Design And Simulation Of High Power Density Permanent Magnet Synchronous Motor For More Electric Aircraft

High power density permanent magnet synchronous motor(PMSM)has been widely used in the field of more electric aircraft(MEA).However,the improvement of power density of MEA drive motor is limited by material performance,cooling system and aviation operation environment.Therefore,the research on high reliability and high power density drive motor has important theoretical significance and practical engineering value for the development of MEA.In the paper,the basic design theory and the initial design scheme of the motor are given.The method of improving the power density of motor is given based on the design theory,namely,the application of high speed,high electromagnetic load and lightweight structure design.The initial design schemes are determined based on the 6-slot/8-pole and 12-slot/10-pole combination.The initial design schemes are optimized and the final optimized scheme that meets the design requirements is determined.The motor is parametric modeling based on Ansoft software.The initial models are optimized in many aspects,such as stator groove,permanent magnet,core back yoke thickness and lightweight structure.The model with 12-slot/10-pole combination is adopted as the best design scheme.According to the distribution of magnetic flux density,the basis of lightweight structure design of stator and rotor is given.The electromagnetic characteristics and temperature field distribution of the optimized model are analyzed.The electromagnetic properties including flux and induced electromotive force(EMF),air gap flux density,inductance,torque and loss.Temperature field simulation is mainly based on Motor-CAD software.The cooling structures including housing heat sink and single-end shaft fan are designed and the temperature field distribution of the optimized motor is simulated.The results show that the designed motor can meet the requirements of safe and stable operation.A high power density PMSM with rated power of 10 kW,rated speed of 9000 rpm and rated power density of 5.85kW/kg is designed.The prototype of the designed motor is manufactured and verified by experiments.The cogging torque,no-load back-EMF and inductance of the prototype are measured and compared with the simulation results.Theoretical analysis results are in good agreement with the experimental ones.