Optimization Design And Analysis Of Multi-Physical Field Coupling Of Aero High Energy Permanent Magnet Machine

In recent years,as the new energy industry continues to develop,the advancement of electric aircraft also continues to rise at the same pace,followed by growing demands of the industries related to all-electric aircraft.The avionics system of electric aircraft is of tremendous significance to the entire aircraft.In particular,the main power system is the key part of the avionics system.The application to a new industry sets up high requirements and stimulates new design thoughts for the main drive motor.Electric aircraft require high energy density from the main driving motor,especially given that the insulation and efficiency criteria can be well guaranteed,having the highest possible power density,torque density,and fault-tolerance can also be of great assistance.In light of this,the study on the multi-physical field coupling of high-energy permanent-magnet electric motor is crucial.This paper studied the electromagnetic field and finite element simulation analysis of the high-energy motor.Based on the actual working environment of all-electric aircraft,the power system and its components were analyzed,including the question of how the power system of all-electric aircraft deals with parameter matching.For the high-energy permanent-magnet motor,the structure and working principle were roughly described,and the electromagnetic field theory and parsing process were established.Its preliminary design and electromagnetic field simulation analysis were then completed based on the finite element theory.The optimization design of multi-physical field coupling was then completed based on the Firefly Algorithm to obtain the optimal energy density.For the said motor,the basic theory of temperature field and fluid field were studied,after which the basic theory of heat transfer and fluid field were established to analyze and calculate the main heat sources.ANSYS was then used to establish the temperature-fluid coupling analysis process and obtain the results of basic temperature simulation and temperature-fluid coupling analysis during parsing.In the following,the mechanical and stress fields of the high-energy electric motor were studied,and the basic theory during the mechanical analysis was established,including the basic strength theory and the rotor dynamics theory.The analysis focused on its optimization design of electromagnetic and mechanical coupling,and the simulation analysis was conducted for the strength stress of important motor parts,as well as for the strength and electromagnetic coupling.A curve was then drawn to illustrate the relationship among the yoke thickness,yoke flux density,and deformation rate.The innovation of this thesis lies in:1)the analysis of the power demands of such machine and the establishment of the parameter model of the power system;2)the provision of the preliminary design thoughts and electromagnetic field analysis process;3)the focus given to the analysis of the coupling of the temperature field and the fluid field as well as the strength-electromagnetic coupling process,to eventually use the Firefly Algorithm to verify the 10.4%improvement of the energy density indicator.The experiment platform for the high-energy permanent-magnet electric motor was then built,and the experiment results showed that the energy density of the developed motor has reached 14.85kW·Nm/kg~2.