永磁涡流传动装置散热系统分析及优化

发布时间：2018-05-31 18:38

本文选题：永磁涡流传动 + 弧形肋片　；参考：《安徽理工大学》2017年硕士论文

【摘要】：永磁涡流传动装置在工作过程中由于涡流而产生热量,热量的积聚会导致导体盘温度升高,对于矿井下工作安全性有很大威胁,且由于主从动盘工作气隙小,积聚的温度通过热对流传递给永磁体,而导致永磁体温度升高退磁失效。除了风冷、水冷、油冷等强迫对流方式以外,肋片散热器是永磁涡流传动装置广泛采用的有效散热一种方式,而肋片散热器由于性能稳定、散热性能好且花费低而倍受欢迎。以前的大量研究主要集中在水平放置,强迫对流的矩形直肋散热片,弧肋的散热面积更大,散热效果更好,本文的工作对此进行了扩展和深入探究,讨论和分析了自然对流状态下竖直均布在导体盘上的弧形散热片布置位置和尺寸的大小对于散热性能的影响。并用ANSYS仿真分析,最后通过实验验证。采用最小熵产理论,进行公式推导与计算,提出了对散热片的机构几何尺寸中肋片高度H,起终止点与导体盘心连线的夹角α,起终止点连线作为弦长的肋弧所对应的圆心角β,肋片前后两平行弧面间距s,肋片个数n作为热阻的自变量,熵产率Q为目标函数进行分析设计。先利用实验台常量参数计算出导体铜盘的温度作为热源,然后利用MATLAB进行最优化参数设计,计算出合理设计尺寸范围内弧形肋片在最佳散热性能阻情况下所对应的设计尺寸,再结合实际工况改善进行SolidWorks建模,利用Fluent的流固耦合模块进行有限元仿真,验证分析在弧形肋片最优设计情况下的散热效果、安全性以及永磁体的工作最高温度。此外,在MATLAB分析时,本文还就各变量尺寸与散热性能的相关性的变化趋势进行了分析与说明,为实际工况下兼顾性价比时,弧形肋片尺寸与布置的选择提供了理论依据;在Fluent分析时,加入了温度场分析,为额外设置流体冷却系辅助散热提供了尺寸及布置位置的依据。最后,作为验证数值模拟结果正确性的手段,本文给出相应的实验设计方案,并对后续研究工作提出了建议。对于永磁涡流传动装置大功率情况下的不规则散热片,以最小热源为指导思想进行最优化散热的研究设计,提出了 MATLAB参数优化及相关性分析、Fluent流固耦合分析与实验台验证相结合的优化方式,为其他辅助散热系的设计提供了一定的理论依据,为弧形散热片在矿井下的永磁涡流传动装置散热系统中的推广应用,以及保证更大功率的磁力软启动的安全性和可靠性提供了实验设计基础。
[Abstract]:In the working process of permanent magnet eddy current transmission device, heat is produced because of eddy current, and the accumulation of heat will cause the temperature of conductor disk to rise, which is a great threat to the working safety under mine, and because of the small air gap of main follower disk, The accumulated temperature is transferred to the permanent magnet by heat convection, which results in the demagnetization failure of the permanent magnet. In addition to forced convection modes such as air cooling, water cooling and oil cooling, fin radiators are widely used in permanent magnet eddy current transmission devices, and fin radiators are popular because of their stable performance, good heat dissipation performance and low cost. Many previous studies focused on horizontal placement, forced convection of rectangular straight ribbed radiators, arc ribbed heat dissipation area is larger, heat dissipation effect is better, the work of this paper has carried on the expansion and the thorough exploration. The influence of the position and size of the radial radiator arranged on the conductor disk under the natural convection state is discussed and analyzed. And ANSYS simulation analysis, finally through the experimental verification. Based on the theory of minimum entropy production, the formula is derived and calculated. The geometric dimension of the radiator, the height of the fin, the angle 伪 between the starting point and the conductor disc, the circle angle 尾 corresponding to the rib arc of the chord length, the distance between the two parallel arcs before and after the fin, the rib plate, the angle between the two parallel arcs before and after the fin, and the angle 伪 between the starting and ending points as the rib arc of chord length are proposed. The number n is the independent variable of thermal resistance, Entropy yield Q is the objective function to analyze and design. The temperature of the conductor copper disk is calculated as the heat source by using the constant parameters of the test table, and then the optimum parameter design is carried out by using MATLAB, and the corresponding design size of the arc rib is calculated under the condition of the optimum heat dissipation performance in the reasonable design size range. Then the SolidWorks model is built with the improvement of actual working conditions, and the finite element simulation is carried out by using the fluid-solid coupling module of Fluent to verify and analyze the heat dissipation effect, safety and the working maximum temperature of the permanent magnet under the optimal design condition of the arc rib. In addition, in the MATLAB analysis, this paper also analyzes and explains the variation trend of the correlation between the variable size and the heat dissipation performance, which provides a theoretical basis for the selection of the size and arrangement of the arc rib when the performance / price ratio is taken into account in the actual working conditions. The temperature field analysis is added to the Fluent analysis, which provides the basis of the size and the arrangement position for the additional heat dissipation of the fluid cooling system. Finally, as a means to verify the correctness of the numerical simulation results, this paper gives the corresponding experimental design scheme, and puts forward some suggestions for further research work. For the irregular heat sink of the permanent magnet eddy current drive under the condition of high power, the research and design of the optimal heat dissipation is carried out with the minimum heat source as the guiding principle. The optimization method of MATLAB parameter optimization and correlation analysis is put forward, which combines fluent fluid-solid coupling analysis with test bench verification, which provides a certain theoretical basis for the design of other auxiliary heat dissipation systems. It provides the experimental design basis for the application of arc radiator in the heat dissipation system of permanent magnet eddy current drive under mine, and for ensuring the safety and reliability of more powerful magnetic soft start.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH139

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