Non-contact dynamic balance automatic adjusting method

Abstract

The invention belongs to the technical field of mechanical structures, and relates to a non-contact dynamic balance automatic adjusting method. The method is realized based on a dynamic balance automatic adjusting device, and the device comprises a vibration sensor, a permanent magnet, a magnetic ring and a controller, according to the device, dynamic compensation can be carried out in time according to the actual dynamic unbalance detection result of the shaft, and compensation can be further carried out by adjusting the magnitude of the power supply current of the magnetic ring after device parameters change (for example, the magnetic induction intensity of the permanent magnet is reduced). In addition, the motion state and the dynamic unbalance degree change of the shaft can be monitored through the change of the actual compensation current, when the compensation amount reaches a set value, the fault condition can be avoided through alarm reminding, and considerable safety benefits are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical structure technology, and relates to the dynamic balance adjustment of shaft-type rotating parts, and is particularly suitable for high-speed, small-diameter rotating shafts with high dynamic balance requirements, and usage scenarios where the dynamic balance state of the rotating shaft will change due to the use conditions. It relates to a non-contact dynamic balance automatic adjustment method. Background Art

[0002] The dynamic imbalance of rotating shafts, especially high-speed rotating shafts, will have a great impact on their own operation and the installed mechanisms. Therefore, high-speed rotating shafts generally limit their dynamic imbalance, that is, put forward dynamic balance requirements.

[0003] Generally, the dynamic balancing of rotating shafts is achieved by statically compensating the mass imbalance of the shaft itself by sticking / removing materials on the shaft or installing additional weight-reducing balancing rings. For special products or structures that require adjustment of the dynamic balancing compensation during use or maintenance, the general practice is to install an adjustable device on the rotating shaft and adjust its center of gravity through the control system to compensate for the mass imbalance of the rotating shaft. These supplementary methods are essentially static compensation for the mass imbalance of rotating parts to a certain extent.

[0004] Due to structural and functional limitations, some rotating shafts have a small diameter and a high rotation speed, and the installation connection or use conditions may change during their working state, resulting in changes in their dynamic balance state. In this case, adding a static dynamic balance compensation device to the rotating shaft cannot achieve automatic adjustment of the dynamic balance during use, and due to the limitations of the shaft size and wire connection, the automatic adjustment device with adjustable center of gravity cannot be effectively installed on the shaft, or the installation of the center of gravity adjustment device on the shaft will affect the operation of the shaft or equipment. Therefore, it is necessary to redesign a device for automatic dynamic balancing of the rotating shaft under such circumstances. Summary of the invention

[0005] Purpose of the Invention

[0006] The present invention mainly solves several problems of automatic dynamic balancing of high-speed rotating shafts. The present method can:

[0007] 1) There is no need to attach too many additional devices to the rotating shaft, which does not affect the working state of the rotating shaft and the installed mechanism;

[0008] 2) By controlling the device surrounding the outside of the shaft, the dynamic imbalance of the rotating shaft is compensated by magnetic attraction without changing the mass distribution of the shaft itself.

[0009] 3) Different compensations can be made to different cross sections of the rotating shaft as needed to make the working state of the rotating shaft more stable;

[0010] 4) By monitoring the dynamic balance of the rotating shaft and according to a specific algorithm, the compensation amount can be adjusted in a timely manner to ensure that the rotating shaft is always in a stable working state.

[0011] Technical solution

[0012] A non-contact dynamic balance automatic adjustment method is realized based on a dynamic balance automatic adjustment device. The dynamic balance automatic adjustment device includes a vibration sensor, a permanent magnet, a magnetic ring and a controller; the vibration sensor is used to monitor the mass eccentricity of a certain part of the shaft in real time; the permanent magnet is pasted on the shaft, and through the interaction between the magnetic ring and the permanent magnet, a pushing / pulling force can be applied to the shaft at the pasted part; the magnetic ring is externally powered to change the magnetic field size, and then a pushing / pulling force is applied to the permanent magnet in the magnetic field; the controller: calculates the size and direction of the power supply for each magnetic ring through the data obtained by the vibration sensor, so as to control the magnetic field of the magnetic ring in real time.

[0013] The steps are as follows:

[0014] Step 1: According to the structure and vibration characteristics of the transmission shaft, select the parts that need to be balanced and compensated. For the transmission shaft shown in the attachment, dynamic balance compensation needs to be carried out on three parts at both ends and in the middle. Figure 1 As shown in the attached figure, dynamic balance compensation needs to be carried out on three parts at both ends and in the middle of the transmission shaft.

[0015] Step 2: Conduct an initial dynamic unbalance detection on the shaft, and record the initial unbalance amount and angular direction of each part.

[0016] Step 2: At each part of the shaft that needs balance compensation, paste three identical permanent magnets in sequence. The axial spacing of these three permanent magnets is the same as the width of the magnetic ring, and the circumferential angular spacing is 120°. They are numbered 1, 2, and 3 respectively; by controlling the weights of the permanent magnets in different angular directions, static compensation for the initial unbalance of the shaft is carried out.

[0017] Step 3: At each part, place three magnetic rings corresponding to the permanent magnets outside the shaft, and the numbers corresponding to the permanent magnets are 1, 2, and 3.

[0018] Step 4: Install one vibration sensor at the middle magnetic ring of each group of magnetic rings.

[0019] Step 5: Connect the vibration sensor, the controller, and the magnetic ring.

[0020] Step 6: During the operation of the shaft, the mass eccentricity and angular direction of each part of the shaft are detected in real time through the vibration sensor.

[0021] Step 7: Calculate the magnitude and direction of the current that needs to be supplied to each magnetic ring through the controller. For the middle part of the shaft, when the mass eccentricity angular direction is within the range of 0 - 30°, compensation can be carried out by controlling the magnetic rings corresponding to the permanent magnets at the 0° and 240° angular directions. The calculation formula is as follows:

[0022] A * cos(X) + C * cos(60 - X) = 10

[0023] A * sin(X) + C * sin(X) = 0

[0024] Where:

[0025] A - The force on the permanent magnet in the direction of the 0° angle, positive outward;

[0026] C - The force on the permanent magnet in the direction of the 240° angle, positive outward;

[0027] The values of A and B can be obtained by solving the equations. Based on the parameters of the magnetic ring and the permanent magnet, the change in the power supply parameters of the No. 1 magnetic ring and the No. 3 magnetic ring is calculated, and the parameters for supplying power to the magnetic ring are adjusted.

[0028] Furthermore, it also includes step 8: After power supply compensation, the vibration sensor continuously monitors the vibration of the shaft. If it is detected that the compensation is insufficient / excessive, further adjustment is made by increasing / decreasing the power supply current of the magnetic ring to keep the dynamic unbalance of the shaft within an allowable lower level.

[0029] Furthermore, the direction of applying the push / pull force to the shaft at the pasting position is specifically to apply the push / pull force radially inward / outward along the shaft.

[0030] Furthermore, in step 1, the two end positions are specifically the connection and support parts, and the middle position is specifically the part with the largest bending vibration deformation.

[0031] Furthermore, in step 2, the circumferential angular spacing of the three permanent magnets is 120°, specifically the three cross-sections of 0°, 120°, and 240°.

[0032] Furthermore, in step 6, if the vibration sensor at the middle position detects that there is an unbalanced mass of 1 g on the shaft in the X° angular direction, where X° is 0 - 30°, an outward pulling force of 10 N needs to be compensated.

[0033] Furthermore, in step 7, compensation is performed by different combinations of magnetic rings in other angular ranges, and the calculation method is the same.

[0034] Furthermore, the power supply parameters include the magnitude and direction of the current.

[0035] The beneficial effects of this application are as follows:

[0036] The present invention designs a non-contact automatic dynamic balance device for a rotating shaft. Compared with the prior art, it can implement automatic dynamic balance compensation for different cross-sections of the shaft with the least impact on the rotating shaft, has high sensitivity, and is convenient for installation and maintenance.

[0037] Different from the traditional mechanical automatic balancing device, which requires a relatively large-sized, heavy-weight and complex-structured device to be installed on the shaft, the device used in the present invention only pastes a relatively small-sized permanent magnet on the shaft body, with a simple structure, high reliability and good operability, and less restricted in engineering applications.

[0038] For the traditional mechanical structure automatic balancing device, when a specific amount of unbalance occurs on the shaft, its compensation amount is specific. If the internal structure or parameters of the device change, not only can it not effectively compensate, but it may even deteriorate the dynamic unbalance of the shaft. The device used in the present invention can not only dynamically compensate in a timely manner according to the actual dynamic unbalance detection result of the shaft, but also further compensate by adjusting the magnitude of the magnetic ring power supply current after the device parameters change (such as: the magnetic induction intensity of the permanent magnet decreases). It can also monitor the motion state of the shaft and the change of the dynamic unbalance degree through the change of the actual compensation current. When the compensation amount reaches the set value, it can also give an alarm reminder to avoid malfunction situations, with considerable safety benefits. Brief Description of the Drawings

[0039] Figure 1 is a schematic diagram of a typical slender shaft-like part;

[0040] Figure 2 is a schematic diagram of the overall installation structure of the device of the present invention;

[0041] Figure 3 is a detailed structural schematic diagram of the device of the present invention at a certain part where dynamic balance compensation is required;

[0042] Figure 4 are the main component parts of the device of the present invention, where:

[0043] 1 - permanent magnet; 2 - magnetic ring; 3 - controller;

[0044] Figure 5 is a schematic diagram of pasting the permanent magnet;

[0045] Figure 6 is a schematic diagram of installing the magnetic ring;

[0046] Figure 7 is a schematic diagram of connecting the controller;

[0047] Figure 8 is a schematic diagram of the automatic control principle. Detailed Embodiment

[0048] To make the purpose, technical solutions and advantages of the present invention more clear, the following will describe in more detail the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention. In the examples, the same or similar reference numerals throughout denote the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, of the embodiments of the present invention. The following exemplary embodiments described by reference are intended to explain the present invention and should not be construed as limiting the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. The following will be described in detail in combination with the embodiments of the present invention.

[0049] The permanent magnet is pasted on the rotating shaft. For specific parts that need to be compensated, it is pasted at 120° angular intervals on three adjacent cross-sections. By controlling the weight of the permanent magnet, static compensation is performed on the initial dynamic balance of the shaft. The magnetic ring is arranged outside the rotating shaft and consists of three rows of adjacent small electromagnet groups. For each part to be compensated, the three rows of small electromagnet groups and the three permanent magnets are correspondingly located at the same cross-section position. A vibration sensor is placed in the middle row of small electromagnet groups in the magnetic ring to monitor the dynamic unbalance amount and direction of the cross-section in real time. After the control system receives the measurement data of the vibration sensor, it calculates the angle and compensation amount that need to be compensated, calculates the magnetic force direction and magnitude required for the three permanent magnets according to the principle of force synthesis, and controls the current direction and intensity for powering the magnetic ring accordingly.

[0050] After the compensation is implemented, it is detected by the vibration sensor whether the dynamic unbalance amount of the shaft exceeds the allowable range, and further adjustment can be made on the basis of the current compensation.

[0051] The use and working process of the present invention are as follows (see appendix Figures 5 to 8 ):

[0052] ① According to the working state of the transmission shaft, select the parts for dynamic balance compensation. For example, select both ends and the middle part of the shaft (the part with the largest bending vibration deformation) as the parts for dynamic balance compensation. At a certain part, select three cross-sections (the cross-section spacing is the same as the spacing of the electromagnet groups in the magnetic ring) and paste one permanent magnet at each at 120° angular intervals. And according to the dynamic balance state of the shaft itself, select permanent magnets with appropriate weights for initial compensation. See appendix Figure 5 .

[0053] ② Install the magnetic ring outside the rotating shaft. Each column of electromagnet groups in the magnetic ring is at the same cross-section as the permanent magnet pasted on the shaft. And place one vibration sensor at the middle column of each magnetic ring. See appendix Figure 6 .

[0054] ③Connect the vibration sensor, magnetic ring to the controller, and define the 0° angular orientation, and number the permanent magnets and electromagnet groups accordingly. For example, the electromagnet groups and permanent magnets can be numbered 1-9 from left to right. See Appendix Figure 7 .

[0055] ④After the controller receives the detection data from the vibration sensor, it controls the power supply intensity of each column of electromagnet groups of each magnetic ring to adjust the magnetic field intensity. The process is as follows (see Appendix Figure 8 ):

[0056] Take one of the parts as an example, and the automatic adjustment principle and process of the remaining parts are the same.

[0057] 1) The vibration sensor continuously detects the vibration level and the angle where the vibration amplitude of the shaft is located at a certain part, and feeds it back to the controller. For example, the vibration sensor feeds back that the vibration amplitude is 1.2g and the angular direction is 60° (indicating that there is a certain mass eccentricity at the 60° angular position of this location).

[0058] 2) After the controller obtains the data from the vibration sensor, according to the data such as the structural dimensions and rotational speed of the shaft, it calculates the magnitude and direction of the magnetic force required for compensation. For example, the calculated required compensation force is 60N, and the compensation angle is in the 240° direction.

[0059] 3) According to the calculated magnitude and direction of the magnetic force to be compensated, it is decomposed into the forces on the permanent magnets in 3 directions. For example, to achieve a total magnetic force of 60N in the 240° direction, the 1# permanent magnet needs to be repelled (towards the inside of the shaft) by 30N, the 2# permanent magnet needs to be repelled by 30N, and the 3# permanent magnet needs to be attracted (towards the outside of the shaft) by 30N.

[0060] 4) According to the magnitude and direction of the magnetic forces on the permanent magnets decomposed, the current direction and power supply intensity are allocated to the 3 electromagnet groups according to the relevant parameters of the electromagnet groups.

[0061] 5) If under this compensation current, the dynamic unbalance of the shaft is reduced to the allowable level, then maintain this compensation current. If there is still remaining dynamic unbalance, then on this basis, the power supply current of the magnetic ring is adjusted through calculation by the controller until the dynamic balance of the shaft is reduced to the allowable level.

[0062] Embodiment

[0063] A non-contact dynamic balance automatic adjustment method is implemented based on a dynamic balance automatic adjustment device. The dynamic balance automatic adjustment device includes a vibration sensor, a permanent magnet, a magnetic ring, and a controller. The vibration sensor is used to monitor the mass eccentricity of a certain part of the shaft in real time. The permanent magnet is pasted on the shaft, and through the interaction between the magnetic ring and the permanent magnet, a pushing / pulling (inward / outward along the radial direction of the shaft) force can be applied to the shaft at the pasted part. The magnetic ring is externally powered to change the magnetic field size, and then a pushing / pulling force is applied to the permanent magnet within the magnetic field. The controller calculates the magnitude and direction of the power supply for each magnetic ring based on the data obtained from the vibration sensor to control the magnetic field of the magnetic ring in real time.

[0064] The steps for the dynamic balance automatic adjustment device to perform automatic adjustment are as follows:

[0065] Step 1: According to the structure and vibration characteristics of the transmission shaft, select the parts that need balance compensation. For example, for the transmission shaft shown in the figure, it is necessary to perform dynamic balance compensation on three parts: both ends (connection and support parts) and the middle (the part with the largest bending vibration deformation). Figure 1 For the transmission shaft shown, it is necessary to perform dynamic balance compensation on three parts: both ends (connection and support parts) and the middle (the part with the largest bending vibration deformation).

[0066] Step 2: Conduct an initial dynamic unbalance detection on the shaft, and record the initial unbalance amount and angular direction of each part. For example, through detection and calculation, the mass at the middle part of the shaft is 10 g heavier in the angular direction of 0°.

[0067] Step 2: Paste three identical permanent magnets on the shaft at each part that needs balance compensation in sequence. The axial spacing of these three permanent magnets is the same as the width of the magnetic ring, and the circumferential angular spacing is 120° (for example, three cross-sections at 0°, 120°, and 240° are numbered 1, 2, and 3 respectively). By controlling the weights of the permanent magnets in different angular directions, static compensation for the initial unbalance of the shaft is performed. For example, at the middle part of the shaft, the permanent magnet in the angular direction of 0° is 10 g heavier than the permanent magnets in the angular directions of 120° and 240°.

[0068] Step 3: At each part, place three magnetic rings outside the shaft corresponding to the permanent magnets, numbered 1, 2, and 3 corresponding to the permanent magnets.

[0069] Step 4: Install one vibration sensor at the middle magnetic ring of each group of magnetic rings.

[0070] Step 5: Connect the vibration sensor, the controller, and the magnetic rings.

[0071] Step 6: During the operation of the shaft, the mass eccentricity and angular direction of each part of the shaft are detected in real time through the vibration sensor. For example, the vibration sensor at the middle position detects that there is an unbalanced mass of 1 g in the angular direction of X° (0 - 30°) on the shaft, and an outward pulling force of 10 N needs to be compensated.

[0072] Step 7: Calculate the magnitude and direction of the current required to power each magnetic ring through the controller. For example, at the middle of the shaft, within the range of 0 - 30° of the mass eccentricity angular direction, compensation can be achieved by controlling the magnetic rings corresponding to the permanent magnets at the angular directions of 0° and 240° (compensation is performed by different combinations of magnetic rings in other angular ranges, and the calculation method is the same). The calculation formula is as follows:

[0073] A*cos(X)+C*cos(60 - X) = 10

[0074] A*sin(X)+C*sin(X) = 0

[0075] Where:

[0076] A - The force on the permanent magnet at the angular direction of 0° (positive outward)

[0077] C - The force on the permanent magnet at the angular direction of 240° (positive outward)

[0078] The values of A and B can be obtained by solving the equations. Based on the parameters of the magnetic rings and permanent magnets, calculate the change amounts of the power supply parameters (current magnitude and direction) of the No. 1 magnetic ring and No. 3 magnetic ring, and adjust the parameters of the power supply to the magnetic rings.

[0079] Step 8: After power supply compensation, the vibration sensor will continuously monitor the vibration of the shaft. If it is detected that the compensation is insufficient / excessive, further adjustment can be made by increasing / decreasing the power supply current of the magnetic ring to keep the dynamic unbalance of the shaft at a relatively low allowable level.

[0080] 1 Core inventive point: A method, based on a typical device, mainly composed of a permanent magnet fixed on a rotating shaft, a fixed magnetic ring surrounding the shaft, a dynamic balance monitoring device for the rotating shaft, and a control system.

[0081] 2 Secondary inventive point: The permanent magnet is pasted on the rotating shaft, similar to a traditional static balance weight, with little impact on the rotating shaft.

[0082] 3 Secondary inventive point: The pasted permanent magnet can perform initial compensation for the initial static mass unbalance of the rotating shaft.

[0083] 4 Secondary inventive point: The permanent magnets pasted on the rotating shaft are arranged at intervals of 120° in a circle at a certain cross-section, and the magnitude of the attraction / repulsion force on the permanent magnet can be controlled by adjusting the magnetic field strength to achieve compensation in any angular direction and magnitude.

[0084] 5 Secondary inventive point: Permanent magnets can be pasted on different cross-sections of the shaft as needed to perform dynamic balance compensation for specific cross-sections. For example, considering the first-order bending vibration to compensate the middle of the shaft, and considering the bearing support to compensate near the support point, etc.

[0085] 6 Minor inventive points: A magnetic ring is arranged off-axis, generating attractive / repulsive forces on the permanent magnet pasted on the shaft body. It does not contact the rotating shaft, avoiding scraping and wear, and also avoiding adverse effects on the rotating shaft and the equipment where it is located.

[0086] 7 Minor inventive points: The unbalance of the rotating shaft is compensated by magnetic force, and the compensation amount can be precisely controlled with uniform and stable force.

[0087] 8 Minor inventive points: Both the power supply and control system of the magnetic ring are fixed components, without considering the influence of rotation and additional structures such as friction rings, with high reliability.

[0088] 9 Minor inventive points: Through on-line dynamic balance monitoring of the shaft, the required compensation amount and compensation angle for a specific cross-section of the shaft are calculated. By controlling the magnetic field intensity of the fixed magnetic ring, the dynamic unbalance of the rotating shaft is compensated in a timely and effective manner.

[0089] 10 Minor inventive points: The magnetic rings placed at different cross-sections can respectively adjust their magnetic field intensities to meet the needs of different compensation amounts and compensation angles at different cross-sections of the rotating shaft.

[0090] 11 Minor inventive points: The operation process of this device does not require manual control, with timely compensation and high precision, avoiding product damage caused by human misoperation.

[0091] 12 Minor inventive points: There is only a fixed permanent magnet installed on the rotating part, with a simple structure, high reliability, and no need for maintenance.

[0092] 13 Minor inventive points: The magnetic ring is designed as a split docking structure, which can be installed and disassembled from both sides of the rotating shaft. The installation, replacement, and repair of the magnetic ring do not require the removal of the rotating shaft, with good maintainability.

[0093] 14 Minor inventive points: This device can track the change of the compensation current, monitor the change of the dynamic unbalance quality of the shaft, and give an alarm reminder for situations with a large degree of change or sudden change, timely detecting potential faults.

[0094] The device used in the present invention can achieve the purpose of automatic dynamic balance control under working conditions and equipment conditions where traditional automatic dynamic balance devices are difficult to implement, reducing the manufacturing and use and maintenance costs of equipment under such working conditions, with significant cost-effectiveness.

[0095] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the ordinary meanings understood by those of ordinary skill in the art to which this application pertains. The terms indicating directions such as "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", etc. used in the description of this application are only used to indicate relative directions or positional relationships, rather than implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, its relative positional relationship may also change accordingly. Therefore, it should not be construed as a limitation to this application. The terms "first", "second", "third", and similar terms used in the description of this application are only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The similar terms such as "a", "one", or "the" used in the description of this application should not be construed as an absolute limitation on the quantity, but should be understood as having at least one. The similar terms such as "including" or "comprising" used in the description of this application are intended to mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects.

[0096] In addition, it should be noted that, unless otherwise clearly specified and limited, the similar terms such as "installed", "connected", "joined" used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two components. Those skilled in the art can understand its specific meaning in this application according to the specific situation.

[0097] The above are only specific embodiments of the present invention and are not used to limit the present invention. Any person skilled in the art may, within the spirit and principle of the present invention, use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims

1. A non-contact dynamic balance automatic adjustment method, characterized in that It is implemented based on a dynamic balance automatic adjustment device, and the dynamic balance automatic adjustment device includes a vibration sensor, a permanent magnet, a magnetic ring and a controller; the vibration sensor is used to monitor the mass eccentricity of a certain part of the shaft in real time; the permanent magnet is pasted on the shaft, and through the interaction between the magnetic ring and the permanent magnet, a pushing / pulling force is applied to the shaft at the pasted part; the magnetic ring is externally powered to change the magnetic field size, and then a pushing / pulling force is applied to the permanent magnet within the magnetic field. Controller: By obtaining the data of the vibration sensor, calculate the magnitude and direction of the power supply for each magnetic ring to control the magnetic field of the magnetic ring in real time.

2. The method according to claim 1, characterized in that, The steps are as follows: Step 1: According to the structure and vibration characteristics of the transmission shaft, select the parts that need to be balanced and compensated. Step 2: Conduct an initial dynamic unbalance detection on the shaft, record the initial unbalance amount and angular direction of each part; at each part of the shaft that needs to be balanced and compensated, paste 3 identical permanent magnets in sequence; the axial spacing of these 3 permanent magnets is the same as the width of the magnetic ring, and the circumferential angular spacing is 120°, numbered 1, 2, and 3 respectively; through controlling the weights of the permanent magnets in different angular directions, static compensation is performed on the initial unbalance of the shaft. Step 3: At each part, place 3 magnetic rings corresponding to the permanent magnets outside the shaft, numbered 1, 2, and 3 corresponding to the permanent magnets. Step 4: Install 1 vibration sensor at the middle magnetic ring of each group of magnetic rings. Step 5: Connect the vibration sensor, the controller, and the magnetic ring. Step 6: During the operation of the shaft, use the vibration sensor to detect the mass eccentricity and angular direction of each part of the shaft in real time. Step 7: Through the controller, calculate the magnitude and direction of the current that needs to be supplied to each magnetic ring. For the middle part of the shaft, within the range where the mass eccentricity angle is 0 - 30°, compensation is performed by controlling the magnetic rings corresponding to the permanent magnets at the 0° and 240° angular directions. The calculation formulas are as follows: A*cos(X)+C*cos(60 - X) = 10 A*sin(X)+C*sin(X) = 0 Where: A - The force on the permanent magnet at the 0° angular direction, with the outward direction being positive. C - The force on the permanent magnet at the 240° angular direction, with the outward direction being positive. Calculate the values of A and B through the equations; calculate the change amounts of the power supply parameters of the No. 1 magnetic ring and the No. 3 magnetic ring through the parameters of the magnetic ring and the permanent magnet, and adjust the parameters of the power supply to the magnetic ring.

3. The method according to claim 2, characterized in that, In Step 1, for the transmission shaft, dynamic balance compensation needs to be performed on the two ends and the middle 3 parts; it also includes Step 8: After power supply compensation, the vibration sensor will continuously monitor the vibration of the shaft. If it is detected that the compensation is insufficient / excessive, further adjustment is made by increasing / decreasing the power supply current of the magnetic ring to make the dynamic unbalance of the shaft within an allowable and relatively low level.

4. The method according to claim 3, wherein The direction of applying the pushing / pulling force to the shaft at the pasted part is specifically to apply the pushing / pulling force radially inward / outward along the shaft.

5. The method according to claim 4, wherein In Step 1, the two end positions are specifically the connection and support parts, and the middle position is specifically the part with the largest bending vibration deformation.

6. The method according to claim 5, wherein In Step 2, the circumferential angular spacing of the 3 permanent magnets is 120°, specifically the three cross-sections of 0°, 120°, and 240°.

7. The method according to claim 6, characterized in that, In Step 6, if the vibration sensor at the middle position detects that there is an unbalanced mass of 1 g on the shaft at the M° angular direction, where M° is 0 - 30°, a pulling force of 10 N needs to be compensated outward.

8. The method according to claim 7, wherein In step 7, compensation is performed by different combinations of magnetic rings in other angular ranges, and the calculation method is the same.

9. The method according to claim 8, wherein The power supply parameters include the magnitude and direction of the current.

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