Motor and heating and ventilation equipment

Abstract

The utility model discloses a motor and heating and ventilation equipment, the motor comprises a stator assembly and a rotor assembly, the stator assembly is configured to drive the rotor assembly to rotate, one of the stator assembly and the rotor assembly comprises a first part, and the other one comprises a second part, at least part of the first part is arranged on the outer side of the second part in the radial direction of the motor; the first part comprises a first main body part and a first step part, the first main body part and the first step part are arranged in the axis direction of the motor, and the outer peripheral surface of the first step part protrudes outwards in the radial direction from the outer peripheral surface of the first main body part. According to the motor provided by the embodiment of the utility model, the first main body part and the first step part are arranged on the outer peripheral surface, and the outer peripheral surface of the first step part protrudes out of the first main body part, so that dust falling along the circumferential direction can fall on the first step part, and part of dust can be remained on the first step part; the dustproof effect of the motor can be achieved on the premise that the cost is low and the heat dissipation performance of the motor is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive, in particular to a motor and a HVAC device comprising the motor. Background Art

[0002] The motor is mainly composed of a rotor and a stator. After assembly, a certain gap will be formed between the two. During long-term use, some dust may enter the motor through the gap, causing abnormal motor noise and even shortening the life of the motor. Therefore, in daily applications, it is necessary to consider the dustproof effect of the motor to avoid the above situation. In the related art, some motors use a sealing structure for dustproofing, but this structure is complex, costly, and may affect the heat dissipation performance of the motor. Utility Model Content

[0003] One purpose of the utility model is to provide a motor, on the outer peripheral surface of which a first main body portion and a first step portion are arranged, and the outer peripheral surface of the first step portion protrudes from the first main body portion, so that dust falling along the circumferential direction will fall on the first step portion, so that part of the dust can be left on the first step portion, and the dust-proof effect of the motor can be achieved at a lower cost and without affecting the heat dissipation performance of the motor.

[0004] Another object of the present invention is to provide a HVAC device, which includes the aforementioned motor.

[0005] According to the motor of the embodiment of the utility model, the motor includes a stator assembly and a rotor assembly, the stator assembly is configured to drive the rotor assembly to rotate, one of the stator assembly and the rotor assembly includes a first part, and the other includes a second part, at least part of the first part is arranged on the outside of the second part in the radial direction of the motor; the first part includes a first main body and a first step part, the first main body and the first step part are arranged along the axial direction of the motor, and the outer peripheral surface of the first step part protrudes outward from the outer peripheral surface of the first main body along the radial direction.

[0006] According to the motor of the embodiment of the utility model, a first main body portion and a first step portion are arranged on the outer peripheral surface, and the outer peripheral surface of the first step portion protrudes from the first main body portion. Dust falling along the circumferential direction will fall on the first step portion, so that part of the dust can be retained on the first step portion, and the dust-proof effect of the motor can be achieved at a relatively low cost and without affecting the heat dissipation performance of the motor.

[0007] In addition, the motor according to the above embodiment of the utility model may also have the following additional technical features:

[0008] In some embodiments, the rotor assembly includes a rotor shaft having a connecting end extending out of the first portion along the axial direction, and the first main body portion is closer to the connecting end than the first step portion in the axial direction.

[0009] In some embodiments, the outer peripheral surface of the first main body has a first end and a second end opposite to each other along the axial direction, the first end of the first main body extends to connect with the end surface of the first part, and the second end of the first main body extends to connect with the first step part.

[0010] In some embodiments, the outer peripheral surface of the first main body is configured as an inclined surface that gradually expands outward from the first end to the second end.

[0011] In some embodiments, the second part includes a second main body portion and a second step portion, the second main body portion is arranged radially inside the first main body portion, the second step portion is connected to the second main body portion along the axial direction and extends radially outward from the outer peripheral surface of the second main body portion, the second step portion is opposite to the first step portion along the axial direction and has a gap, and the first step portion is arranged between the second step portion and the first main body portion along the axial direction.

[0012] In some embodiments, the stator assembly includes the first part and a rotor shaft, the first part is connected to the rotor shaft and surrounds the rotor shaft, the stator assembly includes the second part, the second part has a mounting hole, and the rotor shaft is rotatably inserted into the mounting hole.

[0013] In some embodiments, the outer circumferential surface of the first main body portion and the outer circumferential surface of the first step portion are connected along the axial direction; or, the outer circumferential surface of the first main body portion and the outer circumferential surface of the first step portion are configured to form a step structure.

[0014] In some embodiments, the groove is provided on the outer circumferential surface of the first portion, and the opening of the groove faces a direction away from the first step portion.

[0015] In some embodiments, in the projection along the axial direction, the opening of the groove has an inner peripheral edge and an outer peripheral edge surrounding the motor axis, the outer peripheral edge is located radially outside the inner peripheral edge and outside the outer peripheral surface of the first main body, and the inner peripheral edge is located outside the outer peripheral surface of the first main body, flush with the edge of the outer peripheral surface of the first main body, or inside the edge of the outer peripheral surface of the first main body.

[0016] The HVAC equipment according to the embodiment of the utility model comprises the aforementioned motor and wind wheel, wherein the wind wheel is connected to the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a motor according to an embodiment of the utility model.

[0018] Figure 2 It is a cross-sectional view of a motor according to an embodiment of the utility model.

[0019] Figure 3 yes Figure 2 A partial enlarged schematic diagram of the area A in the middle circle.

[0020] Figure 4 It is a partially enlarged schematic diagram of a cross-sectional view of a motor according to another embodiment of the utility model.

[0021] Figure 5 It is a partially enlarged schematic diagram of a cross-sectional view of a motor according to yet another embodiment of the utility model.

[0022] Figure 6 It is a schematic diagram of a rotor assembly of a motor according to an embodiment of the utility model.

[0023] Figure 7 It is a schematic diagram of a HVAC device according to an embodiment of the utility model.

[0024] Figure markings: HVAC equipment 100, motor 10, rotor assembly 11, first part 111, first main body 1111, first step portion 1112, groove 101, inner peripheral edge 1011, outer peripheral edge 1012, step surface 102, rotor shaft 112, connecting end 1121, stator assembly 12, second part 121, second main body 1211, second step portion 1212, mounting hole 103, gap 104, wind wheel 20. DETAILED DESCRIPTION

[0025] When the inventor of the present utility model conducted a motor performance test, he found that during the operation of the motor, dust may float between the stator assembly and the rotor assembly in all directions around the motor, and the dust can easily enter the interior of the motor, affecting the stability and service life of the motor. In response to this, the inventor of the present utility model set a multi-segment structure along the axial direction on the outer peripheral surface of the motor. This setting has a good effect on preventing dust from entering the interior of the motor. After many experiments and theoretical demonstrations, the technical solution and technical effect to be protected by the present utility model were obtained.

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] like Figure 1 and Figure 2 According to the motor 10 of the embodiment of the utility model, the motor 10 includes a stator assembly 12 and a rotor assembly 11, the stator assembly 12 is configured to drive the rotor assembly 11 to rotate, one of the stator assembly 12 and the rotor assembly 11 includes a first portion 111, and the other includes a second portion 121, and at least a portion of the first portion 111 is disposed outside the second portion 121 in the radial direction of the motor 10. For example, in some embodiments, the stator assembly 12 includes the first portion 111, the rotor assembly 11 includes the second portion 121, and at least a portion of the first portion 111 is disposed outside the second portion 121 in the radial direction of the motor 10, and the motor 10 may be an inner rotor motor; for another example, in other embodiments, the rotor assembly 11 includes the first portion 111, the stator assembly 12 includes the second portion 121, and at least a portion of the first portion 111 is disposed outside the second portion 121 in the radial direction of the motor 10, and the motor 10 may be an outer rotor motor. Unless otherwise specified, the following description of the first portion 111 and the second portion 121 is applicable to the aforementioned outer rotor motor and inner rotor motor.

[0028] Among them, the first part 111 includes a first main body portion 1111 and a first step portion 1112, the first main body portion 1111 and the first step portion 1112 are arranged along the axial direction of the motor 10 (refer to the up and down direction in the accompanying drawing), and the outer peripheral surface of the first step portion 1112 protrudes outward from the outer peripheral surface of the first main body portion 1111 in the radial direction (refer to the left and right direction in the accompanying drawing).

[0029] According to the motor 10 of the embodiment of the utility model, a first main body portion 1111 and a first step portion 1112 are provided on the outer peripheral surface, and the outer peripheral surface of the first step portion 1112 protrudes from the first main body portion 1111, so that falling dust will fall on the first step portion 1112, so that part of the dust can be retained on the first step portion 1112, thereby reducing the dust entering into the motor 10, and the dust-proof effect of the motor 10 can be achieved at a lower cost and without affecting the heat dissipation performance of the motor 10.

[0030] In combination with the above embodiments, Figure 1As shown, when the axis direction of the motor 10 is set to the up and down direction, dust naturally falls. When the dust approaches the gap 104 between the stator assembly 12 and the rotor assembly 11, since the first step portion 1112 protrudes outward relative to the outer circumference of the first main body portion 1111, a dust blocking effect can be formed at the connection between the first step portion 1112 and the first main body portion 1111. At this time, the dust will fall on the first step portion 1112, reducing the dust that falls on the gap 104 between the rotor assembly 11 and the stator assembly 12, thereby reducing the dust that enters the interior of the motor 10. Of course, when the axis direction of the motor 10 is set to other directions, dust in the corresponding direction will also be blocked from entering between the stator assembly 12 and the rotor assembly 11, and a certain dust-proof effect will also be achieved.

[0031] like Figure 2 In some embodiments of the present invention, the rotor assembly 11 includes a rotor shaft 112, and the rotor shaft 112 has a connecting end 1121 extending from the first portion 111 along the axial direction, and the connecting section is used to connect a driven element, such as a wind wheel 20. In the axial direction, the first main body 1111 is closer to the connecting end 1121 than the first step portion 1112. This can reduce dust entering between the stator assembly 12 and the rotor assembly 11, and improve the operating stability of the motor 10.

[0032] In order to facilitate the relative rotation of the rotor assembly 11 and the stator assembly 12, a gap 104 may be provided between the stator assembly 12 and the rotor assembly 11, and the first step portion 1112 may be provided between the gap 104 and the connection end 1121. For example, the second portion 121 includes a second step portion 1212, and the second step portion 1212 extends out of the first portion 111, and is spaced apart from the first step portion 1112 along the axial direction to form the gap. This can further improve the effect of preventing dust from entering the interior of the motor 10, facilitate dust to remain on the first step portion 1112, reduce dust flying around, and further reduce the amount of dust entering the interior of the motor 10. Further, the first step portion 1112 may be provided to be closer to the gap 104 than the connection end 1121 of the rotor shaft 112, so as to further improve the effect of preventing dust from entering the gap 104.

[0033] In addition, when the motor 10 is connected to the driven element, the driven element will be driven by the motor 10. During the rotation of the driven element, the airflow will be disturbed, causing dust to be disturbed near the motor 10. The closer to the connection end 1121 of the rotor shaft 112, the stronger the airflow disturbance effect brought by the driven element. Therefore, in the utility model, the first step portion 1112 is set to a position away from the first main body portion 1111, which can reduce the disturbance effect of the airflow on the dust and facilitate dust to fall on the first step portion 1112, thereby reducing the dust entering the motor 10 through the gap and maintaining the operating stability and service life of the motor 10.

[0034] like Figure 2 In some embodiments of the present invention, the outer peripheral surface of the first main body 1111 has first ends opposite to each other along the axial direction (see attached Figure 2 The upper end of the Figure 2 The first end of the first main body 1111 extends to the end face of the first part 111, and the second end of the first main body 1111 extends to the first step 1112. That is, the outer peripheral surface of the first main body 1111 extends in the direction from the first end to the second end, and the outer peripheral surface of the first main body 1111 extends from the periphery of the end face of the first part 111 to the first step 1112, so that the structure of the first main body 1111 can be simplified, and when dust falls on the first part 111, it can be accumulated on the first step 1112 along the axial direction, so that the dust can be easily stored in a predetermined position for easy cleaning, and the possibility of dust entering the interior of the motor 10 from other positions is reduced, thereby further improving the performance and service life of the motor 10. In addition, an intermediate structure can be provided between the first main body 1111 and the end face of the first part 111; or an intermediate structure can be provided between the first main body 1111 and the first step 1112.

[0035] like Figure 2 The outer circumference of the first main body 1111 is configured as an inclined surface that gradually expands from the first end to the second end. In this way, the outer circumference of the first main body 1111 will also have a certain flow guiding effect, thereby further guiding the dust to move away from the gap of the motor 10, effectively reducing the possibility of dust entering the motor 10.

[0036] like Figure 2In some embodiments of the present invention, the second part 121 includes a second main body 1211 and a second step 1212, the second main body 1211 is arranged radially inside the first main body 1111, the second step 1212 is connected to the second main body 1211 along the axial direction, and radially extends outward from the outer circumference of the second main body 1211, the second step 1212 is opposite to the first step 1112 along the axial direction and has a gap 104, and the first step 1112 is arranged between the second step 1212 and the first main body 1111 along the axial direction. It can facilitate the assembly of the stator assembly 12 and the rotor assembly 11, and improve the assembly efficiency and effect of the motor 10.

[0037] In some embodiments, in the projection in the axial direction, the second step portion 1212 does not extend out of the first step portion 1112, for example, at least a portion of the outer circumference of the second step portion 1212 is located inside the outer circumference of the first step portion 1112; or the outer circumference of the second step portion 1212 is flush with the outer circumference of the first step portion 1112 along the axial direction. Thereby, the shielding effect of the first step portion 1112 on the gap between the first step portion 1112 and the second step portion 1212 can be improved, thereby further reducing the possibility of dust entering the interior of the motor 10. Of course, the second step portion 1212 can also be set to extend out of the first step portion 1112, for example, a portion of the outer circumference of the second step portion 1212 extends out of the outer circumference of the first step portion 1112; or the outer circumference of the first step portion 1112 is located inside the outer circumference of the first step portion 1112.

[0038] The stator assembly 12 includes a first part 111 and a rotor shaft 112. The first part 111 is connected to the rotor shaft 112 and surrounds the rotor shaft 112. The stator assembly 12 includes a second part 121. The second part 121 has a mounting hole 103. The rotor shaft 112 is rotatably inserted into the mounting hole 103. In other words, the motor 10 is an outer rotor motor. According to the embodiment of the utility model, the above structure can effectively improve the matching stability between the stator assembly 12 and the rotor assembly 11. By inserting the rotor shaft 112 into the mounting hole 103 of the second part 121, the coaxiality of the rotor assembly 11 relative to the stator assembly 12 can be maintained, and the rotor assembly 11 is driven to rotate stably by the stator assembly 12. In addition, through this arrangement, it is possible to avoid setting a bearing structure between the first main body 1111 and the second main body 1211, thereby avoiding the impression that the fitting gap 104 between the first main body 1111 and the second main body 1211 is too large, optimizing the performance of the motor 10 and simplifying the structure of the motor 10.

[0039] In some embodiments of the utility model, the outer circumference of the first main body 1111 and the outer circumference of the first step 1112 are connected along the axial direction, that is, the outer circumference of the first main body 1111 and the outer circumference of the first step 1112 extend continuously in the axial direction. In order to realize that the first step 1112 protrudes radially outward from the outer circumference of the first main body 1111, the outer circumference of the first step 1112 can be set to a shape that gradually moves away from the axis of the motor 10 in the direction away from the first main body 1111. The outer circumference of the first step 1112 can be a bevel, an arc surface or a step structure. The outer circumference of the first step 1112 can be set to a shape such as an arc surface, a bevel or a step structure in the axial direction.

[0040] like Figure 2 and Figure 3 In other embodiments of the present invention, a step structure is formed between the outer circumference of the first main body 1111 and the outer circumference of the first step portion 1112. That is, there is a step difference between the outer circumference of the first main body 1111 and the outer circumference of the first step portion 1112, so that a step surface 102 is connected between the outer circumference of the first main body 1111 and the outer circumference of the first step portion 1112. During the use of the motor 10, dust will accumulate on the step surface 102, which can reduce or prevent dust from entering the motor 10, and maintain the running stability of the motor 10.

[0041] like Figure 4 and Figure 5 In some other embodiments of the present invention, a groove 101 is provided on the outer circumference of the first portion 111, and the opening of the groove 101 faces away from the first step portion 1112. Thus, dust can be contained by the groove 101, further preventing dust from entering the motor 10.

[0042] For example, when the step surface 102 is connected between the outer circumference of the first main body 1111 and the outer circumference of the first step portion 1112, the outer circumference 1012 of the step surface 102 is connected to the circumference of the first step portion 1112, and the inner circumference 1011 of the step surface 102 is connected to the circumference of the outer circumference of the first main body 1111. The groove 101 can be provided on the step surface 102 and face away from the first step portion 1112 along the axial direction.

[0043] Among them, in the projection along the axial direction, the opening of the groove 101 has an inner peripheral edge 1011 and an outer peripheral edge 1012 around the axis of the motor 10, and the outer peripheral edge 1012 is located radially outside the inner peripheral edge 1011 and outside the outer peripheral surface of the first main body 1111.

[0044] like Figure 4In some embodiments, the inner circumferential edge 1011 is located outside the outer circumferential surface of the first main body portion 1111; the outer circumferential surface of the first step portion 1112 and the groove 101 can be used to prevent dust from entering the interior of the motor 10, thereby effectively improving the dust prevention effect.

[0045] like Figure 5 In other embodiments, the inner circumference 1011 of the groove 101 may be set flush with the edge of the outer circumference of the first main body 1111, or located inside the edge of the outer circumference of the first main body 1111. This facilitates the falling dust to fall into the groove 101, and the dust falling along the outer circumference of the first main body 1111 can also enter the groove 101, thereby further reducing the dust reaching the gap 104 between the rotor assembly 11 and the stator assembly 12, and further improving the dust prevention effect.

[0046] The dust-proof solution proposed in the utility model is realized by a specific structure of the motor 10. The structural feature of the motor 10 is that the outer diameter surface of the motor 10 presents a step-shaped effect in the axial direction. When dust flies near the motor 10, it is easy to be blocked and stop at the corner of the step. By guiding the dust to stop at a specific position, the dust is prevented from drilling into the gap of the motor 10 during random movement. The solution adopted by the utility model is simple and easy to implement. It does not require the addition of complex parts and has low cost. In addition, compared with other solutions using a sealing structure, the solution adopted by the utility model does not emphasize reducing the gap on the surface of the motor 10, so it will not affect the heat dissipation performance of the motor 10.

[0047] The motor 10 in the utility model can be an outer rotor motor or an inner rotor motor. Taking the outer rotor motor as an example, the outer diameter surface of the motor 10 is mainly on the rotor. For the shaft extension end portion of the rotor outer diameter, a slope structure can be designed to form a preliminary blocking effect on dust. Furthermore, the outer surface of the rotor can be designed into two sections in the axial direction, so that its global or local diameter changes greatly at a certain position, thereby forming a step effect. The global or local diameter of the extension section of the rotor shaft 112 can be made smaller than the diameter of the non-extension end, that is, the concave surface of the surface step faces the shaft extension section. When dust approaches the motor 10 from the shaft extension section, the step surface 102 can form an effective blocking effect. Similarly, for the inner rotor motor, a step structure can also be designed on the outer surface of the stator, which can also achieve a dustproof effect. In addition, in addition to the two-section type, a multi-section step can also be designed on the outer surface of the motor 10 to further enhance the dustproof effect.

[0048] In addition to the above solution, a groove 101 may be formed in the axial direction of the housing of the motor 10, with the groove 101 facing the shaft extension end to wrap and store nearby dust.

[0049] In addition, if Figures 1 to 5 The utility model is mainly described by taking the outer rotor motor as an example. Figure 6 The structure of the rotor assembly 11 is shown in FIG. 1 , and a step structure is provided on the outer peripheral surface of the rotor assembly 11. Of course, the above description is only some embodiments of the utility model, and is not intended to limit the protection scope of the utility model. The motor 10 in the utility model can also be an inner rotor motor, etc.

[0050] like Figure 7 According to the HVAC equipment 100 of the embodiment of the utility model, it includes the motor 10 and the wind wheel 20 according to the above, and the wind wheel 20 is connected to the rotor assembly 11. By setting the above HVAC equipment 100, a first main body 1111 and a first step 1112 are set on the outer circumference of the motor 10, and the outer circumference of the first step 1112 protrudes from the first main body 1111, and the falling dust will fall on the first step 1112, so that part of the dust can be left on the first step 1112, reducing the dust entering the motor 10, and achieving the dustproof effect of the motor 10 at a lower cost and without affecting the heat dissipation performance of the motor 10.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A motor (10), characterized in that: The motor (10) comprises a stator assembly (12) and a rotor assembly (11), wherein the stator assembly (12) is configured to drive the rotor assembly (11) to rotate, wherein one of the stator assembly (12) and the rotor assembly (11) comprises a first portion (111), and the other comprises a second portion (121), and in a radial direction of the motor (10), at least a portion of the first portion (111) is disposed outside the second portion (121); The first part (111) comprises a first main body portion (1111) and a first step portion (1112), wherein the first main body portion (1111) and the first step portion (1112) are arranged along the axial direction of the motor (10), and the outer peripheral surface of the first step portion (1112) protrudes outwardly from the outer peripheral surface of the first main body portion (1111) along the radial direction.

2. The electric machine (10) according to claim 1, characterized in that The outer peripheral surface of the first main body portion (1111) and the outer peripheral surface of the first step portion (1112) are connected along the axial direction.

3. The electric machine (10) according to claim 1, characterized in that A step structure is formed between the outer circumferential surface of the first main body portion (1111) and the outer circumferential surface of the first step portion (1112).

4. The electric machine (10) according to any one of claims 1 to 3, characterized in that: The rotor assembly (11) comprises a rotor shaft (112), the rotor shaft (112) having a connection end (1121) extending out of the first portion (111) along the axial direction, and the first main body portion (1111) is closer to the connection end (1121) than the first step portion (1112) in the axial direction.

5. The electric machine (10) according to any one of claims 1 to 3, characterized in that: The outer peripheral surface of the first main body portion (1111) has a first end and a second end opposite to each other along the axial direction, the first end of the first main body portion (1111) extends to connect with the end surface of the first part (111), and the second end of the first main body portion (1111) extends to connect with the first step portion (1112).

6. The electric machine (10) according to claim 5, characterized in that The outer peripheral surface of the first main body (1111) is configured as an inclined surface that gradually expands outward from the first end to the second end.

7. The electric machine (10) according to claim 1, characterized in that The second part (121) includes a second main body portion (1211) and a second step portion (1212), wherein the second main body portion (1211) is arranged radially inner than the first main body portion (1111), the second step portion (1212) is connected to the second main body portion (1211) along the axial direction and extends radially outward from the outer peripheral surface of the second main body portion (1211), the second step portion (1212) and the first step portion (1112) are opposite to each other along the axial direction and have a gap (104), and the first step portion (1112) is arranged between the second step portion (1212) and the first main body portion (1111) along the axial direction.

8. The electric machine (10) according to any one of claims 1 to 3, characterized in that: The stator assembly (12) comprises the first part (111) and a rotor shaft (112), wherein the first part (111) is connected to the rotor shaft (112) and surrounds the rotor shaft (112), and the stator assembly (12) comprises the second part (121), wherein the second part (121) has a mounting hole (103), and the rotor shaft (112) is rotatably inserted into the mounting hole (103).

9. The electric machine (10) according to any one of claims 1 to 3, characterized in that: A groove (101) is provided on the outer peripheral surface of the first part (111), and the opening of the groove (101) faces in a direction away from the first step portion (1112).

10. The electric machine (10) according to claim 9, characterized in that In the projection along the axial direction, the opening of the groove (101) has an inner peripheral edge (1011) and an outer peripheral edge (1012) surrounding the axis of the motor (10); the outer peripheral edge (1012) is located radially outside the inner peripheral edge (1011) and outside the outer peripheral surface of the first main body (1111); the inner peripheral edge (1011) is located outside the outer peripheral surface of the first main body (1111), flush with the edge of the outer peripheral surface of the first main body (1111) or inside the edge of the outer peripheral surface of the first main body (1111).

11. A heating and ventilation equipment (100), characterized in that: It comprises a motor (10) and a wind wheel (20) according to any one of Claims 1 to 10, wherein the wind wheel (20) is connected to the rotor assembly (11).

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