Motor rotor core and manufacturing method thereof

Abstract

The invention discloses a motor rotor core and a manufacturing method thereof, and belongs to the technical field of motor design and manufacturing. The rotor iron core comprises an iron core main body formed by laminating a plurality of punching sheets, and self-adhesive sheet end plates and arc-shaped pressing rings which are arranged at the two ends of the iron core main body. The self-adhesive sheet end plate is formed into a whole by heating, pressurizing and curing a self-adhesive sheet coated with epoxy resin or acrylic resin; the arc-shaped pressing ring is provided with a cambered surface structure, so that synchronous pressing in the axial direction and the radial direction can be achieved. And the iron core main body adopts a transposition lamination process, so that burrs of the punching sheet are uniformly distributed. Through chemical bonding of the end plates of the self-adhesive sheets, mechanical wedge-caulking of the arc-shaped pressing rings and error homogenization of transposition lamination, and through combination with the double-end tensioning screw subjected to insulation treatment, the problems that a traditional rotor iron core end punching sheet is prone to loosening, stress concentration and large eddy-current loss are caused by burrs, dynamic balance precision is poor and the like are effectively solved, and the service life of the rotor iron core end punching sheet is prolonged. And the structural rigidity, the operation stability and the motor efficiency of the rotor iron core are obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of motor design and manufacturing technology, specifically relating to a motor rotor core and its manufacturing method. Background Technology

[0002] Permanent magnet motors, due to their high power density, high efficiency, and excellent control performance, have been widely used in industrial automation, new energy vehicles, home appliances, and wind power generation. The performance of a motor largely depends on the manufacturing quality of its core component—the rotor core. An ideal rotor core should possess high geometric precision, uniform structural strength, good dynamic balance, and long-term operational stability. However, current manufacturing processes and structural designs for permanent magnet motor rotor cores still face a series of long-standing technical bottlenecks, severely restricting further improvements in motor performance.

[0003] 1. Burr problem in stamping and its chain of negative impacts The rotor core is made by stacking a large number of silicon steel laminations. During the lamination manufacturing process, due to the inherent clearance of the blanking dies and plastic deformation, microscopic burrs inevitably form on the edges of the laminations. While these burrs are unavoidable, they can cause serious cascading problems during the stacking process: Stress concentration and vibration noise: During the stacking of laminations with burrs, the burrs disrupt the ideal planar contact between the laminations, leading to microscopic gaps and uneven stress distribution inside the core. When the motor is running, alternating electromagnetic forces act on this core with internal stress concentration, easily triggering localized magnetostrictive vibrations and mechanical vibrations, thus generating significant electromagnetic and mechanical noise and affecting the motor's acoustic quality.

[0004] Eddy current loss: Burrs cause electrical short circuits between adjacent laminations. These short circuits greatly increase the rotor's eddy current losses, leading to localized heating of the core, reduced efficiency, and in severe cases, even thermal degradation, affecting the motor's output and service life.

[0005] Balance deterioration: The distribution of burrs is random and uneven. Their cumulative effect in the circumferential direction of the iron core will lead to uneven distribution of rotor mass, increase the initial imbalance, and put forward higher requirements for rotor dynamic balance.

[0006] 2. Problem of loose end laminations As market demands for motor power density continue to increase, the volume and weight of permanent magnets used inside the rotor are correspondingly increasing. The enormous centrifugal force generated during high-speed rotation poses a severe challenge to the integrity of the iron core. Against this backdrop, the traditional iron core clamping structure reveals significant shortcomings: Insufficient and uneven clamping force: When applying axial clamping force, the contact pressure distribution between the end face and the lamination of a traditional flat clamping ring is uneven, often with high pressure in the center and low pressure at the edges. This structure makes it difficult to form a continuous, uniform and sufficient clamping force on the outermost lamination of the iron core.

[0007] High loosening rate and structural risks: Under the long-term start-stop, speed change, and high-speed operation conditions of the motor, the laminations at both ends of the iron core are most prone to loosening under the repeated impact of centrifugal force and electromagnetic force. According to statistics, under traditional structural and lamination process conditions, the loosening rate of the laminations at both ends of the iron core is as high as 50%. This loosening not only undermines the overall structural rigidity of the rotor, leading to a decrease in modal frequency, but also generates a "slapping" effect during operation, further aggravating vibration and noise, and may cause further deterioration of electromagnetic performance, seriously threatening the reliability and service life of the motor.

[0008] In summary, the core challenges currently facing permanent magnet motor rotor core manufacturing technology are: first, uneven internal stress, damage, and efficiency reduction caused by lamination burrs; and second, high lamination loosening rate and structural instability due to insufficient clamping force of traditional pressure rings. These problems are intertwined, collectively limiting the development of permanent magnet motors towards higher power density, higher efficiency, lower noise, and higher reliability, while also increasing product maintenance costs and energy consumption over the entire product lifecycle.

[0009] Therefore, there is an urgent need in this field for an innovative rotor core structure design and lamination process that can fundamentally improve the stress distribution between laminations, effectively control burr hazards, and provide a long-term, stable, and uniform end clamping mechanism to significantly improve the overall quality and operating performance of the rotor core. Summary of the Invention

[0010] This invention proposes a motor rotor core and its manufacturing method, which solves the problem of internal quality defects in the core caused by lamination burrs; the problem of high loosening rate of end laminations in the rotor core under traditional structure; and the problem that existing technologies cannot achieve both high power density and high structural stability.

[0011] The core technical solution of this invention lies in: the "repositioning and cyclic stacking" process; the "self-adhesive sheet-arc pressure ring" end double locking structure; the verticality and concentricity control system based on high-precision tooling; the "insulated" double-head tensioning screw system; and the torque transmission structure combining heat sleeve and arc key.

[0012] The specific solution of the present invention is as follows: An electric motor rotor core includes a motor shaft, a core body made of laminations, self-adhesive end plates and arc-shaped pressure rings stacked sequentially at both ends of the core body, the arc-shaped pressure rings having an arc surface on the side near the self-adhesive end plates, and the core body and the self-adhesive end plates and arc-shaped pressure rings at both ends being fastened by double-ended tension screws.

[0013] Furthermore, the lamination includes four zones, each zone being provided with a magnetic groove and a positioning hole for inserting the double-headed tensioning screw.

[0014] Furthermore, the self-adhesive end plate is composed of a self-adhesive sheet, which includes an epoxy resin or acrylic resin coating.

[0015] Furthermore, it includes an arc key, which is welded to the motor shaft to fix the rotor core to the motor shaft.

[0016] Furthermore, the double-ended tensioning screw includes an insulating tube and an insulating washer, wherein the insulating tube is an epoxy glass cloth tube.

[0017] A method for manufacturing an electric motor rotor core, comprising: S1 stamping; S2 self-adhesive endplate fabrication; S3 rotor core transposition and stacking; S4 lamination stacking fixture locking and locking fixture installation; S5 uses a platform sleeve shaft; S6 is equipped with a double-ended tensioning screw.

[0018] Furthermore, the fabrication of the S2 self-adhesive endplate includes: Position the self-adhesive sheet using a self-adhesive sheet stacking fixture; The assembled self-adhesive sheet, along with the self-adhesive sheet stacking fixture, is placed in an oven for heating and curing to form the self-adhesive sheet end plate.

[0019] Furthermore, the S3 rotor core transposition and stacking includes: Calibrate the positioning blocks of the lamination stacking fixture; After stacking N pieces, rotate by an angle θ and repeat the stacking process. Stacking height is measured, and preliminary pre-compression is performed. Pre-compression pressure: stamping area × 20 kg / cm² 2 .

[0020] Furthermore, the S4 lamination stacking fixture locking and locking fixture installation includes: The rotor core with laminations is pressed by a press using a lamination stacking fixture. The lamination stacking fixture and the locking fixture are locked in sequence.

[0021] Furthermore, the S5 uses a platform sleeve shaft including: The stacked rotor core, along with the tooling, is placed in an oven for heating at 160℃ for 6-8 hours. The heated rotor core is placed on a platform for shaft fitting; Welded arc keys are used to fix the rotor core to the motor shaft.

[0022] The present invention has the following beneficial effects: 1. Improved the structural rigidity and end stability of the rotor core. This invention constructs a multi-dimensional locking system through a triple fixing mechanism of "self-adhesive sheet chemical bonding", "arc-shaped pressure ring mechanical wedge tightening" and "insulating screw axial tensioning".

[0023] The self-adhesive endplate is cured by heating to form a whole, eliminating the possibility of individual endplates becoming loose from a chemical perspective.

[0024] With its unique arc-shaped pressure ring, the arc-shaped pressure ring generates a radial inward component force when axial clamping force is applied, achieving synchronous and efficient clamping of axial and radial forces. Its clamping force is far superior to that of traditional flat pressure rings, and the clamping effect is more uniform and longer-lasting.

[0025] The double-ended tensioning screw runs through the entire structure, providing a constant and powerful axial clamping force.

[0026] The combined effect of these three mechanisms ensures that the rotor core, especially at the most stressed end, maintains extremely high integrity and structural stability under extreme conditions such as high speed and high temperature, fundamentally solving the industry problem of high loosening rate of traditional rotor end laminations.

[0027] 2. Improved rotor dynamic balance performance, effectively reducing vibration and noise. The "repositioning cyclic lamination" process of this invention is a "self-compensation" method for manufacturing errors. This process ensures that burrs and inherent thickness differences at the edge of the lamination are uniformly distributed along the circumferential direction of the core, avoiding the cumulative effect of errors in a single direction.

[0028] This significantly reduces the initial imbalance and internal local stress concentration of the rotor from the source. This greatly improves the inherent dynamic balance accuracy of the rotor, resulting in less vibration, significantly reduced electromagnetic and mechanical noise during operation, and improved acoustic quality and operational smoothness of the motor.

[0029] 3. Ensures extremely high assembly precision and electromagnetic performance. Through high-precision positioning fixtures and adjustment processes, the ultra-high concentricity between the outer circle of the iron core and the motor shaft is ensured, effectively reducing the axial runout of the iron core and laying a solid geometric precision foundation for the low-vibration operation of the rotor.

[0030] The composite insulation treatment of the double-ended tensioning screw blocks the axial eddy current path formed by the metal components, effectively suppresses eddy current loss, reduces core heating, and thus improves the efficiency and output performance of the motor.

[0031] In summary, this invention has comprehensively optimized multiple dimensions, including structural strength, dynamic balance, assembly precision, and electromagnetic efficiency. The rotor core exhibits high magnetic pole strength, and the magnet slots demonstrate stable forming quality. Ultimately, this results in permanent magnet motors using this rotor offering a combination of advantages: more stable operation, lower energy consumption, less vibration and noise, and lower maintenance costs. This significantly extends the motor's lifespan, making it particularly suitable for applications with extremely high reliability and performance requirements. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of rotor core assembly in one embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 This is a schematic diagram of the lamination structure in one embodiment of the present invention; Figure 4 This is a schematic diagram of an arc-shaped pressure ring structure in one embodiment of the present invention; Figure 5 This is a schematic diagram of a double-headed tensioning screw structure in one embodiment of the present invention; Figure 6 This is a schematic diagram of the self-adhesive sheet stacking tooling assembly in one embodiment of the present invention; Figure 7 This is an exploded view of a self-adhesive sheet stacking fixture in one embodiment of the present invention; Figure 8 This is a schematic diagram of the lamination stacking tooling assembly in one embodiment of the present invention; Figure 9 This is a schematic diagram of the positioning block calibration in one embodiment of the present invention; Figure 10 This is a schematic diagram of the locking fixture assembly in one embodiment of the present invention.

[0033] Figure label: 1. Stamping piece; 11. Magnet slot; 12. Positioning hole; Self-adhesive sheet 2; Arc-shaped pressure ring 3, arc surface 31; Arc key 4; Double-ended tensioning screw 5, insulating washer 51, insulating tube 52; 6. Stamping and stacking fixture, 61. First top plate, 62. First bottom plate, 63. First fastening screw, 64. Positioning block, 65. First mandrel, 66. Positioning inspection plate; Locking fixture 7, second fastening screw 71, pressure block 72; Positioning rod 8 Self-adhesive sheet stacking fixture 9, second top plate 91, second bottom plate 92, second mandrel 93, third fastening screw 94, positioning post 95. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0036] Example 1 This invention provides a motor rotor core, aiming to overcome the problem of poor stacking quality of permanent magnet motor rotor cores in existing technologies. The repositioning and stacking of laminations 1 reduces the impact of burrs on the laminations 1. The use of the arc-shaped pressure ring 3 and the insulated double-headed tensioning screw 5 increases the rotor clamping force. The use of various tooling during the stacking process effectively ensures the locking force of the rotor core, improves the rigidity of the rotor core, thereby improving the quality of the permanent magnet motor rotor core and reducing motor noise and vibration. The specific structure is as follows: Figures 1 to 5 As shown: 1. The iron core body composed of lamination 1 The permanent magnet motor rotor core of the present invention comprises a core body formed by stacking multiple laminations 1. 50W470 silicon steel sheets with a thickness of 0.5mm are selected as the material for laminations 1 and are formed by stamping. This material has the characteristics of high magnetic permeability and low iron loss, and is a core material for constructing an efficient magnetic circuit. Thinner sheets help reduce eddy current losses.

[0037] like Figure 3As shown, the lamination 1 includes four zones, each with a magnetic slot 11 for embedding permanent magnets to form the magnetic field of the rotor. In this embodiment, each zone has three magnetic slots 11. The magnetic slots 11 are used to install magnets and cooperate with the positioning rod 8 during assembly to achieve positioning calibration. The lamination 1 also includes positioning holes 12 evenly distributed along its own axial direction. The positioning holes 12 are used to install double-headed tension screws 5 to facilitate the series connection of the laminations 1.

[0038] 2. Self-adhesive end plate composed of self-adhesive sheet 2 The two ends of the iron core body are pressed with self-adhesive end plates. The self-adhesive end plates are formed by stacking self-adhesive sheets 2. The surface of the self-adhesive sheet 2 has a special adhesive material layer. In this embodiment, the self-adhesive sheet 2 is made of a special epoxy resin or acrylic resin coating applied to the surface of silicon steel sheet. After heating and under pressure, each self-adhesive sheet 2 can be firmly bonded together to form a whole, forming a self-adhesive end plate, which effectively prevents the laminations 1 at both ends of the iron core body from loosening.

[0039] 3. Arc-shaped pressure ring 3 A pair of specially designed arc-shaped pressure rings are used to press the two ends of the iron core body together. For example... Figure 4 As shown, the inner side of the arc-shaped pressure ring 3 is provided with an arc surface 31, which has a certain curvature. This structure can increase the pressure applied to the lamination 1 by the end of the arc-shaped pressure ring 3, and can effectively reduce the possibility of loosening at the end of the lamination 1. At the same time, the arc-shaped pressure ring 3 is made of a high-strength and high-toughness alloy material to ensure that it will not deform during the pressing process, can maintain a stable pressing force for a long time, improve the rigidity of the rotor, and the arc-shaped pressure ring 3 can achieve synchronous and efficient pressing in both the axial and radial directions.

[0040] 4. Arc key 4 like Figure 2 As shown, the arc key 4 is an arc-shaped strip block, and several arc keys 4 are evenly distributed around the motor shaft axis. In this embodiment, there are 6 arc keys 4. The motor shaft is provided with a keyway for installing the arc keys 4. The arc keys 4 are welded to fix the rotor core and the motor shaft.

[0041] 5. Double-ended tensioning screw 5 The double-headed tensioning screw 5 is used to sequentially connect and lock all the stamping pieces 1, self-adhesive pieces 2, and arc-shaped pressure rings 3 according to design requirements. Figure 5 As shown, the surface of the double-ended tensioning screw 5 is covered with an insulating tube 52. In this embodiment, the insulating tube 52 is an epoxy glass cloth tube. In addition to nuts and washers, insulating washers 51 are also provided at the threaded connection points at both ends of the double-ended tensioning screw 5.

[0042] The rotor core provided by this invention has extremely high structural rigidity, resisting deformation caused by electromagnetic force and centrifugal force; excellent dynamic stability, extremely low vibration and noise; outstanding reliability and long service life, effectively preventing faults such as lamination loosening and insulation damage; reducing eddy current loss and mechanical loss, and improving motor efficiency.

[0043] Example 2 This invention also provides a method for manufacturing a rotor core, the specific steps of which are as follows: S1 stamping 1 stamping 0.5mm thick 50W470 silicon steel sheets were selected as the material for lamination 1. A feeding robot was used for blanking. High-pressure air was used to clean the surface of the silicon steel sheets before feeding them into the punch press, removing as much contaminant as possible to improve the core stacking quality and motor efficiency. A CNC punch press was used for blanking, with a die accuracy of ±0.02mm and a blanking gap controlled within 0.03mm. The first rotor lamination 1 was carefully inspected and qualified before mass production to avoid producing a batch of defective laminations that would be scrapped.

[0044] S2 self-adhesive endplate fabrication The self-adhesive sheet 2 is punched using the same process as the regular sheet 1. Punch the self-adhesive sheet 2 according to step S1. After the self-adhesive sheet 2 is punched, pay attention to the cleanliness of its surface to avoid affecting the self-adhesive effect due to dirt.

[0045] A special epoxy resin or acrylic resin coating is applied to the surface of the self-adhesive sheet 2.

[0046] A specified number of self-adhesive sheets 2 are positioned using the self-adhesive sheet stacking fixture 9, ensuring that the holes and slots of all self-adhesive sheets 2 are aligned and oriented in the same direction. For example... Figure 6 , Figure 7 As shown, the self-adhesive sheet stacking fixture 9 includes a second base plate 92, a second mandrel 93 and a positioning post 95 mounted on the second base plate 92. The self-adhesive sheets 2 are inserted through the second mandrel 93 and the positioning post 95 and stacked sequentially. After reaching a specified number, the second top plate 91 is covered and finally fastened with the third fastening screw 94.

[0047] The self-adhesive end plate is formed by heating and curing in an oven. The specific steps and parameters are as follows: Place the assembled self-adhesive sheet 2, along with the self-adhesive sheet stacking fixture 9, into the drying oven. Heating and curing are performed under set process parameters, including: Temperature: Based on the characteristics of the coating of the self-adhesive sheet 2, the heating temperature in this embodiment is set between 160° and 220°.

[0048] Pressure: Apply sufficient pressure to ensure tight contact between the self-adhesive sheet 2 and the coating. The pressure level needs to be set according to the area of ​​the self-adhesive sheet end plate and the coating characteristics. In this embodiment, 1 to 5 MPa is used.

[0049] Time: Set the pressure and heat holding time to ensure that the coating is fully fused, flows and cures. In this embodiment, the pressure and heat holding time in the oven is 6 to 8 hours.

[0050] After heating is complete, remove the self-adhesive sheet end plate with self-adhesive sheet stacking fixture 9 and allow it to cool naturally.

[0051] The cleaning process involves inspecting and removing any small amounts of residual adhesive that may have been squeezed out during the curing process.

[0052] Check the dimensions according to the drawings, and inspect the total thickness, flatness, parallelism and critical dimensions of the bonded end plate.

[0053] Visual inspection: Check the surface for defects such as dents, scratches, and damage to the coating.

[0054] S3 rotor core transposition and stacking Positioning block 64 calibration: This step uses lamination stacking fixture 6, such as... Figure 8 , Figure 9 As shown, the lamination stacking fixture 6 includes a first base plate 62, on which a plurality of positioning blocks 64 and a first mandrel 65 are mounted. In this embodiment, eight positioning blocks 64 are used at each end of the lamination stacking fixture 6. After the positioning blocks 64 are installed, the height difference needs to be checked to ensure that the height difference of the positioning blocks 64 is ≤0.05mm. The positioning inspection plate 66 is used for inspection. After the positioning blocks 64 are installed, the positioning inspection plate 66 is placed flat on top of the positioning blocks 64. The gap between the positioning blocks 64 and the positioning inspection plate 66 is checked with a feeler gauge. A gap ≤0.05mm is acceptable. If the gap is >0.05mm, adjustment is required. This can be achieved by adjusting the tightness of the fixing screws of the positioning blocks 64 and by adding a copper sheet of appropriate thickness between the positioning blocks 64 and the first base plate 62. The use and adjustment of positioning block 64 ensures the perpendicularity of the inner hole of the subsequently stacked lamination 1 to the arc-shaped pressure ring 3, effectively ensuring the concentricity between the outer circle of the rotor core after the rotor core is stacked and the motor shaft, reducing the axial and radial runout of the rotor core, and reducing the motor rotor imbalance.

[0055] Transposition and Stacking: After calibrating the positioning block 64, place the arc-shaped pressure ring 3 on top of the positioning block 64, then place the self-adhesive sheet end plate, and stack the sheets according to the drawing requirements. Following the pre-set transposition rules, stack the sheets in a cyclical manner, rotating by an angle θ after stacking N sheets. In this embodiment, a 90° rotation is performed every 10 sheets stacked to complete one transposition operation. The lamination 1 is stacked in a four-position cyclical manner from 0° to 90° to 180° to 270°, with burrs evenly distributed on the circumference. During the stacking process, the positioning rod 8 and the magnetic groove 11 are used for calibration to ensure the positional accuracy of the stacked sheets. The transposition and stacking method for lamination 1 makes the burr distribution on lamination 1 more dispersed, preventing burrs from concentrating in a certain area and affecting the stacking quality. It also eliminates thickness differences in lamination 1, thereby reducing the imbalance and local stress concentration caused by burrs on lamination 1, reducing the residual imbalance of the rotor, and improving the stability of rotor operation.

[0056] Every 50 laminations are stacked, the height of the rotor core stack is checked using a height gauge and compared to the theoretical dimensions of lamination 1. If the height deviation is ≥0.5mm, the flatness of the rotor laminations 1 is checked first. If the deformation of the rotor laminations 1 exceeds 0.03mm, they are scrapped. If the stacking fixture is misaligned, it is readjusted. If the positioning rod 8 is worn, it is replaced with a positioning rod 8 with a dimensional accuracy of ±0.015mm. When a certain height is reached, the upper press performs preliminary pre-pressing, with a pre-tightening pressure of lamination 1 area × 20kg / cm². 2 Calculations are performed to ensure the relative inter-plate pressure of lamination 1.

[0057] S4 lamination stacking fixture 6 locking and locking fixture 7 installation After all the stamping pieces 1 are stacked according to the drawing requirements, the remaining self-adhesive end plates and arc-shaped pressure rings 3 are installed on top of the stacked stamping pieces 1 in sequence. Then, the remaining 8 positioning blocks 64 are placed on the arc-shaped pressure rings 3, and the first top plate 61 is placed on the positioning blocks 64. The first top plate 61 and the first bottom plate 62 are connected by the first fastening screw 63.

[0058] The rotor core with laminations is pressed by a press on the lamination stacking fixture 6. It is confirmed that there is no looseness on the outer circle of the lamination 1. The arc-shaped pressure ring 3 is ensured to be in close contact with the self-adhesive end plate. The first fastening screw 63 is locked. A torque wrench is used to tighten the screws in two steps according to the diagonal principle, increasing the torque in two steps to avoid local stress concentration.

[0059] Install locking fixture 7, such as Figure 10 As shown, the locking fixture 7 includes several pressure blocks 72. Four pressure blocks 72 are symmetrically placed at both ends of the rotor core. In this embodiment, each pressure block 72 is placed at the junction of each section of the lamination 1. The two pressure blocks 72 at the two ends are connected by a second fastening screw 71. The second fastening screw 71 is tightened according to the torque required by the drawing to achieve the fastening of the ends of the rotor core.

[0060] S5 uses platform sleeve. Remove the first mandrel 65 and measure the inner diameter of the rotor core using a micrometer. Place the stacked rotor core, along with the tooling, into an oven for heating at 160℃ for 6-8 hours. After heating, place the rotor core on a platform for mandrel fitting. Before fitting the mandrel, use a measuring rod to measure the inner diameter of the heated rotor core to ensure that the expansion of the rotor core's inner hole meets the design requirements.

[0061] Insert the motor shaft into the rotor core, measure and fit the relevant dimensions according to the drawing requirements, and ensure the axial positioning accuracy. Weld arc key 4 to fix the rotor core and motor shaft. The welding wire material should match the material properties of the motor shaft. After welding, perform magnetic particle testing on the weld to ensure there are no cracks.

[0062] S6 Installs Double-Headed Tensioner Screw 5 After completing the shaft assembly, install the double-ended tensioning screw 5 to ensure sufficient tightness between the stacked laminations 1, the self-adhesive end plates, and the arc-shaped pressure ring 3. Pass the double-ended tensioning screw 5 through the positioning hole 12 of the lamination 1, and then install the insulating washer 51, gasket, and nut sequentially on the threaded end of the double-ended tensioning screw 5. First, tighten the nut symmetrically to 80% of the rated torque, then tighten it completely to 100% of the rated torque. Finally, check whether the insulation resistance of the double-ended tensioning screw 5 meets the requirements. This completes the rotor core assembly.

[0063] In the embodiments disclosed in this application, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this invention according to the specific circumstances.

[0064] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A motor rotor core, characterized in that, The device includes a motor shaft, a core body made of laminations, self-adhesive end plates and arc-shaped pressure rings stacked on both ends of the core body, the arc-shaped pressure rings having an arc surface on the side near the self-adhesive end plates, and the core body and the self-adhesive end plates and arc-shaped pressure rings at both ends being fastened by double-headed tension screws.

2. The motor rotor core according to claim 1, characterized in that, The lamination includes four zones, each zone having a magnetic groove and a positioning hole for inserting the double-ended tensioning screw.

3. The motor rotor core according to claim 1, characterized in that, The self-adhesive end plate is composed of a self-adhesive sheet, which includes an epoxy resin or acrylic resin coating.

4. The motor rotor core according to claim 1, characterized in that, It includes an arc key, which is welded to the motor shaft and used to fix the rotor core to the motor shaft.

5. The motor rotor core according to claim 1, characterized in that, The double-ended tensioning screw includes an insulating tube and an insulating washer, wherein the insulating tube is an epoxy glass cloth tube.

6. The method for manufacturing a motor rotor core according to any one of claims 1 to 5, characterized in that, include: S1 stamping; S2 self-adhesive endplate fabrication; S3 rotor core transposition and stacking; S4 lamination stacking fixture locking and locking fixture installation; S5 uses a platform sleeve shaft; S6 is equipped with a double-ended tensioning screw.

7. The method for manufacturing a motor rotor core according to claim 6, characterized in that, The fabrication of the S2 self-adhesive endplate includes: Position the self-adhesive sheet using a self-adhesive sheet stacking fixture; The assembled self-adhesive sheet, along with the self-adhesive sheet stacking fixture, is placed in an oven for heating and curing to form the self-adhesive sheet end plate.

8. The method for manufacturing a motor rotor core according to claim 6, characterized in that, The S3 rotor core transposition and stacking includes: Calibrate the positioning blocks of the lamination stacking fixture; After stacking N pieces, rotate by an angle θ and repeat the stacking process. Stacking height is measured, and preliminary pre-compression is performed. Pre-compression pressure: stamping area × 20 kg / cm² 2 .

9. The method for manufacturing a motor rotor core according to claim 6, characterized in that, The S4 lamination stacking fixture locking and locking fixture installation includes: The rotor core with laminations is pressed by a press using a lamination stacking fixture. The lamination stacking fixture and the locking fixture are locked in sequence.

10. The method for manufacturing a motor rotor core according to claim 6, characterized in that, The S5 platform sleeve includes: The stacked rotor core, along with the tooling, is placed in an oven for heating at 160℃ for 6-8 hours. The heated rotor core is placed on a platform for shaft fitting; Welded arc keys are used to fix the rotor core to the motor shaft.

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