Motor noise reduction structure, outer rotor motor and washing machine having the same

Abstract

The present application provides a motor noise reduction structure, comprising: a rotor assembly and a stator assembly; the rotor assembly includes a rotor housing, the rotor housing includes a housing end wall, and a ventilation opening is provided on the housing end wall; the maximum radial distance between the ventilation opening and the central axis of the housing end wall is a; the stator assembly is disposed inside the rotor housing; the stator assembly includes a stator yoke portion and a stator tooth portion; the minimum radial distance between the stator tooth portion and the central axis of the housing end wall is b; a < b. According to the motor noise reduction structure of the present application, when the motor rotates, it is possible to prevent the oncoming external air from directly impacting the stator and the winding part.

Description

Technical Field

[0001] The present application belongs to the technical field of washing machines, and in particular relates to a motor noise reduction structure, an outer rotor motor, and a washing machine having the same. Background Art

[0002] At present, with the development of science and technology, people's requirements for washing machine washing noise and washing efficiency are gradually increasing. The noise of washing machine motor is an important component of washing noise. Compared with belt-driven motors, the main shaft of direct-drive outer rotor motor and the main shaft of washing machine drum are integrated. When the motor rotates, it relies on the main shaft to directly drive the drum to rotate without belt transmission, which reduces the speed of direct-drive motor, reduces energy loss, improves the working efficiency of the motor, and reduces motor noise. It is increasingly favored by consumers.

[0003] However, when a direct-drive outer rotor motor rotates, the rotor housing structure has a significant impact on the fluid noise of the motor, and most existing direct-drive motor rotor housing structural designs do not take the fluid noise into consideration.

[0004] Therefore, how to provide a rotor housing, an outer rotor motor and a washing machine having the same that can effectively reduce fluid noise has become an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a motor noise reduction structure, an outer rotor motor and a washing machine having the same, which can effectively reduce fluid noise.

[0006] In order to solve the above problems, the present application provides a motor noise reduction structure, including:

[0007] The rotor assembly comprises a rotor housing, the rotor housing comprises a housing end wall, a vent is provided on the housing end wall, and the maximum radial distance between the vent and the central axis of the housing end wall is a;

[0008] and a stator assembly, the stator assembly is arranged inside the rotor housing; the stator assembly includes a stator yoke and a stator tooth; the minimum radial distance between the stator tooth and the central axis of the housing end wall is b; a <b。

[0009] Preferably, a plurality of vents are provided on the end wall of the shell, the area of ​​the end wall of the shell is S, and the area of ​​each vent is 1 / 100S to 1 / 110S.

[0010] Preferably, the shell end wall includes a first part, a ventilation area, a second part and an axial hole which are arranged in sequence from the edge of the end wall to the center position; the first part, the ventilation area and the second part are all arranged circumferentially around the axial hole; an axial hole outer wall is arranged in the axial hole; the inner circumferential side of the second part is connected to the axial hole outer wall; and a plurality of ventilation openings are arranged on the ventilation area.

[0011] Preferably, the inner surface of the first portion is planar.

[0012] Preferably, the ventilation area is formed by a plurality of air guide plates circumferentially arranged around the axial hole, and the ventilation opening is arranged between two adjacent air guide plates.

[0013] Preferably, radial reinforcing ribs are also provided on the end wall of the shell.

[0014] Preferably, the radial reinforcement rib comprises a first section and a second section connected in sequence toward the end wall edge; the first section is arranged at the outer edge of the ventilation zone, the second section extends to the first part, and the second section is arranged on the outer surface of the shell end wall.

[0015] Preferably, the first section penetrates the shell end wall and forms a first radial protrusion on the outer surface of the shell end wall; and the radial reinforcing rib forms a second radial protrusion on the inner surface of the shell end wall; the axial height of the first radial protrusion is e1, and the axial height of the second radial protrusion is e2; e1 <e2。

[0016] Preferably, a first circumferential reinforcing rib is further provided on the end wall of the shell, and the first circumferential reinforcing rib is provided at the connection between the ventilation area and the second part;

[0017] And / or, a second circumferential reinforcing rib is further provided on the end wall of the shell, and the second circumferential reinforcing rib is provided on the ventilation area;

[0018] And / or, a third circumferential reinforcement rib is further arranged on the end wall of the shell, and the third circumferential reinforcement rib is arranged at the connection between the ventilation area and the first part.

[0019] Preferably, the first circumferential reinforcing rib penetrates the shell end wall and forms a first circumferential protrusion on the outer surface of the shell end wall; and the first circumferential reinforcing rib forms a second circumferential protrusion on the inner surface of the shell end wall; the axial height of the first circumferential protrusion is c1, and the axial height of the second circumferential protrusion is d1; c1 <d1;

[0020] And / or, the second circumferential reinforcing rib penetrates the shell end wall and forms a third circumferential protrusion on the outer surface of the shell end wall; the second circumferential reinforcing rib forms a fourth circumferential protrusion on the inner surface of the shell end wall; the axial height of the third circumferential protrusion is c2, and the axial height of the fourth circumferential protrusion is d2; c2 <d2;

[0021] and / or, the third circumferential reinforcing rib penetrates the shell end wall and forms a fifth circumferential protrusion on the outer surface of the shell end wall; the third circumferential reinforcing rib forms a sixth circumferential protrusion on the inner surface of the shell end wall; the circumferential height of the fifth circumferential protrusion is c3, and the axial height of the sixth circumferential protrusion is d3; c3 <d3。

[0022] Preferably, the thickness of the housing end wall is uniform, and the housing end wall is inclined toward the outside of the rotor housing from the edge to the center relative to the cross section of the rotor housing.

[0023] Preferably, the inclination angle is 0.8° to 3°.

[0024] According to another aspect of the present application, an outer rotor motor is provided, including a motor noise reduction structure, and the motor noise reduction structure is the above-mentioned motor noise reduction structure.

[0025] According to another aspect of the present application, a washing machine is provided, comprising an outer rotor motor, wherein the outer rotor motor is the outer rotor motor described above.

[0026] The motor noise reduction structure provided in the present application is provided with a ventilation hole on the shell end wall, and the distance between the ventilation hole and the center axis of the shell end wall is smaller than the distance between the stator tooth part and the center axis of the shell end wall. When the motor rotates, the external air flow is prevented from directly impacting the stator and winding parts, thereby effectively reducing the fluid noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of the motor noise reduction structure according to an embodiment of the present application;

[0028] Figure 2 This is a schematic structural diagram of a shell end wall according to an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the internal structure of a rotor housing according to an embodiment of the present application;

[0030] Figure 4 A cross-sectional view of a motor noise reduction structure according to an embodiment of the present application;

[0031] Figure 5 for Figure 4 Enlarged view of area A in the middle.

[0032] The reference numerals are as follows:

[0033] 1. Rotor housing; 2. Stator assembly; 3. Housing end wall; 31. Ventilation opening; 32. First part; 33. Ventilation area; 34. Second part; 35. Shaft hole; 36. Wind guide plate; 4. Shaft hole outer wall; 51. First circumferential reinforcement rib; 52. Second circumferential reinforcement rib; 53. Third circumferential reinforcement rib; 6. Radial reinforcement rib; 61. First section; 62. Second section. DETAILED DESCRIPTION

[0034] See also Figure 1-2As shown, according to an embodiment of the present application, a motor noise reduction structure includes: a rotor assembly and a stator assembly 2. The rotor assembly includes a rotor housing 1, and the rotor housing 1 includes a housing end wall 3. A ventilation opening 31 is provided on the housing end wall 3; the maximum radial distance between the ventilation opening 31 and the central axis of the housing end wall 3 is a; the stator assembly 2 is disposed inside the rotor housing 1; the stator assembly 2 includes a stator yoke portion and a stator tooth portion; the minimum radial distance between the stator tooth portion and the central axis of the housing end wall 3 is b; a < b; when the motor rotates, it avoids the direct impact of the incoming external air flow on the stator and winding parts, thereby effectively reducing the fluid noise.

[0035] Further, b - a = 3 mm to 10 mm. At this distance, it can effectively avoid the direct impact of the incoming external air flow on the stator and winding parts and reduce the fluid noise.

[0036] Further, a plurality of ventilation openings 31 are provided on the housing end wall 3. The area of the housing end wall 3 is S, and the area of each ventilation opening 31 is 1 / 100S to 1 / 110S. In this case, the air flow entering the interior of the rotor housing 1 during the high-speed rotation of the motor can be effectively controlled, the air vortex noise inside the rotor can be reduced, and this inlet design can reduce the area of the noise radiation outlet and reduce the radiation noise of the stator vibration.

[0037] Further, the plurality of ventilation openings 31 are circumferentially arranged around the shaft hole 35.

[0038] Combined with reference to Figure 2-3 As shown, the present application also discloses some embodiments. The housing end wall 1 includes a first part 32, a ventilation area 33, a second part 34, and a shaft hole 35 that are sequentially arranged from the end wall edge to the central position; the first part 32, the ventilation area 33, and the second part 34 are all circumferentially arranged around the shaft hole 35; a shaft hole outer wall 4 is provided in the shaft hole 35; the inner peripheral side of the second part 34 is connected to the shaft hole outer wall 4; a plurality of ventilation openings 31 are provided on the ventilation area 33.

[0039] Further, the inner surface of the first part 32 is a plane, and there are no other attachments that hinder the smooth flow of air on this plane, which can effectively reduce the air noise.

[0040] Further, the ventilation area 33 is formed by a plurality of air guiding plates 36 that are circumferentially arranged around the shaft hole 35, and the ventilation openings 31 are provided between two adjacent air guiding plates 36.

[0041] Further, the width of the ventilation opening 31 gradually increases toward the outer peripheral side of the housing end wall 3.

[0042] Further, radial reinforcing ribs 6 are also provided on the housing end wall 3, which can effectively enhance the stiffness of the rotor housing 1.

[0043] Furthermore, the radial reinforcing rib 6 includes a first section 61 and a second section 62 that are sequentially connected in the direction of the end wall edge; the first section 61 is disposed at the outer edge of the ventilation area 33, and the second section 62 extends to the first part 32; and the second section 62 is disposed on the outer surface of the housing end wall 3, and the second section 62 of the radial reinforcing rib 6 does not protrude on the inner surface of the first part 32 of the housing end wall 3, so that there are no radial reinforcing ribs 6 and any other attachments that impede the smooth flow of air on the first part 32, reducing air noise.

[0044] Furthermore, the first section 61 penetrates through the housing end wall 3 and forms a first radial protrusion on the outer surface of the housing end wall 3; and the radial reinforcing rib 6 forms a second radial protrusion on the inner surface of the housing end wall 3; the axial height of the first radial protrusion is e1, and the axial height of the second radial protrusion is e2; e1 < e2, so that the stirring air volume of the rotor can be reduced when the motor rotates at high speed, reducing air noise.

[0045] Furthermore, a first circumferential reinforcing rib 51 is further disposed on the housing end wall 3, and the first circumferential reinforcing rib 51 is disposed at the connection between the ventilation area 33 and the second part 34;

[0046] And / or, a second circumferential reinforcing rib 52 is further disposed on the housing end wall 3, and the second circumferential reinforcing rib 52 is disposed on the ventilation area 32;

[0047] And / or, a third circumferential reinforcing rib 53 is further disposed on the housing end wall 3, and the third circumferential reinforcing rib 53 is disposed at the connection between the ventilation area 33 and the first part 32.

[0048] Furthermore, the first circumferential reinforcing rib 51 penetrates through the housing end wall 3 and forms a first circumferential protrusion on the outer surface of the housing end wall 3; and the first circumferential reinforcing rib 51 forms a second circumferential protrusion on the inner surface of the housing end wall 3; the axial height of the first circumferential protrusion is c1, and the axial height of the second circumferential protrusion is d1; c1 < d1;

[0049] And / or, the second circumferential reinforcing rib 52 penetrates through the housing end wall 3 and forms a third circumferential protrusion on the outer surface of the housing end wall 3; the second circumferential reinforcing rib 52 forms a fourth circumferential protrusion on the inner surface of the housing end wall 3; the axial height of the third circumferential protrusion is c2, and the axial height of the fourth circumferential protrusion is d2; c2 < d2;

[0050] And / or, the third circumferential reinforcing rib 53 penetrates through the housing end wall 3 and forms a fifth circumferential protrusion on the outer surface of the housing end wall 3; the third circumferential reinforcing rib 53 forms a sixth circumferential protrusion on the inner surface of the housing end wall 3; the circumferential height of the fifth circumferential protrusion is c3, and the axial height of the sixth circumferential protrusion is d3; c3 < d3, which can not only effectively enhance the strength of the rotor housing 1 and prevent deformation problems caused by insufficient strength of the rotor housing 1, but also the protrusion of the circumferential reinforcing rib on the outer surface is lower than the protrusion formed on the inner surface, so that the stirring air volume of the rotor can be reduced when the motor rotates at high speed, and the air noise can be reduced.

[0051] Further, d1 - c1 = 1 mm to 4 mm; and / or, d2 - c2 = 1 mm to 4 mm; and / or, d3 - c3 = 1 mm to 4 mm. In this case of the height difference, the stirring air volume of the rotor can be better reduced, and while increasing the structural strength of the rotor housing of the direct-drive outer-rotor motor, the fluid noise during the operation of the motor is reduced.

[0052] Combined with reference to Figure 4 As shown, some embodiments are also disclosed in the present application. The thickness of the housing end wall is uniform, and the housing end wall 3 inclines towards the outside of the rotor housing 1 from the edge to the central position.

[0053] Combined with reference to Figure 5 As shown, some embodiments are also disclosed in the present application. The inclination angle is 0.8° to 3°. This inclination angle is beneficial to reducing the attachment area of the eddy current on the surface of the rotor housing 1 when the motor rotates at high speed, reducing the number of eddy currents, and reducing the eddy current noise during the rotation of the motor.

[0054] Further, a plurality of radial reinforcing ribs 6 are provided, and the plurality of radial reinforcing ribs 6 are circumferentially arranged around the shaft hole 35, further enhancing the strength of the rotor housing 1.

[0055] Further, the first end of each radial reinforcing rib 6 is connected to the outer wall 4 of the shaft hole, which can effectively enhance the stiffness of the rotor housing 1.

[0056] Further, the thickness of the housing end wall 3 is 3 mm to 5 mm.

[0057] The motor noise reduction structure provided by the present invention is used on the rotor of a washing machine direct-drive motor or other permanent magnet synchronous motors with the same function. A magnetic conduction ring is arranged on the inner side of the axially extending part of the rotor housing. The magnetic conduction ring is made of a magnetic conduction material. The inner surface of the magnetic conduction ring is provided with permanent magnets with opposite polarities in pairs adjacent to each other. The permanent magnets are radially equidistantly distributed around the central axis of the rotor housing to form a permanent magnet ring. A spline sleeve is installed in the shaft hole 35 of the rotor housing for installing a rotating shaft.

[0058] According to the embodiments of the present application, an outer-rotor motor includes a motor noise reduction structure, and the motor noise reduction structure is the above-mentioned motor noise reduction structure.

[0059] According to an embodiment of the present application, a washing machine includes an outer rotor motor, and the outer rotor motor is the outer rotor motor described above.

[0060] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0061] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A motor noise reduction structure, characterized in that: Includes: A rotor assembly, the rotor assembly comprising a rotor housing (1), the rotor housing (1) comprising a housing end wall (3), a vent (31) being provided on the housing end wall (3); the maximum radial distance between the vent (31) and the central axis of the housing end wall (3) being a; and a stator assembly (2), the stator assembly (2) being arranged inside the rotor housing (1); the stator assembly (2) comprising a stator yoke portion and a stator tooth portion; the minimum radial distance between the stator tooth portion and the central axis of the housing end wall (3) is b; a <b; The shell end wall (3) comprises a first portion (32), a ventilation area (33), a second portion (34) and an axial hole (35) which are arranged in sequence from the edge of the end wall to the center. The shell end wall (3) is also provided with radial reinforcing ribs (6); The radial reinforcing rib (6) comprises a first section (61) and a second section (62) which are connected in sequence towards the edge of the end wall; the first section (61) extends to the outer edge of the ventilation area (33); the second section (62) extends to the first portion (32), and the second section (62) is arranged on the outer surface of the shell end wall (3); The first section (61) penetrates the shell end wall (3) and forms a first radial protrusion on the outer surface of the shell end wall (3); and the radial reinforcing rib (6) forms a second radial protrusion on the inner surface of the shell end wall (3); the axial height of the first radial protrusion is e1, and the axial height of the second radial protrusion is e2; e1 <e2。 2. The motor noise reduction structure according to claim 1, characterized in that: A plurality of ventilation openings (31) are provided on the shell end wall (3); the area of ​​the shell end wall (3) is S, and the area of ​​each ventilation opening (31) is 1 / 100S to 1 / 110S.

3. The motor noise reduction structure according to claim 1, characterized in that: The first portion (32), the ventilation area (33) and the second portion (34) are all arranged circumferentially around the shaft hole (35); an shaft hole outer wall (4) is arranged in the shaft hole (35); the inner circumference of the second portion (34) is connected to the shaft hole outer wall (4); and a plurality of ventilation openings (31) are arranged on the ventilation area (33).

4. The motor noise reduction structure according to claim 3, characterized in that: The inner surface of the first part (32) is a plane.

5. The motor noise reduction structure according to claim 3, characterized in that: The ventilation area (33) is formed by a plurality of air guide plates (36) arranged circumferentially around the shaft hole (35), and the ventilation opening (31) is arranged between two adjacent air guide plates (36).

6. The motor noise reduction structure according to claim 3, characterized in that: The shell end wall (3) is further provided with a first circumferential reinforcing rib (51), wherein the first circumferential reinforcing rib (51) is provided at the connection between the ventilation area (33) and the second part (34); And / or, the shell end wall (3) is further provided with a second circumferential reinforcing rib (52), and the second circumferential reinforcing rib (52) is provided on the ventilation area (33); And / or, a third circumferential reinforcing rib (53) is further provided on the shell end wall (3), and the third circumferential reinforcing rib (53) is provided at the connection between the ventilation area (33) and the first part (32).

7. The motor noise reduction structure according to claim 6, characterized in that: The first circumferential reinforcing rib (51) penetrates the shell end wall (3) and forms a first circumferential protrusion on the outer surface of the shell end wall (3); and the first circumferential reinforcing rib (51) forms a second circumferential protrusion on the inner surface of the shell end wall (3); the axial height of the first circumferential protrusion is c1, and the axial height of the second circumferential protrusion is d1; c1 <d1; and / or, the second circumferential reinforcing rib (52) penetrates the shell end wall (3) and forms a third circumferential protrusion on the outer surface of the shell end wall (3); the second circumferential reinforcing rib (52) forms a fourth circumferential protrusion on the inner surface of the shell end wall (3); the axial height of the third circumferential protrusion is c2, and the axial height of the fourth circumferential protrusion is d2; c2 <d2; and / or, the third circumferential reinforcing rib (53) penetrates the shell end wall (3) and forms a fifth circumferential protrusion on the outer surface of the shell end wall (3); the third circumferential reinforcing rib (53) forms a sixth circumferential protrusion on the inner surface of the shell end wall (3); the circumferential height of the fifth circumferential protrusion is c3, and the axial height of the sixth circumferential protrusion is d3; c3 <d3。 8. The motor noise reduction structure according to claim 1, characterized in that: The first portion (32) is inclined toward the outside of the rotor housing (1) from the edge to the center.

9. The motor noise reduction structure according to claim 8, characterized in that: The tilt angle is 0.8° to 3°.

10. An outer rotor motor, comprising a motor noise reduction structure, characterized in that: The motor noise reduction structure is the motor noise reduction structure according to any one of claims 1 to 9.

11. A washing machine, comprising an outer rotor motor structure, characterized in that: The outer rotor motor is the outer rotor motor described in claim 10.

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