Rotor assembly and motor

Abstract

The utility model discloses a rotor assembly which comprises a main body and an annular main body. The main body comprises a rotating shaft, an end ring, conducting bars and a rotor core, the rotating shaft is sleeved with the rotor core and the end ring, the end ring is located at the end of the rotor core, and the multiple conducting bars are arranged in the circumferential direction of the rotor core at intervals and inserted into the rotor core in the axial direction of the rotating shaft; and the guide strip is fixedly connected with the end ring. A balance block is arranged on the annular main body, and the annular main body is arranged on the rotating shaft in a sleeving mode and fixedly connected with the end ring. The rotor assembly and the motor at least can solve the problems that the centrifugal force of the end portion of the rotor is too large and the structure is not reliable.

Description

Technical Field

[0001] This utility model relates to the field of drive device technology, and more specifically, to a rotor assembly and a motor. Background Technology

[0002] The rotor, as one of the core components of an electric motor, has attracted much attention. To minimize the centrifugal force generated by the deformation of the rotor's end rings and guide bars (due to thermal expansion during operation), a stainless steel retaining ring (heated to increase the aperture before installation) is heat-fitted onto the outer circumference of the end ring to eliminate centrifugal force and enhance structural stability. Simultaneously, to eliminate the dynamic imbalance that occurs at the rotor end (the structure composed of the end rings, guide bars, and retaining ring) during hot operation (due to the shift in the center of gravity caused by thermal expansion at the rotor end), a balancing ring is installed on the rotor to adjust its dynamic balance. However, existing rotor retaining rings and balancing rings are generally separate components. This structure not only fails to effectively eliminate the centrifugal force generated during rotor rotation but is also unreliable and prone to damage during rotor operation. Utility Model Content

[0003] The main objective of this invention is to provide a rotor assembly and motor to at least solve the problems of excessive centrifugal force at the rotor end and unreliable structure.

[0004] According to one aspect of the present invention, a rotor assembly is provided, comprising:

[0005] The main body includes a rotating shaft, an end ring, guide bars, and a rotor core. The rotor core and the end ring are both sleeved on the rotating shaft, and the end ring is located at the end of the rotor core. Multiple guide bars are spaced apart along the circumference of the rotor core and inserted into the rotor core along the axial direction of the rotating shaft. The guide bars are fixedly connected to the end ring.

[0006] The ring-shaped body has a balance block on it, and the ring-shaped body is sleeved on the rotating shaft and fixedly connected to the end ring.

[0007] Furthermore, the annular body also includes a retaining ring portion, which is located on the side of the annular body near the end ring, and the retaining ring portion is sleeved on the outer periphery of the end ring and has a clearance fit with the end ring.

[0008] Furthermore, the rotor assembly also includes a plurality of locking members, which are evenly spaced along the circumference of the rotating shaft and are connected across the rotating shaft and the annular body.

[0009] Furthermore, the annular body includes a shaft hole, the axis of which coincides with the axis of the annular body, and the annular body is tightly fitted with the rotating shaft through the shaft hole.

[0010] Furthermore, the annular body also includes a connecting hole, and the rotor assembly also includes a connector. The connecting hole extends along the thickness direction of the annular body and penetrates the annular body. The connector passes through the connecting hole to fix the annular body to the end ring.

[0011] Furthermore, the connecting holes include a plurality of holes, and the connecting members include a plurality of connecting members. The plurality of connecting holes are evenly spaced along the circumferential direction of the annular body. The connecting members are arranged in a one-to-one correspondence with the connecting holes, and the connecting members pass through the connecting holes.

[0012] Furthermore, the annular body also includes an annular groove, the axis of which coincides with the axis of the rotating shaft, and the annular groove extends along the thickness direction of the annular body. The balance block is located in the annular groove and is fixedly connected to the annular body.

[0013] Furthermore, the annular groove includes a dovetail groove, the balance block includes a dovetail block, the dovetail groove is located on the side of the annular body away from the end ring, and the dovetail block is embedded in the dovetail groove and locked to the annular groove by a locking member.

[0014] Furthermore, the annular body also includes a plurality of ventilation holes, which are evenly spaced along the circumference of the annular body and extend along the thickness direction of the annular body and penetrate the annular body.

[0015] On the other hand, this application also mentions an electric motor that includes the rotor assembly described above.

[0016] In this invention, the rotor assembly includes an annular body sleeved on the rotating shaft and fixedly connected to the end ring. A balance block is provided on the annular body. This allows the rotor assembly of this application to at least solve the problems of excessive centrifugal force at the rotor's end and unreliable structure. During actual operation, the end ring and guide bars undergo thermal deformation and generate centrifugal force as they rotate with the shaft. Because the end ring is fixedly connected to the end of the guide bars, and the annular body is fixedly connected to the end ring, the centrifugal force generated after the deformation of the end ring and guide bars can be promptly transmitted to the rotating shaft through the annular body, thereby achieving the purpose of unloading the main body and making the overall structure of the rotor assembly of this application more reliable. Furthermore, because the annular body is equipped with a balance block, the balance block can adjust the dynamic balance of the rotor during rotation, improving or even eliminating the dynamic imbalance of the rotor assembly and greatly improving its reliability.

[0017] In other words, compared with existing rotors, the rotor assembly of this application can simultaneously eliminate the centrifugal force generated by the deformation of the end ring and guide bar and adjust the dynamic balance during the rotation of the rotor assembly through the annular body. It can also improve the structural stability of the rotor assembly to a certain extent. It is not only simple in structure, but also has a low manufacturing cost. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a cross-sectional view of the rotor assembly disclosed in an embodiment of the present utility model from a first perspective;

[0020] Figure 2 This is a cross-sectional view of the main body disclosed in an embodiment of the present utility model from a first-view perspective.

[0021] Figure 3 This is a partial cross-sectional view of the rotor assembly disclosed in an embodiment of the present utility model from a first perspective;

[0022] Figure 4 for Figure 3 Enlarged view of section A;

[0023] Figure 5 This is a cross-sectional view of the annular body and locking member disclosed in an embodiment of the present utility model from a second perspective;

[0024] Figure 6 This is a structural diagram of the annular body and locking component disclosed in an embodiment of the present utility model from a third-person perspective;

[0025] Figure 7 This is a structural diagram of the annular body and locking member disclosed in an embodiment of the present utility model from a fourth-angle perspective.

[0026] The above figures include the following reference numerals:

[0027] 10. Main body; 11. Rotating shaft; 12. End ring; 121. Annular notch; 13. Guide bar; 14. Rotor core; 20. Annular main body; 21. Balance block; 211. Dovetail block; 22. Protective ring; 23. Shaft hole; a. Axis of shaft hole; b. Axis of annular main body; 24. Connecting hole; 25. Annular groove; 251. Dovetail groove; c. Axis of annular groove; d. Axis of rotating shaft; 26. Ventilation hole; D. Predetermined gap; 30. Locking element; 40. Connecting element; x. Thickness direction; 50. Locking element; 60. Fan. Detailed Implementation

[0028] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] 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 the present invention. 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.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] As mentioned in the background section, in existing motor rotors, the end rings and guide bars are prone to deformation due to thermal expansion during operation. This deformation generates unnecessary centrifugal force, affecting not only the dynamic balance of the motor but also leading to unreliable end structures of the rotor. To eliminate this centrifugal force and enhance the structural stability of the end components (i.e., the structure composed of the end ring, guide bars, and retaining ring), retaining rings and balancing rings are installed on the rotor. However, existing retaining rings and balancing rings are separate components, and there is no direct contact between the retaining ring and the shaft. This prevents the centrifugal force generated by the deformation of the end rings and guide bars from being transmitted to the shaft in a timely manner, thus failing to unload the rotor (i.e., eliminate the centrifugal force generated by the deformation of the end rings and guide bars). Therefore, this application provides a rotor assembly that effectively solves the problems of excessive centrifugal force at the rotor ends and unreliable structure.

[0032] See Figures 1 to 7 As shown, according to an embodiment of this application, a rotor assembly is provided. The rotor assembly includes a main body 10 and an annular main body 20.

[0033] The main body 10 includes a rotating shaft 11, an end ring 12, guide bars 13, and a rotor core 14. Both the rotor core 14 and the end ring 12 are fitted onto the rotating shaft 11, with the end ring 12 located at the end of the rotor core 14. Multiple guide bars 13 are spaced circumferentially along the rotor core 14 and inserted into the rotor core 14 along the axial direction of the rotating shaft 11, with the guide bars 13 fixedly connected to the end ring 12. A balance block 21 is provided on the annular main body 20, which is fitted onto the rotating shaft 11 and fixedly connected to the end ring 12.

[0034] In this application, the rotor assembly includes an annular body 20 sleeved on the rotating shaft 11 and fixedly connected to the end ring 12. A balance block 21 is provided on the annular body 20. This allows the rotor assembly of this application to at least solve the problems of excessive centrifugal force at the rotor end and structural unreliability. During actual operation, the end ring 12 and guide bars 13 will deform due to heat during rotation with the rotating shaft 11, generating centrifugal force. Since the end ring 12 is fixedly connected to the end of the guide bar 13, and the annular body 20 is fixedly connected to the end ring 12, the centrifugal force generated after the deformation of the end ring 12 and guide bars 13 can be promptly transmitted to the rotating shaft 11 through the annular body 20, thereby achieving the purpose of unloading the body 10 and making the overall structure of the rotor assembly of this application more reliable. Furthermore, since the annular body 20 is provided with the balance block 21, during the rotation of the rotor assembly, the balance block 21 can adjust the dynamic balance of the rotor, improving or even eliminating the dynamic imbalance of the rotor assembly, greatly improving the reliability of the rotor assembly.

[0035] In other words, compared with existing rotors, the rotor assembly of this application can simultaneously eliminate the centrifugal force generated after the deformation of the end ring 12 and guide bar 13 and adjust the dynamic balance during the rotation of the rotor assembly through the annular body 20. It can also improve the structural stability of the rotor assembly to a certain extent. It is not only simple in structure, but also has a low manufacturing cost.

[0036] Further, see Figures 1 to 5 , Figure 7 As shown, the annular body 20 also includes a retaining ring portion 22, which is located on the side of the annular body 20 near the end ring 12, and the retaining ring portion 22 is sleeved on the outer periphery of the end ring 12 and is in clearance fit with the end ring 12.

[0037] Specifically, in this embodiment, the retaining ring portion 22 is along the thickness direction of the annular body 20 (i.e., Figure 5 The annular protrusion (in the direction indicated by x) (see...) Figure 5 and Figure 7As shown in the diagram, the retaining ring 22 is fitted around the outer circumference of the end ring 12 with a clearance fit. This arrangement has two advantages: First, it makes it easier for operators to fit the retaining ring 22 around the outer circumference of the end ring 12 when installing the annular body 20 onto the end ring 12. Second, when the end ring 12 expands due to heat during rotation (expanding and deforming along the radial direction of the end ring 12), the resulting centrifugal force can be promptly transmitted to the annular body 20 through the retaining ring 22, and then to the rotating shaft 11 through the annular body 20, thereby achieving the purpose of unloading the body 10. It should be noted that in actual manufacturing, the annular body 20 and the end ring 12 are made of materials with different coefficients of thermal expansion. Generally, the coefficient of expansion of the material used for the end ring 12 is greater than that of the material used for the annular body 20. Thus, during the rotation of the rotor assembly, the gap formed by the clearance fit between the retaining ring 22 and the outer circumference of the end ring 12 can be offset by the expansion deformation of the annular body 20 and the end ring 12. This gap can be offset because the coefficient of expansion of the material used for the end ring 12 is greater than that of the material used for the annular body 20. Therefore, when the annular body 20 and the end ring 12 expand and deform, the deformation of the end ring 12 is greater than the deformation of the retaining ring 22, thus offsetting the gap. This allows for a tight fit between the outer circumference of the retaining ring 22 and the end ring 12, facilitating unloading of the body 10.

[0038] Exemplarily, the retaining ring portion 22 can be directly fitted onto the outer periphery of the end ring 12, or an annular notch 121 can be provided at the end of the end ring 12 near the annular body 20. This embodiment shows the case where an annular notch 121 is provided at the end of the end ring 12 near the annular body 20 before the retaining ring portion 22 is fitted onto the outer periphery of the end ring 12. The annular notch 121 not only facilitates the installation between the annular body 20 and the end ring 12, but also reduces the radial dimension and overall weight of the rotor assembly to a certain extent, thereby reducing the moment of inertia of the rotor assembly to a certain extent, facilitating subsequent dynamic balancing adjustment of the rotor assembly by the operator, and increasing the smoothness of the rotor assembly's movement. Moreover, in this embodiment, a predetermined gap D is provided on the side of the retaining ring portion 22 near the end ring 12 along the thickness direction of the annular body 20, and D > 0. The advantage of this setting is that it ensures that the side of the annular body 20 near the end ring 12 can fit more closely with the end ring 12, thereby making the mating structure between the annular body 20 and the end ring 12 more stable, and thus enhancing the structural stability of the entire rotor assembly. If the guard ring portion 22 is not provided with a predetermined gap D (i.e., D = 0) on the side near the end ring 12, there will be a gap between the annular body 20 and the end ring 12, resulting in an unreliable fit between the annular body 20 and the end ring 12, which is prone to damage and also makes it difficult for the annular body 20 to unload the body 10. Therefore, in this embodiment, a predetermined gap D is provided on the side of the guard ring portion 22 near the end ring 12.

[0039] Further, see Figure 1 , Figure 3 as well as Figure 4 As shown, the rotor assembly also includes a plurality of locking elements 30, which are evenly spaced along the circumference of the rotating shaft 11 and are connected to the rotating shaft 11 and the annular body 20 by a seam.

[0040] Specifically, during the rotation of the rotor assembly, due to the influence of centrifugal force and dynamic balance, the annular body 20 is prone to sliding on the rotating shaft 11. The locking member 30 prevents the annular body 20 from moving on the rotating shaft 11 along the end away from the end ring 12, thereby ensuring the reliability of the connection between the annular body 20 and the end ring 12, and also enhancing the overall structural stability of the rotor assembly to a certain extent. In actual installation, a threaded hole can be machined at the joint between the annular body 20 and the rotating shaft 11, tilted towards the end ring 12. Then, the locking member 30 is installed into the threaded hole and tightened, thereby locking the position of the annular body 20 on the rotating shaft 11 and preventing the annular body 20 from sliding.

[0041] For example, there can be two, three, or more locking elements 30. This embodiment shows the case where there are four locking elements 30, and adjacent locking elements 30 are spaced 90° apart. In this application, multiple locking elements 30 are evenly spaced along the circumference of the rotating shaft 11. In this way, the influence of the locking elements 30 on the dynamic balance of the rotor assembly can be minimized, and the difficulty of adjusting the dynamic balance of the rotor assembly using the balance block 21 is also reduced.

[0042] Further, see Figure 1 , Figure 3 as well as Figure 4 As shown, the annular body 20 includes a shaft hole 23, the axis a of the shaft hole coincides with the axis b of the annular body, and the annular body 20 is tightly fitted with the rotating shaft 11 through the shaft hole 23.

[0043] Specifically, the axis a of the shaft hole coincides with the axis b of the annular body, thus ensuring the coaxiality of the shaft hole 23 and the annular body 20. This effectively guarantees the coaxiality of the shaft hole 23, the annular body 20, and the rotating shaft 11 after the annular body 20 is installed on the rotating shaft 11, preventing uneven mass distribution of the annular body 20 on the rotating shaft 11 from affecting the dynamic balance of the entire rotor assembly. Furthermore, to further ensure that the annular body 20 does not slip on the rotating shaft 11, and to ensure that the annular body 20 can effectively transfer and eliminate the centrifugal force generated by the deformation of the end ring 12 to the rotating shaft 11. The annular body 20 and the rotating shaft 11 are connected by an interference fit (i.e., the diameter of the shaft hole 23 is smaller than the diameter of the rotating shaft 11). Combined with the fixing of the locking element 30, this double fixing (the interference fit between the annular body 20 and the rotating shaft 11, and the locking of the annular body 20 by the locking element 30) ensures that after the annular body 20 is installed onto the rotating shaft 11 and the end ring 12, it will not slide in the axial direction of the rotating shaft 11, nor will it wobble in the radial direction. This ensures the structural stability of the rotor assembly and also improves the smoothness of the rotor assembly during rotation to a certain extent.

[0044] Further, see Figure 1 , Figures 3 to 7 As shown, the annular body 20 also includes a connecting hole 24, and the rotor assembly also includes a connector 40. The connecting hole 24 extends along the thickness direction x of the annular body 20 and penetrates the annular body 20. The connector 40 passes through the connecting hole 24 to fix the annular body 20 to the end ring 12.

[0045] Specifically, through the cooperation of the connecting hole 24 and the connector 40, the annular body 20 and the end ring 12 are firmly connected together to form an integral structure, which can enhance the stability of the rotor assembly during high-speed rotation, thereby preventing loosening between the annular body 20 and the end ring 12 or the annular body 20 from separating from the end ring 12. The connecting hole 24 penetrates along the thickness direction x of the annular body 20, and the connector 40 passes through the connecting hole 24 to fix the annular body 20 and the end ring 12. This provides a strong connection strength between the annular body 20 and the end ring 12, ensuring that the annular body 20 and the end ring 12 can withstand both large radial loads and a certain axial load. This ensures that the annular body 20 can effectively transfer the centrifugal force generated by the deformation of the end ring 12 to the rotating shaft 11 for elimination, while also ensuring that the rotor assembly maintains its integrity in the working environment and that the various structures do not separate.

[0046] Further, see Figure 1 , Figures 3 to 7 As shown, there are multiple connecting holes 24 and multiple connecting members 40. The multiple connecting holes 24 are evenly spaced along the circumferential direction of the annular body 20. The connecting members 40 are arranged in a one-to-one correspondence with the connecting holes 24, and the connecting members 40 pass through the connecting holes 24.

[0047] Specifically, multiple connecting holes 24 are evenly spaced along the circumferential direction of the annular body 20, allowing the connectors 40 to be evenly distributed on the annular body 20. This evenly distributed connection method helps to disperse and evenly distribute various loads (such as centrifugal force, torque, etc.) exerted on the rotor assembly by the annular body 20 and the connectors 40, reducing local stress concentration on the rotor assembly, thereby improving the overall structural strength and durability of the rotor assembly. Furthermore, the evenly distributed multiple connectors 40 firmly connect the annular body 20 to the end ring 12 through the connecting holes 24, further enhancing the overall stability of the rotor assembly. This helps to reduce vibration and deformation of the rotor assembly during high-speed rotation, ensuring the smoothness and reliability of motor operation. Simultaneously, the evenly spaced connecting holes 24 help ensure the coaxiality between the annular body 20 and the end ring 12, reducing dynamic imbalance problems in the rotor assembly caused by assembly errors. The design of multiple connection points increases the structural strength and rigidity of the rotor assembly, enabling it to withstand greater workloads and the influence of more complex external environments. Furthermore, the uniform distribution of the connecting holes 24 and the connectors 40 helps achieve mass balance and structural symmetry in the rotor assembly, which is crucial for reducing unbalanced vibration and noise during rotor assembly rotation. The evenly spaced connecting holes not only facilitate mass production and assembly of the annular body 20 but also contribute to improved production efficiency and product consistency. In this application, by adjusting the number and position of the connecting holes 24, the design requirements of rotor assemblies with different specifications and performance can be flexibly adapted, thereby enhancing the product's design flexibility and market adaptability to a certain extent.

[0048] For example, in this application, the connecting holes 24 can be two, three, or more than three, and the multiple connecting holes 24 are evenly spaced along the circumference of the annular body 20. This embodiment shows the case where there are eight connecting holes 24, and adjacent connecting holes 24 are spaced 45° apart. Correspondingly, there are also eight connectors 40, which are inserted into the connecting holes 24 one-to-one. This arrangement can ensure the fixed connection between the annular body 20 and the end ring 12, and also ensure that the contact surfaces of the annular body 20 and the end ring 12 can fit better.

[0049] Further, see Figures 3 to 6 As shown, the annular body 20 also includes an annular groove 25, the axis c of the annular groove coincides with the axis d of the rotating shaft, and the annular groove 25 extends along the thickness direction x of the annular body 20. The balance block 21 is located in the annular groove 25 and is fixedly connected to the annular body 20.

[0050] Specifically, the design of the annular groove 25 allows the balance block 21 to move or be fixed within the annular groove 25, thereby adjusting the mass distribution of the balance block 21 on the annular body 20 and thus adjusting the dynamic balance of the rotor assembly. By adding or removing the balance block 21, the dynamic imbalance of the rotor assembly caused by manufacturing errors or material inhomogeneity can be effectively eliminated, reducing the vibration and noise generated by the rotor assembly during operation. The annular groove 25 extends along the thickness direction x of the annular body 20, so that the balance block 21 can be embedded inside the annular body 20 without occupying additional axial space of the annular body 20. This compact structural design helps to reduce the overall size and weight of the rotor assembly, improving the space utilization and power density of the motor. The axis c of the annular groove coincides with the axis d of the shaft, ensuring the coaxiality of the annular groove 25 and the shaft 11, avoiding any impact on the mass distribution and dynamic balance of the annular body 20 on the shaft 11 due to the setting of the annular groove 25. This prevents eccentric vibration of the rotor assembly caused by dynamic imbalance. Furthermore, the fixed connection between the balance block 21 and the annular body 20 further enhances the stability of the rotor assembly during high-speed rotation, preventing the balance block 21 from loosening or separating from the annular body 20. Simultaneously, the design of the annular groove 25 facilitates the installation and adjustment of the balance block 21, making the assembly process simpler and faster. Moreover, during rotor assembly maintenance, if it is necessary to readjust the rotor balance, the balance block 21 within the annular groove 25 can be easily adjusted, thereby improving the convenience of maintenance.

[0051] Exemplary, the design of the annular groove 25 allows for flexible adjustment of the number, position, and weight of the balance blocks 21 according to specific needs, to adapt to the balancing requirements of different rotor assemblies. This embodiment shows the case where there are two balance blocks 21. Simultaneously, this modular design improves the adaptability and flexibility of the rotor assembly, facilitating adjustments and optimization of the production process. In this application, by precisely adjusting the weight of the balance blocks 21 and their position in the annular groove 25, the dynamic balancing accuracy of the rotor can be significantly improved, thereby enhancing the motor's operating efficiency and performance indicators. Reducing vibration and noise helps extend the service life of the rotor assembly and other critical components (such as bearings), lowering maintenance costs.

[0052] Further, see Figures 3 to 6 As shown, the annular groove 25 includes a dovetail groove 251, and the balance block 21 includes a dovetail block 211. The dovetail groove 251 is located on the side of the annular body 20 away from the end ring 12. The dovetail block 211 is embedded in the dovetail groove 251 and locked to the annular groove 25 by the locking member 50.

[0053] Specifically, the mating design of the dovetail groove 251 and the dovetail block 211 provides a strong mechanical connection, preventing the balance block 21 from sliding or dislodging along the thickness direction x of the annular body 20 within the annular groove 25. The use of the locking element 50 further ensures the fixed position of the dovetail block 211 in the dovetail groove 251, enhancing the stability of the rotor assembly during high-speed rotation. The precise fit between the dovetail groove 251 and the dovetail block 211 ensures the precise positioning of the balance block 21 within the annular body 20, contributing to improved assembly accuracy of the entire rotor assembly. This precise fit helps ensure coaxiality between the annular body 20 and the balance block 21, reducing rotor assembly imbalance caused by assembly errors. The design of the dovetail groove 251 and the dovetail block 211 facilitates the disassembly and installation of the balance block 21, making it easy to maintain and adjust the dynamic balance of the rotor assembly. Furthermore, the design of the dovetail groove 251 and the dovetail block 211 allows operators to flexibly adjust the number, position, and weight of the balance blocks 21 according to specific needs, adapting to the balance requirements of rotor assemblies of different specifications. Moreover, this design not only improves the balance and stability of the rotor assembly during operation, but also optimizes the assembly and maintenance process, while enhancing the product's adaptability and flexibility, thereby effectively improving the overall performance and service life of the rotor assembly.

[0054] Further, see Figures 3 to 7 As shown, the annular body 20 also includes a plurality of ventilation holes 26, which are evenly spaced along the circumference of the annular body 20 and extend along the thickness direction x of the annular body 20 and penetrate the annular body 20.

[0055] Specifically, multiple ventilation holes 26 are evenly spaced along the circumference of the annular body 20 and penetrate the annular body 20 along its thickness direction x. This design helps to form an effective airflow channel, promoting air circulation inside and outside the rotor assembly. This can significantly improve the heat dissipation efficiency of the rotor assembly, prevent performance degradation or damage to the rotor assembly due to overheating, and extend the service life of the motor. The arrangement of ventilation holes 26 reduces the material usage of the annular body 20, thereby reducing the overall weight of the rotor assembly. The lightweight design helps to improve the energy efficiency ratio of the motor, reduce the rotational inertia of the rotor assembly, and improve the dynamic response of the motor. Although the design of ventilation holes 26 reduces the material usage of the annular body 20, the evenly distributed multiple ventilation holes 26 help to maintain the overall structural strength of the annular body 20. Through reasonable layout and size design, the ventilation holes 26 can minimize the impact on the mechanical performance of the rotor assembly while ensuring heat dissipation. The evenly spaced multiple ventilation holes 26 along the circumference of the annular body 20 help to maintain the mass balance and structural symmetry of the rotor assembly, reducing unbalanced vibration and noise during rotor assembly rotation. Meanwhile, the design of the ventilation holes 26 facilitates the cleaning and maintenance of the rotor assembly's interior, preventing dust and debris accumulation from affecting motor performance. Furthermore, during maintenance, the internal condition of the rotor can be inspected through the ventilation holes 26, improving maintenance convenience. In addition, the evenly spaced ventilation holes 26 facilitate mass production and processing of the annular body 20, contributing to improved production efficiency and product consistency. Moreover, by adjusting the number, size, and position of the ventilation holes 26, different heat dissipation requirements and rotor assembly designs of varying specifications can be flexibly adapted, enhancing product design flexibility and market adaptability. In this application, the number of ventilation holes 26 can be two, three, or more. This embodiment shows a case with eight ventilation holes 26, and fans 60 are also provided near both ends of the rotating shaft 11. Through the combined action of the fans 60 and the ventilation holes 26, the heat dissipation efficiency of the rotor assembly can be greatly improved, thereby enhancing the motor's operating efficiency and performance.

[0056] Furthermore, this application also mentions an electric motor (not shown in the figure), which may be, for example, a squirrel-cage induction motor, a wound-rotor induction motor, a DC motor, or an induction motor, and the motor includes the aforementioned rotor assembly. Therefore, the motor includes all the technical effects of the aforementioned rotor assembly. Since the technical effects of the rotor assembly have been described in detail above, they will not be repeated here.

[0057] As can be seen from the above description, this application, by setting up a rotor assembly consisting of a main body 10, an annular main body 20, a locking member 30, a connecting member 40, a locking member 50, and a fan 60, and applying this rotor assembly to a motor, can at least solve the problems of excessive centrifugal force at the rotor end and unreliable structure. Specifically, the inner end face of the annular main body 20 (i.e., the surface on the retaining ring 22 that fits against the outer periphery of the end ring 12) and the outer periphery of the end ring 12 (in this embodiment, the surface of the annular notch 121 in the radial direction of the rotating shaft 11) are both machined flat surfaces, fitting together, and are axially connected and fastened together by the connecting member 40, eliminating the risk of separation (i.e., separation of the annular main body 20 and the end ring 12) under high-speed operation. Through the action of the retaining ring 22 and the connecting member 40, the centrifugal force generated after the deformation of the end ring 12 and the guide bar 13 can be promptly transmitted to the rotating shaft 11 through the annular main body 20, thereby achieving the purpose of unloading the main body 10. Furthermore, by providing a dovetail groove 251 on the annular body 20 and installing a dovetail block 211 locked in the dovetail groove 251 by a locking member 50, the dynamic stability of the rotor assembly during rotation is improved. Moreover, the interference fit between the shaft hole 23 of the annular body 20 and the rotating shaft 11, along with the double anti-loosening mechanism of the locking member 30, prevents the annular body 20 from detaching from the rotating shaft 11 and from swinging on the shaft. Simultaneously, the annular body 20 is provided with multiple ventilation holes 26, providing powerful axial ventilation. Combined with the fan 60 at both ends of the rotating shaft 11, this significantly improves the motor's heat dissipation efficiency and enhances its performance.

[0058] As can be seen, the rotor assembly of this application can eliminate the centrifugal force generated after the deformation of the end ring 12 and guide bar 13 by setting the annular body 20. At the same time, it can also adjust the dynamic balance of the rotor assembly during rotation. This not only improves the structural stability of the rotor assembly to a certain extent, but also has a simple structure and low manufacturing cost, which is conducive to saving costs and enhancing the reliability of the motor.

[0059] 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.

[0060] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0061] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, include: The main body (10) includes a rotating shaft (11), an end ring (12), guide bars (13), and a rotor core (14). The rotor core (14) and the end ring (12) are both sleeved on the rotating shaft (11), and the end ring (12) is located at the end of the rotor core (14). Multiple guide bars (13) are spaced apart along the circumference of the rotor core (14) and inserted into the rotor core (14) along the axial direction of the rotating shaft (11). The guide bars (13) are fixedly connected to the end ring (12). The annular body (20) is provided with a balance block (21), and the annular body (20) is sleeved on the rotating shaft (11) and fixedly connected to the end ring (12).

2. The rotor assembly according to claim 1, characterized in that, The annular body (20) also includes a retaining ring portion (22), which is located on the side of the annular body (20) near the end ring (12), and the retaining ring portion (22) is sleeved on the outer periphery of the end ring (12) and has a clearance fit with the end ring (12).

3. The rotor assembly according to claim 1, characterized in that, The rotor assembly also includes a plurality of locking elements (30), which are evenly spaced along the circumference of the rotating shaft (11) and are connected across the rotating shaft (11) and the annular body (20).

4. The rotor assembly according to claim 1, characterized in that, The annular body (20) includes a shaft hole (23), the axis (a) of the shaft hole coincides with the axis (b) of the annular body, and the annular body (20) is tightly fitted with the rotating shaft (11) through the shaft hole (23).

5. The rotor assembly according to claim 1, characterized in that, The annular body (20) further includes a connecting hole (24), and the rotor assembly further includes a connector (40). The connecting hole (24) extends along the thickness direction (x) of the annular body (20) and penetrates the annular body (20). The connector (40) passes through the connecting hole (24) to fix the annular body (20) and the end ring (12) together.

6. The rotor assembly according to claim 5, characterized in that, The connecting holes (24) include a plurality of holes, and the connecting members (40) include a plurality of connecting members. The plurality of connecting holes (24) are evenly spaced along the circumferential direction of the annular body (20). The connecting members (40) are provided in a one-to-one correspondence with the connecting holes (24), and the connecting members (40) pass through the connecting holes (24).

7. The rotor assembly according to claim 1, characterized in that, The annular body (20) also includes an annular groove (25), the axis (c) of the annular groove coincides with the axis (d) of the rotating shaft, and the annular groove (25) extends along the thickness direction (x) of the annular body (20). The balance block (21) is located in the annular groove (25) and is fixedly connected to the annular body (20).

8. The rotor assembly according to claim 7, characterized in that, The annular groove (25) includes a dovetail groove (251), and the balance block (21) includes a dovetail block (211). The dovetail groove (251) is located on the side of the annular body (20) away from the end ring (12). The dovetail block (211) is embedded in the dovetail groove (251) and locked in the annular groove (25) by a locking member (50).

9. The rotor assembly according to any one of claims 1 to 8, characterized in that, The annular body (20) also includes a plurality of ventilation holes (26), which are evenly spaced along the circumference of the annular body (20) and extend along the thickness direction (x) of the annular body (20) and penetrate the annular body (20).

10. An electric motor, characterized in that, The motor includes the rotor assembly according to any one of claims 1 to 9.

Images