High speed motor rotor structure

Abstract

The utility model discloses a high -speed motor rotor structure, including the pivot and the rotor iron core of being sleeved on the pivot, still include a annular tolerance compensation ring and be used for to the axial location structure of tolerance compensation ring axial location, tolerance compensation ring set between pivot with rotor iron core, and make from elastic material, at least one concave -convex cooperation structure in its inner circumferential surface and outer circumferential surface is provided, is used to compensate the assembly tolerance between pivot with rotor iron core when the elastic deformation of being under pressure, axial location structure includes respectively setting in the balance ring of rotor iron core both ends, balance ring fixedly sleeved on the pivot, the utility model has the advantages of stable structure, strong anti -centrifugal force, can automatic compensation thermal deformation and assembly tolerance.

Description

Technical Field

[0001] This utility model relates to the technical field of high-speed motor rotor structure, specifically a high-speed motor rotor structure. Background Technology

[0002] In the field of motor technology, the connection structure between the shaft and the rotor core has a crucial impact on the motor's operating performance, reliability, and service life. Traditional high-speed motor rotors typically use a transition fit with a key connection between the shaft and the rotor core, or an interference fit assembled by cold pressing with a hydraulic press. These methods can meet basic usage requirements under normal operating conditions.

[0003] However, as motor speed increases, the centrifugal force on the rotor system increases significantly, and the increased rotor temperature leads to thermal expansion of the materials. Under these conditions, traditional transition fit keyed connections are prone to gaps, causing relative sliding in the circumferential direction between the shaft and the rotor core. This not only causes abnormal noise but also affects the motor's structural strength and NVH (noise, vibration, and harshness) performance. If the interference fit is further increased to enhance connection reliability, the rotor core will bear excessive assembly stress, causing core deformation. In severe cases, this can lead to stator rubbing between the stator and rotor, endangering the safe operation of the motor.

[0004] Therefore, the existing technology lacks a rotor connection structure that can effectively compensate for the dimensional tolerances between the shaft and the rotor core under high-speed and high-temperature conditions, as well as prevent circumferential slippage and avoid core deformation. There is an urgent need to propose a high-speed motor rotor structure to solve the above-mentioned technical contradictions and improve the operational stability and reliability of high-speed motors. Utility Model Content

[0005] The purpose of this invention is to provide a high-speed motor rotor structure that has the advantages of structural stability, strong resistance to centrifugal force, and automatic compensation for thermal deformation and assembly tolerances, thus solving the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-speed motor rotor structure includes a rotating shaft and a rotor core mounted on the rotating shaft, and further includes an annular tolerance compensation ring and an axial limiting structure for axially limiting the tolerance compensation ring; the tolerance compensation ring is disposed between the rotating shaft and the rotor core and is made of an elastic material, and at least one concave-convex fitting structure is provided on its inner circumferential surface and outer circumferential surface for elastic deformation under pressure to compensate for the assembly tolerance between the rotating shaft and the rotor core.

[0007] Preferably, the axial limiting structure includes balance rings respectively disposed at both ends of the rotor core, and the balance rings are fixedly fitted onto the rotating shaft.

[0008] It is worth noting that this structure uses a balance ring to axially limit the tolerance compensation ring, effectively preventing axial displacement caused by centrifugal force or temperature changes during high-speed operation. This ensures the overall stability and connection reliability of the rotor assembly. The balance ring is fixedly mounted on the shaft, providing a robust support point and preventing the tolerance compensation ring from loosening or falling off, thereby improving the motor's operational safety and lifespan. Furthermore, the balance ring facilitates rotor dynamic balance adjustment, helping to reduce vibration and noise.

[0009] Preferably, the balance ring and the rotating shaft are fixed together by an interference fit heat sleeve.

[0010] It is worth noting that the interference fit heat-shrink fastening method provides a high-strength connection, ensuring that the balance ring and the shaft remain in close contact under high-speed rotation and high-temperature conditions. This can prevent loosening caused by centrifugal force or thermal expansion. This structure can effectively transmit torque and axial force, reduce stress concentration at the connection points, and improve the overall rigidity and durability of the rotor.

[0011] Preferably, the axial limiting structure includes a retaining ring groove machined on the rotating shaft and a shaft retaining ring adapted to the retaining ring groove, wherein the shaft retaining ring is engaged in the retaining ring groove and located at the axial end of the tolerance compensation ring.

[0012] It is worth noting that this structure uses a retaining ring groove and a shaft retaining ring to achieve axial positioning, which has the advantages of convenient installation, disassembly and flexible adjustment. It facilitates maintenance and replacement of the tolerance compensation ring, reduces the maintenance cost of the motor, and the shaft retaining ring can effectively withstand axial force, prevent the tolerance compensation ring from shifting during high-speed operation, and ensure the stability of the connection.

[0013] Preferably, the axial limiting structure includes a shoulder integrally formed on one side wall of the rotating shaft and a locking nut threaded to the other side wall of the rotating shaft, wherein the tolerance compensation ring and the rotor core are axially pressed between the shoulder and the locking nut.

[0014] It is worth noting that this structure achieves adjustable axial clamping through the shaft shoulder and locking nut, which can automatically compensate for different assembly tolerances and thermal deformation, thereby ensuring close contact between the tolerance compensation ring and the rotor core, preventing relative slippage. The locking nut can provide uniform clamping force, reduce local stress concentration, avoid core deformation, and improve the structural integrity and safety of the rotor.

[0015] Preferably, the tolerance compensation ring is made of spring steel.

[0016] It is worth noting that spring steel has a high elastic modulus and excellent fatigue strength, which enables the tolerance compensation ring to maintain stable elastic deformation under high speed and high temperature conditions, and can effectively compensate for dimensional changes and assembly tolerances between the shaft and the rotor core.

[0017] Preferably, the concave-convex mating structure is a wave-shaped ring structure.

[0018] It is worth noting that the wave-shaped annular structure provides uniformly distributed concave and convex features, which can generate multi-directional elastic deformation under pressure, better compensate for tolerances and thermal expansion in the circumferential direction, and prevent relative slippage between the shaft and the rotor core.

[0019] Preferably, a mating stop for installation and positioning is provided on the rotating shaft at a position corresponding to the tolerance compensation ring; the mating stop is an annular shoulder, which is integrally formed with the rotating shaft, and its outer diameter is larger than the inner diameter of the tolerance compensation ring, for radial support and axial positioning of the tolerance compensation ring.

[0020] It is worth noting that the mating parts provide precise installation positioning points, which can ensure that the tolerance compensation ring is accurately positioned on the rotating shaft, avoiding performance degradation caused by assembly errors.

[0021] Preferably, the rotor core and the shaft are interference fit.

[0022] It is worth noting that the interference fit provides a high-strength connection, which can effectively transmit torque and withstand centrifugal force, prevent relative movement between the shaft and the rotor core, and ensure the stability of motor operation.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a tolerance compensation ring set between the shaft and the rotor core. The ring is made of elastic material and has a concave-convex fit structure. During assembly and operation, when the rotor undergoes dimensional changes due to centrifugal force or temperature rise, the tolerance compensation ring can undergo controllable elastic deformation, automatically filling and compensating for the fit clearance caused by thermal expansion and machining tolerance. This feature effectively eliminates the relative circumferential sliding between the shaft and the rotor core caused by the clearance under high-speed conditions, fundamentally solving the problems of abnormal noise and vibration, and significantly improving the NVH performance of the motor. 2. Through the synergistic effect of axial limiting structures (such as balance rings, shaft retaining rings, or combinations of lock nuts and shaft shoulders) and tolerance compensation rings, reliable axial fixation is achieved while allowing the tolerance compensation rings to undergo free elastic deformation in the radial direction. This design not only ensures the overall stability of the rotor assembly under high-speed rotation and prevents components from loosening, but also avoids excessively increasing the interference fit in pursuit of connection strength. This eliminates rotor core deformation and potential rotor rubbing risks caused by excessive assembly stress, ensuring the motor's operational safety and structural integrity. 3. This utility model integrates the reliability of interference fit connection with the adaptability of elastic compensation. The basic interference fit between the rotor core and the shaft is responsible for transmitting the main torque and resisting centrifugal force, while the tolerance compensation ring is dedicated to compensating for dynamic tolerance and absorbing vibration. The two complement each other, so that the rotor structure has high connection strength and centrifugal force resistance while also having excellent tolerance compensation and shock vibration resistance characteristics. This solves the technical contradictions under high speed and high temperature conditions and improves the operating stability and reliability of the motor. Attached Figure Description

[0024] Figure 1 The diagram shown is a schematic representation of the entire utility model. Figure 2 This utility model is shown. Figure 1 Schematic diagram of the cross section at point AA; Figure 3 The diagram shown is a three-dimensional disassembled structural schematic of the first embodiment of the axial limiting structure of this utility model; Figure 4 The diagram shown is a cross-sectional view of a second embodiment of the axial limiting structure of this utility model. Figure 5 The diagram shown is a cross-sectional view of the third embodiment of the axial limiting structure of this utility model; Figure 6 This utility model is shown. Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0025] Reference numerals in the attached drawings: 1. Tolerance compensation ring; 2. Shaft; 3. Rotor core; 4. Balance ring; 5. Snap ring groove; 6. Shaft retaining ring; 7. Shaft shoulder; 8. Locking nut; 9. Annular shoulder. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] To address the problems in existing technologies, such as circumferential slippage between the shaft and rotor core during high-speed operation, core deformation due to interference fit, and abnormal noise generated by traditional keyed connections under high temperature and high speed, the following technical solutions are proposed. Please refer to [link / reference]. Figures 1-6 ; A high-speed motor rotor structure includes a rotating shaft 2 and a rotor core 3 mounted on the rotating shaft 2, and also includes an annular tolerance compensation ring 1 and an axial limiting structure for axially limiting the tolerance compensation ring 1; the tolerance compensation ring 1 is disposed between the rotating shaft 2 and the rotor core 3 and is made of elastic material, and at least one concave-convex fitting structure is provided on its inner circumferential surface and outer circumferential surface to undergo elastic deformation under pressure to compensate for the assembly tolerance between the rotating shaft 2 and the rotor core 3.

[0028] Example 1: In this example, specifically, the axial limiting structure includes balance rings 4 respectively disposed at both ends of the rotor core 3, and the balance rings 4 are fixedly mounted on the rotating shaft 2.

[0029] This structure achieves reliable axial constraint on the tolerance compensation ring 1 and the rotor core 3 through the balance ring 4, effectively preventing axial movement under high-speed operation. The balance ring 4 itself also serves as a counterweight, facilitating precise dynamic balancing correction of the rotor assembly after assembly, thereby reducing vibration and noise from the source and significantly improving the NVH performance and running stability of the motor.

[0030] In this embodiment, specifically, the balance ring 4 and the rotating shaft 2 are fixed by an interference fit heat sleeve.

[0031] The interference fit heat-shrink fastening method forms a high-strength permanent connection with a strong bearing capacity at the joint surface. This ensures that the balance ring 4 remains tightly integrated with the shaft 2 even under long-term centrifugal force and thermal cycling loads, eliminating vibrations that may be caused by loose connections.

[0032] Example 2: In this example, specifically, the axial limiting structure includes a retaining ring groove 5 machined on the rotating shaft 2 and a shaft retaining ring 6 adapted to the retaining ring groove 5. The shaft retaining ring 6 is engaged in the retaining ring groove 5 and located at the axial end of the tolerance compensation ring 1.

[0033] This limiting method has a compact structure and is easy to install and disassemble. It uses the standard shaft retaining ring 6 to achieve axial fixation of the tolerance compensation ring 1, which greatly simplifies the assembly and subsequent maintenance process. When it is necessary to replace the tolerance compensation ring 1 or maintain the rotor core 3, the shaft retaining ring 6 can be easily removed. It has excellent maintainability and effectively reduces maintenance costs and time.

[0034] Example 3: In this example, specifically, the axial limiting structure includes a shoulder 7 integrally formed on one side wall of the rotating shaft 2 and a locking nut 8 threadedly connected to the other side wall of the rotating shaft 2. The tolerance compensation ring 1 and the rotor core 3 are axially pressed between the shoulder 7 and the locking nut 8.

[0035] This structure allows for precise control of axial clamping force by rotating the locking nut 8, enabling adjustable control of the component clamping degree. This feature can actively adapt to and compensate for certain axial dimensional chain tolerances, while ensuring that the tolerance compensation ring 1 is uniformly pre-compressed and in the best working state, so that the connection structure can remain stable under various working conditions and has strong impact resistance and loosening resistance.

[0036] In this embodiment, specifically, the tolerance compensation ring 1 is made of spring steel.

[0037] In this embodiment, specifically, the concave-convex mating structure is a waveform ring structure.

[0038] In this embodiment, specifically, a mating stop for installation and positioning is provided on the rotating shaft 2 at the position corresponding to the tolerance compensation ring 1; the mating stop is an annular shoulder 9, which is integrally formed with the rotating shaft 2, and its outer diameter is larger than the inner diameter of the tolerance compensation ring 1, and is used to provide radial support and axial positioning for the tolerance compensation ring 1.

[0039] In this embodiment, specifically, the rotor core 3 and the shaft 2 are interference fit.

[0040] Working principle: During assembly, the tolerance compensation ring 1 is first fitted onto the rotating shaft 2 and accurately positioned by the annular shoulder 9. Then, the rotor core 3 is pressed into the designed position of the rotating shaft 2. During this process, the interference fit between the rotor core 3 and the rotating shaft 2 provides basic connection strength. At the same time, the inner hole of the rotor core 3 compresses the tolerance compensation ring 1 made of spring steel, causing its wave-shaped annular structure to produce radial elastic deformation, thereby accurately filling and compensating for the fit clearance and dimensional tolerance between the rotating shaft 2 and the rotor core 3. When the motor runs at high speed, the rotor system undergoes dynamic dimensional changes due to centrifugal force and temperature rise. The tolerance compensation ring 1 continuously plays an elastic compensation role, eliminating the fit clearance through its adaptive deformation, and effectively suppressing possible circumferential fretting wear and relative sliding between the shaft 2 and the rotor core 3. Regarding axial constraints, there are differences depending on the specific implementation method: If the structure of Embodiment 1 is adopted, the balance ring 4 and the rotating shaft 2 are fixed by an interference fit heat sleeve, which provides rigid axial constraint for the tolerance compensation ring 1 and the entire rotor assembly. If the structure of Embodiment 2 is adopted, the tolerance compensation ring 1 is provided with precise axial positioning and reliable limiting by inserting the shaft retaining ring 6 into the pre-set retaining ring groove 5 on the rotating shaft 2; If the structure of embodiment 3 is adopted, the tolerance compensation ring 1 and the rotor core 3 are axially pressed between the integrally formed shoulder 7 and the locking nut 8 by rotating the locking nut 8 along the threaded section of the shaft 2, thereby achieving adjustable axial clamping force and stable constraint. Through the synergistic effect of the above structures, the rotor system is ensured to maintain a stable connection state under high-speed and high-temperature conditions, which can effectively achieve vibration and noise suppression, connection reliability improvement and long-term stable operation.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A high-speed motor rotor structure, comprising a rotating shaft (2) and a rotor core (3) mounted on the rotating shaft (2), characterized in that: It also includes an annular tolerance compensation ring (1) and an axial limiting structure for axially limiting the tolerance compensation ring (1); the tolerance compensation ring (1) is disposed between the rotating shaft (2) and the rotor core (3) and is made of elastic material, and at least one concave-convex fitting structure is provided on its inner circumferential surface and outer circumferential surface for elastic deformation under pressure to compensate for the assembly tolerance between the rotating shaft (2) and the rotor core (3).

2. The high-speed motor rotor structure according to claim 1, characterized in that: The axial limiting structure includes balance rings (4) respectively disposed at both ends of the rotor core (3), and the balance rings (4) are fixedly mounted on the rotating shaft (2).

3. The high-speed motor rotor structure according to claim 2, characterized in that: The balance ring (4) and the rotating shaft (2) are fixed together by an interference fit heat sleeve.

4. The high-speed motor rotor structure according to claim 1, characterized in that: The axial limiting structure includes a retaining ring groove (5) machined on the rotating shaft (2) and a shaft retaining ring (6) adapted to the retaining ring groove (5). The shaft retaining ring (6) is engaged in the retaining ring groove (5) and located at the axial end of the tolerance compensation ring (1).

5. A high-speed motor rotor structure according to claim 1, characterized in that: The axial limiting structure includes a shoulder (7) integrally formed on one side wall of the rotating shaft (2) and a locking nut (8) threaded to the other side wall of the rotating shaft (2). The tolerance compensation ring (1) and the rotor core (3) are axially pressed between the shoulder (7) and the locking nut (8).

6. A high-speed motor rotor structure according to any one of claims 1-5, characterized in that: The tolerance compensation ring (1) is made of spring steel.

7. A high-speed motor rotor structure according to any one of claims 1-5, characterized in that: The concave-convex mating structure is a wave-shaped ring structure.

8. A high-speed motor rotor structure according to any one of claims 1-5, characterized in that: The rotating shaft (2) is provided with a mating stop for installation and positioning at the position corresponding to the tolerance compensation ring (1); the mating stop is an annular shoulder (9), which is integrally formed with the rotating shaft (2), and its outer diameter is larger than the inner diameter of the tolerance compensation ring (1), and is used to provide radial support and axial positioning for the tolerance compensation ring (1).

9. A high-speed motor rotor structure according to any one of claims 1-5, characterized in that: The rotor core (3) and the shaft (2) are interference fit.

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