Stator unit and axial flux motor

Abstract

The utility model relates to the technical field of axial magnetic flux motors, in particular to a stator unit and an axial magnetic flux motor, and aims to solve the problems that cooling liquid leaks due to glue injection of a shell and the protective performance and the safety are reduced. The stator unit comprises a stator shell and a stator winding; the plurality of stator windings are annularly arrayed in the stator shell; the stator shell comprises an upper positioning cover plate, a lower positioning cover plate, an inner circular ring and an outer circular ring; the upper positioning cover plate and the lower positioning cover plate abut against the stator winding. Rib plates are arranged on the sides, close to each other, of the upper positioning cover plate and the lower positioning cover plate, and a stator winding is arranged between every two adjacent rib plates. According to the utility model, the rib plates are arranged to improve the strength of the upper positioning cover plate, the lower positioning cover plate and the stator shell, and the strength of the shell is prevented from being improved through glue injection, so that the leakage of cooling liquid caused by thermal deformation of a glue injection layer is avoided, and the protection performance and the safety of the motor are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flux motors, in particular to a stator unit and an axial flux motor. Background Art

[0002] In existing axial flux motors, the stator is mostly supported by an aluminum alloy housing, and the adjacent stator windings are supported by an aluminum alloy positioning frame, which hinders the cooling channels, affects the circulation of the coolant, and reduces the cooling effect. At the same time, placing the positioning frame to support and separate the stator windings also reduces the full slot rate of the motor and generates induced current loss and eddy current loss in the positioning frame, thereby reducing the motor efficiency. In addition, the use of the positioning frame also increases the risk of short circuit between the stator windings. Therefore, a housing without a bracket between the stator windings is designed and made of a non-metallic material. However, in order to improve the strength of the housing and the sealing performance of the cooling channels, the inside of the housing is strengthened by injecting glue, but this method is prone to coolant leakage due to factors such as the thermal deformation of the glue injection layer, reducing the protection performance and safety of the motor. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a stator unit and an axial flux motor to solve the problems of coolant leakage caused by glue injection in the existing housing and the resulting decline in protection performance and safety.

[0004] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] A stator unit includes a stator housing and stator windings; a plurality of the stator windings are annularly arrayed in the stator housing;

[0006] The stator housing includes an upper positioning cover plate, a lower positioning cover plate, an inner ring and an outer ring;

[0007] The inner ring is inserted into the outer ring and is coaxially arranged with the outer ring; the upper positioning cover plate and the lower positioning cover plate are respectively connected to both ends of the inner ring and both ends of the outer ring;

[0008] The upper positioning cover plate and the lower positioning cover plate respectively abut against both ends of the stator windings;

[0009] Reinforcing plates are arranged on one side of the upper positioning cover plate and the lower positioning cover plate close to each other, and the stator windings are arranged between two adjacent reinforcing plates.

[0010] Further, positioning grooves are arranged on both the upper positioning cover plate and the lower positioning cover plate, the reinforcing plates are arranged between two adjacent positioning grooves; both ends of the stator windings are respectively clamped in the positioning grooves of the upper positioning cover plate and the lower positioning cover plate.

[0011] Further, the rib plates of the upper positioning cover plate extend along the radial direction of the upper positioning cover plate;

[0012] The rib plates of the lower positioning cover plate extend along the radial direction of the lower positioning cover plate.

[0013] Further, the stator winding includes a stator core and a coil winding sleeved on the stator core;

[0014] Both ends of the stator core are respectively abutted against the upper positioning cover plate and the lower positioning cover plate;

[0015] The coil winding is arranged between two adjacent rib plates and contacts with the rib plates.

[0016] Further, a limiting card slot is formed on the outer wall of the outer ring, and the limiting card slot extends along the axial direction of the outer ring.

[0017] Further, the stator housing further includes a lead pipe, and the lead pipe is installed on the upper positioning cover plate and communicates with the inner cavity of the stator housing.

[0018] Further, the upper positioning cover plate, the lower positioning cover plate, the inner ring and the outer ring are made of glass fiber reinforced PEEK composite material.

[0019] Further, the outer ring, the upper positioning cover plate, the lower positioning cover plate and the stator winding enclose a first annular flow channel;

[0020] The inner ring, the upper positioning cover plate, the lower positioning cover plate and the stator winding enclose a second annular flow channel;

[0021] The rib plates of the upper positioning cover plate, the rib plates of the lower positioning cover plate and the stator winding enclose a radial flow channel;

[0022] One end of the radial flow channel communicates with the first annular flow channel, and the other end communicates with the second annular flow channel; the first annular flow channel, the second annular flow channel and the radial flow channel form a cooling channel;

[0023] Cooling ports are arranged on the outer ring, and the two cooling ports are evenly distributed around the axis of the outer ring and communicate with the first annular flow channel.

[0024] Further, the upper positioning cover plate is connected to the inner ring and the outer ring by screws, and the joint is sealed with sealant;

[0025] The lower positioning cover plate is integrally injection molded with or connected to the inner ring and the outer ring by screws, and the joint is sealed with sealant.

[0026] On the other hand of the present utility model, an axial flux motor is proposed, which includes the above-mentioned stator unit and further includes a rotor unit. Two rotor units are arranged on both sides of the stator unit and are coaxially arranged with the stator unit.

[0027] Integrating the above technical solutions, the technical effects that the present utility model can achieve are as follows:

[0028] The stator unit provided by the present utility model includes a stator housing and stator windings; a plurality of stator windings are annularly arrayed inside the stator housing; the stator housing includes an upper positioning cover plate, a lower positioning cover plate, an inner ring and an outer ring; the inner ring is inserted into the outer ring and is coaxially arranged with the outer ring; the upper positioning cover plate and the lower positioning cover plate are respectively connected to both ends of the inner ring and both ends of the outer ring; the upper positioning cover plate and the lower positioning cover plate respectively abut against both ends of the stator windings; rib plates are arranged on the sides of the upper positioning cover plate and the lower positioning cover plate that are close to each other, and the stator windings are arranged between two adjacent rib plates.

[0029] The stator unit provided by the present utility model improves the strength of the upper positioning cover plate, the lower positioning cover plate and the stator housing by arranging rib plates on the sides of the upper positioning cover plate and the lower positioning cover plate that are close to each other, thereby preventing deformation. This enables the stator housing to ensure the strength of the non-metallic housing without internal injection molding, avoiding coolant leakage caused by the heat deformation of the injection molding layer, and thus ensuring the protection performance and safety of the motor. In addition, the injection molding is not required, which also improves the maintainability of the stator unit. When some stator windings are damaged, only the stator housing needs to be opened and the damaged stator windings can be replaced. However, in the case of injection molding, since both ends of the stator windings are inserted into the injection molding layer, once the stator windings are damaged, it is difficult to repair and replace. The stator windings are not easy to take out, the attached colloid is not easy to clean, and it cannot be reassembled. If reassembled, the injection molding layer needs to be completely removed and reinjected, resulting in extremely high costs. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of the stator unit provided by an embodiment of the present utility model;

[0032] Figure 2 It is a front view of the stator unit provided by an embodiment of the present utility model;

[0033] Figure 3 For Figure 2 A-A cross-sectional view in

[0034] Figure 4 is Figure 3 The partial enlarged view at position B in

[0035] Figure 5 is the structural schematic diagram of the stator housing provided by the embodiment of the present utility model;

[0036] Figure 6 is the structural schematic diagram of the upper positioning cover plate;

[0037] Figure 7 is the front view of the upper positioning cover plate;

[0038] Figure 8 is Figure 7 the enlarged view at position C in

[0039] Figure 9 is the structural schematic diagram of the inner ring;

[0040] Figure 10 is the structural schematic diagram of the outer ring;

[0041] Figure 11 is the structural schematic diagram of the stator winding;

[0042] Figure 12 is the structural schematic diagram of the stator core.

[0043] Icon: 100 - stator housing; 200 - stator winding; 110 - upper positioning cover plate; 120 - lower positioning cover plate; 130 - inner ring; 140 - outer ring; 150 - lead pipe; 111 - rib plate; 112 - positioning groove; 131 - cylindrical boss; 132 - first threaded hole; 141 - limit card slot; 142 - rectangular boss; 143 - second threaded hole; 144 - third threaded hole; 210 - stator core; 220 - coil winding; 101 - first annular flow channel; 102 - second annular flow channel; 103 - radial flow channel; 104 - cooling port. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0045] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0046] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0047] In the existing stator unit, due to insufficient strength of the non-metallic housing, glue injection is required, and the glue injection layer is prone to coolant leakage due to factors such as thermal deformation, reducing the protection performance and safety of the motor.

[0048] In view of this, the present invention provides a stator unit, including a stator housing 100 and a stator winding 200; a plurality of stator windings 200 are annularly arrayed in the stator housing 100; the stator housing 100 includes an upper positioning cover plate 110, a lower positioning cover plate 120, an inner ring 130 and an outer ring 140; the inner ring 130 is inserted into the outer ring 140 and is coaxially arranged with the outer ring 140; the upper positioning cover plate 110 and the lower positioning cover plate 120 are respectively connected to both ends of the inner ring 130 and both ends of the outer ring 140; the upper positioning cover plate 110 and the lower positioning cover plate 120 respectively abut against both ends of the stator winding 200; reinforcing plates 111 are provided on the sides of the upper positioning cover plate 110 and the lower positioning cover plate 120 that are close to each other, and the stator winding 200 is arranged between two adjacent reinforcing plates 111.

[0049] The stator unit provided by the present invention improves the strength of the upper positioning cover plate 110, the lower positioning cover plate 120 and the stator housing 100 by providing the reinforcing plates 111 on the sides of the upper positioning cover plate 110 and the lower positioning cover plate 120 that are close to each other, thereby preventing deformation, enabling the stator housing 100 to ensure the strength of the non-metallic housing without internal glue injection, avoiding coolant leakage caused by thermal deformation of the glue injection layer, and thus ensuring the protection performance and safety of the motor. In addition, the maintainability of the stator unit is also improved without glue injection. When some stator windings 200 are damaged, only the stator housing 100 needs to be opened and the damaged stator windings 200 are replaced. However, in the case of glue injection, since both ends of the stator winding 200 are inserted into the glue injection layer, once the stator winding 200 is damaged, it is difficult to repair and replace. The stator winding 200 is not easy to take out, the attached glue is not easy to clean, and it cannot be reassembled. If reassembled, the glue injection layer needs to be completely removed and re-injected, with extremely high costs.

[0050] The following will combine Figures 1-12 to describe in detail the structure and shape of the stator unit provided in this embodiment:

[0051] In an alternative embodiment of the present example, the stator unit includes a stator housing 100 and a stator winding 200. A plurality of stator windings 200 are annularly arrayed circumferentially within the stator housing 100 along the stator housing 100.

[0052] Specifically, the stator housing 100 includes an upper positioning cover plate 110, a lower positioning cover plate 120, an inner ring 130, an outer ring 140, and a lead tube 150. As Figure 2 , Figure 4 , Figure 5 shown, the inner ring 130 is inserted into the outer ring 140 and is coaxially arranged with the outer ring 140. The upper positioning cover plate 110 and the lower positioning cover plate 120 are respectively connected to both ends of the inner ring 130 and both ends of the outer ring 140, that is, the upper positioning cover plate 110, the lower positioning cover plate 120, the inner ring 130, and the outer ring 140 enclose an annular inner cavity. The upper positioning cover plate 110 and the lower positioning cover plate 120 respectively abut against both ends of the stator winding 200. The lead tube 150 is installed on the upper positioning cover plate 110 and communicates with the annular inner cavity of the stator housing 100, so as to facilitate the leads of the stator winding 200 to pass through the lead tube 150. The stator winding 200 includes a stator core 210 and a coil winding 220 sleeved on the stator core 210.

[0053] In this embodiment, on one side where the upper positioning cover plate 110 and the lower positioning cover plate 120 are close to each other, there are both rib plates 111 and positioning grooves 112. As Figure 6 , Figure 8 shown, a plurality of rib plates 111 and positioning grooves 112 are annularly and evenly distributed around the axes of the upper positioning cover plate 110 and the lower positioning cover plate 120. Among them, the rib plates 111 are arranged between two adjacent positioning grooves 112 and extend radially along the upper positioning cover plate 110 or the lower positioning cover plate 120, which is used to improve the strength of the upper positioning cover plate 110 and the lower positioning cover plate 120 and reliably separate adjacent stator windings 200; the upper and lower ends of the stator winding 200 are respectively clamped in the positioning grooves 112 of the upper positioning cover plate 110 and the lower positioning cover plate 120 to realize the position locking of the stator winding 200 in the stator housing 100, so that there is no need to use a positioning frame for limiting, reducing the gap between adjacent stator windings 200, improving the slot fill factor, and at the same time avoiding the induced current loss and eddy current loss generated by the metal positioning frame and the blockage of the coolant by the positioning frame, improving the motor efficiency and cooling effect.

[0054] Specifically, the upper and lower ends of the stator core 210 are respectively clamped in the positioning grooves 112 of the upper positioning cover plate 110 and the lower positioning cover plate 120; the coil windings 220 are arranged between two adjacent rib plates 111 and are in contact with the rib plates 111, so as to realize the limitation of the coil windings 220, effectively prevent short circuits from occurring between the coil windings 220 due to conduction, and maintain the winding state of the coil windings 220, preventing loosening due to factors such as vibration.

[0055] In this embodiment, for the convenience of installing the stator winding 200, circular grooves are provided at the four corners of the positioning groove 112, and the circular grooves communicate with the positioning groove 112, as Figure 8 shown. After assembly, the four corners of the stator core 210 are snapped into the circular grooves to avoid increasing the repair workload due to dimensional errors.

[0056] In this embodiment, the outer ring 140, the upper positioning cover plate 110, the lower positioning cover plate 120 and the stator winding 200 enclose a first annular flow channel 101; the inner ring 130, the upper positioning cover plate 110, the lower positioning cover plate 120 and the stator winding 200 enclose a second annular flow channel 102; the rib plates 111 of the upper positioning cover plate 110, the rib plates 111 of the lower positioning cover plate 120 and the stator winding 200 enclose a radial flow channel 103; one end of the radial flow channel 103 communicates with the first annular flow channel 101, and the other end communicates with the second annular flow channel 102, so that the first annular flow channel 101, the second annular flow channel 102 and the radial flow channel 103 form a cooling channel, as Figure 4 shown. The radial flow channel 103 formed between adjacent stator windings 200 avoids the risk of short circuit of the stator windings 200, improves the reliability and safety of the motor, and the setting of the rib plates 111 further improves the reliability of keeping the stator windings 200 spaced apart.

[0057] In this embodiment, cooling ports 104 are provided on the outer ring 140, and the two cooling ports 104 are evenly distributed around the axis of the outer ring 140 and communicate with the first annular flow channel 101 to serve as the outlet and inlet of the cooling channel.

[0058] In this embodiment, the positioning groove 112 is machined by a numerical control precision engraving machine to improve its accuracy and flatness, so as to ensure the precise positioning and reliable limitation of the stator winding 200, ensure the smoothness of the radial flow channel 103 and improve the reliability and structural strength of the motor.

[0059] In an alternative solution of this embodiment, the upper positioning cover plate 110 and the lower positioning cover plate 120 can be processed by integral injection molding, and the positioning groove 112 can be directly obtained by injection molding without mechanical processing.

[0060] In an alternative solution of this embodiment, the upper positioning cover plate 110, the lower positioning cover plate 120, the inner ring 130, the outer ring 140, and the lead pipe 150 are made of non-metallic materials to further reduce eddy current loss and induced current loss, such as glass fiber-reinforced PEEK composite materials with added glass fiber, carbon fiber-reinforced plastics, glass fiber-reinforced plastics, etc. Preferably, a glass fiber-reinforced PEEK composite material is selected, in which the content of glass fiber is 15% - 40%, so as to ensure that the stator housing 100 has sufficient strength, toughness, and high-temperature resistance. Specifically, this material can withstand a high temperature of 300 °C, thus ensuring the normal operation of the motor.

[0061] In this embodiment, both the upper positioning cover plate 110 and the lower positioning cover plate 120 are connected to the inner ring 130 and the outer ring 140 by screws, and the joints are sealed with sealant to ensure the sealing performance and avoid liquid leakage. In addition, the lower positioning cover plate 120 can also be integrally injection-molded with the inner ring 130 and the outer ring 140 to further improve the sealing performance. The upper positioning cover plate 110 is connected to the inner ring 130 and the outer ring 140 by screws, and the joints are sealed with sealant to ensure the sealing performance.

[0062] Specifically, as Figure 9 shown, cylindrical bosses 131 are evenly distributed in a ring on the outer wall of the inner ring 130, and first threaded holes 132 coaxial with the cylindrical bosses 131 are provided on the end face for screw connection with the upper positioning cover plate 110. Correspondingly, through holes corresponding to the first threaded holes 132 are provided on the upper positioning cover plate 110. The outer wall of the outer ring 140 is provided with a circumferentially arranged limit card slot 141, the inner wall of the outer ring 140 is circumferentially arranged with rectangular bosses 142 corresponding to the limit card slot 141, and second threaded holes 143 and third threaded holes 144 located on the rectangular bosses 142 are provided on the end face of the outer ring 140 for screw connection with the upper positioning cover plate 110, as Figure 10 shown. Correspondingly, through holes corresponding to the second threaded holes 143 and the third threaded holes 144 are provided on the upper positioning cover plate 110. In this embodiment, both the cylindrical bosses 131 and the rectangular bosses 142 are used to improve strength and stiffness; the limit card slot 141 is used to engage with the protrusions on the motor housing to prevent relative rotation between the stator housing 100 and the motor housing, thereby preventing the stator housing 100 from rotating when the rotor rotates and ensuring the normal operation of the motor. Specifically, the limit card slot 141 extends along the axial direction of the outer ring 140.

[0063] When the lower positioning cover plate 120 is connected to the inner ring 130 and the outer ring 140 by screws, through holes the same as those on the upper positioning cover plate 110 are provided thereon, and corresponding first threaded holes 132, second threaded holes 143, and third threaded holes 144 are provided at one end of the inner ring 130 and the outer ring 140 connected to the lower positioning cover plate 120.

[0064] In addition, through holes for installing the lead pipe 150 are also provided on the upper positioning cover plate 110. During assembly, a sealing ring is arranged in the inner hole of the lead pipe 150 to ensure the sealing performance when the lead is inserted, thereby ensuring the sealing performance of the annular inner cavity of the stator housing 100. In addition, an oil-resistant rubber hose can also be sleeved outside the lead pipe 150 and the lead. The end of the oil-resistant rubber hose sleeved on the lead pipe 150 is tightly sealed. After the outer joint of the lead is pressed tightly by a copper pipe with a plug in the middle and then inserted into the oil-resistant rubber hose, it is also tightly sealed. The other end of the copper pipe is directly crimped to the lead of the drive system to ensure the sealing performance of the annular inner cavity of the stator housing 100. In short, the copper pipe with a plug in the middle is used as an adapter. One end inserts the lead, and the other end inserts the lead of the drive system. The lead of the stator winding 200 is connected to the lead of the drive system by crimping. At this time, the liquid inside the stator housing 100 cannot flow out along the lead. At the same time, the copper pipe is inserted into the lead pipe 150, and an oil-resistant rubber hose is sleeved outside the lead pipe 150 and tightly sealed to block the gap between the lead pipe 150 and the copper pipe, thereby forming a seal.

[0065] In this embodiment, taking the height of the stator winding 200 as 100 mm as an example, the height of the rib plate 111 is set to 20 mm, and the height of the radial flow channel 103 is 60 mm. This height can not only ensure the strength of the stator housing 100 but also ensure the sufficient contact between the coolant and the stator winding 200, thereby ensuring the cooling and insulation effects.

[0066] The working process of the stator unit provided in this embodiment is as follows:

[0067] During operation, the two cooling ports 104 respectively serve as the oil inlet and the oil outlet for the coolant to flow in and out. The coolant enters from the oil inlet and flows through the first annular flow channel 101, the second annular flow channel 102, and the radial flow channel 103 to fully cool the stator winding 200 and then flows out from the oil outlet. Through the arrangement of the radial flow channel 103, the stator winding 200 is fully cooled, avoiding the situation where the temperature of the side of the stator winding 200 is too high while the temperatures at both ends close to the inner ring 130 and the outer ring 140 are relatively low, significantly improving the cooling effect and further enhancing the overload capacity of the motor.

[0068] Based on the stator unit provided in this embodiment, an axial-flux motor is proposed, which includes the above-mentioned stator unit and also includes a rotor unit. The two rotor units are coaxially arranged with the stator unit and are respectively arranged on both sides of the stator unit. Due to the cooling capacity and efficiency of the stator unit, the axial-flux motor provided in this embodiment can have an overload capacity of 150% and a relatively high energy efficiency of 98%, ensuring the starting safety and stability of the motor; at the same time, it can reduce the configuration cost of the motor. When the equipment occasionally requires a high power, but usually only requires a low power, if configured according to the high power, it will cause power waste and electric energy waste, increasing the motor cost. If configured according to the low power, it cannot meet the requirements. Configuring two motors with different powers and switching the motors through a transmission mechanism will greatly increase the equipment cost. However, the motor provided in this embodiment has a good overload capacity, enabling the motor to have a wide range of operating powers, which can meet the temporary high-power requirements, avoiding both the high cost of configuring a high-power motor and the high energy consumption of using a high-power motor, avoiding power waste, and achieving extremely high energy conservation and consumption reduction, which has important economic value for the energy conservation and consumption reduction of large equipment.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator unit, characterized in that: It comprises a stator housing (100) and a stator winding (200); a plurality of stator windings (200) are arranged in an annular array in the stator housing (100); The stator housing (100) comprises an upper positioning cover plate (110), a lower positioning cover plate (120), an inner ring (130) and an outer ring (140); The inner ring (130) is inserted into the outer ring (140) and is coaxially arranged with the outer ring (140); the upper positioning cover plate (110) and the lower positioning cover plate (120) are respectively connected to two ends of the inner ring (130) and two ends of the outer ring (140); The upper positioning cover plate (110) and the lower positioning cover plate (120) are respectively abutted against two ends of the stator winding (200); Rib plates (111) are provided on the sides of the upper positioning cover plate (110) and the lower positioning cover plate (120) that are close to each other, and the stator winding (200) is provided between two adjacent rib plates (111).

2. The stator unit according to claim 1, characterized in that: The upper positioning cover plate (110) and the lower positioning cover plate (120) are both provided with positioning grooves (112), and the rib plate (111) is provided between two adjacent positioning grooves (112); Two ends of the stator winding (200) are respectively clamped in the positioning grooves (112) of the upper positioning cover plate (110) and the lower positioning cover plate (120).

3. The stator unit according to claim 2, characterized in that: The rib plate (111) of the upper positioning cover plate (110) extends in the radial direction of the upper positioning cover plate (110); The rib plate (111) of the lower positioning cover plate (120) extends in the radial direction of the lower positioning cover plate (120).

4. The stator unit according to claim 3, characterized in that: The stator winding (200) comprises a stator core (210) and a coil winding (220) sleeved on the stator core (210); Two ends of the stator core (210) are respectively abutted against the upper positioning cover plate (110) and the lower positioning cover plate (120); The coil winding (220) is disposed between two adjacent rib plates (111) and is in contact with the rib plates (111).

5. The stator unit according to claim 1, characterized in that: The outer wall of the outer ring (140) is provided with a limit groove (141), and the limit groove (141) extends along the axial direction of the outer ring (140).

6. The stator unit according to claim 1, characterized in that: The stator housing (100) further comprises a lead tube (150), wherein the lead tube (150) is mounted on the upper positioning cover plate (110) and is in communication with the inner cavity of the stator housing (100).

7. The stator unit according to claim 1, characterized in that: The upper positioning cover plate (110), the lower positioning cover plate (120), the inner circular ring (130) and the outer circular ring (140) are made of glass fiber reinforced PEEK composite material.

8. The stator unit according to claim 1, characterized in that The outer ring (140), the upper positioning cover plate (110), the lower positioning cover plate (120) and the stator winding (200) form a first annular flow channel (101); The inner ring (130), the upper positioning cover plate (110), the lower positioning cover plate (120) and the stator winding (200) form a second annular flow channel (102); The rib plate (111) of the upper positioning cover plate (110), the rib plate (111) of the lower positioning cover plate (120), and the stator winding (200) form a radial flow channel (103); One end of the radial flow channel (103) is in communication with the first annular flow channel (101), and the other end is in communication with the second annular flow channel (102); the first annular flow channel (101), the second annular flow channel (102) and the radial flow channel (103) constitute a cooling channel; The outer ring (140) is provided with cooling ports (104), and the two cooling ports (104) are evenly distributed around the axis of the outer ring (140) and are in communication with the first annular flow channel (101).

9. The stator unit according to claim 1, characterized in that: The upper positioning cover plate (110) is connected to the inner ring (130) and the outer ring (140) by screws, and the joints are sealed by sealant; The lower positioning cover plate (120), the inner circular ring (130) and the outer circular ring (140) are integrally injection-molded or connected by screws, and the joints are sealed by using a sealant.

10. An axial flux motor, characterized in that: It comprises the stator unit according to any one of claims 1 to 9, and also comprises a rotor unit, wherein two rotor units are arranged on both sides of the stator unit and are coaxially arranged with the stator unit.

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