Method for improving stable performance of high-speed motor

Abstract

The invention provides a method for improving the stable performance of a high-speed motor, which comprises the following steps of: stamping a silicon steel sheet into a required shape, polishing to remove a sharp edge part, forming a recess on the surface of the silicon steel sheet by adopting a falling type impact device, and placing the silicon steel sheet on a magnetic flux leakage crack detection device for magnetic flux leakage crack detection. Silicon steel sheets with detailed cracks are visually eliminated, the silicon steel sheets are sleeved with a rotating shaft in a rotary gluing device and are glued, glue is thrown out of gaps of the silicon steel sheets in a rotary glue throwing device, multiple layers of silicon steel sheets are laminated through a pressing plate, and pits are formed in the two faces of each silicon steel sheet through a dynamic impact method; fatigue damage of various vibration modes of the high-speed motor to the silicon steel sheet is simulated in advance, the silicon steel sheet with defects in microcosmic is broken in advance, the effects of finding and preventing in advance are achieved, defective products are found rapidly and economically by adopting the magnetic pole observation sheet and utilizing the magnetic conductivity of the silicon steel sheet, and the stability of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a method for improving the stability of high-speed electric machines. BACKGROUND

[0002] Stability is one of the core requirements of electric machine design, especially for high-speed electric machines. The rotor of a long-term used high-speed electric machine will be subjected to complex lateral and radial vibrations. The rotor of some high-speed electric machines adopts a laminated structure of silicon steel sheets, and the layers are bonded by resin. In order to reduce eddy current loss, the silicon steel sheets should be as thin as possible. However, the silicon steel sheet is a brittle metal with poor toughness and has micro lattice defects. Complex vibrations often occur during high-speed rotation. During the vibration process, the silicon steel sheet will break. In order to prevent the laminated structure from being damaged, the bonding resin needs to have a certain thickness. The thicker the bonding resin, the better the stability of the laminated structure, but it will reduce the volume ratio of the silicon steel sheet and the power factor, and increase the size and cost of the electric machine. The engineering design difficulty of the laminated structure of silicon steel sheets is that the silicon steel sheet is thinned to reduce eddy current loss, but the bonding resin needs to be thickened, which reduces the power factor and economy. If the silicon steel sheet is thickened, the eddy current loss will increase, the efficiency of the electric machine will decrease, and the silicon steel sheet will be subjected to metal fatigue in complex vibrations, resulting in cracks. The magnetic resistance of the crack increases, the efficiency of the electric machine decreases, and the dynamic balance of the rotor shaft is destroyed. The destruction of the dynamic balance will increase the vibration amplitude, and thus more cracks will be generated, which will form a vicious cycle and shorten the service life of the electric machine. Therefore, it is necessary to develop a method for improving the stability of high-speed electric machines to balance the thickness of the silicon steel sheet and the comprehensive engineering consideration of the stability and economy of the electric machine.

[0003] From the history of high-speed failure of silicon steel rotor, the main reason is the brittleness of silicon steel sheet. If the silicon steel sheet is made thicker, the mechanical strength will increase, but the eddy current loss will increase, which is not conducive to the efficiency of the electric machine. If the formula of the silicon steel sheet is changed, it will involve complex problems of the upstream supplier, mainly the contradiction between magnetic permeability and mechanical strength, which cannot be reconciled. This has long plagued the metallurgical field. As an electric machine enterprise, the present application cannot change the composition of the existing silicon steel sheet, which also puzzles all employees in the electric machine industry.

[0004] In order to improve the high-speed stability performance of silicon steel sheet, the R&D team of the company believes that if the quality problem of silicon steel sheet leads to high-speed problem, the quality detection of silicon steel sheet will be taken as the R&D direction, the vibration test is simulated, and the vibration resistance characteristics of silicon steel sheet are detected in advance, but for the flaw detection of silicon steel sheet, expensive X-ray perspective equipment needs to be purchased, which blocks the way for the factory in terms of X-ray detection cost and time cost, at the same time, some silicon steel sheet cracks are not generated in the production process, but are generated in the high-speed vibration environment, how to simulate the vibration test also makes the R&D personnel scratch their heads, after long-term thinking and research, once, the inventor repairs the mobile phone, sees the application of magnetic pole observation sheet in mobile phone repair, obtains inspiration, combines the characteristics of silicon steel sheet conducting magnetic lines, solves the problems of rapid and economical detection technology of silicon steel sheet crack, and further the unit to which the inventor belongs actively invests funds, subscribes molds, makes various hardware workpieces, invests manpower to carry out various parameter adjustment and comparison test, and finally the inventor develops the present application. SUMMARY

[0005] In view of the defects of the prior art, the present application attempts to overcome the above defects, and therefore provides a method for improving the stability performance of high-speed motor, solves the problem of vibration fatigue damage of silicon steel sheet under high-speed rotation, and improves the stability of the motor.

[0006] In order to achieve the above object, the application is implemented by the following technical solutions: a method for improving the stability of a high-speed motor, first, stamping and forming a silicon steel sheet, second, removing the sharp part of the edge of the silicon steel sheet by grinding, third, forming a recess on the surface of the silicon steel sheet by using a falling impact device, fourth, placing the silicon steel sheet on a magnetic flux leakage crack detection device to detect the magnetic flux leakage crack, and visually eliminating the silicon steel sheet with a clear crack, fifth, sleeving the silicon steel sheet into the rotating shaft in the rotating glue coating device and coating glue, sixth, throwing out the glue from the gap between the silicon steel sheets in the rotating glue throwing device, and stacking the multi-layer silicon steel sheets by using the pressing plate, seventh, taking out the pressed silicon steel sheet stacking assembly and solidifying the glue, and eighth, adjusting the dynamic balance of the silicon steel sheet stacking assembly, the falling impact device comprises a fixed module and a falling body module, the lower surface of the falling body module is provided with a protrusion, and the upper surface of the fixed module is provided with a protrusion, the third step is to place the silicon steel sheet on the upper surface of the fixed module and let the falling body module hit the silicon steel sheet to form a recess on the upper and lower surfaces of the silicon steel sheet, the magnetic flux leakage crack detection device comprises a magnetic base and a magnetic pole observation sheet, the magnetic base is composed of an array of magnets with opposite adjacent magnetic poles, the silicon steel sheet to be measured is placed on the upper surface of the magnetic base, and the magnetic pole observation sheet is placed on the upper surface of the silicon steel sheet and kept unchanged with the horizontal position of the magnetic base, the fourth step is to move the silicon steel sheet horizontally, observe whether the color of the magnetic pole observation sheet changes due to magnetic flux leakage, if the color change of the magnetic pole observation sheet due to the leakage of magnetic flux is found at the crack position, it indicates that the silicon steel sheet needs to be discarded, and if the color change of the magnetic pole observation sheet due to the leakage of magnetic flux is not found at the whole plane position of the silicon steel sheet, it indicates that the silicon steel sheet can be selected to enter the next step, the rotating glue coating device comprises a glue container, a glue outlet and a motor, the middle of the glue container is provided with the motor, the motor is connected with the rotating shaft and drives the rotating shaft to rotate, the glue outlet flows out the glue and faces the part of the rotating shaft, the silicon steel sheet is sleeved into the rotating shaft, and the glue in the glue container floods the silicon steel sheet, the rotating glue throwing device comprises a glue collecting container and a high-speed motor, the middle of the glue collecting container is provided with the high-speed motor, and the sixth step is achieved by the method that the upper and lower surfaces of the silicon steel sheet stack are positively pressed by the pressing plate through the pull rod, the rotating shaft connected with the high-speed motor is rotated to throw out the glue between the silicon steel sheet stack.

[0007] Further, the surface protrusions of the fixed module and the falling body module are in the shape of a pyramid.

[0008] Further, the falling body module is guided by the guide rod or guide column during falling.

[0009] Further, the surface protrusions of the fixed module and the falling body module are misaligned in the horizontal direction, and the misalignment size is not greater than the recess depth of the surface of the silicon steel sheet.

[0010] Furthermore, in the rotary coating device, the motor needs to be stopped after each silicon steel sheet is placed, and the machine needs to stand still for 30 seconds before placing a new silicon steel sheet and then restarting the motor.

[0011] Furthermore, the adhesive is an epoxy resin adhesive.

[0012] Furthermore, the magnets in the magnet array are permanent magnets.

[0013] Furthermore, 10%-20% by weight of nano-calcium carbonate is added to the adhesive.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a dynamic impact method to create indentations on both sides of silicon steel sheets, simulating the fatigue damage caused by various vibration modes of high-speed motors. This allows for the early cracking of silicon steel sheets with microscopic defects, enabling early detection and prevention. A magnetic observation plate is used, leveraging the magnetic permeability of the silicon steel sheets, to quickly and economically identify defective products, effectively screening them. The remaining silicon steel sheets can withstand the fatigue test under high-speed motor vibration. The indentations on both sides of the silicon steel sheets effectively increase the contact area between the adhesive and the sheets, improving the high-speed stability of the laminated sheets. The rotary adhesive applicator effectively removes the influence of air bubbles, and the rotary adhesive-spinning device effectively reduces the adhesive thickness, improving the motor's economy. The addition of nano-calcium carbonate to the adhesive increases bonding strength and acts as a hard barrier between the silicon steel sheets, preventing electrical contact between adjacent sheets during the pressing process. Attached Figure Description

[0015] Figure 1 A cross-sectional schematic diagram showing the relative positions of the silicon steel sheet, the fixed module, and the falling module in a drop impact device; Figure 2 A cross-sectional schematic diagram showing the relative positions of the silicon steel sheet, magnet, and magnetic pole observation plate in a magnetic flux leakage crack detection device; Figure 3 : A cross-sectional schematic diagram of the rotary adhesive applicator; Figure 4 : Schematic diagram of the cross-section of the rotary glue-spinning device; Figure 5 : A cross-sectional schematic diagram of a partially stacked silicon steel sheet structure.

[0016] In the diagram: 1. Silicon steel sheet; 2. Fixed module; 3. Falling module; 4. Magnet; 5. Magnetic pole observation plate; 6. Glue container; 7. Glue outlet; 8. Motor; 9. Glue collection container; 10. High-speed motor; 11. Pressure plate; 12. Pull rod; 13. Rotating shaft. Detailed Implementation

[0017] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0018] This invention provides a method for improving the stability performance of a high-speed motor, such as... Figures 1-5As shown, the process involves: first, stamping silicon steel sheet 1 into the desired shape; second, removing sharp edges of silicon steel sheet 1 by grinding; third, using a drop impact device to create a dent on the surface of silicon steel sheet 1; fourth, placing silicon steel sheet 1 on a magnetic flux leakage crack detection device for magnetic flux leakage crack detection, visually rejecting silicon steel sheets 1 with fine cracks; fifth, fitting silicon steel sheet 1 into a rotating shaft 13 in a rotary adhesive applicator and applying adhesive; sixth, using a rotary adhesive-spinning device to fling adhesive from the gaps between silicon steel sheets 1, and stacking multiple layers of silicon steel sheets 1 using a pressure plate 11; seventh, removing the stacked silicon steel sheet 1 assembly and allowing the adhesive to solidify; and eighth, adjusting the dynamic balance of the stacked silicon steel sheet 1 assembly. The drop impact device includes a fixed module 2 and... The falling module 3 has protrusions on its lower surface, and the fixed module 2 has protrusions on its upper surface. The third step involves placing the silicon steel sheet 1 on the upper surface of the fixed module 2 and allowing the falling module 3 to strike the silicon steel sheet 1, creating indentations on both the upper and lower surfaces. The magnetic flux leakage crack detection device includes a magnetic base and a magnetic pole observation plate 5. The magnetic base consists of an array of magnets with opposite adjacent magnetic poles. The silicon steel sheet 1 to be measured is placed on the upper surface of the magnetic base, and the magnetic pole observation plate 5 is placed on the upper surface of the silicon steel sheet 1, maintaining a horizontal position with the magnetic base. The fourth step involves horizontally moving the silicon steel sheet 1 and observing whether the magnetic pole observation plate 5 shows any magnetic flux leakage causing a color change. If magnetic flux leakage is found at the crack location, causing a change in magnetic pole observation... The color change of sheet 5 indicates that the silicon steel sheet 1 needs to be discarded. If no magnetic flux leakage is found in the entire plane of the silicon steel sheet 1, causing a color change in the observed magnetic poles of sheet 5, it indicates that the silicon steel sheet 1 can proceed to the next step. The rotary adhesive applicator includes an adhesive container 6, an adhesive outlet 7, and a motor 8. The motor 8 is located in the middle of the adhesive container 6. The motor 8 is connected to the rotating shaft 13 and drives the rotating shaft 13 to rotate. Adhesive flows out of the adhesive outlet 7 and is directed towards the part of the rotating shaft 13. The silicon steel sheet 1 is then placed onto the rotating shaft 13. The adhesive in the adhesive container 6 submerges the silicon steel sheet 1. The rotary adhesive spinning device includes an adhesive collection container 9 and a high-speed motor 10. The high-speed motor 10 is located in the middle of the adhesive collection container 9. The method for implementing the above sixth step is to complete the adhesive application... The upper and lower surfaces of the silicon steel sheet 1 stack are positively pressed by the pressure plate 11 through the pull rod 12, so that the rotating shaft 13 is connected to the high-speed motor 10 to rotate, and the glue between the silicon steel sheet 1 stack is thrown out. The surface protrusions of the fixed module 2 and the falling module 3 are in the shape of a pyramid. The falling module 3 is guided by the guide rod or guide column during the falling process. The surface protrusions of the fixed module 2 and the falling module 3 are misaligned in the horizontal direction. The size of the misalignment is no greater than the depth of the depression on the surface of the silicon steel sheet 1. In the rotary glue coating device, the motor 8 needs to be stopped after each silicon steel sheet 1 is placed and left to stand for 30 seconds. After placing a new silicon steel sheet 1, the motor 8 is restarted again. The glue is epoxy resin glue, the magnet 4 of the magnet array is a permanent magnet, and 20% by weight of nano calcium carbonate is added to the glue.

[0019] Working principle: The falling module 3 impacts the silicon steel sheet 1, not only creating indentations on the upper and lower surfaces of the silicon steel sheet 1, but also dynamically generating multiple vibration modes during the collision. This effectively simulates the multimodal vibration fatigue damage of a high-speed motor, amplifying and breaking the original microstructural defects of the silicon steel sheet 1. The silicon steel sheet 1 can then be removed in the next step. During the stacking process of the silicon steel sheets 1, recessed glue protrusions are formed between adjacent silicon steel sheets 1, effectively fixing and connecting them. In the rotary glue applicator, the silicon steel sheet 1 and the glue undergo sufficient unbalanced contact. This unbalanced contact removes air bubbles from the surface of the silicon steel sheet 1, resulting in a tighter bond between the silicon steel sheet 1 and the glue. In the rotary glue applicator... With the help of the pressure plate 11 and centrifugal force, the adhesive between the silicon steel sheets 1 can be made as thin as possible. At the same time, under the action of surface tension, the remaining adhesive adheres to the silicon steel sheets 1. When the magnetic leakage crack detection device is used to detect magnetic leakage cracks, the magnetic lines of force of the magnetic base will be conducted by the silicon steel sheets 1 above. If there is a crack in the silicon steel sheet 1, magnetic leakage will occur. The magnetic leakage will cause the corresponding position of the magnetic pole observation plate 5 above to change color. In this way, the crack can be found quickly, which is economical and efficient. The addition of nano calcium carbonate to the adhesive can increase the strength of the adhesive on the one hand, and make the nano calcium carbonate act as a hard barrier between the silicon steel sheets 1 on the other hand, avoiding electrical contact between adjacent silicon steel sheets 1 during the pressing process.

[0020] Specific embodiments and descriptions The first step is to stamp the silicon steel sheet 1 into the shape of a disc, with a circular outer circumference and a mounting hole in the center for the shaft to pass through. The second step is to remove burrs from the edges of the silicon steel sheet 1 using a specialized deburring machine. The third step is to place the silicon steel sheet 1 above the fixed module 2 of the drop impact device, using vacuum negative pressure technology to fix the silicon steel sheet 1 to the surface of the fixed module 2. An air pipe is installed at the bottom of the fixed module 2. The drop module 3 falls along a vertical guide rod from a height of 1.5 meters, impacting the silicon steel sheet 1 50 times. Group 3 is lightweight and has a high drop count, proving to better simulate multimodal vibration damage during high-speed rotation. The release and lifting of the falling module 3 can be achieved manually or via an external robotic arm and electromagnet for vertical grasping, lifting, and release. Both the falling module 3 and the fixed module 2 are made of high-strength mold steel. The angle between the slope and the base of the surface pyramid is approximately 51 degrees, and the pyramid height is 1.1 cm. The indentation depth formed on the surface of the silicon steel sheet 1 is 0.1-0.2 mm. The magnet in the fourth step's magnetic flux leakage crack detection device is a neodymium iron boron permanent magnet. Figure 2The symbols N and S represent the orientation of the magnetic poles. A single neodymium iron boron permanent magnet measures 10 cm x 1 cm x 10 cm. The magnet array consists of 8 neodymium iron boron permanent magnets. A support is used to place the magnetic pole observation piece 5 above the magnet array, with the gap in the middle just large enough to fit the silicon steel sheet 1. During measurement, the silicon steel sheet 1 is inserted, and its horizontal movement is observed to check for color changes in the magnetic pole observation piece 5. In mass production, machine vision and intelligent image recognition can be introduced to improve detection speed. Using high-quality silicon steel sheet 1 results in a 15% rejection rate at this step; using cheaper silicon steel sheet 1 results in a 32% rejection rate. In the fifth step, the rotating shaft 13 is installed and connected to the rotary coating device, and the silicon steel sheets 1 are sequentially... Insert the silicon steel sheet 1 into the rotating shaft 13 and apply glue. In the rotary glue application device, after each silicon steel sheet 1 is placed, the motor needs to be stopped and left to stand for 30 seconds. After that, a new silicon steel sheet 1 is placed and the motor is restarted. Glue flows out of the glue outlet 7 and is directed towards the rotating shaft 13, so that the glue in the glue container 6 can always submerge the silicon steel sheet 1. As an improvement, an ultrasonic generator can be introduced and immersed in the glue to accelerate the separation speed of air bubbles and glue. In the sixth step, take out the rotating shaft 13 with the stacked silicon steel sheets 1, and use the pressure plate 11 and the pull rod 12 to stack the multiple layers of silicon steel sheets 1 and put them into the rotary glue-spinning device. The lower part of the rotating shaft 13 is connected to the rotating shaft of the high-speed motor 10, and the upper part of the rotating shaft 13 is connected to another rotation constraint device. Figure 4 (Not shown in the diagram) To prevent the shaft 13 from swinging, start the high-speed motor 10 to fling out the glue. After starting for 10 minutes, stop the high-speed motor 10, tighten the pull rod 12 to apply pressure to the multi-layer silicon steel sheet 1, and then start the high-speed motor 10 again. Repeat this process 10 times to finish. Step 7: Remove the silicon steel sheet stacking assembly and let it stand for the glue to solidify. Then unload the pressure plate 11 and pull rod 12. The pressure plate 11 is a thick PVC plate. The PVC material can prevent the pressure plate 11 from sticking to the resin glue. Step 8: Use the YYQ-18 horizontal rotor double support dynamic balancing machine to perform dynamic balance testing on the silicon steel sheet stacking assembly, mark the counterweight adjustment position, and adjust the counterweight using the weight removal method (drilling, milling).

[0021] Test results showed that a portion of the silicon steel sheet laminated structure block was cut from 100 of the above-mentioned finished products using wire cutting. The resistance between adjacent silicon steel sheets was measured with a multimeter, and 100% of the samples showed non-electrical contact. The thickness of the silicon steel sheet laminated structure block was 100.5% of the sum of the thicknesses of all silicon steel sheets, meaning that the adhesive thickness only provided a 0.5% increase. Mechanical performance tests showed that the tangential bonding strength of the silicon steel sheet laminated structure block was 150%-200% of the strength of the homogeneous adhesive after hardening. In the aging test, the above-mentioned finished products, as high-speed motor rotors, operated stably for 5000 hours in a durability test at a speed of 20,000 rpm. The silicon steel sheet laminated structure was removed and X-rayed, and no obvious cracks were found. After the above-mentioned 100 finished products completed the above durability test, after excluding other factors, no harmful changes in the power factor of the rotor were found, indicating that the present invention has achieved the research and development investment goals in improving the stability performance of high-speed motors.

[0022] Free fall is one way for the falling module 3 to obtain kinetic energy. Technicians in this industry can also use pneumatic, electric, or hammering methods to obtain kinetic energy to form indentations on the silicon steel sheet 1. The third and fourth steps of this invention embody the basic principles, main features, and technical advantages of this invention for the early testing, early detection, rapid detection, and economical testing of the silicon steel sheet 1.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A method for improving the stability performance of a high-speed motor, characterized in that: The first step is to stamp the silicon steel sheet (1) into shape. The second step is to remove the sharp edges of the silicon steel sheet (1) by grinding. The third step is to use a drop impact device to form a dent on the surface of the silicon steel sheet (1). The fourth step is to place the silicon steel sheet (1) on a magnetic flux leakage crack detection device for magnetic flux leakage crack detection, and visually reject the silicon steel sheet (1) with fine cracks. The fifth step is to put the silicon steel sheet (1) into the rotating shaft (13) in a rotary glue coating device and apply glue. The sixth step is to throw the glue out from the gaps of the silicon steel sheet (1) in a rotary glue-spinning device, and use a pressure plate (11) to stack multiple layers of silicon steel sheets (1). The seventh step is to take out the pressed silicon steel sheet stacking assembly and solidify the glue. The eighth step is to... To adjust the dynamic balance of the silicon steel sheet stacking assembly, the drop impact device includes a fixed module (2) and a drop module (3). The lower surface of the drop module (3) is provided with a protrusion, and the upper surface of the fixed module (2) is provided with a protrusion. The third step method is to place the silicon steel sheet (1) on the upper surface of the fixed module (2) and let the drop module (3) hit the silicon steel sheet (1), forming a depression on the upper and lower surfaces of the silicon steel sheet (1). The magnetic flux leakage crack detection device includes a magnetic base and a magnetic pole observation plate (5). The magnetic base is composed of an array of magnets with opposite adjacent magnetic poles. The silicon steel sheet (1) to be measured is placed on the upper surface of the magnetic base, and the magnetic pole observation plate (5) is placed on the upper surface of the silicon steel sheet (1) and kept in place. With the horizontal position of the magnetic base unchanged, the above fourth step is implemented by horizontally moving the silicon steel sheet (1) and observing whether the magnetic pole observation piece (5) has magnetic leakage causing color change. If magnetic flux leakage is found at the crack position causing color change of the magnetic pole observation piece (5), it indicates that the silicon steel sheet (1) needs to be discarded. If no magnetic flux leakage is found in the entire plane position of the silicon steel sheet (1) causing color change of the magnetic pole observation piece (5), it indicates that the silicon steel sheet (1) can be selected to enter the next step. The rotary adhesive applicator includes an adhesive container (6), an adhesive outlet (7), and a motor (8). The motor (8) is set in the middle of the adhesive container (6). The motor (8) is connected to the rotary adhesive applicator. Shaft (13) and drive the shaft (13) to rotate. Glue flows out of the glue outlet (7) and is directed towards the shaft (13). The silicon steel sheet (1) is fitted into the shaft (13). The glue in the glue container (6) submerges the silicon steel sheet (1). The rotating glue-spinning device includes a glue collection container (9) and a high-speed motor (10). The high-speed motor (10) is set in the middle of the glue collection container (9). The method for implementing the sixth step is to press the upper and lower surfaces of the silicon steel sheet (1) stack after glue application with a pressure plate (11) through a pull rod (12) to make the shaft (13) connected to the high-speed motor (10) rotate and to fling out the glue between the silicon steel sheet (1) stacks.

2. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: The surfaces of the fixed module (2) and the falling module (3) are pyramid-shaped.

3. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: The falling module (3) is guided by a guide rod or guide post during the falling process.

4. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: The surface protrusions of the fixed module (2) and the falling module (3) are misaligned in the horizontal direction, and the size of the misalignment is not greater than the depth of the depression on the surface of the silicon steel sheet (1).

5. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: In the rotary coating device, the motor (8) needs to be stopped after each silicon steel sheet (1) is placed and left to stand for 30 seconds before a new silicon steel sheet (1) is placed and the motor (8) is started again.

6. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: The adhesive is an epoxy resin adhesive.

7. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: The magnets (4) in the magnet array are permanent magnets.

8. The method for improving the stability performance of a high-speed motor according to claim 1, characterized in that: Add 10%-20% by weight of nano-calcium carbonate to the adhesive.

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