电工技术学报2026，Vol.41Issue(4)：1127-1141,15.DOI:10.19595/j.cnki.1000-6753.tces.250246
飞机大功率高功率密度永磁推进电机权衡优化与多物理场分析
Tradeoff Optimization and Multi-Physics Analysis of High-Power and High-Power-Density Permanent Magnet Propulsion Motors for Aircraft Electric Propulsion
摘要
Abstract
The high-power,high-power-density permanent magnet propulsion motor is a critical component of the aircraft electric propulsion system in the future.It is also a crucial challenge for enabling medium-or large-scale electric propulsion aircraft.In recent years,many institutions have conducted extensive research on medium-and low-power permanent magnet propulsion motors across various application scenarios,but studies on high-power permanent magnet propulsion motors remain relatively scarce.Therefore,this paper presents the trade-off design optimization and analysis of high-power-density permanent magnet propulsion motors in the hundred-kilowatt and megawatt classes. First,based on the load characteristics of the aircraft's electric propulsion system,the trade-off design rules for the key parameters of high-power propulsion motors are generalized.Achieving high power density in propulsion motors requires both high speed and high torque density.However,these objectives are constrained by loss suppression,thermal management,structural strength,and control stability,resulting in inherent design trade-offs.Thus,overall designs for hundred-kilowatt-and megawatt-class high-power-density propulsion motors are conducted. Secondly,to meet the requirements for high power density,efficiency,and reliability of propulsion motors,the reconfiguration mechanism of phase-shifted multiple three-phase windings and the topology of multi-segment Halbach-array permanent magnets are investigated using analytical and finite-element simulation methods.Then,the power density of the propulsion motor is ultimately improved through genetic-algorithm multi-objective optimization. Moreover,the electromagnetic and mechanical strength characteristics are analyzed,demonstrating the excellent output performance and high-speed operational capability of the propulsion motors.A comparative analysis of unidirectional and bidirectional oil-immersed cooling systems shows that the unidirectional system adequately meets the efficient cooling requirements of hundred-kilowatt-class motors under high current density.In contrast,the bidirectional system can further reduce temperature rise,particularly for high-speed,high-power motors with high loss density and slender geometries. Finally,electromagnetic and thermal experiments are conducted on a prototype of a 110 kW permanent magnet propulsion motor,providing a reference for the development and verification of future megawatt-class permanent magnet propulsion motors. The following conclusions can be drawn.(1)The phase-shifted multi-three-phase winding configuration can increase the output torque of the propulsion motor by 4.9%,while suppressing torque ripple,enhancing redundancy,and simplifying the end structure.(2)Multi-segment Halbach array permanent magnets are beneficial for improving torque density and magnetic field sinusoidality.However,excessive segmentation yields limited additional benefits and increases manufacturing complexity and cost,necessitating a trade-off in selection.(3)Compared with hundred-kilowatt-class motors,megawatt-class propulsion motors require higher rotor tip speeds,fundamental frequencies,and current densities,which place greater demands on structural strength and thermal management.(4)After optimization,the power density of the megawatt-class motor is expected to reach 17.3 kW/kg with an efficiency of 98.2%.(5)Stator sealed oil-immersed cooling allows for high current densities of up to 25 A/mm2,and the bidirectional oil channel system can further reduce temperature rise compared to the unidirectional system.关键词
电推进飞机/推进电机/永磁同步电机/大功率/高功率密度Key words
Electric propulsion aircraft/propulsion motor/permanent magnet synchronous motor(PMSM)/high power/high power density分类
信息技术与安全科学引用本文复制引用
薛涵,张卓然,林秋雨,刘业,陆嘉伟..飞机大功率高功率密度永磁推进电机权衡优化与多物理场分析[J].电工技术学报,2026,41(4):1127-1141,15.基金项目
国家自然科学基金"叶企孙"联合基金重点项目(U2141223)、江苏省研究生科研与实践创新计划项目(KYCX24_0574)和南京航空航天大学博士学位论文创新与创优基金项目(BCXJ24-08)资助. （U2141223）
