Motor

Abstract

A motor includes a housing having a first wall having a first side and a second side opposite to each other in a first direction; a stator positioned on a first side of the first wall; and at least one part of the heat dissipation piece penetrates through the first wall from the second side and is thermally coupled with the stator. According to the technical scheme, the heat dissipation effect of the motor can be optimized, and the performance of the motor is improved.

Description

Technical Field

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

[0002] In the field of motor technology, external rotor motors have been widely used due to their compact structure and light weight. However, in existing technologies, the heat dissipation problem of the stator laminations is particularly prominent. Specifically, the stator laminations are usually directly fixed to a plastic support base. The plastic support base and the surrounding air, being poor conductors of heat, greatly limit the effective dissipation of heat from the stator. During operation, the stator generates a large amount of heat. If this heat cannot be dissipated in time, it will cause the internal temperature of the motor to rise, leading to a series of adverse effects. For example, high temperatures accelerate the aging of the internal insulation materials, reducing their insulation performance and increasing the risk of motor failure. Simultaneously, excessively high temperatures can also affect the electromagnetic performance of the motor, leading to reduced efficiency, increased losses, and other problems, thus affecting the overall performance of the motor. Furthermore, prolonged operation at high temperatures will shorten the motor's lifespan and increase maintenance costs.

[0003] Therefore, heat dissipation efficiency is crucial for the stable operation, performance, and lifespan extension of a motor. Utility Model Content

[0004] One object of this utility model is to provide an improved motor.

[0005] Therefore, this utility model embodiment provides an electric motor, including: a housing having a first wall, the first wall having opposing first and second sides along a first direction; a stator positioned on the first side of the first wall; and a heat sink, at least a portion of which passes through the first wall from the second side and is thermally coupled to the stator.

[0006] Therefore, by achieving thermal coupling between at least a portion of the heat sink and the stator through the first wall of the housing, heat conduction efficiency is greatly improved. This effectively dissipates heat generated by the stator to the external environment, significantly reducing the internal temperature of the motor, extending its service life, and improving its operational stability and efficiency.

[0007] Optionally, the stator includes a hollow portion, into which the heat sink extends at least partially. Thus, the heat sink can effectively conduct heat accumulated in the hollow portion to the outside of the housing.

[0008] Optionally, a first groove is formed on the wall of the hollow portion of the stator, opening towards the center of the hollow portion. The first groove is used to accommodate the portion of the heat sink extending into the hollow portion. Thus, the first groove accommodating the portion of the heat sink extending into the hollow portion enhances the overall structural stability of the motor.

[0009] Optionally, the motor further includes: a support portion supported on the first side and at least partially located within the hollow portion, wherein the stator is supported on the first side by the support portion, and the heat sink is at least partially located between the support portion and the stator in a plane perpendicular to the first direction. Thus, the support portion allows the stator and the heat sink (specifically, the coupling portion) to stably engage with the housing, enhancing the overall structural stability of the motor. The heat sink, sandwiched between the support portion and the stator, allows heat from the stator to be conducted to the outside of the housing by the heat sink, which has better thermal conductivity, before reaching the support portion, optimizing heat dissipation.

[0010] Optionally, the support portion has a second groove opening towards the hollow portion to accommodate the part of the heat sink located between the support portion and the stator. This allows the heat sink to be securely connected to the support portion, thereby achieving a reliable connection between the stator, the support portion, and the heat sink.

[0011] Optionally, the stator has a first groove on the wall forming the hollow portion, opening towards the center of the hollow portion, and the support portion has a second groove opening towards the wall forming the hollow portion of the stator. The first groove and the second groove together form a mounting hole to accommodate the portion of the heat sink located between the support portion and the stator. Thus, the portion of the heat sink extending into the mounting hole can simultaneously limit the movement of the support portion and the stator, thereby restricting the relative movement of the housing and the stator.

[0012] Optionally, the cross-sectional shape of the mounting hole includes at least one apex. Therefore, the mounting hole with the apex and the portion of the heat sink extending into the mounting hole fit together, enhancing the limiting effect. For example, the cross-sectional shape is rectangular. Optionally, the depth of the first groove is less than the depth of the second groove. This prevents the first groove from occupying too much space on the stator and affecting the strength of the stator.

[0013] Optionally, the heat sink includes: a heat dissipation portion disposed on the second side of the first wall; at least one coupling portion extending from the heat dissipation portion toward the first side; the first wall has at least one first through hole extending in a first direction; the at least one coupling portion and the at least one first through hole correspond one-to-one; the coupling portion passes through the corresponding first through hole and is thermally coupled to the stator. Thus, the coupling portion is used to extend into the housing to absorb heat, and the heat dissipation portion is used to dissipate heat to the external environment of the housing, thereby achieving a better heat dissipation effect.

[0014] Optionally, the heat dissipation part is disc-shaped, and a plurality of coupling parts are spaced apart around the heat dissipation part. Along the first direction, the projected shape of the heat dissipation part exceeds the outer contour of the shape jointly enclosed by the projections of the plurality of coupling parts. Therefore, the heat dissipation surface of the heat dissipation part can be further enlarged, thereby increasing the heat dissipation area and optimizing the heat dissipation effect.

[0015] Optionally, along the first direction, the heat dissipation portion includes a first surface and a second surface facing each other, wherein the at least one coupling portion extends from the first surface, and the second surface has a groove structure. This increases the heat dissipation area of ​​the heat dissipation portion and optimizes the heat dissipation effect.

[0016] Optionally, the motor further includes: a rotor, fitted onto the stator, the rotor being able to rotate under the drive of the stator; wherein the rotor includes: a rotor housing, covering the stator; a magnetic element, disposed on the inner wall of the rotor housing, the magnetic element rotating under the drive of the stator to drive the rotor housing to rotate; and an output shaft, connected to the rotor housing and moving synchronously with the rotor housing. Thus, the rotor and stator cooperate to form an external rotor motor structure. The external rotor motor has a larger rotor outer diameter and a smaller air gap with the stator, therefore it has higher motor efficiency, can better utilize electrical energy, and save energy.

[0017] Optionally, the stator includes: an iron core comprising an annular main body and at least one protruding portion extending from the main body in a direction away from the center; and at least one winding wound around the at least one protruding portion. Thus, heat generated by the winding, which serves as a heat source, can be transferred from the protruding portion to the main body and further guided out of the housing by a heat sink. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a motor according to an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 The structure shown is a cross-sectional view from the perspective of angle AA;

[0020] Figure 3 yes Figure 2 Exploded view of the structure shown;

[0021] Figure 4 yes Figure 1 Schematic diagram of the middle shell;

[0022] Figure 5 yes Figure 1 A schematic diagram of the stator of the motor shown;

[0023] Figure 6 yes Figure 1 A schematic diagram of the heat sink for the motor shown.

[0024] In the attached image:

[0025] 100-Motor; 1-Housing; 11-First wall; 111-First side; 112-Second side; 113-First through hole; 12-Support part; 121-Second groove; 122-Second through hole; 1221-First hole segment; 1222-Second hole segment; 1223-Stepped structure; 2-Stator; 21-Hollow part; 22-First groove; 23-Iron core; 231-Main body; 232-Extended part; 24-Winding; 3-Heat sink; 31-Heat sink; 311-First surface; 312-Second surface; 32-Coupling part; 4-Rotor; 41-Rotor housing; 42-Magnetic component; 43-Output shaft; 5-Bearing structure. Detailed Implementation

[0026] As mentioned in the background section, existing motors have poor heat dissipation, which affects their normal operation.

[0027] To solve the above-mentioned technical problems, this utility model provides an electric motor, including: a housing having a first wall, the first wall having a first side and a second side opposite to each other along a first direction; a stator positioned on the first side of the first wall; and a heat sink, at least a portion of which passes through the first wall from the second side and is thermally coupled to the stator.

[0028] Therefore, by directly connecting at least a portion of the heat sink to the stator through the first wall of the housing to achieve thermal coupling, the heat conduction efficiency is greatly improved. The heat sink includes a heat dissipation section and at least one coupling section thereon, which not only increases the heat dissipation area but also effectively conducts the heat generated by the stator to the external environment, significantly reducing the internal temperature of the motor, extending the service life of the motor, and improving the operating stability and efficiency of the motor.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of a motor 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 The structure shown is a cross-sectional view along the AA angle. Figure 3 yes Figure 2 Exploded view of the structure shown.

[0031] Combination Figures 1 to 3The motor 100 may include a housing 1, a stator 2, and a heat sink 3. The housing 1 may have a first wall 11, which has a first side 111 and a second side 112 along a first direction D1. The stator 2 is positioned on the first side 111 of the first wall 11. At least a portion of the heat sink 3 passes through the first wall 11 from the second side 112 and is thermally coupled to the stator 2.

[0032] Therefore, by directly connecting at least a portion of the heat sink 3 through the first wall 11 of the housing 1 to the stator 2 for thermal coupling, the heat conduction efficiency is greatly improved. This effectively conducts the heat generated by the stator 2 to the external environment, significantly reducing the internal temperature of the motor 100, extending the service life of the motor 100, and improving the operational stability and efficiency of the motor 100.

[0033] Specifically, the motor 100 can be used in various household appliances, such as washing machines, refrigerators, and air conditioners. By improving the heat dissipation of the motor 100, it is beneficial to improve the performance of household appliances, extend their service life, and reduce their energy consumption.

[0034] In some embodiments, the first side 111 may refer, for example, to the interior of the housing 1, that is, the side of the housing 1 that houses the stator 2 and the rotor 4. The second side 112 may refer, for example, to the exterior of the housing 1, through which heat generated between the components inside the housing 1 (e.g., the stator 2 and the rotor 4) is transferred to the exterior of the housing 1 via the heat sink 3.

[0035] In some embodiments, reference Figure 5 The stator 2 includes a hollow portion 21, and the heat sink 3 extends at least partially into the hollow portion 21.

[0036] Furthermore, the hollow portion 21 can form an internal space, providing space for the heat sink 3 to extend into, while also helping to reduce the weight of the stator 2 and improve the working efficiency of the motor 100.

[0037] Furthermore, at least a portion of the heat sink 3 can extend into the hollow portion 21 of the stator 2. Thus, the heat sink 3 can exchange heat more directly with the stator 2, effectively absorbing the heat generated by the stator 2 and conducting it to the external environment of the motor housing 100, thereby achieving the purpose of heat dissipation.

[0038] In some embodiments, continue to refer to Figure 5 The stator 2 is formed by providing a first groove 22 on the wall of the hollow part 21, which opens toward the center of the hollow part 21. The first groove 22 is used to accommodate the portion of the heat sink 3 that extends into the hollow part 21.

[0039] Furthermore, the first groove 22 can be a through-slot structure extending along the first direction D1. Thus, the portion of the heat sink 3 extending into the hollow portion 21 can be embedded in the first groove 22, thereby increasing the heat transfer efficiency by increasing the thermal coupling area, and thus optimizing the heat dissipation efficiency of the motor 100.

[0040] In some embodiments, combined with Figures 2 to 4 The motor 100 may further include: a support portion 12, which is supported on the first side 111 and is at least partially located within the hollow portion 21, wherein the stator 2 is supported on the first side 111 by the support portion 12, and wherein, in a plane perpendicular to the first direction D1, the heat sink 3 is at least partially located between the support portion 12 and the stator 2.

[0041] In some embodiments, the support portion 12 may be generally columnar and disposed on the surface of the housing 1 facing the first side 111. Further, the hollow portion 21 may, for example, include a through hole with a circular cross-section. The stator 2 can be supported on the first side 111 of the housing 1 by being fitted onto the support portion 12. In this scenario, at least a portion of the cylindrical support portion 12 is inserted into the hollow portion 21.

[0042] Furthermore, at least a portion of the heat sink 3 can be clamped between the outer peripheral surface of the support portion 12 and the inner wall of the hollow portion 21. Thus, the heat sink 3 can be thermally coupled to both the support portion 12 and the heat sink 3, thereby ensuring that heat inside the housing 1 can be efficiently conducted to the external environment.

[0043] Furthermore, the support portion 12 may have a second groove 121 opening toward the hollow portion 21. The second groove 121 is used to accommodate the portion of the heat sink 3 located between the support portion 12 and the stator 2. The portion of the heat sink 3 located between the support portion 12 and the stator 2 (e.g., is...) Figure 6 The coupling portion 32 can be at least partially embedded in the second groove 121. As a result, the contact area between the heat sink 3 and the support portion 12 is further increased, which is conducive to achieving higher heat transfer efficiency and thus optimizing the heat dissipation effect.

[0044] In some embodiments, the stator 2 has a first groove 22 opening toward the center of the hollow portion 21 on the wall forming the hollow portion 21, and the support portion 12 has a second groove 121 opening toward the wall forming the hollow portion 21 of the stator 2. The first groove 22 and the second groove 121 together form a mounting hole to accommodate the portion of the heat sink 3 located between the support portion 12 and the stator 2.

[0045] Specifically, in combination Figure 4 and Figure 5The number of first grooves 22 and second grooves 121 are both multiple, and the multiple first grooves 22 and multiple second grooves 121 correspond one-to-one. Furthermore, the opening direction of each first groove 22 is opposite to the opening direction of the corresponding second groove 121. Furthermore, the corresponding first grooves 22 and second grooves 121, in the mating state, together form a mounting hole. A portion of the inner wall of the mounting hole is formed in the stator 2, and another portion of the inner wall of the mounting hole is formed in the support portion 12. At least a portion of the heat sink 3 can extend into the mounting hole, thereby simultaneously achieving thermal coupling with both the stator 2 and the support portion 12. Simultaneously, the portion of the heat sink 3 extending into the mounting hole also serves to limit the relative movement between the support portion 12 (housing 1) and the stator 2.

[0046] In some embodiments, the cross-sectional shape of the mounting hole includes at least one apex. Thus, the mounting hole with an apex (e.g., a rectangular cross-section) and the portion of the heat sink 3 extending into the mounting hole engage, enhancing the limiting effect.

[0047] In one specific embodiment, the cross-sectional shape of the mounting hole may be, for example, rectangular. Furthermore, the cross-sectional shape of the portion of the heat sink 3 extending into the mounting hole is adapted to the cross-sectional shape of the mounting hole.

[0048] In some embodiments, the depth of the first groove 22 is less than the depth of the second groove 121. This prevents the first groove 22 from excessively occupying space on the stator 2 and affecting the strength of the stator 2.

[0049] In some embodiments, combined with Figure 2 , Figure 3 and Figure 6 The heat sink 3 includes: a heat sink 31 disposed on the second side 112 of the first wall 11; at least one coupling part 32 extending from the heat sink 31 toward the first side 111; the first wall 11 has at least one first through hole 113 extending along the first direction D1; the at least one coupling part 32 and the at least one first through hole 113 correspond one-to-one; the coupling part 32 passes through the corresponding first through hole 113 and is thermally coupled to the stator 2.

[0050] Furthermore, the coupling portion 32 is adapted to form the portion of the aforementioned heat sink 3 that extends into the mounting hole and the portion of the heat sink 3 located between the support portion 12 and the stator 2.

[0051] In some embodiments, the number of coupling portions 32 can be multiple, and each coupling portion 32 corresponds one-to-one with a plurality of mounting holes formed by the first groove 22 and the second groove 121. At least a portion of each coupling portion 32 can be accommodated in the corresponding mounting hole. Furthermore, the number of first through holes 113 can also be multiple, and each first through hole 113 corresponds one-to-one with a plurality of mounting holes. The coupling portion 32 is inserted through the corresponding first through hole 113 and stably accommodated in the corresponding mounting hole.

[0052] In some embodiments, the cross-sectional shape of the first through hole 113 is the same as the cross-sectional shape of the mounting hole.

[0053] Furthermore, the heat dissipation part 31 is located outside the housing 1, that is, on the second side 112 of the first wall 11. Heat absorbed by at least one coupling part 32 from the stator 2 can be transferred to the heat dissipation part 31, thereby dissipating the heat to the outside of the housing 1.

[0054] In some embodiments, reference Figure 6 The heat dissipation part 31 can be disc-shaped. Therefore, the heat dissipation part 31 can have a large heat dissipation surface area, thereby improving the heat dissipation efficiency of the motor 100. The heat dissipation surface can be, for example, the surface of the heat dissipation part 31 facing away from the first direction D1.

[0055] In some embodiments, the heat dissipation part 31 may be, for example, a disc or a square disc.

[0056] In some embodiments, a plurality of coupling portions 32 are spaced apart around the heat dissipation portion 31. For example, the plurality of coupling portions 32 may be arranged around the outer perimeter of the heat dissipation portion 31.

[0057] In some embodiments, along the first direction D1, the projected shape of the heat dissipation portion 31 extends beyond the outer contour of the shape jointly enclosed by the projections of the plurality of coupling portions 32. Therefore, the heat dissipation surface of the heat dissipation portion 31 can be further enlarged to improve heat dissipation efficiency.

[0058] In some embodiments, a portion of the surface of the housing 1 facing away from the first direction D1 can be recessed towards the first direction D1 to form a recessed portion, into which the heat dissipation portion 31 can be embedded. Thus, the outer surface of the housing 1 of the motor 100 is flatter, enabling it to adapt to more practical application scenarios and different installation environments.

[0059] In some embodiments, the first through hole 113 may be formed on the bottom wall of the recess facing the first direction D1 and communicate with the recess.

[0060] In some embodiments, along the first direction D1, the heat dissipation portion 31 may include a first surface 311 and a second surface 312 facing each other, wherein at least one coupling portion 32 extends from the first surface 311, and the second surface 312 has a groove structure. Thus, by providing a groove structure on the second surface 312, the heat dissipation area of ​​the heat dissipation portion 31 can be increased, allowing the heat dissipation portion 31 to fully contact and transfer heat with the medium such as air outside the housing 1, thereby dissipating heat and improving the heat dissipation efficiency of the motor 100.

[0061] In some embodiments, combined with Figures 1 to 3 The motor 100 may further include: a rotor 4, sleeved on the stator 2, the rotor 4 being able to rotate under the drive of the stator 2; wherein the rotor 4 includes: a rotor housing 41, covering the stator 2; a magnetic element 42, disposed on the inner wall of the rotor housing 41, the magnetic element 42 rotating under the drive of the stator 2 to drive the rotor housing 41 to rotate; and an output shaft 43, connected to the rotor housing 41 and moving synchronously with the rotor housing 41. Thus, the rotor 4 and the stator 2 cooperate to form an external rotor motor structure. Because the outer diameter of the rotor 4 of the motor 100 is large and the air gap between it and the stator 2 is small, higher motor efficiency can be achieved, allowing for better utilization of electrical energy and saving energy.

[0062] Furthermore, combined with Figures 1 to 4 The support portion 12 has a second through hole 122 extending along the first direction D1, and at least a portion of the output shaft 43 is rotatably disposed within the second through hole 122.

[0063] Furthermore, the motor 100 may also include a bearing structure 5, sleeved on the output shaft 43, with the outer peripheral surface of the bearing structure 5 fitting against the inner wall of the second through hole 122. The bearing structure 5 is located between the output shaft 43 and the support portion 12, and is used to realize relative rotation between the output shaft 43 and the support portion 12. Through the bearing structure 5, the rotation axis of the output shaft 43 can be stabilized, and the relative rotation between the output shaft 43 and the support portion 12 can be made smoother, reducing wear and extending service life.

[0064] Furthermore, along the first direction D1, the second through hole 122 includes a first hole segment 1221 and a second hole segment 1222 that are connected. The second hole segment 1222 is closer to the first wall 11 than the first hole segment 1221. The inner diameter of the first hole segment 1221 is larger than that of the second hole segment 1222. The support portion 12 forms a stepped structure 1223 at the junction of the walls of the first hole segment 1221 and the second hole segment 1222. The bearing structure 5 is supported on the stepped structure 1223. Furthermore, the bearing structure 5 is located within the first hole segment 1211. Thus, the bearing structure 5 and the support portion 12 can be stably connected, thereby ensuring that the rotor 4 can operate smoothly and enhancing the reliability of the motor 100.

[0065] Furthermore, the stator 2 may include: an iron core 23, comprising an annular main body 231 and at least one protruding portion 232 extending from the main body 231 in a direction away from the center; and at least one winding 24 wound around the at least one protruding portion 232. Thus, the heat generated by the winding 24, which serves as a heat source, can be transferred from the protruding portion 232 to the main body 231, and further guided out of the housing 1 by the heat sink 3.

[0066] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this disclosure, even when only a single embodiment is described with respect to a particular feature. The examples of features provided in this disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with technical features of the independent claims, and may be derived from the technical features of the respective independent claims in any suitable manner rather than solely by the specific combinations listed in the claims.

[0067] Relational terms appearing in the embodiments of this application, such as "first," "second," etc., are used only to distinguish an entity or operation from another entity or operation, without requiring or implying any actual relationship or order between these entities or operations. Furthermore, the words "comprising," "having," and "including," and other similar forms, are intended to be equivalent in meaning and are open-ended; one or more items following any of these words do not imply an exhaustive list of such items or that they are limited to only the listed items. Exemplary embodiments have been disclosed in the drawings and specification. However, many variations and modifications can be made to these embodiments. Therefore, although specific terminology is used, it is used only in a general and descriptive sense and not for limiting purposes.

[0068] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An electric machine characterized in that, Comprising: a housing (1) having a first wall (11) having opposite first and second sides (111, 112) in a first direction; a stator (2) positioned at the first side (111) of the first wall (11); a heat sink (3) at least partially thermally coupled with the stator (2) from the second side (112) through the first wall (11).

2. The electric machine of claim 1, wherein, The stator (2) comprises a hollow portion (21) into which the heat sink (3) at least partially extends.

3. The electric machine of claim 2, wherein, The wall of the stator (2) forming the hollow portion (21) is provided with a first groove (22) opening towards the center of the hollow portion (21) for accommodating the portion of the heat sink (3) extending into the hollow portion (21).

4. The electric machine of claim 2, wherein, Further comprising: a support portion (12) supported on the first side (111) and at least partially located in the hollow portion (21), the stator (2) being supported on the first side (111) by the support portion (12), wherein, in a plane perpendicular to the first direction, the heat sink (3) is at least partially located between the support portion (12) and the stator (2).

5. The electric machine of claim 4, wherein, The support portion (12) is provided with a second groove (121) opening towards the hollow portion (21) for accommodating the portion of the heat sink (3) located between the support portion (12) and the stator (2); and / or The wall of the stator (2) forming the hollow portion (21) is provided with a first groove (22) opening towards the center of the hollow portion (21), and the support portion (12) is provided with a second groove (121) opening towards the wall of the stator (2) forming the hollow portion (21), the first groove (22) and the second groove (121) together forming a mounting hole for accommodating the portion of the heat sink (3) located between the support portion (12) and the stator (2).

6. The electric machine of claim 5, wherein, The cross-sectional shape of the mounting hole comprises at least one top angle; and / or The depth of the first groove (22) is less than the depth of the second groove (121).

7. The electric machine of any of claims 1-6, wherein, The heat sink (3) comprises: a heat dissipation portion (31) disposed at the second side (112) of the first wall (11); at least one coupling portion (32) extending from the heat dissipation portion (31) towards the first side (111), the first wall (11) being provided with at least one first through hole (113) extending in the first direction, at least one coupling portion (32) corresponding to at least one first through hole (113), the coupling portion (32) passing through the corresponding first through hole (113) and being thermally coupled with the stator (2).

8. The electric machine of claim 7, wherein, The heat dissipation portion (31) is disc-shaped, and a plurality of coupling portions (32) are arranged around the heat dissipation portion (31) at intervals, and in the first direction, the projection shape of the heat dissipation portion (31) exceeds the outer contour of the shape jointly formed by the projections of the plurality of coupling portions (32); and / or In the first direction, the heat dissipation part (31) comprises opposite first and second faces (311, 312), wherein at least one of the coupling parts (32) extends from the first face (311), and the second face (312) is provided with a groove structure.

9. The electric machine of claim 1, wherein, Further comprising: a rotor (4) sleeved on the stator (2), the rotor (4) being capable of rotating under the drive of the stator (2); wherein the rotor (4) comprises: a rotor shell (41) covering the stator (2); a magnetic member (42) arranged on the inner wall of the rotor shell (41), the magnetic member (42) rotating under the drive of the stator (2) to drive the rotor shell (41) to rotate; an output shaft (43) connected to the rotor shell (41) and moving synchronously with the rotor shell (41).

10. The electric machine of claim 1, wherein, The stator (2) comprises: an iron core (23) comprising a main body portion (231) in the shape of a ring and at least one extension portion (232) extending from the main body portion (231) in a direction away from the center; at least one winding (24) wound on the at least one extension portion (232) respectively.

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