Motor

Abstract

The present application relates to a motor, comprising: an air guide member having a plurality of first air ducts, the plurality of first air ducts forming an air guide area; a stator assembly having a plurality of stator teeth, wherein a second air duct is formed between every two adjacent stator teeth, the stator assembly is arranged on one side of the air guide member, and the plurality of second air ducts form a heat dissipation area; an air outlet member having a plurality of air outlet areas; a rotor having a rotating shaft, wherein the rotor is rotatably arranged in the stator assembly, one end of the rotating shaft extends from the stator assembly and passes through the air guide member, and the other end of the rotating shaft extends from the stator assembly and runs through the air outlet member; and a pre-tightening support assembly comprising a first pre-tightening unit and a second pre-tightening unit which are located on both sides of the stator assembly, wherein the first pre-tightening unit and the second pre-tightening unit are both connected to the rotating shaft, and form opposing force on the rotating shaft to stabilize the rotating shaft; the air guide area and the air outlet areas form the only air duct of the motor; and when the motor operates, an airflow generated after driving an impeller passes through the air guide area, then completely through the heat dissipation area, and is finally discharged from the air outlet areas.

Description

motor Technical Field

[0001] The present application relates to the technical field of motors, and more specifically, to a motor and a blowing device. Background Art

[0002] With the advancement of technology and the development of life, motors have become an essential power component for many electronic products. Take hair dryers, which have been in great demand in recent years, for example. As the source of wind power for hair dryers, the performance of the motor also largely determines the performance of the hair dryer.

[0003] However, existing motor products often fail to balance requirements for size, wind speed, and heat dissipation. For example, while maintaining the same motor size, wind speed and heat dissipation often fail to meet product requirements. To meet product performance requirements, designers often choose larger motors, which in turn increases the overall size of the product. Therefore, it is imperative to design a motor that balances these multiple requirements.

[0004] Summary of the Invention

[0005] The embodiment of the present application provides a motor, comprising: an air guide member having a center frame and a plurality of air guide blades, the plurality of air guide blades being sequentially spaced apart on the outer periphery of the center frame, a first air duct being formed between each two adjacent air guide blades, and a plurality of the first air ducts forming an air guide area; a stator assembly having a stator yoke and a plurality of stator teeth, the stator teeth being connected to the inner peripheral wall of the stator yoke and sequentially spaced apart along the circumference of the stator yoke, a second air duct being formed between each two adjacent stator teeth, the stator assembly being arranged on one side of the air guide member, and a plurality of the second air ducts forming a heat dissipation area; a housing having a through hole extending along the axial direction of the motor accommodating cavity, the stator assembly and the air guide member are completely accommodated in the shell; an air outlet member is provided at one end of the stator assembly facing away from the air guide member and is connected to the shell, and the air outlet member has a plurality of air outlet areas; a rotor has a rotating shaft, and the rotor is rotatably arranged in the stator assembly, one end of the rotating shaft extends from the stator assembly and passes through the air guide member, and the other end of the rotating shaft extends from the stator assembly and passes through the air outlet member; a pre-tightening support assembly includes a first pre-tightening unit and a second pre-tightening unit located on both sides of the stator assembly, the first pre-tightening unit and the second pre-tightening unit are both connected to the rotating shaft and form opposite forces on the rotating shaft to stabilize the rotating shaft; an impeller is provided on the side of the air guide member facing away from the stator assembly, the ratio of the maximum diameter between the inner walls of the stator yoke to the maximum outer diameter of the impeller is between 0.8-1.2, one end of the rotating shaft passes through the air guide member and is connected to the impeller;

[0006] The air guide area, the air guide area and the air outlet area form the only air duct of the motor. When the motor is running, the air flow generated after driving the impeller passes through the air guide area, then completely passes through the heat dissipation area, and is discharged from the air outlet area.

[0007] Furthermore, the first pre-tightening unit and the air outlet member are located on the same side of the stator assembly. The first pre-tightening unit includes an elastic member and a first bearing. The first bearing is provided on the rotating shaft. One end of the elastic member abuts against the air outlet member, and the other end abuts against the first bearing.

[0008] Furthermore, the first bearing includes an inner ring portion, an outer ring portion, and balls arranged between the inner ring portion and the outer ring portion, the inner ring portion is fixed on the rotating shaft, and one end of the elastic member abuts against the outer ring portion of the first bearing.

[0009] Furthermore, the air outlet member includes a center seat, the air outlet area is located outside the outer peripheral wall of the center seat, and a receiving groove is provided on a side of the center seat facing the stator assembly, and the elastic member is received in the receiving groove.

[0010] Furthermore, the air outlet member also includes an outer shell and a plurality of support plates connected between the outer shell and the center seat. The outer shell is connected to the shell, and the plurality of support plates are arranged in sequence along the circumference of the center seat. An air outlet is formed between each two adjacent support plates, and the plurality of air outlets form the air outlet area.

[0011] Furthermore, the second pre-tightening unit and the air guide are located on the same side of the stator assembly, and the second pre-tightening unit includes a second bearing provided on the rotating shaft, and the side of the second bearing away from the stator assembly abuts against the air guide.

[0012] Furthermore, the second preload unit further includes a third bearing, which is located on a side of the second bearing facing the stator assembly. The third bearing and the second bearing are arranged in parallel and adjacent to each other along the axial direction of the rotating shaft.

[0013] Furthermore, a receiving groove is formed on a side of the center frame facing the stator assembly, and the second bearing and the third bearing are both located in the receiving groove.

[0014] Furthermore, the stator assembly also includes a plurality of stator windings, which are wound one-to-one on the stator teeth, and the cross-sectional area of ​​the stator teeth after the stator windings are wound is less than or equal to half of the cross-sectional area of ​​the air duct formed between two adjacent stator teeth after the stator windings are wound.

[0015] Furthermore, the air outlet member includes a center seat, an outer shell, and a plurality of support plates connected between the outer shell and the center seat, and each two adjacent support plates form an air outlet. The number of stator teeth is 6, the number of air guide plates is between 6 and 12, and the number of support plates is between 2 and 6.

[0016] When the motor is running, due to the structural characteristics of the impeller, the airflow generated by the impeller is not vertical to the inside of the motor, but has a certain rotation and a certain inclination angle; for the airflow with an inclination angle, if it is not corrected, vortexes will be generated and wasted, so the airflow passes through the wind guide area (composed of multiple first air ducts 13) composed of multiple wind guide blades with specific inclination angles. The wind guide area can guide the direction of the airflow generated by the impeller to transform it into a direction parallel to the axial direction of the rotating shaft, so that the airflow blows vertically to the second air duct (i.e., the heat dissipation area), that is, after all the airflow passes through the wind guide area, it all passes through the heat dissipation area and then blows out from the air outlet area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] FIG1 shows a three-dimensional schematic diagram of a motor provided in an embodiment of the present application.

[0019] FIG. 2 shows an exploded schematic diagram of the motor shown in FIG. 1 .

[0020] FIG3 shows an exploded schematic diagram of the motor shown in FIG1 in another direction.

[0021] FIG. 4 shows a schematic cross-sectional view of the motor shown in FIG. 1 in one direction.

[0022] FIG5 shows a schematic top view of the impeller and the second air duct of the stator assembly of the motor of the present application.

[0023] FIG6 shows a schematic top view of the first air duct and the air outlet area of ​​the air guide of the motor of the present application.

[0024] FIG7 shows a schematic cross-sectional view of a stator of the motor of the present application. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only used to simplify the description for the convenience of describing this application, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0027] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; or mere surface contact. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] The motor and air-drying equipment proposed in this application will be further explained below in conjunction with specific implementation methods and drawings.

[0029] 1 to 5 , an embodiment of the present application provides a motor 100, comprising an air guide 10, a stator assembly 20, a housing 30, an air outlet 40, a rotor 50, a preload support assembly, and an impeller 70; wherein the air guide 10 has a center frame 11 and a plurality of air guide vanes 12, the center frame 11 is roughly cylindrical, and the plurality of air guide vanes 12 are sequentially spaced on the outer periphery of the center frame 11, and a first air duct 13 is formed between each two adjacent air guide vanes 12, and the plurality of first air ducts 13 form an air guide area of ​​the motor 100; the stator assembly 20 has a stator yoke 21 and a plurality of stator teeth 22, the stator teeth 22 are connected to the inner peripheral wall of the stator yoke 21, and are sequentially spaced along the circumference of the stator yoke 21, and each two adjacent stator teeth 22 are spaced apart. A second air duct 23 is formed between the motor 22, the stator assembly 20 is arranged on one side of the air guide 10, and multiple second air ducts 23 form a heat dissipation area; the housing 30 has a receiving cavity 31 that penetrates along the axial direction of the motor, and the stator assembly 20 and the air guide 10 are completely accommodated in the housing 30; the air outlet member 40 is provided at one end of the stator assembly 20 away from the air guide 10 and is connected to the housing 30, and the air outlet member 40 has multiple air outlet areas 41; the rotor 50 has a rotating shaft 51, and the rotor 50 is rotatably arranged in the stator assembly 20, one end of the rotating shaft 51 extends from the stator assembly 20 and passes through the air guide 10, and the other end of the rotating shaft 51 extends from the stator assembly 20 to a position surrounded by the air outlet member 40; the pre-tightening support assembly includes a pre-tightening support assembly located at the stator assembly 20 The first pre-tightening unit 61 and the second pre-tightening unit 62 on both sides are connected to the rotating shaft 51 and form opposite forces on the rotating shaft 51 to stabilize the rotating shaft 51; the impeller 70 is arranged on the side of the air guide 10 away from the stator assembly 20, and the ratio d2 of the maximum diameter d1 between the inner walls of the stator yoke 21 and the maximum outer diameter of the impeller 70 is between 0.8 and 1.2. One end of the rotating shaft 51 passes through the air guide 10 and is connected to the impeller 70; the air guide area, the heat dissipation area and the air outlet area form the only air duct of the motor 100. When the motor 100 is running, the air flow generated after driving the impeller 70 passes through the air guide area, then completely passes through the heat dissipation area, and is discharged from the air outlet area.

[0030] During operation of the motor 100 of the present application, the rotating shaft 51 rotates relative to the stator assembly 20 due to the interaction between the rotor 50 and the stator assembly 20, thereby driving the impeller 70 to rotate. The rotation of the impeller 70 generates airflow from the outside of the motor into the interior of the motor. This airflow is guided through the air guide area formed by the plurality of first air ducts 13 and then blown toward the stator assembly 20. The airflow then flows through the heat dissipation area formed by the plurality of second air ducts 23, dissipating the heat generated by the stator assembly 20 toward the air outlet member 40, where it is dissipated from the air outlet area of ​​the air outlet member 40. By setting the ratio of the maximum diameter of the inner wall of the stator yoke 21 to the maximum outer diameter of the impeller 70 between 0.8 and 1.2, that is, ensuring that the diameter of the outermost edge of the second air duct 23 is comparable to that of the impeller while the size of the motor housing 30 remains unchanged, the airflow generated by the impeller 70 is completely blown toward the heat dissipation area after passing through the air guide area, thereby maintaining smooth airflow as much as possible and minimizing wind waste. This helps improve the heat dissipation effect of the motor and effectively increases the power of the motor.

[0031] In one embodiment, the air guide blades 12 are at least partially inclined on the outer peripheral wall of the center frame 11 relative to the axial direction of the center frame 11, that is, the air guide blades 12 have a specific inclination angle relative to the outer peripheral wall of the center frame. The inclination angle is related to the airflow direction generated by the impeller 70, so that the airflow can easily enter the first air duct 13 and can enter the second air duct vertically from the first air duct 13.

[0032] When the motor is running, due to the structural characteristics of the impeller, the airflow generated by the impeller 70 is not vertical to the inside of the motor, but has a certain rotation and a certain inclination angle; for the airflow with an inclination angle, if it is not corrected, vortexes will be generated and wasted, so the airflow passes through the wind guide area (composed of multiple first air ducts 13) composed of multiple wind guide blades 212 inclined at a specific angle. The wind guide area can guide the direction of the airflow generated by the impeller to transform it into a direction parallel to the axial direction of the rotating shaft, so that the airflow blows vertically to multiple second air ducts (i.e., heat dissipation areas). That is, after all the airflow passes through the wind guide area, it all passes through the heat dissipation area and then blows out from the air outlet area.

[0033] In one embodiment, the air guide member 10 and the shell 30 are an integrally formed structure, and the end of the air guide plate 12 of the air outlet member 40 away from the center frame 11 is connected to the inner wall of the shell 30, that is, the air guide plate 12 is connected between the shell 30 and the center frame 11.

[0034] Furthermore, the shell 30 is roughly cylindrical, and the inner wall of the shell 30 at one end away from the air guide member 10 is provided with a plurality of spaced positioning grooves 33 along the axial direction of the shell 30. The outer peripheral wall of the stator yoke 21 of the stator assembly 20 is provided with a plurality of positioning protrusions 24 corresponding to the positioning grooves 33 along the axial direction of the rotor 50. The length of the positioning groove 33 is equivalent to the axial length of the positioning protrusion 24 and the motor assembly 20. The stator assembly 20 is positioned inside the shell 30 by the nested cooperation of the positioning protrusion 24 and the positioning groove 33.

[0035] In one embodiment, the first preload unit 61 and the air outlet member 40 are located on the same side of the stator assembly 20. The first preload unit 61 includes an elastic member 611 and a first bearing 612. The first bearing 612 is sleeved on the rotating shaft 51. One end of the elastic member 611 abuts against the air outlet member 40, and the other end abuts against the first bearing 612. By abutting one end of the elastic member 611 against the air outlet member 40 connected to the housing 30, the elastic member 611 applies a thrust toward the first bearing 612 and the rotating shaft 51 toward the second preload unit 62. The end of the second preload unit 62 facing away from the first preload unit 61 is abutted. After the first preload unit 61 applies a thrust toward the second preload unit 62 to the rotating shaft 51, the second preload unit 62 can apply a force toward the first preload unit 61 to the rotating shaft 51, making the rotation of the rotating shaft 51 more stable and reliable, thereby improving the stability of the motor operation.

[0036] In this embodiment, the first bearing 612 includes an inner ring, an outer ring, and balls disposed between the inner and outer rings. The inner ring is fixed to the rotating shaft 51, and one end of the elastic member 611 abuts against the outer ring of the first bearing 612. Because the inner and outer rings of the first bearing 612 can rotate relative to each other directly via the balls, the abutment of the elastic member 611 against the outer ring provides a thrust toward the second preload unit 62 on the inner ring and the rotating shaft 51, further improving the stability of the rotating shaft 51.

[0037] The second preload unit 62 and the air guide 10 are located on the same side of the stator assembly 20. The second preload unit 62 includes a second bearing 621 provided on the rotating shaft 51. The side of the second bearing 621 facing away from the stator assembly 20 abuts against the air guide 10. When the first preload unit 61 applies a thrust to the rotating shaft 51 and the second bearing 621, the second preload unit 62, under the abutment of the air guide 10, will feedback a force in the opposite direction to the first warning unit 61, thereby making the rotating shaft 51 operate more stably under the action of these two opposing forces.

[0038] Furthermore, the second preload unit 62 also includes a third bearing 622, which is located on the side of the second bearing 621 facing the stator assembly 20. The third bearing 622 and the second bearing 621 are arranged axially parallel and adjacent to each other along the shaft 51. By providing two parallel bearings, the shaft 51 is preloaded while more bearings are used to support the shaft 51, thereby increasing the stability of the motor, reducing noise, and extending the service life of the motor 100.

[0039] It should be noted that the second pre-tightening unit 62 is not limited to the above structure, and may also adopt the same structure as the first pre-tightening unit 61 , that is, adopting a matching method of an elastic member and a bearing.

[0040] In one embodiment, a receiving groove 110 is defined on the side of the center frame 11 facing the stator assembly 20. The second bearing 621 and the third bearing 622 are both located within the receiving groove 110, further enhancing stability. The second bearing 621 is disposed at the bottom of the receiving groove 110 and contacts the bottom of the receiving groove 110.

[0041] In this embodiment, the air outlet member 40 includes a center seat 42, and the air outlet area 41 is located outside the outer peripheral wall of the center seat 42. A receiving groove 421 is opened on the side of the center seat 42 facing the stator assembly, and the elastic member 611 is received in the receiving groove 421, so that one end of the elastic member 611 can be firmly supported on the air outlet member 40.

[0042] Furthermore, the air outlet member 40 also includes a housing 43 and a plurality of support pieces 45 connected between the housing 43 and the center seat 42. The housing 43 is connected to the shell 30. The plurality of support pieces 45 are sequentially spaced along the circumference of the center seat 42. An air outlet is formed between each two adjacent support pieces 45. The plurality of air outlets form the air outlet area 41. The support pieces 45 can be spaced apart on the center seat 42 at equal intervals, and the direction in which the support pieces 45 extend from the center seat 42 to the housing 43 is perpendicular to the axial direction of the rotating shaft 51. This allows the airflow toward the air outlet area 41 to be more quickly discharged without adding a burden to the discharge of the airflow.

[0043] The connection method between the shell 43 and the housing 30 is not limited in this application, and can be, for example, threaded connection, snap connection, etc.

[0044] In this embodiment, the impeller 70 includes a hub 72 and a plurality of blades 74. The hub 72 is disposed on a side of the center frame 11 away from the stator assembly 20. One end of the rotating shaft 51 passes through the center frame 11 and is fixedly connected to the hub 72. The maximum outer diameter of the hub 72 is comparable to the maximum outer diameter of the center frame 11, that is, the hub 72 and the center frame 11 substantially overlap in the axial direction of the motor. In some embodiments, a groove is defined on the side of the hub 72 facing the center frame 11. The groove can accommodate a portion of the center frame 11, thereby reducing the gap between the impeller 70 and the air guide 10, thereby reducing the overall volume of the motor 100.

[0045] The blades 74 are sheet-like structures with curved surfaces. Multiple blades 74 are sequentially distributed outside the hub 72. This application does not impose a specific limit on the number of blades 74; the number can be set based on actual needs. In the axial direction of the motor 100, the blades 74 do not overlap or only overlap minimally with the center frame 11. This prevents the airflow generated by the blades 74 from entering through the space where the center frame 11 passes through the rotating shaft 51, thus preventing airflow dispersion and improving the heat dissipation efficiency of the motor.

[0046] Referring to Figures 5 and 6, in this embodiment, the number of stator teeth 22 is 6, the number of air guide blades 12 is between 6 and 12, and the number of support blades 45 is between 2 and 6. By setting the ratio of the number of air guide blades 12 to the number of stator teeth 22 between 1 and 2, the airflow generated by the impeller 70 can be effectively and maximally directed from the air guide area formed by the air guide blades 12 to the heat dissipation area of ​​the stator teeth 22, thereby improving the heat dissipation efficiency of the stator assembly 20. Furthermore, by setting the ratio of the number of stator teeth to the number of support blades 45 between 1 and 3, the airflow after passing through the heat dissipation area can be maximized and discharged from the air outlet 40 to the motor without affecting the stability of the air outlet 40.

[0047] As shown in FIG7 , the stator assembly 20 further includes a plurality of stator windings 25, each wound one-to-one around the stator teeth 22. The cross-sectional area A of each stator tooth 22 after the stator windings 25 are wound is less than or equal to one-half the cross-sectional area B of the air duct formed between two adjacent stator teeth 22 after the stator windings 25 are wound. Cross-sectional area A refers to the cross-sectional area of ​​a stator tooth 22 after a stator winding 25 is wound around it, and cross-sectional area B refers to the cross-sectional area of ​​a single air duct (ventilation portion). This arrangement maintains the smoothness of the air duct as much as possible while maintaining the maximum heat dissipation area of ​​the stator windings. This allows the stator assembly to maximize the size of the air duct within a reasonable space, thereby improving heat dissipation efficiency.

[0048] In traditional axial fans or motors, the airflow only passes through the periphery of the stator assembly and the silicon steel sheets inside the stator assembly to achieve heat conduction. Therefore, when the motor is working, the stator winding is the source of heat, which is then conducted to the silicon steel sheets. Although the silicon steel sheets themselves also generate a certain amount of heat, it is not the main source of heat. The main source of heat is the stator winding. The heat of the stator winding is conducted to the silicon steel sheets, and the heat of the silicon steel sheets is conducted to the outer metal shell. Then the wind in the air duct can only cool the outer metal shell. Therefore, the traditional heat reduction route has to pass through several layers to complete the heat dissipation, and the heat dissipation efficiency is very low. In the design of this application, the airflow directly passes through the stator winding of the stator assembly. The first source of heat generation is the stator winding on the stator assembly. Because the stator winding is directly exposed to the air duct in the heat dissipation area, its heat dissipation efficiency is much higher than that of traditional axial fans. This means that the stator winding can carry larger currents and power and can also be maintained within an operating temperature range.

[0049] The present application also provides a hair dryer, and the motor 100 can be applied to the hair dryer, and the motor 100 can drive other structures in the hair dryer to realize the normal operation of the hair dryer. In this embodiment, the type of the hair dryer is not limited, for example, it can be a hair dryer, a dryer, etc.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor, characterized in that: The motor comprises: An air guide member comprises a central frame and a plurality of air guide blades, wherein the plurality of air guide blades are sequentially and spaced apart on the periphery of the central frame, a first air duct is formed between each two adjacent air guide blades, and the plurality of first air ducts form an air guide area; A stator assembly comprising a stator yoke and a plurality of stator teeth, wherein the stator teeth are connected to the inner circumferential wall of the stator yoke and are sequentially spaced apart along the circumference of the stator yoke, with a second air duct formed between each two adjacent stator teeth. The stator assembly is disposed on one side of the air guide, and the plurality of second air ducts form a heat dissipation area. A housing having an accommodating cavity extending axially through the motor, wherein the stator assembly and the air guide are completely accommodated in the housing; An air outlet member is provided at one end of the stator assembly away from the air guide member and is connected to the housing, the air outlet member having an air outlet area; a rotor having a rotating shaft, the rotor being rotatably disposed in the stator assembly, one end of the rotating shaft extending from the stator assembly and passing through the air guide member, and the other end of the rotating shaft extending from the stator assembly and passing through the air outlet member; a pre-tightening support assembly, comprising a first pre-tightening unit and a second pre-tightening unit located on both sides of the stator assembly, wherein the first pre-tightening unit and the second pre-tightening unit are both connected to the rotating shaft and exert opposite forces on the rotating shaft to stabilize the rotating shaft; an impeller disposed on a side of the air guide facing away from the stator assembly, wherein a ratio of a maximum diameter between inner walls of the stator yoke and a maximum outer diameter of the impeller is between 0.8 and 1.2, and one end of the rotating shaft passes through the air guide and is connected to the impeller; The air guide area, the heat dissipation area and the air outlet area form a unique air duct of the motor. When the motor is running, the airflow generated after driving the impeller passes through the air guide area, then completely passes through the heat dissipation area, and is discharged from the air outlet area.

2. The motor according to claim 1, wherein: The first pre-tightening unit and the air outlet member are located on the same side of the stator assembly. The first pre-tightening unit includes an elastic member and a first bearing. The first bearing is provided on the rotating shaft. One end of the elastic member abuts against the air outlet member, and the other end abuts against the first bearing.

3. The motor according to claim 2, wherein: The first bearing includes an inner ring portion, an outer ring portion, and balls arranged between the inner ring portion and the outer ring portion. The inner ring portion is fixed on the rotating shaft, and one end of the elastic member abuts against the outer ring portion of the first bearing.

4. The motor according to claim 2, wherein: The air outlet member includes a central seat, the air outlet area is located outside the outer peripheral wall of the central seat, and a receiving groove is formed on a side of the central seat facing the stator assembly, and the elastic member is received in the receiving groove.

5. The motor according to claim 4, wherein: The air outlet member also includes an outer shell and a plurality of support plates connected between the outer shell and the center seat. The outer shell is connected to the shell. The plurality of support plates are arranged in sequence along the circumference of the center seat. An air outlet is formed between each two adjacent support plates. The plurality of air outlets form the air outlet area.

6. The motor according to claim 2, wherein: The second pre-tightening unit and the air guide are located on the same side of the stator assembly. The second pre-tightening unit includes a second bearing provided on the rotating shaft. The side of the second bearing away from the stator assembly abuts against the air guide.

7. The motor according to claim 6, wherein: The second preload unit further includes a third bearing, which is located on a side of the second bearing facing the stator assembly. The third bearing and the second bearing are arranged in parallel and adjacent to each other along the axial direction of the rotating shaft.

8. The motor according to claim 7, wherein: A receiving groove is provided on a side of the center frame facing the stator assembly, and the second bearing and the third bearing are both located in the receiving groove.

9. The motor according to claim 1, wherein: The stator assembly also includes a plurality of stator windings, which are wound one-to-one on the stator teeth. The cross-sectional area of the stator teeth after the stator windings are wound is less than or equal to half of the cross-sectional area of the air duct formed between two adjacent stator teeth after the stator windings are wound.

10. The motor according to claim 1, wherein: The air outlet member includes a center seat, an outer shell, and a plurality of support plates connected between the outer shell and the center seat. Every two adjacent support plates form an air outlet. The number of stator teeth is 6, the number of air guide plates is between 6 and 12, and the number of support plates is between 2 and 6.

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