摘要
以一台额定功率70 kW的车用水冷永磁同步电机作为研究对象,分析了电机的损耗来源,并基于流体力学与传热理论建立了电机的热模型.在处理仿真模型时对绕组及气隙域进行了等效处理,考虑了铁芯导热系数的各向异性,并使用STAR-CCM+软件仿真获取得到电机在额定工况下的温度分布.通过在轴向水道内壁增加凸起特征对冷却水道结构进行优化,对优化后水道模型进行了仿真分析,仿真结果显示优化后的水道模型具有更好的散热效果.最后,在电机测试台架上对优化水道后的电机进行了温升测试,将测试数据与仿真数据进行对比,对比结果显示绕组温度两者几乎一致,永磁体温度偏差2.95%,这表明了仿真结果的准确性.
Abstract
Taking a water-cooled permanent magnet synchronous motor with a rated power of 70 kW as the research object,the sources of motor losses are analyzed,and a thermal model of the motor is established based on fluid mechanics and heat transfer theory.The winding and air gap do-main are equivalently processed in the simulation model,considering the anisotropy of the iron core thermal conductivity,while the STAR-CCM+ software is used to simulate and obtain the temperature distribution of the motor under rated operating conditions.By adding protrusions on the inner wall of the axial water channel to optimize the cooling water channel structure,the optimized water channel model is simulated and analyzed.The simulation results show that the optimized water channel model has better heat dissipation effect.Lastly,the motor with the optimized water channel is evaluated on a motor test bench to measure the temperature rise.The test data is compared with the simulation data,and the comparison results show that the winding temperatures are almost identical,with a deviation of 2.95%for the permanent magnet temperature,indicating the accuracy of the simulation results.
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