A rotor assembly and electric machine
Patent Information
- Application Number
- CN202522519617.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-10-13
- Estimated Expiration
- 2035-11-27
AI Technical Summary
然而，这种技术方案存在缺陷：当转子在高速且长时间运转时，由于离心力、振动及热应力等综合作用，配重件可能发生松动甚至脱落
[0022]本实用新型提供的转子总成，铁芯组包括间隔设于转子轴上的第一铁芯和第二铁芯，压套固定套设于转子轴上且位于第一铁芯与第二铁芯之间。压套轴向方向上的端面开设有多个配重孔，多个配重孔沿压套周向间隔分布，每个配重孔均能够插入配重件。当进行完转子动平衡后，可根据动平衡结果选择在目标位置的配重孔插入配重件，进而减小不平衡量。配重件插入至压套后，再安装第一铁芯与第二铁芯后，压套第一端与第一铁芯贴合，压套第二端与第二铁芯贴合，通过第一铁芯与第二铁芯，能够对压套轴向方向的两个端面进行贴合，进而实现对配重孔的封堵，避免配重件后续再意外掉落，确保配重安装可靠稳定。
Smart Images
Figure CN224852170U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a rotor assembly and a motor. Background Technology
[0002] In the field of motor technology, with the ever-increasing demands on equipment performance from industrial applications, optimizing motor speed has become a key research direction. However, significant increases in speed are often accompanied by intensified vibration and noise, which not only affects the stability of equipment operation but may also shorten equipment lifespan. Against this backdrop, the control of motor imbalance accuracy is particularly important, as it directly relates to the rotor's dynamic balance performance. Therefore, how to achieve efficient rotor dynamic balancing under high-speed conditions has become a pressing technical challenge in motor design and manufacturing.
[0003] In existing technologies, a common method to achieve precise adjustment of rotor dynamic balance is to drill holes at both ends of the rotor assembly core and insert counterweights or counterweight pins. However, this approach has drawbacks: when the rotor operates at high speed for extended periods, the counterweights may loosen or even fall off due to the combined effects of centrifugal force, vibration, and thermal stress. If the counterweights detach from their preset positions and enter the air gap between the stator and rotor, it will cause serious mechanical interference, potentially leading to unstable motor operation, reduced efficiency, or even equipment failure, thus posing a potential threat to the reliability and safety of the motor system. Utility Model Content
[0004] The purpose of this invention is to provide a rotor assembly that can be fitted with counterweights to reduce the initial imbalance and effectively prevent the counterweights from falling off accidentally, ensuring that the counterweight installation is reliable and stable.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] A rotor assembly, comprising:
[0007] Rotor shaft;
[0008] The core assembly includes a first core and a second core, both of which are fixedly sleeved on the rotor shaft, and the first core and the second core are spaced apart.
[0009] A pressure sleeve is fixedly sleeved on the rotor shaft and located between the first iron core and the second iron core. The first end of the pressure sleeve is in contact with the first iron core, and the second end of the pressure sleeve is in contact with the second iron core. The end face of the pressure sleeve in the axial direction is provided with a plurality of counterweight holes, which are distributed at intervals along the circumference of the pressure sleeve. Each counterweight hole can accommodate a counterweight.
[0010] Preferably, the counterweight hole is located at the first end of the pressure sleeve, and the first iron core blocks the counterweight hole; and / or,
[0011] The counterweight hole is located at the second end of the pressure sleeve, and the second iron core blocks the counterweight hole.
[0012] Preferably, the counterweight hole extends from the first end to the second end along the axial direction of the pressure sleeve, the first iron core blocks the first end of the counterweight hole, and the second iron core blocks the second end of the counterweight hole.
[0013] Preferably, the counterweight and the counterweight hole are configured to have an interference fit.
[0014] Preferably, the counterweight is configured as a counterweight pin, and the end face and side face of the counterweight pin are provided with a chamfer or rounded corner.
[0015] Preferably, the pressure sleeve includes an inner ring, an outer ring, and a plurality of support bars connecting the inner ring and the outer ring. The inner ring and the outer ring are arranged with their axes coincident. The plurality of support bars are arranged axially spaced around the inner ring. The inner ring is fixedly sleeved on the rotor shaft. The plurality of counterweight holes are all opened on the side end face of the outer ring.
[0016] Preferably, the inner ring, the outer ring, and the support strip are integrally formed.
[0017] Preferably, the diameters of the first iron core, the second iron core, and the outer ring are set to be equal.
[0018] Preferably, the assembly further includes a first pressure plate and a second pressure plate, with the iron core disposed between the first pressure plate and the second pressure plate. The first pressure plate is fixedly sleeved on the rotor shaft and presses against the end face of the first iron core facing away from the pressure sleeve. The second pressure plate is fixedly sleeved on the rotor shaft and presses against the end face of the second iron core facing away from the pressure sleeve.
[0019] This utility model also provides a motor, including the rotor assembly described above, which can be equipped with counterweights to reduce the initial imbalance and effectively prevent the counterweights from falling off accidentally, ensuring reliable and stable counterweight installation and guaranteeing stable motor operation.
[0020] An electric motor includes a rotor assembly as described in any of the preceding claims, and further includes a housing and a stator, wherein the stator and the rotor assembly are both disposed within the housing.
[0021] Beneficial effects:
[0022] The rotor assembly provided by this utility model includes a first iron core and a second iron core spaced apart on the rotor shaft. A pressure sleeve is fixedly sleeved on the rotor shaft and located between the first and second iron cores. Multiple counterweight holes are formed on the axial end face of the pressure sleeve, spaced apart circumferentially. Each counterweight hole can accommodate a counterweight. After rotor dynamic balancing, a counterweight can be inserted into the target hole based on the dynamic balancing results, thereby reducing the imbalance. After the counterweight is inserted into the pressure sleeve, and then the first and second iron cores are installed, the first end of the pressure sleeve is in contact with the first iron core, and the second end of the pressure sleeve is in contact with the second iron core. The first and second iron cores together seal the two axial end faces of the pressure sleeve, thus blocking the counterweight holes and preventing accidental fall-off of the counterweight, ensuring reliable and stable counterweight installation.
[0023] The motor provided by this utility model includes the aforementioned rotor assembly, which can be equipped with counterweights to reduce the initial imbalance and effectively prevent the counterweights from falling off accidentally, ensuring reliable and stable counterweight installation and guaranteeing stable motor operation. Attached Figure Description
[0024] Figure 1 A schematic diagram of the rotor assembly provided by this utility model;
[0025] Figure 2 A schematic diagram of the structure for the fit between the pressure sleeve and the counterweight provided by this utility model;
[0026] Figure 3 A schematic diagram of the structure of the pressure sleeve provided by this utility model;
[0027] Figure 4 A schematic diagram of the counterweight provided by this utility model.
[0028] In the picture:
[0029] 1. Rotor shaft;
[0030] 21. First iron core; 22. Second iron core;
[0031] 3. Pressure sleeve; 31. Inner ring; 32. Outer ring; 321. Counterweight hole; 33. Support bar;
[0032] 4. Counterweights;
[0033] 51. First pressure plate; 52. Second pressure plate. Detailed Implementation
[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0038] This embodiment provides a rotor assembly. (Refer to...) Figures 1 to 4As shown, the rotor assembly includes a rotor shaft 1, a core assembly, and a pressure sleeve 3. The core assembly includes a first core 21 and a second core 22, both fixedly sleeved on the rotor shaft 1, with the first core 21 and the second core 22 spaced apart. The pressure sleeve 3 is fixedly sleeved on the rotor shaft 1 and located between the first core 21 and the second core 22. The first end of the pressure sleeve 3 is in contact with the first core 21, and the second end of the pressure sleeve 3 is in contact with the second core 22. Multiple counterweight holes 321 are provided on the axial end face of the pressure sleeve 3, spaced apart circumferentially along the pressure sleeve 3. Each counterweight hole 321 can accommodate a counterweight 4.
[0039] In this embodiment, the core assembly includes a first core 21 and a second core 22 spaced apart on the rotor shaft 1. A pressure sleeve 3 is fixedly sleeved on the rotor shaft 1 and located between the first core 21 and the second core 22. The end face of the pressure sleeve 3 in the axial direction has multiple counterweight holes 321, which are spaced apart circumferentially along the pressure sleeve 3. Each counterweight hole 321 can accommodate a counterweight 4. After the rotor dynamic balancing is completed, a counterweight 4 can be inserted into a counterweight hole 321 at a target position based on the dynamic balancing results, thereby reducing the imbalance. After the counterweight 4 is inserted into the pressure sleeve 3, and then the first iron core 21 and the second iron core 22 are installed, the first end of the pressure sleeve 3 is in contact with the first iron core 21, and the second end of the pressure sleeve 3 is in contact with the second iron core 22. Through the first iron core 21 and the second iron core 22, the two end faces of the pressure sleeve 3 in the axial direction can be in contact, thereby sealing the counterweight hole 321, preventing the counterweight 4 from falling off accidentally in the future, and ensuring that the counterweight installation is reliable and stable.
[0040] In some optional embodiments, the counterweight hole 321 is formed at the first end of the pressure sleeve 3, and the first iron core 21 blocks the counterweight hole 321; and / or, the counterweight hole 321 is formed at the second end of the pressure sleeve 3, and the second iron core 22 blocks the counterweight hole 321. Specifically, in this embodiment, the counterweight hole 321 is formed at the first end and / or the second end of the pressure sleeve 3 in the axial direction, and it is not configured as a through hole. When the counterweight hole 321 is formed at the first end of the pressure sleeve 3, after the counterweight 4 is inserted, the opening of the counterweight hole 321 is blocked by the first iron core 21 to prevent the counterweight 4 from falling out of the counterweight hole 321; when the counterweight hole 321 is formed at the second end of the pressure sleeve 3, after the counterweight 4 is inserted, the opening of the counterweight hole 321 is blocked by the second iron core 22 to prevent the counterweight 4 from falling out of the counterweight hole 321.
[0041] In some optional embodiments, the counterweight hole 321 extends from the first end to the second end along the axial direction of the pressure sleeve 3. The first iron core 21 blocks the first end of the counterweight hole 321, and the second iron core 22 blocks the second end of the counterweight hole 321. Specifically, in this embodiment, the counterweight hole 321 is configured as a through hole. After the counterweight 4 is inserted into the counterweight hole 321, the first iron core 21 and the second iron core 22 respectively block the openings at both ends of the counterweight hole 321, thereby preventing the counterweight 4 from falling out of the counterweight hole 321.
[0042] In this embodiment, the counterweight 4 and the counterweight hole 321 are configured with an interference fit. This configuration ensures that the counterweight 4 remains relatively fixed to the counterweight hole 321 after being inserted into it, preventing the counterweight hole 321 from moving freely.
[0043] In this embodiment, the counterweight 4 is configured as a counterweight pin, with a chamfer or rounded corner between its end face and side face. Specifically, the chamfer or rounded corner on the counterweight pin serves as an effective insertion guide, facilitating the smooth insertion of the counterweight pin into the counterweight hole 321. Besides being configured as a counterweight pin, the counterweight 4 can also be configured as a counterweight block or other specific components.
[0044] In this embodiment, the pressure sleeve 3 includes an inner ring 31, an outer ring 32, and a plurality of support bars 33 connecting the inner ring 31 and the outer ring 32. The axes of the inner ring 31 and the outer ring 32 coincide, and the plurality of support bars 33 are spaced apart axially around the inner ring 31. The inner ring 31 is fixedly sleeved on the rotor shaft 1, and a plurality of counterweight holes 321 are all opened on the side end face of the outer ring 32. Specifically, the plurality of counterweight holes 321 are evenly spaced on the side end face of the outer ring 32 around the axial direction of the pressure sleeve 3. The plurality of support bars 33 are evenly spaced around the axial direction of the inner ring 31.
[0045] In this embodiment, the inner ring 31, outer ring 32, and support bar 33 are integrally formed, that is, the pressure sleeve 3 is integrally formed, which eliminates the need for multiple processing or assembly processes. It can be completed in one injection molding / die casting / forging process through a mold, which greatly reduces the production process and reduces labor costs and equipment investment. In addition, the integral molding avoids the cumulative tolerance caused by the assembly of multiple parts. With the help of high-precision molds, the consistency of part dimensions can be guaranteed (the tolerance can be controlled within ±0.05mm), ensuring accuracy.
[0046] In this embodiment, the diameters of the first iron core 21, the second iron core 22, and the outer ring 32 are set to be equal. Setting the same diameter ensures that the center of gravity of the rotor assembly will not shift, thereby maintaining high-precision dynamic balance performance and effectively reducing vibration and noise.
[0047] In this embodiment, the rotor assembly further includes a first pressure plate 51 and a second pressure plate 52. The iron core assembly is disposed between the first pressure plate 51 and the second pressure plate 52. The first pressure plate 51 is fixedly sleeved on the rotor shaft 1 and presses against the end face of the first iron core 21 facing away from the pressure sleeve 3. The second pressure plate 52 is fixedly sleeved on the rotor shaft 1 and presses against the end face of the second iron core 22 facing away from the pressure sleeve 3. By setting the first pressure plate 51 and the second pressure plate 52, a uniform clamping force is applied, enhancing the reliability of the connection between the first iron core 21, the second iron core 22, the pressure sleeve 3, and the rotor shaft 1. This prevents axial displacement or loosening of the first iron core 21, the second iron core 22, and the pressure sleeve 3 during operation, achieving effective limiting. Furthermore, by uniformly pressing the first iron core 21 and the second iron core 22 with the first pressure plate 51 and the second pressure plate 52, it can be ensured that the center of gravity of the rotor assembly will not shift, thereby maintaining high-precision dynamic balance performance and reducing vibration and noise during high-speed rotation.
[0048] Optionally, the first pressure plate 51 can be fixedly connected to the first iron core 21 by bolts or other connecting parts, and the second pressure plate 52 can be fixedly connected to the second iron core 22 by bolts or other connecting parts.
[0049] This embodiment also provides a motor, which includes the rotor assembly described above, as well as a housing and a stator, both of which are housed within the housing. Specifically, the motor includes the rotor assembly described above, and a counterweight 4 can be installed to reduce the initial imbalance and effectively prevent the counterweight 4 from accidentally falling off, ensuring reliable and stable counterweight installation and guaranteeing stable motor operation.
[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A rotor assembly, characterized in that, include: Rotor shaft (1); The core assembly includes a first core (21) and a second core (22). The first core (21) and the second core (22) are both fixedly sleeved on the rotor shaft (1), and the first core (21) and the second core (22) are spaced apart. A pressure sleeve (3) is fixedly sleeved on the rotor shaft (1) and located between the first iron core (21) and the second iron core (22). The first end of the pressure sleeve (3) is in contact with the first iron core (21), and the second end of the pressure sleeve (3) is in contact with the second iron core (22). The end face of the pressure sleeve (3) in the axial direction is provided with a plurality of counterweight holes (321). The plurality of counterweight holes (321) are distributed at intervals along the circumference of the pressure sleeve (3). Each counterweight hole (321) can accommodate a counterweight (4).
2. The rotor assembly according to claim 1, characterized in that, The counterweight hole (321) is located at the first end of the pressure sleeve (3), and the first iron core (21) blocks the counterweight hole (321); and / or, The counterweight hole (321) is opened at the second end of the pressure sleeve (3), and the second iron core (22) blocks the counterweight hole (321).
3. The rotor assembly according to claim 1, characterized in that, The counterweight hole (321) extends from the first end to the second end along the axial direction of the pressure sleeve (3). The first iron core (21) blocks the first end of the counterweight hole (321), and the second iron core (22) blocks the second end of the counterweight hole (321).
4. The rotor assembly according to claim 1, characterized in that, The counterweight (4) and the counterweight hole (321) are configured to be interference fit.
5. The rotor assembly according to claim 1, characterized in that, The counterweight (4) is configured as a counterweight pin, and the end face and side face of the counterweight pin are provided with a chamfer or rounded corner.
6. The rotor assembly according to claim 1, characterized in that, The pressure sleeve (3) includes an inner ring (31), an outer ring (32), and a plurality of support bars (33) connecting the inner ring (31) and the outer ring (32). The inner ring (31) and the outer ring (32) are arranged with their axes coincident. The plurality of support bars (33) are arranged axially spaced around the inner ring (31). The inner ring (31) is fixedly sleeved on the rotor shaft (1). The plurality of counterweight holes (321) are all opened on the side end face of the outer ring (32).
7. The rotor assembly according to claim 6, characterized in that, The inner ring (31), the outer ring (32), and the support strip (33) are integrally formed.
8. The rotor assembly according to claim 6, characterized in that, The diameters of the first iron core (21), the second iron core (22), and the outer ring (32) are set to be equal.
9. The rotor assembly according to claim 1, characterized in that, It also includes a first pressure plate (51) and a second pressure plate (52). The iron core assembly is disposed between the first pressure plate (51) and the second pressure plate (52). The first pressure plate (51) is fixedly sleeved on the rotor shaft (1) and presses against the end face of the first iron core (21) facing away from the pressure sleeve (3). The second pressure plate (52) is fixedly sleeved on the rotor shaft (1) and presses against the end face of the second iron core (22) facing away from the pressure sleeve (3).
10. An electric motor, characterized in that, The rotor assembly includes any one of claims 1-9, and further includes a housing and a stator, wherein both the stator and the rotor assembly are disposed within the housing.