Motor and air conditioner
By optimizing the connection between the shaft and the stop structure in the motor, the rigidity and structural strength are increased, thus solving the noise problem of DC motors in household appliances and achieving effective noise reduction and improved motor stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-27
AI Technical Summary
The noise problem caused by DC motors in household appliances has not been effectively solved.
Design a motor structure in which the first axial end of the shaft is connected by a first end cover and a stop structure. The radial dimension of the stop structure is small, which increases rigidity and structural strength. The second axial end of the shaft passes through a second opening. The end of the stator near the second opening has a larger load-bearing capacity. The overall structure is more stable and reduces vibration and noise.
By optimizing the motor structure, vibration and noise at the end of the stator closest to the first opening were reduced, improving the overall stability and noise control of the motor.
Smart Images
Figure CN224054020U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electric machines, and in particular to an electric machine and an air conditioner. BACKGROUND
[0002] Direct current motors are widely used in household appliances, such as refrigerators, air conditioners, etc. Since household appliances are located indoors, the noise problem of household appliances is widely concerned, and the noise generated by direct current motors as one of the noise sources of household appliances is also widely concerned. CONTENT
[0003] Therefore, the embodiments of the present application expect to provide an electric machine and an air conditioner, which can help to reduce the noise of the electric machine.
[0004] In a first aspect, the embodiments of the present application provide an electric machine, comprising:
[0005] a rotor;
[0006] a rotating shaft connected with the rotor;
[0007] a stator having a mounting cavity, a first opening and a second opening, the mounting cavity being in communication with the first opening and the second opening, the diameter of the first opening being larger than the diameter of the second opening, and the rotor being rotatably accommodated in the mounting cavity; one end of the stator close to the first opening is formed with a stop structure, and the diameter of the circumscribed circle of the stop structure is smaller than the outer diameter of the stator;
[0008] a first end cover covering the first opening and connected with the stop structure, the first end cover having an opening slot, the opening of the opening slot facing the mounting cavity, the end portion of the axial first end of the rotating shaft being accommodated in the opening slot, and the axial second end of the rotating shaft passing out of the mounting cavity through the second opening.
[0009] In some embodiments, the dimension of the stop structure along the axial direction of the rotating shaft is 7mm-12mm.
[0010] In some embodiments, the mounting cavity is of equal diameter in the direction close to the first opening along the axial direction.
[0011] In some embodiments, the slot wall of the opening slot is at least partially located in the mounting cavity.
[0012] In some embodiments, the first end cover is formed with an annular groove, the stop structure is annular, and the stop structure extends into the groove along the axial direction.
[0013] In some embodiments, the first end cover comprises a ring portion for axial stop fitting of the collar structure, and a remaining portion of the first end cover outside the ring portion does not exceed the ring portion in the direction axially away from the second opening.
[0014] In some embodiments, the motor comprises a first bearing, which is arranged in the opening groove, and the axial first end of the rotating shaft is connected with the first bearing.
[0015] In some embodiments, the motor comprises a second end cover, which covers the second opening, and the second end cover is provided with a shaft hole, and the axial second end of the rotating shaft passes through the shaft hole.
[0016] In some embodiments, the motor comprises a second bearing, and the second end cover has a containing groove in communication with the second opening, and the second bearing is arranged in the containing groove, and the rotating shaft is connected with the second bearing.
[0017] In a second aspect, an air conditioner is provided, which comprises the motor according to any of the embodiments.
[0018] The motor provided by the embodiments has the first end cover located at the axial first end of the rotating shaft, which serves to accommodate and support the end of the axial first end of the rotating shaft. When the motor is running, the radial dimension of the collar structure is relatively small, which helps to increase the rigidity and structural strength of the first end cover and the collar structure after being connected, so that the first end cover and the collar structure can better withstand the dynamic load of the axial first end of the rotating shaft, which helps to reduce the vibration of the end of the stator close to the first opening and helps to reduce the noise.
[0019] Moreover, since the diameter of the first opening is greater than the diameter of the second opening, the bearing capacity of the end of the stator close to the second opening is greater than the bearing capacity of the end of the stator close to the first opening. The axial second end of the rotating shaft is the output end of the motor, which is used to drive the external load to rotate, and the torque borne by the axial second end of the rotating shaft is greater than that borne by the axial first end of the rotating shaft. The axial second end of the rotating shaft passes out of the mounting cavity through the second opening, that is, the axial second end of the rotating shaft is closer to the end of the stator close to the second opening with greater bearing capacity, so that the overall structure of the motor is more stable, which helps to reduce the vibration of the motor and reduce the noise. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 FIG. 1 is a structural schematic diagram of a motor provided by an embodiment of the present application in a first perspective view;
[0021] Figure 2 FIG. 2 is a structural schematic diagram of the structure shown in FIG. 1 in a second perspective view; Figure 1
[0022] Figure 3 FIG. 3 is a structural schematic diagram of the structure shown in FIG. 2 in a third perspective view.Figure 1 Figure 2 is an exploded structural schematic diagram of the rotating shaft shown in Figure 1;
[0023] Figure 4 Figure 4 is a cross-sectional structural schematic diagram of the rotating shaft shown in Figure 1. Figure 1 Figure 4 is a cross-sectional structural schematic diagram of the rotating shaft shown in Figure 1.
[0024] Legend of Reference Signs
[0025] 1, motor; 10, rotating shaft; 20, stator; 21, mounting cavity; 22, first opening; 23, second opening; 24, stop structure; 30, first end cover; 31, opening groove; 32, recess; 321, ring part; 40, second end cover; 41, shaft hole; 42, accommodating groove. DETAILED DESCRIPTION
[0026] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.
[0027] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "radial", "axial" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0028] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0029] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0030] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.
[0031] The embodiments of the present application provide an electric machine 1, please refer to Figure 1 and Figure 2 , the electric machine 1 includes a rotor (not shown in the figure), a rotating shaft 10, a stator 20 and a first end cover 30.
[0032] The rotating shaft 10 is connected with the rotor. The rotating shaft 10 serves as the rotation center of the rotor, responsible for transmitting torque.
[0033] The stator 20 has a mounting cavity 21, a first opening 22 and a second opening 23, the mounting cavity 21 communicates the first opening 22 and the second opening 23, and the rotor is rotatably accommodated in the mounting cavity 21. That is, the first opening 22 and the second opening 23 are arranged at the two ends of the stator 20 along the axial direction of the rotor, and the mounting cavity 21 is used to accommodate the rotor. In this embodiment, the stator 20 serves as the appearance component of the electric machine 1.
[0034] In some embodiments, the diameter D3 of the first opening 22 is greater than the diameter D4 of the second opening 23. That is, D3 is greater than D4. In this way, the radial thickness of the cavity wall of the mounting cavity 21 near one end of the second opening 23 can be greater than the radial thickness of the cavity wall of the mounting cavity 21 near one end of the first opening 22, so that the bearing capacity of the stator 20 near one end of the second opening 23 is greater than the bearing capacity of the stator 20 near one end of the first opening 22.
[0035] In this embodiment, when the electric machine 1 is assembled, the rotor is loaded into the mounting cavity 21 from the first opening 22.
[0036] Exemplarily, the mounting cavity 21, the first opening 22 and the second opening 23 are coaxially arranged.
[0037] Exemplarily, as shown in Figure 3 , the end of the stator 20 near the first opening 22 is formed with a flange structure 24.
[0038] In some embodiments, please refer to Figure 4 , the diameter D2 of the circumscribed circle of the flange structure 24 is less than the outer diameter D1 of the stator 20. That is, D2 < D1.
[0039] It should be noted that the circumscribed circle of the stop structure 24 refers to a circle with the largest diameter that is tangent to the radially outer end surface of the projection of the stop structure 24 in the orthogonal projection in the plane perpendicular to the shaft 10.
[0040] The outer diameter of the stator 20 refers to the outer diameter of the circular ring portion of the projection of the stator 20 in the orthogonal projection in the plane perpendicular to the shaft 10.
[0041] In this embodiment, the projection of the stop structure 24 is located within the projection of the housing of the stator 20 in the orthogonal projection in the plane perpendicular to the shaft 10, that is, the radial dimension of the stop structure 24 is relatively small compared to the radial dimension of the stator 20.
[0042] Exemplarily, as shown in Figure 4 The first end cover 30 is connected with the stop structure 24 and covers the first opening 22. That is, the stator 20 is connected with the first end cover 30 through the stop structure 24.
[0043] In this embodiment, since the radial dimension of the stop structure 24 is relatively small and the first end cover 30 is used to connect with the stop structure 24, the radial dimension of the first end cover 30 is small, which helps to increase the rigidity and structural strength of the first end cover 30 and the stop structure 24 after being connected.
[0044] In addition, the connection of the first end cover 30 and the stop structure 24 also helps the miniaturization design of the first end cover 30. Since the first end cover 30 is connected with the stop structure 24, the part 20a of the stator 20 close to the first opening 22, which is located at the radially outer end of the stop structure 24, can be in contact with air, which helps to increase the heat dissipation area of the stator 20 close to the first opening 22 and improve the heat dissipation performance of the stator.
[0045] Exemplarily, the first end cover 30 has an open slot 31, and the opening of the open slot 31 faces the mounting cavity 21. The end of the axial first end of the shaft 10 is accommodated in the open slot 31, that is, the shaft 10 does not penetrate through the first end cover 30.
[0046] The axial second end of the shaft 10 penetrates out of the mounting cavity 21 through the second opening 23.
[0047] In this embodiment, the first end cover 30 is located at the axial first end of the shaft 10 and serves to accommodate and support the end of the axial first end of the shaft 10. When the motor 1 operates, since the radial dimension of the stop structure 24 is relatively small, it helps to increase the rigidity and structural strength of the first end cover 30 and the stop structure 24 after being connected, so that the first end cover 30 and the stop structure 24 can better withstand the dynamic load of the axial first end of the shaft 10, which helps to reduce the vibration of the end of the stator 20 close to the first opening 22 and helps to reduce the noise.
[0048] Moreover, the axial second end of the rotating shaft 10 serves as an output end of the motor 1 for driving an external load to rotate, and the torque borne by the axial second end of the rotating shaft 10 is greater than that borne by the axial first end of the rotating shaft 10. The axial second end of the rotating shaft 10 passes out of the mounting cavity 21 through the second opening 23, i.e., the axial second end of the rotating shaft 10 is closer to the end of the stator 20 closer to the second opening 23, which has a stronger bearing capacity, so that the overall structure of the motor 1 is more stable, which helps to reduce the vibration of the motor 1 and reduce the noise.
[0049] In some embodiments, the size d of the stop structure 24 along the axial direction of the rotating shaft 10 is 7 mm to 12 mm, i.e., 7 mm≤d≤12 mm, for example, d can be 7 mm, 8 mm, 8.5 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc. By controlling d within a reasonable range, the cantilever length of the stop structure 24 is limited within a reasonable range, so that the structural strength and rigidity of the stop structure 24 are higher, and when the first end cover 30 is connected with the stop structure 24, the stop structure 24 can better support the first end cover 30, thereby helping to reduce vibration and noise of the motor 1. At the same time, it is also convenient for assembly between the stop structure 24 and the first end cover 30.
[0050] For example, referring to Figure 4 , the mounting cavity 21 is set to be constant in diameter in the direction of approaching the first opening 22.
[0051] It should be noted that constant in diameter means that the diameter of the mounting cavity 21 at any position along the axial direction is the same, i.e., the cavity wall of the mounting cavity 21 is substantially cylindrical without steps.
[0052] In this way, on the one hand, the stop structure 24 is as close as possible to the rotating shaft 10 in the radial direction, which helps to further improve the radial rigidity of the end of the stator 20 closer to the first opening 22, and on the other hand, the coaxiality between the first end cover 30 and the inner circle of the stator 20 is higher, which helps to improve the assembly precision of the first end cover 30, and at the same time, it also helps to make the coaxiality between the opening groove 31 and the inner circle of the stator 20 higher, which helps to improve the coaxiality between the inner circle of the stator 20 and the rotating shaft 10, thereby helping to improve the uniformity of the air gap between the stator 20 and the rotor and reduce vibration, which helps to reduce noise.
[0053] For example, the motor 1 includes a first bearing, which is arranged in the opening groove 31 and connected with the axial first end of the rotating shaft 10. In this way, the first bearing provides radial and axial support for the axial first end of the rotating shaft 10, which helps to improve the stability of the rotating shaft 10 and the rotor during rotation.
[0054] In some embodiments, the slot wall of the open slot 31 is at least partially located in the mounting cavity 21. That is, at least a portion of the first bearing is located in the mounting cavity 21, which helps to reduce the axial dimension of the motor 1, thereby facilitating the miniaturization design of the motor 1.
[0055] In some embodiments, the first bearing is entirely located in the mounting cavity 21.
[0056] Exemplarily, the slot wall 31a of the open slot 31 at the end away from the second opening 23 is substantially flush with the end surface 24a of the shoulder structure 24 at the end away from the second opening 23. In this way, on the one hand, the first bearing is entirely located in the mounting cavity 21, so that the structure is compact, facilitating the reduction of the axial dimension of the motor 1 as much as possible, and on the other hand, the size of the open slot 31 penetrating into the mounting cavity 21 in the axial direction towards the second opening 23 is controlled, so that the open slot 31 does not interfere with the rotor in the mounting cavity 21.
[0057] In some embodiments, referring to Figure 3 , the first end cover 30 is formed with an annular groove 32, and the shoulder structure 24 is annular, and the shoulder structure 24 extends into the groove 32 in the axial direction. In this way, the shoulder structure 24 and the groove 32 are positioned and matched in the radial direction, which helps to improve the assembly stability between the shoulder structure 24 and the first end cover 30, thereby helping to reduce the vibration of the motor 1 during operation and to reduce the noise.
[0058] Exemplarily, referring to Figure 4 , the first end cover 30 includes a ring portion 321 for the axial stop cooperation of the shoulder structure 24. In this way, the axial positioning and cooperation of the first end cover 30 and the shoulder structure 24 are achieved.
[0059] In the embodiments in which the first end cover 30 is formed with the groove 32, the ring portion 321 is the slot wall of the groove 32 at the end away from the second opening 23.
[0060] Exemplarily, the remaining part of the first end cover 30 outside the ring portion 32 does not exceed the ring portion 32 in the axial direction away from the second opening 23. In this way, the axial dimension of the motor 1 is reduced. At the same time, it is also convenient for the remaining part of the first end cover 30 outside the ring portion 32 to be located in the mounting cavity 21, which helps to increase the contact area between the first end cover 30 and the cavity wall of the mounting cavity 21, thereby helping to improve the radial stiffness of the stator 20 at the end close to the first opening 22.
[0061] It should be noted that the remaining part of the first end cover 30 outside the ring portion 32 at least includes the open slot 31 and the structure connecting the open slot 31 and the ring portion 32.
[0062] In some embodiments, referring to Figure 1 and Figure 4The motor 1 comprises a second end cover 40, the second end cover 40 covers the second opening 23, the second end cover 40 is provided with a shaft hole 41, the axial second end of the rotating shaft 10 passes through the shaft hole 41. In this embodiment, the second end cover 40 is used to support the rotating shaft 10 and the rotating shaft 10 passes out of the second end cover 40, which facilitates the rotating shaft 10 to transfer torque outward.
[0063] In this embodiment, compared with the first end cover 30, the second end cover 40 is closer to the axial second end of the rotating shaft 10, that is, the second end cover 40 is closer to the external load, and the second end cover 40 needs to bear a larger load when the motor 1 operates. Since the diameter D3 of the first opening 22 is greater than the diameter D4 of the second opening 23, the radial dimension of the second end cover 40 is smaller than the radial dimension of the first end cover 30, so that the rigidity and structural strength of the second end cover 40 after being connected with the cavity wall of the mounting cavity 21 are greater than the rigidity and structural strength of the first end cover 30 after being connected with the stop structure 24, thereby facilitating the overall stability of the motor 1.
[0064] Exemplarily, the motor 1 comprises a second bearing, the second end cover 40 is provided with a containing groove 42 in communication with the second opening 23, the second bearing is arranged in the containing groove 42, and the rotating shaft 10 is connected with the second bearing. That is, the second bearing is sleeved on the rotating shaft 10 and is used to provide axial and radial support for the part of the rotating shaft 10 close to the second end.
[0065] Based on the motor 1 provided in the embodiments of the present application, the embodiments of the present application further provide an air conditioner, which comprises the motor 1 provided in any of the embodiments of the present application. That is, the motor 1 provided in the embodiments of the present application can be applied to an air conditioner.
[0066] The motor 1 can be applied to an outdoor unit of an air conditioner, as well as an indoor cabinet type air conditioner or an indoor hanging type air conditioner. When the motor 1 is applied to the indoor cabinet type air conditioner or the indoor hanging type air conditioner, the noise of the motor 1 will affect the rest of the user, especially when the air conditioner works at night, the user is particularly sensitive to noise, and therefore the noise control of the motor 1 is particularly important. The motor 1 provided in the embodiments of the present application is helpful to reduce the noise in the operation process of the motor 1 and is suitable for use in an air conditioner.
[0067] The various embodiments / implementation manners provided in the present application can be combined with each other without contradiction.
[0068] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An electric machine characterized in that, The motor comprises: a rotor; a rotating shaft connected with the rotor; a stator having a mounting cavity, a first opening and a second opening, the mounting cavity being in communication with the first opening and the second opening, the first opening having a larger diameter than the second opening, the rotor being rotatably accommodated in the mounting cavity; an end of the stator close to the first opening being formed with a stop structure, the stop structure having an inscribed circle with a diameter smaller than an outer diameter of the stator; a first end cover covering the first opening and connected with the stop structure, the first end cover having an opening slot, the opening slot having an opening facing the mounting cavity, an end portion of an axial first end of the rotating shaft being accommodated in the opening slot, an axial second end of the rotating shaft passing out of the mounting cavity through the second opening.
2. The electric machine of claim 1, wherein, The stop structure has an axial dimension of 7mm-12mm.
3. The electric machine of claim 1, wherein, The mounting cavity is of a constant diameter in the direction close to the first opening.
4. The electric machine of claim 1, wherein, A slot wall of the opening slot is at least partially located in the mounting cavity.
5. The electric machine of claim 1, wherein, The first end cover is formed with an annular groove, the stop structure is annular, and the stop structure extends into the groove in the axial direction.
6. The electric machine of claim 1, wherein, The first end cover comprises a ring portion for axial stop cooperation with the stop structure, and a remaining portion of the first end cover outside the ring portion is not more than the ring portion in the direction away from the second opening in the axial direction.
7. The electric machine of claim 1, wherein, The motor comprises a first bearing, the first bearing being located in the opening slot, and an axial first end of the rotating shaft being connected with the first bearing.
8. The electric machine of claim 1, wherein, The motor comprises a second end cover covering the second opening, the second end cover being provided with a shaft hole, and an axial second end of the rotating shaft passing through the shaft hole.
9. The electric machine of claim 8, wherein, The motor comprises a second bearing, the second end cover having an accommodation slot in communication with the second opening, the second bearing being located in the accommodation slot, and the rotating shaft being connected with the second bearing.
10. An air conditioner characterized by comprising: The motor comprises the motor as claimed in any one of claims 1-9. The motor comprises the motor as claimed in any one of claims 1-9.