Magnetorheological (MR) fluids change their flow resistance on the application of magnetic field. This variation in resistance to shear, offered by MR fluid, is rapid and almost completely reversible (no hysteresis). This unique feature has motivated authors to design a variable resistance brake using MR fluid. The present paper describes the design procedure of MR brake and discusses the effect of MR gap on its braking torque. Two brakes, Brake 1 with MR gap 1 mm and Brake 2 with MR gap 2 mm have been designed and fabricated. To generate magnetic field one central electro-magnet and two side electromagnets have been suggested. To validate the theoretical design and its findings, prototyping, and experimental study of MR brake have been performed. Vibrating sample magnetometer test has been carried out to obtain magnetic properties of the MR fluid and its magnetic phase. An experimental test setup has been developed to measure the braking torque under various operating speeds (200 to 1200 r/min) and control currents (0.0 to 1.2 A). The effects of central and side electromagnets on braking torque have been examined. The observed results are presented in tabular and graphical form. A close agreement between theoretical and experimental results has been noticed.
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机译：磁流变（MR）流体会在磁场作用下改变其流阻。 MR流体提供的这种抗剪切力变化迅速且几乎完全可逆（无磁滞）。这一独特功能促使作者设计出使用MR流体的可变电阻制动器。本文介绍了MR制动器的设计过程，并讨论了MR间隙对其制动扭矩的影响。已经设计并制造了两个制动器，MR间隙为1 mm的制动器1和MR间隙为2 mm的制动器2。为了产生磁场，已经提出了一个中央电磁体和两个侧面电磁体。为了验证理论设计及其发现，已进行了MR制动器的原型设计和实验研究。已经进行了振动样品磁力计测试以获得MR流体及其磁相的磁性。已经开发出实验测试装置，以测量各种运行速度（200至1200 r / min）和控制电流（0.0至1.2 A）下的制动扭矩。已经检查了中央和侧面电磁体对制动扭矩的影响。观察到的结果以表格和图形形式呈现。已经注意到理论和实验结果之间的紧密一致性。
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