 112 Base plate, 112a Positioning groove, 1101 Housing inlet, 1102 Housing outlet, 1103 Combining oil passage, 120 Spray ring, 121 Spray hole, 122 Spray ring oil inlet, 123 Barrier component, 130 Iron core winding, 131 Iron core, 132 Coil, 1300 Stator slot, 1110 Inward oil passage, 1110a Inward winding outer ring oil gap, 1110b Inward winding inter-winding oil gap, 1110c Inward winding inner ring oil gap, 1120 Outward oil passage, 1120a Outward winding outer ring oil gap, 1120b Oil gap between outward windings, and oil gap between the inner rings of the 1120c outward winding. Detailed Implementation

[0034] 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.

[0035] First Embodiment

[0036] like Figure 1 As shown, the stator cooling structure 100 includes: a housing inlet 1101, an oil spraying ring oil spraying passage 1001, an inward oil passage 1110, an outward oil passage 1120, an oil spraying ring oil inlet 122, and a housing outlet 1102.

[0037] The inward oil passage 1110 is located radially outside the spray ring oil passage 1001, and the inward oil passage 1110 is connected to the spray ring oil passage 1001 through the spray ring oil inlet 122. The inward oil passage 1110 includes a plurality of inward winding gaps 1110b arranged circumferentially.

[0038] The outward oil passage 1120 is located radially outside the spray ring oil passage 1001. The outward oil passage 1120 and the inward oil passage 1110 are arranged circumferentially at intervals. The spray ring oil passage 1001 is connected to the outward oil passage 1120 through a plurality of spray holes 121. The outward oil passage 1120 includes a plurality of outward winding inner ring oil gaps 1120c arranged circumferentially at intervals.

[0039] The housing inlet 1101 is connected to the inward oil passage 1110, and the housing outlet 1102 is connected to the outward oil passage 1120.

[0040] The cooling medium (including cooling oil) introduced through the housing inlet 1101 first enters the inward oil passage 1110, and flows into the spray ring oil passage 1001 through the inward winding oil gap 1110b and the spray ring oil inlet 122. Then, it is sprayed into the outward oil passage 1120 through several circumferentially spaced spray holes 121, and flows radially from the inside to the outside along the outward winding inner ring oil gap 1120c until it converges at the housing outlet 1102 and is discharged from the housing outlet 1102. Iron core windings 130 are arranged between adjacent inward winding oil gaps 1110b and between adjacent outward winding inner ring oil gaps 1120c, so that the cooling medium can be evenly sprayed onto all iron core windings 130, ensuring that the cooling medium covers all iron core windings and completely surrounds the outer periphery of each iron core winding 130. This makes efficient use of space, effectively improves cooling capacity, and thus ensures the reliability of the stator.

[0041] refer to Figure 1 The inward oil passage 1110 and the outward oil passage 1120 are arranged circumferentially, that is, they are not connected to each other in the circumferential direction, so as to avoid the cooling medium being unable to cover all the iron core windings 130.

[0042] Several nozzles 121 are circumferentially connected to the outward oil passage 1120 and the spray ring oil passage 1001, so that the cooling medium can be sprayed evenly onto the iron core winding 130, ensuring that all iron core windings 130 can be immersed in the cooling medium, thereby improving the cooling capacity.

[0043] like Figures 1 to 6 As shown, the stator cooling structure 100 further includes:

[0044] A housing 110 includes a surrounding plate 111, which is divided into an inner surrounding plate 111b and an outer surrounding plate 111a arranged radially. The housing inlet 1101 and the housing outlet 1102 are disposed on the outer surrounding plate 111a.

[0045] A spray ring 120 is connected to the outer ring of the inner circumference plate 111b to form the spray ring oil spraying passage 1001 between the spray ring 120 and the inner circumference plate 111b. The spray hole 121 and the spray ring oil inlet 122 are opened on the spray ring 120.

[0046] A plurality of iron core windings 130 are arranged circumferentially and located between the outer peripheral plate 111a and the spray ring 120. The outer peripheral plate 111a and the spray ring 120 are separated by a barrier 123, forming an inward oil passage 1110 and an outward oil passage 1120. The barrier 123 passes between two adjacent iron core windings 130 and abuts against the outer peripheral plate 111a and the spray ring 120. One of the barrier 123 blocks the space between the housing inlet 1101 and the housing outlet 1102. An inward winding oil gap 1110b is formed between two adjacent iron core windings 130 located in the inward oil passage 1110, and an outward winding inner ring oil gap 1120c is formed between two adjacent iron core windings 130 located in the outward oil passage 1120.

[0047] The spray ring 120 can be spliced ​​with the inner circumference plate 111b to form a spray ring oil spraying passage 1001 between the two. The spray ring 120 and the inner circumference plate 111b can be bonded and fixed with glue, while the spray ring 120 and the outer circumference plate 111a form a stator cavity 1002, wherein the inward oil passage 1110 and the outward oil passage 1120 are both located in the stator cavity 1002.

[0048] The spray ring 120 and the housing 110 cooperate to form an oil spraying passage 1001 for introducing cooling medium (including cooling oil, etc.). The cooling medium is then sprayed onto the core winding 130 within the stator cavity 1002 through the spray holes 121 on the spray ring 120, achieving a cooling effect. Compared to existing methods that involve machining the interior of the housing, only the spray ring 120 needs to be machined, effectively reducing machining difficulty while ensuring the structural strength and support capacity of the housing 110.

[0049] Furthermore, a gap must be maintained between the existing core winding 130 and the surrounding plate 111 to ensure insulation between them and prevent short circuits. In this case, the spray ring 120 can be made of insulating material, such as a plastic spray ring. By abutting the spray ring 120 between the core winding 130 and the surrounding plate 111, not only can the spray ring oil spraying path 1001 be formed between the spray ring 120 and the surrounding plate 111, while ensuring insulation between the core winding 130 and the surrounding plate 111, but it can also shorten the distance between the core winding 130 and the surrounding plate 111, thereby reducing the overall radial dimension and ensuring adaptability to the installation environment.

[0050] like Figure 1 As shown, the inward oil passage 1110 further includes an inward winding outer ring oil gap 1110a and an inward winding inner ring oil gap 1110c. The spray ring oil passage 1001, the inward winding inner ring oil gap 1110c, and the inward winding outer ring oil gap 1110a are arranged radially from the inside to the outside. A plurality of inward winding inter-oil gaps 1110b are connected between the inward winding outer ring oil gap 1110a and the inward winding inner ring oil gap 1110c. The inward winding inner ring oil gap 1110c is connected to the spray ring oil passage 1001 through the spray ring oil inlet 122. The housing inlet 1101 is connected to the inward winding outer ring oil gap 1110a.

[0051] The outward oil passage 1120 further includes an outward winding outer ring oil gap 1120a and an outward winding inner ring oil gap 1120c. The spray ring oil passage 1001, the outward winding inner ring oil gap 1120c, and the outward winding outer ring oil gap 1120a are arranged radially from the inside to the outside. A plurality of outward winding inter-oil gaps 1120b are connected between the outward winding inner ring oil gap 1120c and the outward winding outer ring oil gap 1120a. The spray ring oil passage 1001 is connected to the outward winding inner ring oil gap 1120c through the spray hole 121. The outward winding outer ring oil gap 1120a is connected to the housing outlet 1102.

[0052] Located within the inward oil passage 1110, an inward winding outer ring oil gap 1110a is formed between the iron core winding 130 and the outer plate 111a, and an inward winding inner ring oil gap 1110c is formed between the iron core winding 130 and the spray ring 120.

[0053] Located within the outward oil passage 1120, an outward winding outer ring oil gap 1120a is formed between the iron core winding 130 and the outer peripheral plate 111a, and an outward winding inner ring oil gap 1120c is formed between the iron core winding 130 and the spray ring 120.

[0054] The cooling medium introduced through the housing inlet 1101 first flows into the outer oil gap 1110a of the inward winding, then flows through the oil gaps 1110b between the inward windings to the inner oil gap 1110c of the inward winding, and then flows into the spray ring oil passage 1001 through the spray ring oil inlet 122. The spray ring oil passage 1001 then sprays the medium evenly into the inner oil gap 1120c of the outward winding through multiple spray holes 121, and then flows through the oil gaps 1120b between the outward windings to the outer oil gap 1120a of the outward winding. Finally, the cooling medium is collected at the housing outlet 1102 and discharged from the housing outlet 1102.

[0055] like Figure 1 As shown, the core winding 130 includes a core 131 and a coil 132. The coil 132 is sleeved around the outer periphery of the core 131. The coil 132 can be a copper coil, and its shape is adapted to the core 131. The core 131 is trapezoidal, with the upper base of the trapezoid facing inward and the lower base facing outward. A stator slot 1300 is formed between two adjacent core windings 130, which can be used for the passage of the cooling medium. It should be noted that when the coil 132 is tightly wound around the outer periphery of the core 131, the cooling medium can pass between the coils 132 of the two core windings 130, i.e., through the inward winding oil gap 1110b or the outward winding oil gap 1120b. Of course, there may also be a gap between the coil 132 and the iron core 131, that is, the cooling medium can pass through the gap between the coil 132 and the iron core 131 to contact the coil 132 and the iron core 131 at the same time, so as to further improve the cooling effect.

[0056] like Figure 2 and Figure 6As shown, the housing 110 includes two base plates 112, and a surrounding plate 111 is connected between the two base plates 112 and can be fixed with bolts. The bolts can be arranged on the surrounding plate 111 located radially inner and outer to ensure a stable connection. One of the base plates 112 can be integrally injection molded to the surrounding plate 111, while the other base plate 112 can be detachably connected to the surrounding plate 111 to realize the arrangement of the iron core winding 130 and the spray ring 120, which can increase the sealing performance. Of course, a sealing ring can also be added between the base plate 112 and the surrounding plate 111 to improve the sealing performance.

[0057] refer to Figure 1 and Figure 6 The base plate 112 has a plurality of positioning grooves 112a, and the positioning grooves 112a on the two base plates 112 correspond one to one. The iron core 131 is inserted into the corresponding positioning grooves 112a of the two base plates 112, and the coil 132 sleeved on the outer periphery of the iron core 131 abuts between the two base plates 112.

[0058] The positioning groove 112a is adapted to the shape of the iron core 131, both being trapezoidal. The iron core 131 can be reinforced and fixed in the positioning groove 112a with adhesive, ensuring the bonding strength and thus improving the stability of the structure. Furthermore, the positioning groove 112a allows the iron core winding 130 to be positioned and installed on the base plate 112, improving installation efficiency and ensuring the installation position. Similarly, the spray ring 120 is fixed between the two base plates 112, and the spray ring 120 and the base plate 112 can be bonded together with adhesive to separate the stator cavity 1002 and the spray ring oil spraying passage 1001.

[0059] The enclosure plate 111 can be made of high-strength metal or high-strength non-metallic materials. High-strength metal materials include alloy steel, aluminum alloy, etc., while high-strength non-metallic materials include glass fiber composites, carbon fiber composites, or plastics. Plastics include PPS, PPA, PA, PEEK, etc., to ensure the strength of the enclosure plate 111. The base plate 112 is made of non-metallic materials, such as glass fiber composites, carbon fiber composites, or plastics. The base plate 112 is relatively thin to ensure that both ends of the iron core winding 130 can respectively engage with the air gaps of the two rotors, thereby assembling a single-stator, dual-rotor axial magnetic field motor.

[0060] like Figure 2 As shown, the housing 110 is generally in the shape of a disc, that is, the surrounding plate 111 is in the shape of a ring. At this time, the spray ring 120 is also in the shape of a ring. Of course, the shape of the spray ring 120 can be adjusted as the shape of the housing 110 changes.

[0061] refer to Figure 1 and Figure 6 Two blocking members 123 are connected between the spray ring 120 and the outer plate 111a. The blocking members 123 pass between two adjacent iron core windings 130. The spray ring oil inlet 122 and the housing inlet 1101 are respectively located between the two blocking members 123, and one of the blocking members 123 blocks the housing inlet 1101 and the housing outlet 1102.

[0062] The cooling medium introduced through the housing inlet 1101 first passes between the two blocking members 123, flows from the spray ring oil inlet 122 into the spray ring oil spray passage 1001, and then is sprayed from the spray holes 121 on the spray ring 120 onto the iron core windings 130 located in the stator cavity 1002, and finally exits from the housing outlet 1102. One of the blocking members 123 blocks the housing inlet 1101 and the housing outlet 1102, preventing the cooling medium introduced through the housing inlet 1101 from being directly discharged from the housing outlet 1102 instead of first entering the spray ring oil spray passage 1001 and then being sprayed into the stator cavity 1002 through the spray holes 121. This ensures that the cooling medium can be evenly sprayed onto each of the iron core windings 130, improving the cooling effect.

[0063] like Figure 1 , Figure 3 and Figure 4 As shown, the spray ring oil path 1001 includes at least one cooling groove 1001a. The cooling groove 1001a is formed by a recess on the side of the spray ring 120 that is connected to the inner shroud 111b, and / or the cooling groove 1001a is formed by a recess on the side of the inner shroud 111b that is connected to the spray ring 120.

[0064] like Figure 1 and Figure 4 As shown, a flow divider 111b1 is provided on the outer side of the inner shroud 111b, and the flow divider 111b1 and the spray ring oil inlet 122 are directly opposite each other. The flow divider 111b1 can be triangular, and the apex of the triangle can be directly opposite the spray ring oil inlet 122. In this way, the cooling medium introduced from the spray ring oil inlet 122 is divided by the flow divider 111b1 and flows into the spray ring oil path 1001 from both sides of the flow divider 111b1, ensuring that the cooling medium can be sprayed evenly from each spray hole 121.

[0065] refer to Figure 1The circumferential dimension of the spray ring oil inlet 122 is approximately equal to the distance between the two blocking members 123. Currently, three iron core windings 130 are arranged between two adjacent blocking members 123. The circumferential dimension of the spray ring oil inlet 122 and the distance between the two blocking members 123 can limit the size of the cooling medium introduction channel. Therefore, the size of the cooling medium introduction channel can be adjusted by adjusting the circumferential dimension of the spray ring oil inlet 122 and the distance between the two blocking members 123 to regulate the flow resistance.

[0066] Continue to refer to Figure 1 Several nozzles 121 are spaced apart around the circumference of the spray ring 120 so that the cooling medium is sprayed evenly into the stator cavity 1002 from each circumferential angle, so that each core winding 130 can contact the cooling medium and ensure the cooling effect.

[0067] The nozzle 121 is positioned directly opposite the center of the core winding 130, so that the cooling medium ejected from the nozzle 121 is directly sprayed onto the radially inner side of the core winding 130, then passes between two adjacent core windings 130, and flows to the radially outer side of the core winding 130. In this way, the radially inner and outer sides of the core winding 130 can also contact the cooling medium, ensuring that the outer periphery of each core winding 130 can contact the cooling medium, thereby improving the cooling effect.

[0068] The two adjacent nozzles 121 are spaced apart by one core winding 130, and the nozzles 121 are arranged in a straight line and at an angle, as shown in the reference. Figure 1 However, it is not limited to this. By adjusting the size, shape and number of the nozzles 121, the oil output can be adjusted, which can make the coil 132 of the iron core winding 130 cool evenly.

[0069] like Figure 1 As shown, when the cooling medium passes between two adjacent core windings 130 and flows radially outward, the cooling medium is circumferential and discharged from the housing outlet 1102. Since two barrier elements 123 are arranged within the stator cavity 1002, the cooling medium located below the barrier elements 123 needs to move clockwise until it is discharged from the housing outlet 1102. During its flow, it continues to contact each of the core windings 130, significantly reducing the heat exchange effect. Therefore, by opening the confluence oil channel 1103 on the axial end face of the outer peripheral plate 111a, the cooling medium below the barrier elements 123 is directly guided to the housing outlet 1102 and discharged directly from the housing outlet 1102, preventing the already heat-exchanged cooling medium from continuing to contact the core windings 130 and affecting the cooling effect.

[0070] Specifically, at least one axial end face of the outer peripheral plate 111a is provided with a manifold oil passage 1103. The manifold oil passage 1103 is arranged circumferentially along the outer peripheral plate 111a, and both ends of the manifold oil passage 1103 are located outside the two blocking members 123 respectively, and communicate with the stator cavity 1002. (Refer to...) Figure 5 and Figure 1 The manifold oil passage 1103 and the outward oil passage 1120 are arranged circumferentially and connected end to end in sequence.

[0071] By opening the oil confluence channels 1103 on both axial end faces of the outer peripheral plate 111a, the fluidity is increased, thereby improving the discharge efficiency of the cooling medium after heat exchange.

[0072] In summary, the cooling medium introduced through the housing inlet 1101 first enters the inward oil passage 1110, and flows into the spray ring oil passage 1001 through the inward winding oil gap 1110b and the spray ring oil inlet 122. Then, it is sprayed into the outward oil passage 1120 through several circumferentially spaced spray holes 121, and flows radially from the inside to the outside along the outward winding inner ring oil gap 1120c until it converges at the housing outlet 1102 and is discharged from the housing outlet 1102. Iron core windings 130 are arranged between adjacent inward winding oil gaps 1110b and between adjacent outward winding inner ring oil gaps 1120c, so that the cooling medium can be evenly sprayed onto all iron core windings 130, ensuring that the cooling medium covers all iron core windings and completely surrounds the outer periphery of each iron core winding 130. This rational use of space effectively improves cooling capacity and ensures the reliability of the stator. The spray ring 120 and the housing 110 cooperate to form the spray ring oil spraying passage 1001, which is used to introduce cooling medium. The cooling medium is sprayed onto the iron core winding 130 in the stator cavity 1002 through the spray holes 121 on the spray ring 120 to achieve a cooling effect. Compared with the prior art method of machining the inside of the housing, only the spray ring 120 needs to be machined, effectively reducing the machining difficulty while ensuring the structural strength and support capacity of the housing 110. The spray ring 120 can abut against the inner circumference plate 111b of the housing 110, that is, the spray ring oil spraying passage 1001 can be formed on the radially inner side of the iron core winding 130. The spray ring 120 can be made of insulating material. By abutting the spray ring 120 between the iron core winding 130 and the surrounding plate 111, not only can the spray ring oil spraying passage 1001 be formed between the spray ring 120 and the surrounding plate 111, but also the insulation between the iron core winding 130 and the surrounding plate 111 can be guaranteed. Furthermore, the distance between the iron core winding 130 and the surrounding plate 111 can be shortened, thereby reducing the overall radial dimension and ensuring adaptability to the installation environment.

[0073] Second Embodiment

[0074] The present invention also provides an axial magnetic field motor, including the stator cooling structure 100 of the aforementioned embodiment. The axial magnetic field motor further includes two rotors, which are respectively air-gap maintained on both sides of the stator cooling structure 100. In this case, the axial magnetic field motor is a single-stator dual-rotor axial magnetic field motor.

[0075] Since the axial magnetic field motor adopts the stator cooling structure 100 of the above embodiment, the beneficial effects of the axial magnetic field motor can be referred to the stator cooling structure 100.

[0076] 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) characterized by, The application relates to a shell inlet (1101), a spray ring oil injection oil path (1001), an inward oil path (1110), an outward oil path (1120), a spray ring oil inlet (122) and a shell outlet (1102). The inward oil path (1110) is located on the radial outer side of the spray ring oil injection oil path (1001), and the inward oil path (1110) is communicated with the spray ring oil injection oil path (1001) through the spray ring oil inlet (122); the inward oil path (1110) comprises a plurality of inward inter-winding oil gaps (1110b) arranged in a circumferential direction. The outward oil path (1120) is located on the radial outer side of the spray ring oil injection oil path (1001), the outward oil path (1120) and the inward oil path (1110) are arranged in a circumferential direction, and the spray ring oil injection oil path (1001) is communicated with the outward oil path (1120) through a plurality of spray holes (121); the outward oil path (1120) comprises a plurality of outward inter-winding inner ring oil gaps (1120c) arranged in a circumferential direction. The shell inlet (1101) is communicated with the inward oil path (1110), and the shell outlet (1102) is communicated with the outward oil path (1120). The spray ring oil injection oil path (1001) is formed between an inner surrounding plate (111b) of a shell (110) and a spray ring (120). The inward oil path (1110) and the outward oil path (1120) are separated by a barrier (123) and are formed between an outer surrounding plate (111a) of the shell (110) and the spray ring (120). The application further relates to a shell (110) comprising an inner surrounding plate (111b) and an outer surrounding plate (111a) arranged in a radial direction; a shell inlet (1101) and a shell outlet (1102) are arranged on the outer surrounding plate (111a).

2. The stator cooling structure (100) as claimed in claim 1, characterized in that, A spray ring (120) is connected to the outer ring of the inner surrounding plate (111b), and a spray hole (121) and a spray ring oil inlet (122) are arranged on the spray ring (120). A plurality of iron core windings (130) are arranged in a circumferential direction and are located between the outer surrounding plate (111a) and the spray ring (120); the barrier (123) passes between two adjacent iron core windings (130) and abuts between the outer surrounding plate (111a) and the spray ring (120); one of the barriers (123) is arranged between the shell inlet (1101) and the shell outlet (1102) and is located in the inward oil path (1110) and between two adjacent iron core windings (130) to form an inward inter-winding oil gap (1110b); the outward oil path (1120) is located in the outward oil path (1120) and between two adjacent iron core windings (130) to form an outward inter-winding inner ring oil gap (1120c). ​ ​ 3. The stator cooling structure (100) as claimed in claim 2, characterized in that, The inward oil passage (1110) further includes an inward outer winding oil gap (1110a) and an inward inner winding oil gap (1110c). The spray ring oil passage (1001), the inward inner winding oil gap (1110c), and the inward outer winding oil gap (1110a) are arranged radially from the inside to the outside. A plurality of inward winding inter-oil gaps (1110b) are connected between the inward outer winding oil gap (1110a) and the inward inner winding oil gap (1110c). The inward inner winding oil gap (1110c) is connected to the spray ring oil passage (1001) through the spray ring oil inlet (122). The housing inlet (1101) is connected to the inward outer winding oil gap (1110a). The outward oil passage (1120) further includes an outward winding outer ring oil gap (1120a) and an outward winding inner ring oil gap (1120c). The spray ring oil passage (1001), the outward winding inner ring oil gap (1120c), and the outward winding outer ring oil gap (1120a) are arranged radially from the inside to the outside. A plurality of outward winding inter-oil gaps (1120b) are connected between the outward winding inner ring oil gap (1120c) and the outward winding outer ring oil gap (1120a). The spray ring oil passage (1001) is connected to the outward winding inner ring oil gap (1120c) through the spray hole (121). The outward winding outer ring oil gap (1120a) is connected to the housing outlet (1102).

4. The stator cooling structure (100) as claimed in claim 3, characterized in that, It also includes a manifold oil passage (1103), which and the outward oil passage (1120) are arranged circumferentially and connected end to end in sequence. The manifold oil passage (1103) is provided on at least one axial end face of the outer plate (111a).

5. The stator cooling structure (100) as claimed in claim 3, characterized in that, A flow divider (111b1) is provided on the outer ring of the inner circumference plate (111b), and the flow divider (111b1) and the oil inlet (122) of the spray ring are arranged opposite each other.

6. The stator cooling structure (100) as claimed in claim 3, wherein, The spray ring oil path (1001) includes at least one cooling groove (1001a), the cooling groove (1001a) is formed by a recess on the side of the spray ring (120) connected to the inner shroud (111b), and / or the cooling groove (1001a) is formed by a recess on the side of the inner shroud (111b) connected to the spray ring (120).

7. The stator cooling structure (100) as claimed in claim 1, wherein, A plurality of the spray holes (121) are arranged at intervals along the circumference of the spray ring (120), and each of the spray holes (121) is inclined relative to the axis of the spray ring (120).

8. The stator cooling structure (100) as claimed in claim 3, characterized in that, The housing (110) also includes two base plates (112), the outer plate (111a), the inner plate (111b) and the spray ring (120) are connected between the two base plates (112), and the axial ends of the iron core winding (130) are respectively connected to the two base plates (112).

9. The stator cooling structure (100) as claimed in claim 8, characterized in that, The iron core winding (130) comprises an iron core (131) and a coil (132), a plurality of positioning grooves (112a) are formed on the bottom plate (112), the positioning grooves (112a) on the two bottom plates (112) correspond one by one, the iron core (131) is inserted into the corresponding positioning grooves (112a) of the two bottom plates (112), and the coil (132) sleeved on the outer periphery of the iron core (131) abuts between the two bottom plates (112).

10. An axial field electric machine characterized by The axial magnetic field motor comprises the stator cooling structure (100) and two rotors, and the two rotors are respectively kept in air gaps on the two axial sides of the stator cooling structure (100).

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