Electromagnetic Characteristic Analysis And Parameter Optimization Of Flux Concentrated Permanent Magnet Eddy Current Coupler

Permanent magnet eddy current coupler(PMECC)is able to transfer torque between two shafts without any mechanical contact,which brings the advantages of high reliability,wide speed-regulating,and so on.PMECC can significantly promote the overall efficiency of drive system with a load of pump or fan by speed governing.In this thesis,a flux concentrated PMECC(FC-PMECC)is proposed,and its electromagnetic characteristics and temperature field are analyzed.The electromagnetic optimization design of the proposed coupling is also carried out,based on which a corresponding software is developed.The work presented herein can be used as a reference in the engineering design and further research and development for this type of coupler.This thesis introduces the structure type and the operation principle of PMECC at first,and then summarizes its research status and the developing trend at home and abroad.Afterwards,a novel FC-PMECC is proposed to improve torque density.The flux concentrated effect is enhanced by inserting flux barriers in the PM-side rotor core,which reduces the magnetic flux leakage,thereby promoting PM utilization and output torque simultaneously.An analytical model for FC-PMECC is established by using the magnetic equivalent circuit(MEC)method.The accuracy of the analytical model is verified by three-dimensional finite element analysis(3D FEA).In addition,the influences of the key structural parameters on the torque improvement are numerically analyzed,based on which the general selection rule of the flux barrier sizes under different PM thicknesses is summarized.The parameters of FC-PMECC are optimized based on response surface methodology(RSM)and its algorithm combined with weight improved particle swarm optimization(RSM-WPSO).The temperature field analysis of FC-PMECC is also investigated.A mathematical model for its transient field is presented,and the coupled electromagnetic-thermal simulation is carried out by FEA.A novel flux concentrated double-layer PMECC(FCD-PMECC)is proposed to solve the local overheating problem in the conductor cylinder during speed adjusting operation.It is conductive to improve the output torque and meanwhile shorten the axial length of the coupler,thereby expanding its application areas.Finally,an electromagnetic design and optimization software for PMECC based on Borland C++ Builder 6.0 compile environment is developed.The software contains several modules including electromagnetic analysis,parameterized calculation,optimizing design and temperature field analysis.It combines the achievements of this thesis to provide an efficient automatic design and analysis tool,which has the advantages of friendly interface,quick and convenient operation and so on.