CN222234553U - Motors and HVAC equipment - Google Patents

Abstract

The utility model discloses a motor and heating 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, the other one of the stator assembly and the rotor assembly comprises a second part, at least part of the first part is arranged outside 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 along the axial direction of the motor, and the outer peripheral surface of the first step part protrudes outwards in the radial direction of 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, the outer peripheral surface of the first step part protrudes out of the first main body part, dust falling along the circumferential direction can fall onto the first step part, so that part of dust can be left on the first step part, and the dustproof effect of the motor can be realized on the premise of lower cost and no influence on the heat dissipation performance of the motor.

Description

Motor and heating and ventilation equipment

Technical Field

The utility model relates to the technical field of electric drive, in particular to a motor and heating and ventilation equipment comprising the motor.

Background

The motor mainly comprises a rotor and a stator, a certain gap is formed between the rotor and the stator after the motor is assembled, and part of dust can enter the motor through the gap in long-time use, so that the motor noise is abnormal, and the service life of the motor is shortened. Therefore, the dustproof effect of the motor needs to be considered in daily application, so that the situation is avoided. In the related art, some motors adopt a sealing structure to prevent dust, but the structure is complex, the cost is high, and the heat dissipation performance of the motor may be affected.

Disclosure of utility model

An object of the present utility model is to provide a motor in which a first main body portion and a first step portion are provided on an outer peripheral surface, and the outer peripheral surface of the first step portion is protruded from the first main body portion, and dust falling in a circumferential direction is allowed to fall onto the first step portion, so that a part of dust can be left on the first step portion, and a dust-proof effect of the motor can be achieved at a low cost without affecting a heat radiation performance of the motor.

Another object of the utility model is to propose a heating and ventilation device comprising a motor as described above.

According to the motor, the motor comprises a stator assembly and a rotor assembly, wherein 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, the other one of the stator assembly and the rotor assembly 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 along the axial direction of the motor, and the outer peripheral surface of the first step part protrudes outwards from the outer peripheral surface of the first main body part along the radial direction.

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, the outer peripheral surface of the first step part protrudes out of the first main body part, dust falling along the circumferential direction can fall onto the first step part, so that part of dust can be left on the first step part, and the dustproof effect of the motor can be realized on the premise of lower cost and no influence on the heat dissipation performance of the motor.

In addition, the motor according to the above embodiment of the present utility model may further have the following additional technical features:

In some embodiments, the rotor assembly includes a rotor shaft having a connection end protruding from the first portion in the axial direction, the first body portion being closer to the connection end than the first step portion in the axial direction.

In some embodiments, the outer peripheral surface of the first body portion has a first end and a second end opposite in the axial direction, the first end of the first body portion extends to meet the end face of the first portion, and the second end of the first body portion extends to meet the first step portion.

In some embodiments, the outer peripheral surface of the first body portion is configured as a tapered surface that tapers outwardly from the first end to the second end.

In some embodiments, the second portion includes a second main body portion and a second step portion, the second main body portion is disposed radially inward of the first main body portion, the second step portion is connected to the second main body portion along the axis direction and extends radially outward beyond an outer peripheral surface of the second main body portion, the second step portion is opposite to the first step portion along the axis direction and has a gap, and the first step portion is disposed between the second step portion and the first main body portion along the axis direction.

In some embodiments, the stator assembly includes the first portion and a rotor shaft, the first portion being coupled to and surrounding the rotor shaft, the stator assembly includes the second portion having a mounting hole through which the rotor shaft rotatably passes.

In some embodiments, the outer peripheral surface of the first main body portion and the outer peripheral surface of the first step portion meet in the axial direction, or a step structure is formed between the outer peripheral surface of the first main body portion and the outer peripheral surface of the first step portion.

In some embodiments, the groove is provided on the outer peripheral surface of the first portion, and an opening of the groove faces in a direction away from the first step portion.

In some embodiments, in projection along the axis direction, the opening of the groove has an inner peripheral edge and an outer peripheral edge around the motor axis, the outer peripheral edge being located radially outward of the inner peripheral edge and outward of the outer peripheral surface of the first body portion, the inner peripheral edge being located outward of the outer peripheral surface of the first body portion, flush with a rim of the outer peripheral surface of the first body portion, or located inward of a rim of the outer peripheral surface of the first body portion.

The heating and ventilation equipment comprises the motor and the wind wheel, wherein the wind wheel is connected with the rotor assembly.

Drawings

Fig. 1 is a schematic diagram of an electric machine according to an embodiment of the utility model.

Fig. 2 is a cross-sectional view of an electric machine according to an embodiment of the present utility model.

Fig. 3 is an enlarged partial schematic view of the area a in fig. 2.

Fig. 4 is an enlarged partial schematic view of a cross-sectional view of a motor according to another embodiment of the present utility model.

Fig. 5 is an enlarged partial schematic view of a cross-sectional view of a motor according to still another embodiment of the present utility model.

Fig. 6 is a schematic diagram of a rotor assembly of an electric machine in accordance with one embodiment of the present utility model.

FIG. 7 is a schematic view of a heating and ventilation apparatus in accordance with one embodiment of the present utility model.

Reference numerals are a heating and ventilation apparatus 100, a motor 10, a rotor assembly 11, a first portion 111, a first body portion 1111, a first step portion 1112, a groove 101, an inner peripheral edge 1011, an outer peripheral edge 1012, a step surface 102, a rotor shaft 112, a connection end 1121, a stator assembly 12, a second portion 121, a second body portion 1211, a second step portion 1212, a mounting hole 103, a gap 104, and a rotor 20.

Detailed Description

The inventor of the present utility model has found that dust may fall between the stator assembly and the rotor assembly in various directions around the motor during operation of the motor, and the dust may easily enter the motor to affect the stability and the service life of the motor. For this, the inventor sets up the multistage structure along the axis direction on the outer peripheral face of motor, through this setting, has fine effect to prevent that dust from entering into the motor inside, has passed many experiments and theoretical demonstration, has obtained the technical scheme and the technological effect that the utility model is protected.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 and 2, according to an embodiment of the present utility model, the motor 10 includes a stator assembly 12 and a rotor assembly 11, the stator assembly 12 being configured to drive the rotor assembly 11 to rotate, one of the stator assembly 12 and the rotor assembly 11 including a first portion 111, and the other including a second portion 121, at least a portion of the first portion 111 being disposed outside the second portion 121 in a radial direction of the motor 10. For example, in some embodiments, the stator assembly 12 includes a first portion 111, the rotor assembly 11 includes a second portion 121, at least a portion of the first portion 111 is disposed outside the second portion 121 in a radial direction of the motor 10, the motor 10 may be an inner rotor motor, and in other embodiments, the rotor assembly 11 includes a first portion 111, the stator assembly 12 includes a second portion 121, at least a portion of the first portion 111 is disposed outside the second portion 121 in a radial direction of the motor 10, and the motor 10 may be an outer rotor motor. The following description of the first portion 111 and the second portion 121 applies to the aforementioned outer rotor motor and inner rotor motor unless otherwise specified.

Wherein the first portion 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 an axial direction of the motor 10 (refer to an up-down direction in the drawing), and an outer peripheral surface of the first step portion 1112 protrudes outward in a radial direction (refer to a left-right direction in the drawing) from an outer peripheral surface of the first main body portion 1111.

According to the motor 10 of the embodiment of the utility model, the first main body 1111 and the first step 1112 are arranged on the outer peripheral surface, the outer peripheral surface of the first step 1112 is protruded out of the first main body 1111, and the fallen dust falls onto the first step 1112, so that part of the dust can be left on the first step 1112, the dust entering the motor 10 is reduced, and the dust prevention effect of the motor 10 can be realized on the premise of lower cost and no influence on the heat dissipation performance of the motor 10.

In connection with the foregoing embodiment, as shown in fig. 1, when the axial direction of the motor 10 is set to the up-down direction, dust naturally falls, and when dust approaches the gap 104 of the stator assembly 12 and the rotor assembly 11, since the first step portion 1112 protrudes outward with respect to the outer peripheral surface of the first main body portion 1111, an effect of blocking dust can be formed at the junction of the first step portion 1112 and the first main body portion 1111, at this time, dust falls onto the first step portion 1112, dust falling onto the gap 104 of the rotor assembly 11 and the stator assembly 12 is reduced, and dust entering the inside of the motor 10 is reduced. Of course, when the axial direction of the motor 10 is set to other directions, dust in the corresponding direction is also blocked from entering between the stator assembly 12 and the rotor assembly 11, and a certain dust-proof effect is also provided.

In some embodiments of the utility model, as shown in fig. 2, the rotor assembly 11 includes a rotor shaft 112, the rotor shaft 112 having a connection end 1121 extending axially beyond the first portion 111 for connection to a driven element, such as a wind wheel 20 or the like. The first main body portion 1111 is closer to the connection end 1121 than the first step portion 1112 in the axial direction. So that dust entering between the stator assembly 12 and the rotor assembly 11 can be reduced, and the operation stability of the motor 10 can be improved.

Wherein, 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 a 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 protrudes from the first portion 111 and is spaced apart from the first step portion 1112 in the axial direction, and forms the gap. Thereby, it is possible to further improve the blocking of dust from entering the inside of the motor 10, facilitate the dust to remain on the first step portion 1112, reduce the dust scattered around, and further reduce the amount of dust entering the inside of the motor 10. The first step 1112 may be further disposed closer to the gap 104 than the connecting end 1121 of the rotor shaft 112, so that the effect of blocking dust from entering into the gap 104 may be further improved.

In addition, when the motor 10 is connected to the driven element, the driven element will be driven by the motor 10, and during the rotation of the driven element, the airflow will be disturbed, so that the dust will be disturbed near the motor 10, but the closer to the connecting end 1121 of the rotor shaft 112, the stronger the airflow disturbance effect caused by the driven element, so in the utility model, the first step 1112 is arranged at a position far from the first main body 1111, so that the disturbance effect of the airflow on the dust can be reduced, the dust will fall on the first step 1112 conveniently, and the dust entering the motor 10 through the gap is reduced, and the running stability and the service life of the motor 10 are maintained.

As shown in fig. 2, in some embodiments of the present utility model, the outer circumferential surface of the first body portion 1111 has a first end (refer to the upper end in fig. 2) and a second end (refer to the lower end in fig. 2) opposite in the axial direction, the first end of the first body portion 1111 extends to meet the end face of the first portion 111, and the second end of the first body portion 1111 extends to meet the first step portion 1112. That is, the outer circumferential surface of the first body portion 1111 extends in the direction from the first end to the second end, and the outer circumferential surface of the first body portion 1111 extends from the end surface circumferential edge of the first portion 111 to the first step portion 1112, so that the structure of the first body portion 1111 can be simplified, and dust can be accumulated on the first step portion 1112 in the axial direction when it falls onto the first portion 111, so that it is possible to facilitate the dust to be retained to a predetermined position for cleaning, and reduce the possibility of the dust entering the inside of the motor 10 from other positions, thereby further improving the performance and the service life of the motor 10. In addition, an intermediate structure may be provided between the first body portion 1111 and the end surface of the first portion 111, or an intermediate structure may be provided between the first body portion 1111 and the first step portion 1112.

As shown in fig. 2, the outer circumferential surface of the first body portion 1111 is configured as a slope gradually expanding outward from the first end to the second end. Thus, the outer peripheral surface of the first body 1111 also has certain flow guiding and guiding effects, so as to further guide the dust to move away from the gap of the motor 10, and effectively reduce the possibility of the dust entering the motor 10.

As shown in fig. 2, in some embodiments of the present utility model, the second portion 121 includes a second body portion 1211 and a second step portion 1212, the second body portion 1211 is disposed radially inward of the first body portion 1111, the second step portion 1212 is connected to the second body portion 1211 in the axial direction and protrudes radially outward from an outer circumferential surface of the second body portion 1211, the second step portion 1212 is opposite to the first step portion 1112 in the axial direction with a gap 104, and the first step portion 1112 is disposed between the second step portion 1212 and the first body portion 1111 in the axial direction. The stator assembly 12 and the rotor assembly 11 can be conveniently assembled, and the assembly efficiency and effect of the motor 10 can be improved.

In some embodiments, the second step 1212 does not extend beyond the first step 1112 in the projection in the axial direction, e.g., at least a portion of the outer peripheral surface of the second step 1212 is located inside the outer peripheral surface of the first step 1112, or the outer peripheral surface of the second step 1212 is flush with the outer peripheral surface of the first step 1112 in 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 inside of the motor 10. Of course, the second step portion 1212 may be provided so as to protrude from the first step portion 1112, for example, a part of the outer peripheral surface of the second step portion 1212 protrudes from the outer peripheral surface of the first step portion 1112, or the outer peripheral surface of the first step portion 1112 is located inside the outer peripheral surface of the first step portion 1112.

Wherein the stator assembly 12 comprises a first portion 111 and a rotor shaft 112, the first portion 111 is connected with the rotor shaft 112 and surrounds the rotor shaft 112, the stator assembly 12 comprises a second portion 121, the second portion 121 is provided with a mounting hole 103, and the rotor shaft 112 is rotatably arranged through the mounting hole 103. That is, the motor 10 is an external rotor motor, and according to the embodiment of the present utility model, the stability of the fit between the stator assembly 12 and the rotor assembly 11 can be effectively improved by the above-described structure. By threading the rotor shaft 112 through the mounting hole 103 of the second portion 121, the coaxiality of rotation of the rotor assembly 11 relative to the stator assembly 12 can be maintained, and the rotor assembly 11 can be driven to stably rotate by the stator assembly 12. In addition, with this arrangement, it is possible to avoid providing a bearing structure between the first body portion 1111 and the second body portion 1211, and further to avoid impressing an excessive fit clearance 104 between the first body portion 1111 and the second body portion 1211, to optimize the performance of the motor 10, and to simplify the structure of the motor 10.

In some embodiments of the present utility model, the outer circumferential surface of the first main body portion 1111 and the outer circumferential surface of the first step portion 1112 meet in the axial direction, that is, the outer circumferential surface of the first main body portion 1111 and the outer circumferential surface of the first step portion 1112 extend continuously in the axial direction, in order to achieve that the first step portion 1112 protrudes radially outward from the outer circumferential surface of the first main body portion 1111, the outer circumferential surface of the first step portion 1112 may be provided in a shape gradually distant from the axis of the motor 10 in a direction away from the first main body portion 1111, the outer circumferential surface of the first step portion 1112 may be a slope, a cambered surface, a step structure, or the like. The outer peripheral surface of the first step portion 1112 may be provided in the shape of an arc surface, an inclined surface, a step structure, or the like in the axial direction.

As shown in fig. 2 and 3, in other embodiments of the present utility model, a stepped structure is configured between the outer circumferential surface of the first body portion 1111 and the outer circumferential surface of the first stepped portion 1112. That is, since the step surface 102 is connected between the outer peripheral surface of the first body 1111 and the outer peripheral surface of the first step portion 1112 by the step difference between the outer peripheral surface of the first body 1111 and the outer peripheral surface of the first step portion 1112, dust is accumulated on the step surface 102 during use of the motor 10, and the entry of dust into the motor 10 can be reduced or prevented, thereby maintaining the operation stability of the motor 10.

In still other embodiments of the present utility model, as shown in fig. 4 and 5, a groove 101 is provided on the outer peripheral surface of the first portion 111, and the opening of the groove 101 faces in a direction away from the first step 1112. So that dust can be accommodated by the grooves 101, further preventing dust from entering the inside of the motor 10.

For example, when the step surface 102 is connected between the outer peripheral surface of the first body 1111 and the outer peripheral surface of the first step portion 1112, the outer peripheral edge 1012 of the step surface 102 is connected to the peripheral edge of the first step portion 1112, and the inner peripheral edge 1011 of the step surface 102 is connected to the peripheral edge of the outer peripheral surface of the first body 1111. Wherein the groove 101 may be provided on the step surface 102 and directed in the axial direction away from the first step portion 1112.

Wherein in projection in 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, the outer peripheral edge 1012 being located radially outward of the inner peripheral edge 1011 and outward of the outer peripheral surface of the first body portion 1111.

In some embodiments, as shown in fig. 4, the inner peripheral edge 1011 is located outside the outer peripheral surface of the first body portion 1111, and dust which now enters the inside of the motor 10 can be effectively improved by the cooperation of the outer peripheral surface of the first step portion 1112 and the groove 101.

As shown in fig. 5, in other embodiments, the inner peripheral edge 1011 of the groove 101 may also be disposed flush with the edge of the outer peripheral surface of the first body portion 1111 or inside the edge of the outer peripheral surface of the first body portion 1111. Thus, it is possible to facilitate falling dust to fall into the groove 101, and dust falling along the outer circumferential surface of the first body portion 1111 can also enter into the groove 101, thereby further reducing dust reaching the gap 104 between the rotor assembly 11 and the stator assembly 12, and further improving the dust-proof effect.

The dust-proof solution proposed by the present utility model is achieved by a specific structure of the motor 10, the structural characteristics of the motor 10 being such that the outer diameter surface of the motor 10 presents a stepped shape effect in the axial direction. When dust flies near the motor 10, it is liable to get blocked at the corners of the steps to stop. By this way of guiding the dust to a specific position, it is prevented that the dust drills into the gaps of the motor 10 during random movements. The utility model has the advantages of simple scheme, easy realization, no need of adding complex parts and low cost. In addition, compared with other schemes adopting sealing structures, the scheme adopted by the utility model does not emphasize the reduction of the gaps on the surface of the motor 10, so that the heat dissipation performance of the motor 10 is not affected.

The motor 10 of the present utility model may be an outer rotor motor or an inner rotor motor. Taking an outer rotor motor as an example, the outer diameter surface of the motor 10 is mainly on the rotor. For the shaft extension end part of the outer diameter of the rotor, an inclined surface structure can be designed to form a preliminary blocking effect on dust. Further, the outer surface of the rotor can be designed into two sections in the axial direction, so that the global or local diameter of the rotor can be changed greatly at a certain position, and the step effect is formed. The overall or local diameter of the rotor shaft 112 extension may be made smaller than the diameter of the non-shaft extension, i.e., the concave surface of the surface step is made to face the shaft extension, and the step surface 102 may provide an effective barrier as dust approaches the motor 10 from the shaft extension. Similarly, for the inner rotor motor, a step structure can be designed on the outer surface of the stator, and the dustproof effect can be realized. In addition, instead of the two-stage type, a multi-stage step may be designed on the outer surface of the motor 10, so that the dust-proof effect is further enhanced.

In addition to the above-mentioned solution, a groove 101 may be formed in the housing of the motor 10 in the axial direction, so that the groove 101 faces the shaft extension end, and forms a wrapping and accommodating function for the dust nearby.

In addition, as shown in fig. 1 to 5, the present utility model is mainly described by taking an outer rotor motor as an example, and fig. 6 shows a structure of a rotor assembly 11, and a stepped structure is provided on an outer circumferential surface of the rotor assembly 11. Of course, the above description is only some embodiments of the present utility model, and is not intended to limit the scope of the present utility model, and the motor 10 of the present utility model may be an inner rotor motor.

Referring to fig. 7, a heating and ventilation apparatus 100 according to an embodiment of the present utility model includes a motor 10 and a wind wheel 20 according to the foregoing description, and the wind wheel 20 is connected to a rotor assembly 11. By providing the foregoing heating ventilation apparatus 100, the first main body portion 1111 and the first step portion 1112 are provided on the outer peripheral surface of the motor 10, and the outer peripheral surface of the first step portion 1112 protrudes beyond the first main body portion 1111, and the falling dust falls onto the first step portion 1112, so that part of the dust can be left on the first step portion 1112, dust entering the inside of the motor 10 can be reduced, and the dust-proof effect of the motor 10 can be achieved at a lower cost without affecting the heat radiation performance of the motor 10.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (11)

1. An electric machine (10), characterized in that the electric machine (10) comprises a stator assembly (12) and a rotor assembly (11), the stator assembly (12) being configured to drive the rotor assembly (11) in rotation, one of the stator assembly (12) and the rotor assembly (11) comprising a first portion (111) and the other comprising a second portion (121), at least part of the first portion (111) being arranged outside the second portion (121) in the radial direction of the electric machine (10);

the first portion (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 in an axial direction of the motor (10), and an outer peripheral surface of the first step portion (1112) protrudes outward in the radial direction from an outer peripheral surface of the first main body portion (1111).

2. The motor (10) according to claim 1, characterized in that an outer peripheral surface of the first main body portion (1111) and an outer peripheral surface of the first step portion (1112) are in contact with each other in the axial direction.

3. The motor (10) according to claim 1, characterized in that a stepped structure is configured between an outer peripheral surface of the first main body portion (1111) and an outer peripheral surface of the first stepped portion (1112).

4. A motor (10) according to any one of claims 1-3, characterized in that the rotor assembly (11) comprises a rotor shaft (112), the rotor shaft (112) having a connecting end (1121) protruding out of the first portion (111) in the axial direction, in which axial direction the first body portion (1111) is closer to the connecting end (1121) than the first step portion (1112).

5. A motor (10) according to any one of claims 1-3, wherein an outer peripheral surface of the first main body portion (1111) has a first end and a second end opposite in the axial direction, the first end of the first main body portion (1111) extends to meet an end face of the first portion (111), and the second end of the first main body portion (1111) extends to meet the first step portion (1112).

6. The electric machine (10) of claim 5, wherein an outer peripheral surface of the first body portion (1111) is configured as a slope that gradually expands outwardly from the first end to the second end.

7. The motor (10) according to claim 1, wherein the second portion (121) includes a second main body portion (1211) and a second step portion (1212), the second main body portion (1211) being provided radially inward of the first main body portion (1111), the second step portion (1212) being connected to the second main body portion (1211) in the axial direction and extending radially outward from an outer peripheral surface of the second main body portion (1211), the second step portion (1212) being opposed to the first step portion (1112) in the axial direction with a gap (104), the first step portion (1112) being provided between the second step portion (1212) and the first main body portion (1111) in the axial direction.

8. A machine (10) according to any one of claims 1-3, characterized in that the stator assembly (12) comprises the first part (111) and a rotor shaft (112), the first part (111) being connected to the rotor shaft (112) and surrounding the rotor shaft (112), the stator assembly (12) comprising the second part (121), the second part (121) having a mounting hole (103), the rotor shaft (112) being rotatably arranged through the mounting hole (103).

9. A motor (10) according to any one of claims 1-3, characterized in that a groove (101) is provided on the outer circumferential surface of the first part (111), the opening of the groove (101) facing in a direction away from the first step (1112).

10. The electric motor (10) according to claim 9, characterized in that in projection in 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 electric motor (10), the outer peripheral edge (1012) being located radially outside the inner peripheral edge (1011) and outside the outer peripheral surface of the first main body portion (1111), the inner peripheral edge (1011) being located outside the outer peripheral surface of the first main body portion (1111), flush with the edge of the outer peripheral surface of the first main body portion (1111), or inside the edge of the outer peripheral surface of the first main body portion (1111).

11. A heating and ventilation device (100), characterized by comprising an electric machine (10) according to any one of claims 1-10 and a wind wheel (20), said wind wheel (20) being connected to said rotor assembly (11).