Motor

Abstract

A vacuum cleaner is provided. A motor according to one aspect of the present specification comprises: a rotary shaft; a rotor coupled to the rotary shaft; a stator core disposed outside the rotor in a radial direction; an insulator coupled to the stator core; a housing coupled to the insulator and surrounding the stator core; an impeller coupled to an upper region of the rotary shaft in an axial direction; an impeller cover coupled to the housing and surrounding the impeller; and a coupling member for coupling the housing and the impeller cover. In this case, the housing includes an upper housing and a lower housing spaced apart from the upper housing in the axial direction, the impeller cover includes an upper impeller cover and a lower impeller cover disposed below the upper impeller cover in the axial direction, and the coupling member may be coupled to the upper impeller cover by sequentially passing through the lower housing, the upper housing, and the lower impeller cover. Accordingly, deformation of the impeller cover occurring during operation of the motor can be reduced, and flow path performance can be improved.

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, an impeller cover that surrounds the impeller, and a housing that supports a stator.

[0006] In this case, there was a problem that the impeller cover was deformed when the motor was driven due to the combination of the radial outer area of ​​the impeller cover and the housing, resulting in a decrease in space efficiency.

[0007] The problem that this specification seeks to solve is to provide a motor that can reduce deformation of an impeller cover that occurs during motor operation and improve euro performance.

[0008] In addition, the problem that this specification seeks to solve is to provide a motor that can improve space efficiency.

[0009] According to one aspect of the present specification for achieving the above object, a motor includes a rotation shaft, a rotor coupled to the rotation shaft, a stator core disposed radially outside the rotor, an insulator coupled to the stator core, a housing coupled to the insulator and surrounding the stator core, an impeller coupled to an axial upper region of the rotation shaft, an impeller cover coupled to the housing and surrounding the impeller, and a coupling member coupling the housing and the impeller cover.

[0010] In this case, the housing includes an upper housing and a lower housing spaced apart from the upper housing in the axial direction, the impeller cover includes an upper impeller cover and a lower impeller cover disposed axially lower than the upper impeller cover, and the joining member can be joined to the upper impeller cover by sequentially penetrating the lower housing, the upper housing, and the lower impeller cover.

[0011] Through this, deformation of the impeller cover that occurs during motor operation can be reduced and euro performance can be improved.

[0012] In addition, the upper impeller cover is formed such that the inner diameter of the lower region is smaller than the inner diameter of the upper region, the lower impeller cover is formed such that the inner diameter of the upper region is smaller than the inner diameter of the lower region, and the joining member can be joined to the lower region of the upper impeller cover and the upper region of the lower impeller cover.

[0013] In this case, the upper impeller cover has a diameter that decreases as it goes downward in the axial direction, the lower impeller cover has a diameter that decreases as it goes upward in the axial direction, and the joining member can penetrate an area adjacent to the upper surface of the lower impeller cover and be joined to an area adjacent to the lower surface of the upper impeller cover.

[0014] This can improve the space efficiency of the motor.

[0015] Additionally, the upper impeller cover includes a mounting portion extending axially downward from a radially outer surface of a region adjacent to the lower surface, and the joining member can be joined to the mounting portion.

[0016] In addition, the upper housing includes a first annular body portion arranged axially upper portion of the stator core, and a first leg portion extending axially from a radially outer side of the first body portion, the first leg portion being penetrated by the connecting member, and an upper surface of the first leg portion being able to be seated on a lower surface of the mounting portion.

[0017] In addition, the above-mentioned fixing portion may be formed concavely from the bottom to the top, and may include a fixing groove in which the upper surface of the first leg portion is fixed.

[0018] Additionally, the upper region of the first leg portion may include a first guide portion formed to have a smaller diameter than other regions, and an adjacent region of the upper surface of the lower impeller cover may include a first hole penetrated by the first guide portion and a second hole penetrated by the other region of the first leg portion.

[0019] Additionally, the axial height of the region adjacent to the rotation axis among the first guide portions may be smaller than the axial height of the region far from the rotation axis.

[0020] Additionally, the lower surface of the upper impeller cover may include a first step portion, and the upper surface of the lower impeller cover that comes into contact with the lower surface of the upper impeller cover may include a second step portion formed in a shape complementary to the first step portion.

[0021] Additionally, the inner diameter of the upper region of the upper impeller cover may be larger than the inner diameter of the lower region of the lower impeller cover.

[0022] In addition, the stator core includes a vertical groove formed concavely in a radially inward direction on a radially outer surface and extending in the axial direction, and the coupling member can be arranged radially adjacent to the vertical groove.

[0023] In addition, the insulator includes a first region disposed axially upper portion of the stator core, a second region disposed axially lower portion of the stator core, and a third region connecting the first region and the second region, and the upper housing includes an annular first body portion disposed axially upper portion of the first region, and a first leg portion extending vertically from a radially outer side of the first body portion, and a lower region of the first leg portion can be coupled to the first region.

[0024] Additionally, the first region may be formed concavely from the radially outer surface to the radially inner surface, and may include a first joining groove to which the radially inner region of the first leg portion is joined.

[0025] In addition, the first leg portion includes a second coupling groove that is formed concavely from the radially inner side to the radially outer side of the lower surface, and a first surface facing the radially inner side of the second coupling groove contacts the outer surface of the stator core, and a second surface facing the axially lower side of the second coupling groove can contact the upper surface of the stator core.

[0026] In addition, the stator core may include a vertical groove formed concavely in a radially inward direction on a radially outer surface and extending in the axial direction, and the first surface of the second coupling groove may include a protrusion that protrudes in a radially inward direction and is arranged in the vertical groove.

[0027] In addition, the lower housing includes a second body portion having an annular shape disposed axially lower in the second region, and a second leg portion extending axially upward from a radially outer side of the second body portion, the second region including a second engaging groove formed concavely radially inward on a radially outer surface and to which a radially inner region of the second leg portion is engaged, and an upper surface of the second leg portion can contact an axial lower surface of the stator core.

[0028] Additionally, the impeller may be positioned downstream of the flow path generated by the rotation of the impeller.

[0029] Through this specification, a motor can be provided that can reduce deformation of an impeller cover that occurs during motor operation and improve euro performance.

[0030] Additionally, the present specification can provide a motor that can improve space efficiency.

[0031] Figures 1 and 2 are perspective views of a motor according to one embodiment of the present specification.

[0032] Figure 3 is an exploded perspective view of a motor according to one embodiment of the present specification.

[0033] Figure 4 is a cross-sectional view of a motor according to one embodiment of the present specification.

[0034] FIGS. 5 and 6 are perspective views of some configurations of a motor according to one embodiment of the present specification.

[0035] FIG. 7 is a front view of an impeller cover of a motor according to one embodiment of the present specification.

[0036] FIG. 8 is a cross-sectional view of an impeller cover of a motor according to one embodiment of the present specification.

[0037] FIG. 9 is a perspective view of a lower impeller cover of a motor according to one embodiment of the present specification.

[0038] FIG. 10 is a perspective view of an upper impeller cover of a motor according to one embodiment of the present specification.

[0039] Figures 11 and 12 are perspective views of the upper housing of a motor according to one embodiment of the present specification.

[0040] Figure 13 is a front view of the upper housing of a motor according to one embodiment of the present specification.

[0041] FIG. 14 is a perspective view of an insulator of a motor according to one embodiment of the present specification.

[0042] FIG. 15 is a perspective view of a stator core of a motor according to one embodiment of the present specification.

[0043] FIG. 16 is a perspective view of the lower housing of a motor according to one embodiment of the present specification.

[0044] FIG. 17 is a drawing showing deformation of an impeller cover according to operation of a motor according to one embodiment of the present specification.

[0045] Fig. 18 is a drawing showing deformation of an impeller cover according to operation of a motor according to a prior art.

[0046] Hereinafter, the embodiments disclosed in this disclosure will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers and redundant descriptions thereof will be omitted.

[0047] However, the technical idea of ​​this specification is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​this specification, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0048] In addition, terms (including technical and scientific terms) used in the embodiments of this specification may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which this specification pertains, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0049] Additionally, the terms used in the embodiments of this specification are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0050] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0051] Additionally, in describing components of embodiments of the present specification, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

[0052] And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, it may include not only cases where the component is 'connected', 'coupled', or 'connected' directly to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.

[0053] Additionally, when described as being formed or arranged "above" or "below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," the meaning may include not only the upward direction but also the downward direction based on one component.

[0054] Meanwhile, the term "discloser" can be replaced with terms such as "document," "specification," and "description."

[0055] FIG. 1 and FIG. 2 are perspective views of a motor according to an embodiment of the present disclosure. FIG. 3 is an exploded perspective view of a motor according to an embodiment of the present disclosure. FIG. 4 is a cross-sectional view of a motor according to an embodiment of the present disclosure. FIG. 5 and FIG. 6 are perspective views of some components of a motor according to an embodiment of the present disclosure. FIG. 7 is a front view of an impeller cover of a motor according to an embodiment of the present disclosure. FIG. 8 is a cross-sectional view of an impeller cover of a motor according to an embodiment of the present disclosure. FIG. 9 is a perspective view of a lower impeller cover of a motor according to an embodiment of the present disclosure. FIG. 10 is a perspective view of an upper impeller cover of a motor according to an embodiment of the present disclosure. FIG. 11 and FIG. 12 are perspective views of an upper housing of a motor according to an embodiment of the present disclosure. FIG. 13 is a front view of an upper housing of a motor according to an embodiment of the present disclosure. FIG. 14 is a perspective view of an insulator of a motor according to an embodiment of the present disclosure. Fig. 15 is a perspective view of a stator core of a motor according to one embodiment of the present specification. Fig. 16 is a perspective view of a lower housing of a motor according to one embodiment of the present specification.

[0056] Referring to FIGS. 1 to 16, a motor (10) according to one embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator core (300), an insulator (400), a housing (500), an impeller (600), an impeller cover (700), a coupling member (800), a diffuser (900), and a bearing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0057] 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 motor (10) may be arranged to form a reverse flow path based on the rotation axis (100). Specifically, the impeller (600) may be arranged downstream of the flow path generated by the rotation of the impeller (600) coupled to the rotation axis (100). In other words, the flow path generated by the rotation of the impeller (600) may be formed by sequentially passing through the housing (500), the insulator (400), the impeller (600), and the diffuser (900). Through this, the heat dissipation effect for heat generated due to electromagnetic interaction between the rotor (200) and the stator core (300) may be improved compared to a motor arranged in a forward flow path.

[0058] The rotation axis (100) may extend axially. In the present invention, the axial direction may be interpreted as meaning a vertical direction or an up-down direction based on FIG. 4. In addition, the axial upper direction of the present invention may be interpreted as meaning the 'A' direction, and the axial lower direction may be interpreted as meaning the 'B' direction.

[0059] The rotation shaft (100) may be formed in a cylindrical shape. A rotor (200) may be coupled to the outer surface of the rotation shaft (100). The rotation shaft (100) may rotate in one direction or the other direction by the rotation of the rotor (200). An impeller (600) may be coupled to the outer surface of the rotation shaft (100). The impeller (600) may rotate in one direction or the other direction by the rotation of the rotation shaft (100). The rotation shaft (100) may be rotatably coupled to the housing (500) through a bearing (1000).

[0060] The rotor (200) can be coupled to the rotation shaft (100). The rotor (200) can rotate the rotation shaft (100) in one direction or the other direction by rotation. The rotor (200) can face the stator core (300). The rotor (200) can be placed inside the stator core (300). The rotor (200) can be formed in a cylindrical shape. The rotor (200) can be rotated in one direction or the other direction by electromagnetic interaction with the stator core (300). Specifically, when a magnetic field is formed in the stator core (300) by a coil (not shown) placed in the stator core (300), the rotor (200) can be rotated in one direction or the other direction by the resulting electromagnetic interaction. The rotor (200) can be placed between the first bearing (1010) and the second bearing (1020).

[0061] The stator core (300) may be coupled to a housing (500) or an insulator (400). The stator core (300) may face the rotor (200). A coil (not shown) may be arranged on the stator core (300). The stator core (300) may surround the rotor (200). The stator core (300) may be arranged on the radially outer side of the rotor (200). The stator core (300) may be formed of a conductive material. The stator may include the stator core (300) and the insulator (400) and may be referred to as a 'stator'.

[0062] Referring to FIG. 15, the stator core (300) may include an upper surface (310), a lower surface (320), an outer surface (330) connecting the upper surface (310) and the lower surface (320), and a vertical groove (332) formed radially inwardly concave on the outer surface (330). The vertical groove (332) may extend vertically. The vertical groove (332) may extend from the upper surface (310) to the lower surface (320) of the outer surface (330) of the stator core (300). The axial cross-section of the vertical groove (332) may be formed in an arc shape. The vertical groove (332) may be arranged radially adjacent to the connecting member (800). At least a portion of the vertical groove (332) may be fitted with a protrusion (5148) of the second engaging groove (5146) of the first leg portion (514) of the upper housing (510). This can improve space efficiency.

[0063] An insulator (400) can be coupled to the stator core (300). The insulator (400) can be formed of an insulating material.

[0064] Referring to FIG. 14, the insulator (400) may include a first region (410) positioned axially upper than the stator core (300), a second region (420) positioned axially lower than the stator core (300), and a third region (430) connecting the first region (410) and the second region (420).

[0065] The first region (410) may be disposed at the lower portion of the first body portion (512) of the upper housing (510). The first region (410) may be coupled with the first leg portion (514) of the upper housing (510). The first region (410) may include a first coupling groove (412) that is formed to be concave in a radially inward direction from a radially outer surface. The radially inner side of the first leg portion (514) of the upper housing (510) may be coupled to the first coupling groove (412). The first coupling groove (412) may include a plurality of first coupling grooves (412) spaced apart in the circumferential direction. In one embodiment of the present specification, the number of the plurality of first coupling grooves (412) is described as three as an example, but may be variously changed depending on the number of the first leg portions (514) of the upper housing (510).

[0066] The second region (420) may be disposed on the upper portion of the second body portion (522) of the lower housing (520). The second region (420) may be coupled with the second leg portion (524) of the lower housing (520). The second region (420) may include a second coupling groove (422) that is formed to be concave in a radially inward direction from a radially outer surface. The radially inner side of the second leg portion (524) of the lower housing (520) may be coupled to the second coupling groove (422). The second coupling groove (422) may include a plurality of second coupling grooves (422) spaced apart in the circumferential direction. In one embodiment of the present specification, the number of the plurality of second coupling grooves (422) is described as three as an example, but may be variously changed depending on the number of the second leg portions (524) of the lower housing (520).

[0067] A substrate (not shown) may be coupled to the axial rear end of the second region (420). The substrate may be electrically connected to a coil disposed on the stator core (300) to supply current to the coil.

[0068] The housing (500) can be coupled to the insulator (400). The housing (500) can surround the stator core (300). The housing (500) can include an upper housing (510) and a lower housing (520) axially spaced from the upper housing (510).

[0069] The upper housing (510) may be positioned axially upper than the lower housing (520). Referring to FIGS. 11 to 13, the upper housing (510) may include a first body portion (512) positioned axially upper than the stator core (300), and a first leg portion (514) extending axially from a radially outer side of the first body portion (512).

[0070] A first bearing (1010) may be coupled to the first body part (512). A rotation shaft (100) may be rotatably coupled to the first body part (512) via the first bearing (1010). A first central hole (5122) to which the first bearing (1010) is coupled may be formed in the first body part (512). The first body part (512) may be positioned axially above the first region (410) of the insulator (400). The first body part (512) may be formed in an annular shape.

[0071] The first leg portion (514) may be penetrated by the connecting member (800). The first leg portion (514) may be formed with a first leg hole (5144) penetrated by the connecting member (800). The first leg hole (5144) may extend in the axial direction to communicate the upper and lower surfaces of the first leg portion (514). The upper surface of the first leg portion (514) may be seated on the upper impeller cover (710). The upper surface of the first leg portion (514) may be seated on the lower surface of a seating portion (7122) formed in the lower region (712) of the upper impeller cover (710). The upper surface of the first leg portion (514) may be seated on a seating groove (7126) formed in the seating portion (7122).

[0072] The first leg portion (514) may include a support portion (5141) and a first guide portion (5142) formed to have a smaller diameter than the support portion (5141). The first guide portion (5142) may be formed in an upper region of the first leg portion (514). An area of ​​the first leg portion (514) excluding the first guide portion (5142) may be a support portion (5141). The first guide portion (5142) may penetrate the first hole (7244) of the lower impeller cover (720). The support portion (5141) may penetrate the second hole (7242) of the lower impeller cover (720). Among the first guide portions (5142), the axial height of the region (radially inner side) adjacent to the rotation axis (100) may be smaller than the axial height of the region (radially outer side) far from the rotation axis (100). Through this, the first leg portion (514) can guide the region passing through the lower impeller cover (720).

[0073] A leg step (5143) may be formed between the support (5141) and the first guide (5142). The leg step (5143) may be in contact with the hole step (7243) between the first hole (7244) and the second hole (7242) of the lower impeller cover (720). Through this, the position of the first leg (514) placed on the lower impeller cover (720) can be stably guided.

[0074] A lower region of the first leg portion (514) may be coupled to the insulator (400). Specifically, the lower region of the first leg portion (514) may be coupled to the first region (410) of the insulator (400). In this case, a radially inner region of the lower region of the first leg portion (514) may be coupled to a first coupling groove (412) of the first region (410). The first leg portion (514) may include a second coupling groove (5146) that is formed to be concave from the radially inner side to the radially outer side of the lower surface. A first surface facing the radially inner side of the second coupling groove (5146) may contact an outer surface (330) of the stator core (300), and a second surface facing the axially lower side of the second coupling groove (5146) may contact an upper surface (310) of the stator core (300). The first surface facing the radially inward direction or the rotation axis (100) of the second coupling groove (5146) may include a protrusion (5148) protruding radially inwardly. The protrusion (5148) may be arranged in the vertical groove (332) of the stator core (300).

[0075] The first leg portion (514) may include a plurality of first leg portions (514) spaced apart in the circumferential direction. In this specification, the number of the plurality of first leg portions (514) is described as three as an example, but is not limited thereto, and the number of the plurality of first leg portions (514) may vary.

[0076] The lower housing (520) may be positioned axially lower than the upper housing (510). Referring to FIG. 16, the lower housing (520) may include a second body portion (522) positioned axially lower than the stator core (300), and a second leg portion (524) extending axially upward from the radially outer side of the second body portion (522).

[0077] A second bearing (1020) may be coupled to the second body part (522). A rotation shaft (100) may be rotatably coupled to the second body part (522) via the second bearing (1020). A second central hole (5222) to which the second bearing (1020) is coupled may be formed in the second body part (522). The second body part (522) may be arranged axially lower in the second region (420) of the insulator (400). The second body part (522) may be formed in an annular shape.

[0078] The second leg portion (524) can be penetrated by the joining member (800). The second leg portion (524) can have a second leg hole (5242) formed therein through the joining member (800). The second leg hole (5242) can extend in the axial direction to connect the upper surface and the lower surface of the second leg portion (524). The upper surface of the second leg portion (524) can contact the lower surface (320) of the stator core (300). The radially inner region of the second leg portion (524) can be coupled to the second coupling groove (422) of the second region (420) of the insulator (400).

[0079] The second leg portion (524) may include a plurality of second leg portions (524) spaced apart in the circumferential direction. In this specification, the number of the plurality of second leg portions (524) is described as three as an example, but is not limited thereto, and the number of the plurality of second leg portions (524) may vary.

[0080] The impeller (600) may be coupled to the rotation shaft (100). The impeller (600) may be disposed in an axially upper region of the rotation shaft (100). The impeller (600) may be disposed axially upper of the first bearing (1010). The impeller (600) may rotate in one direction or the other depending on the rotation of the rotation shaft (100). The impeller (600) may be surrounded by an impeller cover (700). Specifically, the impeller (600) may be disposed radially inward of the upper impeller cover (710) and surrounded by the upper impeller cover (710). The impeller (600) may have a diameter that decreases as it goes downward in the axial direction. The impeller (600) 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 (600) to protrude radially outward and be spaced apart in the circumferential direction.

[0081] The impeller cover (700) can be combined with the housing (500). The impeller cover (700) can surround the impeller (600). The impeller cover (700) can be formed in a spherical shape overall. This can improve the air flow efficiency by the impeller (600) and enhance space efficiency.

[0082] The impeller cover (700) may include an upper impeller cover (710) and a lower impeller cover (720) positioned axially lower than the upper impeller cover (720). In one embodiment of the present specification, the upper impeller cover (710) and the lower impeller cover (720) are described as being formed separately and then joined, but it is not excluded that the upper impeller cover (710) and the lower impeller cover (720) are formed integrally.

[0083] The upper impeller cover (710) may be positioned axially upper than the lower impeller cover (720). The upper impeller cover (710) may be formed such that the inner diameter of the lower region (712) is smaller than the inner diameter of the upper region (714). The outer diameter of the upper region (714) of the upper impeller cover (710) may be constant. The diameter of the lower region (712) of the upper impeller cover (710) may decrease as it goes axially downward. The inner diameter of the upper region (714) of the upper impeller cover (710) may be formed larger than the diameter of the lower region (722) of the lower impeller cover (720).

[0084] The upper impeller cover (710) may include a seating portion (7122) extending axially downward from a radially outer surface of an adjacent area of ​​the lower surface (716). The seating portion (7122) may be formed in the lower area (712) of the upper impeller cover (710). A coupling member (800) may be coupled to the seating portion (7122). The seating portion (7122) may include a seating groove (7126) that is concavely formed from the lower surface to the upper surface. An upper surface of the first leg portion (514) of the upper housing (510) may be seated in the seating groove (7126).

[0085] The lower impeller cover (720) may be positioned axially lower than the upper impeller cover (710). The inner diameter of the upper region (724) of the lower impeller cover (720) may be formed smaller than the inner diameter of the lower region (722). The inner diameter or outer diameter of the lower region (722) of the lower impeller cover (720) may be constant. The diameter of the upper region (724) of the lower impeller cover (720) may decrease as it goes axially upward.

[0086] An area adjacent to the upper surface (726) of the upper region (724) of the lower impeller cover (720) may include a first hole (7244) penetrated by a first guide portion (5142) and a second hole (7242) penetrated by a support portion (5141). The diameter of the second hole (7242) may be formed to be larger than the diameter of the first hole (7244). A hole step (7243) may be formed between the first hole (7244) and the second hole (7242). The hole step (7243) may be in contact with the leg step (5143) of the first leg portion (514). Through this, the area where the first leg portion (514) passes through the lower impeller cover (720) may be guided.

[0087] The lower surface (716) of the upper impeller cover (710) and the upper surface (726) of the lower impeller cover (720) can be joined by contacting each other. The inner diameter of the lower surface (716) of the upper impeller cover (710) and the inner diameter of the upper surface (726) of the lower impeller cover (720) can be substantially the same. The first step portion (7162) formed on the lower surface of the upper impeller cover (710) and the second step portion (7262) formed on the upper surface (726) of the lower impeller cover (720) can be in contact with each other. The first step portion (7162) and the second step portion (7262) can be formed in complementary shapes. Through this, not only can the position where the upper impeller cover (710) and the lower impeller cover (720) are joined be guided, but also the contact surface between the lower surface (716) of the upper impeller cover (710) and the upper surface (726) of the lower impeller cover (720) can be increased to improve the joining strength.

[0088] The coupling member (800) can couple the housing (500) and the impeller cover (700). The coupling member (800) can be coupled to the upper impeller cover (710) by sequentially penetrating the lower housing (520), the upper housing (510), and the lower impeller cover (720). In this case, the coupling member (800) can be coupled to the lower region (712) of the upper impeller cover (710) and the upper region (724) of the lower impeller cover (720). Specifically, the coupling member (800) can penetrate an area adjacent to the upper surface (726) of the lower impeller cover (720) and be coupled to an area adjacent to the lower surface (716) of the upper impeller cover (710). Through this, the lower housing (520), the upper housing (510), the lower impeller cover (720), and the upper impeller cover (710) can be combined at once, and deformation of the impeller cover (700) that occurs when the motor (10) operates can be reduced, and the euro performance can be improved. In addition, the space efficiency of the internal components of the motor (10) can be improved.

[0089] The coupling member (800) can be coupled to the mounting portion (7122) of the lower region (712) of the upper impeller cover (710). Specifically, the coupling member (800) can be coupled to a third mounting groove (7124) formed on the inner side of the mounting portion (7122). The third mounting groove (7124) of the mounting portion (7122) can be formed concavely axially upward on the lower surface of the mounting groove (7126) of the mounting portion (7122).

[0090] The joining member (800) may be positioned adjacent to the outer surface (330) of the stator core (300). Specifically, the joining member (800) may be positioned radially adjacent to a vertical groove (332) formed on the outer surface (330) of the stator core (300). This may improve space efficiency.

[0091] The connecting member (800) may include a plurality of connecting members (800) spaced apart in the circumferential direction. In one embodiment of the present specification, the number of connecting members (800) is described as three as an example, but is not limited thereto and may vary depending on the number of first leg portions (514) of the upper housing (510) and the number of second leg portions (524) of the lower housing (520).

[0092] The diffuser (900) may be coupled to the impeller cover (700). The diffuser (900) may be coupled to the upper impeller cover (710). The diffuser (900) may be coupled to the upper region (714) of the upper impeller cover (710). The diffuser (900) may protrude axially upward from the upper impeller cover (710). The diffuser (900) may be arranged axially upward of the rotational axis (100) and the impeller (600). The diffuser (900) may include guide vanes formed radially outward. Through this, the efficiency of air flow by the impeller (600) may be improved.

[0093] A bearing (1000) can rotatably couple a rotation shaft (100) to a housing (500). The bearing (1000) can include a first bearing (1010) positioned axially upper of the rotor (200) and a second bearing (1020) positioned axially lower of the rotor (200).

[0094] The first bearing (1010) can be coupled to the upper housing (510). The first bearing (1010) can be coupled to the first central hole (5122) of the first body portion (512) of the upper housing (510). The first bearing (1010) can be arranged on the outer circumferential surface of the rotation shaft (100). Through this, the first bearing (1010) can rotatably couple the rotation shaft (100) to the upper housing (510).

[0095] The second bearing (1020) can be coupled to the lower housing (520). The second bearing (1020) can be coupled to the second central hole (5222) of the second body portion (522) of the lower housing (520). The second bearing (1020) can be arranged on the outer peripheral surface of the rotational axis (100). Through this, the second bearing (1020) can rotatably couple the rotational axis (100) to the lower housing (520).

[0096] Fig. 17 is a drawing showing deformation of an impeller cover according to the operation of a motor according to one embodiment of the present specification. Fig. 18 is a drawing showing deformation of an impeller cover according to the operation of a motor according to the prior art.

[0097] Referring to FIG. 17, it can be seen that the deformation of the impeller cover (700) according to the operation of the motor (10) according to one embodiment of the present specification is not large.

[0098] In contrast, referring to FIG. 18, it can be seen that the deformation of the impeller cover according to the operation of the motor according to the prior art is large.

[0099] That is, in the case of the motor (10) according to one embodiment of the present specification, deformation of the impeller cover (700) is reduced, so damage to the parts can be prevented and vibration can be reduced.

[0100] 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. Rotation axis; A rotor coupled to the above rotation axis; A stator core disposed radially outside the rotor; An insulator coupled to the stator core; A housing coupled to the above insulator and surrounding the stator core; An impeller coupled to the axial upper region of the above rotating shaft; An impeller cover coupled to the housing and surrounding the impeller; and Including a joining member that joins the housing and the impeller cover, The housing includes an upper housing and a lower housing spaced apart from the upper housing in the axial direction, The above impeller cover includes an upper impeller cover and a lower impeller cover arranged axially lower than the upper impeller cover, A motor in which the above-mentioned connecting member sequentially penetrates the lower housing, the upper housing, and the lower impeller cover and is connected to the upper impeller cover.

2. In paragraph 1, The upper impeller cover is formed so that the inner diameter of the lower region is smaller than the inner diameter of the upper region, The upper impeller cover is formed so that the inner diameter of the upper region is smaller than the inner diameter of the lower region, The above-mentioned coupling member is a motor coupled to the lower region of the upper impeller cover and the upper region of the lower impeller cover.

3. In paragraph 2, The upper impeller cover has a diameter that decreases as it goes downward in the axial direction, The diameter of the above lower impeller cover decreases as it goes upward in the axial direction, A motor in which the above-mentioned joining member penetrates an area adjacent to the upper surface of the lower impeller cover and is joined to an area adjacent to the lower surface of the upper impeller cover.

4. In paragraph 3, The upper impeller cover includes a mounting portion extending axially downward from the radially outer surface of the area adjacent to the lower surface, The above-mentioned connecting member is a motor connected to the above-mentioned mounting portion.

5. In paragraph 4, The upper housing includes a first annular body portion arranged axially upper portion of the stator core, and a first leg portion extending axially from a radially outer side of the first body portion, A motor in which the first leg portion is penetrated by the connecting member, and the upper surface of the first leg portion is seated on the lower surface of the mounting portion.

6. In paragraph 5, A motor in which the above-mentioned mounting portion is formed concavely from the bottom to the top, and includes a mounting groove in which the upper surface of the first leg portion is mounted.

7. In paragraph 5, The upper region of the first leg portion includes a first guide portion formed to have a smaller diameter than other regions, A motor in which the adjacent area of ​​the upper surface of the lower impeller cover includes a first hole penetrated by the first guide portion and a second hole penetrated by the other area of ​​the first leg portion.

8. In paragraph 7, A motor in which the axial height of the region adjacent to the rotation axis among the first guide parts is smaller than the axial height of the region far from the rotation axis.

9. In paragraph 2, The lower surface of the upper impeller cover includes a first step, A motor in which the upper surface of the lower impeller cover, which is in contact with the lower surface of the upper impeller cover, includes a second step portion formed in a shape complementary to the first step portion.

10. In paragraph 2, A motor in which the inner diameter of the upper region of the upper impeller cover is larger than the inner diameter of the lower region of the lower impeller cover.

11. In paragraph 1, The above stator core is formed concavely in the radially inward direction on the radially outer surface and includes a vertical groove extending in the axial direction, A motor in which the above-mentioned connecting member is positioned radially adjacent to the above-mentioned vertical groove.

12. In paragraph 1, The insulator includes a first region arranged axially upper portion of the stator core, a second region arranged axially lower portion of the stator core, and a third region connecting the first region and the second region. The upper housing includes a first annular body portion arranged axially upper in the first region, and a first leg portion extending vertically from a radially outer side of the first body portion, The lower region of the above first leg section is a motor coupled to the above first region.

13. In paragraph 12, A motor in which the first region is formed concavely inwardly in the radial direction from the radial outer surface and includes a first coupling groove to which the radial inner region of the first leg portion is coupled.

14. In paragraph 12, The first leg portion includes a second joining groove formed concavely from the radially inner side to the radially outer side of the lower surface, A motor in which a first surface facing the radially inner side of the second coupling groove contacts an outer surface of the stator core, and a second surface facing the axially lower side of the second coupling groove contacts an upper surface of the stator core.

15. In paragraph 14, The above stator core is formed concavely in the radially inward direction on the radially outer surface and includes a vertical groove extending in the axial direction, A motor in which the first surface of the second coupling groove includes a protrusion that protrudes radially inwardly and is arranged in the vertical groove.

16. In paragraph 12, The lower housing includes a second annular body portion arranged axially lower in the second region, and a second leg portion extending axially upper from the radially outer side of the second body portion, The second region is formed concavely inwardly in the radial direction from the radial outer surface and includes a second joining groove to which the radial inner region of the second leg portion is joined. A motor in which the upper surface of the second leg portion is in contact with the axial lower surface of the stator core.

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

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