车用永磁同步电机铸铝合金机壳热疲劳寿命预测  

Thermal fatigue life prediction of cast aluminum alloy casing of vehicle permanent magnet synchronous motors

作　　者：何联格 袁洲 石文军 HE Liange;YUAN Zhou;SHI Wenjun(Key Laboratory of Advanced Manufacturing Technology for Automobile Parts,Ministry of education,Chongqing University of Technology,Chongqing 400054,China;Key Laboratory of Modern Measurement and Control Technology,Ministry of Education,Beijing Information Science and Technology University,Beijing 100192,China;Chongqing Tsingshan Industrial Co.,Ltd.,Chongqing 402761,China)

机构地区：[1]重庆理工大学汽车零部件先进制造技术教育部重点实验室,重庆400054 [2]北京信息科技大学现代测控技术教育部重点实验室,北京100192 [3]重庆青山工业有限责任公司,重庆402761

出　　处：《重庆理工大学学报（自然科学）》2023年第5期90-98,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0440);中国博士后基金面上资助项目(2019M663443);重庆市教育委员会科学技术研究计划青年项目(KJQN201901113);现代测控技术教育部重点实验室开放课题(KF20211123201);重庆市研究生科研创新项目(CYS22689)。

摘　　要：为了研究变工况下车用永磁同步电机温度变化对电机铸铝合金机壳的热应力和热疲劳寿命的影响,结合理论、试验与有限元仿真对机壳进行了多物理场耦合研究。首先通过试验采集了作为仿真计算边界条件的电机环境温度和作为仿真结果参考的绕组端部温度;然后通过计算得到了电机的主要损耗,基于传热学和流体力学对电机进行了简化建模和有限元仿真,得到了电机机壳的温度场分布;再通过试验得到了铸铝合金材料热疲劳寿命预测模型的基本材料参数,结合温度场结果,计算了机壳在不同温度分布下的热应力;最后得到了机壳在热应力作用下的热疲劳寿命为29673次。为电机机壳的设计优化以及材料的选择提供了一定的参考依据。In order to study the effect of temperature variation on thermal stress and thermal fatigue life of cast aluminum alloy casing of a vehicle permanent magnet synchronous motor under variable working conditions,this paper combines theories,experiments and finite element simulation to conduct a multi-physical field coupling study on the casing.Firstly,the ambient temperature of the motor as the boundary condition for simulation calculation,and the winding end temperature as the reference of the simulation results are collected experimentally.Then,the main losses of the motor are calculated,and the temperature field distribution of the motor casing is obtained through simplified modeling and finite element simulation of the motor based on heat transfer and fluid dynamics.Afterwards,basic material parameters of the thermal fatigue life prediction model of the cast aluminum alloy are obtained through the experiment.The thermal stresses of the casing under different temperature distributions are also calculated by combining the temperature field results.Finally,the thermal fatigue life of the casing under the thermal stresses is obtained as 29673 times.This study provides a certain reference basis for the design optimization of the motor casing and the selection of materials.

关 键 词：车用永磁同步电机 铸铝合金机壳 温度场 热应力 热疲劳寿命 

分 类 号：TM341[电气工程—电机] TK123[动力工程及工程热物理—工程热物理]