兆瓦级高速永磁电机新型转子冷却结构研究  

Investigation of new rotor cooling structure optimization in MW high-speed permanent magnet motor

作　　者：蔡蔚 牛金花 唐跃[1] CAI Wei;NIU Jinhua;TANG Yue(School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080

出　　处：《电机与控制学报》2024年第5期38-47,共10页Electric Machines and Control

基　　金：国家自然科学基金(U21A20145)。

摘　　要：兆瓦级高速永磁电机转子侧无强迫冷却措施时转子侧温升高、永磁体失磁风险高,基于此问题,提出一种新型的加强筋转子轴向通风结构,该结构能够提高转子侧的壁面对流散热系数、提升转子侧的散热能力、降低电机温度。以一台1 MW、18000 r/min的高速永磁电机为例,建立该电机的三维全域流固耦合求解模型,基于计算流体力学和有限元法对电机流体场与温度场进行分析,揭示电机在额定工况下的流体与温度分布规律。将新冷却结构与传统冷却结构的散热性能及温升变化进行对比,验证新型冷却结构在提升电机散热性能方面的有效性。最后,分析入口风速对电机最高温度的影响,得到适合该冷却结构的入口风速范围,为外部风压设备的选择提供理论支撑。When there is no forced cooling measures on the rotor side of the MW high-speed permanent magnet motor,the rotor side temperature rises and the risk of permanent magnet demagnetization is high.Based on this problem,a new axial ventilation structure was proposed with reinforced ribs,which can im-prove the wall heat transfer coefficient on the rotor wall,enhance the heat transfer capacity of the rotor side,and reduce the temperature of the motor.A three-dimensional global fluid-solid coupling solution model was established for a 1 MW,18000 r/min high-speed permanent magnet motor,and the fluid field and temperature field of the motor were analyzed based on computational fluid dynamics and finite ele-ment method.The distribution of fluid and temperature of the motor under rated working conditions was revealed.The heat dissipation performance and temperature rise change of the new cooling structure was compared with that of the traditional cooling structure,and feasibility of the proposed new cooling struc-ture in improving the heat dissipation performance of the motor was verified.Finally,the effect of inlet wind speed on the maximum temperature of the motor was analyzed,and the suitable inlet wind speed range for this cooling structure was obtained,providing theoretical support for the selection of external wind pressure equipment.

关 键 词：兆瓦级高速永磁电机 电机损耗 转子通风冷却 流体场 温度场 冷却结构优化 

分 类 号：TM351[电气工程—电机]