Design And Analysis Of A Novel Asymmetric-Stator-Pole Hybrid Excited Flux Reversal Machine

The flux reversal permanent magnet machine(FRPM)is a typical stator permanent magnet(PM)synchronous machine.In addition to the inherent advantages of traditional PM machine such as high torque density/efficiency,and operational reliability,it also has the advantages of simple rotor structure,strong robustness and suitability for AC brushless operation.Besides,FRPM machine has broad application prospects in the field of electric vehicles.In order to expand its range of speed regulation,this thesis proposes a new type of asymmetric-stator-pole hybrid excited flux reversal(ASP-HEFR)machine by introducing the design concept of "asymmetric stator consequent pole" and installing DC field windings on the non-PM excitation teeth.This thesis takes the new ASP-HEFR machine as the research object to investigate its basic principle,design optimization,electromagnetic performance,and experimental verification.The main contributions of this thesis include the following aspects:(1)Introduce the research background and significance of this thesis,give a detailed overview of the current development status of FRPM machines and hybrid excited machines at domestic and abroad,as well as clarify the innovative thoughts and structural arrangements of this thesis.(2)Describe and explain the typical structure and the operation principle of the proposed ASPHEFR machine,as well as study and reveal the flux regulation mechanism of the proposed machine based on the “variable harmonics” theory.(3)Investigate the electromagnetic design of the new ASP-HEFR machine,establish its parametric model,perform multi-objective global optimization and single parameter optimization analysis,determine the prototype design,as well as investigate and summarize the influence of key design parameters on the electromagnetic performance.(4)Compare and analyze the electromagnetic characteristics of the two different ASP-HEFR machines with 12/17-and 12/16-stator slot/rotor tooth under the condition of the same overall size.Summarize the electromagnetic performance differences between the odd-number and evennumber tooth structures.The results show that the proposed 12/17-stator slot/rotor tooth machine has higher torque and better flux adjusting capability.(5)Manufacture the 12/17-stator slot/rotor tooth ASP-HEFR machine prototype,as well as test and analyze the main electromagnetic characteristics of the prototype under different DC field excitation to verify the feasibility of the proposed design.The research work in this thesis provides a theoretical and technical basis for the further research and engineering application of the hybrid excited flux reversal machine.