Axial field motor and stator cooling structure

Abstract

The application provides an axial magnetic field motor and a stator cooling structure. The stator cooling structure comprises an outer ring oil gap of an iron core, an inner ring oil path, a plurality of inter-winding inward oil paths, a spray ring oil outlet, a plurality of inter-winding outward oil paths, a plurality of spray holes, a shell inlet, and a shell outlet. The outer ring oil gap of the iron core is located on a radial outer side of the inner ring oil path. The outer ring oil gap of the iron core and the inner ring oil path are connected. The spray ring oil outlet is located on a radial outer side of the inner ring oil path. The spray ring oil outlet and the inner ring oil path are connected. The spray ring oil outlet and the outer ring oil gap of the iron core are arranged in a circumferential direction. The spray ring oil path is located on a radial outer side of the outer ring oil gap of the iron core. The spray ring oil path and the outer ring oil gap of the iron core are connected through the plurality of spray holes. The spray ring oil path and the spray ring oil outlet are arranged in the circumferential direction. The shell inlet is connected to the spray ring oil path. The shell outlet is connected to the spray ring oil outlet. The flow direction of the cooling medium can cover all the iron core windings and can completely surround the outer periphery of each iron core winding. Space is reasonably utilized and the cooling capacity is effectively improved.

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 spray ring and housing work together to form an oil spraying path, avoiding the defects caused by the spraying path being located inside the housing, which would otherwise reduce the housing's support capacity and strength.

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

[0006] The components include: housing inlet, spray ring oil injection passage, iron core outer ring oil gap, winding inward oil passage, inner ring oil passage, winding outward oil passage, spray ring oil outlet, and housing outlet.

[0007] The outer ring oil gap of the iron core is located radially outside the inner ring oil passage, and a plurality of the winding inward oil passages are connected between the outer ring oil gap of the iron core and the inner ring oil passage.

[0008] The oil outlet of the spray ring is located radially outside the inner ring oil passage. Several winding-to-outward oil passages are connected between the oil outlet of the spray ring and the inner ring oil passage. The oil outlet of the spray ring and the oil gap of the outer ring of the iron core are spaced apart circumferentially.

[0009] The spray ring oil path is located radially outside the oil gap of the outer ring of the iron core. The spray ring oil path and the oil gap of the outer ring of the iron core are connected by a number of spray holes. The spray ring oil path and the spray ring oil outlet are arranged at intervals along the circumference.

[0010] The housing inlet is connected to the oil injection circuit of the spray ring, and the housing outlet is connected to the oil outlet of the spray ring.

[0011] As a preferred embodiment, it also includes:

[0012] A housing, the housing comprising an inner perimeter plate and a outer perimeter plate arranged radially, the housing inlet and the housing outlet being formed on the outer perimeter plate;

[0013] A spray ring is connected to the inner side of the outer peripheral plate to form a spray ring oil spraying passage between the spray ring and the outer peripheral plate. The spray hole and the spray ring oil outlet are opened on the spray ring, and the spray ring oil outlet and the housing outlet are directly opposite each other.

[0014] A plurality of iron core windings are arranged circumferentially and located between the inner shroud and the spray ring. An inner oil passage is formed between the iron core windings and the inner shroud. An outer oil gap is formed between the spray ring and the iron core winding opposite it. An inward oil passage is formed between two iron core windings opposite and adjacent to the spray ring. An outward oil passage is formed between two iron core windings opposite and adjacent to the oil outlet of the spray ring.

[0015] In a preferred embodiment, the oil outlet of the spray ring is separated from the oil injection path of the spray ring by a barrier member, which abuts between the iron core winding and the outer plate, wherein one of the barrier members is separated between the housing inlet and the housing outlet.

[0016] 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 outer plate, and / or the cooling groove is formed by a recess on the side of the outer plate connected to the spray ring.

[0017] In a preferred embodiment, the outer plate and the spray ring are respectively provided with cooling grooves, the cooling grooves on the outer plate and the spray ring are opposite to each other and connected, and the spray hole is located at the bottom of the cooling groove of the spray ring.

[0018] In a preferred embodiment, a plurality of the spray holes are arranged at circumferential intervals along the spray ring, and each of the spray holes is arranged in a straight line along the axial direction.

[0019] In a preferred embodiment, the nozzle is positioned directly opposite the center of the iron core winding.

[0020] In a preferred embodiment, the housing further includes two base plates, the outer peripheral 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 is introduced into the oil spraying passage of the spray ring through the housing inlet, and then evenly sprayed into the oil gap of the outer ring of the iron core through the circumferentially spaced spray holes. Subsequently, it flows from the winding inter-inner oil passage to the inner ring oil passage, while the cooling oil in the inner ring oil passage 1106 flows through the winding inter-outer oil passage to the oil outlet of the spray ring until it is discharged from the housing outlet. The oil passages between two adjacent windings are used to accommodate the iron core windings so that 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.

[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 outer plate in the stator cooling structure described in this invention.

[0031] In the diagram: 100 Stator cooling structure, 1001 Spray ring oil spray path, 1001a Cooling tank, 1002 Stator cavity, 110 Housing, 111 Enclosure plate, 111a Outer enclosure plate, 111b Inner enclosure plate, 111b1 Diverter platform, 112 Base plate, 112a Positioning groove, 1101 Housing inlet, 1102 Housing outlet, 1104 Iron core outer ring oil gap, 1105 Inward oil path between windings, 1106 Inner ring oil path, 1107 Outward oil path between windings, 120 Spray ring, 121 Spray hole, 122 Spray ring oil outlet, 123 Barrier component, 130 Iron core winding, 131 Iron core, 132 Coil, 1300 Stator slot. Detailed Implementation

[0032] 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.

[0033] First Embodiment

[0034] like Figure 1 As shown, the stator cooling structure 100 includes:

[0035] The casing inlet 1101, the spray ring oil injection passage 1001, the iron core outer ring oil gap 1104, the winding inward oil passage 1105, the inner ring oil passage 1106, the winding outward oil passage 1107, the spray ring oil outlet 122, and the casing outlet 1102.

[0036] The outer ring oil gap 1104 of the iron core is located radially outside the inner ring oil passage 1106, and a plurality of the winding inward oil passages 1105 are connected between the outer ring oil gap 1104 of the iron core and the inner ring oil passage 1106.

[0037] The spray ring oil outlet 122 is located radially outside the inner ring oil passage 1106. A plurality of winding-to-outward oil passages 1107 are connected between the spray ring oil outlet 122 and the inner ring oil passage 1106. The spray ring oil outlet 122 and the outer ring oil gap 1104 of the iron core are arranged circumferentially.

[0038] The spray ring oil injection passage 1001 is located radially outside the oil gap 1104 of the outer ring of the iron core. The spray ring oil injection passage 1001 and the oil gap 1104 of the outer ring of the iron core are connected by a number of spray holes 121. The spray ring oil injection passage 1001 and the spray ring oil outlet 122 are arranged at intervals along the circumference.

[0039] The housing inlet 1101 is connected to the oil injection passage 1101 of the spray ring, and the housing outlet 1102 is connected to the oil outlet 122 of the spray ring.

[0040] The cooling medium (including cooling oil) is introduced into the spray ring oil passage 1001 through the housing inlet 1101, and then evenly sprayed into the outer ring oil gap 1104 of the iron core through the circumferentially spaced spray holes 121. Subsequently, it flows from the winding-inward oil passage 1105 to the inner ring oil passage 1106. The cooling oil in the inner ring oil passage 1106 flows through the winding-outward oil passage 1107 to the spray ring oil outlet 122, until it is discharged from the housing outlet 1102. The space between two adjacent winding-inward oil passages 1105 and two adjacent winding-outward oil passages 1107 is used to accommodate the iron core windings 130, so that the direction of the cooling medium can cover all the iron core windings and completely surround the outer periphery of each iron core winding 130, making reasonable use of space, effectively improving the cooling capacity, and thus ensuring the reliability of the stator.

[0041] refer to Figure 1 A plurality of inward oil passages 1105 and a plurality of outward oil passages 1107 between windings are arranged circumferentially, wherein the number of inward oil passages 1105 between windings is significantly greater than the number of outward oil passages 1107 between windings. The inward oil passages 1105 between windings are connected to the oil gap 1104 of the outer ring of the iron core, while the outward oil passages 1107 between windings are connected to the oil outlet 122 of the spray ring. That is, the oil spray passage 1001 of the spray ring is connected to the inward oil passages 1105 between windings through the oil gap 1104 of the outer ring of the iron core, and the outward oil passages 1107 between windings are connected to the housing outlet 1102 through the oil outlet 122 of the spray ring.

[0042] Continue to refer to Figure 1Several nozzles 121 are circumferentially spaced between the spray ring oil path 1001 and the outer ring oil gap 1104 of the iron core, so that the cooling medium can be evenly sprayed into the outer ring oil gap 1104 of the iron core, ensuring that all iron core windings 130 can be immersed in the cooling medium, thereby improving the cooling capacity.

[0043] like Figure 1 and Figure 2 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 formed on the outer surrounding plate 111a.

[0045] A spray ring 120 is connected to the inner side of the outer plate 111a to form a spray ring oil spraying passage 1001 between the spray ring 120 and the outer plate 111a. The spray hole 121 and the spray ring oil outlet 122 are opened on the spray ring 120. The spray ring oil outlet 122 and the housing outlet 1102 are directly opposite each other.

[0046] A plurality of iron core windings 130 are arranged circumferentially and located between the inner shroud 111b and the spray ring 120. An inner ring oil passage 1106 is formed between the iron core windings 130 and the inner shroud 111b. An outer ring oil gap 1104 is formed between the spray ring 120 and the iron core windings 130 opposite to it. An inward oil passage 1105 is formed between two iron core windings 130 opposite to and adjacent to the spray ring 120. An outward oil passage 1107 is formed between two iron core windings 130 opposite to and adjacent to the oil outlet 122 of the spray ring.

[0047] The spray ring 120 can be spliced ​​with the outer plate 111a to form a spray ring oil spraying passage 1001 between the two. The spray ring 120 and the outer plate 111a can be fixed together by adhesive. The spray ring 120 and the inner plate 111b form a stator cavity 1002. The inward oil passage 1105 between windings, the outward oil passage 1107 between windings, the outer ring oil gap 1104 of the iron core, the inward oil passage 1105 between windings, the inner ring oil passage 1106, and the outward oil passage 1107 between windings are all 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 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., an inward oil passage 1105 or an outward oil passage 1107 between the windings. 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.

[0051] like Figure 2As 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 on the radially inner and outer sides 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, etc. This 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.

[0052] The base plate 112 has a plurality of positioning slots 112a, and the positioning slots 112a on the two base plates 112 correspond one to one. The iron core 131 is inserted into the corresponding positioning slots 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.

[0053] 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 glue, 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.

[0054] 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 glue to separate the stator cavity 1002 and the spray ring oil spraying passage 1001.

[0055] 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.

[0056] 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.

[0057] like Figures 1 to 3 As shown, the outer plate 111a is provided with a housing inlet 1101 and a housing outlet 1102. The housing inlet 1101 is connected to the oil injection passage 1001 of the spray ring, and the housing outlet 1102 is connected to the stator cavity 1002. In this way, the cooling medium is first introduced into the oil injection passage 1001 of the spray ring through the housing inlet 1101, and then sprayed into the stator cavity 1002 through the spray hole 121 on the spray ring 120 to cool the iron core winding 130 in the stator cavity 1002. After the heat exchange in the stator cavity 1002, the cooling medium is discharged from the housing outlet 1102.

[0058] like Figure 1 and Figure 3 As shown, the spray ring 120 has a spray ring oil outlet 122. The spray ring oil outlet 122 and the spray ring oil injection passage 1001 are arranged circumferentially around the spray ring 120. The spray ring oil outlet 122 is opposite to the housing outlet 1102. The housing outlet 1102 is connected to the stator cavity 1002 through the spray ring oil outlet 122. That is, the cooling medium after heat exchange in the stator cavity 1002 flows from the spray ring oil outlet 122 to the housing outlet 1102 and is discharged from the housing outlet 1102. (Reference) Figure 1 .

[0059] Furthermore, the spray ring 120 is provided with two blocking members 123. One blocking member 123 is provided on each side of the inlet / outlet hole 122 at a distance from the spray ring oil injection passage 1001. That is, the spray ring oil outlet 122 is blocked from the spray ring oil injection passage 1001 by the blocking member 123. The blocking member 123 abuts against the iron core winding 130 and the outer peripheral plate 111a, with one blocking member 123 blocking between the housing inlet 1101 and the housing outlet 1102. This prevents the cooling medium introduced through the housing inlet 1101 from directly exiting clockwise from the housing outlet 1102, and also prevents the cooled medium after heat exchange from exiting through the housing inlet 1101.

[0060] like Figure 1 As shown, the cooling medium introduced by the housing inlet 1101 flows counterclockwise in the spray ring oil passage 1001 under the obstruction of the barrier 123. The cooling medium in the spray ring oil passage 1001 is sprayed into the stator cavity 1002 through a plurality of spray holes 121. The cooling medium passes between two adjacent iron core windings 130 and flows from the radial outer side of the iron core windings 130 to the radial inner side to converge. Finally, it passes through the gap between the iron cores 131 opposite to the spray ring oil outlet 122 until it is discharged from the housing outlet 1102.

[0061] like Figure 1 and Figure 2 As shown, the housing 110 also includes an inner shroud 111b, which is connected between the two base plates 112, and a rotating shaft is centrally connected to the inner shroud 111b. When the cooling medium flows to the radially inner side of the core winding 130, it travels along the outer periphery of the inner shroud 111b until it passes through the gap between the core 131 opposite to the oil outlet 122 of the spray ring.

[0062] Continue to refer to Figure 1 The circumferential dimension of the spray ring oil outlet 122 is approximately equal to the distance between the two blocking members 123. Currently, each blocking member 123 abuts against one iron core winding 130, and an iron core winding 130 is arranged between two adjacent blocking members 123. The circumferential dimension of the spray ring oil outlet 122 and the distance between the two blocking members 123 can limit the size of the cooling medium discharge channel. Therefore, the size of the cooling medium discharge channel can be adjusted by adjusting the circumferential dimension of the spray ring oil outlet 122 and the distance between the two blocking members 123 to regulate the flow resistance.

[0063] like Figure 1 and Figure 3 As shown, a plurality of spray holes 121 are arranged at intervals along the circumference of the spray ring 120 so that the cooling medium is evenly sprayed into the stator cavity 1002 from each circumferential angle, so that each of the iron core windings 130 can contact the cooling medium and ensure the cooling effect.

[0064] refer to Figure 1 The nozzle 121 is positioned directly opposite the center of the core winding 130, allowing the cooling medium ejected from the nozzle 121 to be sprayed directly onto the radially outer side of the core winding 130. It then passes between two adjacent core windings 130 and flows towards the radially inner side of the core winding 130. This ensures that the radially outer side of each core winding 130 is in contact with the cooling medium, thereby improving the cooling effect. When the spray ring 120 abuts against the core winding 130, the nozzle 121 corresponds to the gap between two core windings 130.

[0065] The two adjacent nozzles 121 are spaced apart by one core winding 130. The nozzles 121 are straight, but not limited to this. By adjusting the size, shape and number of nozzles 121, the oil output can be adjusted, so that the coil 132 of the core winding 130 can be cooled evenly.

[0066] like Figure 3 and Figure 4As shown, the spray ring oil injection 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 outer plate 111a, and / or the cooling groove 1001a is formed by a recess on the side of the outer plate 111a connected to the spray ring 120.

[0067] The cooling groove 1001a can be formed only on the spray ring 120. This way, only the cooling groove 1001a needs to be processed, reducing the processing difficulty, while ensuring the strength and support capacity of the housing 110. At this time, the spray hole 121 is located at the bottom of the cooling groove 1001a of the spray ring 120.

[0068] Of course, the cooling groove 1001a can be formed on the outer plate 111a of the housing 110. Since only the inner wall of the outer plate 111a is processed, it is equivalent to reducing the processing difficulty of the inner shell.

[0069] When the outer plate 111a and the spray ring 120 are respectively provided with cooling grooves 1001a, the volume of the cooling grooves 1001a can be increased. At this time, the cooling grooves 1001a on the outer plate 111a and the spray ring 120 are opposite to each other and connected. The spray hole 121 is located at the bottom of the cooling groove 1001a of the spray ring 120.

[0070] like Figure 1 and Figure 3 As shown, the circumferential dimension of the cooling tank 1001a is much larger than the circumferential dimension of the oil outlet 122 of the spray ring.

[0071] Since the cooling medium in the oil injection passage 1001 of the spray ring needs to be sprayed into the stator cavity 1002 through the spray holes 121 on the spray ring 120, the sealing requirement between the spray ring 120 and the outer peripheral plate 111a is not high; that is, the two ends of the spray ring 120 in the axial direction can be directly fixed to the two base plates 112. To ensure the strength of the spray ring 120, several reinforcing ribs can be provided on the side of the spray ring 120 facing the iron core winding 130 to prevent the spray ring 120 from deforming. The reinforcing ribs are staggered from the spray holes 121 and abut against the iron core winding 130.

[0072] In summary, the cooling medium is introduced into the spray ring oil passage 1001 through the housing inlet 1101, and then evenly sprayed into the outer ring oil gap 1104 of the iron core through the circumferentially spaced spray holes 121. Subsequently, it flows from the winding-inward oil passage 1105 to the inner ring oil passage 1106. The cooling oil in the inner ring oil passage 1106 flows through the winding-outward oil passage 1107 to the spray ring oil outlet 122, until it is discharged from the housing outlet 1102. The space between two adjacent winding-inward oil passages 1105 and two adjacent winding-outward oil passages 1107 is used to accommodate the iron core windings 130, so that the direction of the cooling medium can cover all the iron core windings and completely surround the outer periphery of each iron core winding 130, making reasonable use of space, effectively improving the cooling capacity, and thus ensuring 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 outer plate 111a of the housing 110, that is, the spray ring oil spraying passage 1001 can be formed on the radially outer 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 in that, include: Injection ring fuel injection circuit The casing inlet (1101), the spray ring oil injection passage (1001), the iron core outer ring oil gap (1104), the winding inward oil passage (1105), the inner ring oil passage (1106), the winding outward oil passage (1107), the spray ring oil outlet (122), and the casing outlet (1102). The outer ring oil gap (1104) of the iron core is located radially outside the inner ring oil passage (1106), and a plurality of the winding inward oil passages (1105) are connected between the outer ring oil gap (1104) of the iron core and the inner ring oil passage (1106). The spray ring oil outlet (122) is located radially outside the inner ring oil passage (1106). A plurality of winding-to-outer oil passages (1107) are connected between the spray ring oil outlet (122) and the inner ring oil passage (1106). The spray ring oil outlet (122) and the outer ring oil gap (1104) of the iron core are spaced apart circumferentially. The spray ring oil path (1001) is located radially outside the oil gap (1104) of the outer ring of the iron core. The spray ring oil path (1001) and the oil gap (1104) of the outer ring of the iron core are connected by a number of spray holes (121). The spray ring oil path (1001) and the spray ring oil outlet (122) are arranged circumferentially. The housing inlet (1101) is connected to the oil injection passage (1101) of the spray ring, and the housing outlet (1102) is connected to the oil outlet (122) of the spray ring. The circumferential distribution range of the spray ring oil outlet (122) corresponds to the outlet position of all the outward oil passages (1107) between the windings, and the circumferential distribution range of the spray ring oil passage (1101) corresponds to the inlet position of all the inward oil passages (1105) between the windings. The spray ring oil passage (1001) and the spray ring oil outlet (122) do not overlap in the circumferential distribution range.

2. The stator cooling structure (100) as described in claim 1, characterized in that, Also includes: A housing (110) includes an inner circumferential plate (111b) and an outer circumferential plate (111a) arranged radially. The housing inlet (1101) and the housing outlet (1102) are formed on the outer circumferential plate (111a). A spray ring (120) is connected to the inner side of the outer plate (111a) to form a spray ring oil spraying passage (1001) between the spray ring (120) and the outer plate (111a). The spray hole (121) and the spray ring oil outlet (122) are opened on the spray ring (120). The spray ring oil outlet (122) and the housing outlet (1102) are directly opposite each other. A plurality of iron core windings (130) are arranged circumferentially and located between the inner shroud (111b) and the spray ring (120). An inner ring oil passage (1106) is formed between the iron core windings (130) and the inner shroud (111b). An outer ring oil gap (1104) is formed between the spray ring (120) and the iron core windings (130) opposite to it. An inward oil passage (1105) is formed between two iron core windings (130) opposite to and adjacent to the spray ring (120). An outward oil passage (1107) is formed between two iron core windings (130) opposite to and adjacent to the oil outlet (122) of the spray ring.

3. The stator cooling structure (100) as described in claim 2, characterized in that, The oil outlet (122) of the spray ring is separated from the oil injection passage (1001) of the spray ring by a barrier (123). The barrier (123) abuts between the iron core winding (130) and the outer plate (111a). One of the barrier (123) is separated between the housing inlet (1101) and the housing outlet (1102).

4. The stator cooling structure (100) as described in claim 2, characterized in that, 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 outer plate (111a), and / or the cooling groove (1001a) is formed by a recess on the side of the outer plate (111a) connected to the spray ring (120).

5. The stator cooling structure (100) as described in claim 4, characterized in that, The outer plate (111a) and the spray ring (120) are respectively provided with cooling grooves (1001a). The cooling grooves (1001a) on the outer plate (111a) and the spray ring (120) are arranged opposite to each other and connected. The spray hole (121) is located at the bottom of the cooling groove (1001a) of the spray ring (120).

6. The stator cooling structure (100) as described in claim 2, characterized in that, A plurality of the spray holes (121) are arranged at circumferential intervals along the spray ring (120), and each of the spray holes (121) is arranged in a straight line along the axial direction.

7. The stator cooling structure (100) as described in claim 2, characterized in that, The nozzle (121) is directly opposite the center of the iron core winding (130).

8. The stator cooling structure (100) as described in claim 2, characterized in that, The housing (110) also includes two base plates (112), the outer plate (111a) and the spray ring (120) are connected between the two base plates (112), and the two axial ends of the iron core winding (130) are respectively connected to the two base plates (112).

9. The stator cooling structure (100) as described in claim 8, characterized in that, The iron core winding (130) includes an iron core (131) and a coil (132). A plurality of positioning slots (112a) are provided on the base plate (112). The positioning slots (112a) on the two base plates (112) correspond one to one. The iron core (131) is inserted into the corresponding positioning slots (112a) of the two base plates (112). The coil (132) sleeved on the outer periphery of the iron core (131) abuts between the two base plates (112).

10. An axial magnetic field motor, characterized in that, Including the stator cooling structure (100) as described in any one of claims 1 to 9, the axial magnetic field motor further includes two rotors, which are respectively air-gaply held on both sides of the stator cooling structure (100).

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