Electric motor and blower

Abstract

The utility model provides a kind of motor and air blower, motor includes shell structure, stator assembly, rotor assembly, rear shell structure and impeller, stator assembly is set in shell structure, rotor assembly passes through stator assembly, rear shell structure and the one end of shell structure are connected, impeller is installed in the one end of rotor assembly, and impeller is located in the air inlet cavity of rear shell structure;Wherein, rear shell structure has air inlet, rear shell passage, shell structure has shell passage, stator assembly has stator passage, air inlet cavity, air inlet, rear shell passage, shell passage and stator passage are sequentially communicated, and the flow area of rear shell passage<the flow area of shell passage<the flow area of stator passage.In the scheme, by gradually enlarging the flow area of cooling wind, it is realized that cooling wind changes from high pressure low speed to low pressure large flow, reaches the effect that cyclone reduces, flow resistance reduces, improves the heat exchange efficiency of cooling wind and motor, improves the cooling performance of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a motor and a blower. Background Technology

[0002] With the rapid development of industrial production, the electric motor industry continues to move towards higher speeds and smaller sizes. As motor power and speed continue to increase, the problem of motor overheating is becoming increasingly serious, limiting further improvements in motor performance. Motors generate heat during operation, primarily from copper losses in the copper wires and iron losses in the stator core. The most significant copper losses are concentrated in the stator windings. If the windings overheat severely, the insulation varnish on the wires can melt or spontaneously combust, exposing the copper wires to the air and causing a stator short circuit. Meanwhile, iron losses in the stator core can lead to excessively high rotor temperatures, causing demagnetization of the magnets and severely shortening the motor's lifespan.

[0003] In existing technologies, fan blades are often installed on the motor rotor, and the mechanical energy of the motor drives the impeller to rotate to generate natural wind for cooling. However, due to the large flow resistance of the cooling air ducts inside the motor, the cooling airflow is small and it is difficult to meet the cooling requirements of the motor. Utility Model Content

[0004] This invention provides an electric motor and a blower to solve the problem that the cooling channel resistance of the electric motor in the prior art is too large, making it difficult to meet the cooling requirements.

[0005] To address the aforementioned problems, according to one aspect of this utility model, a motor is provided, comprising a housing structure, a stator assembly, a rotor assembly, a rear housing structure, and an impeller. The stator assembly is disposed within the housing structure, the rotor assembly passes through the stator assembly, one end of the rear housing structure is connected to the housing structure, and the impeller is mounted on one end of the rotor assembly, with the impeller located within the air inlet chamber of the rear housing structure. The rear housing structure has an air inlet and a rear housing channel, the housing structure has a housing channel, and the stator assembly has a stator channel. The air inlet chamber, air inlet, rear housing channel, housing channel, and stator channel are sequentially connected, and the flow area of ​​the rear housing channel < the flow area of ​​the housing channel < the flow area of ​​the stator channel.

[0006] Furthermore, the outer casing structure has an air outlet channel that is connected to the outside of the motor, and the stator channel is connected to the air outlet channel through a cavity inside the outer casing structure; wherein, the flow area of ​​the air inlet is less than the flow area of ​​the rear casing channel, and the flow area of ​​the stator channel is less than the flow area of ​​the air outlet channel.

[0007] Furthermore, there are multiple rear shell channels, which are distributed circumferentially along the rear shell structure; there are multiple outer shell channels, which are distributed circumferentially along the outer shell structure; there are multiple stator channels, which are distributed circumferentially along the stator assembly; and each outer shell channel is respectively set with one rear shell channel and one stator channel.

[0008] Furthermore, the outer shell structure has an annular groove arranged circumferentially, and the outlet of the outer shell channel and the inlet of the stator channel are both connected to the annular groove; the annular groove has a guide surface, which guides the cooling air in the outer shell channel to the stator channel.

[0009] Furthermore, the outlet direction of the outer shell channel is the axial direction of the outer shell structure, and the outlet direction of the annular groove is the radial direction of the outer shell structure; in the axial direction of the outer shell structure, the cross-section of the guide surface has a first arc segment, a straight segment and a second arc segment connected in sequence.

[0010] Furthermore, the stator assembly has an annular channel arranged circumferentially, and the outlet of each stator channel is connected to the annular channel; in the axial direction of the stator assembly, the cross-section of the annular channel is an arc-shaped channel, and the outlet of the annular channel faces the end of the winding inside the stator assembly.

[0011] Furthermore, the stator assembly includes a cooling jacket, a stator core, and a winding wound around the stator core. The cooling jacket is fitted onto the stator core. The stator channel includes two branch channels arranged along the axial direction of the stator assembly within the cooling jacket. The inlets of the two branch channels are both located in the axial middle of the cooling jacket and are both connected to the outer casing channel. The two outlets of the two branch channels respectively deliver cooling air to both ends of the winding.

[0012] Furthermore, the stator assembly also includes a flow distribution structure disposed on the cooling jacket. The flow distribution structure has a wedge-shaped cross section along the axial direction of the stator assembly and has two opposing flow distribution surfaces. The two flow distribution surfaces divide the air output from the outer casing channel into two branch channels.

[0013] Furthermore, the outer shell structure has an annular groove arranged circumferentially, and the outlet of the outer shell channel and the inlet of the branch channel are both connected to the annular groove; the flow distribution structure is an annular structure, which surrounds the cooling jacket, with the tip of the flow distribution structure facing the annular groove, and the flow distribution surface is an arc surface.

[0014] Furthermore, the exhaust channels are arranged radially along the outer shell structure, and there are multiple exhaust channels distributed on both sides of the stator assembly along the axial direction.

[0015] Furthermore, the flow area of ​​the rear shell channel gradually increases in the conveying direction. The rear shell channel includes interconnected straight channels and curved channels. The straight channels are connected to the air inlet, and the curved channels are connected to the outer shell channel.

[0016] Furthermore, the motor also includes a rear bearing, and the housing structure includes an interconnected cylinder and a bearing housing. The rear bearing is installed between the rotor assembly and the bearing housing, and the housing channel passes through the bearing housing and enters the cylinder. The rear housing structure includes a rear housing and a shroud, both of which are connected to the bearing housing. The air intake chamber and the rear housing channel are both located between the rear housing and the shroud.

[0017] According to another aspect of the present invention, a blower is provided, which includes the aforementioned motor.

[0018] In this design, the air intake chamber, air inlet, rear shell channel, outer shell channel, and stator channel are sequentially connected, facilitating the entry of cooling air from the outside into the motor. The air then passes through the rear shell structure, outer shell structure, and stator assembly for centralized cooling. Furthermore, the flow area of ​​the rear shell channel is set to be less than that of the outer shell channel, which in turn is less than that of the stator channel. By gradually increasing the flow area of ​​the cooling air, the cooling air is transformed from high pressure and low speed to low pressure and high flow rate. This reduces air cyclone and flow resistance, improves the heat exchange efficiency between the cooling air and the motor, and enhances the motor's cooling performance. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 A cross-sectional view of the motor provided in an embodiment of the present invention is shown;

[0021] Figure 2 It shows Figure 1 A cross-sectional view of the motor structure at the housing channel;

[0022] Figure 3 It shows Figure 1 A side view of the rear housing structure of the motor;

[0023] Figure 4 It shows Figure 1 A side view of the housing structure in the motor;

[0024] Figure 5 It shows Figure 1 A magnified view of a portion of the stator channel in the motor.

[0025] The above figures include the following reference numerals:

[0026] 10. Outer shell structure; 11. Outer shell channel; 12. Exhaust channel; 13. Annular groove; 131. Guide surface; 1311. First arc segment; 1312. Straight segment; 1313. Second arc segment; 14. Cylinder body; 15. Bearing seat;

[0027] 20. Stator assembly; 21. Stator channel; 211. Branch channel; 22. Annular channel; 23. Cooling jacket; 24. Stator core; 25. Winding; 26. Flow splitting structure; 261. Flow splitting surface;

[0028] 30. Rotor assembly;

[0029] 40. Rear shell structure; 41. Air inlet; 42. Rear shell channel; 421. Straight channel; 422. Curved channel; 43. Air inlet chamber; 44. Rear shell; 45. Radiator;

[0030] 50. Impeller. Detailed Implementation

[0031] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0032] like Figures 1 to 5 As shown, an embodiment of this utility model provides a motor, including a housing structure 10, a stator assembly 20, a rotor assembly 30, a rear housing structure 40, and an impeller 50. The stator assembly 20 is disposed within the housing structure 10, the rotor assembly 30 passes through the stator assembly 20, the rear housing structure 40 is connected to one end of the housing structure 10, and the impeller 50 is installed at one end of the rotor assembly 30, and the impeller 50 is located within the air inlet chamber 43 of the rear housing structure 40. The rear housing structure 40 has an air inlet 41 and a rear housing channel 42, the housing structure 10 has a housing channel 11, and the stator assembly 20 has a stator channel 21. The air inlet chamber 43, the air inlet 41, the rear housing channel 42, the housing channel 11, and the stator channel 21 are sequentially connected, and the flow area of ​​the rear housing channel 42 is less than the flow area of ​​the housing channel 11 and the flow area of ​​the stator channel 21.

[0033] In this design, the air intake chamber 43, air inlet 41, rear shell channel 42, outer shell channel 11, and stator channel 21 are connected in sequence, facilitating the entry of cooling air from the outside into the motor. The air passes through the rear shell structure 40, outer shell structure 10, and stator assembly 20 in sequence for centralized cooling. Furthermore, the flow area of ​​the rear shell channel 42 is set to be less than the flow area of ​​the outer shell channel 11, which is less than the flow area of ​​the stator channel 21. By gradually increasing the flow area of ​​the cooling air, the cooling air is transformed from high pressure and low speed to low pressure and high flow rate, achieving the effects of reduced cyclone and reduced flow resistance. This improves the heat exchange efficiency between the cooling air and the motor, and enhances the cooling performance of the motor.

[0034] like Figure 1 As shown, the outer casing structure 10 has an air outlet channel 12, which is connected to the outside of the motor. The stator channel 21 is connected to the air outlet channel 12 through a cavity inside the outer casing structure 10. The flow area of ​​the air inlet 41 is less than the flow area of ​​the rear casing channel 42, and the flow area of ​​the stator channel 21 is less than the flow area of ​​the air outlet channel 12. The air outlet channel 12 facilitates the timely discharge of cooled air after cooling, preventing high-temperature cooling air from remaining inside the motor for extended periods and reducing cooling efficiency. The gradually decreasing cross-sectional area of ​​the cooling air flow channels, with the air inlet 41's flow area less than the rear casing channel 42's and the stator channel 21's flow area less than the air outlet channel 12, effectively reduces flow resistance and improves cooling efficiency.

[0035] In some embodiments, there are multiple rear housing channels 42 distributed circumferentially along the rear housing structure 40, multiple outer housing channels 11 distributed circumferentially along the outer housing structure 10, and multiple stator channels 21 distributed circumferentially along the stator assembly 20. Each outer housing channel 11 corresponds to one rear housing channel 42 and one stator channel 21. This multi-channel circumferential distribution design ensures that cooling air fully covers the entire circumference of the motor, and the two ends of the outer housing channel 11 are connected to the rear housing channel 42 and the stator channel 21 respectively. This arrangement improves the uniformity and efficiency of cooling, significantly reduces the overall temperature of the motor, and improves the motor's durability and efficiency.

[0036] like Figure 2 As shown, the outer casing structure 10 has an annular groove 13 arranged circumferentially. The outlet of the outer casing channel 11 and the inlet of the stator channel 21 are both connected to the annular groove 13. The annular groove 13 has a guide surface 131, which guides the cooling air in the outer casing channel 11 to the stator channel 21. The cooling air in the outer casing channel 11 enters the stator channel 21 through the annular groove 13. The guide surface 131 in the annular groove 13 acts as a buffer and guide for the cooling air, preventing the formation of cyclones.

[0037] In some embodiments, the outlet direction of the outer casing channel 11 is the axial direction of the outer casing structure 10, and the outlet direction of the annular groove 13 is the radial direction of the outer casing structure 10; in the axial direction of the outer casing structure 10, the cross-section of the guide surface 131 has a first arc segment 1311, a straight segment 1312, and a second arc segment 1313 connected in sequence, such as Figure 5 As shown, the annular groove is located at the bend of the flow channel. The cross-section of the guide surface 131 consists of straight and curved segments, which buffers and guides the cooling air, prevents the formation of cyclones, further reduces the flow resistance in the channel, and improves the cooling efficiency of the motor.

[0038] like Figure 2 As shown, the stator assembly 20 has an annular channel 22 arranged circumferentially, and the outlet of each stator channel 21 is connected to the annular channel 22. In the axial direction of the stator assembly 20, the cross-section of the annular channel 22 is an arc-shaped channel, and the outlet of the annular channel 22 faces the end of the winding 25 inside the stator assembly 20. The annular channel 22 delivers the cooling air in the stator channel 21 to the internal cavity of the motor, and its outlet faces the end of the winding 25. The winding 25 is a component in the motor with a serious heat generation problem. Centralized cooling of it can improve the heat dissipation effect and avoid motor damage. At the same time, the arc-shaped cross-section of the annular channel 22 further reduces the flow resistance in the channel and ensures the cooling efficiency of the motor.

[0039] like Figure 1 , Figure 2 As shown, the stator assembly 20 includes a cooling jacket 23, a stator core 24, and a winding 25 wound around the stator core 24. The cooling jacket 23 is fitted onto the stator core 24. The stator channel 21 includes two branch channels 211 arranged along the axial direction of the stator assembly 20 within the cooling jacket 23. The inlets of both branch channels 211 are located at the axial center of the cooling jacket 23 and are connected to the outer casing channel 11. The two outlets of the two branch channels 211 respectively deliver cooling air to both ends of the winding 25. The centralized cooling, achieved by having the inlets of both branch channels 211 located at the axial center of the cooling jacket 23 and the two outlets respectively delivering cooling air to both ends of the winding 25, improves the uniformity and efficiency of cooling and effectively reduces the internal temperature of the motor.

[0040] In some embodiments, the stator assembly 20 further includes a flow-diverting structure 26 disposed on the cooling jacket 23. The flow-diverting structure 26 has a wedge-shaped cross-section along the axial direction of the stator assembly 20 and has two opposing flow-diverting surfaces 261. The two flow-diverting surfaces 261 divert the air output from the housing channel 11 to two branch channels 211. The flow-diverting structure 26 uniformly distributes the air output from the housing channel 11, while the wedge-shaped cross-section effectively prevents the generation of cyclones, improves the cooling performance of the motor, and extends its service life.

[0041] like Figure 2As shown, the outer shell structure 10 has an annular groove 13 arranged circumferentially, and the outlet of the outer shell channel 11 and the inlet of the branch channel 211 are both connected to the annular groove 13. The flow splitting structure 26 is an annular structure, surrounding the cooling jacket 23, with the tip of the flow splitting structure 26 facing the annular groove 13, and the flow splitting surface 261 is an arc surface. The tip of the flow splitting structure 26 facing the annular groove 13 facilitates the splitting of the cooling air flowing out of the annular groove 13, improving the flow splitting efficiency and uniformity. The flow splitting surface 261 is set as an arc surface, which plays a buffering and guiding role for the cooling air, avoiding the generation of cyclones and thus increasing the flow resistance, thereby improving the cooling efficiency.

[0042] In some embodiments, the air outlet channels 12 are arranged radially along the housing structure 10, and there are multiple air outlet channels 12 distributed on both sides of the stator assembly 20 along the axial direction. Providing multiple air outlet channels 12 distributed on both sides of the stator assembly 20 allows the cooled air to be discharged from the motor in a timely manner after cooling, preventing the high-temperature cooled air from stagnating inside the motor for an extended period after heat exchange with the heat-generating components. This facilitates timely replenishment of cooling air and ensures the cooling efficiency of the motor.

[0043] In some embodiments, the flow area of ​​the rear housing channel 42 gradually increases in the conveying direction. The rear housing channel 42 includes a straight channel 421 and a curved channel 422 that are interconnected. The straight channel 421 is connected to the air inlet 41, and the curved channel 422 is connected to the outer housing channel 11. The coordinated arrangement of the straight channel 421 and the curved channel 422 enables the cooling air to smoothly enter the outer housing channel 11, reducing the flow resistance within the channel while providing guidance. The gradually increasing flow area of ​​the rear housing channel 42 in the conveying direction increases the flow rate of the cooling air and improves the heat exchange effect between the cooling air and the motor.

[0044] In some embodiments, the motor further includes a rear bearing. The housing structure 10 includes an interconnected cylindrical body 14 and a bearing housing 15. The rear bearing is installed between the rotor assembly 30 and the bearing housing 15. The housing channel 11 passes through the bearing housing 15 and extends into the cylindrical body 14. The rear housing structure 40 includes a rear housing 44 and a guide shroud 45. Both the rear housing 44 and the guide shroud 45 are connected to the bearing housing 15. The air intake chamber 43 and the rear housing channel 42 are both located between the rear housing 44 and the guide shroud 45. This structural design ensures a reasonable layout of the cooling system and mechanical structure inside the motor. The flow path of the cooling air inside the motor is optimized, which not only ensures the uniform distribution of the cooling air and improves the flow efficiency of the cooling air, reducing the operating temperature of the motor, but also guarantees the mechanical strength and stability of the motor and extends the service life of the motor.

[0045] This utility model provides a blower including the aforementioned motor. By applying an optimized cooling channel and a motor with reduced flow resistance to the blower, the overall heat dissipation performance of the blower is improved. The temperature of the motor during operation is effectively controlled, avoiding performance degradation and failure risks caused by overheating. This ensures the stability and reliability of the blower during high-speed operation, and improves the working efficiency and service life of the blower.

[0046] Cooling air is first drawn into the intake chamber 43 by the rotation of the impeller 50, and then enters the rear housing channel 42 through the intake port 41. In the rear housing channel 42, the cooling gas flows sequentially through the straight channel 421 and the curved channel 422. Due to the gradually increasing flow area, the cooling air flows more smoothly, reducing flow resistance. The cooling air then enters the branch channel 211 through the outer casing channel 11, where the splitting structure 26 evenly distributes the cooling air to both ends of the winding 25. In the stator assembly 20, the cooling air flows through the stator core 24 and the winding 25, carrying away heat, and finally exits through the exhaust channel 12. By optimizing the flow channel design, the resistance to gas flow is reduced, cooling efficiency is improved, and the stability and reliability of the motor during high-speed operation are ensured.

[0047] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0048] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0051] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0052] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0053] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. An electric motor, characterized in that, The system includes a housing structure (10), a stator assembly (20), a rotor assembly (30), a rear housing structure (40), and an impeller (50). The stator assembly (20) is disposed within the housing structure (10), the rotor assembly (30) passes through the stator assembly (20), the rear housing structure (40) is connected to one end of the housing structure (10), the impeller (50) is mounted on one end of the rotor assembly (30), and the impeller (50) is located within the air intake chamber (43) of the rear housing structure (40). The rear shell structure (40) has an air inlet (41) and a rear shell channel (42), the outer shell structure (10) has an outer shell channel (11), and the stator assembly (20) has a stator channel (21). The air inlet cavity (43), the air inlet (41), the rear shell channel (42), the outer shell channel (11), and the stator channel (21) are connected in sequence, and the flow area of ​​the rear shell channel (42) is less than the flow area of ​​the outer shell channel (11) and the flow area of ​​the stator channel (21).

2. The motor according to claim 1, characterized in that, The outer shell structure (10) has an air outlet channel (12), which is connected to the outside of the motor. The stator channel (21) is connected to the air outlet channel (12) through the cavity inside the outer shell structure (10). The flow area of ​​the air inlet (41) is less than the flow area of ​​the rear shell channel (42), and the flow area of ​​the stator channel (21) is less than the flow area of ​​the air outlet channel (12).

3. The motor according to claim 1, characterized in that, There are multiple rear shell channels (42), which are distributed circumferentially along the rear shell structure (40). There are multiple outer shell channels (11), which are distributed circumferentially along the outer shell structure (10). There are multiple stator channels (21), which are distributed circumferentially along the stator assembly (20). Each outer shell channel (11) is respectively provided with one rear shell channel (42) and one stator channel (21).

4. The motor according to claim 3, characterized in that, The outer shell structure (10) has an annular groove (13) arranged in the circumferential direction. The outlet of the outer shell channel (11) and the inlet of the stator channel (21) are both connected to the annular groove (13). The annular groove (13) has a guide surface (131) that guides the cooling air in the outer shell channel (11) to the stator channel (21).

5. The motor according to claim 4, characterized in that, The outlet direction of the outer shell channel (11) is the axial direction of the outer shell structure (10), and the outlet direction of the annular groove (13) is the radial direction of the outer shell structure (10); in the axial direction of the outer shell structure (10), the cross section of the guide surface (131) has a first arc segment (1311), a straight segment (1312) and a second arc segment (1313) connected in sequence.

6. The motor according to claim 3, characterized in that, The stator assembly (20) has an annular channel (22) arranged circumferentially, and the outlet of each stator channel (21) is connected to the annular channel (22); in the axial direction of the stator assembly (20), the cross section of the annular channel (22) is an arc-shaped channel, and the outlet of the annular channel (22) faces the end of the winding (25) in the stator assembly (20).

7. The motor according to claim 1, characterized in that, The stator assembly (20) includes a cooling sleeve (23), a stator core (24), and a winding (25) wound around the stator core (24). The cooling sleeve (23) is fitted onto the stator core (24). The stator channel (21) includes two branch channels (211) arranged along the axial direction of the stator assembly (20) within the cooling sleeve (23). The inlets of the two branch channels (211) are both located in the axial middle of the cooling sleeve (23) and are both connected to the outer casing channel (11). The two outlets of the two branch channels (211) respectively deliver cooling air to both ends of the winding (25).

8. The motor according to claim 7, characterized in that, The stator assembly (20) further includes a flow divider structure (26) disposed on the cooling jacket (23). The flow divider structure (26) has a wedge-shaped cross section along the axial direction of the stator assembly (20). The flow divider structure (26) has two opposing flow divider surfaces (261). The two flow divider surfaces (261) divide the air output from the outer casing channel (11) into two branch channels (211).

9. The motor according to claim 8, characterized in that, The outer shell structure (10) has an annular groove (13) arranged circumferentially. The outlet of the outer shell channel (11) and the inlet of the branch channel (211) are both connected to the annular groove (13). The diversion structure (26) is an annular structure. The diversion structure (26) surrounds the cooling jacket (23). The tip of the diversion structure (26) faces the annular groove (13). The diversion surface (261) is an arc surface.

10. The motor according to claim 2, characterized in that, The air outlet channel (12) is arranged radially along the outer shell structure (10), and there are multiple air outlet channels (12), which are distributed on both sides of the axial direction of the stator assembly (20).

11. The motor according to claim 1, characterized in that, The flow area of ​​the rear shell channel (42) gradually increases in the conveying direction. The rear shell channel (42) includes a straight channel (421) and a curved channel (422) that are connected to each other. The straight channel (421) is connected to the air inlet (41), and the curved channel (422) is connected to the outer shell channel (11).

12. The motor according to claim 1, characterized in that, The motor also includes a rear bearing. The outer shell structure (10) includes a cylindrical body (14) and a bearing housing (15) connected to each other. The rear bearing is installed between the rotor assembly (30) and the bearing housing (15). The outer shell channel (11) passes through the bearing housing (15) and enters the cylindrical body (14). The rear shell structure (40) includes a rear shell (44) and a flow guide (45). The rear shell (44) and the flow guide (45) are both connected to the bearing housing (15). The air intake chamber (43) and the rear shell channel (42) are both located between the rear shell (44) and the flow guide (45).

13. A blower, characterized in that, The blower includes the motor according to any one of claims 1 to 12.

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