Motor rotor and motor having the same

Abstract

The utility model provides a kind of motor rotor and motor with it, motor rotor includes: rotating shaft, annular groove is equipped on rotating shaft;Rotor body, rotor body is set in annular groove, rotor body includes iron core assembly, permanent magnet assembly and injection molding structure, iron core assembly and permanent magnet assembly are all arranged around rotating shaft, injection molding structure is shaped at annular groove, injection molding structure is connected as a whole with rotating shaft, iron core assembly and permanent magnet assembly.The motor rotor of the utility model embodiment solves the technical problem of large motor resonance noise in the related art.

Description

Technical Field

[0001] This utility model relates to the field of motor design, and more specifically, to a motor rotor and a motor having the rotor. Background Technology

[0002] Noise performance is a crucial performance indicator for household appliances. Excessive noise from these appliances can not only cause irritability but also negatively impact health. Motor noise is a significant source of noise in household appliances. For example, in related technologies, the ripple torque pulsation at six times the electrical frequency of the outdoor unit motor of an air conditioner fan coupled with the rotor's torsional vibration mode can induce significant resonance noise. This resonance noise is prevalent in air conditioner outdoor units and severely affects auditory experience.

[0003] In related technologies, in order to improve the noise of the motor, the speed point where the motor resonance occurs is usually shielded. However, this does not solve the resonance problem and requires shielding a wide range of speeds, which has an adverse effect on the use of the motor.

[0004] It is evident that the relevant technologies suffer from significant motor resonance noise. Currently, no effective solution has been proposed to address this issue.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content

[0006] The main objective of this invention is to provide a motor rotor and a motor having the same rotor, in order to solve the technical problem of high motor resonance noise in related technologies.

[0007] To achieve the above objectives, according to one aspect of the present invention, a motor rotor is provided, comprising: a rotating shaft with an annular groove; a rotor body disposed in the annular groove, the rotor body comprising an iron core assembly, a permanent magnet assembly, and an injection-molded structure, the iron core assembly and the permanent magnet assembly being arranged around the rotating shaft, the injection-molded structure being formed at the annular groove, and the injection-molded structure connecting the rotating shaft, the iron core assembly, and the permanent magnet assembly into one unit.

[0008] Furthermore, along the axial direction of the shaft, the length of the annular groove is greater than or equal to the length of the rotor body.

[0009] Furthermore, along the axial direction of the shaft, the rotor body is located between the two end faces of the annular groove.

[0010] Furthermore, the motor rotor includes a first mounting position for mounting a first bearing and a second mounting position for mounting a second bearing, with an annular groove located between the first and second mounting positions.

[0011] Furthermore, the depth of the annular groove is greater than or equal to 0.1 mm.

[0012] Furthermore, the bottom of the annular groove is provided with a connecting reinforcement structure to increase the connection strength between the rotating shaft and the injection molding structure.

[0013] Furthermore, the connecting reinforcement structure includes a threaded structure, which is a recess or protrusion provided on the bottom surface of the annular groove, and the threaded structure extends axially along the shaft; and / or, the connecting reinforcement structure includes a knurled structure, which is a recess or protrusion provided on the bottom surface of the annular groove.

[0014] Furthermore, the core assembly includes multiple cores, which are arranged sequentially at intervals along the circumference of the shaft; the permanent magnet assembly includes multiple permanent magnets, with a permanent magnet provided between any two adjacent cores.

[0015] Furthermore, there is a gap between the iron core assembly and the bottom surface of the annular groove, and the injection molding structure fills the gap to fix the shaft and the iron core assembly together.

[0016] According to another aspect of the present invention, an electric motor is provided, comprising: a stator structure having a rotor mounting cavity; and a motor rotor, wherein the motor rotor is the aforementioned motor rotor and is mounted in the rotor mounting cavity.

[0017] The motor rotor employing this invention includes: a shaft with an annular groove; and a rotor body disposed within the annular groove. The rotor body comprises an iron core assembly, a permanent magnet assembly, and an injection-molded structure. Both the iron core assembly and the permanent magnet assembly are arranged around the shaft. The injection-molded structure is formed at the annular groove, connecting the shaft, iron core assembly, and permanent magnet assembly into a single unit. This motor rotor design, by designing an annular groove on the shaft and forming the injection-molded structure at the annular groove, fixes the iron core assembly and permanent magnet assembly to the shaft, connecting them into a single unit. By designing an annular groove on the shaft, more injection-molded material can be concentrated at the connection point during the injection molding process. Since the injection-molded material is a polymer, it has high damping capacity, which increases the overall damping performance of the rotor, suppresses resonance amplitude, and thus reduces motor rotor vibration and noise, solving the technical problem of excessive vibration and noise during motor operation in related technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is an exploded structural diagram of an embodiment of the motor rotor of this utility model;

[0020] Figure 2 This is a schematic diagram of the shaft structure of an embodiment of the motor rotor of this utility model;

[0021] Figure 3 for Figure 2 A magnified structural diagram of a local area in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of an embodiment of the motor rotor of this utility model;

[0023] Figure 5 This is a cross-sectional structural schematic diagram of an embodiment of the motor rotor of this utility model;

[0024] Figure 6 This is a cross-sectional structural schematic diagram of an embodiment of the motor rotor of this utility model;

[0025] Figure 7 This diagram illustrates the vibration of an electric motor (upper part of the figure) in related technologies and an embodiment of the electric motor of this utility model (lower part of the figure) under different operating conditions.

[0026] Figure 8 This diagram illustrates the noise levels of motors (marked by squares in the diagram) in related technologies and embodiments of the motor of this invention (marked by dots in the diagram) under different operating conditions.

[0027] The above figures include the following reference numerals:

[0028] 1. Shaft; 11. Annular groove; 111. Threaded structure; 112. Knurled structure; 2. Rotor body; 21. Iron core assembly; 211. Iron core; 22. Permanent magnet assembly; 221. Permanent magnet; 23. Injection molded structure; 3. First bearing; 4. Second bearing. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Please refer to Figures 1 to 8To address the technical problems described in the background section, this utility model provides a motor rotor, comprising: a rotating shaft 1 with an annular groove 11; and a rotor body 2 disposed within the annular groove 11. The rotor body 2 includes an iron core assembly 21, a permanent magnet assembly 22, and an injection-molded structure 23. The iron core assembly 21 and the permanent magnet assembly 22 are arranged around the rotating shaft 1. The injection-molded structure 23 is formed at the annular groove 11, connecting the rotating shaft 1, the iron core assembly 21, and the permanent magnet assembly 22 into a single unit. This motor rotor design, by designing an annular groove 11 on the rotating shaft 1 and forming the injection-molded structure 23 at the annular groove 11, fixes the iron core assembly 21 and the permanent magnet assembly 22 to the rotating shaft 1, thus connecting the three components into a single unit. By designing an annular groove 11 on the rotating shaft 1, more injection molding material can be concentrated at the connection part during the injection molding process to form the injection structure 23. Since the injection molding material is a polymer material, its damping ratio is relatively large, which can increase the overall damping performance of the rotor, suppress the resonance amplitude, thereby reducing the vibration and noise of the motor rotor and solving the technical problem of large vibration and noise during motor operation in related technologies.

[0031] In actual implementation, the injection-molded structure 23 can be made of a variety of materials, such as PBT, PA46, PA66, PP, epoxy resin, etc.

[0032] Specifically, along the axial direction of the shaft 1, the length of the annular groove 11 is greater than or equal to the length of the rotor body 2. Along the axial direction of the shaft 1, the rotor body 2 is located between the two end faces of the annular groove 11.

[0033] In this embodiment, the length of the annular groove 11 along the axial direction of the rotating shaft 1 is designed to be greater than or equal to the length of the rotor body 2. That is, the annular groove 11 is set through the rotor body 2 along the axial direction of the rotating shaft 1, thereby allowing more material to be injected into the annular groove 11 during injection molding, improving the rotor's damping performance. Actual verification has shown that this annular groove 11 structure, which penetrates the rotor body 2, can better suppress the rotor resonance amplitude and has a better control effect on vibration and noise.

[0034] Specifically, the motor rotor includes a first mounting position for mounting the first bearing 3 and a second mounting position for mounting the second bearing 4, with the annular groove 11 located between the first and second mounting positions.

[0035] It should be noted that the annular groove 11 is located between the first and second mounting positions, and can have different forms. For example, the length of the annular groove 11 may be less than the distance between the first and second mounting positions. In this case, after the first bearing 3 and the second bearing 4 are installed, the annular groove 11 is spaced apart from both the first bearing 3 and the second bearing 4. Alternatively, the length of the annular groove 11 may be equal to the distance between the first and second mounting positions. In this case, after the first bearing 3 and the second bearing 4 are installed, one end of the annular groove 11 is aligned with the end face of the first bearing 3 facing the second bearing 4, and the other end of the annular groove 11 is aligned with the end face of the second bearing 4 facing the first bearing 3.

[0036] In a preferred embodiment, the depth of the annular groove 11 is greater than or equal to 0.1 mm.

[0037] In this embodiment, since the annular groove 11 adopts a structural design that penetrates the rotor body 2 along the axial direction, it has a large dimension in the length direction. By controlling the depth of the annular groove 11 to be greater than or equal to 0.1 mm, sufficient space can be provided to accommodate the injection molding material. This allows the injection molding material to significantly increase the damping performance of the rotor and suppress the resonance amplitude after injection. In actual implementation, the lower limit of the depth of the annular groove 11 is 0.1 mm. As long as this depth is reached, the vibration and noise of the motor can be well controlled. When the depth of the annular groove 11 is too large, it will affect the rigidity of the shaft 1, which may lead to problems such as vibration and easy damage. Therefore, the upper limit of the annular groove 11 can be set according to the actual situation.

[0038] In this embodiment, the bottom of the annular groove 11 is provided with a connecting reinforcement structure to increase the connection strength between the rotating shaft 1 and the injection molding structure 23.

[0039] like Figures 1 to 3 As shown, by setting a connecting reinforcement structure at the bottom of the annular groove 11, and injection molding the injection structure 23 onto the connecting reinforcement structure, the connection strength between the rotating shaft 1 and the injection structure 23 can be improved, thereby improving the connection reliability between the rotating shaft 1, the iron core assembly 21, the permanent magnet assembly 22 and other structures, which is beneficial to the structural strength and vibration control of the motor.

[0040] Specifically, the connection reinforcement structure includes a threaded structure 111, which is a recess or protrusion provided on the bottom surface of the annular groove 11, and the threaded structure 111 extends along the axial direction of the rotating shaft 1; and / or, the connection reinforcement structure includes a knurled structure 112, which is a recess or protrusion provided on the bottom surface of the annular groove 11.

[0041] like Figures 1 to 3As shown, the threaded structure 111 is a structure arranged in a helical manner; specifically, it can be a raised structure or a recessed structure. By designing the threaded structure 111, after the injection-molded structure 23 is injection-molded, the injection-molded structure 23 and the rotating shaft 1 have a thread-like connection effect, increasing the axial connection strength between the two and preventing the rotor body 2 from sliding axially relative to the rotating shaft 1. By setting the knurled structure 112 at the bottom of the annular groove 11, the friction between the two is further increased, reducing the risk of relative rotation between them. When used in conjunction with the threaded structure 111, it can prevent the threaded structure from failing due to relative rotation between the two, ensuring the connection strength between them. In a specific embodiment, the knurled structure 112 includes multiple strip-shaped protrusions, each extending axially along the rotating shaft 1, and the multiple strip-shaped protrusions are arranged sequentially at intervals along the circumference of the rotating shaft 1. Of course, in other embodiments, the specific shape of the knurled structure 112 can also be other choices, such as several protrusions, several recesses, etc.

[0042] Specifically, the core assembly 21 includes multiple cores 211, which are arranged sequentially at intervals along the circumference of the rotating shaft 1; the permanent magnet assembly 22 includes multiple permanent magnets 221, with a permanent magnet 221 provided between any two adjacent cores 211. A gap exists between the core assembly 21 and the bottom surface of the annular groove 11, and the injection molding structure 23 fills the gap to fix the rotating shaft 1 and the core assembly 21 together.

[0043] It should be noted that in this embodiment, the core assembly 21 is not in direct contact with the rotating shaft 1. The inner diameter of the core assembly 21 is larger than the outer diameter of the rotating shaft 1, and the two are connected by the injection-molded structure 23. In related technologies, the core of an integral rotor is directly interference-fitted to the rotating shaft. Vibration is transmitted from the rotor to the rotating shaft and then to the housing. The entire vibration transmission path is made of steel, resulting in high vibration transmission rate, low damping, and almost no vibration attenuation effect. In this embodiment, the core assembly 21 is not in contact with the rotating shaft 1, but is connected by a polymer injection molding material. The polymer material can attenuate vibration in the vibration transmission path. In addition, when torsional vibration of the shaft occurs, the damping ratio of the polymer material is much higher than that of steel, which can also attenuate the resonance amplitude and reduce vibration and noise.

[0044] In addition, embodiments of this utility model also provide an electric motor, which includes: a stator structure having a rotor mounting cavity; and a motor rotor, which is the aforementioned motor rotor, and is mounted in the rotor mounting cavity.

[0045] like Figure 7 and Figure 8 As shown, Figure 7This diagram illustrates the vibration of a motor (upper half of the figure) in related technologies and an embodiment of the motor of this invention (lower half of the figure) under different operating conditions. Different colors in the figure represent different vibrations and noise levels; the warmer the color, the greater the vibration and noise. As seen in the figure, the red area in the middle corresponds to the point of greatest noise. It is evident that compared to the motor in related technologies, the width and brightness of the red area in the motor of this invention embodiment are reduced, indicating that vibration and noise are significantly suppressed. Figure 8 This diagram illustrates the noise levels of motors in related technologies (marked by squares in the diagram) and embodiments of the motor of this invention (marked by dots in the diagram) under different operating conditions. It can be seen that the motor with the above-described structural design in the embodiments of this invention exhibits lower noise levels at different speeds.

[0046] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0047] The motor rotor of this embodiment includes: a rotating shaft 1 with an annular groove 11; and a rotor body 2 disposed in the annular groove 11. The rotor body 2 includes an iron core assembly 21, a permanent magnet assembly 22, and an injection-molded structure 23. The iron core assembly 21 and the permanent magnet assembly 22 are arranged around the rotating shaft 1. The injection-molded structure 23 is formed at the annular groove 11, connecting the rotating shaft 1, the iron core assembly 21, and the permanent magnet assembly 22 into a single unit. With this structural design, the motor rotor, by designing the annular groove 11 on the rotating shaft 1 and forming the injection-molded structure 23 at the annular groove 11, fixes the iron core assembly 21 and the permanent magnet assembly 22 to the rotating shaft 1, thus connecting the three components into a single unit. By designing an annular groove 11 on the rotating shaft 1, more injection molding material can be concentrated at the connection part during the injection molding process to form the injection structure 23. Since the injection molding material is a polymer material, its damping ratio is relatively large, which can increase the overall damping performance of the rotor, suppress the resonance amplitude, thereby reducing the vibration and noise of the motor rotor and solving the technical problem of large vibration and noise during motor operation in related technologies.

[0048] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A motor rotor, characterized in that, include: A rotating shaft (1) is provided with an annular groove (11); The rotor body (2) is disposed in the annular groove (11). The rotor body (2) includes an iron core assembly (21), a permanent magnet assembly (22), and an injection molding structure (23). The iron core assembly (21) and the permanent magnet assembly (22) are arranged around the rotating shaft (1). The injection molding structure (23) is formed in the annular groove (11). The injection molding structure (23) connects the rotating shaft (1), the iron core assembly (21), and the permanent magnet assembly (22) into one unit.

2. The motor rotor according to claim 1, characterized in that, Along the axial direction of the rotating shaft (1), the length of the annular groove (11) is greater than or equal to the length of the rotor body (2).

3. The motor rotor according to claim 2, characterized in that, Along the axial direction of the shaft (1), the rotor body (2) is located between the two end faces of the annular groove (11).

4. The motor rotor according to claim 1, characterized in that, The motor rotor includes a first mounting position for mounting a first bearing (3) and a second mounting position for mounting a second bearing (4), and the annular groove (11) is located between the first mounting position and the second mounting position.

5. The motor rotor according to claim 1, characterized in that, The depth of the annular groove (11) is greater than or equal to 0.1 mm.

6. The motor rotor according to any one of claims 1 to 5, characterized in that, The bottom of the annular groove (11) is provided with a connecting reinforcement structure to increase the connection strength between the rotating shaft (1) and the injection molding structure (23).

7. The motor rotor according to claim 6, characterized in that, The connection reinforcement structure includes a threaded structure (111), which is a recess or protrusion disposed on the bottom surface of the annular groove (11), and the threaded structure (111) extends axially along the shaft (1); and / or, The connection reinforcement structure includes a knurled structure (112), which is a recess or protrusion provided on the bottom surface of the annular groove (11).

8. The motor rotor according to any one of claims 1 to 5, characterized in that, The core assembly (21) includes multiple cores (211), which are arranged sequentially at intervals along the circumference of the shaft (1); the permanent magnet assembly (22) includes multiple permanent magnets (221), and a permanent magnet (221) is provided between any two adjacent cores (211).

9. The motor rotor according to any one of claims 1 to 5, characterized in that, There is a gap between the core assembly (21) and the bottom surface of the annular groove (11), and the injection molding structure (23) fills the gap to fix the shaft (1) and the core assembly (21).

10. An electric motor, characterized in that, The motor includes: A stator structure having a rotor mounting cavity; The motor rotor is the motor rotor according to any one of claims 1 to 9, and the motor rotor is installed in the rotor mounting cavity.

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