磁悬浮支承的温度场理论分析与实验验证

发布时间：2018-06-12 23:37

本文选题：磁悬浮 + 磁力轴承　；参考：《武汉理工大学》2011年硕士论文

【摘要】：随着计算机技术、自动控制技术、微电子技术的飞速发展,磁悬浮支承技术的应用越来越广泛,尤其是磁悬浮支承典型结构磁力轴承的应用。目前在磁力轴承的研究中存在一个突出的问题,即磁力轴承在高速旋转时,转子会出现严重的温升现象,这对转子精度及长时间正常运转都会产生影响,本文主要是针对这一问题展开的温度场研究。本文对温度场的原理及各种传热机制做了简要介绍,总结了目前国内外温度场研究的成果,分析了磁力轴承温度场研究的原因和意义。本文通过理论计算寻求磁力轴承的温度场边界条件,采用有限元法对轴向磁力轴承和径向磁力轴承的温度分布进行了计算和分析,并分析了其温度分布的原因。文中对单个线圈,在其偏置电流和频率不变的情况下,改变其控制电流的幅值,通过实验比较,得出控制电流的幅值是影响线圈总损耗的因素之一。此外,在相同的条件下输入正弦波、方波和三角波电压,通过实验得出,在同一个磁通密度幅值的情况下,方波供电产生的损耗最大,正弦波最小。此外,本文对磁悬浮直线支承的典型结构即磁悬浮飞车进行了分析与实验验证。磁悬浮飞车是本课题组利用机械原理和磁场向心效应,以两自由度简化悬浮原理,以最接近单个磁力轴承的工作状态,研发出的两自由度主动控制磁悬浮直线支承实验装置。本文首先利用有限元商业软件ANSYS对其进行温度场的模拟分析,然后用武汉华中数控股份有限公司的HY-2988G红外热像仪来测量磁悬浮飞车的温度场分布,并通过对磁悬浮飞车不断加载,改变其控制电流的方式来测量其在不同控制电流状态下的温度分布状况,从而为磁悬浮飞车的进一步优化提供理论基础。本文通过对实验结果的分析,提出控制电流幅值及不同波形的电压都会影响磁力轴承损耗,同时通过理论将磁滞损耗与涡流损耗计算进行分离,但是其实验分离还有待进一步的研究。
[Abstract]:With the rapid development of computer technology, automatic control technology and microelectronic technology, the application of magnetic suspension support technology is more and more extensive, especially the application of magnetic bearing with typical structure. At present, there is a prominent problem in the research of magnetic bearing, that is, when the magnetic bearing rotates at high speed, the rotor will have a serious temperature rise phenomenon, which will have an impact on the rotor precision and the normal operation for a long time. In this paper, the temperature field of this problem is studied. In this paper, the principle of temperature field and various heat transfer mechanisms are briefly introduced. The research results of temperature field at home and abroad are summarized, and the reasons and significance of the research on temperature field of magnetic bearing are analyzed. In this paper, the temperature distribution of axial magnetic bearing and radial magnetic bearing is calculated and analyzed by using finite element method, and the reason of temperature distribution is analyzed. In this paper, when the bias current and frequency of a single coil are not changed, the amplitude of the control current is changed. Through experimental comparison, it is concluded that the amplitude of the control current is one of the factors affecting the total loss of the coil. In addition, under the same conditions, sinusoidal wave, square wave and triangle wave voltage are input. The experimental results show that under the same magnetic flux density amplitude, the power loss produced by square wave is the largest and the sine wave is the smallest. In addition, the typical structure of maglev linear support, maglev flying vehicle, is analyzed and verified by experiments. The maglev flying vehicle is a two-degree-of-freedom active control magnetic suspension linear support device developed by our team, which utilizes the mechanical principle and the magnetic field concentric effect, simplifies the levitation principle with two degrees of freedom, and is closest to the working state of a single magnetic bearing. In this paper, the finite element commercial software ANSYS is used to simulate and analyze the temperature field, and then the HY-2988G infrared thermal imager of Wuhan Huazhong CNC Co., Ltd. is used to measure the temperature field distribution of the maglev flying vehicle. The temperature distribution of the maglev flying vehicle under different control current states is measured by changing its control current by loading continuously, which provides a theoretical basis for the further optimization of the maglev flying vehicle. Based on the analysis of the experimental results, it is proposed that the magnetic bearing loss will be affected by the amplitude of the control current and the voltage of different waveforms. At the same time, the hysteresis loss is separated from the eddy current loss calculation by the theory. But its experimental separation still needs further research.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.3

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