Motor

Abstract

A motor is provided. The motor according to one aspect of the present specification comprises: a housing; a first bearing coupled to the housing; a rotary shaft rotatably coupled to the first bearing; a rotor coupled to the rotary shaft, and disposed below the first bearing in the axial direction; a stator assembly disposed at the radial outer side of the rotor; an impeller coupled to the rotary shaft, and disposed below the rotor in the axial direction; a diffuser coupled to the housing, and disposed below the impeller in the axial direction; a second bearing which is coupled to a central region of the diffuser, and to which the rotary shaft is rotatably coupled; a bearing holder disposed between the first bearing and the housing; and an elastic member disposed between the bearing holder and the housing in the axial direction, wherein the diffuser includes a plurality of diffuser ribs extending downward from the lower surface thereof.

Description

motor

[0001] This specification relates to a motor, and more specifically, to a motor for a vacuum cleaner that performs cleaning by sucking up or wiping away dust or foreign matter from an area to be cleaned.

[0002] In general, a vacuum cleaner is a home appliance that sucks up foreign substances such as dust and collects them in a separate dust collection unit installed inside the main body.

[0003] Specifically, vacuum cleaners require high suction power to effectively suck up foreign substances, and the strength of this suction power is proportional to the motor's rotational speed. In other words, the higher the motor's rotational speed, the faster the fan connected to the motor rotates, increasing the suction power of foreign substances.

[0004] Typically, a vacuum cleaner motor is a device that obtains rotational power from electrical energy and includes a stator and a rotor. The rotor can be rotated by electromagnetic interaction with the stator.

[0005] A conventional vacuum cleaner motor includes a rotating shaft that rotates together with a rotor, an impeller coupled to the rotating shaft, a first housing that supports a stator, and a second housing that surrounds the impeller.

[0006] In this case, the stator is arranged between the first bearing and the second bearing, and the impeller has a cantilever structure arranged axially below the second bearing, so that secondary press-fitting of the rotation shaft to secure a constant gap between the impeller and the second housing is impossible.

[0007] Due to this, there was a problem of interference between the impeller and the second housing when the impeller rotated at high speed.

[0008] The problem to be solved by this specification is to provide a motor that can enable vertical movement of a bearing and a rotational shaft while forming outward preload on both axial sides of a first bearing and a second bearing.

[0009] In addition, the problem that this specification seeks to solve is to provide a motor that can ensure reliability by being able to set an accurate gap between the second housing and the impeller.

[0010] In addition, the problem to be solved by this specification is to provide a motor that can increase the durability life of bearings by maintaining alignment between bearings due to the careful effect of an elastic member while maintaining the balance of the rotor.

[0011] In addition, the problem to be solved by this specification is to provide a motor that can reduce noise generated by rotor rotation by having an impeller having a support structure at both ends positioned between two bearings.

[0012] In addition, the problem to be solved by this specification is to provide a motor that can reduce vibration noise by reducing axial vibration of a rotating shaft and increase the threshold of dangerous speed.

[0013] In addition, the problem to be solved by this specification is to provide a motor that can reduce the amount of vibration of the housing and increase the threshold of the dangerous speed by moving the resonance point of the bending mode of the housing caused by the shape of the housing when the rotation axis rotates.

[0014] According to one aspect of the present specification for achieving the above object, a motor comprises a housing, a first bearing coupled to the housing, a rotational shaft rotatably coupled to the first bearing, a rotor coupled to the rotational shaft and disposed axially downward of the first bearing, a stator assembly disposed radially outerward of the rotor, an impeller coupled to the rotational shaft and disposed axially downward of the rotor, a diffuser coupled to the housing and disposed axially downward of the impeller, a second bearing coupled to a central region of the diffuser and to which the rotational shaft is rotatably coupled, a bearing holder disposed between the first bearing and the housing, and an elastic member axially disposed between the bearing holder and the housing.

[0015] Through this, it is possible to enable vertical movement of the bearing and the rotation axis while forming outward preload on both axial sides of the first bearing and the second bearing.

[0016] Additionally, reliability can be ensured because the exact gap between the second housing and the impeller can be set.

[0017] In addition, while maintaining the balance of the rotor, the bearing life can be extended by maintaining the alignment between bearings due to the careful effect of the elastic member.

[0018] Additionally, the impeller has a support structure at both ends positioned between two bearings, which can reduce noise generated by rotor rotation.

[0019] The above diffuser may include a plurality of diffuser ribs extending downward from the bottom.

[0020] This reduces the axial vibration of the rotating shaft, thereby reducing vibration noise and increasing the critical speed threshold of the motor.

[0021] The above impeller may be located downstream of the flow path generated by the rotation of the impeller.

[0022] Additionally, the plurality of diffuser ribs may include a plurality of first diffuser ribs extending radially and spaced apart circumferentially.

[0023] Additionally, the height of the radially inner region of the first diffuser rib may be greater than the height of the radially outer region.

[0024] Additionally, the lower surface of the first diffuser rib may be perpendicular to the rotation axis.

[0025] Additionally, the plurality of diffuser ribs may include a second diffuser rib extending circumferentially and connecting radially inner ends of the plurality of first diffuser ribs.

[0026] Additionally, the plurality of diffuser ribs may include a third diffuser rib extending in a circumferential direction and connecting the plurality of first diffuser ribs, and the third diffuser rib may be radially spaced from the second diffuser rib.

[0027] In addition, the housing includes a first housing and a second housing that surrounds the impeller and is coupled to the first housing, and the second housing includes an upper region and a lower region that is positioned axially downwards of the upper region, and the outer diameter of the lower portion of the upper region may decrease as it goes downwards in the axial direction, and the outer diameter of the upper portion of the lower region may decrease as it goes upwards in the axial direction.

[0028] In this case, a plurality of first housing ribs may be further included that protrude radially outwardly from the lower portion of the upper region and the upper portion of the lower region and are spaced apart in the circumferential direction.

[0029] This reduces the amount of vibration in the housing and shifts the resonance point of the bending mode of the housing caused by the shape of the housing when the rotation axis rotates, thereby increasing the critical speed threshold of the motor.

[0030] The plurality of first housing ribs may include vertical ribs having an outer surface parallel to the rotational axis.

[0031] Additionally, the second housing may include a coupling portion extending axially upward from the upper region and coupled with the first housing, and the plurality of first housing ribs may include inclined ribs formed in a region axially overlapping the coupling portion.

[0032] Additionally, the outer surface of the inclined rib may be inclined so as to be positioned radially outward as it goes downward in the axial direction.

[0033] Additionally, the outer surface of the first housing rib may be positioned radially inward relative to the outermost surface of the second housing.

[0034] Additionally, it may further include a second housing rib extending in the circumferential direction and connecting the plurality of first housing ribs.

[0035] According to the present specification, a motor can be provided that enables vertical movement of a bearing and a rotational shaft while forming an outward preload on both sides of the first bearing and the second bearing in the axial direction.

[0036] Additionally, since the specification allows for setting an accurate gap between the second housing and the impeller, a motor capable of ensuring reliability can be provided.

[0037] In addition, the present specification provides a motor that can maintain alignment between bearings due to the care effect of an elastic member while maintaining the balance of the rotor, thereby increasing the durability life of the bearings.

[0038] In addition, the present specification provides a motor capable of reducing noise generated by rotor rotation by having an impeller having a support structure at both ends positioned between two bearings.

[0039] In addition, the present specification provides a motor capable of reducing vibration noise by reducing axial vibration of a rotating shaft and increasing a threshold of a dangerous speed.

[0040] In addition, the present specification provides a motor capable of reducing the amount of vibration of the housing and increasing the threshold of the dangerous speed by shifting the resonance point of the bending mode of the housing caused by the shape of the housing when the rotation axis rotates.

[0041] FIG. 1 is a perspective view of a motor according to one embodiment of the present specification.

[0042] Figure 2 is an exploded perspective view of a motor according to one embodiment of the present specification.

[0043] Figure 3 is a cross-sectional view of a motor according to one embodiment of the present specification.

[0044] FIG. 4 is a perspective view of a second housing of a motor according to one embodiment of the present specification.

[0045] FIG. 5 is a drawing showing a bending mode of a housing of a motor according to one embodiment of the present specification.

[0046] Figure 6 is a diagram showing the frequency of the housing according to the rotational speed of the impeller when there are no ribs.

[0047] FIG. 7 is a diagram showing the frequency of the housing according to the rotational speed of the impeller of the motor according to one embodiment of the present specification.

[0048] FIG. 8 is a perspective view of a modified example of a motor according to one embodiment of the present specification.

[0049] FIG. 9 is a perspective view of a diffuser of a motor according to one embodiment of the present specification.

[0050] FIG. 10 is a drawing showing an axial excitation mode of a housing of a motor according to one embodiment of the present specification.

[0051] FIG. 11 is a diagram showing the frequency of the housing according to the rotational speed of the impeller of the motor according to one embodiment of the present specification.

[0052] Hereinafter, some embodiments of the present specification will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given the same reference numerals even if they are shown in different drawings. In addition, when describing embodiments of the present specification, if a detailed description of a related known configuration or function is judged to hinder understanding of the embodiments of the present specification, the detailed description will be omitted.

[0053] FIG. 1 is a perspective view of a motor according to one embodiment of the present disclosure. FIG. 2 is an exploded perspective view of a motor according to one embodiment of the present disclosure. FIG. 3 is a cross-sectional view of a motor according to one embodiment of the present disclosure. FIG. 4 is a perspective view of a second housing of a motor according to one embodiment of the present disclosure. FIG. 5 is a diagram showing a bending mode of a housing of a motor according to one embodiment of the present disclosure. FIG. 6 is a diagram showing a frequency of a housing according to a rotational speed of an impeller in the absence of ribs. FIG. 7 is a diagram showing a frequency of a housing according to a rotational speed of an impeller of a motor according to one embodiment of the present disclosure. FIG. 8 is a perspective view of a modified example of a motor according to one embodiment of the present disclosure. FIG. 9 is a perspective view of a diffuser of a motor according to one embodiment of the present disclosure. FIG. 10 is a diagram showing an axial excitation mode of a housing of a motor according to one embodiment of the present disclosure. FIG. 11 is a diagram showing a frequency of a housing according to a rotational speed of an impeller of a motor according to one embodiment of the present disclosure.

[0054] Referring to FIGS. 1 to 4, a motor (10) according to one embodiment of the present specification may include a housing (100), a rotation shaft (200), a rotor (300), a stator assembly (400), an impeller (500), a diffuser (600), a first bearing (700), a bearing holder (800), an elastic member (900), and a second bearing (1000). However, some of these configurations may be excluded, and additional configurations are not excluded.

[0055] The motor (10) may be a suction motor used in a vacuum cleaner. The motor (10) may generate suction force to cause external dust to be introduced into the vacuum cleaner. The arrangement of the detailed configuration of the motor (10) may be arranged to form a reverse flow path based on the rotation shaft (200). Specifically, the impeller (500) may be arranged downstream of the flow path generated by the rotation of the impeller (500) coupled to the rotation shaft (200). In other words, air outside the motor (10) is sucked into the inside of the motor (10) according to the rotation of the impeller (500), and the flow path through which the air flows inside the motor (10) may be formed by sequentially passing through the first housing (110), the stator assembly (400), the impeller (500), and the diffuser (600). Through this, the heat dissipation effect for heat generated due to electromagnetic interaction between the rotor (300) and the stator assembly (400) can be improved compared to a motor arranged in a forward flow path.

[0056] The housing (100) may include a first housing (110) and a second housing (120). In one embodiment of the present specification, the first housing (110) and the second housing (120) are described as being separately coupled, but the present invention is not limited thereto and the first housing (110) and the second housing (120) may be formed integrally.

[0057] The first housing (110) may include a bearing housing in which a bearing holder (800) is arranged, and a plurality of legs extending axially downward from a radially outer region of the bearing housing. The plurality of legs may be spaced apart from each other in the circumferential direction. The legs of the first housing (110) may be coupled to the second housing (120). Here, the bearing housing may be referred to as the upper region of the first housing (110).

[0058] The first housing (110) may include a first support portion extending radially inward from a lower region of the inner surface facing the first bearing (700), and a step portion formed between the first support portion and the inner surface.

[0059] In one embodiment of the present specification, the axial upper part or above means the 'A' direction based on FIGS. 1 to 3, and the axial lower part or below means the 'B' direction based on FIG. 4.

[0060] The second housing (120) can be coupled to the first housing (110). The second housing (120) can surround the impeller (500). The second housing (120) can be formed in a spherical shape. The second housing (120) can include an upper region (122) coupled to the first housing (110) and a lower region (124) that surrounds the impeller (500) and has an inner diameter that decreases as it goes upward in the axial direction.

[0061] The outer diameter of the lower portion of the upper region (122) of the second housing (120) may decrease as it goes downward in the axial direction. The outer diameter of the upper portion of the lower region (124) of the second housing (120) may decrease as it goes upward in the axial direction.

[0062] The second housing (120) may include a coupling portion (121) extending axially upward from the upper region (122) and coupled with the first housing (110). The coupling portion (121) may be coupled with a leg portion of the first housing (110). The coupling portion (121) may include a plurality of coupling portions (121) spaced apart in the circumferential direction.

[0063] The rotational shaft (200) can be rotatably coupled to the first housing (110). The rotational shaft (200) can be rotatably coupled to the first housing (110) via a first bearing (700). The rotational shaft (200) can extend in a vertical direction. The rotational shaft (200) can be formed in a cylindrical shape. The rotational shaft (200) can rotate in one direction or the other direction by the rotation of the rotor (300). The rotational shaft (200) can be rotatably coupled to the diffuser (600). The rotational shaft (200) can be rotatably coupled to the diffuser (600) via a second bearing (1000).

[0064] The rotor (300) can be coupled to the rotation shaft (200). The rotor (300) can be positioned axially downward of the first bearing (700). The rotor (300) can be positioned radially inward of the stator assembly (400). The rotor (300) can face the stator assembly (400). The rotor (300) can rotate in one direction or the other by electromagnetic interaction with the stator assembly (400).

[0065] The stator assembly (400) can be coupled to the housing (100). The stator assembly (400) can be coupled to the first housing (110) and / or the second housing (120). The stator assembly (400) can be disposed in an internal space created by the first housing (110) and the second housing (120). The stator assembly (400) can be disposed radially outside the rotor (300). The stator assembly (400) can include a stator core facing the rotor (300), a coil wound around the stator core, and an insulator formed of an insulating material and surrounding the stator core.

[0066] The impeller (500) may be coupled to the rotation shaft (200). The impeller (500) may rotate in one direction or the other direction depending on the rotation of the rotation shaft (200). The impeller (500) may be disposed axially below the rotor (300). The impeller (500) may be disposed between the stator assembly (400) and the second bearing (1000). The diameter of the impeller (500) may decrease as it goes upward in the axial direction. The impeller (500) may be formed in a conical shape with an open center overall. A plurality of impeller blades may be formed on the radially outer surface of the impeller (500) to protrude radially outward and be spaced apart from each other in the circumferential direction.

[0067] The diffuser (600) can be coupled to the second housing (120). The diffuser (600) can be positioned axially downwards of the impeller (500). A rotational shaft (200) can be rotatably coupled to the diffuser (600).

[0068] The diffuser (600) may include a second bearing (1000), a body (610) to which a rotation shaft (200) is coupled, and a plurality of guide vanes (620) formed on the outer surface of the body (610) and spaced apart in the circumferential direction. Through the guide vanes (620), the efficiency of air flow by the impeller (500) can be improved.

[0069] The first bearing (700) can be coupled to the first housing (110). The first bearing (700) can be coupled to an upper region of the first housing (110). The first bearing (700) can be coupled to a bearing holder (800) coupled to a central region of the bearing housing of the first housing (110). The first bearing (700) can rotatably couple the rotation shaft (200) to the first housing (110).

[0070] The inner ring of the first bearing (700) can be coupled to the outer surface of the rotation shaft (200). The outer ring of the first bearing (700) can be supported by the first housing (110) through the bearing holder (800). The outer ring of the first bearing (700) can be supported by the bearing holder (800). The outer surface of the outer ring of the first bearing (700) is supported by the inner surface of the bearing holder (800), and the lower surface of the outer ring of the first bearing (700) can be in contact with the upper surface of the first horizontal portion of the bearing holder (800).

[0071] The bearing holder (800) can be positioned between the first bearing (700) and the first housing (110) in a direction perpendicular to the axial direction, horizontally, or radially.

[0072] The bearing holder (800) may include a first horizontal portion supporting the lower surface of the outer ring of the first bearing (700), a first vertical portion extending axially upward from a radially outer region of the first horizontal portion and contacting the outer surface of the outer ring of the first bearing (700), a second horizontal portion extending radially outward from an axially upper region of the first vertical portion, and a second vertical portion extending axially downward from a radially outer region of the second horizontal portion.

[0073] An elastic member (900) may be placed between the lower surface of the second horizontal portion and the upper surface of the first support portion extending radially inward from the lower surface of the inner surface of the first housing (110). The outer surface of the second vertical portion may face the inner surface of the first housing (110).

[0074] An elastic member (900) may be arranged axially between the bearing holder (800) and the first housing (110). The elastic member (900) may be formed of an elastic material. The elastic member (900) may be a coil spring. The elastic member (900) may extend in a circumferential direction. The upper surface of the elastic member (900) may be supported by the lower surface of the second horizontal portion of the bearing holder (800), and the lower surface of the elastic member (900) may be supported by the upper surface of the first support portion of the first housing (110).

[0075] By forming an outward preload on both sides of the first bearing (700) and the second bearing (1000) through the bearing holder (800) and the elastic member (900), vertical movement of the first bearing (700), the rotation shaft (200), and the second bearing (1000) can be enabled. Through this, an accurate gap can be set between the second housing (120) and the impeller (500), thereby ensuring reliability.

[0076] Since the elastic member (900) extends in the circumferential direction, the first bearing (700) and the rotation shaft (200) are positioned radially centered with respect to the first housing (110). That is, while maintaining the balance of the rotor (300), the alignment between the first bearing (700) and the second bearing (1000) is maintained due to the balancing effect of the elastic member (900), thereby increasing the durability life of the bearings (700, 1000).

[0077] The second bearing (1000) can be coupled to the central region of the diffuser (600). A rotational shaft (200) can be rotatably coupled to the second bearing (1000). The second bearing (1000) can rotatably couple the rotational shaft (200) to the diffuser (600).

[0078] The inner ring of the second bearing (1000) may be coupled to the outer circumferential surface of the rotation shaft (200). The upper surface of the outer ring of the second bearing (1000) may be supported by the diffuser (600). Specifically, the outer ring of the second bearing (1000) may be coupled to the inner circumferential surface (602) of the diffuser (600), and the upper surface of the outer ring of the second bearing (1000) may be in contact with the lower surface of the second support portion (604) that extends radially inward from an upper region of the inner circumferential surface (602) of the diffuser (600).

[0079] Referring to FIGS. 4, 8, and 9, the second housing (120) and the diffuser (600) may include a plurality of ribs (128, 129, 614, 616, 618). This will be described in detail below.

[0080] Referring to FIG. 4, the second housing (120) may include a first housing rib (128). The first housing rib (128) may protrude radially outward from the lower portion of the upper region (120) and the upper portion of the lower region (124) of the second housing (120). Here, the region where the lower portion of the upper region (120) and the upper portion of the lower region (124) are connected may be referred to as a connecting region (126).

[0081] The outer surface of the first housing rib (128) may be positioned radially inward relative to the outermost surface of the second housing (120). The first housing rib (128) may include a plurality of first housing ribs (128) spaced apart in the circumferential direction.

[0082] The first housing rib (128) may include a vertical rib (1284) whose outer surface extends axially or vertically. The outer surface of the vertical rib (1284) may be parallel to the axis of rotation (200). The vertical rib (1284) may include a plurality of vertical ribs (1284) spaced apart in the circumferential direction.

[0083] The first housing rib (128) may include an inclined rib (1282) formed in an area overlapping the joint (121) in an axial or vertical direction. The outer surface of the inclined rib (1282) may be inclined so as to be positioned radially outward as it goes downward in the axial direction. The inclined rib (1282) may include a plurality of inclined ribs (1282) spaced apart in the circumferential direction.

[0084] The vertical ribs (1284) and the inclined ribs (1282) can be positioned alternately in the circumferential direction.

[0085] Referring to FIG. 5, when the motor (10) is in operation, it can be seen that the second housing (120) bends due to the spherical shape of the second housing (120) as the rotation shaft (200), the rotor (300), and the impeller (500) rotate. Specifically, when the rotation shaft (200) rotates at high speed, the area where the first housing (110) is located in the axial direction generates less radial vibration due to the support of the first bearing (700). On the other hand, the area where the impeller (500) is located generates severe radial vibration due to centrifugal force. As a result, it can be seen that the connection area (126) of the second housing (120) is formed in a structure with a narrow radial width, a so-called neck-like structure, so that a distortion phenomenon of radial bending occurs.

[0086] Referring to Fig. 6, in a typical motor without housing ribs, the change in the frequency of the housing according to the rotational speed of the impeller can be seen. In this case, it can be seen that the resonance point (P1) of the bending mode of the housing (100) caused by the shape of the housing when the rotation axis (200) rotates is formed at 2100 Hz.

[0087] Referring to FIG. 7, when the motor (10) according to one embodiment of the present specification operates, it can be seen that the frequency of the second housing (120) changes according to the rotational speed of the impeller (500). In this case, it can be seen that the resonance point (P2) of the bending mode of the second housing (120) generated due to the shape of the second housing (120) when the rotation shaft (200) rotates moves to 2450 Hz. That is, when the first housing rib (128) is present, the resonance point of the bending mode of the second housing (120) can be moved to increase the critical speed threshold of the motor (10). In addition, the rigidity of the second housing (120) can be improved and the amount of vibration of the second housing (120) can be reduced.

[0088] Referring to FIG. 8, the second housing (120) may include a second housing rib (129). The second housing rib (129) may extend in a circumferential direction. The second housing rib (129) may connect a plurality of first housing ribs (128). The second housing rib (129) may be arranged radially inward from the radially outermost surface of the second housing (120). The rigidity of the second housing (120) may be further improved through the second housing rib (129).

[0089] Referring to FIG. 9, the diffuser (600) may include a first diffuser rib (614), a second diffuser rib (616), and a third diffuser rib (618). The first diffuser rib (614), the second diffuser rib (616), and the third diffuser rib (618) may extend downward from the lower surface (612) of the body (610) of the diffuser (600).

[0090] The first diffuser rib (614) may extend radially. The first diffuser rib (614) may include a plurality of first diffuser ribs (614) spaced apart from each other in the circumferential direction. The height of the radially inner region of the first diffuser rib (614) may be greater than the height of the radially outer region. The lower surface of the first diffuser rib (614) may be perpendicular to the rotational axis (200).

[0091] The second diffuser rib (616) may extend in the circumferential direction. The second diffuser rib (616) may connect the radially inner ends of a plurality of first diffuser ribs (614).

[0092] The third diffuser rib (618) may extend in the circumferential direction. The third diffuser rib (618) may connect a plurality of first diffuser ribs (614). The third diffuser rib (618) may be radially spaced from the second diffuser rib (616). The third diffuser rib (618) may be arranged radially outside the second diffuser rib (616).

[0093] Referring to FIG. 10, it can be seen that when the motor (10) operates, axial vibration occurs in the second housing (120) as the rotation shaft (200), the rotor (300), and the impeller (500) rotate.

[0094] Referring to FIG. 11, when the motor (10) according to one embodiment of the present specification operates, it is possible to see the change in the frequency of the second housing (120) according to the rotational speed of the impeller (500).

[0095] In this case, it can be seen that the axial excitation mode resonance point (P3) of the second housing (120) exists at 2200 Hz. That is, when the first diffuser rib (614), the second diffuser rib (616), and the third diffuser rib (618) exist, the resonance point of the axial excitation mode of the second housing (120) can be moved to increase the critical speed threshold of the motor (10). In addition, the strength of the diffuser (600) can be increased, and the axial vibration of the rotation shaft (200) connected to the diffuser (600) can be reduced, thereby reducing vibration noise.

[0096] Although the embodiments of this specification have been described with reference to the attached drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical concept or essential features thereof. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

Claims

1. Housing; A first bearing coupled to the housing; A rotary shaft rotatably coupled to the first bearing; A rotor coupled to the above rotational axis and positioned axially downward of the first bearing; A stator assembly disposed radially outside the rotor; An impeller coupled to the above rotational axis and positioned below in the axial direction of the rotor; A diffuser coupled to the housing and positioned axially downwardly of the impeller; A second bearing coupled to the central region of the diffuser and rotatably coupled to the rotation axis; A bearing holder disposed between the first bearing and the housing in a direction perpendicular to the axial direction; and Including an elastic member disposed between the bearing holder and the housing in the axial direction, The above diffuser is a motor including a plurality of diffuser ribs extending downward from the bottom.

2. In paragraph 1, The above impeller is a motor located downstream of the flow path generated by the rotation of the above impeller.

3. In paragraph 1, A motor including a plurality of first diffuser ribs extending radially and spaced apart from each other in the circumferential direction, wherein the plurality of diffuser ribs are formed in a radial direction.

4. In paragraph 3, A motor in which the height of the radially inner region of the first diffuser rib is greater than the height of the radially outer region.

5. In paragraph 3, A motor whose lower surface of the first diffuser rib is perpendicular to the rotation axis.

6. In paragraph 3, A motor including a plurality of diffuser ribs extending in a circumferential direction and a second diffuser rib connecting radially inner ends of the plurality of first diffuser ribs.

7. In paragraph 6, The plurality of diffuser ribs include a third diffuser rib extending in the circumferential direction and connecting the plurality of first diffuser ribs, The above third diffuser rib is a motor radially spaced from the above second diffuser rib.

8. In paragraph 1, The housing comprises a first housing and a second housing surrounding the impeller and coupled to the first housing, The second housing includes an upper region and a lower region disposed axially below the upper region, The lower part of the upper region has an outer diameter that decreases as it goes down in the axial direction, A motor in which the outer diameter of the upper portion of the above lower region decreases as it goes upward in the axial direction.

9. In paragraph 8, A motor further comprising a plurality of first housing ribs protruding radially outwardly from the lower portion of the upper region and the upper portion of the lower region and spaced apart in the circumferential direction.

10. In paragraph 9, A motor wherein the plurality of first housing ribs include vertical ribs whose outer surfaces are parallel to the rotation axis.

11. In paragraph 9, The second housing extends axially upward in the upper region and includes a coupling portion coupled with the first housing, A motor in which the plurality of first housing ribs include inclined ribs formed in an area axially overlapping the coupling portion.

12. In paragraph 11, A motor in which the outer surface of the above-mentioned inclined rib is inclined so as to be positioned radially outward as it goes downward in the axial direction.

13. In paragraph 9, A motor in which the outer surface of the first housing rib is positioned radially inward relative to the outermost surface of the second housing.

14. In paragraph 9, A motor further comprising a second housing rib extending in a circumferential direction and connecting the plurality of first housing ribs.

15. 1st housing; A first bearing coupled to the first housing; A rotary shaft rotatably coupled to the first bearing; A rotor coupled to the above rotational axis and positioned axially downward of the first bearing; A stator assembly disposed radially outside the rotor; An impeller coupled to the above rotational axis and positioned below in the axial direction of the rotor; A second housing surrounding the impeller and coupled to the first housing; A diffuser coupled to the second housing and positioned axially downwardly of the impeller; A second bearing coupled to the central region of the diffuser and rotatably coupled to the rotation axis; A bearing holder disposed between the first bearing and the first housing; An elastic member disposed axially between the bearing holder and the first housing; and It includes a plurality of housing ribs that protrude radially outward from the outer surface of the second housing, The second housing includes an upper region and a lower region disposed axially below the upper region, The lower part of the upper region has an outer diameter that decreases as it goes down in the axial direction, The upper part of the above lower region has an outer diameter that decreases as it goes upward in the axial direction, A motor in which the plurality of housing ribs are arranged on the lower part of the upper region and the upper part of the lower region.

16. In paragraph 15, A motor wherein the plurality of housing ribs include a plurality of first housing ribs spaced apart in the circumferential direction.

17. In paragraph 16, A motor wherein the plurality of first housing ribs include vertical ribs whose outer surfaces are parallel to the rotation axis.

18. In paragraph 16, The second housing extends axially upward in the upper region and includes a coupling portion coupled with the first housing, A motor in which the plurality of first housing ribs include inclined ribs formed in an area axially overlapping the coupling portion.

19. In paragraph 18, A motor in which the outer surface of the above-mentioned inclined rib is inclined so as to be positioned radially outward as it goes downward in the axial direction.

20. In paragraph 16, A motor wherein the plurality of housing ribs further include a second housing rib extending in a circumferential direction and connecting the plurality of first housing ribs.

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