| Magnetic drive stirring device is a stirring device that uses magnetic coupling to transfer power.Its static sealing and zero leakage characteristics can meet the safety and environmental protection requirements in recent vaccine research and production.This article combines the physical and model of a magnetic drive stirring device,and analyzes and studies the structural and magnetic field characteristics of the magnetic drive stirring device from two aspects of mechanical performance and magnetic torque performance using finite element simulation software and experiments.Finally,based on the analysis of structural and magnetic field characteristics,the optimization design of the magnetic coupling part of the magnetic drive stirring device was carried out,providing a reference for the design of the magnetic drive stirring device in the future.The main content and achievements of the study are as follows:(1)Ideal models of coaxial and disc magnetic drive devices were established using Maxwell3 D software,and the torque and magnetic torque characteristics of coaxial and disc magnetic drive devices were simulated and analyzed.Obtain the working characteristics of coaxial and disc magnetic drive devices.(2)A mechanical performance analysis was conducted on the model,and the effects of shell elements and hexahedral elements on the stiffness of the model were compared.The conclusion was drawn that using shell elements would increase the overall structural stiffness of the model.By comparing the stress,displacement and natural frequency under different bearing configurations and different spacer ring thickness,it is concluded that the bearing configuration of 6005 Deep Groove Ball Bearing and 3204 double row angular contact ball bearing can reduce the radial displacement of the mixing shaft,and finally the appropriate spacer ring thickness is determined for subsequent magnetic torque performance analysis.(3)The analytical method,two-dimensional finite element analysis method,and threedimensional finite element analysis method were used to analyze the parameter model of the experimental prototype.The advantages and disadvantages of the three methods were compared,and the relationship between the three methods and the torque values measured by the prototype was obtained.Finally,the three-dimensional finite element analysis method was selected for subsequent model optimization analysis.(4)A three-dimensional model of a magnetic driven stirring device was established in Maxwell3 D software,and the parameters that affect the magnetic torque characteristics were analyzed separately to obtain the impact of these parameters on the magnetic torque when they change separately.Through analysis,a set of more optimized magnet parameter configurations than the initial parameters was obtained.(5)An experimental design analysis of a magnetic drive mixer was conducted using Ansys Workbench in conjunction with Maxwell3 D module.A response surface model was established to evaluate the accuracy of the response surface model.Based on the response surface model,multi-parameter optimization analysis was conducted to obtain the optimized parameter configuration.Compared with the parameter combination before optimization,the use of permanent magnets reduced the volume by 18.70% and increased the magnetic torque density by 10.23%.Finally,the results of multi-parameter analysis under different torque constraints were summarized and concluded as follows: 1)The volume of the inner permanent magnet needs to be similar to that of the outer permanent magnet.2)Under the condition of maximum size constraint,when the constraint torque increases,it is necessary to sacrifice some of the yoke thickness to increase the size of the permanent magnet.3)The outer diameter of the outer yoke iron and the axial length of the permanent magnet are close to the maximum available size. |
