大型感应交流电机内冷却扇改型优化分析  

Optimization Analysis of Internal Cooling Fan for Large Induction AC Motor

作　　者：晋社民 郭瑞 杨瑞[2] 吴卓琦[2] JIN She-min;GUO Rui;YANG Rui;WU Zhuo-qi(Lanzhou Electric Machine Limited Company,Gansu Lanzhou730050,China;Energy and Power Engineering College of Lanzhou University of Technology,Gansu Lanzhou730050,China)

机构地区：[1]兰州电机股份有限公司,甘肃兰州730050 [2]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《机械设计与制造》2020年第7期179-182,共4页Machinery Design & Manufacture

基　　金：国家国际科技合作专项项目(2014DFR60990);甘肃省科技重大专项项目(17ZD2GA006)。

摘　　要：通过ANSYS软件中Fluent模块,对某6.3MW大型感应交流发电机流体场及温度场进行模拟分析。模拟结果显示使用蜗壳式直叶片内冷却扇的原电机冷却系统,电机腔体内冷却空气流动易受电机流道结构及绕组部件阻挡,使得冷却系统出现通风量偏小,零部件换热效率较低等问题。基于降低电机轴消耗功率及提高冷却系统换热效率的优化思路,提出使用轴流式内冷却扇的冷却系统。通过对比分析优化前、后的系统内冷却扇效率、系统通风量、主要发热部件温度分布及内冷却扇局部区域流场等计算数据,得出使用轴流式内冷却扇的冷却系统更符合该电机的流道结构并具有更优的换热性能。The fluent module of ANSYS software is used to simulate the fluid field and temperature field of a 6.3MW large induction alternator.The simulation results show that the volute straight internal fan cooling system makes cooling air flow in the motor cavity is easily blocked by the structure of the motor channel and the winding components,which makes the cooling system less ventilated and the heat transfer efficiency of the parts is low.Based on the optimization idea of reducing the power consumption of motor shaft and improving the heat exchange efficiency of cooling system,the axial flow internal fan cooling system is put forward.Through the comparative analysis before and after optimization in the system within the cooling fan efficiency,ventilation rate,temperature distribution and cooling fan inside main heating parts local flow field calculation data.It is concluded that the cooling system using axial flow internal cooling fan is more consistent with the runner structure of the motor and has better heat transfer performance.

关 键 词：感应交流电机 冷却系统 数值模拟 内冷却扇 蜗壳式内冷却扇 轴流式内冷却扇 

分 类 号：TH16[机械工程—机械制造及自动化] TK83[动力工程及工程热物理—流体机械及工程]