Torque Characteristics Analysis of a Magnetorheological Brake with Double Brake Disc

Abstract

Magnetorheological (MR) brake is a sort of electromagnetic brake that uses the controllable output characteristics of MR fluid for braking. In this paper, an MR brake with a double brake disc was developed to improve the braking performance of conventional MR brakes. The effective damping gaps were increased from the traditional two sections to four sections by increasing the single brake disc of the conventional MR brake to a double brake disc. By reasonably arranging the non-magnetic sleeve inside the MR brake, the magnetic flux lines were better guided to the effective damping gaps, which increased the utilization rate of the magnetic field, effectively enhanced the braking performance, and also reduced the braking power consumption. The structure and working principle of the MR brake with double brake disc were discussed. The magnetic field of the proposed MR brake was analyzed by ANSYS software, and the theoretical result of braking performance was obtained by combining the established mechanical model. The braking performance test rig was setup to investigate the torque performance of the MR brake. The experimental results show that the maximum braking torque is 18.01 N·m at the applied current of 2.0 A and the rotational speed of 400 r·min−1, and the simulation values are basically verified. In addition, the results indicate that the constant torque characteristic of the MR brake is relatively stable, and the torque is almost unaffected by the changes of rotational speed. The results can provide some guidance for the structural design and optimization of the MR actuators.

Magnetically-Induced Pressure Generation in Magnetorheological Fluids under the Influence of Magnetic Fields

“…Various every day devices, such as shock absorbers [8,9], brakes [10,11], clutches [12], earthquake dampers [13,14], control valves [15,16], mounts [17][18][19], thermal energy transfers [20], biomedical applications [21], precision polishing [22], and sound propagation devices [23,24], are made possible due to the properties of these smart materials. Based on the studies above, it is evident that MRFs are mostly used in energy dissipating devices and not in an active energy actuating device due to its operational modes.…”

Coupled Field Analysis of Phenomena in Hybrid Excited Magnetorheological Fluid Brake

“…So far, a comprehensive approach to the problem of solving time-dependent coupled field phenomena in MR devices has not yet been the subject of research discussed in the open literature. It can be observed that in the research area subjected to the analysis of MR transducers, the field approach is applied only for selected phenomena (for example, electromagnetic), while simplified models of fluid dynamics or temperature fields are incorporated [ 9 , 17 , 20 , 24 , 34 ].…”

Design and performance evaluation of a multi-disc magnetorheological fluid brake for A00-class minicars

“…The results confirmed that the gap size significantly influences the braking performance. Hu et al (2021) and Shiao et al (2021) conducted a related study on multi-disc MRB, and the results indicated that the braking performance of the MRB can be improved by increasing the number of brake discs. In the follow-up research, Shiao and Kantipudi (2022) proposed an MRB which adopted dual disc-type construction to achieve high torque density.…”