The Effect of Gap-Size on A Multi-Pole Bi-Layer Magnetorheological Brake Torque


Hoang Quang Tuan†‡, Nguyen Xuan Khoa‡, Trinh Minh Hoang†*


†Ha Noi University of Science and Technology
‡Ha Noi University of Industry

*Corresponding author: [email protected]

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

In this research, A Multi-Pole Bi-Layer Magnetorheological Brake has investigated the effect of the different gap-size Magnetorheological Fluid on the braking torque. The first, a Multi-Pole Bi-Layer Magnetorheological Brake (MPBL MRB) is designed with six poles and dual MRFs (inner and outer MRF). Next, the proposed MRB is conducted by magnetostatic simulation on Flux software with different sizes of fluid gap (from 0.5mm to 1mm). Simulated results show that the braking torque increases with the increase in the current and considered effect of the fluid gap on the braking performance. The configuration of the proposed MRB is presented and its braking torque is derived based on the Bingham Rheological model of MRF. In the results, the braking torque obtained 19.53 N.m with 0.5 mm and reduced to 12.07 N.m at 1 mm gap fluid. This shows that the smaller the gap-size, the larger the torque can be generated, but due to many factors such as machining technology and torque requirement. In addition, if the gap is too small, the MRF layer has no meaning while generating braking torque. The magnetic field can run through the MR fluid. In this study, the main contribution is the importance of gap-size to improve the design of the MRB and calculate the braking torque at each MRB structure with different gap-size.