基于不同绕组类型的航空永磁电机电磁损耗与热特性研究

Research on Electromagnetic Loss and Thermal Characteristics of Permanent Magnet Motors with Different Winding Types for Aircraft Application

高功率密度永磁电机是航空电推进系统的动力核心,但在高频高电磁负荷条件下其损耗与发热问题突出,特别是定子槽内绕组温升直接影响航空电推进永磁电机安全稳定运行。本文聚焦航空电推进永磁电机利兹线和扁线绕组损耗机理与电机热特性开展研究,考虑不同转速下的交流损耗,建立定子循油转子通风冷却条件永磁电机温度场仿真模型,对比分析基于不同绕组类型的永磁电机发热特性,获得绕组损耗和温升随工作频率的表征规律,为高功率密度永磁电机绕组设计提供理论和技术支撑。

High power density permanent magnet motor is the core component of electric aircraft propulsion system,but it faces problems of loss and heating under high frequency operation and high electromagnetic load,especially the temperature rise characteristic of winding directly affects the safety of the permanent magnet motor.This paper focuses on the research on the winding loss mechanism of Litz and flat wires of permanent magnet motor for aircraft application.Considering the AC loss characteristics at different speeds,the temperature field model of permanent magnet motor cooled by stator oil and rotor ventilation is established.The thermal characteristics of permanent magnet motor based on different winding types are compared and analyzed,and the characteristics of winding loss and thermal with operating frequency are obtained.It provides theoretical and technical support for winding design of high power density permanent magnet motor.