Motor

Abstract

A motor is provided. A 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; a stator assembly disposed at the radial outer side of the rotor; an impeller coupled to the rotary shaft, and disposed below the rotor; a diffuser coupled to the housing, and disposed below the impeller; 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; an elastic member disposed between the bearing holder and the housing in the axial direction; and a support damper disposed between the bearing holder and the housing in the direction perpendicular to the axial direction.

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 placed between the first bearing and the second bearing, and the impeller has a cantilever structure placed below the second bearing, so 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 that this specification seeks to solve is to provide a motor that can absorb vibration between a housing and a rotation shaft to prevent resonance and reduce noise generation.

[0012] In addition, the problem that this specification seeks to solve is to provide a motor that can prevent a support damper from rotating due to vibration of a rotation shaft and a housing.

[0013] In addition, the problem to be solved by this specification is to provide a motor that can prevent a bearing holder from rotating due to vibration of a rotation shaft and a housing.

[0014] According to an aspect of the present specification for achieving the above task, a motor may include 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 below the first bearing, a stator assembly disposed radially outside the rotor, an impeller coupled to the rotational shaft and disposed below the rotor, a diffuser coupled to the housing and disposed below 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 disposed axially between the bearing holder and the housing.

[0015] This enables vertical movement of the bearings and the rotational axis while forming outward preloads on both the first and second bearings in the axial direction. Furthermore, reliability can be ensured by setting a precise gap between the second housing and the impeller. Furthermore, while maintaining rotor balance, the bearing alignment is maintained due to the balancing effect of the elastic member, thereby extending the bearing life.

[0016] Additionally, the device may further include a support damper disposed between the bearing holder and the housing in a direction perpendicular to the axial direction.

[0017] This can absorb vibration between the housing and the rotating shaft, prevent resonance, and reduce motor noise.

[0018] Additionally, when the support damper is viewed from the upper side of the rotation axis, the support damper may be formed in a polygonal shape.

[0019] In this case, the housing is formed to be concave radially outward on an inner surface facing the first bearing and includes a plurality of first grooves spaced apart in the circumferential direction, and a protruding region protruding radially outward of the support damper can be arranged in the first groove.

[0020] This prevents the support damper from rotating due to vibration of the rotation axis and housing.

[0021] Additionally, the impeller may be positioned downstream of the flow path generated by the rotation of the impeller.

[0022] Additionally, the inner ring of the first bearing may be coupled to the rotational axis, and the outer ring of the first bearing may be supported by the bearing holder.

[0023] In addition, the bearing holder may include a first horizontal portion supporting a lower surface of an outer ring of the first bearing, a first vertical portion extending axially upward from a radially outer region of the first horizontal portion and contacting an outer surface of the outer ring of the first bearing, a second horizontal portion extending radially outward from an 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.

[0024] In this case, the housing includes a support portion extending radially inwardly from a lower region of the inner surface facing the first bearing, and a step portion formed between the support portion and the inner surface, and the upper surface of the elastic member is in contact with the lower surface of the second horizontal portion, and the lower surface of the elastic member can be in contact with the upper surface of the support portion.

[0025] In addition, the outer surface of the support damper can be in contact with the inner surface of the housing, and the lower surface of the support damper can be in contact with the upper surface of the step portion.

[0026] Additionally, the support damper can be integrally molded with the bearing holder.

[0027] Additionally, the bearing holder includes a second groove formed concavely in a radially inward direction on the outer surface and extending in the circumferential direction, and at least a portion of the support damper can be disposed in the second groove.

[0028] Additionally, the inner ring of the second bearing may be coupled to the rotation axis, and the upper surface of the second bearing may be supported by the diffuser.

[0029] Additionally, when the bearing holder is viewed from the upper side of the rotation axis, the bearing holder may be formed in a polygonal shape.

[0030] This prevents the bearing holder from rotating due to vibration of the rotating shaft and housing.

[0031] In addition, the housing may include a plurality of first grooves spaced apart from each other in a circumferential direction and formed to be concave in a radial direction on an inner surface facing the first bearing, and a protruding region protruding in a radial direction of the bearing holder may be arranged in the first groove.

[0032] Additionally, the bearing holder includes a second groove formed concavely in a radially inward direction on the outer surface and extending in a circumferential direction, and a support damper can be arranged between the second groove and the housing.

[0033] Additionally, the bearing holder may include a plurality of anti-rotation projections extending radially outward from the outer surface and spaced apart in the circumferential direction.

[0034] In addition, the housing may include a plurality of first grooves that are formed concavely radially outward on an inner surface facing the first bearing and spaced apart in the circumferential direction, and the rotation prevention protrusion may be arranged in the first grooves.

[0035] Additionally, the radially outer region of the plurality of anti-rotation protrusions may be arranged in the rotational direction of the rotation axis compared to the radially inner region.

[0036] Additionally, the upper region of the outer surface of the bearing holder may have a diameter that decreases as it goes axially upward.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In addition, the present specification can provide a motor that can absorb vibration between a housing and a rotation shaft to prevent resonance and reduce noise generation.

[0041] In addition, the present specification can provide a motor capable of preventing a support damper from rotating due to vibration of a rotation shaft and a housing.

[0042] In addition, the problem to be solved by this specification is to provide a motor that can prevent a bearing holder from rotating due to vibration of a rotation shaft and a housing.

[0043] Figure 1 is a perspective view of a motor according to the first embodiment of the present specification.

[0044] Figure 2 is an exploded perspective view of a motor according to the first embodiment of the present specification.

[0045] Figure 3 is a cross-sectional view of a motor according to the first embodiment of the present specification.

[0046] Figure 4 is an enlarged view of part A of Figure 3.

[0047] FIG. 5 is a perspective view of the upper region of a motor according to the first embodiment of the present specification.

[0048] Figure 6 is a drawing of Figure 5 with the first housing removed.

[0049] FIG. 7 is a perspective view of the upper region of a motor according to the second embodiment of the present specification.

[0050] Figure 8 is a drawing of Figure 7 with the first housing removed.

[0051] Fig. 9 is a cross-sectional view of the upper region of the motor according to the second embodiment of the present specification.

[0052] Fig. 10 is a perspective view of the upper region of a motor according to the third embodiment of the present specification.

[0053] Figure 11 is a drawing of Figure 10 with the first housing removed.

[0054] Fig. 12 is a perspective view of the upper region of the motor according to the fourth embodiment of the present specification.

[0055] Figure 13 is a drawing of Figure 12 with the first housing removed.

[0056] Fig. 14 is a cross-sectional view of the upper region of the motor according to the fifth embodiment of the present specification.

[0057] Fig. 15 is a perspective view of the upper region of the motor according to the fifth embodiment of the present specification.

[0058] Figure 16 is a drawing of Figure 15 with the first housing removed.

[0059] 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.

[0060] Fig. 1 is a perspective view of a motor according to a first embodiment of the present specification. Fig. 2 is an exploded perspective view of a motor according to a first embodiment of the present specification. Fig. 3 is a cross-sectional view of a motor according to a first embodiment of the present specification. Fig. 4 is an enlarged view of portion A of Fig. 3. Fig. 5 is a perspective view of an upper area of ​​a motor according to a first embodiment of the present specification. Fig. 6 is a view of Fig. 5 with the first housing removed.

[0061] Referring to FIGS. 1 to 6, a motor (10) according to the first 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), a support damper (1000), and a second bearing (1100). However, some of these configurations may be excluded, and additional configurations are not excluded.

[0062] 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.

[0063] 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.

[0064] 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).

[0065] The first housing (110) may include a first support portion (116) extending radially inward from a lower region of the inner surface (112) facing the first bearing (700), and a step portion (114) formed between the first support portion (116) and the inner surface (112).

[0066] The first housing (110) may include a plurality of first grooves (113) that are formed radially concavely on an inner surface (112) facing the first bearing (700) and spaced apart from each other in the circumferential direction. A protruding area (1010) of a support damper (1000) may be arranged in each of the plurality of first grooves (113). The first grooves (113) may be formed in a shape corresponding to the shape of the protruding area (1010) of the support damper (1000).

[0067] In one embodiment of the present specification, the upper part (O) of the axial direction means the 'A' direction based on FIG. 3, and the lower part (O) of the axial direction means the 'B' direction based on FIG. 3.

[0068] 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 a lower region that surrounds the impeller (500) and whose inner diameter decreases as it goes axially upward, and an upper region that is coupled to the first housing (110).

[0069] The rotation shaft (200) can be rotatably coupled to the first housing (110). The rotation shaft (200) can be rotatably coupled to the first housing (110) via a first bearing (700). The rotation shaft (200) can extend in a vertical direction. The rotation shaft (200) can be formed in a cylindrical shape. The rotation shaft (200) can rotate in one direction or the other direction by the rotation of the rotor (300). The rotation shaft (200) can be rotatably coupled to the diffuser (600). The rotation shaft (200) can be rotatably coupled to the diffuser (600) via a second bearing (1100).

[0070] The rotor (300) can be coupled to the rotation shaft (200). The rotor (300) can be positioned below 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).

[0071] 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.

[0072] The impeller (500) may be coupled to the rotation shaft (200). The impeller (500) may rotate in one direction or the other depending on the rotation of the rotation shaft (200). The impeller (500) may be disposed below the rotor (300). The impeller (500) may be disposed between the stator assembly (400) and the second bearing (1100). 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.

[0073] The diffuser (600) can be coupled to the second housing (120). The diffuser (600) can be positioned below the impeller (500). A rotational shaft (200) can be rotatably coupled to the diffuser (600).

[0074] The first bearing (700) can be coupled to the first housing (110). The first bearing (700) can be coupled to a bearing holder (800) that is 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).

[0075] The inner ring (710) of the first bearing (700) can be coupled to the outer surface of the rotation shaft (200). The outer ring (720) of the first bearing (700) can be supported by the first housing (110) via the bearing holder (800). The outer ring (720) of the first bearing (700) can be supported by the bearing holder (800). The outer surface of the outer ring (720) of the first bearing (700) is supported by the inner surface of the bearing holder (800), and the lower surface of the outer ring (720) of the first bearing (700) can be in contact with the upper surface of the first horizontal portion (810) of the bearing holder (800).

[0076] The bearing holder (800) can be placed between the first bearing (700) and the first housing (110) in a direction perpendicular to the axial direction (O) or in a horizontal direction.

[0077] The bearing holder (800) may include a first horizontal portion (810) that supports the lower surface of the outer ring (720) of the first bearing (700), a first vertical portion (820) that extends upwardly in the axial direction (O) from a radially outer region of the first horizontal portion (810) and contacts the outer surface of the outer ring (720) of the first bearing (700), a second horizontal portion (830) that extends radially outwardly from an axially upper region of the first vertical portion (820) and a second vertical portion (840) that extends downwardly in the axial direction (O) from a radially outer region of the second horizontal portion (830).

[0078] An elastic member (900) may be placed between the lower surface of the second horizontal portion (830) and the upper surface of the first support portion (116) extending radially inward from the lower surface of the inner surface (112) of the first housing (110). The outer surface of the second vertical portion (840) may face the inner surface (112) of the first housing (110).

[0079] The bearing holder (800) may include a second groove (842) that is formed concavely in a radially inward direction on the outer surface and extends in the circumferential direction. At least a portion (1020) of the support damper (1000) may be placed in the second groove (842).

[0080] An elastic member (900) may be disposed between the bearing holder (800) and the first housing (110) in the axial direction (O). 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 the circumferential direction. The upper surface of the elastic member (900) may be supported by the lower surface of the second horizontal portion (830) 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 (116) of the first housing (110). In other words, the upper surface of the elastic member (900) may be in contact with the lower surface of the second horizontal portion (830), and the lower surface of the elastic member (900) may be in contact with the upper surface of the first support portion (116).

[0081] By forming an outward preload in the axial direction on the first bearing (700) and the second bearing (1100) 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 (1100) can be enabled. Through this, an accurate gap can be set between the second housing (120) and the impeller (500), thereby ensuring reliability.

[0082] 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 (1100) is maintained due to the balancing effect of the elastic member (900), thereby increasing the durability life of the bearings (700, 1100).

[0083] The support damper (1000) can be positioned between the bearing holder (800) and the first housing (110) in a direction perpendicular to the axial direction (O) or in a horizontal direction. The support damper (1000) can be formed of an elastic material and can be implemented in a specific shape. Through this, vibrations between the housing (100) and the rotational shaft (200) can be absorbed, thereby preventing resonance and reducing noise generation from the motor (10).

[0084] The outer surface of the support damper (1000) can contact the inner surface (112) of the first housing (110), and the lower surface of the support damper (1000) can contact the upper surface of the step portion (114) of the first housing (110).

[0085] When looking at the support damper (1000) from above, or when looking at the support damper (1000) in the axial direction, or when looking at the support damper (1000) from the upper side of the rotation axis (200), the support damper (1000) can be formed in a polygonal shape. In other words, the cross-section of the support damper (1000) can be formed in a polygonal shape. In the first embodiment of the present specification, the support damper (1000) is described as being formed in a hexagonal column shape as an example, but is not limited thereto, and the shape of the support damper (1000) can be changed in various ways.

[0086] The support damper (1000) may include a protruding region (1010) that protrudes radially outward. The protruding region (1010) of the support damper (1000) may be arranged in the first groove (113) of the first housing (110). This prevents the support damper (1000) from rotating or spinning due to vibration of the rotational shaft (200) and the housing (100). Here, the protruding region (1010) of the support damper (1000) may be interpreted as meaning a vertex region on a cross-section of the support damper (1000).

[0087] The support damper (1000) may be manufactured separately from and combined with the bearing holder (800), but the support damper (1000) may also be injection-molded as an integral part of the bearing holder (800). In this case, the upper region of the support damper (1000) may cover the upper surface of the bearing holder (800) and the upper surface of the first bearing (700). At least a portion (1020) of the support damper (1000) may be placed in the second groove (842) of the bearing holder (800).

[0088] The second bearing (1100) may be coupled to the central region of the diffuser (600). A rotational shaft (200) may be rotatably coupled to the second bearing (1100). The second bearing (1100) may rotatably couple the rotational shaft (200) to the diffuser (600).

[0089] The inner ring (1110) of the second bearing (1100) may be coupled to the outer surface of the rotation shaft (200). The upper surface of the outer ring (1120) of the second bearing (1100) may be supported by the diffuser (600). Specifically, the outer ring (1120) of the second bearing (1100) may be coupled to the inner surface (602) of the diffuser (600), and the upper surface of the outer ring (1120) of the second bearing (1100) 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 surface (602) of the diffuser (600).

[0090] Fig. 7 is a perspective view of the upper region of a motor according to the second embodiment of the present specification. Fig. 8 is a drawing of Fig. 7 with the first housing removed. Fig. 9 is a cross-sectional view of the upper region of a motor according to the second embodiment of the present specification.

[0091] Referring to FIGS. 7 to 9, a motor (10) according to the second 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), a support damper (1200), and a second bearing (1100). However, some of these configurations may be excluded, and additional configurations are not excluded.

[0092] The detailed configuration of the motor (10) according to the second embodiment, which is not described below, can be understood to be the same as the configuration of the motor (10) according to the first embodiment of the present invention.

[0093] The first housing (110) may include a plurality of first grooves (113) that are formed concavely radially outward on the inner surface (112) facing the first bearing (700) and are spaced apart in the circumferential direction.

[0094] The bearing holder (800) may include a plurality of anti-rotation protrusions (850) extending radially outward from the outer surface and spaced apart from each other in the circumferential direction. Specifically, the anti-rotation protrusions (850) may extend radially outward from an upper region (802) of the outer surface of the bearing holder (800). In the second embodiment of the present specification, the number of the plurality of anti-rotation protrusions (850) is described as three as an example, but is not limited thereto and may be varied in various ways.

[0095] The anti-rotation protrusion (850) can be placed in the first groove (113) of the first housing (110). The anti-rotation protrusion (850) can be formed in a shape corresponding to the shape of the first groove (113).

[0096] The upper region (802) of the outer surface of the bearing holder (800) may have a diameter that decreases as it goes axially upward. The bearing holder (800) may include a second groove (842) that is formed concavely radially inward on the outer surface and extends in the circumferential direction. A support damper (1200) may be arranged in the second groove (842).

[0097] The support damper (1200) may be disposed between the bearing holder (800) and the first housing (110). Specifically, the support damper (1200) may be disposed between the second groove (842) of the bearing holder (800) and the first housing (110). The support damper (1200) may be formed of an elastic material. The support damper (1200) may be formed in a circular band or ring shape. The support damper (1200) may extend in the circumferential direction. Through this, vibration between the housing (100) and the rotation shaft (200) may be absorbed to prevent resonance and reduce noise generation of the motor (10).

[0098] Fig. 10 is a perspective view of the upper region of a motor according to the third embodiment of the present specification. Fig. 11 is a drawing of Fig. 10 with the first housing removed.

[0099] Referring to FIGS. 10 and 11, a motor (10) according to a third 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), a support damper (1200), and a second bearing (1100). However, some of these configurations may be excluded, and additional configurations are not excluded.

[0100] The detailed configuration of the motor (10) according to the third embodiment, which is not described below, can be understood to be the same as the configuration of the motor (10) according to the second embodiment of the present invention.

[0101] The radially outer region (854) of the anti-rotation protrusion (850) can be arranged in the rotational direction of the rotational axis (O) compared to the radially inner region (852). In other words, when the rotational axis (200) rotates counterclockwise, the radially outer region (854) of the anti-rotation protrusion (850) can be arranged counterclockwise compared to the radially inner region (852). Through this, the contact area between the anti-rotation protrusion (850) and the first housing (110) can be increased, thereby improving the durability of the anti-rotation protrusion (850).

[0102] Fig. 12 is a perspective view of the upper region of a motor according to the fourth embodiment of the present specification. Fig. 13 is a drawing of Fig. 12 with the first housing removed.

[0103] Referring to FIGS. 12 and 13, a motor (10) according to the fourth 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), a support damper (1200), and a second bearing (1100). However, some of these configurations may be excluded, and additional configurations are not excluded.

[0104] The detailed configuration of the motor (10) according to the fourth embodiment, which is not described below, can be understood to be the same as the configuration of the motor (10) according to the second embodiment of the present invention.

[0105] When looking at the bearing holder (800) from above, the bearing holder (800) may be formed in a polygonal shape. In other words, the cross-section of the bearing holder (800) may be formed in a polygonal shape. In the fourth embodiment of the present specification, the upper region of the bearing holder (800) is described as being formed in a hexagonal prism shape as an example, but the present invention is not limited thereto, and the shape of the bearing holder (800) may be variously changed. The apex region (801) of the bearing holder (800) may be arranged in the first groove (113) of the first housing (110). Through this, the bearing holder (800) may be prevented from rotating or spinning due to vibration of the rotational shaft (200) and the housing (100).

[0106] The support damper (1200) can be placed in the second groove (842) of the bearing holder (800) which is formed concavely radially inwardly below the upper region of the polygonal shape of the bearing holder (800).

[0107] Fig. 14 is a cross-sectional view of the upper region of a motor according to the fifth embodiment of the present specification. Fig. 15 is a perspective view of the upper region of a motor according to the fifth embodiment of the present specification. Fig. 16 is a drawing of Fig. 15 with the first housing removed.

[0108] Referring to FIGS. 14 to 16, a motor (10) according to the fifth 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), a support damper (1000), and a second bearing (1100). However, some of these configurations may be excluded, and additional configurations are not excluded.

[0109] The detailed configuration of the motor (10) according to the fifth embodiment, which is not described below, can be understood to be the same as the configuration of the motor (10) according to the first embodiment of the present invention.

[0110] The support damper (1000) can be positioned between the bearing holder (800) and the first housing (110) in a direction perpendicular to the axial direction (O) or in a horizontal direction. The support damper (1000) can be formed of an elastic material. Through this, vibrations between the housing (100) and the rotational shaft (200) can be absorbed, thereby preventing resonance and reducing noise generation from the motor (10).

[0111] The outer surface of the support damper (1000) can contact the inner surface (112) of the first housing (110), and the lower surface of the support damper (1000) can contact the upper surface of the step portion (114) of the first housing (110).

[0112] The support damper (1000) may be formed in an overall cylindrical shape. When looking at the support damper (1000) from above, the support damper may be formed in a circular band or ring shape.

[0113] The support damper (1000) may be manufactured separately from the bearing holder (800) and then combined, but the support damper (1000) may also be injection-molded as one piece with the bearing holder (800).

[0114] 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 below the first bearing; A stator assembly disposed radially outside the rotor; An impeller coupled to the above rotating shaft and positioned below the rotor; A diffuser coupled to the housing and positioned below 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; an elastic member disposed axially between the bearing holder and the housing; and Including a support damper arranged between the bearing holder and the housing in a direction perpendicular to the axial direction, A motor in which the support damper is formed in a polygonal shape when viewed from the upper side of the rotation axis.

2. In paragraph 1, The housing includes a plurality of first grooves spaced apart in the circumferential direction and formed concavely radially outward on an inner surface facing the first bearing, A protruding area protruding radially outwardly of the above support damper is a motor disposed in the first groove.

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

4. In paragraph 1, The inner ring of the first bearing is coupled to the rotation shaft, The outer ring of the above first bearing is a motor supported by the above bearing holder.

5. In paragraph 4, A motor in which the bearing holder includes a first horizontal portion supporting a lower surface of an outer ring of the first bearing, a first vertical portion extending axially upwardly from a radially outer region of the first horizontal portion and contacting an outer surface of the outer ring of the first bearing, a second horizontal portion extending radially outwardly from an upper region of the first vertical portion, and a second vertical portion extending axially downwardly from a radially outer region of the second horizontal portion.

6. In paragraph 5, The housing includes a support portion extending radially inward from a lower region of the inner surface facing the first bearing, and a step portion formed between the support portion and the inner surface, A motor in which the upper surface of the elastic member contacts the lower surface of the second horizontal portion, and the lower surface of the elastic member contacts the upper surface of the support portion.

7. In paragraph 6, A motor in which the outer surface of the above support damper is in contact with the inner surface of the above housing, and the lower surface of the above support damper is in contact with the upper surface of the above step portion.

8. In paragraph 1, The above support damper is a motor that is integrally injected with the bearing holder.

9. In paragraph 1, The bearing holder includes a second groove formed concavely in a radially inward direction on the outer surface and extending in the circumferential direction, A motor wherein at least a portion of the above support damper is disposed in the second groove.

10. In paragraph 1, A motor in which the inner ring of the second bearing is coupled to the rotation shaft, and the upper surface of the second bearing is supported by the diffuser.

11. 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 below the first bearing; A stator assembly disposed radially outside the rotor; An impeller coupled to the above rotating shaft and positioned below the rotor; A diffuser coupled to the housing and positioned below 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; and Including an elastic member disposed between the bearing holder and the housing in the axial direction, A motor wherein the bearing holder includes a plurality of anti-rotation projections extending radially outward from the outer surface and spaced apart in the circumferential direction.

12. In paragraph 11, The bearing holder includes a first groove formed concavely in a radially inward direction on the outer surface and extending in the circumferential direction, A motor in which a support damper is arranged between the first groove and the housing.

13. In paragraph 11, The housing is formed concavely radially outward on an inner surface facing the first bearing and includes a plurality of second grooves spaced apart in the circumferential direction, The above anti-rotation protrusion is a motor arranged in the second groove.

14. In paragraph 11, A motor in which the radially outer region of the above plurality of anti-rotation protrusions is arranged in the rotational direction of the rotation axis compared to the radially inner region.

15. In paragraph 11, The above impeller is a motor located downstream of the flow path generated by the rotation of the above impeller.

16. In paragraph 11, A motor in which the upper area of ​​the outer surface of the bearing holder has a diameter that decreases as it goes upward in the axial direction.

17. 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 below the first bearing; A stator assembly disposed radially outside the rotor; An impeller coupled to the above rotating shaft and positioned below the rotor; A diffuser coupled to the housing and positioned below 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; and Including an elastic member disposed between the bearing holder and the housing in the axial direction, A motor in which the bearing holder is formed in a polygonal shape when viewed from the upper side of the rotation axis.

18. In paragraph 17, The housing is formed concavely radially outward on an inner surface facing the first bearing and includes a plurality of grooves spaced apart in the circumferential direction, A protruding area protruding radially outwardly of the above bearing holder is a motor placed in the above groove.

Images