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.
Highlights
Magnetorheological (MR) fluid, which consists of carbonyl iron powder and carrier liquid, is a sort of intelligent industrial material [1]
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
When the magnetic field acts on the MR brake, the output braking torque mainly includes the magnetic torque generated by the yield shear stress τ(B) and the viscous torque produced by the viscosity of the MR fluid
Summary
Magnetorheological (MR) fluid, which consists of carbonyl iron powder and carrier liquid, is a sort of intelligent industrial material [1]. The above methods to improve braking performance mainly increase the shear yield stress of the working area by improving the MR fluid characteristics and increasing the effective damping gap length. Shiao et al designed a new multipole bilayer MR brake with multiple electromagnetic poles and multiple layers of MR fluid [31,32] The characteristic of this structural design is that a plurality of excitation coils is uniformly arranged along the circumference, which can generate multiple magnetic poles, and effectively utilize the magnetic flux lines of the rotor surface. The appropriate structure or improvement of MR fluid can enhance the braking performance, solve the problem of low output torque, and broaden the application fields of the MR brake. MR brake, judge whether the braking torque can meet the expected design goal, and investigate the characteristics of braking performance, the prototype of the MR brake is fabricated, and the torque performance test is carried out
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
