Analytical Calculation And Design Optimization Of Axial-flux Permanent Magnet Eddy Coupling

This paper mainly focuses on the analysis of the characteristics,the establishment of the layered analytic model of electromagnetic field and the optimization of electromagnetic torque and axial force of the axial-flux permanent magnet eddy coupling.Firstly,the basic theories of the analytical models of electromagnetic field of axial-flux permanent magnet eddy coupling and radial-flux permanent magnet eddy coupling are studied.As to the radial-flux permanent magnet eddy coupling,the analytical model based on equivalent magnetic circuit is introduced,emphatically;when it comes to the axial-flux permanent magnet eddy coupling,the analytical model based on one-dimensional equivalent magnetic circuit is introduced.The rationality and deficiency of the above analytical models are illustrated by the results of three dimensional finite element simulation.Secondly,the characteristics of the surface-mounted axial-flux permanent magnet eddy coupling is analyzed,and the layered analytical model is established.By combining the three dimensional equivalent magnetic circuit method with Faraday's law and Ampere's law,the layered electromagnetic analysis model of the axial-flux permanent magnet eddy coupling is established.The layered analytical model can effectively deal with the complex geometry model and influences of 3D parameters of model.Based on the analytical model,the effects of the material of the conductor layer,the thickness of the conductor layer and the number of analytic layer are discussed.Results of three dimensional finite element simulation show that the analytical model established in this paper has a high analytical accuracy within a certain range.Finally,the electromagnetic torque and axial force of axial-flux permanent magnet eddy coupling are optimized.The effects of the thickness of the permanent magnet,the thickness of the air gap,the thickness of the conductor layer and the slip on the electromagnetic torque and axial force of the axial-flux permanent magnet eddy coupling are studied.Based on the analysis of simulation results,the parameters which significantly affect the electromagnetic torque and axial force are selected by the Taguchi-method,and then the response surface equations of electromagnetic torque and axial force on these parameters are established by the response surface methodology.Consulting the response surface equations,the fitting values of parameters and predictive values of the objective functions are given by the response optimizer.