Design, Analysis and Electromagnetic Simulation of a Multi-Disc Automotive Magnetorheological Brake

Abstract

In order to further improve the safety and reliability of automotive braking system, this study proposes a multi-disc magnetorheological brake (MRB) and the characteristics of its output braking torque are analyzed. In this paper, firstly, the output braking torque of multi-disc MRB is modeled theoretically. Then, the structural model of the MRB is designed and presented. After these, the curve of the relation between coil current and braking torque is obtained and polynomial fitting is carried out by matlab/simulink. Finally, the magnetic circuit of the MRB and the magnetic flux density at the working gap of the MRB are verified by finite element electromagnetic simulation. The results indicate that the MRB can satisfy the requirement of maximum braking torque and still have a margin at the same time. In addition, the coil current and braking torque show a good linear relationship in a certain extent and range, which is conducive to the development of linear control system.