Performance Research And Response Surface Optimization Of Disk Permanent Magnetic Coupling

Permanent magnetic coupling can realize the contactless power transmission between motor and load,and has the advantages of flexible starting,vibration reduction,high transmission efficiency and wide speed range.The main work of this paper focuses on the theoretical,experimental research and structural optimization of disk permanent magnetic coupling.The torque characteristics of three types of disk permanent magnetic coupling are studied and optimized.At the same time,the steady-state temperature distribution of the disk permanent magnetic coupling with standard structure is obtained through experiment and multi-physical field coupling simulation.The specific contents include:First,the experimental platform and the prototype of the disk permanent magnetic coupling are designed,and the analytical modeling,finite element simulation of electromagnetic field and experimental research of transmission torque of the prototype are further completed.The comparison among the analytical,simulation and experimental results proves that the method of finite element simulation of electromagnetic field can accurately predict the transmission characteristics of disk permanent magnetic coupling;meanwhile,through the coupling simulation of magnetic field,temperature field and fluid,the steady-state temperature distribution of the prototype is obtained,and the comparison with the experimental results shows the accuracy of the multi-physical field coupling simulation results.Second,the finite element simulation of electromagnetic field is used as a tool,with the volume of permanent magnet as the constraint condition and the transmission torque as the optimization objective,the response surface optimization of the disk permanent magnetic couplings with standard structure,copper plate slotted topology and Halbach permanent magnet array with copper plate slotted topology is carried out respectively;at the same time,the influence of the structure parameters such as the thickness of the permanent magnet and the number of magnetic poles on the transmission torque of the standard type disk permanent magnetic coupling is studied,and the contribution rates of the geometric size of the permanent magnet to the transmission torque are analyzed by Taguchi method,the contribution rates from high to low are height,width and thickness of the permanent magnet;for the disk permanent magnetic coupling with copper plate slotted topology,the influence of the slot radial length,slot number and other structural parameters on the transmission torque is also studied;for the disk permanent magnetic coupling with Halbach permanent magnet array and copper plate slotted topology,the influence of main pole ratio and auxiliary pole magnetization angle of Halbach array on transmission torque is studied.Finally,the response surface optimization results of three types of disk permanent magnetic coupling are compared.The results show that: response surface methodology can be used to optimize the transmission performance of the disk permanent magnetic coupling very effectively;the copper plate with slotted topology can improve the transmission torque greatly,but it will also introduce the cogging torque which affects the transmission stability;the Halbach permanent magnet array structure with reasonable design can further improve the transmission torque and greatly reduce the cogging torque caused by the slotting of the copper disk.The cost of permanent magnet in disk permanent magnetic coupling is high,and the response surface optimization research in this paper can significantly improve the utilization of permanent magnet materials.At the same time,the temperature distribution of the disk permanent magnetic coupling is obtained by multiple physical field coupling simulation,and verified by experiments.