Rotor structure

Abstract

The utility model relates to the technical field of motors, in particular to a rotor structure. Comprising a magnet, a shaft center and a shaft sleeve, the magnet is annular and magnetized in the radial direction, and the center part is hollow to form a center channel; the axis penetrates through the central channel; the shaft sleeve is arranged between the magnet and the axis, the inner surface is tightly attached to the outer surface of the axis, and the outer surface is tightly attached to the inner surface of the magnet. Furthermore, the shaft sleeve is made of an aluminum alloy material and can be provided with a glue storage groove, and the glue storage groove is arranged in the circumferential direction of the shaft sleeve and is of an annular groove structure. In addition, the number of the shaft sleeves can be one or two, and when the number of the shaft sleeves is two, the shaft sleeves are symmetrically distributed in the axial direction of the axis. By optimizing the structural design of the rotor, the stability and reliability of motor operation are improved, noise and vibration are reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor structure. BACKGROUND

[0002] The rotor structure is widely used in electric machines, generators and various rotating mechanical equipment, and is one of the core components of these devices. With the continuous progress of industrial technology, the design and manufacturing process of the rotor are continuously optimized to improve the overall performance and reliability of the equipment. Efficient rotor design not only improves the working efficiency of the equipment, but also prolongs the service life and reduces maintenance costs, thereby playing an important role in industrial production and daily life.

[0003] In existing rotor designs, in order to ensure the stability and transmission accuracy of the rotor, various fixing methods are used to install the magnet on the shaft. Common methods include directly sticking the magnet to the shaft with adhesive, or using a metal sleeve to tightly combine the magnet and the shaft. In addition, some designs use an embedded structure, i.e. the magnet is inlaid in the shaft, and the tight fit between the two is achieved through precision machining. Although these methods have their own characteristics, there are still some shortcomings in actual application.

[0004] The rotor structure in the prior art is prone to magnet loosening or falling off after a long time of operation, which is mainly due to the insufficient firmness of the connection between the magnet and the shaft, especially in high-speed rotation and high-temperature environments. This problem not only affects the normal operation of the equipment, but also can cause serious safety accidents. Therefore, how to improve the bonding strength between the magnet and the shaft and ensure its long-term stable operation has become a technical problem to be solved. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a rotor structure.

[0006] The above technical purpose of the present application is achieved by the following technical solution: a rotor structure, comprising:

[0007] a magnet, the magnet being annular and magnetized in the radial direction, and the center portion being hollow to form a center passage;

[0008] a shaft, provided in the center passage;

[0009] a shaft sleeve, provided between the magnet and the shaft, the inner surface of the shaft sleeve tightly abutting the outer surface of the shaft, and the outer surface of the shaft sleeve tightly abutting the inner surface of the magnet.

[0010] By adopting the above technical scheme, the shaft sleeve is closely fitted between the magnet and the shaft, effectively increasing the connection stability between the magnet and the shaft, solving the problem that the magnet is prone to loosening or falling off in the prior art under high-speed rotation and high-temperature environment, greatly improving the reliability and safety of the rotor structure, ensuring that the equipment can operate stably for a long time, reducing the failure and safety hazards caused by loosening of the magnet, and the structure design is relatively simple, easy to manufacture and assemble, which is conducive to reducing production cost and improving production efficiency, providing strong support for performance improvement of motors, generators and various rotating mechanical equipment, and promoting efficient and stable development of industrial production.

[0011] Optionally, the shaft sleeve is made of aluminum alloy material.

[0012] By adopting the above technical scheme, the aluminum alloy has the characteristics of light weight, which can effectively reduce the weight of the rotor as a whole, reduce the inertia during rotation, make the equipment more sensitive and efficient during starting, stopping and speed changing, and reduce energy consumption; the aluminum alloy has good heat conduction performance, which can quickly conduct the heat generated by the friction between the magnet and the shaft during the operation of the rotor, avoid local overheating to cause performance degradation or damage of the components, thereby prolonging the service life of the rotor; the aluminum alloy material has good corrosion resistance, can adapt to various working environments, reduce the erosion of the shaft sleeve caused by oxidation, moisture and other factors, ensure the long-term stability of the close fit between the shaft sleeve and the magnet and the shaft, and maintain the reliability and stability of the rotor structure, providing protection for the continuous and stable operation of the equipment.

[0013] Optionally, the shaft sleeve is annular.

[0014] By adopting the above technical scheme, the annular shaft sleeve structure makes the shaft sleeve uniformly surround the shaft and the magnet, provides omnidirectional support and buffering for the magnet during high-speed rotation of the rotor, effectively disperses the stress generated by the centrifugal force and electromagnetic force of the magnet, avoids stress concentration in local areas, thereby reducing the risk of magnet cracking or deformation, ensures the stability and integrity of the magnet, maintains the uniformity and stability of the magnetic field, and further ensures the efficiency and reliability of the electromagnetic interaction between the rotor and the external stator, ensures stable power output and good performance of the motor and other equipment. At the same time, the structural symmetry of the annular shaft sleeve is conducive to the dynamic balance adjustment of the rotor, reduces the vibration and noise of the rotor during rotation, further improves the smoothness and comfort of the equipment operation, prolongs the overall service life of the equipment, reduces the damage and fatigue wear of other components caused by vibration, and reduces the maintenance cost and failure rate of the equipment.

[0015] Optionally, the shaft sleeve is provided with a glue storage groove.

[0016] By adopting the above technical scheme, in the assembly process, the glue storage groove provides a precise accommodation space for the glue, and after the glue is filled therein, the adhesion between the shaft sleeve and the magnet is greatly enhanced, effectively preventing displacement or loosening of the shaft sleeve under long-term operation and complex working conditions, further stabilizing the overall structure of the rotor. The improvement of adhesion, especially in high-speed, frequent start-stop and severe vibration application scenarios, can effectively ensure the relative position stability of the magnet and the shaft sleeve, avoid safety hazards and performance degradation problems caused by component loosening. At the same time, by controlling the distribution of glue in the glue storage groove, the force transmission path can be optimized, reducing component wear caused by local stress concentration and prolonging the service life of the shaft sleeve, magnet and shaft, thereby reducing equipment maintenance frequency and cost, improving equipment reliability and stability, ensuring that the motor and other equipment can operate continuously and efficiently, improving overall work efficiency and economic benefits.

[0017] Optionally, the glue storage groove is arranged along the circumferential direction of the shaft sleeve, and the glue storage groove is in a ring groove structure.

[0018] By adopting the above technical scheme, when the glue storage groove is arranged along the circumferential direction of the shaft sleeve and in a ring groove structure, it forms a continuous and closed glue accommodation area in the circumferential direction. This allows the glue to be evenly distributed on the shaft sleeve ring contact surface, ensuring consistent and strong adhesion at all angles, effectively preventing relative rotation or sliding between the shaft sleeve and the magnet in the circumferential direction, and greatly enhancing the circumferential stability of the rotor structure. Especially under the action of centrifugal force generated by high-speed rotation of the rotor, the ring-shaped glue storage groove structure can better resist the circumferential shear force, maintain the close fit between the components, and ensure that the magnet rotates stably with the shaft, thereby ensuring the smoothness and reliability of the motor and other equipment during operation, reducing problems such as uneven magnetic field, power output fluctuation and component wear caused by circumferential displacement, prolonging the service life of the equipment, improving its working performance and efficiency, reducing maintenance costs and downtime losses caused by equipment failure, and improving overall economic benefits and competitiveness.

[0019] Optionally, the shaft sleeve is provided with a plurality of shaft sleeves.

[0020] By adopting the above technical solutions, the plurality of shaft sleeves can share the force between the magnet and the shaft center, making the stress distribution more uniform, effectively reducing the pressure borne by a single component, reducing problems such as shaft sleeve wear, deformation, and magnet rupture caused by local stress concentration, thereby prolonging the service life of the entire rotor structure. At the same time, the cooperative work of the plurality of shaft sleeves can enhance the support stability of the magnet, better maintain the positional accuracy of the magnet under high-speed rotation of the rotor and complex working conditions, ensure the uniformity of the air gap between the magnet and the external stator, and thus guarantee the stability and efficiency of electromagnetic interaction, improve the power output performance and operation reliability of the motor and other equipment. In addition, during production and manufacturing, the number and specifications of the shaft sleeves can be flexibly selected according to actual needs, optimizing the design of the rotor structure, improving the adaptability and flexibility of production, reducing production costs, and meeting the diversified requirements for rotor performance in different application scenarios, providing a more optimal solution for the wide application of the rotor in various industrial equipment, and enhancing the market competitiveness and practicality of the product.

[0021] Optionally, the number of shaft sleeves is one, and the length of the shaft sleeve is equal to the length of the magnet in the axial direction of the shaft center.

[0022] By adopting the above technical solutions, the equal-length shaft sleeve can provide continuous and uniform support and buffering for the magnet in the entire axial range, effectively avoiding displacement or tilting of the magnet in the axial direction due to uneven stress, ensuring the relative position stability between the magnet and the shaft center, and maintaining good coaxiality, thereby guaranteeing the dynamic balance performance of the rotor during rotation, reducing vibration and noise, and improving the smoothness and reliability of equipment operation. The shaft sleeve that completely covers the axial length of the magnet can maximize the dispersion of axial stress between the magnet and the shaft center due to factors such as friction and electromagnetic force, prevent stress concentration in local areas, reduce the risk of damage to the shaft sleeve and magnet due to long-term stress, prolong the service life of the components, and reduce the maintenance frequency and cost of the equipment. The simple structure design ensures performance while simplifying the production process and assembly process, reducing the complexity and cost of the manufacturing process, improving production efficiency, and facilitating mass production and widespread application of the product.

[0023] Optionally, the number of shaft sleeves is two, and the two shaft sleeves are sleeved on the shaft center and symmetrically distributed in the axial direction of the shaft center.

[0024] By adopting the above technical scheme, the two axially symmetrical shaft sleeves can more evenly share the radial force exerted by the magnet on the shaft center and the centrifugal force generated by rotation, avoiding uneven force leading to shaft center eccentric wear and local excessive wear of the shaft sleeve, effectively improving the rotation stability and reliability of the entire rotor structure, making the power output of the motor and other equipment more stable during operation. At the same time, the synergistic effect of the two shaft sleeves enhances the support effect of the magnet, better limiting the displacement of the magnet in the axial direction, ensuring that the magnet always maintains accurate position under high-speed rotation and complex working conditions, maintaining stable air gap, ensuring the efficiency and consistency of electromagnetic interaction with the external stator, which helps to improve the working efficiency and performance of the equipment. In addition, the symmetrical structure design is beneficial to optimize the dynamic balance characteristics of the rotor, reduce unnecessary vibration and noise, reduce the adverse effects on other parts of the equipment, prolong the overall service life of the equipment, and facilitate assembly and debugging during production and manufacturing, improving production efficiency and controllability of product quality.

[0025] In summary, the present application at least contains the following one beneficial effect:

[0026] 1. By setting a closely fitted shaft sleeve between the magnet and the shaft center, the connection stability of the magnet and the shaft center is enhanced, effectively solving the problem of magnet easy to fall off in the prior art, improving the reliability and safety of the rotor structure, ensuring long-term stable operation of the equipment, reducing the risk of safety accidents, reducing downtime and maintenance costs caused by faults, and providing stable power support for industrial production.

[0027] 2. The shaft sleeve is made of aluminum alloy material, which reduces the overall weight of the rotor, reduces the rotational inertia, makes the equipment start and stop and speed change more sensitive and efficient, and reduces energy consumption; good thermal conductivity can quickly dissipate friction heat, avoid performance degradation or damage of parts, and prolong the service life; corrosion resistance adapts to various working environments, maintains the close fit of the shaft sleeve and other parts, and ensures the stability and reliability of the rotor structure.

[0028] 3. The shaft sleeve is provided with a glue storage groove, especially a ring-shaped glue storage groove structure along the circumferential direction, which enhances the bonding force between the shaft sleeve and the magnet, effectively prevents displacement or loosening, optimizes the force transmission path, reduces wear caused by local stress concentration, and prolongs the service life of the parts; precise glue storage groove design optimizes the amount of glue used and the bonding effect, improves production and assembly efficiency and quality, reduces scrap rate and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of a rotor structure;

[0030] Figure 2 is a sectional view of a rotor structure;

[0031] Figure 3is a sectional view of a rotor structure in Example 2.

[0032] Reference signs

[0033] 1, magnet; 2, shaft center; 3, shaft sleeve; 4, glue storage groove. DETAILED DESCRIPTION

[0034] The application will be further described in detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] In this embodiment, with reference to Figures 1-2 A rotor structure includes a magnet 1, a shaft center 2, and a shaft sleeve 3. The magnet 1 is annular and is magnetized in the radial direction, and the central part is hollow to form a central passage; the shaft center 2 is arranged in the central passage; the shaft sleeve 3 is arranged between the magnet 1 and the shaft center 2, the inner surface of the shaft sleeve 3 is tightly fitted with the outer surface of the shaft center 2, and the outer surface of the shaft sleeve 3 is tightly fitted with the inner surface of the magnet 1. Through this structural design, the combination strength between the magnet 1 and the shaft center 2 is improved, and the long-term stable operation effect is ensured.

[0037] Specifically, the magnet 1 includes multiple components. For example, the magnet 1 can be made of high-performance neodymium iron boron permanent magnet material, which has the characteristics of high residual magnetism and high coercive force, and can effectively improve the magnetic field strength of the rotor. Another optional material is a samarium-cobalt permanent magnet, which has better high-temperature resistance, although the cost is higher, and is suitable for use in high-temperature environments. The inner surface of the magnet 1 is precisely machined to ensure perfect fitting with the outer surface of the shaft sleeve 3, thereby increasing the contact area and friction, and enhancing the connection stability.

[0038] The shaft center 2 is the core component supporting the entire rotor, and needs to have sufficient rigidity and fatigue resistance. High-strength stainless steel or alloy steel materials are usually selected to make the shaft center 2, both of which have good mechanical properties and wear resistance. In order to further increase the durability of the shaft center 2, a plating treatment such as chrome plating or nickel plating can be performed on the outer surface thereof, which not only improves the surface hardness but also prevents corrosion. The outer surface of the shaft center 2 also needs to be finely polished to be smooth and flat, so as to be tightly fitted with the inner surface of the shaft sleeve 3.

[0039] The shaft sleeve 3 is located between the magnet 1 and the shaft center 2, and plays a key intermediate connecting role. The shaft sleeve 3 can be made of aluminum alloy material, which is light in weight and has good thermal conductivity, helping to dissipate heat and reduce the overall weight. In addition, copper alloy can also be selected as the material of the shaft sleeve 3, which has better electrical conductivity and thermal conductivity, and is particularly suitable for high-frequency rotating occasions. The inner and outer surfaces of the shaft sleeve 3 need to be precisely machined to ensure that the contact surfaces with the shaft center 2 and the magnet 1 are flat and flawless, thereby achieving the best fitting effect.

[0040] Specifically, the outer surface of the bushing 3 and the inner surface of the magnet 1 can be tightly fitted together through an interference fit. The selection of the interference fit needs to be determined according to the actual working conditions, and it is generally recommended to control it within the range of 0.01-0.05mm, which can ensure the connection strength without causing assembly difficulties. In addition, several small protrusions can be designed on the inner surface of the bushing 3. These protrusions can generate slight vibrations during the rotation of the shaft 2, which helps to release internal stress and prevent deformation problems caused by long-term operation.

[0041] In some cases, to further improve connection reliability, a glue reservoir 4 can be provided on the bushing 3. The glue reservoir 4 is arranged along the circumference of the bushing 3 and has an annular groove structure. The function of the glue reservoir 4 is to inject an appropriate amount of adhesive during assembly, so that a stronger chemical bond is formed between the magnet 1 and the bushing 3. Commonly used adhesives include epoxy resin and polyurethane. These materials have high bonding strength and good temperature resistance, which can effectively prevent the magnet 1 from loosening during high-speed rotation.

[0042] The specific implementation principle is as follows: First, place the pre-prepared magnet 1 and shaft 2 on a dedicated assembly tool, and then pre-install the bushing 3 onto the shaft 2. Next, through precise measurement and adjustment, ensure that the inner and outer surfaces of the bushing 3 are fully fitted with the shaft 2 and magnet 1, respectively. If an adhesive reservoir 4 is provided, inject an appropriate amount of adhesive in this step, ensuring even distribution. Finally, use professional clamping equipment to press all components together, ensuring a tight fit between all contact surfaces. The entire assembly process must strictly adhere to operating procedures to avoid any factors that may affect the connection quality.

[0043] The main advantage of this embodiment lies in its multi-layered structural design and technical means, which significantly improves the bonding strength between magnet 1 and shaft 2, reducing the risk of loosening and detachment. Especially under high-speed rotation and high-temperature environments, this rotor structure exhibits excellent stability and reliability, greatly enhancing the overall performance and service life of the equipment. Furthermore, the rational material selection and detailed optimization make this rotor structure both economical and capable of meeting diverse needs, thus possessing high practical value.

[0044] Example 2

[0045] Reference Figure 3 The difference between this embodiment and the previous embodiment lies in the optimized number and layout of the bushings 3. Specifically, there are two bushings 3, which are fitted onto the shaft 2 and symmetrically distributed along the axial direction of the shaft 2. This design not only disperses the pressure on the shaft 2 but also further improves the balance and stability of the overall structure.

[0046] Specifically, each bushing 3 can also be made of aluminum alloy or copper alloy, but considering that the design of double bushings 3 will increase the overall weight, aluminum alloy is recommended as the preferred material. The inner and outer surfaces of the bushings 3 still need to be precision machined to ensure a good fit with the shaft 2 and the magnet 1. Due to the increased number of bushings 3, the length of each bushing 3 can be appropriately shortened according to the actual situation, but a certain overlap area still needs to be maintained to ensure the reliability and sealing of the connection.

[0047] The installation position of the bushings 3 also has specific requirements. Ideally, the two bushings 3 should be as close as possible to both ends of the magnet 1 to maximize their supporting effect. At the same time, the distance between the two bushings 3 should not be too large to avoid uneven stress in the central area. In practical applications, the influence of different layout schemes can be simulated using finite element analysis software to ultimately select the optimal solution.

[0048] In addition, to prevent resonance during high-speed rotation of the bushing 3, a layer of damping material can be added to its outer surface. Common damping materials include rubber and polyurethane foam, which can absorb vibration energy and reduce noise and wear. The thickness and hardness of the damping material can be flexibly adjusted according to the specific application scenario to achieve the best vibration reduction effect.

[0049] The specific implementation principle is as follows: First, fix the shaft 2 on the assembly table, and then pre-install two bushings 3 on the shaft 2 in sequence, ensuring that they are symmetrically distributed axially. Next, insert the magnet 1 into the shaft 2 and press it into the predetermined position using a clamping device. If an adhesive reservoir 4 is provided, an appropriate amount of adhesive can be injected into the bushing 3 before the clamping operation. The entire assembly process requires careful operation to ensure accurate alignment and tight connection of all components.

[0050] The advantage of this embodiment lies in the significant improvement in the overall performance of the rotor structure through the optimization of the number and layout of the bushings 3. Especially for high-power, high-load applications, the double bushing 3 design can better withstand external shocks and vibrations, extending equipment lifespan. Furthermore, the rational selection of materials and the application of additional measures (such as damping materials) make this rotor structure outstanding in noise control and energy saving, demonstrating broad application prospects.

[0051] Example 3

[0052] The difference between this embodiment and the previous embodiment is that there is only one bushing 3, and its length is equal to the length of the magnet 1 in the axial direction of the shaft 2. This design simplifies the structure, reduces the number of parts, and helps to reduce costs and improve assembly efficiency.

[0053] Specifically, the individual bushing 3 can also be made of aluminum alloy or copper alloy, depending on the actual application requirements. The inner and outer surfaces of the bushing 3 still need to be precision machined to ensure a good fit with the shaft 2 and the magnet 1. The length of the bushing 3 is equal to the length of the magnet 1 in the axial direction of the shaft 2, which can maximize coverage of the entire inner surface of the magnet 1, providing better support and connection.

[0054] The specific implementation principle is as follows: First, fix the shaft 2 on the assembly table, and then pre-install a single bushing 3 on the shaft 2, ensuring that it completely covers the inner surface of the magnet 1 axially. Next, insert the magnet 1 into the shaft 2 and press it into the predetermined position using a clamping device. If an adhesive reservoir 4 is provided, an appropriate amount of adhesive can be injected into the bushing 3 before the clamping operation. The entire assembly process requires careful operation to ensure accurate alignment and tight connection of all components.

[0055] The advantage of this embodiment lies in its simplified structure and reduced number of parts, which lowers manufacturing costs and assembly difficulty while maintaining good connection strength and stability. This design is particularly suitable for small- to medium-scale production and low-cost applications, offering high economic benefits and market competitiveness.

[0056] Example 4

[0057] The difference between this embodiment and the previous embodiment is that the bushing 3 is provided with a glue storage groove 4, which is arranged along the circumference of the bushing 3 and has an annular groove structure. The function of the glue storage groove 4 is to inject an appropriate amount of adhesive during the assembly process, so that a stronger chemical bond is formed between the magnet 1 and the bushing 3.

[0058] Specifically, commonly used adhesives include epoxy resin and polyurethane. These materials have high bonding strength and good temperature resistance, which can effectively prevent magnet 1 from loosening when rotating at high speed.

[0059] The specific implementation principle is as follows: First, the bushing 3 with the glue reservoir 4 is pre-installed on the shaft 2 to ensure the correct alignment of all components. Then, the magnet 1 is inserted into the shaft 2 and pressed into the predetermined position using a clamping device. An appropriate amount of adhesive is injected into the glue reservoir 4 of the bushing 3, and then the clamping operation is performed. The entire assembly process requires careful operation to ensure accurate alignment and tight connection of all components.

[0060] The advantage of this embodiment is that by setting up the adhesive storage tank 4 and injecting adhesive, the connection strength between the magnet 1 and the bushing 3 is greatly enhanced, improving the stability and reliability of the rotor structure. Especially in harsh working environments, this design can effectively prevent the magnet 1 from loosening and falling off, extending the service life of the equipment.

[0061] 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. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotor structure, characterized in that, include: A magnet (1), wherein the magnet (1) is annular and radially magnetized, and the central part is hollow to form a central channel; A central axis (2) is inserted through the central channel; A bushing (3) is disposed between the magnet (1) and the shaft (2). The inner surface of the bushing (3) is in close contact with the outer surface of the shaft (2), and the outer surface of the bushing (3) is in close contact with the inner surface of the magnet (1).

2. The rotor structure according to claim 1, characterized in that, The bushing (3) is made of aluminum alloy.

3. The rotor structure according to claim 1, characterized in that, The bushing (3) is annular.

4. A rotor structure according to claim 3, characterized in that, The bushing (3) is provided with a glue storage groove (4).

5. A rotor structure according to claim 4, characterized in that, The glue storage tank (4) is arranged along the circumferential direction of the bushing (3), and the glue storage tank (4) is an annular groove structure.

6. A rotor structure according to claim 1, characterized in that, The bushing (3) is provided in several parts.

7. A rotor structure according to claim 6, characterized in that, The number of bushings (3) is one, and the length of the bushing (3) is the same as the length of the magnet (1) in the axial direction of the axis (2).

8. A rotor structure according to claim 6, characterized in that, The number of bushings (3) is two, and the two bushings (3) are fitted on the shaft (2) and are symmetrically distributed in the axial direction of the shaft (2).

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