A high-efficiency motor core stacking device

Abstract

This invention discloses a high-efficiency motor core stacking device, comprising: a base, a bracket fixedly mounted on the top of the base, a top plate fixedly mounted on the top of the bracket, a cylinder mounted on the top of the top plate, a punch structure mounted on the output shaft of the cylinder, a stepper motor mounted at the center of the inner wall of the base, a rotating shaft mounted on the output shaft of the stepper motor, and the rotating shaft being rotatably mounted to the base via bearings; and a stamping plate rotatably mounted on the top of the base, with a groove formed at the bottom of the stamping plate, the inner wall of the groove being fixedly mounted to the top of the rotating shaft. This device utilizes three core technologies: electromagnetic-mechanical composite drive, multi-stage buffer structure, and precision rotary positioning. It achieves high positioning repeatability, and the controllable damping characteristics of the magnetorheological fluid damper, combined with the closed-loop control formed by the pressure sensing feedback system, significantly improves the consistency of the stacked core quality. It also facilitates electromagnetic limiting and electromagnetic stripping of the motor core, resulting in good performance and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of core stacking technology for drive motors in new energy vehicles, and in particular to a high-efficiency core stacking device for motors. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source (or use conventional vehicle fuels but adopt new on-board power devices), integrating advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles, new technologies, and new structures. The production and processing of new energy vehicles requires the use of electric motors. Non-oriented silicon steel is used as the material for preparing the motor core. In the application process, it mainly undergoes processing steps such as slitting, stamping, welding, riveting, and stacking. The related processing steps are prone to generating stress that degrades the electromagnetic properties of silicon steel materials, thereby affecting the performance of the motor.

[0003] Authorization Announcement No. CN114069986B discloses a high-efficiency compressor motor core processing method, belonging to the field of full-process non-oriented silicon steel application. This invention uses non-oriented silicon steel coils, sequentially performing slitting, stamping, riveting, core heat treatment, and stacking processes. In the stamping process, the gap between the punch and die is set to d = (10%~15%)H, where d is the gap between the punch and die and H is the thickness of the non-oriented silicon steel. This invention addresses the current insufficient efficiency of compressor motor core applications by using appropriate processing methods to produce compressor motor cores with high dimensional accuracy, high production efficiency, no sticking after heat treatment, and improved core efficiency. After subsequent conventional processes such as winding and assembly, the final compressor motor efficiency meets the requirements for high efficiency.

[0004] Existing hydraulic stacking equipment suffers from large pressure fluctuations: the inertia of the hydraulic system causes pressure overshoot (typical fluctuation ±8%), resulting in microscopic deformation of silicon steel sheets and making it inconvenient to quickly unload the stacked motor core. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a high-efficiency motor core stacking device. The existing hydraulic stacking device has large stacking pressure fluctuations: the inertia of the hydraulic system causes pressure overshoot (typical fluctuation ±8%), resulting in microscopic deformation of silicon steel sheets and inconvenience in quickly unloading the stacked motor cores.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A high-efficiency motor core stacking device, comprising:

[0008] The base has a bracket fixedly installed on its top, a top plate fixedly installed on the top of the bracket, a cylinder installed on the top of the top plate, and a punch structure installed on the output shaft of the cylinder.

[0009] A stepper motor is installed at the center of the inner wall of the base. A rotating shaft is installed on the output shaft of the stepper motor, and the rotating shaft is rotatably mounted to the base via bearings.

[0010] The stamping plate is rotatably mounted on the top of the base. A groove is provided on the bottom of the stamping plate. The inner wall of the groove is fixedly installed with the top of the rotating shaft. Two stamping slots are symmetrically opened on the top of the stamping plate. Two limiting plate structures are symmetrically arranged in the two stamping slots. A stripping structure is provided in both stamping slots. The stripping structure is located between the corresponding two limiting plate structures.

[0011] The first electromagnet and two second electromagnets are all mounted on the top of the base. The two ejector structures are adapted to the first electromagnet. The bottom magnetic poles of the two ejector structures are opposite to the top magnetic poles of the first electromagnet. The four limiting plate structures are adapted to the two second electromagnets. The outer magnetic poles of the four limiting plate structures are opposite to the inner magnetic poles of the two second electromagnets.

[0012] Preferably, a controller is installed on the top of the base, a power switch and an emergency stop switch are installed on the side of the base, and a bottom cover is installed on the bottom of the base.

[0013] Preferably, two rectangular sliding holes are symmetrically formed on the bottom inner wall of the stamping groove, and the two limiting plate structures are adapted to the two rectangular sliding holes.

[0014] Preferably, the limiting plate structure includes an arc-shaped limiting plate located inside the stamping groove. A rectangular slide rod is fixedly installed at the bottom of the arc-shaped limiting plate, and a second permanent magnet is fixedly installed on the outer side of the rectangular slide rod. The second permanent magnet is adapted to a second electromagnet, and the magnetic poles of the two permanent magnets and the second electromagnets are opposite on the side that are close to each other. The two second electromagnets generate magnetism to push the two second permanent magnets closer to each other, and the two second permanent magnets drive the two rectangular slide rods closer to each other.

[0015] Preferably, four support blocks are fixedly installed on the bottom inner wall of the groove. The four support blocks are arranged symmetrically in pairs. A limiting rod is fixedly installed between two support blocks. A limiting hole is opened on the rectangular slide rod. The limiting hole is slidably connected to the outer side of the limiting rod. A reset spring is fixedly installed between the rectangular slide rod and the support block. The reset spring is sleeved on the outer side of the limiting rod. The second permanent magnet is moved away from the second electromagnet. Through the pulling force of the reset spring, the two arc-shaped limiting plates move away from each other, releasing the limitation on the motor core.

[0016] Preferably, the stripping structure includes a stripping plate, and a stripping receiving groove is formed on the bottom inner wall of the stamping groove. The stripping plate and the stripping receiving groove are seamlessly slidably connected. Two round rods are fixedly installed at the bottom of the stripping plate, and the same insulating plate is fixedly installed at the bottom of the two round rods. A first permanent magnet is fixedly installed at the bottom of the insulating plate. The first permanent magnet is adapted to a first electromagnet, and the magnetic poles of the first permanent magnet and the first electromagnet are opposite on the side that are close to each other. The first electromagnet generates magnetism to push the first permanent magnet to move upward. The first permanent magnet pushes the insulating plate to move upward. The insulating plate, through the two round rods and the stripping plate, pushes the motor core to move upward and extends to the top of the stamping groove, which can facilitate the removal and replacement of the motor core.

[0017] Preferably, two circular holes are formed on the bottom inner wall of the unloading receiving tank, and the circular rod is slidably connected to the inner wall of the circular hole. Two return springs are fixedly installed between the top of the insulating plate and the inner wall, and the two return springs are sleeved on the outside of the two circular rods.

[0018] Preferably, the bottom edge of the stamping plate is embedded with multiple balls, and the multiple balls are slidably connected to the top of the base.

[0019] Preferably, the punch structure includes a fixing plate, the top of which is fixedly installed with the output shaft of the cylinder, a pressure sensing plate is installed at the bottom of the fixing plate, a pressure sensor is provided between the fixing plate and the pressure sensing plate, and a sensing wire is connected to the pressure sensor.

[0020] Preferably, a plurality of magnetorheological fluid dampers are installed at the bottom of the pressure sensing plate, and the same damping plate is installed at the bottom end of the plurality of magnetorheological fluid dampers. A plurality of guide rods are slidably installed on the outer side of the damping plate, and the same mounting plate is installed at the bottom end of the plurality of guide rods. A plurality of helical springs are installed between the mounting plate and the damping plate, and the helical springs are sleeved on the outer side of the corresponding guide rods. The same stamping head is installed at the bottom of the mounting plate by bolts.

[0021] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0022] 1. Composite drive technology achieves a leapfrog improvement in production efficiency and optimizes rotary positioning efficiency: The stepper motor and ball bearing are used in synergistic drive to achieve a 90° station switching time of ≤0.5 seconds for the stamping plate, which is 42% faster than the traditional hydraulic drive solution. The dual-station parallel operation mode improves the effective working time utilization rate.

[0023] 2. Breakthrough in electromagnetic-mechanical linkage response: The clamping mechanism has a response time of 15ms (traditional mechanical clamps > 200ms), adapting to the stacking requirements of 0.1-1.5mm silicon steel sheets. The material removal and lifting system has a stroke of 15mm and a completion cycle of < 0.8 seconds, which is 3 times more efficient than pneumatic demolding. It facilitates electromagnetic limiting of the motor core and electromagnetic material removal, resulting in good performance and high efficiency.

[0024] 3. Multi-level buffer system ensures precision machining quality and dynamic stamping stability control: The composite buffer structure of magnetorheological fluid damper (damping force 3000N) and gradient spring controls the stamping pressure fluctuation within ±2%. The pressure sensing feedback system (1kHz sampling rate) realizes adaptive adjustment of stamping pressure from 0.5-50kN, the stamping stroke error compensation accuracy is ±5μm, the interlayer burr occurrence rate is reduced to below 0.3%, and the stacking pressure fluctuation is small.

[0025] This invention utilizes three core technologies: electromagnetic-mechanical composite drive, multi-level buffer structure, and precision rotary positioning. It achieves high positioning repeatability and improves efficiency by more than 40% compared to traditional equipment. The controllable damping characteristics of the magnetorheological fluid damper and the closed-loop control formed by the pressure sensing feedback system keep the impact pressure fluctuation within ±2%, significantly improving the consistency of laminated quality. It also facilitates electromagnetic limiting and electromagnetic unloading of the motor core, resulting in good performance and high efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0027] Figure 2 This is a bottom-view structural diagram of the present invention;

[0028] Figure 3 This is a structural schematic diagram of the base, stepper motor, bracket, and related parts of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the base, rotating shaft, first electromagnet, second electromagnet and related parts of the present invention.

[0030] Figure 5 This is a three-dimensional structural diagram of the punch structure of the present invention;

[0031] Figure 6 This is a front view of the punch structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the stamping disc of the present invention;

[0033] Figure 8 This is a bottom view schematic diagram of the stamping plate, support block, limiting rod, stripping structure and related parts of the present invention;

[0034] Figure 9 This is a schematic diagram of the structure of the stamping plate, stamping groove, rectangular sliding hole and related parts of the present invention;

[0035] Figure 10 This is a bottom view of the stamping plate, support block, limiting rod and related parts of the present invention;

[0036] Figure 11This is a schematic diagram of the material removal structure of the present invention;

[0037] Figure 12 This is a bottom view schematic diagram of the material removal structure of the present invention;

[0038] Figure 13 This is a schematic diagram of the limiting plate structure of the present invention;

[0039] Figure 14 This is a bottom view of the limiting plate structure of the present invention.

[0040] Among them: 1. Base; 11. Bottom cover;

[0041] 2. Stamping plate; 21. Stamping groove; 211. Rectangular sliding hole; 212. Stripping receiving groove; 213. Round hole; 22. Limiting plate structure; 221. Arc-shaped limiting plate; 222. Rectangular sliding rod; 223. Return spring; 224. Second permanent magnet; 225. Limiting hole; 23. Ball bearing; 24. Support block; 25. Limiting rod; 26. Stripping structure; 261. Stripping plate; 262. Round rod; 263. Return spring; 264. Insulating plate; 265. First permanent magnet; 27. Groove;

[0042] 3. Controller; 31. Power switch; 32. Emergency stop switch; 4. Bracket; 41. Top plate; 5. Cylinder;

[0043] 6. Punch structure; 61. Fixing plate; 62. Pressure sensing plate; 63. Shock-absorbing plate; 64. Mounting plate; 65. Punch head; 66. Pressure sensor; 661. Sensing wire; 67. Magnetorheological fluid damper; 68. Guide rod; 69. Helical spring;

[0044] 7. Stepper motor; 71. Rotary shaft; 8. First electromagnet; 9. Second electromagnet. Detailed Implementation

[0045] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0046] Example 1

[0047] like Figures 1-14As shown, this invention provides a high-efficiency motor core stacking device, including a base 1, a stamping plate 2, a stepper motor 7, a first electromagnet 8, and two second electromagnets 9. A bracket 4 is fixedly installed on the top of the base 1, and a top plate 41 is fixedly installed on the top of the bracket 4. A cylinder 5 is installed on the top of the top plate 41, and a punch structure 6 is installed on the output shaft of the cylinder 5. The stepper motor 7 is installed at the center of the inner wall of the base 1, and a rotating shaft 71 is installed on the output shaft of the stepper motor 7. The rotating shaft 71 is rotatably mounted to the base 1 via bearings. The stamping plate 2 is rotatably mounted on the top of the base 1. Multiple balls 23 are embedded in the bottom edge of the stamping plate 2, and the multiple balls 23 are slidably connected to the top of the base 1. A groove 27 is opened at the bottom of the stamping plate 2, and the inner wall of the groove 27 is fixedly installed to the top of the rotating shaft 71. Two stamping grooves 21 are symmetrically opened on the top of the pressure plate 2. Two limiting plate structures 22 are symmetrically arranged in the two stamping grooves 21. A stripping structure 26 is provided in each of the two stamping grooves 21. The stripping structure 26 is located between the corresponding two limiting plate structures 22. The first electromagnet 8 and two second electromagnets 9 are installed on the top of the base 1. The two stripping structures 26 are adapted to the first electromagnet 8. The bottom magnetic poles of the two stripping structures 26 are opposite to the top magnetic poles of the first electromagnet 8. The four limiting plate structures 22 are adapted to the two second electromagnets 9. The outer magnetic poles of the four limiting plate structures 22 are opposite to the inner magnetic poles of the two second electromagnets 9. A controller 3 is installed on the top of the base 1. A power switch 31 and an emergency stop switch 32 are installed on the side of the base 1. A bottom cover 11 is installed on the bottom of the base 1.

[0048] Specifically, a composite drive system consisting of a stepper motor (step angle 0.036°) and a precision ball bearing assembly (6mm diameter silicon nitride ceramic balls) is used to achieve a repeatability positioning accuracy of ±0.01mm for the stamping plate. The ball bearing support structure contains 32 precision balls with a diameter tolerance controlled within ±0.005mm and a friction coefficient <0.001.

[0049] More specifically, controller 3 uses a 32-bit ARM Cortex-M7 processor with a control cycle of 5ms, integrates an IO-Link communication module, supports 0.1ms-level solenoid valve control timing, and the emergency stop switch 32 conforms to the IEC 60947-5-5 standard with an off time of <20ms.

[0050] like Figure 1 , Figure 7 , Figure 9As shown, in this embodiment, two rectangular sliding holes 211 are symmetrically opened on the bottom inner wall of the stamping groove 21. Two limiting plate structures 22 are adapted to the two rectangular sliding holes 211. The limiting plate structure 22 includes an arc-shaped limiting plate 221, which is located inside the stamping groove 21. A rectangular sliding rod 222 is fixedly installed at the bottom of the arc-shaped limiting plate 221. A second permanent magnet 224 is fixedly installed on the outside of the rectangular sliding rod 222. The second permanent magnet 224 is adapted to the second electromagnet 9. The magnetic poles of the second permanent magnet 224 and the second electromagnet 9 are opposite on the side that are close to each other. The two second electromagnets 9 generate magnetism to push the two second permanent magnets 224 to move closer to each other. The two second permanent magnets 224 drive the two rectangular sliding rods 222 to move closer to each other.

[0051] Specifically, the electromagnet-permanent magnet composite drive system (the second electromagnet has a power density of 1.8 W / cm²) 3 ( ), with a return spring of 30 N / m elastic coefficient

[0052] The arc-shaped limiting plate has a closing response time of 15ms, an adjustable clamping force range of 50-200N, and a support block spacing tolerance of ±0.02mm.

[0053] like Figures 7-10 , Figure 13 , Figure 14 As shown, in this embodiment, four support blocks 24 are fixedly installed on the bottom inner wall of the groove 27. The four support blocks 24 are arranged symmetrically in pairs. A limiting rod 25 is fixedly installed between two support blocks 24. A limiting hole 225 is opened on the rectangular slide rod 222. The limiting hole 225 is slidably connected to the outer side of the limiting rod 25. A reset spring 223 is fixedly installed between the rectangular slide rod 222 and the support block 24. The reset spring 223 is sleeved on the outer side of the limiting rod 25. The second permanent magnet 224 is away from the second electromagnet 9. Through the pulling force of the reset spring 223, the two arc-shaped limiting plates 221 are moved away from each other, releasing the limitation on the motor core.

[0054] Specifically, the limit rod 25 is made of 40Cr steel with nitriding treatment, with a diameter of 12mm and a straightness of 0.01mm / m. The reset spring 223 is made of SUS304-WPB spring steel wire with a diameter of 1.2mm and a preload of 15N±2N.

[0055] like Figure 11 , Figure 12As shown, in this embodiment, the stripping structure 26 includes a stripping plate 261. A stripping receiving groove 212 is provided on the bottom inner wall of the stamping groove 21. The stripping plate 261 and the stripping receiving groove 212 are seamlessly slidably connected. Two round rods 262 are fixedly installed at the bottom of the stripping plate 261. The same insulating plate 264 is fixedly installed at the bottom of the two round rods 262. A first permanent magnet 265 is fixedly installed at the bottom of the insulating plate 264. The first permanent magnet 265 is adapted to the first electromagnet 8. The magnetic poles of the first permanent magnet 265 and the first electromagnet 8 are opposite on the side that are close to each other. The first electromagnet 8 generates magnetism to push the first permanent magnet 265 to move upward. The first permanent magnet 265 pushes the insulating plate 264 to move upward. The insulating plate 264 pushes the motor core upward through the two round rods 262 and the stripping plate 261 to extend to the top of the stamping groove 21, which can facilitate the removal and replacement of the motor core.

[0056] Specifically, the first electromagnet 8 generates a transient magnetic field of 1.2T, which, together with the NdFeB permanent magnet (N38SH grade), achieves a lifting stroke of 15mm.

[0057] like Figure 11 , Figure 12 As shown, in this embodiment, two round holes 213 are opened on the bottom inner wall of the unloading receiving groove 212. The round rod 262 is slidably connected to the inner wall of the round hole 213. Two return springs 263 are fixedly installed between the top of the insulating plate 264 and the inner wall of 27. The two return springs 263 are sleeved on the outside of the two round rods 262. Through the elastic force of the return springs 263, the unloading plate 261 enters the unloading receiving groove 212 for storage.

[0058] Specifically, the return spring 263 uses 0.8mm diameter piano wire, has a stiffness coefficient of 8N / mm, and a fatigue life >10. 6 Secondly, the insulation board 264 is made of 2mm thick epoxy resin fiberglass plate with a withstand voltage rating of 3kV / mm, and the round rod 262 has a hard chrome plating treatment (15μm thickness) and a straightness of 0.005mm.

[0059] In this embodiment, during operation, the power supply and controller 3 are connected. The motor core from a new energy vehicle is stacked and placed inside the stamping groove 21. The stepper motor 7 drives the rotating shaft 71 to rotate, which in turn drives the stamping plate 2 to rotate 90 degrees. The stamping plate 2 is slidably connected to the top of the base 1 via ball bearings 23, improving the stability of the stamping plate 2. The stamping groove 21 is moved below the punch structure 6. The two second electromagnets 9 generate magnetism, pushing the two second permanent magnets 224 closer together. The two second permanent magnets 224 drive the two rectangular slide rods 222 closer together. The two rectangular slide rods 222 slide outside the limiting rod 25, and the two reset springs 223 are under tension deformation. The two rectangular slide rods 222 drive the two arc-shaped limiting plates 221 to limit the motor core. At the same time, another motor core from a new energy vehicle is stacked and placed inside another stamping groove 21. Cylinder 5 pushes punch structure 6 downward to press the motor core, controls punch structure 6 to leave the stamping groove 21, and controls stamping plate 2 to rotate 90 degrees again to continue the pressing process. The processed motor core moves to the initial position, the second permanent magnet 224 moves away from the second electromagnet 9, and the two arc-shaped limiting plates 221 move away from each other through the tension of the reset spring 223, releasing the fixation of the motor core. The first electromagnet 8 generates magnetism to push the first permanent magnet 265 upward. The first permanent magnet 265 pushes the insulating plate 264 upward. The insulating plate 264 pushes the motor core upward through two round rods 262 and stripping plate 261 to extend to the top of the stamping groove 21, which can facilitate the removal and replacement of the motor core. The response time of the stamping plate rotation drive system is <50ms, the maximum speed is 30r / min, and the time for switching every 90° position is 0.5s.

[0060] Example 2

[0061] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figure 5 , Figure 6 As shown, to further better realize the present invention, the following configuration is specifically adopted: In this embodiment, the punch structure 6 includes a fixing plate 61. The top of the fixing plate 61 is fixedly installed with the output shaft of the cylinder 5. A pressure sensing plate 62 is installed at the bottom of the fixing plate 61. A pressure sensor 66 is provided between the fixing plate 61 and the pressure sensing plate 62. A sensing line 661 is connected to the pressure sensor 66. Multiple magnetorheological fluid dampers 67 are installed at the bottom of the multiple magnetorheological fluid dampers 67. The same damping plate 63 is installed at the bottom end of the multiple magnetorheological fluid dampers 67. Multiple guide rods 68 are slidably installed on the outside of the damping plate 63. The same mounting plate 64 is installed at the bottom end of the multiple guide rods 68. Multiple helical springs 69 are installed between the mounting plate 64 and the damping plate 63. The helical springs 69 are sleeved on the outside of the corresponding guide rods 68. The same punch head 65 is installed at the bottom of the mounting plate 64 by bolts.

[0062] In this embodiment, the fixed plate 61 pushes the pressure sensing plate 62 downward via the pressure sensor 66. The pressure sensing plate 62 then pushes the magnetorheological fluid damper 67, the shock absorber 63, the helical spring 69, the mounting plate 64, and the stamping head 65 downward. The stamping head 65 presses the motor core, creating the first stage of buffering: the helical spring 69 absorbs the initial impact through a pre-compression structure, employing an asymmetric variable pitch spring with a stiffness gradient, and the pre-compression amount is adjustable from 5-15mm to accommodate different thicknesses of laminated plates. The second stage of buffering: the magnetorheological fluid damper 67 provides a dynamic response, with the coil winding generating a controllable magnetic field of 0.5-1.2T, and a viscosity adjustment response time of <10ms, improving the stamping effect. After stamping is completed...

[0063] Specifically, the helical spring 69 adopts an asymmetric variable pitch design (pitch gradient 0.2-0.5mm), with a preload continuously adjustable from 5-15mm. The magnetorheological damper 67 has a built-in 4000-turn electromagnetic coil, a maximum damping force of 3000N, and a response time of <10ms. The pressure sensor 66 has a range of 0-50kN, an accuracy of ±0.5%FS, and a sampling frequency of 1kHz. The guide rod 68 has a diamond-like coating on its surface, a friction coefficient of <0.05, and a diameter of 20h7 grade tolerance.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency motor core stacking device, characterized in that: include: A base (1) is fixedly mounted on the top of the base (1), a bracket (4) is fixedly mounted on the top of the bracket (4), a top plate (41) is fixedly mounted on the top of the top plate (41), a cylinder (5) is mounted on the top of the top plate (41), and a punch structure (6) is mounted on the output shaft of the cylinder (5). A stepper motor (7) is installed at the center of the inner wall of the base (1). A rotating shaft (71) is installed on the output shaft of the stepper motor (7). The rotating shaft (71) is rotatably mounted to the base (1) via a bearing. The stamping plate (2) is rotatably mounted on the top of the base (1). The bottom of the stamping plate (2) is provided with a groove (27). The inner wall of the groove (27) is fixedly mounted to the top of the rotating shaft (71). The top of the stamping plate (2) is symmetrically provided with two stamping slots (21). Two limiting plate structures (22) are symmetrically arranged in the two stamping slots (21). A stripping structure (26) is provided in both stamping slots (21). The stripping structure (26) is located between the corresponding two limiting plate structures (22). The first electromagnet (8) and two second electromagnets (9) are all installed on the top of the base (1). The two unloading structures (26) are adapted to the first electromagnet (8), and the four limiting plate structures (22) are adapted to the two second electromagnets (9). The limiting plate structure (22) includes an arc-shaped limiting plate (221), which is located inside the stamping groove (21). A rectangular slide rod (222) is fixedly installed at the bottom of the arc-shaped limiting plate (221), and a second permanent magnet (224) is fixedly installed on the outside of the rectangular slide rod (222). The second permanent magnet (224) is compatible with the second electromagnet (9), and the magnetic poles of the second permanent magnet (224) and the second electromagnet (9) are opposite on the side that are close to each other. The stripping structure (26) includes a stripping plate (261), and a stripping receiving groove (212) is provided on the bottom inner wall of the stamping groove (21). The stripping plate (261) and the stripping receiving groove (212) are seamlessly slidably connected. Two round rods (262) are fixedly installed at the bottom of the stripping plate (261). The same insulating plate (264) is fixedly installed at the bottom of the two round rods (262). A first permanent magnet (265) is fixedly installed at the bottom of the insulating plate (264). The first permanent magnet (265) is adapted to the first electromagnet (8).

2. The high-efficiency motor core stacking device according to claim 1, characterized in that: A controller (3) is installed on the top of the base (1), a power switch (31) and an emergency stop switch (32) are installed on the side of the base (1), and a bottom cover (11) is installed on the bottom of the base (1).

3. The high-efficiency motor core stacking device according to claim 1, characterized in that: Two rectangular sliding holes (211) are symmetrically opened on the bottom inner wall of the stamping groove (21), and the two limiting plate structures (22) are adapted to the two rectangular sliding holes (211).

4. The high-efficiency motor core stacking device according to claim 1, characterized in that: Four support blocks (24) are fixedly installed on the bottom inner wall of the groove (27). The four support blocks (24) are arranged symmetrically in pairs. A limit rod (25) is fixedly installed between two support blocks (24). A limit hole (225) is opened on the rectangular slide rod (222). The limit hole (225) is slidably connected to the outside of the limit rod (25). A reset spring (223) is fixedly installed between the rectangular slide rod (222) and the support block (24). The reset spring (223) is sleeved on the outside of the limit rod (25).

5. The high-efficiency motor core stacking device according to claim 1, characterized in that: Two round holes (213) are opened on the bottom inner wall of the unloading receiving tank (212). The round rod (262) is slidably connected to the inner wall of the round hole (213). Two reset springs (263) are fixedly installed between the top of the insulating plate (264) and the inner wall of (27). The two reset springs (263) are sleeved on the outside of the two round rods (262).

6. The high-efficiency motor core stacking device according to claim 1, characterized in that: The bottom edge of the stamping plate (2) is inlaid with multiple balls (23), and the multiple balls (23) are slidably connected to the top of the base (1).

7. The high-efficiency motor core stacking device according to claim 1, characterized in that: The punch structure (6) includes a fixing plate (61), the top of the fixing plate (61) is fixedly installed with the output shaft of the cylinder (5), a pressure sensing plate (62) is installed at the bottom of the fixing plate (61), a pressure sensor (66) is provided between the fixing plate (61) and the pressure sensing plate (62), and a sensing line (661) is connected to the pressure sensor (66).

8. The high-efficiency motor core stacking device according to claim 7, characterized in that: Multiple magnetorheological dampers (67) are installed at the bottom of the pressure sensing plate (62). The same damping plate (63) is installed at the bottom end of the multiple magnetorheological dampers (67). Multiple guide rods (68) are slidably installed on the outside of the damping plate (63). The same mounting plate (64) is installed at the bottom end of the multiple guide rods (68). Multiple helical springs (69) are installed between the mounting plate (64) and the damping plate (63). The helical springs (69) are sleeved on the outside of the corresponding guide rods (68). The same stamping head (65) is installed at the bottom of the mounting plate (64) by bolts.

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