A simulation method for evaluating magnetically levitated blower rotor dynamics

Abstract

The present invention relates to a simulation method for evaluating the rotor dynamics of a magnetic levitation blower applied in the field of electronic digital data processing. The method comprises S1. constructing a model, S2. finite element equivalence, S3. three-dimensional statics simulation, S4. dynamic modal simulation, S5. predictive maintenance simulation and S6. completing the design. The method can effectively simplify the structure of a high-speed permanent magnet motor integrated rotor of a magnetic levitation blower, greatly reduce the mesh processing and calculation time costs, and also greatly reduce the difficulty of calculating the electromagnetic coupling field of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower. In addition, the method can utilize a predictive verification method after fault maintenance in different scenarios to effectively ensure the maintainability of the subsequent high-speed permanent magnet motor integrated rotor of the magnetic levitation blower in actual application and the operational safety guarantee function after maintenance, thereby providing an efficient and feasible solution for the design of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower.

Description

Technical Field

[0001] The present invention relates to a simulation method, in particular to a simulation method applied in the field of electronic digital data processing for evaluating the rotor dynamics of a magnetic suspension blower. Background Art

[0002] The original blower design featured a single-stage centrifugal impeller and an integrated rotor with a drive motor, supported by mechanical ball bearings. The high-speed permanent magnet motor in the current magnetic levitation blower is now replaced with a magnetic bearing. The influence of the impeller must also be considered in the rotor strength and dynamics design. Currently, magnetic levitation blowers offer a range of advantages, including zero friction, zero wear, low power consumption, long life, zero pollution, high speed, no lubrication required, and excellent sealing. The design of the high-speed permanent magnet direct-drive motor in a magnetic levitation blower differs significantly from that of conventional motors. As a key component, the rotor's structural design and strength analysis are crucial to the efficient and reliable operation of the high-speed motor.

[0003] However, as a high-speed rotating machine, the high-speed permanent magnet motor of the magnetic levitation blower is subject to huge centrifugal force loads, and its strength and dynamics must be verified. There are currently two calculation methods:

[0004] ① Transfer matrix method: It uses theoretical formulas for calculation without considering the influence of the rotor's mass distribution and inertia distribution on the rotor's motion, which affects the accuracy of the analysis results to a certain extent.

[0005] ② Finite element method: The finite element method can more accurately analyze the stress distribution of complex geometric shapes.

[0006] At high rotation speeds, severe vibration can occur due to imbalance. Therefore, rotor dynamics analysis, including critical speed analysis, must be performed at the outset of design. To ensure that the machine does not resonate within the operating speed range, the operating speed should be appropriately deviated from the critical speed to minimize the potential for severe damage to the rotor caused by resonance after certain excitations. The dynamic reliability of the rotor system is of great theoretical and practical significance for ensuring the safe, reliable, and long-term stable operation of the magnetic levitation blower rotor system.

[0007] However, the design of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower has many components, and the calculation of their coordination is cumbersome. The difficulty of the design is to optimize the rotor structure while meeting the functional requirements of these components to obtain a suitable controllable rotor dynamic characteristic and avoid the rotor resonance zone falling within the operating speed range. Therefore, the design of a high-speed permanent magnet motor integrated rotor for a magnetic levitation blower often has a long design cycle and high calculation difficulty, which is not conducive to the development and application of magnetic levitation blowers. In addition, after a failure occurs in the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower, its maintainability and safety data of subsequent applications are difficult to calculate and guarantee, which reduces the maintainability of the subsequent magnetic levitation blower high-speed permanent magnet motor integrated rotor application process and reduces its application safety. Summary of the Invention

[0008] In view of the above-mentioned existing technology, the technical problem to be solved by the present invention is how to shorten the design cycle of a high-speed permanent magnet motor integrated rotor for a magnetic levitation blower and reduce the calculation difficulty in the design process, as well as predict its maintainability and safety of application after maintenance, so as to ensure the safety of the high-speed permanent magnet motor integrated rotor for a magnetic levitation blower in subsequent applications.

[0009] To solve the above problems, the present invention provides a simulation method for evaluating the rotor dynamics of a magnetic levitation blower. The simulation method includes a dynamic simulation system mounted on a computer and specifically includes the following steps:

[0010] S1. Build the model,

[0011] Using the known impeller model, radial magnetic bearing, and axial magnetic bearing parameters, the impeller mass and moment of inertia, as well as the displacement stiffness of the radial magnetic bearing and axial magnetic bearing, are obtained. A three-dimensional model of the magnetic levitation blower rotor is constructed on a dynamic simulation system.

[0012] S2. Finite element equivalent,

[0013] The constructed three-dimensional model of the magnetic levitation blower rotor is preprocessed and meshed using a dynamic simulation system;

[0014] S3. 3D statics simulation,

[0015] The dynamics simulation system is used to perform a three-dimensional static simulation on the three-dimensional model of the magnetic suspension blower rotor after finite element equivalent, and the pressure distribution cloud map and deformation distribution cloud map are obtained;

[0016] Determine whether the load distribution and deformation on the three-dimensional model of the magnetic levitation blower rotor meet the material stress strength requirements;

[0017] If satisfied, proceed to step S4;

[0018] If not, the structure and size of the constructed three-dimensional model of the magnetic levitation blower rotor are optimized, and the process starts again from step S2;

[0019] S4. Dynamic modal simulation,

[0020] The dynamic simulation system is used to conduct dynamic modal simulation on the three-dimensional model of the magnetic suspension blower rotor that meets the material stress strength requirements, and the Campbell diagram is obtained;

[0021] Determine whether the applied speed of the magnetic levitation blower rotor three-dimensional model meets the critical speed safety range requirements;

[0022] If satisfied, proceed to step S5;

[0023] If not, the structure and size of the constructed three-dimensional model of the magnetic levitation blower rotor are optimized, and the process starts again from step S2;

[0024] S5. Predictive maintenance simulation,

[0025] The predictive maintenance simulation verification of the three-dimensional model of the magnetic levitation blower rotor that meets the critical speed safety range is carried out through the dynamic simulation system;

[0026] Perform maintenance tests on the 3D model of the magnetic levitation blower rotor in both normal and extreme scenarios to verify whether it can operate within the safe operating area.

[0027] If yes, proceed to step S6;

[0028] If not, then the structure and size of the constructed three-dimensional model of the magnetic levitation blower rotor are optimized, and then the process starts again from step S2;

[0029] S6. Complete the design,

[0030] When the statics, rotor dynamics, and maintenance simulations all meet the reliability and stability requirements, the dynamics simulation system outputs the three-dimensional model parameter data of the magnetic levitation blower rotor at this time, completing the design of the magnetic levitation blower rotor.

[0031] In the above-mentioned simulation method for evaluating the rotor dynamics of the magnetic levitation blower, the grid processing and calculation time costs can be greatly reduced, and the difficulty of calculating the electromagnetic coupling field of the integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower can be greatly reduced. It also effectively guarantees the maintainability of the subsequent integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower in actual application, as well as the operational safety guarantee after maintenance, providing an efficient and feasible solution for the design of the integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower.

[0032] As a supplement to this application, the three-dimensional model of the magnetic levitation blower rotor constructed in step S1 includes a rotating shaft, and the impeller model is installed at the right end of the rotating shaft, a permanent magnet is installed at the outer end of the rotating shaft, and an alloy sheath is installed at the outer end of the permanent magnet. Radial magnetic bearings are installed at both ends of the three-dimensional model of the magnetic levitation blower rotor, and an axial magnetic bearing located between the two radial magnetic bearings is installed at the outer end of the three-dimensional model of the magnetic levitation blower rotor, and the axial magnetic bearing is located on the right side of the permanent magnet. Interference fit is adopted between the rotating shaft and the permanent magnet, and between the permanent magnet and the alloy sheath, and the interference amount is 0.2mm~0.4mm.

[0033] As a supplement to this application, the specific method of model preprocessing and meshing the constructed three-dimensional model of the magnetic levitation blower rotor in step S2 is: equivalence of the effective elements of the rotating shaft, equivalence of point mass and moment of inertia for the impeller model set at the right end of the rotating shaft, equivalence of the radial magnetic bearing stiffness, and equivalence of 8 evenly distributed spring stiffnesses for the axial magnetic bearing.

[0034] As a supplement to the present application, in step S3, by setting the material properties and rotational speed of the three-dimensional model of the magnetic levitation blower rotor, the strain and stress parameters of the three-dimensional model of the magnetic levitation blower rotor are calculated, and its strength reliability is analyzed.

[0035] As a supplement to the present application, in step S4, the maximum simulation order is set to solve, the damping and Coriolis effect are turned on, and the Campbell diagram is output.

[0036] As a supplement to the present application, in step S4, the critical speed safety range is required to deviate from the critical speed by more than 20%.

[0037] As a further improvement of the present application, the dynamics simulation system includes an instruction parameter input unit, a three-dimensional model construction unit, a finite element equivalent processing unit, a three-dimensional static simulation unit, a dynamic modal simulation unit, a predictive maintenance simulation unit and a result output display unit;

[0038] The output end of the instruction parameter input unit is respectively connected to the three-dimensional model construction unit, the finite element equivalent processing unit, the three-dimensional static simulation unit, the dynamic modal simulation unit, the predictive maintenance simulation unit and the result display unit, and the input end of the instruction parameter input unit is connected to the signal input unit of the computer;

[0039] The input end of the result output display unit is respectively connected to the three-dimensional model construction unit, the finite element equivalent processing unit, the three-dimensional static simulation unit, the dynamic modal simulation unit and the predictive maintenance simulation unit, and the output end of the result output display unit is connected to the signal output unit of the computer;

[0040] The output end of the three-dimensional model construction unit is connected to the finite element equivalent processing unit signal, the output end of the finite element equivalent processing unit is connected to the three-dimensional static simulation unit signal, the output end of the three-dimensional static simulation unit is connected to the dynamic simulation unit signal, and the output end of the dynamic simulation unit is connected to the predictive maintenance simulation unit signal.

[0041] As a further improvement of the present application, the predictive maintenance simulation unit includes a predictive maintenance processing module, the input end of which is connected to the scenario selection module, the fault setting module, the maintenance degree setting module, and the performance evaluation standard module. The input end of the predictive maintenance processing module is also connected to the dynamic modal simulation unit signal, and the output end of the predictive maintenance processing module is connected to the conventional environment maintenance simulation module and the extreme environment maintenance simulation module.

[0042] The input ends of the scenario selection module, fault setting module, maintenance degree setting module and performance evaluation standard module are all connected to the instruction parameter input unit signal, and the output ends of the conventional environment maintenance simulation module and the extreme environment maintenance simulation module are all connected to the result output display unit signal.

[0043] As a further improvement and supplement to the present application, when the three-dimensional model of the magnetic suspension blower rotor that meets the critical speed safety range is subjected to predictive simulation verification in step S5;

[0044] S51. The predictive maintenance processing module first controls the conventional environment maintenance simulation module to perform a maintainability test on the three-dimensional model of the magnetic levitation blower rotor to determine the operating area of ​​the magnetic levitation blower rotor in different fault levels after maintenance under conventional conditions;

[0045] S52. If the three-dimensional model of the magnetic levitation blower rotor can operate within the safe operating area, execute step S6;

[0046] If the three-dimensional model of the magnetic levitation blower rotor cannot operate within the safe operating area, the structure and size of the constructed three-dimensional model of the magnetic levitation blower rotor are optimized, and the process is restarted from step S2;

[0047] S53. The predictive maintenance processing module then controls the extreme environment maintenance simulation module to perform a maintainability test on the three-dimensional model of the magnetic levitation blower rotor to determine the operating area of ​​the magnetic levitation blower rotor in different fault levels after maintenance under extreme conditions;

[0048] S54. If the three-dimensional model of the magnetic levitation blower rotor can operate within the safe operating area, execute step S6;

[0049] If the three-dimensional model of the magnetic levitation blower rotor cannot operate within the safe operating area, the structure and size of the constructed three-dimensional model of the magnetic levitation blower rotor are optimized, and then the process is restarted from step S2.

[0050] In summary, through the coordination of finite element equivalent, statics, dynamics and predictive maintenance simulation, the structure of the integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower can be effectively simplified, the grid processing and calculation time costs can be greatly reduced, and the difficulty of calculating the electromagnetic coupling field of the integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower can be greatly reduced, providing an efficient and feasible solution for the design of the integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower, and can use the predictive verification method after fault maintenance in different scenarios to effectively ensure the maintainability of the subsequent integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower in the actual application process, as well as the operational safety guarantee after maintenance, further promoting the feasibility of the design of the integrated rotor of the high-speed permanent magnet motor of the magnetic levitation blower. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a flow chart of the simulation method for the first to third embodiments of the present application;

[0052] Figure 2 This is a control logic diagram of the dynamics simulation system of the first to third embodiments of this application;

[0053] Figure 3 This is a logic diagram of the cooperation between the simulation method and the dynamics simulation system for the first to third embodiments of this application;

[0054] Figure 4 This is an axonometric view of a three-dimensional model of a magnetic levitation blower rotor according to the first to third embodiments of the present application;

[0055] Figure 5 This is an exploded view of the three-dimensional model of the magnetic levitation blower rotor according to the first to third embodiments of the present application;

[0056] Figure 6 This is a front cross-sectional view of a three-dimensional model of a magnetic levitation blower rotor according to the first to third embodiments of the present application;

[0057] Figure 7 This is a state diagram of the three-dimensional model of the magnetic levitation blower rotor in step S2 of the first to third embodiments of the present application;

[0058] Figure 8 This is a pressure distribution cloud diagram of the three-dimensional model of the magnetic levitation blower rotor in the first to third embodiments of this application;

[0059] Figure 9 This is a deformation distribution cloud diagram of the three-dimensional model of the magnetic levitation blower rotor in the first to third embodiments of this application;

[0060] Figure 10 The Campbell diagram is obtained in step S4 of the first to third embodiments of the present application.

[0061] Description of the numbers in the figure:

[0062] 1. 3D model of magnetic levitation blower rotor, 11. rotating shaft, 12. alloy sleeve, 13. permanent magnet, 2. radial magnetic bearing, 3. axial magnetic bearing. DETAILED DESCRIPTION

[0063] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0064] The first implementation method:

[0065] Figure 1 - Figure 10 A simulation method for evaluating the rotor dynamics of a magnetic levitation blower is shown. The simulation method includes a dynamic simulation system mounted on a computer and specifically includes the following steps:

[0066] S1. Build the model,

[0067] Using the known impeller model, radial magnetic bearing 2, and axial magnetic bearing 3 parameters, the impeller mass and moment of inertia, as well as the displacement stiffness of the radial magnetic bearing 2 and axial magnetic bearing 3, are obtained, and a three-dimensional model 1 of the magnetic levitation blower rotor is constructed on the dynamic simulation system.

[0068] S2. Finite element equivalent,

[0069] The constructed magnetic levitation blower rotor three-dimensional model 1 is preprocessed and meshed using a dynamic simulation system;

[0070] S3. 3D statics simulation,

[0071] A three-dimensional static simulation is performed on the three-dimensional model 1 of the magnetic suspension blower rotor after finite element equivalent using a dynamic simulation system to obtain a pressure distribution cloud map and a deformation distribution cloud map;

[0072] Determine whether the load distribution and deformation on the three-dimensional model 1 of the magnetic levitation blower rotor meet the required stress strength requirements of the material;

[0073] If satisfied, proceed to step S4;

[0074] If not, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model 1 are optimized, and the process starts again from step S2;

[0075] S4. Dynamic modal simulation,

[0076] A dynamic modal simulation is performed on a three-dimensional model 1 of a magnetic suspension blower rotor that meets the material stress strength requirements using a dynamic simulation system to obtain a Campbell diagram.

[0077] Determine whether the applied speed of the magnetic levitation blower rotor three-dimensional model 1 meets the critical speed safety range requirements;

[0078] If satisfied, proceed to step S5;

[0079] If not, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model 1 are optimized, and the process starts again from step S2;

[0080] S5. Predictive maintenance simulation,

[0081] The predictive maintenance simulation verification is performed on the three-dimensional model 1 of the magnetic levitation blower rotor that meets the critical speed safety range through the dynamic simulation system;

[0082] Perform maintenance tests on the magnetic levitation blower rotor three-dimensional model 1 under normal and extreme scenarios to verify whether the magnetic levitation blower rotor three-dimensional model 1 can operate within the safe operating area;

[0083] If yes, proceed to step S6;

[0084] If not, the structure and size of the constructed magnetic suspension blower rotor three-dimensional model 1 are optimized, and the process starts again from step S2;

[0085] S6. Complete the design,

[0086] When the statics, rotor dynamics, and maintenance simulations all meet the reliability and stability requirements, the dynamics simulation system outputs the parameter data of the three-dimensional model 1 of the magnetic levitation blower rotor at this time to complete the design of the magnetic levitation blower rotor. Through the coordination of finite element equivalence, statics, dynamics, and predictive maintenance simulations, it can effectively simplify the structure of the magnetic levitation blower high-speed permanent magnet motor integrated rotor, greatly reduce the mesh processing and calculation time costs, and greatly reduce the difficulty of calculating the electromagnetic coupling field of the magnetic levitation blower high-speed permanent magnet motor integrated rotor, providing an efficient and feasible solution for the design of the magnetic levitation blower high-speed permanent magnet motor integrated rotor. In addition, it can use the predictive verification method after fault maintenance in different scenarios to effectively ensure the maintainability of the subsequent magnetic levitation blower high-speed permanent magnet motor integrated rotor in actual application, as well as the operational safety guarantee after maintenance, further promoting the feasibility of the design of the magnetic levitation blower high-speed permanent magnet motor integrated rotor.

[0087] Figure 1 - Figure 6It is shown that the magnetic levitation blower rotor three-dimensional model 1 constructed in step S1 includes a rotating shaft 11, and the impeller model is installed at the right end of the rotating shaft 11, a permanent magnet 13 is installed at the outer end of the rotating shaft 11, and an alloy sheath 12 is installed at the outer end of the permanent magnet 13. Radial magnetic bearings 2 are installed at both ends of the magnetic levitation blower rotor three-dimensional model 1, and an axial magnetic bearing 3 located between the two radial magnetic bearings 2 is installed at the outer end of the magnetic levitation blower rotor three-dimensional model 1, and the axial magnetic bearing 3 is located on the right side of the permanent magnet 13. Interference fit is adopted between the rotating shaft 11 and the permanent magnet 13, as well as between the permanent magnet 13 and the alloy sheath 12, and the interference amount is 0.2mm~0.4mm. The interference fit setting effectively realizes a stable connection between the rotating shaft 11 and the permanent magnet 13, as well as between the permanent magnet 13 and the alloy sheath 12, ensures the positioning accuracy of the fit, promotes the uniformity of the load bearing, and ensures the load-bearing stability during the application of the magnetic levitation blower high-speed permanent magnet motor integrated rotor.

[0088] Figure 1 - Figure 10 It is shown that the specific method of model preprocessing and meshing the constructed magnetic levitation blower rotor three-dimensional model 1 in step S2 is: equivalent to the effective element of the rotating shaft 11, equivalent to the point mass M and the moment of inertia J of the impeller model arranged at the right end of the rotating shaft 11, equivalent to the stiffness of the radial magnetic bearing 2, and equivalent to the stiffness of 8 evenly distributed springs for the axial magnetic bearing 3. The point mass and moment of inertia of the impeller model are equivalent, which reduces the amount of mesh data, greatly reduces the amount of finite element solution calculation and time, and the stiffness of the radial magnetic bearing 2 is equivalent and the axial magnetic bearing 3 is equivalent to 8 evenly distributed springs. The difficulty of calculating the electromagnetic coupling between the rotating shaft 11, the radial magnetic bearing 2 and the axial magnetic bearing 3 is greatly reduced, thereby effectively promoting design efficiency.

[0089] Figure 1 - Figure 10 It is shown that in step S3, by setting the material properties and rotational speed of the magnetic levitation blower rotor three-dimensional model 1, the strain and stress parameters of the magnetic levitation blower rotor three-dimensional model 1 are calculated, and its strength reliability is analyzed. The calculation is performed based on the material properties and rotational speed, so as to effectively obtain the strain and stress data of the magnetic levitation blower rotor three-dimensional model 1 during the actual application process, thereby making a reliability judgment on the strength of the material, and selecting a suitable manufacturing material to ensure the application stability and reliability of the magnetic levitation blower high-speed permanent magnet motor integrated rotor.

[0090] Figure 1 - Figure 10 It is shown that in step S4, the maximum simulation order is set, the damping and Coriolis effect are turned on, and the Campbell diagram is output.

[0091] Figure 1 - Figure 10 It is shown that in step S4, the critical speed safety range is required to be 20% or more away from the critical speed.

[0092] Second implementation method:

[0093] Figure 1 - Figure 10 A simulation method for evaluating the rotor dynamics of a magnetic levitation blower is shown. The dynamic simulation system includes an instruction parameter input unit, a three-dimensional model building unit, a finite element equivalent processing unit, a three-dimensional static simulation unit, a dynamic modal simulation unit, a predictive maintenance simulation unit, and a result output display unit.

[0094] The output end of the instruction parameter input unit is respectively connected to the three-dimensional model construction unit, the finite element equivalent processing unit, the three-dimensional static simulation unit, the dynamic modal simulation unit, the predictive maintenance simulation unit and the result display unit, and the input end of the instruction parameter input unit is connected to the signal input unit of the computer;

[0095] The input end of the result output display unit is respectively connected to the three-dimensional model construction unit, the finite element equivalent processing unit, the three-dimensional static simulation unit, the dynamic modal simulation unit and the predictive maintenance simulation unit, and the output end of the result output display unit is connected to the signal output unit of the computer;

[0096] The output end of the three-dimensional model construction unit is connected to the signal of the finite element equivalent processing unit, the output end of the finite element equivalent processing unit is connected to the signal of the three-dimensional static simulation unit, the output end of the three-dimensional static simulation unit is connected to the signal of the dynamic simulation unit, and the output end of the dynamic simulation unit is connected to the signal of the predictive maintenance simulation unit. The setting of the dynamic simulation system can effectively realize the high-automatic and high-precision optimization design of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower, reduce the calculation difficulty, reduce the design cost, and effectively promote the continuity of the design and optimization of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower. It can optimize and guarantee the parameters of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower from three aspects: statics, dynamics and maintenance prediction, so as to ensure the feasibility and safety of the designed high-speed permanent magnet motor integrated rotor of the magnetic levitation blower.

[0097] Figure 2 and Figure 3 The predictive maintenance simulation unit includes a predictive maintenance processing module. The input end of the predictive maintenance processing module is connected to the scenario selection module, the fault setting module, the maintenance level setting module, and the performance evaluation standard module. The input end of the predictive maintenance processing module is also connected to the dynamic modal simulation unit signal. The output end of the predictive maintenance processing module is connected to the normal environment maintenance simulation module and the extreme environment maintenance simulation module.

[0098] The input ends of the scenario selection module, the fault setting module, the maintenance degree setting module and the performance evaluation standard module are all connected to the instruction parameter input unit signal, and the output ends of the conventional environment maintenance simulation module and the extreme environment maintenance simulation module are all connected to the result output display unit signal. The settings of the predictive maintenance processing module, the conventional environment maintenance simulation module and the extreme environment maintenance simulation module can, on the one hand, analyze and optimize the designed magnetic levitation blower high-speed permanent magnet motor integrated rotor according to the actual application data of the magnetic levitation blower high-speed permanent magnet motor integrated rotor, further promote the feasibility and effectiveness of the design of the magnetic levitation blower high-speed permanent magnet motor integrated rotor, thereby ensuring the subsequent maintainability of the magnetic levitation blower high-speed permanent magnet motor integrated rotor and the safety of subsequent operation.

[0099] Figure 2 and Figure 3 It shows that in step S5, the three-dimensional model 1 of the magnetic suspension blower rotor that meets the critical speed safety range is subjected to predictive simulation verification;

[0100] S51. The predictive maintenance processing module first controls the conventional environment maintenance simulation module to perform a maintainability test on the three-dimensional model 1 of the magnetic levitation blower rotor to determine whether the three-dimensional model 1 of the magnetic levitation blower rotor is in the operating area after maintenance at different fault levels under conventional conditions;

[0101] S52. If the magnetic levitation blower rotor three-dimensional model 1 can operate within the safe operating area, execute step S6;

[0102] If the magnetic levitation blower rotor three-dimensional model 1 cannot operate within the safe operating area, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model 1 are optimized, and the process is restarted from step S2;

[0103] S53. The predictive maintenance processing module then controls the extreme environment maintenance simulation module to perform a maintainability test on the magnetic levitation blower rotor three-dimensional model 1 to determine the operating area of ​​the magnetic levitation blower rotor three-dimensional model 1 after maintenance at different fault levels under extreme environments;

[0104] S54. If the magnetic levitation blower rotor three-dimensional model 1 can operate within the safe operating area, execute step S6;

[0105] If the magnetic levitation blower rotor three-dimensional model 1 cannot operate within the safe operating area, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model 1 are optimized, and then the execution is restarted from step S2. According to the maintainable fault data of the magnetic levitation blower high-speed permanent magnet motor integrated rotor, data analysis and judgment are performed according to different application environments after maintenance, so as to ensure the optimization of the design parameters of the magnetic levitation blower high-speed permanent magnet motor integrated rotor, fit the actual application scenario, and improve the feasibility of the design results.

[0106] Figure 1 - Figure 10 It is shown that in the process of design evaluation of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower, relevant technicians input unit data about relevant parameters and instructions of the design evaluation to the instruction parameter through the signal input unit of the computer, transmit known impeller model parameters, relevant parameters of the radial magnetic bearing 2 and the axial magnetic bearing 3 to the three-dimensional model construction unit through the instruction parameter input unit, input preprocessing parameters about the rotating shaft 11, point mass M and moment of inertia J data of the impeller model, and mesh division parameters to the finite element equivalent processing unit through the instruction parameter input unit, input material properties about the rotating shaft 11, alloy sheath 12 and permanent magnet 13 and speed data of the rotating shaft 11 to the three-dimensional static simulation unit through the instruction parameter input unit, and input data for solving the maximum simulation order and deviation from the critical speed range to the dynamic modal simulation unit through the instruction parameter input unit;

[0107] Relevant data on fault maintenance prediction verification are input into the predictive maintenance simulation unit through the instruction parameter input unit, relevant parameter data on maintenance degrees and maintenance effects of different faults are input into the maintenance degree setting module, environmental parameter data on conventional scenarios and extreme scenarios and relevant simulation verification instructions for the predictive maintenance simulation process are input into the scenario selection module, data on relevant faults occurring during the application of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower is input into the fault setting module, and the safety area range value of the application process of the high-speed permanent magnet motor integrated rotor of the magnetic levitation blower after fault maintenance is input into the performance evaluation standard module. After the maintenance degree setting module, the scenario selection module, the fault setting module and the performance evaluation standard module process and convert the data they receive, the input value is input to the predictive maintenance processing module to facilitate data verification control after fault maintenance;

[0108] The three-dimensional model construction unit constructs the magnetic levitation blower rotor three-dimensional model 1 according to the received data, and displays the magnetic levitation blower rotor three-dimensional model 1 to the signal output unit of the computer through the result output display unit. After the construction of the magnetic levitation blower rotor three-dimensional model 1 is completed, the relevant technical personnel obtain the signal output unit of the computer, and the control instruction parameter input unit transmits the working instruction to the finite element equivalent processing unit through the signal input unit on the computer, so that the finite element equivalent processing unit performs the effective element equivalent of the rotating shaft 11 according to the instruction and parameters, the point mass M and the moment of inertia J of the impeller model set at the right end of the rotating shaft 11, the stiffness of the radial magnetic bearing 2, and the stiffness of the axial magnetic bearing 3 with 8 evenly distributed springs;

[0109] After the finite element equivalent processing unit completes the model preprocessing and meshing of the magnetic levitation blower rotor three-dimensional model 1 through the result output display unit to the computer signal output unit, the relevant technical personnel transmit the work instructions to the three-dimensional static simulation unit through the signal input unit and the control instruction parameter input unit on the computer, so that the three-dimensional static simulation unit performs a three-dimensional static simulation on the magnetic levitation blower rotor three-dimensional model 1 processed by the finite element equivalent processing unit, obtains the pressure distribution cloud map and the deformation distribution cloud map, and judges whether the magnetic levitation blower rotor three-dimensional model 1 meets the material stress strength requirements. When the floating blower rotor three-dimensional model 1 does not meet the material stress strength requirements, the three-dimensional static simulation unit feeds back the unsatisfactory results to the result output display unit. After the relevant technicians obtain the results through the signal output unit of the computer, the three-dimensional model construction unit performs structural and dimensional optimization on the constructed magnetic levitation blower rotor three-dimensional model 1. Then, the finite element equivalent processing unit re-preprocesses and meshes the magnetic levitation blower rotor three-dimensional model 1 after the structural and dimensional optimization. The three-dimensional static simulation unit re-performs three-dimensional static simulation on the magnetic levitation blower rotor three-dimensional model 1 processed by the finite element equivalent processing unit.

[0110] When judging that the three-dimensional model 1 of the magnetic levitation blower rotor meets the stress strength requirements of the material, the three-dimensional static simulation unit outputs the results to the result output display unit and the three-dimensional static simulation unit respectively. After the relevant technicians display the results that meet the requirements through the signal output unit of the computer, the signal input unit on the computer controls the instruction parameter input unit to transmit the working instructions to the dynamic simulation unit, so that the dynamic simulation unit performs dynamic modal simulation on the three-dimensional model 1 of the magnetic levitation blower rotor after the three-dimensional static simulation, obtains the Campbell diagram, and judges whether the application speed of the three-dimensional model 1 of the magnetic levitation blower rotor meets the critical speed safety range requirements. When judging that the three-dimensional model 1 of the magnetic levitation blower rotor meets the critical speed safety range requirements, the three-dimensional model 1 of the magnetic levitation blower rotor is When the application speed does not meet the critical speed safety range requirements, the dynamic simulation unit will feed back the unsatisfactory results to the result output display unit. After the relevant technical personnel obtain the results through the signal output unit of the computer, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model 1 are optimized through the three-dimensional model construction unit. Then, the finite element equivalent processing unit re-preprocesses and meshes the magnetic levitation blower rotor three-dimensional model 1 after the structure and size optimization. The three-dimensional static simulation unit re-performs a three-dimensional static simulation on the magnetic levitation blower rotor three-dimensional model 1 processed by the finite element equivalent processing unit. The dynamic simulation unit re-performs a dynamic modal simulation on the magnetic levitation blower rotor three-dimensional model 1 that meets the requirements of the three-dimensional static simulation unit.

[0111] When it is judged that the three-dimensional model 1 of the magnetic levitation blower rotor meets the critical speed safety range requirements, the dynamic simulation unit outputs the results to the result output unit and the predictive maintenance processing module in the predictive maintenance simulation unit respectively. After the relevant technicians display the results that meet the requirements through the signal output unit of the computer, the signal input unit on the computer controls the instruction parameter input unit to transmit the work instructions and scenario selection sequence to the scenario selection module in the predictive maintenance simulation unit. After receiving the instructions and sequence selection data input by the scenario selection module, the predictive maintenance processing module transmits the simulation verification instructions and data to the extreme environment maintenance simulation module and the conventional environment maintenance simulation module in sequence according to the selection order, so that the extreme environment maintenance simulation module performs performance test verification on the three-dimensional model 1 of the magnetic levitation blower rotor after fault maintenance in extreme scenarios, and the conventional environment maintenance simulation module performs performance test verification on the three-dimensional model 1 of the magnetic levitation blower rotor after fault maintenance in conventional scenarios, and judges whether the test verification results can operate in the safe operating area. When judging whether the three-dimensional model of the magnetic levitation blower rotor 1. When the performance is not within the safe operating area after fault maintenance, a separate extreme environment maintenance simulation module, or a separate conventional environment maintenance simulation module, or both the extreme environment maintenance simulation module and the conventional environment maintenance simulation module transmit the result that is not within the safe operating area to the result output display unit. After the relevant technicians obtain the result through the signal output unit of the computer, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model 1 are optimized through the three-dimensional model construction unit. Then, the finite element equivalent processing unit re-preprocesses and meshes the magnetic levitation blower rotor three-dimensional model 1 after the structure and size optimization. The three-dimensional static simulation unit re-performs a three-dimensional static simulation on the magnetic levitation blower rotor three-dimensional model 1 processed by the finite element equivalent processing unit. The dynamic simulation unit re-performs a dynamic modal simulation on the magnetic levitation blower rotor three-dimensional model 1 that meets the requirements of the three-dimensional static simulation unit. The predictive maintenance processing module controls the extreme environment maintenance simulation module and the conventional environment maintenance simulation module to perform fault maintenance test verification in different scenarios on the magnetic levitation blower rotor three-dimensional model 1 that meets the requirements of the dynamic modal simulation.

[0112] When it is determined that the performance of the magnetic levitation blower rotor three-dimensional model 1 is within the safe operating area after fault maintenance, the extreme environment maintenance simulation module and the conventional environment maintenance simulation module transmit the results to the result output display unit, and the result output display unit displays the parameter data of the designed magnetic levitation blower rotor three-dimensional model 1 to relevant technical personnel through the signal output unit of the computer.

[0113] The third implementation method:

[0114] Figure 1 - Figure 10The simulation method for evaluating the rotor dynamics of a magnetically levitated blower is shown. The specific steps include:

[0115] S1. Build the model,

[0116] The operating speed of the rotating shaft 11 to be designed is 19000 rpm. The parameters of the impeller model, radial magnetic bearing 2, and axial magnetic bearing 3 are known. The impeller mass M is 10.5 kg, the moments of inertia Jx, Jy, and Jz are 63361 kg*mm2, 63361 kg*mm2, and 101516 kg*mm2, respectively. The displacement stiffness of the radial magnetic bearing 2 and the axial magnetic bearing 3 is 4.4 kN / 0.2 mm.

[0117] S2. Finite element equivalent,

[0118] like Figure 4 - Figure 7 As shown, the finite element equivalent of the rotating shaft 11 is performed, the impeller model is equivalent to the point mass M and the moment of inertia J, the displacement stiffness of the radial magnetic bearing 2 is equivalent to the bearing stiffness, and the displacement stiffness of the axial magnetic bearing 3 is equivalent to the stiffness of 8 evenly distributed springs. The three-dimensional model 1 of the magnetic levitation blower rotor is preprocessed and meshed. Interference fit is adopted between the rotating shaft 11 and the permanent magnet 13, as well as between the permanent magnet 13 and the alloy sheath 12, and the interference is 0.3 mm.

[0119] S3. 3D statics simulation,

[0120] Perform a three-dimensional static simulation, set the material of the shaft 11 to 40CrNiMoA, the material of the permanent magnet 13 to samarium cobalt, the material of the alloy sheath 12 to high-strength alloy steel 718, and the speed of the magnetic suspension blower rotor three-dimensional model 1 to 19000 rpm. Figure 8 and Figure 9 As shown in the figure, the pressure distribution cloud map and deformation distribution cloud map are calculated. The maximum stress of the shaft 11 is 507MPa, the maximum stress of the permanent magnet 13 is 102MPa, the maximum stress of the alloy sheath 12 is 770MPa, and the maximum deformation of the magnetic suspension blower rotor three-dimensional model 1 is 0.63mm. After analysis, the load distribution of each component meets the allowable stress strength requirements of the material.

[0121] S4. Dynamic modal simulation,

[0122] Perform dynamic modal simulation of the magnetic suspension blower rotor three-dimensional model 1, set the maximum modal order to be solved, turn on the damping and Coriolis effect, and output the Campbell diagram, such as Figure 10 As shown, the first-order critical speed is 23782 rpm, and the designed operating speed of the shaft 11 is 19000 rpm, which deviates from the first-order critical speed by more than 20%, meeting the normal working design requirements;

[0123] S5. Predictive maintenance simulation,

[0124] S51 performs a predictive maintenance simulation of a three-dimensional model of a magnetic levitation blower rotor, setting post-fault maintenance parameters for conventional and extreme environmental failures;

[0125] S52. In a normal environment, the operating temperature is 25°C and the operating humidity is 40%. The three-dimensional model of the magnetic levitation blower rotor after fault maintenance 1 operates within the safe operating area;

[0126] S53. In an extreme environment, operating temperature is 300°C, operating humidity is above 90%, and the three-dimensional model 1 of the magnetic levitation blower rotor after fault maintenance operates within the safe operating area;

[0127] S6. Complete the design,

[0128] Statics, rotor dynamics, and maintenance simulations all meet reliability and stability requirements, outputting parameter data for the three-dimensional model 1 of the magnetic levitation blower rotor and completing the design.

[0129] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A simulation method for evaluating the rotor dynamics of a magnetic levitation blower, characterized by: The simulation method includes a dynamics simulation system mounted on a computer, and specifically includes the following steps: S1. Build the model, Using the known impeller model, radial magnetic bearing (2) and axial magnetic bearing (3) parameters, the impeller mass and moment of inertia, as well as the displacement stiffness of the radial magnetic bearing (2) and the axial magnetic bearing (3) are obtained, and a three-dimensional model (1) of the magnetic suspension blower rotor is constructed on a dynamic simulation system; S2. Finite element equivalent, The constructed magnetic suspension blower rotor three-dimensional model (1) is preprocessed and meshed by a dynamic simulation system; S3. 3D statics simulation, A three-dimensional static simulation is performed on the three-dimensional model (1) of the magnetic suspension blower rotor after finite element equivalent by a dynamic simulation system to obtain a pressure distribution cloud map and a deformation distribution cloud map; Determine whether the load distribution and deformation on the three-dimensional model (1) of the magnetic levitation blower rotor meet the material stress strength requirements; If satisfied, proceed to step S4; If not, the structure and size of the constructed magnetic suspension blower rotor three-dimensional model (1) are optimized, and the process is restarted from step S2; S4. Dynamic modal simulation, The dynamic modal simulation of the three-dimensional model (1) of the magnetic suspension blower rotor that meets the material stress strength requirements is performed through a dynamic simulation system to obtain a Campbell diagram; Determine whether the applied speed of the magnetic suspension blower rotor three-dimensional model (1) meets the critical speed safety range requirement; If satisfied, proceed to step S5; If not, the structure and size of the constructed magnetic suspension blower rotor three-dimensional model (1) are optimized, and the process is restarted from step S2; S5. Predictive maintenance simulation, The predictive maintenance simulation verification is performed on the three-dimensional model (1) of the magnetic suspension blower rotor that meets the critical speed safety range through the dynamic simulation system; Performing maintenance tests on the magnetic levitation blower rotor three-dimensional model (1) under normal and extreme scenarios to verify whether the magnetic levitation blower rotor three-dimensional model (1) can operate within a safe operating area; If yes, proceed to step S6; If not, the structure and size of the constructed magnetic suspension blower rotor three-dimensional model (1) are optimized, and the process is restarted from step S2; S6. Complete the design, When the statics, rotor dynamics and maintenance simulations all meet the reliability and stability requirements, the dynamics simulation system outputs the parameter data of the magnetic levitation blower rotor three-dimensional model (1) at this time, completing the design of the magnetic levitation blower rotor.

2. A simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 1, characterized in that: The dynamics simulation system includes an instruction parameter input unit, a three-dimensional model building unit, a finite element equivalent processing unit, a three-dimensional static simulation unit, a dynamic modal simulation unit, a predictive maintenance simulation unit and a result output display unit; The output end of the instruction parameter input unit is respectively connected to the three-dimensional model construction unit, the finite element equivalent processing unit, the three-dimensional static simulation unit, the dynamic modal simulation unit, the predictive maintenance simulation unit and the result display unit, and the input end of the instruction parameter input unit is connected to the signal input unit of the computer; The input end of the result output display unit is respectively connected to the three-dimensional model construction unit, the finite element equivalent processing unit, the three-dimensional static simulation unit, the dynamic modal simulation unit and the predictive maintenance simulation unit, and the output end of the result output display unit is connected to the signal output unit of the computer; The output end of the three-dimensional model construction unit is connected to the finite element equivalent processing unit signal, the output end of the finite element equivalent processing unit is connected to the three-dimensional static simulation unit signal, the output end of the three-dimensional static simulation unit is connected to the dynamic simulation unit signal, and the output end of the dynamic simulation unit is connected to the predictive maintenance simulation unit signal.

3. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 2, characterized in that: The predictive maintenance simulation unit includes a predictive maintenance processing module, an input end of which is connected to a scenario selection module, a fault setting module, a maintenance degree setting module, and a performance evaluation standard module. The input end of the predictive maintenance processing module is also connected to a dynamic modal simulation unit signal, and the output end of the predictive maintenance processing module is connected to a conventional environment maintenance simulation module and an extreme environment maintenance simulation module. The input ends of the scenario selection module, fault setting module, maintenance degree setting module and performance evaluation standard module are all connected to the instruction parameter input unit signal, and the output ends of the conventional environment maintenance simulation module and the extreme environment maintenance simulation module are all connected to the result output display unit signal.

4. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 3, characterized in that: When the three-dimensional model (1) of the magnetic suspension blower rotor that meets the critical speed safety range is subjected to predictive simulation verification in step S5; S51. The predictive maintenance processing module first controls the operation of the conventional environment maintenance simulation module, so that the conventional environment maintenance simulation module performs a maintainability test on the magnetic levitation blower rotor three-dimensional model (1), and determines whether the magnetic levitation blower rotor three-dimensional model (1) is in an operating area after maintenance of different fault degrees under a conventional environment; S52. If the three-dimensional model of the magnetic levitation blower rotor (1) can operate within the safe operating area, execute step S6; If the magnetic levitation blower rotor three-dimensional model (1) cannot operate within the safe operating area, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model (1) are optimized, and the process is restarted from step S2; S53. The predictive maintenance processing module controls the operation of the extreme environment maintenance simulation module, so that the extreme environment maintenance simulation module performs a maintainability test on the three-dimensional model (1) of the magnetic levitation blower rotor, and determines the operating area of ​​the three-dimensional model (1) of the magnetic levitation blower rotor after maintenance at different fault levels under the extreme environment; S54. If the three-dimensional model of the magnetic levitation blower rotor (1) can operate within the safe operating area, execute step S6; If the magnetic levitation blower rotor three-dimensional model (1) cannot operate within the safe operating area, the structure and size of the constructed magnetic levitation blower rotor three-dimensional model (1) are optimized, and then the process is restarted from step S2.

5. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 1, characterized in that: The magnetic levitation blower rotor three-dimensional model (1) constructed in step S1 includes a rotating shaft (11), and the impeller model is installed at the right end of the rotating shaft (11), the outer end of the rotating shaft (11) is installed with a permanent magnet (13), the outer end of the permanent magnet (13) is installed with an alloy sleeve (12), the left and right ends of the magnetic levitation blower rotor three-dimensional model (1) are both installed with radial magnetic bearings (2), the outer end of the magnetic levitation blower rotor three-dimensional model (1) is installed with an axial magnetic bearing (3) located between the two radial magnetic bearings (2), and the axial magnetic bearing (3) is located on the right side of the permanent magnet (13), and the rotating shaft (11) and the permanent magnet (13) and the alloy sleeve (12) are both interference fit, and the interference amount is 0.2mm to 0.4mm.

6. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 5, characterized in that: In step S2, the specific method of performing model preprocessing and meshing on the constructed magnetic suspension blower rotor three-dimensional model (1) is as follows: equivalent to the effective element of the rotating shaft (11), equivalent to the point mass and moment of inertia of the impeller model arranged at the right end of the rotating shaft (11), equivalent to the stiffness of the radial magnetic bearing (2), and equivalent to the stiffness of 8 evenly distributed springs for the axial magnetic bearing (3).

7. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 1, characterized in that: In step S3, the material properties and rotational speed of the magnetic levitation blower rotor three-dimensional model (1) are set, the strain and stress parameters of the magnetic levitation blower rotor three-dimensional model (1) are calculated, and its strength reliability is analyzed.

8. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 1, characterized in that: In step S4, the maximum simulation order is set, damping and Coriolis effect are turned on, and the Campbell diagram is output.

9. The simulation method for evaluating rotor dynamics of a magnetic levitation blower according to claim 1, characterized in that: In step S4 , the critical speed safety range is required to be more than 20% away from the critical speed.

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