Motor

Abstract

A motor is provided. A motor according to an aspect of the present invention may include: a first cover; a rotating shaft rotatably coupled to the first cover; a rotor coupled to the rotating shaft; a stator assembly coupled to the first cover body and disposed on the outside in the radial direction of the rotor; an impeller coupled to a lower region in the axial direction of the rotating shaft; the second cover body is combined with the first cover body and surrounds the impeller; the first cover body may include a bearing cover body to which the rotating shaft is rotatably coupled, and a plurality of first leg portions extending from a radially outer side of the bearing cover body toward an axially lower portion and spaced apart in a circumferential direction; the second cover body comprises an impeller cover surrounding the impeller and a plurality of second leg parts which extend from the outer side surface of the impeller cover to the axial upper part and are combined with the plurality of first leg parts; the upper end of the impeller cover can be arranged on the axial lower portion of the stator assembly, and the plurality of second legs can be arranged on the radial outer side of the stator assembly.

Description

Technical Field

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

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

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

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

[0005] Existing vacuum cleaner motors include a rotating shaft that rotates together with the rotor, an impeller connected to the rotating shaft, a first housing that supports the stator, and a second housing that surrounds the impeller.

[0006] In this case, in order to combine the stator and the second cover, a portion of the first cover or the second cover will be configured between the impeller and the stator, resulting in increased flow resistance and thus a decrease in efficiency. Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] The problem to be solved by the present invention is to provide a motor that can improve flow path performance when the motor is running.

[0009] In addition, the problem to be solved by the present invention is to provide a motor that can improve space efficiency by shortening the axial length of the motor.

[0010] In addition, the problem to be solved by the present invention is to provide a motor that can reduce material costs.

[0011] In addition, the problem to be solved by the present invention is to provide a motor whose internal structure can be visually inspected.

[0012] Technical solutions to the problem

[0013] A motor according to one aspect of the invention for addressing the aforementioned problem includes: a first housing; a rotating shaft rotatably coupled to the first housing; a rotor coupled to the rotating shaft; a stator assembly coupled to the first housing and disposed radially outside the rotor; an impeller coupled to the axially lower region of the rotating shaft; and a second housing coupled to the first housing and surrounding the impeller.

[0014] In this case, the first cover may include a bearing cover rotatably coupled to the rotating shaft and a plurality of first legs extending radially outward and axially downward from the bearing cover and spaced circumferentially; the second cover may include an impeller cover surrounding the impeller and a plurality of second legs extending axially upward from the outer side of the impeller cover and coupled to the plurality of first legs.

[0015] Additionally, the upper end of the impeller cover may be disposed on the lower axial portion of the stator assembly, and a plurality of the second legs may be disposed on the outer radial portion of the stator assembly.

[0016] This improves flow path performance when the motor is running.

[0017] In addition, the top surface of the impeller cover can directly face the bottom surface of the stator assembly.

[0018] Therefore, space efficiency can be improved by shortening the axial length of the motor.

[0019] In addition, the impeller cover may not overlap with the stator assembly in a direction perpendicular to the axial direction.

[0020] Furthermore, the plurality of second legs may be spaced apart circumferentially; each of the plurality of second legs may be directly facing each other circumferentially.

[0021] This reduces the material cost of the motor.

[0022] In addition, the inner diameter of the upper axial region of the impeller cover can be made smaller than the inner diameter of the lower axial region of the impeller cover.

[0023] Additionally, the impeller cover may include an overlapping region that overlaps with the impeller in a direction perpendicular to the axial direction, and an upper region that extends axially upward from the overlapping region; the inner diameter of the upper region increases as it approaches the axial direction.

[0024] In addition, the top surface of the upper region can be formed as a curved surface; the region from the axial upper end to the radial inner end of the upper region can have a constant radius of curvature.

[0025] In addition, the top surface of the upper region can be formed as a curved surface; the region from the upper axial end to the inner radial end of the upper region has a larger radius of curvature as it gets closer to the upper axial end.

[0026] In addition, the top surface of the upper region can be formed as a curved surface; the radius of curvature of the region from the upper axial end to the inner radial end of the upper region becomes smaller as it gets closer to the upper axial end.

[0027] Additionally, the upper region may include a tapered surface that is positioned axially downwards from the top surface as it moves towards the radially inward direction.

[0028] In this case, the upper region may include a curved surface extending from the conical surface to the radially inner end; the curved surface may have a constant radius of curvature.

[0029] In addition, the outer diameter of the upper region can be constant.

[0030] In addition, the inner diameter of the overlapping region decreases as it gets closer to the upper part of the axis.

[0031] Additionally, the plurality of second legs may include a first joint protruding toward a radially inward region; the stator assembly may include: a stator core disposed radially outward of the rotor; a coil wound around the stator core; and an insulator coupled to the stator core.

[0032] In this case, the radially outer surface of the axially lower region of the insulator may include a second joint that is recessed radially inward and engages with the first joint.

[0033] Additionally, the first cover may include a ring-shaped circumferential portion that connects a plurality of the first legs and extends circumferentially; the plurality of first legs may include a third joining portion that is recessed from the radially inner side toward the radially outer side and joined with a plurality of second legs.

[0034] In this case, the radially outer surfaces of the plurality of second legs can contact the radially inner surfaces of the circumferential portion.

[0035] Additionally, the circumferential portion may include a plurality of circumferential portions spaced apart along the axial direction.

[0036] Additionally, the first cover may include the bearing cover and a plurality of connecting portions connecting the plurality of first legs, and may include a fourth connecting portion extending axially downward from the plurality of connecting portions and extending radially inward from the plurality of first legs.

[0037] 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.

[0038] In this case, the radially outer surface of the axially upper region of the insulator may include a fifth joint that is recessed radially inward and has the fourth joint disposed thereon.

[0039] Additionally, the impeller may be located downstream of the flow path formed by the rotation of the impeller.

[0040] Additionally, the first cover may include a circumferential portion that connects a plurality of the first legs and extends circumferentially; the circumferential portion may include a plurality of holes that penetrate the circumferential portion radially.

[0041] Alternatively, a diffuser may be included that is attached to the second cover and rotatably attached to the rotating shaft.

[0042] In this case, the impeller cover may include an overlapping region that overlaps with the impeller in a direction perpendicular to the axial direction and a lower region extending axially downward from the overlapping region; the lower region may include a sixth joint portion formed by recessing from the radially inner side to the radially outer side of the diffuser and joined thereto.

[0043] Invention Effects

[0044] This invention provides a motor that can improve flow path performance during motor operation.

[0045] In addition, this invention provides a motor that can improve space efficiency.

[0046] In addition, this invention provides a motor that can reduce material costs.

[0047] Furthermore, this invention provides a motor whose internal structure can be visually inspected. Attached Figure Description

[0048] Figure 1 This is a perspective view of the motor according to the first embodiment of the present invention.

[0049] Figure 2 This is an exploded perspective view of the motor according to the first embodiment of the present invention.

[0050] Figure 3 This is a cross-sectional view of the motor according to the first embodiment of the present invention.

[0051] Figure 4 and Figure 5 This is a perspective view of the second housing of the motor according to the first embodiment of the present invention.

[0052] Figure 6 and Figure 7 This is a perspective view of the first housing of the motor according to the first embodiment of the present invention.

[0053] Figure 8 This is a cross-sectional view of a portion of the second housing of the motor according to the first embodiment of the present invention.

[0054] Figure 9 This is a perspective view of the stator assembly of a motor according to the first embodiment of the present invention.

[0055] Figure 10 This is a cross-sectional view of the motor according to the second embodiment of the present invention.

[0056] Figure 11 This is a cross-sectional view of the impeller cover of the motor according to the second embodiment of the present invention.

[0057] Figure 12 This is a cross-sectional view of the motor according to the third embodiment of the present invention.

[0058] Figure 13 This is a cross-sectional view of the impeller cover of the motor according to the third embodiment of the present invention.

[0059] Figure 14 This is a cross-sectional view of the motor according to the fourth embodiment of the present invention.

[0060] Figure 15 This is a cross-sectional view of the impeller cover of the motor according to the fourth embodiment of the present invention.

[0061] Figure 16 This is a diagram illustrating the airflow via a motor according to an embodiment of the present invention.

[0062] Figure 17 This is a perspective view of a portion of the motor according to the fifth embodiment of the present invention.

[0063] Figure 18 This is a perspective view of a portion of the motor according to the sixth embodiment of the present invention.

[0064] Figure 19 This is a perspective view of a portion of the motor according to the seventh embodiment of the present invention.

[0065] Figure 20 This is a perspective view of a portion of the motor according to the eighth embodiment of the present invention. Detailed Implementation

[0066] Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary accompanying drawings. When assigning reference numerals to the constituent elements of the various drawings, care should be taken to minimize the use of identical reference numerals for the same constituent elements, even if they appear in different drawings. Furthermore, when describing embodiments of the present invention, detailed descriptions of related well-known structures or functions will be omitted if it is determined that such detailed descriptions would hinder understanding of the embodiments of the present invention.

[0067] Figure 1 This is a perspective view of the motor according to the first embodiment of the present invention. Figure 2 This is an exploded perspective view of the motor according to the first embodiment of the present invention. Figure 3 This is a cross-sectional view of the motor according to the first embodiment of the present invention. Figure 4 and Figure 5 This is a perspective view of the second housing of the motor according to the first embodiment of the present invention. Figure 6 and Figure 7 This is a perspective view of the first housing of the motor according to the first embodiment of the present invention. Figure 8 This is a cross-sectional view of the impeller cover of the motor according to the first embodiment of the present invention. Figure 9 This is a perspective view of the stator assembly of a motor according to the first embodiment of the present invention.

[0068] Reference Figures 1 to 9 The motor 10 of one embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0069] Motor 10 can be a suction motor for a vacuum cleaner. Motor 10 can draw external dust into the vacuum cleaner by generating suction force. The detailed configuration of motor 10 can be configured to form a reverse flow path based on the rotation axis 100. Specifically, impeller 600 can be configured downstream of the flow path formed by the rotation of impeller 600 connected to the rotation axis 100. In other words, as impeller 600 rotates, air outside motor 10 can be drawn into the interior of motor 10, and the airflow path inside motor 10 can be formed sequentially via first housing 400, stator assembly 300, impeller 600, diffuser 700, and 800. Thus, compared to a motor configured with a forward flow path, the heat dissipation effect of the heat generated by the electromagnetic interaction between rotor 200 and stator assembly 300 can be improved.

[0070] The rotation shaft 100 can extend axially. In this invention, axial direction can be interpreted as... Figures 1 to 3The vertical direction or up-down direction is used as a reference. Furthermore, in this invention, the axial upper part refers to direction 'A', and the axial lower part refers to direction 'B'.

[0071] The rotating shaft 100 can be formed in a cylindrical shape. A rotor 200 can be attached to the outer circumferential surface of the rotating shaft 100. The rotating shaft 100 can rotate in one direction or another by rotating the rotor 200. An impeller 600 can be attached to the outer circumferential surface of the rotating shaft 100. The impeller 600 can rotate in one direction or another by rotating the rotating shaft 100. The rotating shaft 100 can be rotatably connected to the first cover 400 via a first bearing 500. The rotating shaft 100 can be rotatably connected to the diffusers 700 and 800 via a second bearing 900.

[0072] The rotor 200 may face the stator assembly 300. The rotor 200 may be disposed within the space where the stator assembly 300 is formed. The rotor 200 may be formed in a cylindrical shape. The rotor 200 may rotate in one direction or another through electromagnetic interaction with the stator core 310 of the stator assembly 300. Specifically, if a magnetic field is formed in the stator core 310 by a coil 320 wound around the stator core 310, the rotor 200 will rotate in one direction or another through the resulting electromagnetic interaction. The rotor 200 may be disposed between the first bearing 500 and the second bearing 900.

[0073] The stator assembly 300 may be integrated into the first enclosure 400 and / or the second enclosure 1000. The stator assembly 300 may be referred to as the 'stator'. The stator assembly 300 may include a stator core 310, a coil 320, and an insulator 330.

[0074] The stator core 310 can be disposed radially outside the rotor 200 and facing the rotor 200. A coil 320 can be wound around the stator core 310. The stator core 310 can be formed of a conductive material.

[0075] Insulator 330 can surround stator core 310. Insulator 330 can be formed of insulating material.

[0076] The first cover 400 may include a first leg 430. The first leg 430 may extend radially outward from the bearing cover 410 toward an axially downward direction. The first leg 430 may extend radially outward from the connecting portion 420 toward an axially downward direction. The first leg 430 may extend in a vertical direction. The first leg 430 may be coupled to the second cover 1000. The first leg 430 may include a plurality of circumferentially spaced first legs 430. In this specification, the example of three first legs 430 is given, but it is not limited thereto, and the number of first legs 430 may be varied in various ways.

[0077] The insulator 330 may include an upper region 332. The upper region 332 of the insulator 330 may be disposed axially above the stator core 310. The upper region 332 of the insulator 330 may be coupled to a first cover 400. The upper region 332 of the insulator 330 may be coupled to a first leg 430 of the first cover 400. The radially outer surface of the upper region 332 of the insulator 330 may include a fifth coupling portion 3322 recessed radially inward. A fourth coupling portion 440 of the first cover 400 may be coupled to the fifth coupling portion 3322. The fourth coupling portion 440 of the first cover 400 may be disposed in the fifth coupling portion 3322. For example, the fourth coupling portion 440 of the first cover 400 may be inserted into the fifth coupling portion 3322.

[0078] The insulator 330 may include a lower region 334. The lower region 334 of the insulator 330 may be disposed axially below 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 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 recessed radially inward. A first coupling portion 1220 of the second leg 1200 of the second housing 1000 may be coupled to the second coupling portion 3342. For example, the first coupling portion 1220 may be inserted into the second coupling portion 3342.

[0079] The first cover 400 can be coupled to the stator assembly 300. The first cover 400 can be coupled to the insulator 330. The first cover 400 can surround the stator core 310. A rotating shaft 100 can be rotatably coupled to the first cover 400. A first bearing 500 can be coupled to the first cover 400.

[0080] The first housing 400 may include a bearing housing 410. The bearing housing 410 may be disposed axially above the stator assembly 300. The bearing housing 410 may be formed in a cylindrical or annular shape. The bearing housing 410 may be penetrated by a rotating shaft 100. The bearing housing 410 may include a rotating shaft hole 412 through which the rotating shaft 100 passes. A first bearing 500 may be fitted into the bearing housing 410. The bearing housing 410 may include a bearing groove 414 formed by recesses from the bottom surface toward the axially upward side or from the radially inner side surface toward the radially outer side. The first bearing 500 may be fitted into the bearing groove 414. The rotating shaft 100 may be rotatably fitted into the bearing housing 410 via the first bearing 500.

[0081] The first housing 400 may include a connecting portion 420. The connecting portion 420 may extend radially outward from the radially outer side surface or outer peripheral surface of the bearing housing 410. The connecting portion 420 may connect the bearing housing 410 and the first leg 430. The connecting portion 420 may include a plurality of connecting portions 420 connecting the bearing housing 410 and a plurality of first legs 430.

[0082] The first leg 430 can be engaged with the second leg 1200 of the second cover 1000. The first leg 430 can be engaged with the second leg 1200 of the second cover 1000 by means of a fastening member (not shown). For this purpose, a first fastening hole 432 can be formed in the first leg 430.

[0083] The first leg 430 may include a third engagement portion 434 recessed from a radially inner side toward a radially outer region. A second leg 1200 may be engaged at the third engagement portion 434. Specifically, the third engagement portion 434 may contact the radially outer side of the second leg 1200, and may contact portions of both sides connected to the radially outer side of the second leg.

[0084] The first cover 400 may include a fourth connecting portion 440. The fourth connecting portion 440 extends axially downward from the connecting portion 420. The fourth connecting portion 440 extends radially inward from the first leg 430. While extending axially downward from the connecting portion 420, the fourth connecting portion 440 also extends radially inward from the first leg 430. The fourth connecting portion 440 may connect to a fifth connecting portion 3322 in the upper region 332 of the insulator 330. The radially inner surface of the fourth connecting portion 440 may contact the fifth connecting portion 3322. A portion of each of the two sides connected to the radially inner surface of the fourth connecting portion 440 may contact the fifth connecting portion 3322.

[0085] The first cover 400 may include a circumferential portion 450. The circumferential portion 450 may extend circumferentially. The circumferential portion 450 may connect a plurality of first legs 430. The circumferential portion 450 may be formed in an annular shape. This can improve the rigidity of the first cover 400. The radially inner surface of the circumferential portion 450 may contact the radially outer surface of the second leg 1200.

[0086] The first bearing 500 can be disposed on the upper axial part of the stator assembly 300. The first bearing 500 can be formed in an annular shape.

[0087] Impeller 600 can be disposed in the lower axial region of rotating shaft 100. Impeller 600 can be disposed between stator assembly 300 and second bearing 900. Impeller 600 can be surrounded by second cover 1000. Specifically, impeller 600 can be disposed radially inside the overlapping region 1110 of impeller cover 1100 and surrounded by impeller cover 1100. The diameter of impeller 600 can decrease as it moves closer to the upper axial region. Impeller 600 can generally be formed into a conical shape with a central opening. A plurality of impeller blades can be formed on the radially outer surface of impeller 600, protruding radially outward and spaced circumferentially.

[0088] Diffusers 700 and 800 can be configured on the axial lower part of impeller 600. Diffusers 700 and 800 can be connected to the impeller cover 1100 of the second cover 1000. Diffusers 700 and 800 can be connected to the sixth connection part 1132 of impeller cover 1100.

[0089] The diffusers 700 and 800 may include a first diffuser 700 disposed on the axially lower part of the impeller 600 and a second diffuser 800 disposed on the axially lower part of the first diffuser 700.

[0090] A second bearing 900 may be incorporated into the first diffuser 700. A rotating shaft 100 may be rotatably incorporated into the first diffuser 700. The first diffuser 700 may be incorporated into the sixth joint 1132 of the impeller cover 1100. The first diffuser 700 may include a first diffuser body 710 rotatably incorporated into the rotating shaft 100 via the second bearing 900, a plurality of first guide vanes 720 disposed in the radially outer region of the first diffuser body 710 and spaced circumferentially, and a first outer surface 730 connecting the radially outer ends of the plurality of first guide vanes 720 and connecting them circumferentially. The first outer surface 730 may be incorporated into the sixth joint 1132 of the impeller cover 1100.

[0091] The second diffuser 800 may be combined with the first diffuser 700. The second diffuser 800 may include a second diffuser body 810, a plurality of second guide blades 820 disposed in the radially outer region of the second diffuser body 810 and spaced apart circumferentially, and a second outer surface 830 connecting the radially outer ends of the plurality of second guide blades 820 and connecting them circumferentially.

[0092] The number and shape of the first guide vane 720 and the second guide vane 820 can be different from each other. Thus, the first guide vane 720 and the second guide vane 820 can improve the efficiency of the airflow formed by the impeller 600.

[0093] The second bearing 900 can be coupled to diffusers 700 and 800. The second bearing 900 can be positioned below impeller 600. The second bearing 900 can be coupled to the first diffuser 700. A rotating shaft 100 can be coupled to the second bearing 900. Thus, the second bearing 900 can rotatably connect the rotating shaft 100 to diffusers 700 and 800. The second bearing 900 can be formed in an annular shape.

[0094] The second cover 1000 can be combined with the first cover 400. The second cover 1000 can surround the impeller 600. Diffusers 700 and 800 can be combined with the second cover 1000.

[0095] The second cover 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 generally shaped such that its inner diameter decreases towards the axially upward portion. The impeller cover 1100 may also be generally shaped such that its outer diameter decreases towards the axially upward portion. This improves the airflow efficiency created by the impeller 600 and enhances space efficiency.

[0096] The upper end of the impeller cover 1100 can be disposed on the lower axial part of the stator assembly 300. The upper end of the impeller cover 1100 can overlap with the stator assembly 300 in the axial direction. The top surface of the impeller cover 1100 can directly face the bottom surface of the stator assembly 300. That is, no configuration can be provided between the top surface of the impeller cover 1100 and the bottom surface of the stator assembly 300. Therefore, no resistance is provided between the top surface of the impeller cover 1100 and the stator assembly 300, thereby improving the flow path performance of the motor 10. Furthermore, space efficiency can be improved by shortening the axial length of the motor 10. The impeller cover 1100 can also not overlap with the stator assembly 300 in a direction perpendicular to the axial direction.

[0097] The impeller cover 1100 may include an overlapping area 1110, an upper area 1120, and a lower area 1130.

[0098] The overlapping area 1110 of the impeller cover 1100 may overlap with the impeller 600 in a direction perpendicular to the axial direction or radially. The inner diameter of the overlapping area 1110 of the impeller cover 1100 may decrease as it approaches the upper part of the axial direction. At least a portion of the overlapping area 1110 of the impeller cover 1100 may decrease in outer diameter as it approaches the upper part of 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 1200 may be disposed on the radially outer surface of the overlapping area 1110 of the impeller cover 1100.

[0099] The upper region 1120 of the impeller cover 1100 can be disposed above the overlapping region 1110. The upper region 1120 of the impeller cover 1100 can extend vertically. The upper region 1120 of the impeller cover 1100 can extend axially upward from the overlapping region 1110. The inner diameter of the upper region 1120 of the impeller cover 1100 can be smaller than the inner diameter of the lower region 1130 of the impeller cover 1100. The inner diameter of the upper region 1120 of the impeller cover 1100 can increase as it approaches the axially upward direction. The outer diameter of the upper region 1120 of the impeller cover 1100 can be constant.

[0100] The top surface 1122 of the impeller cover 1100 can be formed as a curved surface. Specifically, the top surface 1122 of the upper region 1120 of the impeller cover 1100 can be formed as a curved surface. The region 1124 from the axial upper end to the radial inner end of the impeller cover 1100 can have a constant radius of curvature R1. Since the region 1124 from the axial upper end to the radial inner end of the impeller cover 1100 has a constant radius of curvature R1, turbulence of air flowing into the inner side of the impeller cover 1100 can be prevented.

[0101] The lower region 1130 of the impeller cover 1100 can be disposed below the overlapping region 1110. The lower region 1130 of the impeller cover 1100 can extend vertically. The lower region 1130 of the impeller cover 1100 can extend axially downward from the overlapping region 1110. The inner diameter of the lower region 1130 of the impeller cover 1100 can be larger than the inner diameter of the upper region 1120 of the impeller cover 1100.

[0102] The lower region 1130 of the impeller cover 1100 may include a sixth joint 1132 formed by a recess from the radially inner side toward the radially outer side. A diffuser 700 or 800 may be joined to the sixth joint 1132. Specifically, the first outer side 730 of the first diffuser 700 may be joined to the sixth joint 1132.

[0103] The second cover 1000 may include a second leg 1200. The second leg 1200 may extend axially upward from the outer side of the impeller cover 1100. Specifically, the second leg 1200 may extend axially upward from the radially outer side of the overlapping region 1110 of the impeller cover 1100. The second leg 1200 may extend in a vertical direction. The second leg 1200 may be disposed radially outward of the stator assembly 300. This improves space efficiency.

[0104] The second leg 1200 can be coupled to the first cover 400. The second leg 1200 can be coupled to the first leg 430 of the first cover 400. The second leg 1200 can be coupled to the third coupling portion 434 of the first leg 430 of the first cover 400. The radially outer side of the second leg 1200 can contact the third coupling portion 434. A portion of the two sides connected to the radially outer side of the second leg 1200 can contact the third coupling portion 434. The radially outer side of the second leg 1200 can contact the radially inner side of the circumferential portion 450.

[0105] The second leg 1200 may include a leg body 1210 extending vertically from the outer side of the impeller cover 1100, a first joint 1220 protruding radially inward from the radially inner side of the leg body 1210, and a second fastening hole 1230 formed on the top surface of the leg body 1210.

[0106] The first joint 1220 can protrude radially inward from the second leg 1200. The first joint 1220 can be joined to the second joint 3342 of the lower region 334 of the insulator 330.

[0107] The second fastening hole 1230 may overlap with the first fastening hole 432 of the first leg 430 in the vertical or axial direction. The fastening member may pass through the first fastening hole 432 and be fastened to the second fastening hole 1230, thereby enabling the first leg 430 and the second leg 1200 to be joined.

[0108] The second leg 1200 may include a plurality of second legs 1200 spaced circumferentially. Each of the plurality of second legs 1200 may directly face each other. That is, the space between the plurality of second legs 1200 may be left unconfigured. This reduces the material cost of the motor 10. Furthermore, since the interior of the motor 10 can be visually inspected, it is easy to identify any malfunctions.

[0109] Generally, the motor 10 is disposed in a space isolated from the outside. That is, even if the space between the second legs 1200 is open, the motor 10 is disposed in a space isolated from the outside, so it does not significantly affect the flow of air through the motor 10 in the vertical direction.

[0110] In one embodiment of the present invention, the number of second legs 1200 is three, but it is not limited thereto, and the number of second legs 1200 can be varied in various ways.

[0111] Figure 10 This is a cross-sectional view of the motor according to the second embodiment of the present invention. Figure 11 This is a cross-sectional view of the impeller cover of the motor according to the second embodiment of the present invention.

[0112] Reference Figure 10 and Figure 11 The motor 10 of the second embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0113] The detailed configuration of the motor 10 of the second embodiment of the present invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 of the first embodiment of the present invention.

[0114] The top surface 1122 of the impeller cover 1100 can be formed as a curved surface. Specifically, the top surface 1122 of the upper region 1120 of the impeller cover 1100 can be formed as a curved surface. The radius of curvature R2 of the region 1124 from the axial upper end to the radial inner end of the impeller cover 1100 increases as it approaches the axial upper end. The region 1124 from the axial upper end to the radial inner end of the impeller cover 1100 can be a portion of an ellipse. Since the radius of curvature R2 of the region 1124 from the axial upper end to the radial inner end of the impeller cover 1100 decreases as it approaches the axial lower end, the airflow efficiency flowing into the inner side of the impeller cover 1100 can be improved.

[0115] Figure 12 This is a cross-sectional view of the motor according to the third embodiment of the present invention. Figure 13 This is a cross-sectional view of the impeller cover of the motor according to the third embodiment of the present invention.

[0116] Reference Figure 12 and Figure 13 The motor 10 of the third embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0117] The detailed configuration of the motor 10 in the third embodiment of the invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 in the first embodiment of the invention.

[0118] The top surface 1122 of the impeller cover 1100 can be formed as a curved surface. Specifically, the top surface 1122 of the upper region 1120 of the impeller cover 1100 can be formed as a curved surface. The region 1124 from the axial upper end to the radially inner end of the impeller cover 1100 can have a smaller radius of curvature R3 as it approaches the axial upper end. The region 1124 from the axial upper end to the radially inner end of the impeller cover 1100 can be a portion of an ellipse.

[0119] Figure 14 This is a cross-sectional view of the motor according to the fourth embodiment of the present invention. Figure 15 This is a cross-sectional view of the impeller cover of the motor according to the fourth embodiment of the present invention.

[0120] Reference Figure 14 and Figure 15 The motor 10 of the fourth embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0121] The detailed configuration of the motor 10 of the fourth embodiment of the present invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 of the first embodiment of the present invention.

[0122] The top surface 1122 of the impeller cover 1100 can be formed as a curved surface. Specifically, the top surface 1122 of the upper region 1120 of the impeller cover 1100 can be formed as a curved surface.

[0123] The impeller cover 1100 may include a tapered surface 1224 disposed axially downwards from the top surface 1122 towards the radially inner end, and a curved surface formed in the 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 predetermined 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, the axial length of the impeller cover 1100 is increased compared to the motor 10 of the first embodiment, thus improving the airflow into the interior of the impeller cover 1100.

[0124] Figure 16 This is a diagram illustrating the airflow via a motor according to an embodiment of the present invention.

[0125] Reference Figure 16It can be confirmed that the air passing through the motor 10 of the first to fourth embodiments of the present invention rapidly accumulates in the space between the impeller cover 1100 and the impeller 600. That is, the airflow can be increased by the motor 10 of the embodiments of the present invention, thereby improving the heat dissipation effect of the internal components of the motor 10.

[0126] Figure 17 This is a perspective view of a portion of the motor according to the fifth embodiment of the present invention.

[0127] Reference Figure 17 The motor 10 of the fifth embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0128] The detailed configuration of the motor 10 of the fifth embodiment of the present invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 of the first embodiment of the present invention.

[0129] The circumferential portion 450 can connect a plurality of first legs 430. The circumferential portion 450 can extend circumferentially. The circumferential portion 450 can be formed in the central region of the first leg 430 in the vertical direction. As a result, the rigidity of the first cover 400 can be further improved, and the vibration generated when the motor 10 is operated can be reduced. In this case, unlike the motor 10 in the first embodiment, the radially inner surface of the circumferential portion 450 does not structurally contact the radially outer surface of the second leg 1200.

[0130] Figure 18 This is a perspective view of a portion of the motor according to the sixth embodiment of the present invention.

[0131] Reference Figure 18 The motor 10 of the sixth embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0132] The detailed configuration of the motor 10 of the sixth embodiment of the present invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 of the first embodiment of the present invention.

[0133] In the sixth embodiment, the first leg 430 of the first cover 400 may extend axially downwards further than the first leg 430 of the first cover 400 in the first embodiment. The first leg 430 may extend downwards to completely cover the outer region of the second leg 1200. In this case, the circumferential portion 450 may include a plurality of circumferential portions 451, 452, 453, 454 spaced apart axially.

[0134] Figure 19 This is a perspective view of a portion of the motor according to the seventh embodiment of the present invention.

[0135] Reference Figure 19 The motor 10 of the seventh embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0136] The detailed configuration of the motor 10 of the seventh embodiment of the present invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 of the first embodiment of the present invention.

[0137] In the seventh embodiment, the first leg 430 of the first cover 400 may extend further axially downward than the first leg 430 of the first cover 400 in the first embodiment. The first leg 430 may extend downward to completely cover the outer region of the second leg 1200. The circumferential portion 450 may connect a plurality of first legs 430 and be integrally formed into a cylindrical shape. In this case, the circumferential portion 450 may be formed with a plurality of holes 455 extending radially through the circumferential portion 450. The shape of the holes 455 may be elliptical. Alternatively, the holes 455 may be polygonal. The plurality of holes 455 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.

[0138] Figure 20 This is a perspective view of a portion of the motor according to the eighth embodiment of the present invention.

[0139] Reference Figure 19 The motor 10 of the eighth embodiment of the present invention may include a rotating shaft 100, a rotor 200, a stator assembly 300, a first cover 400, a first bearing 500, an impeller 600, a diffuser 700, 800, a second bearing 900, and a second cover 1000, but may also be implemented by excluding some of the components, and additional components are not excluded.

[0140] The detailed configuration of the motor 10 of the eighth embodiment of the present invention, which is not described below, can be understood to be the same as the detailed configuration of the motor 10 of the seventh embodiment of the present invention.

[0141] The circumferential portion 450 may have a plurality of holes 456 extending radially through it. The holes 456 may be circular in shape. The plurality of holes 456 may include a plurality of first holes spaced apart in a vertical direction and a plurality of second holes spaced apart in a circumferential direction.

[0142] While embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above are exemplary in all respects and should not be construed as limiting.

Claims

1. A motor, wherein, include: First cover; A rotating shaft is rotatably coupled to the first cover. The rotor is coupled to the rotating shaft; A stator assembly, which is incorporated into the first housing and disposed radially outside the rotor; The impeller is coupled to the lower axial region of the rotating shaft; and The second cover is combined with the first cover and surrounds the impeller; The first cover includes a bearing cover rotatably coupled to the rotating shaft and a plurality of first legs extending radially outward and axially downward from the bearing cover and spaced apart circumferentially. The second cover includes an impeller cover surrounding the impeller and a plurality of second legs extending axially upward from the outer side of the impeller cover and engaging with the plurality of first legs; The upper end of the impeller cover is disposed on the lower axial part of the stator assembly, and a plurality of the second legs are disposed on the outer radial part of the stator assembly.

2. The motor according to claim 1, wherein, The top surface of the impeller cover faces directly onto the bottom surface of the stator assembly.

3. The motor according to claim 1, wherein, The impeller cover does not overlap with the stator assembly in a direction perpendicular to the axial direction.

4. The motor according to claim 1, wherein, A plurality of the second legs are spaced circumferentially; Each of the plurality of second legs faces each other directly in the circumferential direction.

5. The motor according to claim 1, wherein, The inner diameter of the upper axial region of the impeller cover is smaller than the inner diameter of the lower axial region of the impeller cover.

6. The motor according to claim 1, wherein, The impeller cover includes an overlapping region that overlaps with the impeller in a direction perpendicular to the axial direction, and an upper region that extends upward from the overlapping region in the axial direction. The inner diameter of the upper region increases as it gets closer to the axial direction at the top.

7. The motor according to claim 6, wherein, The top surface of the upper region is formed as a curved surface; The region from the axial upper end to the radial inner end of the upper region has a constant radius of curvature.

8. The motor according to claim 6, wherein, The top surface of the upper region is formed as a curved surface; The radius of curvature of the region from the upper axial end to the inner radial end of the upper region increases as it gets closer to the upper axial end.

9. The motor according to claim 6, wherein, The top surface of the upper region is formed as a curved surface; The radius of curvature of the region from the upper axial end to the inner radial end of the upper region decreases as it gets closer to the upper axial end.

10. The motor according to claim 6, wherein, The upper region includes a tapered surface that is positioned axially downwards from the top surface as it moves towards the radially inward direction.

11. The motor according to claim 10, wherein, The upper region includes a curved surface extending from the tapered surface to the radially inner end; The surface has a constant radius of curvature.

12. The motor according to claim 6, wherein, The outer diameter of the upper region is constant.

13. The motor according to claim 6, wherein, The inner diameter of the overlapping region decreases as it approaches the upper part of the axis.

14. The motor according to claim 1, wherein, The plurality of second legs include a first joint portion protruding toward a radially inward region; The stator assembly includes: The stator core is disposed radially outside the rotor; Coil, wound around the stator core; and An insulator, attached to the stator core; The radially outer surface of the axially lower region of the insulator includes a second joint that is recessed radially inward and engages with the first joint.

15. The motor according to claim 1, wherein, The first cover also includes a ring-shaped circumferential portion that connects a plurality of the first legs and extends circumferentially; The plurality of first legs include a third joining portion formed by a recess from a radially inner side toward a radially outer side and joined to the plurality of second legs; The radially outer surfaces of a plurality of the second legs contact the radially inner surfaces of the circumferential portion.

16. The motor according to claim 15, wherein, The circumferential portion includes a plurality of circumferential portions spaced apart along the axial direction.

17. The motor according to claim 1, wherein, The first cover includes the bearing cover and a plurality of connecting portions connecting the plurality of first legs, and includes a fourth connecting portion extending axially downward from the plurality of connecting portions and extending radially inward from the plurality of first legs; The stator assembly includes: The stator core is disposed radially outside the rotor; Coil, wound around the stator core; and An insulator, attached to the stator core; The radially outer surface of the axially upper region of the insulator includes a fifth joint that is recessed radially inward and where the fourth joint is disposed.

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

19. The motor according to claim 1, wherein, The first cover also includes a circumferential portion that connects a plurality of the first legs and extends circumferentially; The circumferential portion includes a plurality of holes that penetrate the circumferential portion radially.

20. The motor according to claim 1, wherein, Includes a diffuser that is attached to the second housing and rotatably attached to the rotating shaft; The impeller cover includes an overlapping region that overlaps with 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 includes a sixth junction formed by a recess from the radially inner side toward the radially outer side and incorporating the radially outer side of the diffuser.

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