Heat Transfer Analysis of Giant Magnetostrictive Actuator with Inner Tube and Outer Cavity
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摘要: 为了降低温升对超磁致伸缩致动器工作性能的影响,提出了一种采用内管外腔式的超磁致伸缩致动器水冷结构。基于热阻定律建立其传热模型,分析了影响超磁致伸缩材料棒温度的因素,对超磁致伸缩致动器稳态时的温度进行了仿真分析。结果表明,虽然超磁致伸缩致动器的温度随着电流强度的增大而升高,但是采用强制水冷可以有效地控制温升,且温升随着冷却水入口流速的增大而减小,当冷却水入口流速为3 m/s时,超磁致伸缩材料棒的热变形量不大于0.09 μm。Abstract: In order to reduce the influence of temperature rise on the performance of the giant magnetostrictive actuator (GMA), a water-cooled system structure of the giant magnetostrictive actuator with inner tube and outer cavity was proposed and designed in this paper. The heat transfer model of GMA with water-cooled system was established based on the thermal resistance law, and the factors influencing the temperature of the giant magnetostrictive material rod were analyzed, and the steady state temperature field of the giant magnetostrictive actuator is simulated and analyzed. The results show that although the temperature of the giant magnetostrictive actuator will increase with the increase of current intensity, the use of forced water cooling system can effectively control the temperature rise, and the temperature rise decreases with the increase of the cooling water inlet flow rate. When the inlet velocity of cooling water is 3 m/s, the thermal deformation of the giant magnetostrictive material rod is no more than 0.09 μm.
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表 1 GMA结构参数表
参数 材料 轴向尺寸/
mm径向尺寸/m 内径 外径 GMM棒 Terfenol-D LG = 50 − 8 铜管 铜 − 2 4 线圈 铜 LC = 51 24 40 线圈骨架 尼龙 Lf = 51 16 24 冷却腔骨架 45钢 Lq = 60 40 45 套筒 45钢 Lt = 60 60 86 前、后导磁端盖 DT4 Ld = 12 − 86 表 2 线圈电流大小与产热功率表
电流/A 1 2 3 4 5 6 功率/W 0.9 3.6 8.1 14.4 22.5 32.4 表 3 两种入口流速下GMA温度比较表
部件 GMM棒 线圈骨架 线圈 冷却
腔骨架套筒 自然对流(1 A) 28.71 28.74 28.77 28.73 28.68 自然对流(6 A) 118.88 119.77 120.64 119.63 118.26 强制对流(1 A) 25.03 25.10 25.14 25.12 25.10 强制对流(6 A) 26.12 28.62 29.85 29.09 28.33 -
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