Wu Jie, Liu Yuhang, Xie Hongyang
Hubei Agricultural Machinery Institute, Hubei University of Technology, Wuhan 430068, China.
Institute of Modern Agricultural Equipment, Xihua University, Chengdu 610039, China.
Rev Sci Instrum. 2024 Mar 1;95(3). doi: 10.1063/5.0190682.
Thermal characteristics have a profound effect on the allowable slip power and torque transmission stability of magnetorheological (MR) fluid devices. This paper investigates the thermal properties of a multi-pole MR clutch under different heat dissipation methods. First, the structure of the clutch is described, and heat generation and heat dissipation of the designed clutch are studied theoretically. Then, a numerical model is established, and several simulations are conducted on steady-state and transient temperatures under various operation conditions. After that, a temperature testing platform for the MR clutch is built, and several temperature experiments are carried out. The results show that the allowable steady-state slip power of the clutch under natural air cooling is about 147 W. Under forced air cooling, the allowable steady-state slip powers are 1.295, 1.555, and 1.790 kW, respectively, when the wind speeds are 3.5, 7.0, and 10.5 m/s. Furthermore, it turned out that the transmission torque of the MR clutch decreases with the increase in temperature. The experimental and simulated values of temperature are in good agreement in terms of numerical values and trends, indicating that the established temperature field simulation model can better reflect the temperature characteristics of the actual operation of the proposed multi-pole MR clutch. This research achievement can provide support for research on heat dissipation technology for MR devices with multiple excitation sources.
热特性对磁流变（MR）流体装置的允许滑差功率和扭矩传递稳定性有着深远影响。本文研究了多极MR离合器在不同散热方式下的热性能。首先，描述了离合器的结构，并从理论上研究了所设计离合器的发热和散热情况。然后，建立了一个数值模型，并在各种运行条件下对稳态和瞬态温度进行了若干模拟。之后，搭建了一个用于MR离合器的温度测试平台，并进行了若干温度实验。结果表明，在自然风冷条件下，离合器的允许稳态滑差功率约为147W。在强制风冷条件下，当风速分别为3.5、7.0和10.5m/s时，允许稳态滑差功率分别为1.295、1.555和1.790kW。此外，结果还表明，MR离合器的传递扭矩随温度升高而降低。温度的实验值和模拟值在数值和趋势方面吻合良好，表明所建立的温度场模拟模型能够较好地反映所提出的多极MR离合器实际运行时的温度特性。这一研究成果可为多激励源MR装置散热技术的研究提供支持。
