An Electrodynamic/Magnetorheological Clutch Powered by Permanent Magnets
An Electrodynamic/Magnetorheological Clutch Powered by Permanent Magnets
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DOI：
10.1109/tmag.2016.2628822
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发表时间：
2017-02
影响因子：
2.1
通讯作者：
R. Rizzo;A. Musolino;H. C. Lai
中科院分区：
文献类型：
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作者：
R. Rizzo;A. Musolino;H. C. Lai
本文提出了一种基于电动/磁流变液（MRF）的离合器，使用附加到一个轴上的永磁体（PMs）激活。在机电瞬态阶段期间，当两个离合器轴以不同的速度旋转时，PM在策略性地放置在系统中的一些导电材料上感生涡电流。这些电流和磁感应之间的相互作用产生电磁扭矩，该电磁扭矩被添加到MRF的电磁扭矩，当需要额外的扭矩来克服可能的静摩擦时，帮助离合器在启动阶段接合。一旦两个轴达到相同的速度，涡电流（以及因此产生的电磁转矩）消失，转矩传递仅由磁流变液保证。导电材料被布置为铜片，并研究了器件的性能。使用3-D有限元代码分析所提出的离合器，该代码考虑非线性材料的$B$ - $H$曲线（例如，磁流变液，永磁体和铁磁材料）和不同部件的运动。最后，为了验证有限元模型，在原型上进行了一些实验测量。
This paper presents an electrodynamic/magnetorheological fluid (MRF)-based clutch activated using permanent magnets (PMs) attached to one shaft. During the electro-mechanical transient phase, when the two clutch shafts rotate at different speed, the PMs induce eddy currents on some conductive materials strategically placed in the system. The interaction between these currents and the magnetic induction produces an electromagnetic torque, which is added to that of the MRF, helping the clutch engagement in the start-up phase when an extra torque is necessary to overcome possible static frictions. Once the two shafts have reached the same speed, the eddy currents (and, consequently, the electromagnetic torque) vanish and the torque transmission is assured by the MRF only. The conductive material is arranged as a copper sheet and the performance of the device is investigated. The proposed clutch is analyzed using a 3-D finite-element code, which considers the $B$ – $H$ curve of the nonlinear materials (e.g., MRF, PMs, and ferromagnetic materials) and the movement of the different parts. Finally, in order to verify the finite element method model, some experimental measurements are performed on a prototype.