YKK系列中型高压电机流体场与温度场的计算分析

发布时间：2018-06-30 10:35

本文选题：中型高压异步电动机 + 流体场　；参考：《哈尔滨理工大学》2015年硕士论文

【摘要】：20世纪90年代，我国设计了YKK系列中型高压感应电动机，它具有高效、节能、噪声低、振动小、性能可靠等优点。它可以驱动通风机、压缩机、水泵、破碎机、切削机床等其他机械，也可以作为原动机广泛的应用于煤矿、机械工业、发电厂及各种工矿企业中。由于这种封闭式交流异步电机的结构较为复杂，故温升一直是该电机运行时需要关注的重点问题之一。 YKK系列中型高压异步电动机的冷却系统采用了轴径向混合通风的方式，在电机内部分布着径向通风沟，电机运行时旋转的转子导致通风沟内流体的流动情况非常复杂。在实际计算中，大部分人选择对通风沟内流体的流动进行简化，这种处理方法虽然便捷了计算，但得到的结果却与实际情况有比较大的偏差，大大降低了温度场计算的准确性。本文分析了YKK系列电机通风冷却系统的特点，以一台YKK450-4、500kW中型高压异步电动机为例，，依据电机实际结构的尺寸，建立了内风路流体场的物理模型；基于流体力学和传热学理论对电机的实际运行情况进行分析，给出适合的假设条件及边界条件；对电机内流体场进行仿真计算，得到了计算区域的流体场、压力分布云图及每个通风沟内的流量分布；采用流体场温度场耦合的算法对电机内部的温度场进行分析计算；重新对改变通风槽钢、通风槽管安装位置的通风沟进行建模，得到几种不同情况下电机内部的温度场分布。本文较为准确的计算出电机稳定运行时其内部的流体场与温度场的分布情况，仿真结果与实验数据的对比证明了计算模型的合理性及准确性，同时对通风槽钢的安装位置提出了改进建议，研究结果为提高电机的散热性能、优化电机的通风结构提供了理论依据。
[Abstract]:In the 1990s, YKK series medium high voltage induction motors were designed in China. It has the advantages of high efficiency, energy saving, low noise, low vibration, reliable performance and so on. It can drive fans, compressors, pumps, crushers, cutting machines and other machinery, but also can be used as prime movers in coal mines, mechanical industry, power plants and various industrial and mining enterprises. Because the structure of this closed AC asynchronous motor is more complex, Therefore, temperature rise has always been one of the most important problems in the operation of the motor. The cooling system of YKK series medium high voltage asynchronous motor adopts axial and radial mixed ventilation, and the radial ventilation ditch is distributed inside the motor. The flow of fluid in the ventilation ditch is very complicated due to the rotating rotor when the motor is running. In the actual calculation, most people choose to simplify the flow of fluid in the ventilation ditch. Although this treatment method is convenient to calculate, the results obtained are quite different from the actual situation, which greatly reduces the accuracy of the calculation of temperature field. The characteristics of ventilation cooling system of YKK series motors are analyzed in this paper. Taking a YKK 450-4500kW medium high voltage asynchronous motor as an example, the physical model of the fluid field in the inner air path is established according to the size of the actual structure of the motor. Based on the theory of fluid mechanics and heat transfer, the actual operation of the motor is analyzed, and the suitable hypothetical conditions and boundary conditions are given, the fluid field in the motor is simulated and the fluid field in the calculation area is obtained. Pressure distribution cloud diagram and flow distribution in each ventilation ditch; analysis and calculation of internal temperature field of motor using fluid field temperature field coupling algorithm; modeling of ventilation ditch with changing ventilation channel steel and installation position of ventilation groove pipe, The temperature field distribution inside the motor is obtained under several different conditions. In this paper, the distribution of fluid field and temperature field inside the motor is calculated accurately when the motor is running stably. The comparison between the simulation results and the experimental data proves the rationality and accuracy of the calculation model. At the same time, suggestions for improving the installation position of the ventilation channel steel are put forward. The research results provide a theoretical basis for improving the heat dissipation performance of the motor and optimizing the ventilation structure of the motor.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM343

【参考文献】