Traction motor bearing device embedded with permanent magnet and use method thereof

Abstract

The invention provides a traction motor bearing device embedded with a permanent magnet and a use method thereof, and relates to the technical field of electrified rail transit, the traction motor bearing device comprises a high-speed motor train unit, a traction motor, a bearing and a permanent magnet, the traction motor is arranged at the bottom of the high-speed motor train unit; the bearing is arranged on a rotating shaft of the traction motor, the center line of the bearing and the center line of the traction motor are located at the same position, and lubricating grease is arranged on the bearing; the permanent magnets are arranged on the bearing, at least one group of permanent magnets are arranged, and the permanent magnets are in contact with the lubricating grease. According to the invention, not only can the bearing damage caused by electrocorrosion be effectively reduced, but also the influence on the lubricating performance of the bearing can be reduced through the filtering and purifying process.

Description

Technical Field

[0001] The present invention relates to the technical field of electrified rail transit, and more particularly, to a traction motor bearing device embedded with permanent magnets and a method of using the same. Background Art

[0002] With the rapid development of high-speed railways in China, the traction motor, as an important component of high-speed trains, has become one of the key technologies to ensure the smooth and safe operation of trains. However, the bearings of traction motors face the problem of electro-corrosion during long-term operation, especially the shaft voltage caused by common-mode voltage. This voltage forms a current path through the stator windings of the motor and stray capacitance, resulting in a voltage difference between the inner and outer rings of the bearing, and further causing problems such as electro-corrosion, overheating, and noise. To solve this problem, the existing technologies mainly focus on reducing external common-mode voltage and rotor ground current, and usually adopt methods such as insulating bearings, electrostatic shielding, and low-impedance branches for treatment. Although these methods can effectively reduce the influence of some currents, they are ineffective in removing iron filings in the clean lubricating grease, reducing the conductivity of the lubricating grease, and improving the service life of the bearings. In addition, most of the existing solutions are aimed at controlling external currents, and there is a relative lack of purification treatment technology inside the motor bearings, resulting in a large number of protection measures relying on external equipment and being unable to fundamentally solve the electro-corrosion problem caused by shaft voltage.

[0003] Therefore, there is an urgent need for a traction motor bearing device embedded with permanent magnets and a method of using the same to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a traction motor bearing device embedded with permanent magnets and a method of using the same to improve the above problems. To achieve the above purpose, the technical solutions adopted by the present invention are as follows: In a first aspect, the present application provides a traction motor bearing device embedded with permanent magnets, including: a high-speed multiple unit, a traction motor, a bearing, and a permanent magnet. The traction motor is arranged at the bottom of the high-speed multiple unit; the bearing is arranged on the rotating shaft of the traction motor, the center line of the bearing is located at the same position as the center line of the traction motor, and lubricating grease is arranged on the bearing; the permanent magnet is arranged on the bearing, at least one group of permanent magnets is provided, and the permanent magnet is in contact with the lubricating grease.

[0005] Optionally, the bearing includes an outer bearing ring and an inner bearing ring, and at least one group of through holes is arranged on the outer bearing ring for fixing the permanent magnet.

[0006] Optionally, an insulating layer is arranged on the surface of the outer bearing ring.

[0007] Optionally, an on-vehicle magnetic monitoring sensor is further provided at the bottom of the high-speed multiple unit, and the on-vehicle magnetic monitoring sensor is used to monitor the magnetic field strength of the permanent magnet in real time.

[0008] Optionally, the material of the permanent magnet is neodymium iron boron material.

[0009] In a second aspect, the present application also provides a method for using a traction motor bearing device embedded with a permanent magnet, including: Obtaining first information, where the first information includes the angular velocity information of the bearing rotation, the distance information between the permanent magnet installation position and the bearing center point, and the mass information of a single permanent magnet; Calculating the unbalance amount of the bearing installed with a preset number of permanent magnets based on a dynamic balancing machine and the first information, and determining the installation number of the permanent magnets based on the calculated unbalance amount of each bearing; Based on the on-vehicle magnetic monitoring sensor to monitor the magnetic field strength of the permanent magnet in real time, performing filtering processing on the magnetic field strength of the permanent magnet, and determining whether the magnetic field strength of the permanent magnet after filtering processing is greater than a preset threshold. If it is greater than the preset threshold, take out the bearing for cleaning.

[0010] The beneficial effects of the present invention are as follows: By embedding a permanent magnet inside the bearing to adsorb metal impurities in the grease and reduce the conductivity of the grease, the present invention effectively extends the service life of the bearing. Specifically, by designing a bearing embedded with a permanent magnet and using a magnetic monitoring sensor to monitor the magnetic field strength of the permanent magnet in real time, and combining dynamic balancing technology to ensure the reasonable configuration of the number of permanent magnets, the cleaning of iron filings inside the bearing is realized. This method can not only effectively reduce the bearing damage caused by electrocorrosion, but also reduce the impact on the lubrication performance of the bearing through the process of filtration and purification, fundamentally improving the reliability and service life of the bearing. At the same time, this method can reduce the maintenance cost and improve the safety of train operation.

[0011] Other features and advantages of the present invention will be described in the subsequent description, and, in part, will become obvious from the description, or can be understood by implementing the embodiments of the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written description, claims, and drawings. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 Schematic structural diagram of the bearing device of the traction motor with embedded permanent magnets in the embodiments of the present invention; Figure 2 Schematic installation position diagram of the bearing device of the traction motor with embedded permanent magnets in the embodiments of the present invention; Figure 3 Schematic diagram of the permanent magnet embedding position of the bearing device of the traction motor with embedded permanent magnets in the embodiments of the present invention; Figure 4 Schematic flow diagram of the usage method of the bearing device of the traction motor with embedded permanent magnets in the embodiments of the present invention; Figure 5 Schematic diagram of the on-vehicle magnetic monitoring sensor of the bearing device of the traction motor with embedded permanent magnets in the embodiments of the present invention.

[0014] Markings in the figure: 1, traction motor; 2, bearing; 3, permanent magnet; 4, bearing outer ring; 5, bearing inner ring; 6, through hole; 7, insulating layer; 8, magnetic monitoring sensor. Detailed implementation manners

[0015] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of 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 protection scope of the present invention.

[0016] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0017] Embodiment 1: Refer to Figure 1 , Figure 2 , Figure 3 and Figure 5, this embodiment provides a bearing device for a traction motor with embedded permanent magnets, including: a high-speed EMU, a traction motor 1, a bearing 2, and a permanent magnet 3. The traction motor 1 is arranged at the bottom of the high-speed EMU; the bearing 2 is arranged on the rotating shaft of the traction motor 1, the center line of the bearing 2 and the center line of the traction motor 1 are located at the same position, and grease is provided on the bearing 2; the permanent magnet 3 is arranged on the bearing 2, at least one group of permanent magnets 3 is provided, and the permanent magnet 3 is in contact with the grease.

[0018] It can be understood that the structure of the bearing 2 includes a high-speed EMU, a traction motor 1, a bearing 2, and a permanent magnet 3. Specifically, the traction motor 1 is arranged at the bottom of the high-speed EMU, and the bearing 2 is installed on the rotating shaft of the traction motor 1, and the center line of the bearing 2 is aligned with the center line of the traction motor 1 to ensure the stable operation of the bearing 2. Grease is provided on the bearing 2 to reduce friction and improve the operating efficiency of the bearing 2. To solve the problem of electrical corrosion of the bearing 2, the permanent magnet 3 is designed to be embedded in the bearing 2, and at least one group of permanent magnets 3 is included. These permanent magnets 3 are in contact with the grease. Through this structural design, the permanent magnet 3 can magnetically adsorb metal impurities in the grease, reduce the conductivity of the grease, thereby reducing the generation of shaft current, extending the service life of the bearing 2, and improving the reliability of the traction motor 1.

[0019] Among them, the bearing 2 includes a bearing outer ring 4 and a bearing inner ring 5. At least one group of through holes 6 is provided on the bearing outer ring 4, and the through holes 6 are used to fix the permanent magnet 3.

[0020] It can be understood that by providing the through holes 6 on the bearing outer ring 4, it can ensure that the permanent magnet 3 is firmly embedded in the bearing outer ring 4, so as to ensure that the permanent magnet 3 can stably contact the grease during the operation of the bearing 2 and play its role of magnetically adsorbing metal impurities. This structural design not only enhances the contact effect between the permanent magnet 3 and the grease, but also ensures the stability and long-term reliable operation of the bearing 2.

[0021] Among them, an insulating layer 7 is provided on the surface of the bearing outer ring 4.

[0022] It can be understood that in the present invention, by covering a layer of insulating material on the surface of the bearing outer ring 4, it can effectively isolate the current conduction between the bearing outer ring 4 and the external electrical system, and reduce the problem of electrical corrosion caused by the current flowing through the bearing outer ring 4. This structural design enables the current in the electrical system not to affect the normal operation of the bearing 2, and reduces the damage and failures caused by electrical reasons.

[0023] Among them, a magnetic monitoring sensor 8 is further provided at the bottom of the bogie of the high-speed multiple unit. The magnetic monitoring sensor 8 is used to monitor the magnetic field intensity of the permanent magnet 3 in real time and upload it to the on-vehicle magnetic monitoring display device on the high-speed multiple unit.

[0024] It can be understood that in this step, through the magnetic monitoring sensor 8, the change of the magnetic field intensity of the permanent magnet 3 can be continuously tracked, and the monitored data can be transmitted to the on-vehicle magnetic monitoring device to ensure that it maintains sufficient magnetic field intensity during the working process, so as to effectively adsorb metal impurities in the grease. When the magnetic field intensity of the permanent magnet 3 changes, especially when the adsorbed impurities are close to saturation, the monitoring device will send an alarm or an indication signal to prompt that maintenance or cleaning is required. This real-time monitoring system can greatly improve the predictability and accuracy of the maintenance of the bearing 2, avoid the risk of affecting the purification effect of the bearing 2 due to insufficient magnetic field intensity, help to maintain the long-term stable operation of the bearing 2, reduce the occurrence of faults and extend the service life of the equipment.

[0025] Among them, the material of the permanent magnet 3 is neodymium iron boron material.

[0026] It can be understood that in this step, neodymium iron boron is a high-performance rare earth permanent magnet material with extremely high magnetic energy product and magnetic field intensity. Compared with other magnetic materials, it has stronger magnetic force and can generate a larger magnetic field in a smaller volume. This material can effectively enhance the magnetic field intensity of the permanent magnet 3, thereby improving its ability to adsorb metal impurities in the grease. The high magnetic properties of the neodymium iron boron material enable the permanent magnet 3 to stably maintain sufficient magnetic field intensity during the working process of the bearing 2, ensuring the purification effect of the grease. In addition, the neodymium iron boron material has good oxidation resistance and corrosion resistance, and can also maintain stable performance in the high-temperature and high-humidity working environment of the high-speed multiple unit, further improving the reliability and service life of the bearing 2 of the traction motor 1.

[0027] Embodiment 2: As Figure 4 shown, this embodiment provides a use method of a traction motor bearing device embedded with a permanent magnet, including step S1, step S2 and step S3.

[0028] Step S1: Obtain the first information, where the first information includes the angular velocity information of the bearing rotation, the distance information between the installation position of the permanent magnet and the center point of the bearing, and the mass information of a single permanent magnet; It is understandable that obtaining the first information is to provide basic data for subsequent bearing balance adjustment and determination of the number of permanent magnet installations. The angular velocity information of the bearing rotation can be obtained in real time through sensors installed on the bearing, which is crucial for understanding the dynamic state of the bearing operation. Angular velocity is a key parameter for measuring the rotation rate of the bearing, which can reflect the load condition of the bearing during operation, and further help to judge whether the bearing is in a normal working state or there is abnormal vibration, thus affecting the configuration and working effect of the permanent magnet. The distance information between the installation position of the permanent magnet and the center point of the bearing is a detailed analysis of the influencing factors of the magnetic field distribution of the permanent magnet. Under the action of the magnetic field, the interaction between the permanent magnet and the bearing will affect the adsorption of metal impurities in the grease, so this information is directly related to the installation effect of the permanent magnet.

[0029] Step S2: Calculate the unbalance of the bearing with a preset number of permanent magnets installed based on the dynamic balancing machine and the first information, and determine the number of permanent magnets to be installed based on the calculated unbalance of each bearing; It is understandable that in this step, by precisely adjusting the number and distribution of the permanent magnets, not only can the vibration and noise caused by unbalance be reduced, but also the fluidity and lubrication effect of the grease can be improved, and the risks of wear and corrosion can be reduced. This step improves the running stability and reliability of the bearing system, ensures that the bearing can maintain a low vibration level during long-term operation, thereby extending the service life of the equipment and improving the overall stability of the system. In this step, step S2 includes step S21 and step S22.

[0030] Step S21: Stably install the bearing to be monitored for unbalance on the dynamic balancing machine, successively test the bearings with different numbers of permanent magnets embedded, and calculate based on the preset unbalance calculation formula to obtain the unbalance of each bearing with permanent magnets embedded; It is understandable that in this step, by gradually adjusting the number of permanent magnets and combining with the dynamic balancing machine for detection, the compensation effect of the installation of the permanent magnet on the bearing unbalance can be accurately evaluated. Finally, through this series of experiments, an optimized permanent magnet configuration scheme can be obtained to ensure that the bearing reaches the best balance state during operation, reduce the vibration and wear problems caused by unbalance, and improve the stability and service life of the equipment. In this step, the preset unbalance calculation formula is as follows: ; Where, is the mass of the permanent magnet to be added (unit: gram), is the unbalance of the bearing (unit: gram·millimeter), is the radius of the installation position of the permanent magnet (unit: millimeter), is the angular velocity of the bearing (unit: radian / second).

[0031] Step S22: Compare the unbalance amounts of the bearings with embedded permanent magnets pairwise, and select the number of embedded permanent magnets corresponding to the bearing with the smallest unbalance amount as the installation quantity of the permanent magnets for each bearing.

[0032] It can be understood that through systematic comparison and optimization in this step, the optimal installation quantity can be screened out from multiple permanent magnet configuration schemes. By this method, the vibration and instability phenomena caused by unbalance can be effectively eliminated, and the reliability of equipment operation can be improved. In practical applications, the selection of this scheme can not only improve the equipment performance, but also reduce the maintenance cost, and reduce the potential failures caused by unbalance, ensuring the stable operation of high-speed EMUs.

[0033] Step S3: Based on the on-vehicle magnetic monitoring sensor, monitor the magnetic field intensity of the permanent magnet in real time, perform filtering processing on the magnetic field intensity of the permanent magnet, and determine whether the magnetic field intensity of the permanent magnet after filtering processing is greater than a preset threshold. If it is greater than the preset threshold, take out the bearing for cleaning.

[0034] It can be understood that through real-time monitoring and filtering processing, it is possible to accurately judge whether the permanent magnet is working properly, thereby preventing potential equipment failures. By promptly discovering problems and performing cleaning and maintenance, the operation stability and safety of high-speed EMUs can be significantly improved, reducing the failures and maintenance costs caused by abnormal permanent magnets, and ensuring the efficient and reliable operation of the entire system. In this step, Step S3 includes Step S31 and Step S32.

[0035] Step S31: Combine the discrete magnetic field intensities of the permanent magnet obtained by the on-vehicle magnetic monitoring sensor into a set to obtain a discrete intensity set. It can be understood that this step combines the discrete magnetic field intensity data into a set, which not only makes the data more systematic and standardized, but also facilitates further processing. For example, statistical analysis can be performed based on this set to calculate parameters such as the average magnetic field intensity and standard deviation, and evaluate the volatility and stability of the magnetic field intensity. This provides a solid data foundation for subsequent filtering processing, anomaly detection, and fault prediction, thus ensuring the accuracy and reliability of the monitoring results.

[0036] Step S32: Send the discrete intensity set to a preset Gaussian filtering model for processing, where the weighted average value of all data in the discrete intensity set is calculated to obtain the magnetic field intensity after filtering.

[0037] It can be understood that the magnetic field intensity data after Gaussian filtering in this step can effectively remove the noise components in the discrete data, making the signal smoother. The filtered magnetic field intensity data can more accurately reflect the real magnetic field state, thus providing a more accurate basis for subsequent judgment on whether the bearing needs to be cleaned. If the original discrete intensity data contains high-frequency noise or abnormal fluctuations, after the smoothing process of Gaussian filtering, the system can more accurately identify whether there are abnormalities or faults. In this step, step S32 includes step S321, step S322, and step S323.

[0038] Step S321: Calculate the cumulative distribution value of the discrete intensity set based on a preset Gaussian function, and calculate the weighted vector corresponding to each data in the discrete intensity set through a weight calculation formula; It can be understood that through the cumulative distribution value and weighted vector calculated based on the Gaussian function in this step, weights can be more reasonably assigned to each data point, ensuring that the correlation and local trend between data points are effectively retained. This process not only eliminates the accidental errors of individual data points, but also strengthens the representative magnetic field intensity data through weighted averaging, improving the accuracy and stability of the overall data.

[0039] Step S322: Normalize all the weighted vectors corresponding to the data to obtain the normalized weighted vectors; It can be understood that the processing of the normalized weighted vectors effectively avoids the deviation caused by different dimensions of the weighted values, ensuring that the contribution of each data point to the final result is calculated proportionally, thus improving the calculation accuracy of the system. The technical effect of normalization is to enhance the reliability of data processing, ensure that the filtering result of the magnetic field intensity can more accurately reflect the actual situation, avoid the influence of a single outlier on the filtering result, and finally make the filtered data smoother and unbiased, providing more accurate data support for subsequent magnetic field intensity judgment and equipment maintenance.

[0040] Step S323: Calculate the weighted average value of the normalized weighted vectors based on a preset average value calculation formula, and use it as the filtered magnetic field intensity.

[0041] It can be understood that through the calculation of the weighted average value, it is ensured that the filtering result of the magnetic field intensity is smoother, more accurate, and noise-reduced. This method improves the accuracy of magnetic field intensity detection by reasonably processing the normalized data, ensuring that the filtered data is not affected by noise or extreme data, and finally obtaining an accurate and reliable magnetic field intensity value. This filtered magnetic field intensity value will provide an accurate basis for subsequent judgment on whether to remove the bearing for cleaning, ensuring the stability of the system and the reliability of operation.

[0042] Among them, step S3 further includes step S33, step S34, and step S35.

[0043] Step S33: If it is determined that the magnetic field strength of the permanent magnet after filtering processing is greater than the preset threshold, it is determined that the impurities adsorbed by the permanent magnet are full; It can be understood that the magnetic field strength of the permanent magnet in this step will be affected by the amount of impurities adsorbed on its surface. When the permanent magnet adsorbs a certain amount of impurities, its surface will become more complex. These impurities may be metal particles or other magnetic substances. Due to the magnetic properties of these impurities, the magnetic field strength of the permanent magnet will increase. Especially when the adsorption is saturated, the magnetic field strength will significantly exceed the normal value. By monitoring the magnetic field strength, it is possible to effectively prevent the performance degradation of the permanent magnet caused by excessive adsorption of impurities, ensure the normal operation of the equipment, and extend the service life of the permanent magnet. At the same time, this step can intelligently judge the cleaning time without manual intervention, thereby improving work efficiency and equipment automation.

[0044] Step S34: Then take out the bearing and record the installation positions and sequences of the components that need to be disassembled for removing the bearing; It can be understood that this step ensures a standardized and safe disassembly process and can accurately restore the original installation state. By recording the installation positions and sequences of the disassembled components, the system can smoothly reassemble the bearing and other components in the correct order after disassembly and cleaning, avoiding installation problems caused by incorrect disassembly sequences. This method effectively improves the efficiency of the maintenance and repair process, reduces the risk of performance degradation of the equipment caused by human errors, and thus ensures the high efficiency and stability of the equipment during long-term operation. In addition, through accurate recording, reliable data support can be provided for later maintenance, facilitating regular inspections and continuous optimization.

[0045] Step S35: Fix the taken-out bearing on a fixing frame, install an electromagnet on the outer side of the outer ring of the bearing, energize the electromagnet, and the magnetic field generated by the electromagnet sucks out the permanent magnet embedded in the bearing, and then replace and re-embed the permanent magnet.

[0046] It can be understood that in this step, through the magnetic field action of the electromagnet, the permanent magnet in the bearing can be taken out and replaced efficiently and quickly, thus ensuring the effective operation of the permanent magnet. This method avoids the possible damage caused by manual removal compared with traditional replacement methods. By re-embedding the permanent magnet, the magnetic field characteristics of the equipment can be restored, improving the overall operation efficiency and stability of the equipment. At the same time, the automation process of this process reduces the complexity and risk of manual operation, improves the efficiency of equipment maintenance, and ensures the stability and high efficiency of the equipment during long-term operation.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0048] As described above, these are only the specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or replacements, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A bearing device for a traction motor with embedded permanent magnets, characterized in that, Comprising: High-speed multiple unit train; A traction motor (1), the traction motor (1) being arranged at the bottom of the high-speed multiple unit train; A bearing (2), the bearing (2) being arranged on the rotating shaft of the traction motor (1), the center line of the bearing (2) being located at the same position as the center line of the traction motor (1), and a grease being provided on the bearing (2); A permanent magnet (3), the permanent magnet (3) being arranged on the bearing (2), at least one group of the permanent magnets (3) being provided, and the permanent magnet (3) being in contact with the grease.

2. The bearing device of the traction motor with embedded permanent magnets according to claim 1, characterized in that Comprising: The bearing (2) includes a bearing outer ring (4) and a bearing inner ring (5), at least one group of through holes (6) being provided on the bearing outer ring (4), and the through holes (6) being used for fixing the permanent magnet (3).

3. The traction motor bearing device with embedded permanent magnets according to claim 2, characterized in that, Comprising: An insulating layer (7) is provided on the surface of the bearing outer ring (4).

4. The bearing device of the traction motor with embedded permanent magnets according to claim 1, characterized in that Comprising: A vehicle-mounted magnetic monitoring sensor (8) is further arranged at the bottom of the high-speed multiple unit train, and the vehicle-mounted magnetic monitoring sensor (8) is used for monitoring the magnetic field intensity of the permanent magnet (3) in real time.

5. The bearing device of the traction motor with embedded permanent magnets according to claim 1, characterized in that, Comprising: The material of the permanent magnet (3) is neodymium iron boron material.

6. A method for using a bearing device of a traction motor with embedded permanent magnets, characterized in that, Comprising: Obtain first information, the first information including the angular velocity information of the bearing rotation, the distance information between the permanent magnet installation position and the bearing center point, and the mass information of a single permanent magnet; Based on a dynamic balancing machine and the first information, calculate the unbalance amount of the bearing installed with a preset number of permanent magnets, and determine the installation number of the permanent magnets based on the unbalance amount of each calculated bearing; Based on the vehicle-mounted magnetic monitoring sensor, monitor the magnetic field intensity of the permanent magnet in real time, perform filtering processing on the magnetic field intensity of the permanent magnet, and judge whether the magnetic field intensity of the permanent magnet after filtering processing is greater than a preset threshold. If it is greater than the preset threshold, take out the bearing for cleaning.

7. The method for using the traction motor bearing device embedded with permanent magnets according to claim 6, characterized in that, Based on a dynamic balancing machine and the first information, calculating the unbalance amount of the bearing installed with a preset number of permanent magnets includes: Stably install the bearing to be monitored for unbalance amount on the dynamic balancing machine, successively test the bearings embedded with different numbers of permanent magnets, and calculate based on a preset unbalance amount calculation formula to obtain the unbalance amount of each bearing embedded with a permanent magnet; Compare the unbalance amounts of each bearing embedded with a permanent magnet pairwise, and select the number of embedded permanent magnets corresponding to the bearing with the smallest unbalance amount as the installation number of the permanent magnets for each bearing.

8. The method for using a bearing device of a traction motor with embedded permanent magnets according to claim 6, characterized in that, Based on the vehicle-mounted magnetic monitoring sensor, monitoring the magnetic field intensity of the permanent magnet in real time and performing filtering processing on the magnetic field intensity of the permanent magnet includes: Merge the discrete magnetic field intensities of the permanent magnet obtained by the vehicle-mounted magnetic monitoring sensor into a set to obtain a discrete intensity set; Send the discrete intensity set to a preset Gaussian filtering model for processing, wherein the weighted average value of all data in the discrete intensity set is calculated to obtain the filtered magnetic field intensity.

9. The method of using the traction motor bearing device embedded with permanent magnets according to claim 8, characterized in that, The sending the discrete intensity set to a preset Gaussian filtering model for processing includes: Calculate the cumulative distribution value of the discrete intensity set based on a preset Gaussian function, and calculate the weighted vector corresponding to each data in the discrete intensity set through a weight calculation formula; Perform normalization processing on the weighted vectors corresponding to all data to obtain the normalized weighted vector; Calculate the weighted average of the normalized weighted vector based on a preset average value calculation formula, and use it as the filtered magnetic field intensity.

10. The method of using a traction motor bearing device embedded with a permanent magnet according to claim 6, characterized in that, And judge whether the mass of impurities adsorbed by the permanent magnet is greater than a preset threshold based on the magnetic field intensity of the permanent magnet after filtering. If it is greater than the preset threshold, take out the bearing for cleaning, including: If it is judged that the magnetic field intensity of the permanent magnet after filtering is greater than the preset threshold, it is judged that the impurities adsorbed by the permanent magnet are full; Then take out the bearing, and record the installation positions and sequences of the components that need to be disassembled to take out the bearing; Fix the taken-out bearing on a fixing frame, and install an electromagnet on the outside of the outer ring of the bearing. Energize the electromagnet, and the magnetic field generated by the electromagnet sucks out the permanent magnet embedded in the bearing, and then replace and re-embed the permanent magnet.

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