Motor

Abstract

A motor is provided. The motor according to one aspect of the present specification comprises: a first housing; a rotary shaft rotatably coupled to the first housing; a rotor coupled to the rotary shaft; a stator assembly coupled to the first housing, and disposed radially outward of the rotor; an impeller coupled to the lower region of the rotary shaft in the axial direction; and a second housing which is coupled to the first housing and which encompasses the impeller, wherein the first housing includes: a bearing housing to which the rotary shaft is rotatably coupled; and a plurality of first leg parts which extend axially downward from a radial outer side of the bearing housing and which are spaced apart in the circumferential direction, the second housing includes: an impeller cover encompassing the impeller; and a plurality of second leg parts which extend axially upward from the outer surface of the impeller cover and which are coupled to the plurality of first leg parts, and the upper end of the impeller cover can be disposed at the lower portion of the stator assembly in the axial direction and the plurality of second leg parts can be disposed radially outward of the stator assembly.

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, there was a problem that efficiency was reduced because the euro resistance increased due to the arrangement of a part of the first housing or the second housing between the impeller and the stator to combine the stator and the second housing.

[0007] The problem that this specification seeks to solve is to provide a motor that can improve euro performance during motor operation.

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

[0009] In addition, the problem that this specification seeks to solve is to provide a motor that can reduce material costs.

[0010] In addition, the problem that this specification seeks to solve is to provide a motor whose interior can be visually inspected.

[0011] According to one aspect of the present specification for achieving the above task, a motor includes a first housing, a rotational shaft rotatably coupled to the first housing, a rotor coupled to the rotational shaft, a stator assembly coupled to the first housing and disposed radially outside the rotor, an impeller coupled to an axial lower region of the rotational shaft, and a second housing coupled to the first housing and surrounding the impeller.

[0012] In this case, the first housing may include a bearing housing to which the rotation shaft is rotatably coupled, and a plurality of first leg portions extending axially downward from a radially outer side of the bearing housing and spaced apart in a circumferential direction, and the second housing may include an impeller cover surrounding the impeller, and a plurality of second leg portions extending axially upward from an outer surface of the impeller cover and coupled to the plurality of first leg portions.

[0013] Additionally, the upper end of the impeller cover may be positioned axially lower than the stator assembly, and the plurality of second leg portions may be positioned radially outer than the stator assembly.

[0014] This can improve the euro performance during motor operation.

[0015] Additionally, the upper surface of the impeller cover can directly face the lower surface of the stator assembly.

[0016] This allows the axial length of the motor to be reduced, improving space efficiency.

[0017] Additionally, the impeller cover may be non-overlapping with the stator assembly in a direction perpendicular to the axial direction.

[0018] In addition, the plurality of second leg portions are spaced apart from each other in the circumferential direction, and each of the plurality of second leg portions can directly face each other in the circumferential direction.

[0019] Through this, the material cost of the motor can be reduced.

[0020] Additionally, the axial upper region of the impeller cover may be formed to have a smaller inner diameter than the axial lower region of the impeller cover.

[0021] In addition, the impeller cover includes an overlapping region that overlaps the impeller in a direction perpendicular to the axial direction, and an upper region that extends axially upward from the overlapping region, and the inner diameter of the upper region may increase as it goes upward in the axial direction.

[0022] In addition, the upper surface of the upper region is formed as a curved surface, and the region from the axial upper end of the upper region to the radial inner end can have a constant radius of curvature.

[0023] In addition, the upper surface of the upper region is formed as a curved surface, and the radius of curvature of the region from the axial upper end to the radial inner end of the upper region may become larger as it goes upward in the axial direction.

[0024] In addition, the upper surface of the upper region is formed as a curved surface, and the radius of curvature of the region from the axial upper end to the radial inner end of the upper region may become smaller as it goes upward in the axial direction.

[0025] Additionally, the upper region may include a tapered surface that is positioned axially downward as it becomes radially inward from the upper surface.

[0026] In this case, the upper region includes a curved surface formed from the tapered surface to the radially inner end, and the curved surface may have a constant radius of curvature.

[0027] Additionally, the outer diameter of the upper region may be constant.

[0028] Additionally, the inner diameter of the above-mentioned overlapping region may decrease as it goes upward in the axial direction.

[0029] In addition, the plurality of second leg portions may include a first coupling portion protruding in a radially inner region, and the stator assembly may include a stator core disposed on a radially outer side of the rotor, a coil wound around the stator core, and an insulator coupled to the stator core.

[0030] In this case, the radially outer surface of the axial lower region of the insulator may be formed to be concave in the radially inner direction and may include a second joint portion coupled to the first joint portion.

[0031] In addition, the first housing may further include a circular cylindrical portion extending in a circumferential direction and connecting the plurality of first leg portions, the plurality of first leg portions may be formed to be concave in a radially outer direction from a radially inner surface, and may include a third connecting portion to which the plurality of second leg portions are connected.

[0032] In this case, the radially outer surface of the plurality of second leg portions can be in contact with the radially inner surface of the cylindrical portion.

[0033] Additionally, the cylindrical portion may include a plurality of cylindrical portions spaced apart in the axial direction.

[0034] Additionally, the first housing may include a plurality of connecting portions connecting the bearing housing and the plurality of first leg portions, and a fourth connecting portion extending axially downward from the plurality of connecting portions and extending radially inward from the plurality of first leg portions.

[0035] Additionally, the stator assembly may include a stator core disposed radially outside the rotor, a coil wound around the stator core, and an insulator coupled to the stator core.

[0036] In this case, the radially outer surface of the axial upper region of the insulator may be formed to be concave in the radially inner direction and may include a fifth joint on which the fourth joint is seated.

[0037] Additionally, the impeller may be positioned downstream of the flow path generated by the rotation of the impeller.

[0038] Additionally, the first housing may further include a cylindrical portion connecting the plurality of first leg portions and extending in a circumferential direction, and the cylindrical portion may include a plurality of holes penetrating the cylindrical portion in a radial direction.

[0039] Additionally, it may include a diffuser coupled to the second housing and having the rotation axis rotatably coupled thereto.

[0040] In this case, the impeller cover may include an overlapping region that overlaps the impeller in a direction perpendicular to the axial direction, and a lower region that extends axially downward from the overlapping region, the lower region being formed concavely from a radially inner side to a radially outer side, and may include a sixth joining portion to which the radially outer side of the diffuser is joined.

[0041] The present specification provides a motor capable of improving euro performance during motor operation.

[0042] Additionally, the present specification can provide a motor that can improve space efficiency.

[0043] Additionally, a motor capable of reducing material costs can be provided through this specification.

[0044] Additionally, the present specification can provide a motor whose interior can be visually inspected.

[0045] Figure 1 is a perspective view of a motor according to the first embodiment of the present specification.

[0046] Figure 2 is an exploded perspective view of a motor according to the first embodiment of the present specification.

[0047] Figure 3 is a cross-sectional view of a motor according to the first embodiment of the present specification.

[0048] Figures 4 and 5 are perspective views of a second housing of a motor according to the first embodiment of the present specification.

[0049] Figures 6 and 7 are perspective views of a first housing of a motor according to the first embodiment of the present specification.

[0050] FIG. 8 is a cross-sectional view of a portion of a second housing of a motor according to the first embodiment of the present specification.

[0051] FIG. 9 is a perspective view of a stator assembly of a motor according to the first embodiment of the present specification.

[0052] Fig. 10 is a cross-sectional view of a motor according to the second embodiment of the present specification.

[0053] Fig. 11 is a cross-sectional view of an impeller cover of a motor according to the second embodiment of the present specification.

[0054] Fig. 12 is a cross-sectional view of a motor according to the third embodiment of the present specification.

[0055] Fig. 13 is a cross-sectional view of an impeller cover of a motor according to a third embodiment of the present specification.

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

[0057] Fig. 15 is a cross-sectional view of an impeller cover of a motor according to the fourth embodiment of the present specification.

[0058] FIG. 16 is a drawing showing the flow of air passing through a motor according to embodiments of the present specification.

[0059] Fig. 17 is a perspective view of a part of a motor according to the fifth embodiment of the present specification.

[0060] Fig. 18 is a perspective view of a part of a motor according to the sixth embodiment of the present specification.

[0061] Fig. 19 is a perspective view of a part of a motor according to the seventh embodiment of the present specification.

[0062] Fig. 20 is a perspective view of a part of a motor according to the eighth embodiment of the present specification.

[0063] 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.

[0064] 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. FIGS. 4 and 5 are perspective views of a second housing of a motor according to a first embodiment of the present specification. FIGS. 6 and 7 are perspective views of a first housing of a motor according to a first embodiment of the present specification. FIG. 8 is a cross-sectional view of an impeller cover of a motor according to a first embodiment of the present specification. FIG. 9 is a perspective view of a stator assembly of a motor according to a first embodiment of the present specification.

[0065] Referring to FIGS. 1 to 9, a motor (10) according to one embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0066] 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 (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 shaft (100). In other words, air outside the motor (10) is sucked into the inside of the motor (10) according to the rotation of the impeller (600), and the flow path through which the air flows inside the motor (10) may be formed by sequentially passing through the first housing (400), the stator assembly (300), the impeller (600), and the diffusers (700, 800). Through this, the heat dissipation effect for heat generated due to electromagnetic interaction between the rotor (200) and the stator assembly (300) can be improved compared to a motor arranged in a forward flow path.

[0067] 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 with reference to FIGS. 1 to 3. In addition, the axial upper direction of the present invention is interpreted as meaning the 'A' direction, and the axial lower direction is interpreted as meaning the 'B' direction.

[0068] 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 first housing (400) through a first bearing (500). The rotation shaft (100) may be rotatably coupled to the diffuser (700, 800) through a second bearing (900).

[0069] The rotor (200) may face the stator assembly (300). The rotor (200) may be disposed within a space formed by the stator assembly (300). The rotor (200) may be formed in a cylindrical shape. The rotor (200) may be rotated in one direction or the other direction by electromagnetic interaction with the stator core (310) of the stator assembly (300). Specifically, when a magnetic field is formed in the stator core (310) by a coil (320) wound around the stator core (310), the rotor (200) may be rotated in one direction or the other direction by the resulting electromagnetic interaction. The rotor (200) may be disposed between the first bearing (500) and the second bearing (900).

[0070] The stator assembly (300) may be coupled to the first housing (400) and / or the second housing (1000). The stator assembly (300) may be referred to as a 'stator'. The stator assembly (300) may include a stator core (310), a coil (320), and an insulator (330).

[0071] The stator core (310) is arranged radially outside the rotor (200) and may face the rotor (200). A coil (320) may be wound around the stator core (310). The stator core (310) may be formed of a conductive material.

[0072] An insulator (330) may surround the stator core (310). The insulator (330) may be formed of an insulating material.

[0073] The first housing (400) may include a first leg portion (430). The first leg portion (430) may extend axially downward from a radially outer side of the bearing housing (410). The first leg portion (430) may extend axially downward from a radially outer end of the connection portion (420). The first leg portion (430) may extend vertically. The first leg portion (430) may be coupled to the second housing (1000). The first leg portion (430) may include a plurality of first leg portions (430) spaced apart from each other in the circumferential direction. In the present specification, the number of the plurality of first leg portions (430) is described as three as an example, but is not limited thereto, and the number of the plurality of first leg portions (430) may vary.

[0074] The insulator (330) may include an upper region (332). The upper region (332) of the insulator (330) may be positioned axially above the stator core (310). The upper region (332) of the insulator (330) may be coupled to the first housing (400). The upper region (332) of the insulator (330) may be coupled to the first leg portion (430) of the first housing (400). The radially outer surface of the upper region (332) of the insulator (330) may include a fifth coupling portion (3322) that is formed to be concave in a radially inward direction. The fourth coupling portion (440) of the first housing (400) may be coupled to the fifth coupling portion (3322). The fourth coupling portion (440) of the first housing (400) can be mounted in the fifth coupling portion (3322). For example, the fourth coupling portion (440) of the first housing (400) can be inserted into the fifth coupling portion (3322).

[0075] The insulator (330) may include a lower region (334). The lower region (334) of the insulator (330) may be positioned axially lower than the stator core (310). The lower region (334) of the insulator (330) may be coupled to the second housing (1000). The lower region (334) of the insulator (330) may be coupled to the second leg portion (1200) of the second housing (1000). The radially outer surface of the lower region (334) of the insulator (330) may include a second coupling portion (3342) that is formed to be concave in the radially inner direction. The first coupling portion (1220) of the second leg portion (1200) of the second housing (1000) may be coupled to the second coupling portion (3342). For example, the first coupling portion (1220) can be inserted into the second coupling portion (3342).

[0076] The first housing (400) can be coupled to the stator assembly (300). The first housing (400) can be coupled to the insulator (330). The first housing (400) can surround the stator core (310). A rotation shaft (100) can be rotatably coupled to the first housing (400). A first bearing (500) can be coupled to the first housing (400).

[0077] The first housing (400) may include a bearing housing (410). The bearing housing (410) may be disposed axially upper portion of the stator assembly (300). The bearing housing (410) may be formed in a cylindrical shape or annular shape. The bearing housing (410) may be penetrated by a rotational shaft (100). The bearing housing (410) may include a rotational shaft hole (412) penetrated by the rotational shaft (100). A first bearing (500) may be coupled to the bearing housing (410). The bearing housing (410) may include a bearing groove (414) that is concavely formed axially upward from a lower surface or concavely formed radially outward from a radially inner surface. The first bearing (500) may be coupled to the bearing groove (414). Through the first bearing (500), a rotation shaft (100) can be rotatably coupled to the bearing housing (410).

[0078] The first housing (400) may include a connecting portion (420). The connecting portion (420) may extend radially outward from a radially outer surface or an outer circumferential surface of the bearing housing (410). The connecting portion (420) may connect the bearing housing (410) and the first leg portion (430). The connecting portion (420) may include a plurality of connecting portions (420) that connect the bearing housing (410) and a plurality of first leg portions (430).

[0079] The first leg portion (430) can be coupled with the second leg portion (1200) of the second housing (1000). The first leg portion (430) can be coupled with the second leg portion (1200) of the second housing (1000) through a fastening member (not shown). For this purpose, a first fastening hole (432) can be formed in the first leg portion (430).

[0080] The first leg portion (430) may include a third connecting portion (434) that is formed concavely from a radially inner surface to a radially outer region. The second leg portion (1200) may be connected to the third connecting portion (434). Specifically, the third connecting portion (434) may contact the radially outer surface of the second leg portion (1200) and may contact portions of both side surfaces that are connected to the radially outer surface of the second leg portion.

[0081] The first housing (400) may include a fourth coupling portion (440). The fourth coupling portion (440) may extend axially downward from the connection portion (420). The fourth coupling portion (440) may extend radially inward from the first leg portion (430). The fourth coupling portion (440) may extend axially downward from the connection portion (420) while simultaneously extending radially inward from the first leg portion (430). The fourth coupling portion (440) may be coupled to a fifth coupling portion (3322) of an upper region (332) of the insulator (330). A radially inner surface of the fourth coupling portion (440) may contact the fifth coupling portion (3322). Portions of both side surfaces connected to the radially inner surface of the fourth coupling portion (440) may contact the fifth coupling portion (3322).

[0082] The first housing (400) may include a cylindrical portion (450). The cylindrical portion (450) may extend in a circumferential direction. The cylindrical portion (450) may connect a plurality of first leg portions (430). The cylindrical portion (450) may be formed in an overall circular shape. This may enhance the rigidity of the first housing (400). The radially inner surface of the cylindrical portion (450) may contact the radially outer surface of the second leg portion (1200).

[0083] The first bearing (500) may be arranged axially upper portion of the stator assembly (300). The first bearing (500) may be formed in an annular shape.

[0084] The impeller (600) may be disposed in an axial lower region of the rotation shaft (100). The impeller (600) may be disposed between the stator assembly (300) and the second bearing (900). The impeller (600) may be surrounded by the second housing (1000). Specifically, the impeller (600) may be disposed radially inward of an overlapping region (1110) of the impeller cover (1100) and surrounded by the impeller cover (1100). The impeller (600) may have a diameter that decreases toward the axial upper portion. The impeller (600) may be formed in a conical shape with an open center. A plurality of impeller blades may be formed on a radially outer surface of the impeller (600) to protrude radially outward and be spaced apart from each other in a circumferential direction.

[0085] The diffuser (700, 800) may be positioned axially lower than the impeller (600). The diffuser (700, 800) may be coupled to the impeller cover (1100) of the second housing (1000). The diffuser (700, 800) may be coupled to the sixth coupling portion (1132) of the impeller cover (1100).

[0086] The diffuser (700, 800) may include a first diffuser (700) positioned axially lower than the impeller (600), and a second diffuser (800) positioned axially lower than the first diffuser (700).

[0087] A second bearing (900) may be coupled to the first diffuser (700). A rotation shaft (100) may be rotatably coupled to the first diffuser (700). The first diffuser (700) may be coupled to the sixth coupling portion (1132) of the impeller cover (1100). The first diffuser (700) may include a first diffuser body (710) to which the rotation shaft (100) may be rotatably coupled via the second bearing (900), a plurality of first guide vanes (720) arranged in a radially outer region of the first diffuser body (710) and spaced apart in a circumferential direction, and a first outer surface (730) connecting radially outer ends of the plurality of first guide vanes (720) and connected in a circumferential direction. The first outer surface (730) can be joined to the sixth joining portion (1132) of the impeller cover (1100).

[0088] A second diffuser (800) may be coupled to the first diffuser (700). The second diffuser (800) may include a second diffuser body (810), a plurality of second guide vanes (820) arranged in a radially outer region of the second diffuser body (810) and spaced apart in a circumferential direction, and a second outer surface (830) connecting radially outer ends of the plurality of second guide vanes (820) and connected in a circumferential direction.

[0089] The number and shape of the first guide vane (720) and the second guide vane (820) may be different from each other. Through this, the first guide vane (720) and the second guide vane (820) can improve the efficiency of air flow by the impeller (600).

[0090] The second bearing (900) can be coupled to the diffuser (700, 800). The second bearing (900) can be positioned below the impeller (600). The second bearing (900) can be coupled to the first diffuser (700). A rotational shaft (100) can be coupled to the second bearing (900). Through this, the second bearing (900) can rotatably couple the rotational shaft (100) to the diffuser (700, 800). The second bearing (900) can be formed in an annular shape.

[0091] The second housing (1000) can be combined with the first housing (400). The second housing (1000) can surround the impeller (600). A diffuser (700, 800) can be combined with the second housing (1000).

[0092] The second housing (1000) may include an impeller cover (1100). The impeller cover (1100) may surround the impeller (600). The impeller cover (1100) may face the impeller (600). An air gap may be formed between the radially inner surface of the impeller cover (1100) and the impeller (600). The impeller cover (1100) may be formed in a shape in which the inner diameter thereof decreases as it goes upward in the lateral direction. The impeller cover (1100) may be formed in a shape in which the outer diameter thereof decreases as it goes upward in the axial direction. Through this, the air flow efficiency by the impeller (600) may be improved, and space efficiency may be improved.

[0093] The upper end of the impeller cover (1100) may be positioned axially lower than the stator assembly (300). The upper end of the impeller cover (1100) may overlap with the stator assembly (300) in the axial direction. The upper surface of the impeller cover (1100) may directly face the lower surface of the stator assembly (300). That is, no component may be positioned between the upper surface of the impeller cover (1100) and the lower surface of the stator assembly (300). Accordingly, since there is no resistor positioned between the upper surface of the impeller cover (1100) and the stator assembly (300), the flow path performance of the motor (10) can be improved. In addition, the axial length of the motor (10) can be reduced to improve space efficiency. The impeller cover (1100) may not overlap with the stator assembly (300) in a direction perpendicular to the axial direction.

[0094] The impeller cover (1100) may include an overlapping region (1110), an upper region (1120), and a lower region (1130).

[0095] The overlapping area (1110) of the impeller cover (1100) may overlap with the impeller (600) in a direction perpendicular to the axial direction or in the radial direction. The inner diameter of the overlapping area (1110) of the impeller cover (1100) may decrease as it goes upward in the axial direction. At least a portion of the overlapping area (1110) of the impeller cover (1100) may have an outer diameter that decreases as it goes upward in the axial direction. The radially inner surface of the overlapping area (1110) of the impeller cover (1100) may face the impeller (600). An air gap may be formed between the radially inner surface of the overlapping area (1110) of the impeller cover (1100) and the impeller (600). The lower end of the second leg portion (1200) may be arranged on the radially outer surface of the overlapping area (1110) of the impeller cover (1100).

[0096] The upper region (1120) of the impeller cover (1100) may be positioned above the overlapping region (1110). The upper region (1120) of the impeller cover (1100) may extend vertically. The upper region (1120) of the impeller cover (1100) may extend axially upward from the overlapping region (1110). The upper region (1120) of the impeller cover (1100) may have a smaller inner diameter than the lower region (1130) of the impeller cover (1100). The inner diameter of the upper region (1120) of the impeller cover (1100) may increase as it goes axially upward. The outer diameter of the upper region (1120) of the impeller cover (1100) may be constant.

[0097] The upper surface (1122) of the impeller cover (1100) may be formed as a curved surface. Specifically, the upper surface (1122) of the upper region (1120) of the impeller cover (1100) may be formed as a curved surface. The region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) may have a constant radius of curvature (R1). Since the region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) has a constant radius of curvature (R1), turbulence of air flowing into the inside of the impeller cover (1100) can be prevented.

[0098] The lower region (1130) of the impeller cover (1100) may be positioned below the overlapping region (1110). The lower region (1130) of the impeller cover (1100) may extend vertically. The lower region (1130) of the impeller cover (1100) may extend axially downward from the overlapping region (1110). The lower region (1130) of the impeller cover (1100) may have a larger inner diameter than the upper region (1120) of the impeller cover (1100).

[0099] The lower region (1130) of the impeller cover (1100) may include a sixth connecting portion (1132) that is formed concavely from the radially inner side to the radially outer side. A diffuser (700, 800) may be connected to the sixth connecting portion (1132). Specifically, the first outer surface (730) of the first diffuser (700) may be connected to the sixth connecting portion (1132).

[0100] The second housing (1000) may include a second leg portion (1200). The second leg portion (1200) may extend axially upward from an outer surface of the impeller cover (1100). Specifically, the second leg portion (1200) may extend axially upward from a radially outer surface of an overlapping region (1110) of the impeller cover (1100). The second leg portion (1200) may extend vertically. The second leg portion (1200) may be arranged radially outer of the stator assembly (300). This may improve space efficiency.

[0101] The second leg portion (1200) can be coupled with the first housing (400). The second leg portion (1200) can be coupled with the first leg portion (430) of the first housing (400). The second leg portion (1200) can be coupled to the third connecting portion (434) of the first leg portion (430) of the first housing (400). The radially outer surface of the second leg portion (1200) can be in contact with the third connecting portion (434). Parts of both side surfaces connected to the radially outer surface of the second leg portion (1200) can be in contact with the third connecting portion (434). The radially outer surface of the second leg portion (1200) can be in contact with the radially inner surface of the cylindrical portion (450).

[0102] The second leg part (1200) may include a leg body (1210) extending vertically from the outer surface of the impeller cover (1100), a first connecting part (1220) protruding radially inward from the radially inner surface of the leg body (1210), and a second fastening hole (1230) formed on the upper surface of the body (1210).

[0103] The first connecting portion (1220) may protrude radially inward from the second leg portion (1200). The first connecting portion (1220) may be connected to the second connecting portion (3342) of the lower portion (334) of the insulator (330).

[0104] The second fastening hole (1230) may overlap the first fastening hole (432) of the first leg portion (430) in a vertical or axial direction. The fastening member may be fastened to the second fastening hole (1230) by penetrating the first fastening hole (432), thereby connecting the first leg portion (430) and the second leg portion (1200).

[0105] The second leg (1200) may include a plurality of second leg portions (1200) spaced apart in the circumferential direction. Each of the plurality of second leg portions (1200) may directly face each other. That is, no components may be arranged in the space between the plurality of second leg portions (1200). This can reduce the material cost of the motor (10). In addition, since the interior of the motor (10) can be visually inspected, it is easy to determine whether there is a malfunction.

[0106] In general, the motor (10) is placed in a space isolated from the outside. That is, even if a space is opened between the second leg parts (1200), since the motor (10) is placed in a space isolated from the outside, it does not significantly affect the flow of air passing through the motor (10) in the vertical direction.

[0107] In one embodiment of the present specification, the number of second leg parts (1200) is described as three as an example, but is not limited thereto and the number of second leg parts (1200) may be changed in various ways.

[0108] Fig. 10 is a cross-sectional view of a motor according to a second embodiment of the present specification. Fig. 11 is a cross-sectional view of an impeller cover of a motor according to a second embodiment of the present specification.

[0109] Referring to FIGS. 10 and 11, a motor (10) according to the second embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0110] The detailed configuration of the motor (10) according to the second embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the first embodiment of the present specification.

[0111] The upper surface (1122) of the impeller cover (1100) may be formed as a curved surface. Specifically, the upper surface (1122) of the upper region (1120) of the impeller cover (1100) may be formed as a curved surface. The region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) may have a radius of curvature (R2) that increases as it goes upward in the axial direction. The region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) may have a partial elliptical shape. Since the radius of curvature (R2) of the region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) gradually decreases as it goes downward in the axial direction, the efficiency of air flow introduced into the inside of the impeller cover (1100) may be improved.

[0112] Fig. 12 is a cross-sectional view of a motor according to a third embodiment of the present specification. Fig. 13 is a cross-sectional view of an impeller cover of a motor according to a third embodiment of the present specification.

[0113] Referring to FIGS. 12 and 13, a motor (10) according to a third embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0114] The detailed configuration of the motor (10) according to the third embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the first embodiment of the present specification.

[0115] The upper surface (1122) of the impeller cover (1100) may be formed as a curved surface. Specifically, the upper surface (1122) of the upper region (1120) of the impeller cover (1100) may be formed as a curved surface. The region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) may have a radius of curvature (R3) that becomes smaller as it goes upward in the axial direction. The region (1124) from the axial upper end to the radially inner end of the impeller cover (1100) may have a partial elliptical shape.

[0116] Fig. 14 is a cross-sectional view of a motor according to the fourth embodiment of the present specification. Fig. 15 is a cross-sectional view of an impeller cover of a motor according to the fourth embodiment of the present specification.

[0117] Referring to FIGS. 14 and 15, a motor (10) according to the fourth embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0118] The detailed configuration of the motor (10) according to the fourth embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the first embodiment of the present specification.

[0119] The upper surface (1122) of the impeller cover (1100) may be formed into a curved surface. Specifically, the upper surface (1122) of the upper region (1120) of the impeller cover (1100) may be formed into a curved surface.

[0120] The impeller cover (1100) may include a tapered surface (1224) that is arranged axially downward as it goes radially inward from the upper surface (1122), and a curved surface formed in a region (1228) from the tapered surface (1224) to the radially inner end. The cross-section of the tapered surface (1224) may be a straight line forming a constant angle with the axial direction. The curved surface formed in the region (1228) from the tapered surface (1224) to the radially inner end may have a constant radius of curvature (R4). In this case, since the axial length of the impeller cover (1100) is increased compared to the motor (10) according to the first embodiment, the air flow introduced into the impeller cover (1100) may be improved.

[0121] FIG. 16 is a drawing showing the flow of air passing through a motor according to embodiments of the present specification.

[0122] Referring to FIG. 16, it can be seen that the air passing through the motor (10) according to the first to fourth embodiments of the present specification rapidly gathers in the space between the impeller cover (1100) and the impeller (600). That is, since the air flow can be improved through the motor (10) according to the embodiments of the present specification, the heat dissipation effect of the internal components of the motor (10) can be improved.

[0123] Fig. 17 is a perspective view of a part of a motor according to the fifth embodiment of the present specification.

[0124] Referring to FIG. 17, a motor (10) according to the fifth embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0125] The detailed configuration of the motor (10) according to the fifth embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the first embodiment of the present specification.

[0126] The cylindrical portion (450) can connect a plurality of first leg portions (430). The cylindrical portion (450) can extend in the circumferential direction. The cylindrical portion (450) can be formed in the vertical central region of the first leg portion (430). Through this, the rigidity of the first housing (400) can be further improved, and vibrations generated during the operation of the motor (10) can be reduced. In this case, unlike the motor (10) according to the first embodiment, the radially inner surface of the cylindrical portion (450) structurally does not come into contact with the radially outer surface of the second leg portion (1200).

[0127] Fig. 18 is a perspective view of a part of a motor according to the sixth embodiment of the present specification.

[0128] Referring to FIG. 18, a motor (10) according to the sixth embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0129] The detailed configuration of the motor (10) according to the sixth embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the first embodiment of the present specification.

[0130] The first leg portion (430) of the first housing (400) of the sixth embodiment may extend axially downwards further than the first leg portion (430) of the first housing (400) of the first embodiment. The first leg portion (430) may extend downwards to cover the entire outer area of ​​the second leg portion (1200). In this case, the circumferential portion (450) may include a plurality of circumferential portions (451, 452, 453, 454) spaced apart axially.

[0131] Fig. 19 is a perspective view of a part of a motor according to the seventh embodiment of the present specification.

[0132] Referring to FIG. 19, a motor (10) according to the seventh embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0133] The detailed configuration of the motor (10) according to the seventh embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the first embodiment of the present specification.

[0134] The first leg portion (430) of the first housing (400) of the seventh embodiment may extend axially downwards further than the first leg portion (430) of the first housing (400) of the first embodiment. The first leg portion (430) may extend downwards to cover the entire outer area of ​​the second leg portion (1200). The circumferential portion (450) may connect a plurality of first leg portions (430) and may be formed in an overall cylindrical shape. In this case, the circumferential portion (450) may be formed with a plurality of holes (455) that penetrate the circumferential portion (450) in a radial direction. The shape of the holes (455) may be an oval shape. Alternatively, the holes (455) may be formed in a polygonal shape. The plurality of holes (455) may each include a plurality of first holes spaced apart vertically and a plurality of second holes spaced apart circumferentially.

[0135] Fig. 20 is a perspective view of a part of a motor according to the eighth embodiment of the present specification.

[0136] Referring to FIG. 19, a motor (10) according to the eighth embodiment of the present specification may include a rotation shaft (100), a rotor (200), a stator assembly (300), a first housing (400), a first bearing (500), an impeller (600), a diffuser (700, 800), a second bearing (900), and a second housing (1000), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

[0137] The detailed configuration of the motor (10) according to the eighth embodiment of the present specification, which is not described below, can be understood to be the same as the detailed configuration of the motor (10) according to the seventh embodiment of the present specification.

[0138] The circumferential portion (450) may be formed with a plurality of holes (456) that penetrate the circumferential portion (450) in a radial direction. The holes (456) may be formed in a circular shape. The plurality of holes (456) may each include a plurality of first holes spaced apart in a vertical direction and a plurality of second holes spaced apart in a circumferential direction.

[0139] 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. 1st housing; A rotary shaft rotatably coupled to the first housing; A rotor coupled to the above rotation axis; A stator assembly coupled to the first housing and positioned radially outside the rotor; an impeller coupled to the axial lower region of the above rotating shaft; and A second housing coupled to the first housing and surrounding the impeller, The first housing includes a bearing housing to which the rotation axis is rotatably coupled, and a plurality of first leg portions extending axially downward from the radially outer side of the bearing housing and spaced apart in the circumferential direction, The second housing includes an impeller cover surrounding the impeller, and a plurality of second leg portions extending axially upward from an outer surface of the impeller cover and coupled to the plurality of first leg portions, A motor in which the upper end of the impeller cover is positioned axially lower than the stator assembly, and the plurality of second leg portions are positioned radially outer than the stator assembly.

2. In paragraph 1, A motor in which the upper surface of the above impeller cover directly faces the lower surface of the above stator assembly.

3. In paragraph 1, The above impeller cover is a motor that does not overlap with the above stator assembly in a direction perpendicular to the axial direction.

4. In paragraph 1, The above plurality of second leg portions are spaced apart in the circumferential direction, Each of the above plurality of second leg sections is a motor that directly faces each other in the circumferential direction.

5. In paragraph 1, A motor in which the axial upper region of the impeller cover is formed to have a smaller inner diameter than the axial lower region of the impeller cover.

6. In paragraph 1, The impeller cover includes an overlapping area that overlaps the impeller in a direction perpendicular to the axial direction, and an upper area that extends axially upward from the overlapping area, A motor in which the inner diameter of the upper region increases as it goes upward in the axial direction.

7. In paragraph 6, The upper surface of the upper region is formed into a curved surface, A motor having a constant radius of curvature in the area from the axial top to the radial inner end of the upper region.

8. In paragraph 6, The upper surface of the upper region is formed into a curved surface, A motor in which the radius of curvature increases as it goes upward in the axial direction from the axial top to the radial inner end of the upper region.

9. In paragraph 6, The upper surface of the upper region is formed into a curved surface, A motor in which the radius of curvature of the region from the axial top to the radial inner end of the upper region becomes smaller as it goes upward in the axial direction.

10. In paragraph 6, A motor in which the upper region includes a tapered surface that is positioned axially downward as it becomes radially inward from the upper surface.

11. In paragraph 10, The upper region includes a curved surface formed from the tapered surface to the radially inner end, The above curved surface is a motor having a constant radius of curvature.

12. In paragraph 6, The outer diameter of the upper region above is a constant motor.

13. In paragraph 6, A motor in which the inner diameter of the above-mentioned overlapping area decreases as it goes upward in the axial direction.

14. In paragraph 1, The above plurality of second leg portions include a first connecting portion protruding in a radially inner region, The above stator assembly, A stator core arranged radially outside the rotor, A coil wound on the above stator core, Including an insulator coupled to the stator core, A motor having a radially outer surface of an axial lower region of the insulator formed to be concave radially inward and including a second coupling portion coupled to the first coupling portion.

15. In paragraph 1, The first housing further includes a circular cylindrical portion extending in a circumferential direction and connecting the plurality of first leg portions, The plurality of first leg portions are formed concavely in the radially outer direction from the radially inner side, and include a third connecting portion to which the plurality of second leg portions are connected. A motor in which the radially outer surface of the second leg portion is in contact with the radially inner surface of the cylindrical portion.

16. In paragraph 15, A motor wherein the above-mentioned cylindrical portion includes a plurality of cylindrical portions spaced apart in the axial direction.

17. In paragraph 1, The first housing includes a plurality of connecting portions connecting the bearing housing and the plurality of first leg portions, A fourth connecting portion extending axially downward from the plurality of connecting portions and extending radially inward from the plurality of first leg portions is included. The above stator assembly, A stator core arranged radially outside the rotor, A coil wound on the above stator core, Including an insulator coupled to the stator core, A motor having a radially outer surface of the axial upper region of the insulator formed to be concave radially inward and including a fifth coupling portion on which the fourth coupling portion is seated.

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

19. In paragraph 1, The first housing further includes a cylindrical portion connecting the plurality of first leg portions and extending in the circumferential direction, A motor in which the above-mentioned circumferential portion includes a plurality of holes penetrating the above-mentioned circumferential portion in a radial direction.

20. In paragraph 1, A diffuser coupled to the second housing and having the rotation axis rotatably coupled thereto, The impeller cover includes an overlapping area that overlaps the impeller in a direction perpendicular to the axial direction, and a lower area that extends axially downward from the overlapping area, A motor including a sixth joint portion in which the lower region is formed concavely from a radially inner side to a radially outer side, and to which the radially outer side of the diffuser is joined.

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