Motor

Abstract

A motor is provided. A motor according to an aspect of the present invention includes: a cover; a first bearing disposed on the inner side of the cover body in the radial direction; a rotating shaft rotatably coupled to the first bearing; a rotor coupled to the rotating shaft and disposed below the first bearing; a stator assembly disposed on the outside in the radial direction of the rotor; an impeller coupled to the rotating shaft and disposed below the rotor; a diffuser coupled to the cover body and disposed below the impeller; a second bearing coupled to a central region of the diffuser and to which the rotating shaft is rotatably coupled; the bearing support is arranged between the first bearing and the cover body in the radial direction; at least one part of the bottom surface of the first bearing is supported by the bearing bracket; at least a portion of a top surface of the second bearing is supported by the diffuser.

Description

motor Technical Field

[0001] The present invention relates to a motor, and more specifically, to a vacuum cleaner motor that performs cleaning by sucking in or wiping away dust or foreign matter from the area to be cleaned. Background Technology

[0002] Generally speaking, a vacuum cleaner is a household appliance that sucks in dust and other foreign objects and collects them in a separate dust collection section located inside the main body.

[0003] In detail, in order to effectively suck up foreign objects, a vacuum cleaner needs a strong suction force, which can be said to be directly proportional to the rotational force of the motor. That is, the stronger the rotational force of the motor, the faster the fan connected to the motor rotates, and thus the stronger the suction force for foreign objects.

[0004] Generally, vacuum cleaners use a motor as a device that obtains rotational power from electrical energy, consisting of a stator and a rotor. The rotor can rotate through electromagnetic interaction with the stator.

[0005] Figure 1 is a perspective view of a prior art motor. Figure 2 is a diagram showing the support method of the cantilever structure of a prior art motor.

[0006] Referring to Figures 1 and 2, a prior art vacuum cleaner motor 10 includes a first housing 11, a rotating shaft 13 rotatably coupled to the first housing 11, a rotor 14 coupled to the rotating shaft 13, a stator assembly 15 coupled to the first housing 11, an impeller 16 coupled to the lower region of the rotating shaft 13, a second housing 12 surrounding the impeller 16 and coupled to the first housing 11, and a diffuser 17 coupled to the second housing 12.

[0007] The impeller 16 is formed into a cone shape with an opening in the center. Its diameter decreases near the upper part of the axial direction. A plurality of blades protruding radially outward are formed on the radially outer side of the impeller 16.

[0008] The second cover 12 is designed such that the inner diameter of the area that overlaps with the impeller 16 radially decreases as it approaches the axial upper part, thereby enabling smooth airflow into the interior of the second cover 12.

[0009] In this case, only by forming a constant gap between the second cover 12 and the impeller 16 can the air flow be smooth while preventing the impeller 16 from colliding with the second cover 12.

[0010] However, since the rotor 14 is arranged between the first bearing 18 and the second bearing 19, and the impeller 16 has a cantilever structure arranged below the second bearing 19, it is impossible to achieve secondary pressing of the rotating shaft 13 to ensure a constant gap between the impeller 16 and the second housing 12.

[0011] Therefore, when the impeller 16 rotates at high speed, there is an interference problem between the blades of the impeller 16 and the outer peripheral surface of the second cover 12. Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] The problem to be solved by the present invention is to provide a motor that enables the vertical movement of the bearings and the rotating shaft when the first bearing and the second bearing are subjected to an outward preload on both sides of the axial direction.

[0014] In addition, the problem to be solved by the present invention is to provide a motor that can set an accurate gap between the inner circumferential surface of the second cover and the impeller blades, and can ensure reliability by maintaining a constant gap between the inner circumferential surface of the second cover and the impeller blades even at high speed.

[0015] In addition, the problem to be solved by the present invention is to provide a motor that can maintain the alignment between bearings by means of the self-aligning effect of the elastic member while maintaining the balance of the rotor, thereby extending the durability of the bearings.

[0016] In addition, the problem to be solved by the present invention is to provide a motor that can reduce the noise generated by rotor rotation by having a support structure between two bearings at both ends of the impeller.

[0017] In addition, the problem to be solved by the present invention is to provide a motor that can prevent interference between the impeller blades and the inner peripheral surface of the casing.

[0018] Technical solutions to the problem

[0019] A motor according to one aspect of the present invention for addressing the aforementioned problem includes: a housing; a first bearing disposed radially inside the housing; a rotating shaft rotatably coupled to the first bearing; a rotor coupled to the rotating shaft and disposed below the first bearing; a stator assembly disposed radially outside the rotor; an impeller coupled to the rotating shaft and disposed below the rotor; a diffuser coupled to the housing and disposed below the impeller; a second bearing coupled to the central region of the diffuser and rotatably coupled to the rotating shaft; a bearing support radially disposed between the first bearing and the housing; and an elastic member axially disposed between the bearing support and the housing.

[0020] In this case, at least a portion of the bottom surface of the first bearing can be supported by the bearing bracket, and at least a portion of the top surface of the second bearing can be supported by the diffuser.

[0021] Therefore, with the first and second bearings having a preload extending outwards axially, vertical movement of the bearings and the rotating shaft is possible. Furthermore, a precise clearance between the inner circumferential surface of the second housing and the impeller blades can be set, and this constant clearance is maintained even during high-speed operation, ensuring reliability. Moreover, while maintaining rotor balance, the self-aligning effect of the elastic members keeps the bearings aligned, thereby extending their lifespan.

[0022] Additionally, at least a portion of the rotor, at least a portion of the impeller, and at least a portion of the diffuser may be disposed between the first bearing and the second bearing.

[0023] Therefore, the noise generated by rotor rotation can be reduced by having a support structure at both ends of the impeller between two bearings.

[0024] The impeller may be located downstream of the flow path formed by the rotation of the impeller.

[0025] In addition, the inner wheel of the first bearing can be coupled to the rotating shaft, and the bottom surface of the outer wheel of the first bearing can be supported by the bearing bracket.

[0026] Additionally, the bearing bracket may include a first horizontal portion supporting the bottom surface of the outer wheel of the first bearing, a first vertical portion extending axially upward from the radially outer region of the first horizontal portion and contacting the outer peripheral surface of the outer wheel of the first bearing, a second horizontal portion extending radially outward from the upper region of the first vertical portion, and a second vertical portion extending axially downward from the radially outer region of the second horizontal portion.

[0027] Additionally, the cover may include a first support portion extending radially inward from the lower region of the inner circumferential surface of the cover facing the first bearing, and a step portion formed between the first support portion and the inner circumferential surface.

[0028] In this case, the top surface of the elastic member can contact the bottom surface of the second horizontal part, and the bottom surface of the elastic member can contact the top surface of the first support part.

[0029] In addition, the inner wheel of the second bearing can be coupled to the rotating shaft, and the top surface of the outer wheel of the second bearing can be supported by the diffuser.

[0030] Additionally, the diffuser may include a second support portion extending radially inward from the upper region of the inner circumferential surface, the top surface of the outer wheel of the second bearing may be supported by the second support portion, and the outer circumferential surface of the outer wheel of the second bearing may contact the inner circumferential surface of the diffuser.

[0031] In addition, the upper region of the impeller can directly face the stator assembly.

[0032] Additionally, the cover may include a first cover and a second cover that surrounds the impeller and is combined with the first cover. The first bearing may be disposed radially inside the inner circumferential surface of the upper region of the first cover, and the diffuser may be disposed in the lower region of the second cover.

[0033] Invention Effects

[0034] The present invention provides a motor capable of moving the bearings and the rotating shaft in the vertical direction when the first and second bearings are preloaded with outward force on both sides of the axial direction.

[0035] In addition, this invention provides a motor that can set an accurate gap between the inner circumferential surface of the second cover and the impeller blades, and ensures reliability by maintaining a constant gap between the inner circumferential surface of the second cover and the impeller blades even at high speeds.

[0036] Furthermore, this invention provides a motor that, while maintaining rotor balance, can keep bearings aligned through the self-aligning effect of elastic members, thereby extending bearing life.

[0037] In addition, the present invention provides a motor that can reduce the noise generated by rotor rotation by having a support structure at both ends of the impeller between two bearings.

[0038] In addition, the present invention provides a motor that can prevent interference between the impeller blades and the inner circumferential surface of the casing. Attached Figure Description

[0039] Figure 1 is a perspective view of a motor in the prior art.

[0040] Figure 2 is a diagram showing the support method of the cantilever structure of a prior art motor.

[0041] Figure 3 is a perspective view of a motor according to an embodiment of the present invention.

[0042] Figure 4 is an exploded perspective view of a motor according to an embodiment of the present invention.

[0043] Figure 5 is a cross-sectional view of a motor according to an embodiment of the present invention.

[0044] Figure 6 is an enlarged view of part A of Figure 5.

[0045] Figure 7 is an enlarged view of part B of Figure 5.

[0046] Figure 8 is a diagram showing the two-end support structure of a motor according to an embodiment of the present invention. Detailed Implementation

[0047] Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary accompanying drawings. When assigning reference numerals to the constituent elements of the various drawings, even if they appear in different drawings, care should be taken to assign the same reference numerals to the same constituent elements as much as possible. Furthermore, when describing embodiments of the present invention, detailed descriptions of related well-known structures or functions will be omitted if it is determined that such detailed descriptions would hinder understanding of the embodiments of the present invention.

[0048] Figure 3 is a perspective view of a motor according to an embodiment of the present invention. Figure 4 is an exploded perspective view of a motor according to an embodiment of the present invention. Figure 5 is a cross-sectional view of a motor according to an embodiment of the present invention. Figure 6 is an enlarged view of part A of Figure 5. Figure 7 is an enlarged view of part B of Figure 5. Figure 8 is a diagram showing the two-end support structures of a motor according to an embodiment of the present invention.

[0049] Referring to Figures 3 to 8, a motor 20 according to an embodiment of the present invention may include a housing 100, a rotating shaft 200, a rotor 300, a stator assembly 400, an impeller 500, a diffuser 600, a first bearing 700, a bearing support 800, an elastic member 900, and a second bearing 1000. However, it is also possible to implement the motor by excluding some of these components, and additional components are not excluded.

[0050] Motor 20 can be a suction motor for a vacuum cleaner. Motor 20 generates suction force to draw external dust into the vacuum cleaner. The detailed configuration of motor 20 can be configured to form a reverse flow path based on the rotation shaft 200. Specifically, impeller 500 can be configured downstream of the flow path generated by the rotation of impeller 500 connected to the rotation shaft 200. In other words, as impeller 500 rotates, air outside motor 20 can be drawn into the interior of motor 20, and the airflow path inside motor 20 can be formed sequentially via first housing 110, stator assembly 400, impeller 500, and diffuser 600. Therefore, compared to a motor configured with a forward flow path, the heat dissipation effect of the heat generated by the electromagnetic interaction between rotor 300 and stator assembly 400 can be improved.

[0051] The cover 100 may include a first cover 110 and a second cover 120. In one embodiment of the present invention, the case in which the first cover 110 and the second cover 120 are separated and combined is illustrated, but it is not limited thereto; the first cover 110 and the second cover 120 may also be integrally formed.

[0052] The first cover 110 may include a bearing cover with a bearing support 800 and a plurality of legs extending radially outward from the radially outer region of the bearing cover toward the axially downward portion. The plurality of legs may be circumferentially spaced. The legs of the first cover 110 may be coupled to the second cover 120. Here, the bearing cover may be referred to as the upper region of the first cover 110.

[0053] The first cover 110 may include a first support portion 114 extending radially inward from the lower region of the inner peripheral surface 112 facing the first bearing 700, and a step portion 116 formed between the first support portion 114 and the inner peripheral surface 112.

[0054] In one embodiment of the present invention, the upper or above axial direction refers to the 'A' direction based on FIG4, and the lower or below axial direction refers to the 'B' direction based on FIG4.

[0055] The second cover 120 may be coupled to the first cover 110. The second cover 120 may surround the impeller 500. The second cover 120 may be formed in the shape of a mortar. The second cover 120 may include a lower region surrounding the impeller 500 and whose inner diameter decreases towards the upper part of the axial direction, and an upper region coupled to the first cover 110.

[0056] The rotating shaft 200 can be rotatably connected to the first housing 110. The rotating shaft 200 can be rotatably connected to the first housing 110 via a first bearing 700. The rotating shaft 200 can extend in a vertical direction. The rotating shaft 200 can be formed in a cylindrical shape. The rotating shaft 200 can be rotated in one direction or another by the rotation of the rotor 300. The rotating shaft 200 can be rotatably connected to the diffuser 600. The rotating shaft 200 can be rotatably connected to the diffuser 600 via a second bearing 1000.

[0057] The rotor 300 can be coupled to the rotating shaft 200. The rotor 300 can be positioned below the first bearing 700. The rotor 300 can be positioned radially inside the stator assembly 400. The rotor 300 can face the stator assembly 400. The rotor 300 can rotate in one direction or another through electromagnetic interaction with the stator assembly 400.

[0058] The rotor 300 can be arranged axially or vertically between the first bearing 700 and the second bearing 1000. Alternatively, only a portion of the rotor 300 may be arranged axially between the first bearing 700 and the second bearing 1000.

[0059] The stator assembly 400 may be integrated with the housing 100. The stator assembly 400 may be integrated with a first housing 110 and / or a second housing 120. The stator assembly 400 may be configured within the internal space formed by the first housing 110 and the second housing 120. The stator assembly 400 may be configured radially outward of the rotor 300. The stator assembly 400 may include a stator core facing the rotor 300, coils wound around the stator core, and insulators surrounding the stator core and formed of an insulating material.

[0060] Impeller 500 can be coupled to rotating shaft 200. Impeller 500 can rotate in one direction or another by rotating rotating shaft 200. Impeller 500 can be positioned below rotor 300. Impeller 500 can be positioned between stator assembly 400 and second bearing 1000. Impeller 500 can have a smaller diameter as it moves axially upward. Impeller 500 can generally be formed into a centrally open conical shape. A plurality of impeller blades can be formed on the radially outer surface of impeller 500, protruding radially outward and spaced circumferentially.

[0061] At least a portion of the impeller 500 may be disposed between the first bearing 700 and the second bearing 1000 in the axial or vertical direction. Specifically, the central region of the impeller 500 coupled with the rotating shaft 200 may be disposed axially between the first bearing 700 and the second bearing 1000.

[0062] The second cover 120 is designed to overlap with the impeller 500 radially, meaning that the inner diameter of the second cover 120 decreases as it approaches the axial direction from its lower region, thereby allowing for smooth airflow into the second cover 120. The lower region of the second cover 120 may be shaped like a bell mouth.

[0063] In this case, in order to ensure smooth airflow while preventing collision between the impeller blades of the impeller 500 and the inner circumferential surface of the second cover 120, it is preferable to form a constant gap between the inner circumferential surface of the second cover 120 and the impeller blades of the impeller 500.

[0064] The diffuser 600 can be integrated with the second housing 120. The diffuser 600 can be positioned below the impeller 500. A rotating shaft 200 can be rotatably integrated into the diffuser 600.

[0065] At least a portion of the diffuser 600 may be disposed between the first bearing 700 and the second bearing 1000 in the axial or vertical direction. Specifically, the second support portion 604 of the diffuser 600 may be disposed axially between the first bearing 700 and the second bearing 1000.

[0066] The first bearing 700 can be disposed radially inside the first housing 110. The first bearing 700 can be disposed radially inside the upper region of the first housing 110. The first bearing 700 can be coupled to a bearing bracket 800 coupled to the central region of the bearing housing of the first housing 110. The first bearing 700 can rotatably couple a rotating shaft 200 to the first housing 110.

[0067] The inner wheel 710 of the first bearing 700 can be coupled to the outer peripheral surface of the rotating shaft 200. The outer wheel 720 of the first bearing 700 can be supported by the first cover 110 via the bearing bracket 800. The outer wheel 720 of the first bearing 700 can be supported by the bearing bracket 800. The outer peripheral surface of the outer wheel 720 of the first bearing 700 can be supported by the inner peripheral surface of the bearing bracket 800, and the bottom surface of the outer wheel 720 of the first bearing 700 can contact the top surface of the first horizontal portion 810 of the bearing bracket 800.

[0068] The bearing bracket 800 can be configured between the first bearing 700 and the first cover 110 in a direction perpendicular to the axial direction, horizontal direction, or radial direction.

[0069] The bearing support 800 may include a first horizontal portion 810 supporting the bottom surface of the outer wheel 720 of the first bearing 700, a first vertical portion 820 extending axially upward from the radially outer region of the first horizontal portion 810 and contacting the outer peripheral surface of the outer wheel 720 of the first bearing 700, a second horizontal portion 830 extending radially outward from the axially upward region of the first vertical portion 820, and a second vertical portion 840 extending axially downward from the radially outer side of the second horizontal portion 830.

[0070] An elastic member 900 may be disposed between the bottom surface of the second horizontal portion 830 and the top surface of the first support portion 114 extending radially inward from the lower part of the inner peripheral surface 112 of the first cover 110. The outer surface of the second vertical portion 840 may face the inner peripheral surface 112 of the first cover 110.

[0071] The outer surface of the second vertical portion 840 may include a groove 842 recessed radially inward. A support damper 850 may be disposed in the groove 842 of the second vertical portion 840. The support damper 850 may be formed of an elastic material. The support damper 850 may extend circumferentially. The support damper 850 may be referred to as an 'O-ring'. The support damper 850 may be disposed between the second vertical portion 840 and the inner circumferential surface 112 of the first cover 110. Vibrations between the cover and the rotating shaft can be absorbed by the support damper 850, thereby preventing resonance and reducing noise generation.

[0072] The elastic member 900 can be axially disposed between the bearing bracket 800 and the first cover 110. The elastic member 900 can be formed of an elastic material. The elastic member 900 can be a coil spring. The elastic member 900 can extend circumferentially. The top surface of the elastic member 900 can be supported by the bottom surface of the second horizontal portion 830 of the bearing bracket 800, and the bottom surface of the elastic member 900 can be supported by the top surface of the first support portion 114 of the first cover 110. In other words, the top surface of the elastic member 900 can contact the bottom surface of the second horizontal portion 830, and the bottom surface of the elastic member 900 can contact the top surface of the first support portion 114.

[0073] With the bearing support 800 and the elastic member 900, and with the first bearing 700 and the second bearing 1000 having a preload extending outward in both axial directions, vertical movement of the first bearing 700, the rotating shaft 200, and the second bearing 1000 can be achieved. This allows for setting a precise clearance between the inner circumferential surface of the second cover 120 and the blades of the impeller 500, and maintains a constant clearance even when the motor 20 is running at high speed, thus ensuring reliability. Furthermore, since the clearance between the inner circumferential surface of the second cover 120 and the impeller 500 can be set, interference between the inner circumferential surface of the second cover 120 and the blades of the impeller 500 can be prevented.

[0074] Because the elastic member 900 extends circumferentially, the first bearing 700 and the rotating shaft 200 are located radially near the center relative to the first cover 110. That is, while maintaining the balance of the rotor 300, the self-aligning effect of the elastic member 900 can keep the first bearing 700 and the second bearing 1000 aligned, thereby increasing the service life of the bearings 700 and 1000.

[0075] The second bearing 1000 can be coupled to the central region of the diffuser 600. Here, the central region of the diffuser 600 can refer to the area that overlaps with the second bearing 1000 axially or radially, with reference to the rotation shaft 200. The rotation shaft 200 can be rotatably coupled to the second bearing 1000. The second bearing 1000 can rotatably connect the rotation shaft 200 to the diffuser 600.

[0076] The inner wheel 1010 of the second bearing 1000 can be coupled to the outer peripheral surface of the rotating shaft 200. The top surface of the outer wheel 1020 of the second bearing 1000 can be supported by the diffuser 600. Specifically, the outer peripheral surface of the outer wheel 1020 of the second bearing 1000 can be coupled to the inner peripheral surface 602 of the diffuser 600, and the top surface of the outer wheel 1020 of the second bearing 1000 can contact the bottom surface of the second support portion 604 extending radially inward from the upper region of the inner peripheral surface 602 of the diffuser 600.

[0077] At least a portion of the rotor 300, at least a portion of the impeller 500, and at least a portion of the diffuser 600 can be disposed between the first bearing 700 and the second bearing 1000 in the axial direction. This allows the two ends of the impeller 500 to have a support structure between the two bearings 700 and 1000 to reduce noise generated when the rotor 300 rotates.

[0078] While embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above are exemplary in all respects and should not be construed as limiting.

Claims

1. A motor, wherein, include: Cover; The first bearing is disposed on the radial inner side of the cover; A rotating shaft is rotatably coupled to the first bearing; A rotor, coupled to the rotating shaft and disposed below the first bearing; a stator assembly, disposed radially outward of the rotor; an impeller, coupled to the rotating shaft and disposed below the rotor; a diffuser, coupled to the housing and disposed below the impeller; a second bearing, coupled to the central region of the diffuser and rotatably coupled to the rotating shaft; and a bearing support, radially disposed between the first bearing and the housing; at least a portion of the bottom surface of the first bearing is supported by the bearing support; at least a portion of the top surface of the second bearing is supported by the diffuser.

2. The motor according to claim 1, wherein, The impeller is located downstream of the flow path formed by the rotation of the impeller.

3. The motor according to claim 1, wherein, It also includes an elastic member axially disposed between the bearing support and the cover.

4. The motor according to claim 3, wherein, The inner wheel of the first bearing is coupled to the rotating shaft; the bottom surface of the outer wheel of the first bearing is supported by the bearing bracket.

5. The motor according to claim 4, wherein, The bearing bracket includes a first horizontal portion supporting the bottom surface of the outer wheel of the first bearing, a first vertical portion extending axially upward from the radially outer region of the first horizontal portion and contacting the outer peripheral surface of the outer wheel of the first bearing, a second horizontal portion extending radially outward from the upper region of the first vertical portion, and a second vertical portion extending axially downward from the radially outer region of the second horizontal portion.

6. The motor according to claim 5, wherein, The cover includes a first support portion extending radially inward from a lower region of the inner peripheral surface of the cover facing the first bearing, and a step portion formed between the first support portion and the inner peripheral surface. The top surface of the elastic member contacts the bottom surface of the second horizontal part, and the bottom surface of the elastic member contacts the top surface of the first support part.

7. The motor according to claim 1, wherein, The inner wheel of the second bearing is coupled to the rotating shaft, and the top surface of the outer wheel of the second bearing is supported by the diffuser.

8. The motor according to claim 1, wherein, The diffuser includes a second support portion extending radially inward from the upper region of the inner circumferential surface; the top surface of the outer wheel of the second bearing is supported by the second support portion, and the outer circumferential surface of the outer wheel of the second bearing is in contact with the inner circumferential surface of the diffuser.

9. The motor according to claim 1, wherein, The upper region of the impeller faces directly onto the stator assembly.

10. The motor according to claim 1, wherein, It includes a first cover and a second cover that surrounds the impeller and is combined with the first cover; the first bearing is disposed radially inside the inner circumferential surface of the upper region of the first cover; the diffuser is disposed in the lower region of the second cover.

11. A motor, wherein, include: Cover; The first bearing is disposed on the radial inner side of the cover; A rotating shaft is rotatably coupled to the first bearing; A rotor, coupled to the rotating shaft and disposed below the first bearing; a stator assembly, disposed radially outward of the rotor; an impeller, coupled to the rotating shaft and disposed below the rotor; a diffuser, coupled to the housing; a second bearing, coupled to the central region of the diffuser and rotatably coupled to the rotating shaft; and a bearing support, radially disposed between the first bearing and the housing; at least a portion of the rotor, at least a portion of the impeller, and at least a portion of the diffuser are disposed between the first bearing and the second bearing.

12. The motor according to claim 11, wherein, The impeller is located downstream of the flow path formed by the rotation of the impeller.

13. The motor according to claim 11, wherein, It also includes an elastic member axially disposed between the bearing support and the cover.

14. The motor according to claim 13, wherein, The inner wheel of the first bearing is coupled to the rotating shaft; the bottom surface of the outer wheel of the first bearing is supported by the bearing bracket.

15. The motor according to claim 14, wherein, The bearing bracket includes a first horizontal portion supporting the bottom surface of the outer wheel of the first bearing, a first vertical portion extending axially upward from the radially outer region of the first horizontal portion and contacting the outer peripheral surface of the outer wheel of the first bearing, a second horizontal portion extending radially outward from the upper region of the first vertical portion, and a second vertical portion extending axially downward from the radially outer region of the second horizontal portion.

16. The motor according to claim 15, wherein, The cover includes a first support portion extending radially inward from the lower region of the inner peripheral surface of the cover facing the first bearing, and a stepped portion formed between the first support portion and the inner peripheral surface. The top surface of the elastic member contacts the bottom surface of the second horizontal portion, and the bottom surface of the elastic member contacts the top surface of the first support portion.

17. The motor according to claim 11, wherein, The inner wheel of the second bearing is coupled to the rotating shaft, and the top surface of the outer wheel of the second bearing is supported by the diffuser.

18. The motor according to claim 11, wherein, The diffuser includes a second support portion extending radially inward from the upper region of the inner circumferential surface, the top surface of the outer wheel of the second bearing is supported by the second support portion, and the outer circumferential surface of the outer wheel of the second bearing is in contact with the inner circumferential surface of the diffuser.

19. The motor according to claim 11, wherein, The upper region of the impeller faces directly onto the stator assembly.

20. The motor according to claim 11, wherein, The cover includes a first cover and a second cover that surrounds the impeller and is combined with the first cover; the first bearing is disposed radially inside the inner circumferential surface of the upper region of the first cover; the diffuser is disposed in the lower region of the second cover.

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