Motor rotating shaft

Abstract

The invention discloses a motor rotating shaft, and relates to the technical field of motor rotating shafts, the motor rotating shaft comprises a shaft body, the upper end and the lower end of the inner side of the shaft body are each of a hollow structure, a honeycomb-shaped shaft core layer is arranged in each hollow structure, and a plurality of annular elastic damping middle layers are fixedly connected to the inner wall of each hollow structure at equal intervals; a plurality of arc-shaped boss outer layers are arranged on the outer portion of the shaft body at equal intervals, and self-compensation type balance units are arranged on the outer sides of the upper end and the lower end of the shaft body. Through the fiber interwoven structure of the regular hexagon symmetrical honeycomb holes of the honeycomb-shaped shaft core layer and the annular elastic damping middle layer, load treatment of rigid stress dispersion and flexible vibration buffering is formed, and meanwhile torque borne by the shaft body is evenly dispersed to the whole section through the regular hexagon honeycomb holes; the annular elastic damping middle layer absorbs vibration energy in the dispersion process through material deformation, stress transmission and vibration attenuation are synchronously carried out, and the anti-fatigue performance of the shaft body under the alternating load is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of motor shaft technology, and in particular to a motor shaft. Background Technology

[0002] In the field of motor shaft technology, the motor shaft, as a key structure for transmitting power and connecting core components, directly determines the motor's operational stability, energy efficiency, and service life. Currently, traditional motor shafts struggle to meet the operational demands of modern motors—high speed, high load, and low loss—in practical applications. There are limitations in balancing lightweight design and strength. Traditional motor shafts often employ a solid or simple hollow structure. Choosing a solid shaft to increase load capacity results in an excessively heavy shaft, increasing motor energy consumption and limiting start-stop response speed due to excessive moment of inertia. Using a hollow shaft for lightweighting often reduces weight by decreasing material thickness, but this significantly weakens the shaft's torsional strength and buckling resistance, making it prone to deformation, bending, and even breakage at high speeds. Vibration damping performance is also insufficient, making it difficult to adapt to stable operation under complex conditions. Existing motor shaft vibration damping designs often rely on a single structure, such as wrapping the shaft surface with a rubber damping layer or using a simple spring buffer structure. Such designs can only absorb vibrations within a specific frequency range, resulting in a narrow damping frequency range. When facing low-frequency impact loads during motor start-up and braking, the rubber damping layer's deformation capacity is limited, making it difficult to effectively buffer the impact. During high-speed stable operation, high-frequency vibrations generated by the shaft can easily penetrate the damping layer and transmit inwards, exacerbating the damage to the shaft system and bearings. Wear and tear on mating components can lead to significant operating noise and reduce the overall stability of the motor. The lack of dynamic balance adjustment capability limits high-speed operating accuracy. Traditional motor shaft balance calibration relies heavily on static balance calibration before shipment, achieved by adding counterweights at specific locations on the shaft. However, since the static balance structure cannot be adjusted in real time during operation, eccentric vibrations easily occur when the shaft rotates at high speeds. This increases the concentricity deviation between the shaft and the motor rotor and bearings, reducing power transmission efficiency and exacerbating fatigue wear on core components, thus shortening the motor's lifespan. Furthermore, it's difficult to balance wear resistance and ease of maintenance. Traditional motor shafts often use electroplating hard chrome or thermal spraying for their outer wear-resistant structure. These coatings have low bonding strength with the shaft substrate, making them prone to peeling and cracking under long-term high-frequency friction and load impact, leading to increased wear on the shaft surface. Additionally, shaft connections often use welding or flange splicing to connect with other components, creating points of interruption in force transmission. Stress concentration can occur during torque fluctuations, potentially causing the connection to break. A motor shaft needs to be designed to solve the problems mentioned above. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a motor shaft, comprising a shaft body, wherein the upper and lower ends of the inner side of the shaft body are hollow structures, each hollow structure is provided with a honeycomb core layer, and the inner wall of the hollow structure is fixedly connected with a plurality of annular elastic damping intermediate layers at equal intervals, and the outer side of the shaft body is provided with a plurality of arc-shaped boss outer layers at equal intervals, and a self-compensating balance unit is provided on the outer sides of both the upper and lower ends of the shaft body; The honeycomb core layer is used to significantly improve the torsional strength and buckling resistance of the shaft while ensuring its lightweight design; The annular elastic damping intermediate layer is used to absorb vibration energy and buffer impact loads during shaft operation, thereby reducing the transmission of vibration to the inside of the shaft. The outer layer of the arc-shaped boss is used to enhance the wear resistance and fatigue resistance of the shaft surface and optimize the contact stress distribution between the shaft and the mating parts; The self-compensating balancing unit is used to compensate for the dynamic imbalance of the shaft in real time during the shaft rotation process, thereby improving the stability of the shaft system operation. The inner center of the shaft is a built-in solid structure. Inside the built-in solid structure, three sets of axially symmetrical annular sealed chambers are arranged at equal intervals. Narrow slits are provided at the four corners of the solid structure, and the four corners of the three sets of axially symmetrical annular sealed chambers are connected through the narrow slits.

[0004] Preferably, the self-compensating balancing unit is an annular sealed cavity, and a number of positioning grooves are equidistantly arranged inside the self-compensating balancing unit. A high-density spherical balancing body is engaged on the inner side of each positioning groove.

[0005] Preferably, the honeycomb core layers are all made using a three-dimensional weaving process, and their honeycomb cells are symmetrically distributed in regular hexagons; The annular elastic damping intermediate layer is formed by interweaving flexible composite materials and metal fibers. The outer layer of the arc-shaped boss is bonded to the middle layer by laser cladding process, and is evenly distributed and axially symmetrical along the axis of the shaft.

[0006] Preferably, a filling port is provided transversely through the middle of the outer layer of the central arc-shaped boss, and the filling port penetrates the central annular sealed cavity; Both the annular sealed chamber and the narrow slit are filled with low-viscosity damping fluid. When the shaft is subjected to radial load or undergoes bending deformation, the damping effect generated by the narrow slit can dissipate energy and further suppress the vibration amplitude of the shaft. The low viscosity characteristics ensure that the damping fluid has good fluidity in the narrow slit. The width of the narrow slit is 1 / 5 to 1 / 8 of the diameter of the annular sealed chamber, and the inner wall of the narrow slit is rounded.

[0007] Preferably, the positioning grooves all use elastic rubber as a buffer layer; The high-density spherical balance body is made of wear-resistant high-density alloy, and the total mass of the high-density spherical balance body is 2%-3% of the total mass of the shaft.

[0008] Preferably, a connecting section is provided on the upper outer side of the shaft, and the outer side of the connecting section is provided with an external thread for connecting with the internal thread structure of the motor rotor or other transmission components. The connecting section and the shaft are integrally formed to ensure the structural strength of the connecting part at the upper end of the shaft, so that the force flow is continuous when the shaft transmits torque.

[0009] Preferably, the ratio of the axial diameter of the connecting segment to the axial diameter of the shaft body is 1:1.2; The ratio of the axial diameter of the outer layer of the arc-shaped boss and the self-compensating balancing unit to the axial diameter of the shaft is 1:1.5-1:1.8.

[0010] In summary, the present invention provides a motor shaft with the following beneficial effects: 1. Through the interwoven fiber structure of the hexagonal symmetrical honeycomb holes in the honeycomb core layer and the annular elastic damping intermediate layer, a load treatment that combines rigid stress dispersion and flexible vibration buffering is formed. At the same time, the hexagonal honeycomb holes evenly distribute the torque borne by the shaft to the entire cross section, while the annular elastic damping intermediate layer absorbs the vibration energy during the dispersion process through material deformation, realizing the synchronous transmission of stress and vibration attenuation, which significantly improves the fatigue resistance of the shaft under alternating loads.

[0011] 2. Through the axially symmetrical distribution of the annular sealed chambers and the narrow slits, dynamic damping adjustment of the chamber fluid storage and the narrow slits is achieved. This ensures that the damping fluid is subjected to balanced forces during shaft rotation and precisely controls the flow resistance of the damping fluid. The damping effect adapts to the bending deformation of the shaft, maintaining low resistance to reduce energy consumption while ensuring stable operation at low speeds. It also increases the damping force to enhance vibration reduction during high-speed vibration of the shaft, achieving intelligent adaptation of damping performance. Through the transverse through-hole layout of the filling port and the connecting structure of the annular sealed chambers, combined with the connecting effect of the narrow slits, the damping fluid filling or replacement of all chambers can be completed with a single injection. Maintenance can be performed without disassembling the shaft, greatly simplifying the cumbersome process of traditional shaft damping systems that require overall disassembly and improving maintenance efficiency.

[0012] 3. Through the mass ratio design of the annular sealed cavity of the self-compensating balancing unit and the high-density spherical balancing body, a dynamic balancing system is formed. The annular cavity provides the balancing body with no dead angle adjustment space, and the 2%-3% mass ratio of the shaft ensures that the balancing body has sufficient adjustment torque without adding extra load. With the elastic rubber layer of the positioning groove for buffering, it can still respond quickly and offset the eccentric error when the shaft speed fluctuates. Through the laser cladding process of the outer layer of the arc-shaped boss and the integrated molding design of the connecting section, the entire shaft strength is guaranteed by surface wear resistance and continuous force flow. The laser cladding forms a metallurgical bond between the outer layer of the arc-shaped boss and the shaft, avoiding the problem of easy coating peeling. The integrated connecting section eliminates the interruption point of force flow in torque transmission, allowing the shaft to maintain structural integrity under the dual action of high-frequency friction and strong torque, and extending the replacement cycle of core components. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a motor shaft according to the present invention; Figure 2 This is a three-dimensional cross-sectional view of a motor shaft according to the present invention; Figure 3 This is a cross-sectional schematic diagram of the three-dimensional structure of a motor shaft according to the present invention; Figure 4 This is a schematic cross-sectional view of the main structure of a motor shaft according to the present invention; Figure 5 This is a three-dimensional cross-sectional structural diagram of a self-compensating balancing unit for a motor shaft according to the present invention. Figure 6 This is a top view cross-sectional structural diagram of a motor shaft according to the present invention.

[0014] Explanation of reference numerals in the attached figures: 1. Shaft body; 2. Honeycomb core layer; 3. Annular elastic damping intermediate layer; 4. Built-in solid structure; 5. Annular sealed chamber; 6. Narrow slit; 7. Arc-shaped boss outer layer; 8. Filling port; 9. Self-compensating balance unit; 10. Positioning groove; 11. High-density spherical balance body; 12. Connecting section; 13. External thread. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.

[0016] Example: Please see Figures 1-6As shown, the present invention provides a technical solution: a motor shaft, including a shaft body 1, the upper and lower ends of the inner side of the shaft body 1 are hollow structures, a honeycomb core layer 2 is provided inside the hollow structure, a number of annular elastic damping intermediate layers 3 are fixedly connected at equal intervals to the inner wall of the hollow structure, a number of arc-shaped boss outer layers 7 are provided at equal intervals on the outer side of the shaft body 1, and a self-compensating balance unit 9 is provided on the outer side of both the upper and lower ends of the shaft body 1. The honeycomb core layer 2 is used to significantly improve the torsional strength and buckling resistance of the shaft body 1 by means of honeycomb holes while ensuring the lightweight of the shaft body 1. The annular elastic damping intermediate layer 3 is used to absorb vibration energy and buffer impact loads during the operation of the shaft 1, thereby reducing the transmission of vibration to the interior of the shaft 1. The outer layer 7 of the arc-shaped boss is used to enhance the wear resistance and fatigue resistance of the surface of the shaft 1 and optimize the contact stress distribution between the shaft 1 and the mating parts; The self-compensating balancing unit 9 is used to compensate for the dynamic imbalance of shaft 1 in real time during the rotation of shaft 1, thereby improving the stability of shaft system operation. The inner center of the shaft 1 is a built-in solid structure 4. Inside the built-in solid structure 4, three sets of axially symmetrical annular sealed chambers 5 are equidistantly arranged. At the four corners of the built-in solid structure 4, narrow slits 6 are provided. The four corners of the three sets of axially symmetrical annular sealed chambers 5 are connected through the narrow slits 6.

[0017] The self-compensating balancing unit 9 is an annular sealed cavity. Several positioning grooves 10 are equidistantly arranged inside the self-compensating balancing unit 9. High-density spherical balance bodies 11 are engaged on the inner side of each positioning groove 10. The self-compensating balancing unit 9 constrains the movement range of the high-density spherical balance bodies 11 through the positioning grooves 10. When the shaft 1 rotates at high speed, the high-density spherical balance bodies 11 can adaptively slide with the centrifugal force, compensate for the unbalance in real time, significantly reduce shaft vibration, and improve the dynamic adjustment accuracy of the self-compensating balancing unit 9.

[0018] The honeycomb core layer 2 is made using a three-dimensional braiding process. Its honeycomb cells are symmetrically distributed in a regular hexagonal pattern. The three-dimensional braiding process enhances the structural integrity of the honeycomb core layer 2. The symmetrically distributed regular hexagonal honeycomb cells enable the honeycomb core layer 2 to be lightweight while uniformly distributing the torque and radial force borne by the shaft 1, thus significantly improving the torsional stiffness of the core. The annular elastic damping intermediate layer 3 is formed by interweaving flexible composite materials and metal fibers. The flexible composite material gives the annular elastic damping intermediate layer 3 good deformation ability to absorb vibration energy, and the metal fibers enhance its structural strength, so that the annular elastic damping intermediate layer 3 has both shock absorption and tensile resistance properties, effectively blocking the transmission of vibration to the inside of the shaft 1. The outer layer 7 of the arc-shaped boss is bonded to the intermediate layer by laser cladding process. It is evenly distributed and axially symmetrical along the axis of the shaft 1. The laser cladding process ensures that the outer layer 7 of the arc-shaped boss is firmly bonded to the intermediate layer. The axially symmetrical distribution makes the outer layer 7 of the arc-shaped boss evenly stressed when the shaft 1 rotates. The arc structure optimizes the stress distribution of the mating surface and enhances the wear resistance and fatigue resistance of the outer layer 7 of the arc-shaped boss.

[0019] A filling port 8 is transversely provided in the middle of the outer layer 7 of the central arc-shaped boss. The filling port 8 passes through the central annular sealed chamber 5. The filling port 8 facilitates the precise filling of damping fluid into the annular sealed chamber 5 and the narrow slit 6. The filling port 8 can also be used to replenish or replace the damping fluid, ensuring the long-term effectiveness of the damping system in the annular sealed chamber 5 and simplifying the maintenance process. After the damping fluid is filled, the two ends of the filling port 8 can be sealed with sealing glue. Both the annular sealed chamber 5 and the narrow slit 6 are filled with low-viscosity damping fluid. When the shaft 1 is subjected to radial load or undergoes bending deformation, the energy can be dissipated through the damping effect generated by the narrow slit 6, further suppressing the vibration amplitude of the shaft 1. The low viscosity characteristics ensure that the damping fluid has good fluidity in the narrow slit 6. Through the smooth flow of the low-viscosity damping fluid between the annular sealed chamber 5 and the narrow slit 6, it can form a synergistic vibration reduction system with the annular elastic damping intermediate layer 3, widening the vibration reduction frequency range of the shaft 1 and improving the vibration reduction effect under complex working conditions. The width of the narrow slit 6 is 1 / 5 to 1 / 8 of the diameter of the annular sealed chamber 5. The inner wall of the narrow slit 6 is rounded to provide moderate resistance to the flow of damping fluid to enhance energy dissipation efficiency, while avoiding excessive resistance that would affect the response speed. The rounded transition reduces stress concentration at the narrow slit 6 and prevents the shaft 1 from cracking due to fatigue after long-term use.

[0020] The positioning grooves 10 all use elastic rubber as a buffer layer. The elastic rubber buffer layer can reduce the collision and impact between the high-density spherical balance body 11 and the positioning grooves 10, reduce the noise during balance adjustment, and at the same time avoid rigid contact that causes wear of the positioning grooves 10, thus extending the service life of the self-compensating balance unit 9. The high-density spherical balance body 11 is made of wear-resistant high-density alloy, and the total mass of the high-density spherical balance body 11 is 2%-3% of the total mass of the shaft body 1. The wear-resistant high-density alloy ensures that the high-density spherical balance body 11 is not easily worn during long-term sliding, thus maintaining balance accuracy. The 2%-3% mass ratio ensures that the self-compensating balance unit 9 has sufficient adjustment torque without increasing the extra load on the shaft body 1, thus balancing balance effect and operating efficiency.

[0021] A connecting section 12 is provided on the upper outer side of the shaft 1. The outer side of the connecting section 12 is provided with an external thread 13 for connecting with the internal thread structure of the motor rotor or other transmission components. The connecting section 12 and the shaft 1 are integrally formed to ensure the structural strength of the connection part at the upper end of the shaft 1, so that the force flow of the shaft 1 is continuous when transmitting torque. The integrally formed connecting section 12 avoids weak points in the splicing. The design of the external thread 13 makes the connection more stable. The continuous force flow characteristic reduces torque transmission loss, improves the transmission efficiency of the shaft 1, and reduces the risk of breakage of the connecting section 12.

[0022] The ratio of the axial diameter of the connecting section 12 to the axial diameter of the shaft 1 is 1:1.2, which makes the connecting section 12 have sufficient strength to bear the load, and also reduces the air resistance when the shaft 1 rotates by appropriately reducing the diameter. At the same time, it is easy for the connecting section 12 to match standard transmission components, thus improving the versatility of the shaft 1. The ratio of the axial diameter of the outer arc-shaped boss 7 and the self-compensating balancing unit 9 to the axial diameter of the shaft 1 is 1:1.5-1:1.8, ensuring that the outer arc-shaped boss 7 has sufficient wear-resistant area and the self-compensating balancing unit 9 has sufficient adjustment space, while avoiding excessive increase in the volume and rotational inertia of the shaft 1, making the shaft 1 more suitable for installation in compact spaces.

[0023] The implementation principle of this application embodiment is as follows: First, when the shaft 1 is driven to start rotating, the honeycomb core layer 2, made of a regular hexagonal symmetrical honeycomb structure through a three-dimensional weaving process, bears the basic load and evenly distributes the torque and radial force generated during startup to the entire shaft 1. While achieving the lightweighting of the shaft 1, it provides sufficient torsional stiffness and avoids buckling deformation of the shaft 1 due to instantaneous startup stress. At the same time, the flexible composite material and metal fiber interwoven structure of the annular elastic damping intermediate layer 3 begin to undergo elastic deformation. Through internal friction of the material, the initial vibration energy is converted into heat energy dissipation, and the vibration is initially blocked from being transmitted to the interior of the shaft 1. Then, as the rotational speed of shaft 1 gradually increases to a stable operating state, the self-compensating balancing unit 9 starts dynamic balancing adjustment. The high-density spherical balance body 11 inside slides along the positioning groove 10 under the action of centrifugal force. The elastic rubber buffer layer in the positioning groove 10 plays a role in constraining and buffering the movement of the high-density spherical balance body 11, enabling it to adaptively adjust its position. Since the total mass of the high-density spherical balance body 11 accounts for 2%-3% of the total mass of shaft 1, it can accurately compensate for the centrifugal force deviation caused by uneven material or assembly error of shaft 1, effectively reducing shaft vibration noise. Secondly, while the self-compensating balance unit 9 is adjusting, the low-viscosity damping fluid in the annular sealed chamber 5 forms a dynamic pressure field under the action of centrifugal force. When the shaft 1 is subjected to radial load and undergoes bending deformation, the damping fluid generates a throttling damping effect through the narrow slit 6 with a width of 1 / 5-1 / 8 of the diameter of the annular sealed chamber 5. This forms a composite damping effect with the annular elastic damping intermediate layer 3, further enhancing the damping effect of the shaft 1. Moreover, the rounded corner transition treatment of the inner wall of the narrow slit 6 not only ensures the damping efficiency but also avoids the shaft 1 from developing fatigue cracks due to stress concentration. Furthermore, the outer arc-shaped boss 7 on the outside of the shaft 1 plays a role in surface protection and stress optimization during operation. The high-hardness surface layer made by laser cladding process can effectively resist wear when it comes into contact with mating parts. The axially symmetrical arc-shaped contour optimizes the contact stress distribution and reduces local wear. At the same time, the uniform distribution of the arc-shaped boss 7 along the axis of the shaft 1 can guide the orderly flow of air and reduce wind resistance interference when the shaft 1 rotates at high speed. Subsequently, the connecting section 12 at the upper outer side of the shaft 1 is connected to the motor rotor or other transmission components through the external thread 13. The integral structure of the connecting section 12 and the shaft 1 ensures continuous force flow during torque transmission. Furthermore, the thread helix angle of the external thread 13 is matched with the arc curvature radius of the outer layer 7 of the arc boss, so that the load transmission direction is consistent with the stress distribution direction of the shaft 1, thereby improving transmission efficiency. Finally, due to the long-term operation requirements of the shaft 1, the filling port 8 on the outer layer 7 of the central arc-shaped boss can replenish the annular sealed chamber 5 and the narrow slit 6 with low-viscosity damping fluid through the channel that passes through the central annular sealed chamber 5, ensuring good fluidity of the damping fluid in the narrow slit 6, maintaining the long-term effective operation of the damping system, and providing continuous protection for the stable operation of the shaft 1.

[0024] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor shaft, comprising a shaft body (1), characterized in that: The inner upper and lower ends of the shaft (1) are hollow structures. The hollow structure is provided with a honeycomb core layer (2). The inner wall of the hollow structure is fixedly connected with several annular elastic damping intermediate layers (3) at equal intervals. The outer side of the shaft (1) is provided with several arc-shaped boss outer layers (7) at equal intervals. The outer sides of the upper and lower ends of the shaft (1) are provided with self-compensating balance units (9). The honeycomb core layer (2) is used to significantly improve the torsional strength and buckling resistance of the shaft (1) by means of honeycomb holes while ensuring the lightweight of the shaft (1); The annular elastic damping intermediate layer (3) is used to absorb vibration energy and buffer impact loads during shaft (1) operation, and reduce the transmission of vibration to the inside of shaft (1); The outer layer (7) of the arc-shaped boss is used to enhance the wear resistance and fatigue resistance of the shaft body (1) surface and optimize the contact stress distribution between the shaft body (1) and the mating parts; The self-compensating balancing unit (9) is used to compensate for the dynamic imbalance of the shaft (1) in real time during the rotation of the shaft (1), thereby improving the stability of the shaft system operation. The inner center of the shaft (1) is a built-in solid structure (4). The interior of the built-in solid structure (4) is provided with three sets of axially symmetrical annular sealed chambers (5) at equal intervals. Narrow slits (6) are provided at the four corners of the interior of the solid structure (4). The four corners of the three sets of axially symmetrical annular sealed chambers (5) are connected through the narrow slits (6).

2. The motor shaft according to claim 1, characterized in that: The self-compensating balancing unit (9) is an annular sealed cavity. Several positioning grooves (10) are equidistantly arranged inside the self-compensating balancing unit (9). High-density spherical balancing bodies (11) are engaged on the inner side of each positioning groove (10).

3. A motor shaft according to claim 1, characterized in that: The honeycomb core layer (2) is made by three-dimensional weaving process, and its honeycomb holes are symmetrically distributed in regular hexagons; The annular elastic damping intermediate layer (3) is formed by interweaving flexible composite materials and metal fibers; The outer layer (7) of the arc-shaped boss is combined with the middle layer by laser cladding process, and is evenly distributed and axially symmetrical along the axis of the shaft (1).

4. A motor shaft according to claim 1, characterized in that: A filling port (8) is provided transversely through the middle of the outer layer (7) of the arc-shaped boss in the middle part, and the filling port (8) penetrates the annular sealed chamber (5) in the middle part. Both the annular sealed chamber (5) and the narrow slit (6) are filled with low-viscosity damping fluid, which is used to dissipate energy through the damping effect generated by the narrow slit (6) when the shaft (1) is subjected to radial load or undergoes bending deformation, further suppressing the vibration amplitude of the shaft (1), and the low viscosity characteristics ensure that the damping fluid has good fluidity in the narrow slit (6). The width of the slit (6) is 1 / 5 to 1 / 8 of the diameter of the annular sealed chamber (5), and the inner wall of the slit (6) is rounded.

5. A motor shaft according to claim 2, characterized in that: The positioning grooves (10) are all made of elastic rubber as a buffer layer; The high-density spherical balance body (11) is made of wear-resistant high-density alloy, and the total mass of the high-density spherical balance body (11) is 2%-3% of the total mass of the shaft body (1).

6. A motor shaft according to claim 1, characterized in that: The upper outer end of the shaft (1) is provided with a connecting section (12), and the outer side of the connecting section (12) is provided with an external thread (13) for connecting with the internal thread structure of the motor rotor or other transmission components. The connecting section (12) and the shaft (1) are integrally formed to ensure the structural strength of the upper connection part of the shaft (1) so that the force flow of the shaft (1) is continuous when transmitting torque.

7. A motor shaft according to claim 6, characterized in that: The ratio of the axial diameter of the connecting section (12) to the axial diameter of the shaft (1) is 1:1.2; The ratio of the axial diameter of the outer layer of the arc-shaped boss (7) and the self-compensating balancing unit (9) to the axial diameter of the shaft (1) is 1:1.5-1:1.8.

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