大功率九相变频异步电机通风系统热流耦合仿真分析

为了有效解决大功率低速异步电机通风散热难题,基于热流耦合仿真分析计算方法,以1台2 800 kW、8极九相变频异步电机为例,系统分析了顶吸式强迫风冷电机内定子齿压板宽度距离对电机内风量分配、绕组温升分布以及内部风阻特性的影响,并筛选了匹配方案；同时,对比分析了九相减薄绝缘结构与三相高压绝缘结构的换热性能。最后,进行了电机的温升试验测试,温度场计算值与试验结果基本吻合,验证了基于热流耦合仿真分析计算的准确性和有效性。

Simulation Analysis of Heat Flow Coupling in the Ventilation System ofHighPower NinePhase Variable Frequency Asynchronous Motor

In order to solve the ventilation and heat dissipation problem of highpower and lowspeed asynchronous motor effectively, based on the heat flow coupling simulation analysis and calculation method, a 2 800 kW and 8pole ninephase asynchronous motor was taken as an example to analyze the distribution of air and temperature rise distribution in the motor with the width distance of the stator tooth platen of the top suction forced aircooled motor. As well as the influence of internal wind resistance characteristics, the matching scheme was screened. At the same time, the heat transfer characteristics of the ninephase subtracted thin insulating structure and the threephase high voltage insulation structure were compared and analyzed. Finally, the motor temperature rise experiment test was carried out, the temperature field calculation results were in good agreement with the test results, verifying the analysis and calculation of the accuracy and effectiveness of the simulation based on heat flow coupling.